continued - Lochinvar
CFX-CHX-I-O Rev D
Installation & Operation Manual
Models: 402 - 2072
WARNING:
If the information in these instructions is not
followed exactly, a fire or explosion may result causing property
damage, personal injury or death.
-- Do not store or use gasoline or other flammable vapors and
liquids in the vicinity of this or any other appliance.
-- WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any phone in your
building.
• Immediately call your gas supplier from a near by phone.
Follow the gas supplier’s instructions.
• If you cannot reach your gas supplier, call the fire department.
-- Installation and service must be performed by a qualified
installer, service agency, or the gas supplier.
 WARNING:
This manual supplies information for the
installation, operation, and servicing of the
appliance. It is strongly recommended that this
manual and the Copper-fin II Service Manual be
reviewed completely before proceeding with an
installation. Perform steps in the order given.
Failure to comply could result in severe personal
injury, death, or substantial property damage.
Save this manual for future reference.
Contents
HAZARD DEFINITIONS ..................................................... 2
PLEASE READ BEFORE PROCEEDING ......................... 3
SAFETY INFORMATION ................................................... 4
THE COPPER-FIN II -- HOW IT WORKS ...................... 5-7
RATINGS ........................................................................... 8
1. DETERMINE UNIT LOCATION
Location of Unit .................................................................. 9
Recommended Service Clearances.................................. 9
Non-Combustible / Combustible Flooring ........................ 10
Combustion Air Options .............................................. 10-13
2. VENTING
Before You Begin ............................................................. 13
Vent System Options ....................................................... 14
General Venting Information ............................................ 15
Conventional Negative Draft Venting .......................... 16-18
Vertical DirectAire Venting .......................................... 19-21
Sidewall Venting .......................................................... 22-24
Horizontal DirectAire Venting ........................................... 25
Direct Venting .............................................................. 26-29
Outdoor Installation .......................................................... 30
3. GAS CONNECTIONS
Connecting to Gas Supply ............................................... 31
Gas Pressure Test ........................................................... 31
Checking Manifold Gas Pressure .................................... 31
Combination Gas Valves.................................................. 32
Checking Gas Supply Pressure ....................................... 33
4. WATER CONNECTIONS
Inlet & Outlet Connections ............................................... 34
Relief Valve ...................................................................... 35
Heating Boiler Installations.......................................... 35-36
Low Temperature Return Water Systems........................ 36
Low Temperature Bypass Requirements ......................... 36
Three Way Valves in System ........................................... 37
Radiant Floor and Snow Melt Heating Systems .............. 37
Typical Heating Boiler Installations .................................. 38
Installation with a Chilled Water System .......................... 38
Primary/Secondary Piping of a Single Boiler.............. 39
Primary/Secondary Piping of Multiple Boilers ............ 40
Boiler w/Low Temperature Bypass Piping .................. 41
Primary/Secondary Piping with Buffer Tank ............... 42
5. ELECTRICAL CONNECTIONS
Boiler Operating Control Module ...................................... 43
Line Voltage Connections ................................................ 44
Low Voltage Connections ................................................ 44
Wiring of the Cascade ...................................................... 45
Low Voltage Field Wiring Connections ............................ 46
6. STARTUP
Check/Control Water Chemistry....................................... 47
Freeze Protection (when used) ........................................ 47
Fill and Test Water System .............................................. 47
Purge Air from Water System .......................................... 47
Check for Gas Leaks ....................................................... 47
Check Thermostat Circuit(s) ............................................ 48
Check Vent and Air Piping ............................................... 48
Placing the Boiler in Operation ........................................ 48
Start the Boiler ................................................................. 48
If Boiler Does Not Start Correctly ..................................... 48
Set Space heating Operation (boiler only) ....................... 48
Operating Instructions ...................................................... 49
Set DHW Operation ......................................................... 50
7. OPERATING INFORMATION
General........................................................................ 51-53
Cascade ...................................................................... 53-54
Sequence of Operation ............................................... 55-56
Copper-fin II Control Module ............................................ 56
Access Modes ............................................................ 57
Saving Parameters ..................................................... 57
Status Display Screens ............................................... 58-61
8. DOMESTIC WATER HEATERS
Initial Setup of Maximum Water Flow .............................. 62
Water Chemistry............................................................... 63
Typical Water Heater Piping w/Storage Tank(s) ......... 64-65
Multiple Water Heater Piping w/Storage Tank(s) ........ 66-67
Pump Operation ............................................................... 68
Minimum Water Temperatures (domestic hot water) ....... 69
9. MAINTENANCE ......................................................71-75
10. CONNECTION DIAGRAM ................................... 76-77
11. LADDER DIAGRAM .............................................. 78-79
Revision Notes .................................................. Back Cover
Hazard definitions
The following defined terms are used throughout this manual to bring attention to the presence of hazards of various risk
levels or to important information concerning the life of the product.
 DANGER
DANGER indicates an imminently hazardous situation which, if not avoided, will result in death or
serious injury.
WARNING indicates a potentially hazardous situation which, if not avoided, could result in death or
 WARNING serious injury.
CAUTION indicates a potentially hazardous situation which, if not avoided, may result in minor or
 CAUTION moderate injury.
CAUTION
CAUTION used without the safety alert symbol indicates a potentially hazardous situation which, if not
avoided, may result in property damage.
NOTICE
NOTICE indicates special instructions on installation, operation, or maintenance that are important but
not related to personal injury or property damage.
2
Installation & Operation Manual
Please read before proceeding
Special instructions
NOTICE
This is a gas appliance and should be installed
by a licensed electrician and/or certified gas
supplier. Service must be performed by a
qualified service installer, service agency or
the gas supplier.
 WARNING If the information in these instructions is
not followed exactly, a fire or explosion may
result causing property damage, personal
injury, or death.

Apply enough water to the combustion chamber
lining to prevent airborne dust.
 Remove the combustion chamber lining from the
appliance and place it in a plastic bag for disposal.
• NIOSH stated First Aid:
Eye: Irrigate immediately.
Breathing: Fresh air.
 WARNING The combustion chamber insulation in this
appliance contains ceramic fiber material.
Ceramic fibers can be converted to cristobalite
in very high temperature applications.
The International Agency for Research on
Cancer (IARC) has concluded, “Crystalline
silica in the form of quartz or cristobalite
from occupational sources is carcinogenic
to humans (Group 1).” Normal operating
temperatures in this appliance are below the
level to convert ceramic fibers to cristobalite.
Abnormal operating conditions would have
to be created to convert the ceramic fibers in
this appliance to cristobalite.
This appliance MUST NOT be installed in
any location where gasoline or flammable
vapors are likely to be present, unless the
installation is such to eliminate the probable
ignition of gasoline or flammable vapors.
Improper
installation,
adjustment,
 WARNING
alteration, service or maintenance can
cause injury or property damage. Refer
to this manual for assistance or additional
information, consult a qualified installer,
service agency or the gas supplier.
Checking equipment –
Upon receiving equipment, check for signs of shipping damage.
Pay particular attention to parts accompanying the appliances
which may show signs of being hit or otherwise being
mishandled. Verify total number of pieces shown on packing
slip with those actually received. In case there is damage or a
shortage, immediately notify the carrier.
Do not use this appliance if any part has been under water.
The possible damage to a flooded appliance can be extensive
and present numerous safety hazards. Any appliance that has
been under water must be replaced.
The ceramic fiber material used in this
appliance is an irritant; when handling or
replacing the ceramic materials it is advisable
that the installer follow these safety guides.
REMOVAL OF COMBUSTION CHAMBER LINING OR
BASE PANELS:
NOTICE
 Avoid breathing
and eyes.
dust
and
contact
with
The ceramic fiber material used in this
appliance is an irritant; when handling
or replacing the ceramic materials it is
advisable that the installer follow these safety
guidelines.
Warranty –
Factory warranty (shipped with unit) does not apply to units
improperly installed or improperly operated.
Experience has shown that improper installation or system
design, rather than faulty equipment, is the cause of most
operating problems.
1.
Excessive water hardness causing a lime/scale build-up in
the copper tube is not the fault of the equipment and is
not covered under the manufacturer’s warranty (see
Water Treatment and Water Chemistry).
2.
Excessive pitting and erosion on the inside of the copper
tube may be caused by too much water velocity through
the tubes and is not covered by the manufacturer’s
warranty (see Boiler Flow Rates and Temperature Rise for
flow requirements).
skin
• Use NIOSH certified dust respirator (N95).
This type of respirator is based on the OSHA
requirements for cristobalite at the time this
document was written.
Other types of
respirators may be needed depending on the job
site conditions. Current NIOSH recommendations
can be found on the NIOSH website at
http://www.cdc.gov/niosh/homepage.html.
NIOSH approved respirators, manufacturers, and
phone numbers are also listed on this website.
• Wear long-sleeved, loose fitting clothing, gloves,
and eye protection.
3
Installation & Operation Manual
Please read before proceeding
Safety information
 Owner warning –
The information contained in this manual is intended for use
by qualified professional installers, service technicians, or gas
suppliers.
NOTICE
Consult and follow all local Building and
Fire Regulations and other Safety Codes that
apply to this installation. Consult local gas
utility company to authorize and inspect all
gas and flue connections.
A gas appliance that draws combustion air from the equipment
room where it is installed must have a supply of fresh air
circulating around it during burner operation for proper gas
combustion and proper venting.
 WARNING
Should overheating occur or the gas supply
fail to shut off, do not turn off or disconnect
the electrical supply to the pump. Instead,
shut off the gas supply at a location external
to the appliance.
Prevention of freezing –
Heat exchangers and headers damaged by freezing are not
covered by warranty.
See Section 7, Operating Information - Freeze Protection for
more information.
Codes –
The equipment shall be installed in accordance with those
installation regulations in force in the local area where the
installation is to be made. These shall be carefully followed in all
cases. Authorities having jurisdiction shall be consulted before
installations are made. In the absence of such requirements, the
installation shall conform to the latest edition of the National
Fuel Gas Code, ANSI Z223.1. Where required by the authority
having jurisdiction, the installation must conform to American
Society of Mechanical Engineers Safety Code for Controls and
Safety Devices for Automatically Fired Boilers, ASME CSD-1.
All boilers conform to the latest edition of the ASME Boiler
and Pressure Vessel Code, Section IV. Where required by the
authority having jurisdiction, the installation must comply with
the Canadian Gas Association Code, CAN/CGA-B149.1 and/
or B149.2 and/or local codes. This appliance meets the safe
lighting performance criteria with the gas manifold and control
assembly provided, as specified in the ANSI standards for gasfired hot water boilers, ANSI Z21.13 and gas water heaters,
ANSI Z21.10.3.
4
 WARNING
To minimize the possibility of serious
personal injury, fire or damage to your
unit, never violate the following safety
rules.
1. This unit is only for use with the type of gas indicated on the
rating plate.
2. If you smell gas
• shut off gas supply
• do not try to light any appliance
• do not touch any electrical switch; do not use any phone
in your building
• immediately call your gas supplier from a neighbor’s
phone. Follow the gas supplier’s instructions
• if you cannot reach your gas supplier, call the fire
department
3. Boilers and water heaters are heat producing appliances. To
avoid damage or injury, do not store materials against the
appliance or the vent-air intake system. Use proper care
to avoid unnecessary contact (especially children) with the
appliance and vent-air intake components.
4. Never cover your unit, lean anything against it, store trash
or debris near it, stand on it or in any way block the flow of
fresh air to your unit.
5. UNDER NO CIRCUMSTANCES MUST FLAMMABLE
MATERIALS SUCH AS GASOLINE OR PAINT THINNER
BE USED OR STORED IN THE VICINITY OF THIS
APPLIANCE, VENT-AIR INTAKE SYSTEM OR ANY
LOCATION FROM WHICH FUMES COULD REACH
THE APPLIANCE OR VENT-AIR INTAKE SYSTEM.
6. Appliance surfaces become hot during operation. Be careful
not to touch hot surfaces. Keep all adults, children, and
animals away from operation of the hot unit. Severe burns
can occur.
7. You must take adequate care to prevent scald injury when
storing water at elevated temperatures for domestic use.
8. This unit must have an adequate supply of fresh air during
operation for proper gas combustion and venting.
9. Make sure all exhaust venting is properly installed and
maintained. Improper venting of this unit could lead to
increased levels of carbon monoxide.
10. Do not use this boiler if any part has been under water.
Immediately call a qualified service technician to replace
the boiler. The possible damage to a flooded boiler can
be extensive and present numerous safety hazards. Any
appliance that has been under water must be replaced.
11. Do not alter this unit in any way. Any change to this unit or
its controls can be dangerous.
Installation & Operation Manual
The Copper-fin II - How it works...
1.
Heat exchanger
The heat exchanger allows system water to flow through specially
designed tubes for maximum heat transfer. The glass lined
headers and copper fined tubing are encased in a jacket that
contains the combustion process.
2.
Heat exchanger access cover
The heat exchanger access cover is a galvanized steel door which
allows access for service, maintenance, and removal of the
heat exchanger from inside the combustion chamber.
3.
Blower
The blower pulls in and injects air into the individual burners
along with gas from the gas manifold where the mix is burned inside
the combustion chamber.
4.
Gas valve
The gas valves (reference) have a dual purpose; changing the gas
supply pressure to manifold pressure, and the reference side of the
gas valve is designed to allow chamber pressure to change the
volume of gas through the valve and measured as net manifold
pressure. This is not a design to compensate for gas supply
pressure issues.
5.
System / tank temperature sensor (not shown)
When connected, this sensor can be used as a system sensor or a
tank sensor.
6.
Outlet/limit temperature sensor
This sensor monitors the outlet water temperature.
If
selected as the controlling sensor and a system supply
sensor is not connected, the appliance will maintain
set point by adjusting the firing rate of the unit according to
this sensor.
7.
Inlet temperature sensor
This sensor monitors inlet water temperature. If selected as
the controlling sensor and a system return sensor
is not connected, the appliance will maintain set point
by adjusting the firing rate of the unit according to this
sensor.
8.
Temperature and pressure gauge (boilers only)
The temperature and pressure gauge monitors the outlet
temperature of the appliance as well as the system water
pressure.
9.
Electronic display
The electronic display consists of 6 buttons and a two-line
16-character liquid crystal display used to monitor the
operation of the heater as well as enter and view the
programming of the main control board.
10. Burner
The burner is a ported stainless steel construction which uses a gas
air mix to operate at a fixed input. Banks of burners turn on
or off to vary the firing rate.
11. Water outlet (system supply)
The water outlet is a 2 or 2 1/2" (depending on model) pipe
connection that supplies water to the system with connections
for a flow switch (see #26), a relief valve (see #23), and a
temperature and pressure gauge (boilers only) (see #8).
12. Water inlet (system return)
The water inlet is a 2 or 2 1/2" (depending on model) pipe
connection that receives water from the system and delivers it to
the heat exchanger.
13. Gas supply pipe
The gas supply pipe on this appliance is 1 1/4 or 2" (depending on
model) diameter NPT. Please reference the National Fuel Gas
Code charts for connection details.
15. Air intake
Fresh air for combustion is drawn through a filter provided at the
air intake, located at either the rear or right side of the appliance.
16. Line voltage terminal strip
The line voltage terminal strip provides a location to connect
all of the line voltage (120 VAC) contact points to the unit.
17. Low voltage connection board(s)
The low voltage connection board provides a location to connect
all of the low voltage devices to the appliance. This is where most
of the external safety controls are connected.
18. Front doors - upper and lower
The front doors provide access to the gas train as well as the
blower, burners and other key components for service and
maintenance.
19. Hot surface igniter (HSI)
The hot surface igniter is a device that is used to ignite the
air/gas mixture as well as monitor the performance of the flame
during operation. This device acts as a flame sense electrode.
20. Flame inspection window (sight glass)
The flame inspection windows, located on either side of the
appliance, allow for visual inspection of the burners and flame
during operation.
21. Gas shut off valve (downstream test cock) (boiler only)
The downstream test cock is provided in the gas train to ensure
complete shut off of the gas to the burner in case of
maintenance, inspection, or testing of the valve.
22. Manual reset high limit sensor
This device monitors the outlet water temperature to ensure
safe operation. If the temperature exceeds its setting (field
adjustable), it will break the control circuit, shutting the
appliance down. Manual reset is performed through the display.
23. Relief valve
The relief valve is a safety device that ensures the maximum
pressure of the appliance is not exceeded. Boilers operate on
pressure only and are shipped from the factory at a rating of
50 PSI. Water heaters operate on temperature and pressure and
are shipped standard as 150 PSI and 210°F (98.9°C).
24. Power switch
The power switch is used to engage and disengage power to the
appliance on the 120 VAC circuit.
25. Air pressure switch
The air pressure switch is a safety device which ensures proper
blower operation. The air pressure switch is wired in series with
the low voltage control circuit in such a way that if the fan does not
engage or shuts down prematurely the device will break the
control circuit and the unit will shut down.
26. Flow switch
The flow switch is a safety device that ensures flow through the
heat exchanger during operation. This appliance is low mass and
should never be operated without flow. The flow switch makes
contact when flow is detected and allows the unit to operate. If
flow is discontinued during operation for any reason the flow
switch will break the control circuit and the unit will shut down.
27. Drain port(s)
The drain ports are located underneath the front header.
28. Manual shutoff valve (not shown)
Manual valve used to isolate the unit from the gas supply.
14. SMART SYSTEM Control Module
The SMART System Control Module is the main control for the
appliance. This module contains the programming that
operates the blower, gas valve, and pumps in addition to other
programmable features.
5
Installation & Operation Manual
The Copper-fin II - How it works...
18
13
15
23
26
27
18
Models 402 - 752 Rear View
Models 402 - 752 Front View
14
7
17
3
8
16
24
4
6
22
25
12
19
1
21
2
Models 402 - 752 Right Side (inside unit)
6
9
11
10
20
Models 402 - 752 Left Side (inside unit)
Installation & Operation Manual
The Copper-fin II - How it works...
18
13
(continued)
15
26
23
8
27
18
Models 992 - 2072 Rear View
Models 992 - 2072 Front View
14
25
17
3
7
6
22
16
8
4
24
11
9
10
12
19
21
2
1
20
Models 992 - 2072 Right Side (inside unit)
Models 992 - 2072 Left Side (inside unit)
7
Installation & Operation Manual
Ratings
HLW
Copper-fin II
AHRI Rating
Input
MBH
Model Number
Other Specifications
Gross
Output
MBH
Net
AHRI
Ratings
Water,
MBH
(Note 1)
(Note 2)
(Note 4)
Note: Change “N” to
“L” for L.P. gas models.
Appliance
Water
Water
Gas
Content Connections Connections
Gallons
Air / Vent
Sizes
(Note 3)
Min
Max
CFN0402
250
399
339
295
1.6
2"
1-1/4"
6"
CFN0502
250
500
425
370
1.7
2"
1-1/4"
6"
CFN0652
250
650
553
481
2.0
2"
1-1/4"
8"
CFN0752
250
750
638
555
2.1
2"
1-1/4"
8"
CFN0992
360
990
842
732
2.2
2-1/2"
2"
10"
CFN1262
360
1260
1071
931
2.6
2-1/2"
2"
12"
CFN1442
360
1440
1224
1064
2.9
2-1/2"
2"
12"
CFN1802
360
1800
1530
1330
3.3
2-1/2"
2"
12"/14"
CFN2072
630
2070
1760
1530
3.6
2-1/2"
2"
12"/14"
CHN0402
250
399
339
295
1.6
2"
1-1/4"
6"
CHN0502
250
500
425
370
1.7
2"
1-1/4"
6"
CHN0652
250
650
553
481
2.0
2"
1-1/4"
8"
CHN0752
250
750
638
555
2.1
2"
1-1/4"
8"
CHN0992
360
990
842
732
2.2
2-1/2"
2"
10"
CHN1262
360
1260
1071
931
2.6
2-1/2"
2"
12"
CHN1442
360
1440
1224
1064
2.9
2-1/2"
2"
12"
CHN1802
360
1800
1530
1330
3.3
2-1/2"
2"
12"/14"
CHN2072
630
2070
1760
1530
3.6
2-1/2"
2"
12"/14"
NOTICE
Maximum allowed working pressure is located on the rating plate.
Notes:
1. The ratings are based on standard test procedures prescribed
by the United States Department of Energy.
2. Net AHRI ratings are based on net installed radiation of
sufficient quantity for the requirements of the building
and nothing need be added for normal piping and pickup.
Ratings are based on a piping and pickup allowance of 1.15.
8
3. Copper-fin II’s require special gas venting. Use only the
vent materials and methods specified in the Copper-fin II
Installation and Operation Manual.
4. The Copper-fin II is orificed for operation up to 2000
feet altitude, and including up to 4,500 feet, with no field
adjustments. The appliance will de-rate by 4% for each
1000 feet above sea level up to 4,500 feet. Consult the
factory for installations above 4,500 feet elevation.
Installation & Operation Manual
1
Determine unit location
Location of unit
This unit meets the safe lighting performance criteria with the
gas manifold and control assembly provided, as specified in
the ANSI standards for gas-fired units, ANSI Z21.13/CSA 4.9
and ANSI Z21.10.3/CSA 4.3 - latest edition.
1. Maintain all clearances from combustible construction
when locating appliance. See Clearances from Combustible
Construction, this page.
2. Locate the appliance so that if water connections should
leak, water damage will not occur. When such locations
cannot be avoided, it is recommended that a suitable
drain pan, adequately drained, be installed under the unit.
The pan must not restrict combustion airflow. Under no
circumstances is the manufacturer to be held responsible
for water damage in connection with this unit, or any of its
components.
3. The appliance must be installed so that the ignition
system components are protected from water (dripping,
spraying, rain, etc.,) during appliance operation and service
(circulator replacement, control replacement, etc.,).
4. Appliances located in a residential garage and in adjacent
spaces that open to the garage and are not part of the living
space of a dwelling unit must be installed so that all burners
and burner ignition devices have a minimum clearance of
not less than 18" (46 cm) above the floor. The appliance
must be located or protected so that it is not subject to
physical damage by a moving vehicle.
5. DO NOT install this appliance in any location where
gasoline or flammable vapors are likely to be present.
6. The appliance must be installed on a level floor.
7. Combustible floor installation:
a. Models 402 - 752 require an approved floor kit for
installation on combustible flooring (reference Table
1A).
b. Models 992 - 2072 are approved for installation
on combustible flooring without a floor kit. Note:
Concrete block over wood flooring is not considered
non-combustible.
8. DO NOT install this appliance directly on carpeting or
other combustible material.
9. Maintain required clearances from combustible surfaces,
reference the Indoor Clearances from Combustible
Construction Section, this page.
10. For outdoor models, you must install an optional vent
cap. Instructions for mounting the vent cap are included
in the venting section of this manual. Do not install
outdoor models directly on the ground. You must install
the outdoor unit on a concrete, brick, block, or other
non-combustible pad. Outdoor models have additional
special location and clearance requirements. See Outdoor
Installation Venting, page 30. A wind proof cabinet
protects the unit from weather.
Indoor clearances
construction
from
combustible
Maintain minimum specified clearances for adequate
operation. Allow sufficient space for servicing pipe
connections, pump and other auxiliary equipment, as well
as the unit. See rating plate for specific service clearance
requirements.
Right Side
3" (7.5 cm)
Rear
3" (7.5 cm) (3" min. from any surface)*
Left Side
6" (15 cm) (24" (0.61 m) suggested for
service)
Front
Alcove* (30" (0.76m) suggested for service)
Top
3" (7.5 cm)
Flue
1" (25.4 mm)
Hot Water Pipes 1" (25.4 mm)
*An Alcove is a closet without a door. Thirty-six inches (36")
to rear required for outdoor installation.
Note: No additional clearance is needed on the right side of the
unit for the observation port. An observation port is located on
both the right and left side of the unit.
Figure 1-1_Indoor clearances from combustible construction
3"
MIN
REAR
3"
MIN
TOP
3"
MIN
RIGHT SIDE
6"
MIN
LEFT SIDE
30"
MIN
FRONT
NOTICE
Clearances from combustible construction
are noted on the appliance rating plate.
TABLE - 1A
COMBUSTIBLE FLOOR KITS
Model
Kit Number
402
CFK3301
502
CFK3302
652
CFK3303
752
CFK3304
Freeze protection
Although these units are CSA International design-certified for
outdoor installations, such installations are not recommended
in areas where the danger of freezing exists. You must provide
proper freeze protection for outdoor installations, units installed
in unheated mechanical rooms or where temperatures may
drop to the freezing point or lower. If freeze protection is not
provided for the system, a low ambient temperature alarm is
recommended for the mechanical room. Damage to the unit by
freezing is non-warrantable.
9
Installation & Operation Manual
1
Determine unit location
Anytime the inlet temperature drops below 45°F, the
control turns on the pump contact. If the inlet temperature is
below 37°F, and the unit is in the ON Mode, the first stage will
fire.
Location
Locate indoor boilers and water heaters in a room having a temperature safely above freezing [32°F (0°C)].
A mechanical room operating under a negative
draft pressure may experience a down draft
in the flue of a boiler when it is not firing. Figure 1-2_Outside Combustion Air - Single Opening
The cold outside air pulled down the flue
may freeze a heat exchanger. This condition Two Openings
must be corrected to provide adequate freeze The combustion air opening must have a minimum free area of
one square inch per 4000 Btu/hr input (5.5 cm2 per kW). You
protection.
must locate this opening within 12" (30 cm) of the bottom of the
Hydronic systems anti-freeze
enclosure (see FIG. 1-3).
Freeze protection for a heating boiler or hot water supply boiler The ventilation air opening must have a minimum free area of
using an indirect coil can be provided by using hydronic system one square inch per 4000 Btu/hr input (5.5 cm2 per kW). You
antifreeze. Follow the appliance manufacturers instructions. Do must locate this opening within 12" (30 cm) of the top of the
not use undiluted or automotive type antifreeze (see page 47).
enclosure.
 CAUTION
Outdoor boiler installation
Adequate hydronic system antifreeze must be used. A snow
screen should be installed to prevent snow and ice accumulation
around the unit or its venting system.
Combustion and ventilation air
Provisions for combustion and ventilation air must be in
accordance with Air for Combustion and Ventilation, of the
latest edition of the National Fuel Gas Code, ANSI Z223.1,
in Canada, the latest edition of CAN/CGA-B149 Installation
Code for Gas Burning Appliances and Equipment, or applicable
provisions of the local building codes.
Provide properly-sized openings to the equipment room to
assure adequate combustion air and proper ventilation when
the unit is installed with conventional venting or sidewall
venting.
Combustion air options
 CAUTION
Under no circumstances should the
equipment room ever be under a
negative pressure.
Particular care
should be taken where exhaust fans,
attic fans, clothes dryers, compressors,
air handling units, etc., may take away
air from the unit.
Figure 1-3_Outside Combustion Air - Two Openings
2. Outside Combustion Air, Using Ducts
You can direct outside combustion air to this unit using two air
ducts to deliver the air to the boiler room (see FIG. 1-5).
Each of the two openings must have a minimum free area of one
square inch per 2000 Btu input (11cm2 per kW).
3. Combustion Air from Interior Space
You can direct combustion air to this unit using air from an
adjoining interior space. You must provide two openings from
the boiler room to the adjoining room (see FIG. 1-4).
Each of the two openings must have a net free area of one square
inch per 1000 Btu input (22cm2 per kW), but not less than 100
square inches (645cm2).
This unit has four combustion air options.
1. Outside Combustion Air, No Ducts
You can direct outside combustion air to this unit using either
one or two permanent openings (see FIG. 1-2).
One Opening
The opening must have a minimum free area of one square
inch per 3000 Btu input (7 cm2 per kW). You must locate this
opening within 12" (30 cm) of the top of the enclosure.
10
Figure 1-4_Combustion Air from Interior Space
Installation & Operation Manual
1
Determine unit location
(continued)
All dimensions are based on net free area in square inches.
Metal louvers or screens reduce the free area of a combustion air
opening a minimum of approximately 25%. Check with louver
manufacturers for exact net free area of louvers. Where two
openings are provided, one must be within 12" (30 cm) of the
ceiling and one must be within 12" (30 cm) of the floor of the
equipment room. Each opening must have a minimum net free
area as specified in TABLE 1C, page 11. Single openings shall be
installed within 12" (30 cm) of the ceiling.
 CAUTION
Figure 1-5_Outside Combustion Air Through Ducts
4. Outside Combustion Air - Using Direct Venting
With this option, you can connect combustion air vent piping
directly to the unit. See the information under Direct Venting
starting on page 26 for specific information regarding this
option.
The combustion air supply must be
completely free of any flammable vapors
that may ignite or chemical fumes which
may be corrosive to the appliance. Common
corrosive chemical fumes which must be
avoided are fluorocarbons and other
halogenated compounds, most commonly
present as refrigerants or solvents, such as
Freon, trichlorethylene, perchlorethylene,
chlorine, etc.
These chemicals, when
burned, form acids which quickly attack
the heat exchanger finned tubes, headers,
flue collectors, and the vent system. The
result is improper combustion and a nonwarrantable, premature unit failure.
TABLE - 1C
MINIMUM RECOMMENDED COMBUSTION
AIR SUPPLY TO EQUIPMENT ROOM
*Outside Air from
Inside Air from
Inside Air from
2 Openings Directly from *Outside Air from
2 Ducts Delivered from
2 Ducts Delivered from Interior
Model
1 Opening Directly
Outdoors
Outdoors
Space
Number
Top
Bottom
Top
Bottom
Top
Bottom
from Outdoors, in2
Opening, in2
Opening, in2
Opening, in2
Opening, in2
Opening, in2 Opening, in2
100
100
133
200
200
400
400
402
(645 cm2)
(645 cm2)
(858 cm2)
(1291 cm2)
(1291 cm2)
(2581 cm2)
(2581 cm2)
125
167
250
250
500
500
125
502
(806 cm2)
(1077 cm2)
(1613 cm2)
(1613 cm2)
(3226 cm2)
(3226 cm2)
(806 cm2)
163
163
217
325
325
650
650
652
(1052 cm2)
(1052 cm2)
(1400 cm2)
(2097 cm2)
(2097 cm2)
(4194 cm2)
(4194 cm2)
188
188
250
375
375
750
750
752
(1213 cm2)
(1213 cm2)
(1613 cm2)
(2420 cm2)
(2420 cm2)
(4839 cm2)
(4839 cm2)
992
248
(1600 cm2)
248
(1600 cm2)
330
(2129 cm2)
495
(3194 cm2)
495
(3194 cm2)
990
(6388 cm2)
990
(6388 cm2)
1262
315
(2032cm2)
360
(2323cm2)
450
(2903cm2)
518
(3342cm2)
315
(2032cm2)
360
(2323cm2)
450
(2903cm2)
518
(3342cm2)
420
(2710 cm2)
480
(3097 cm2)
600
(3871 cm2)
690
(4452 cm2)
630
(4065 cm2)
720
(4646 cm2)
900
(5807 cm2)
1035
(6678 cm2)
630
(4065 cm2)
720
(4646 cm2)
900
(5807 cm2)
1035
(6678 cm2)
1260
(8130 cm2)
1440
(9291 cm2)
1800
(11614 cm2)
2070
(13356 cm2)
1260
(8130 cm2)
1440
(9291 cm2)
1800
(11614 cm2)
2070
(13356 cm2)
1442
1802
2072
*Outside air openings shall directly communicate with the outdoors. When combustion air is drawn from the outside through a
duct, the net free area of each of the two openings must have twice (2 times) the free area required for Outside Air/2 Openings.
The above requirements are for the boiler only; additional gas fired appliances in the equipment room will require an increase in
the net free area to supply adequate combustion air for all appliances.
11
Installation & Operation Manual
1
Determine unit location
Exhaust fans
Combustion air filter
Any fan or equipment which exhausts air from the boiler room
may deplete the combustion air supply and/or cause a down
draft in the venting system. Spillage of flue products from the
venting system into an occupied living space can cause a very
hazardous condition that must be immediately corrected. If a
fan is used to supply combustion air to the boiler room, the
installer must make sure that it does not cause drafts which
could lead to nuisance operational problems with the boiler.
This unit has a standard air filter located at the combustion air
inlet. This filter helps ensure clean air is used for the combustion
process. Check this filter every month and replace when it
becomes dirty. The filter size on Models 402 - 752 is 12" x 12"
x 1" (30.5cm x 30.5cm x 2.5cm) and 16" x 16" x 1" (40.6cm x
40.6cm x 2.5 cm) on Models 992 - 2072. You can find these
commercially available filters at any home center or HVAC
supply store.
Vertical DirectAire™, Horizontal DirectAire™, and Direct Vent
venting systems have specific requirements for combustion air
ducts from the outside which are directly connected to the unit.
See the requirements for combustion air duct in the venting
section.
For convenience and flexibility, you can direct the combustion
air inlet from either the back or right side of the unit. To arrange
the combustion air inlet for side entry, follow the steps below:
NOTICE
Use of filters having MERV (Minimum
Efficiency Reporting Value) ratings higher than
4 is not recommended. Higher efficiency
low-micron filters can limit combustion
air leading to either nuisance problems or
potential component damage if used over
prolonged periods of time. Filters having
a MERV rating of 5 to 6 may be used
on a limited basis during the construction
phase of a project provided they are replaced
once filter loading becomes apparent. After
the construction phase is completed, it is
recommended that the filter be changed to a
4 or lower MERV disposable type filter.
Figure 1-6_Metal Panel Covering Side Combustion
Air Inlet
1. Remove the metal panel from the unit’s side wall (see
FIG. 1-6).
2. Remove screws from the air filter/bracket assembly.
3. Move the filter/bracket assembly from the rear of unit to the
side opening (see FIG. 1-7).
4. Attach filter/bracket assembly to the unit’s side using the
pre-drilled screw holes.
5. Attach the metal panel to the rear combustion air opening
to seal it off.
Figure 1-7_Moving Air Filter / Bracket Assembly from
Rear of Unit to Side
NOTICE
During construction the air filter should be checked more frequently to ensure it does not become clogged with
combustion dirt and debris.
CAUTION
Sustained operation of an appliance with a clogged filter may result in nuisance operational problems, bad
combustion, and non-warrantable component failures.
12
Installation & Operation Manual
2
Venting
BEFORE YOU BEGIN
Identify your appliance’s vent system:
This manual covers venting requirements for CAT I models and CAT IV vent materials. Be sure to correctly identify the type of
vent system your appliance requires before proceeding.
C(F,H)
C(F,H)
C(F,H)
C(F,H)
C(F,H)
C(F,H)
(N,L)0402
(N,L)0502
(N,L)0652
(N,L)0752
(N,L)0992
(N,L)1262
C(F,H) (N,L)1442
C(F,H) (N,L)1802
C(F,H) (N,L)2072
 DANGER
Venting options:
A B C D
E
F
= B-Vent Material
CAT I
= Direct Vent Options
CAT IV
= Outdoor Vent Option
Failure to use correct venting materials can result in loss of life from flue gas spillage into working or living
space.
Venting Category Definitions: (Reference National Fuel Gas Code ANSI Z223.1)
CAT I: Negative pressure non-condensing
An appliance that operates with a non-positive vent static pressure with a vent gas temperature that avoids excessive condensate
production in the vent.
CAT IV: Positive pressure condensing
An appliance that operates with a positive vent static pressure with a vent gas temperature that may cause excessive condensate
production in the vent.
CAT IV Flue pipe materials
The following manufacturers supply flue materials suitable for these models when installed as CAT IV. All materials are made with
AL29-4C stainless steel.
Heat-Fab Inc., Saf-T CI Vent with AL29-4C stainless steel
Protech Systems Inc., Fas N Seal Vent with AL29-4C stainless steel
Metal-Fab Inc., Corr/Guard Vent with AL29-4C stainless steel
Or other listed Category IV vent systems suitable for a condensing, positive pressure, gas fired appliance.
A Category IV flue MUST have all vent joints and seams sealed gastight and have provisions for a drain to properly collect and
dispose of condensate that may occur in the venting system.
13
Installation & Operation Manual
2
Venting
Vent system options:
A
(Note: Installations shown below are representative, actual installations may vary from those shown.)
This option uses a vertical rooftop flue termination
with air supplied from the equipment room - see
page 16.
CONVENTIONAL NEGATIVE
DRAFT VENTING
D
This option uses a powered vent assembly to
exhaust the flue products out a sidewall with air
supplied by a pipe from the sidewall - see page 25.
HORIZONTAL DIRECTAIRE
VENTING
NOTE: CAT I B-VENT MATERIALS MAY BE USED WHEN THE
POWERED VENT IS CONNECTED DIRECTLY TO THE OUTSIDE
VENT CAP. IF THE POWERED VENT IS NOT CONNECTED
DIRECTLY TO THE OUTSIDE VENT CAP, THEN CAT IV - AL29-4C
VENT MATERIALS MUST BE USED FROM THE POWERED VENT
TO THE OUTSIDE VENT CAP.
3'
MIN
12"
MIN
B
This option uses a vertical conventional vent for
flue products with air supplied by a pipe from the
sidewall or rooftop - see page 19.
VERTICAL DIRECTAIRE VENTING
E
DIRECT VENT
This option uses a sealed AL29-4C flue and a
separate combustion air pipe to the outdoors.
This system terminates both the flue and
combustion air inlet in the same pressure zone
- see page 26.
3'
MIN
12"
MIN
C
This option uses a powered vent assembly
to exhaust the flue products out a sidewall
vent termination with air supplied from the
equipment room - see page 22.
OUTDOOR VENTING
SIDEWALL VENTING
NOTE: CAT I B-VENT MATERIALS MAY BE USED WHEN THE
POWERED VENT IS CONNECTED DIRECTLY TO THE OUTSIDE
VENT CAP. IF THE POWERED VENT IS NOT CONNECTED
DIRECTLY TO THE OUTSIDE VENT CAP, THEN CAT IV - AL29-4C
VENT MATERIALS MUST BE USED FROM THE POWERED VENT
TO THE OUTSIDE VENT CAP.
14
F
This option uses the installation of a special air
inlet / vent cap on top of the unit - see page 30.
Installation & Operation Manual
2
Venting
(continued)
General information
You must supply adequate combustion and ventilation air to this unit. You must provide minimum clearances for the vent
terminal from adjacent buildings, windows that open, and building openings. Follow all requirements set forth in the latest edition
of the National Fuel Gas Code, ANSI Z223.1, in Canada, the latest edition of CAN/CGA Standard B149 Installation Code for Gas
Burning Appliances and Equipment or applicable local building codes. Vent installations for connection to gas vents or chimneys
must be in accordance with “Venting of Equipment” of the above-mentioned standards.
NOTICE
Examine the venting system at least once each year. Check all joints and vent pipe connections for tightness. Also
check for corrosion or deterioration. If you find any problems, correct them at once.
Venting support
Support horizontal portions of the venting system to prevent sagging. Provide an upward slope of at least 1/4 inch per foot
(21mm/m) on all horizontal runs from the unit to the vertical flue run or to the vent terminal on sidewall venting installations.
Do not use an existing chimney as a raceway if another appliance or fireplace is vented through the chimney. The weight of the
venting system must not rest on the unit. Provide adequate support of the venting system. Follow all local and applicable codes.
Secure and seal all vent connections. Follow the installation instructions from the vent material manufacturer.
Barometric damper location
Any venting system option that requires a barometric damper must adhere to the following directions for optimum performance.
The preferred location for the barometric damper is in a tee or collar installed in the vertical pipe rising from the unit’s flue outlet.
The barometric damper MUST NOT be installed in a bull head tee installed on the unit’s flue outlet. The tee or collar containing
the barometric damper should be approximately three feet vertically above the connection to the unit’s flue outlet. This location
ensures that any positive velocity pressure from the unit’s internal combustion fan is dissipated and the flue products are rising
due to buoyancy generated from the temperature of the flue products. Adjust the weights on the damper to ensure that draft is
maintained within the specified range.
TABLE - 2A
FLUE AND AIR INLET PIPE SIZES
MODEL
FLUE SIZE
AIR INLET SIZE
MODEL
FLUE SIZE
AIR INLET SIZE*
402
502
652
752
--
6"
6"
8"
8"
--
6"
6"
8"
8"
--
992
1262
1442
1802
2072
10"
12"
12"
14"
14"
10"
12"
12"
12"
12"
*Minimum diameter for air inlet pipe. Installer may increase diameter one pipe size for ease of installation, if needed.
15
Installation & Operation Manual
2
Venting
A
Conventional negative draft venting - see page 14.
NOTICE
Before installing a venting system, follow requirements found in the General Venting section.
This option uses Type-B double-wall flue outlet piping. The blower brings in combustion air. The buoyancy of the
heated flue products cause them to rise up through the flue pipe. The flue outlet terminates at the rooftop.
Negative draft
The negative draft in a conventional vent installation must be within the range of 0.02 to 0.08 inches w.c. to ensure
proper operation. Make all draft readings while the unit is in stable operation (approximately 2 to 5 minutes).
Connect the flue vent directly to the flue outlet opening on the top of the unit. No additional draft diverter or
barometric damper is needed on single unit installations with a dedicated stack and a negative draft within the
specified range of 0.02 to 0.08 inches w.c. If the draft in a dedicated stack for a single unit installation exceeds the
maximum specified draft, you must install a barometric damper to control draft. Multiple unit installations with
combined venting or common venting with other Category I negative draft appliances require each boiler to have a
barometric damper installed to regulate draft within the proper range.
Do not connect vent connectors serving appliances vented by natural draft (negative draft) to any portion of a
mechanical draft system operating under positive pressure. Connecting to a positive pressure stack may cause flue
products to be discharged into the living space causing serious health injury.
Flue outlet piping
With this venting option, you must use Type-B double-wall vent materials. Vent materials must be listed by a
nationally-recognized test agency for use as vent materials. Make the connections from the unit vent to the outside
stack as direct as possible with no reduction in diameter. Use the National Fuel Gas Code venting tables for doublewall vent to properly size all vent connectors and stacks. Follow the vent manufacturer’s instructions when installing
Type-B vents and accessories, such as firestop spacers, vent connectors, thimbles, caps, etc.
Provide adequate clearance to combustibles for the vent connector and firestop.
When planning the venting system, avoid possible contact with plumbing or electrical wiring inside walls, ceilings,
and floors. Locate the unit as close as possible to a chimney or gas vent.
Avoid long horizontal runs of the vent pipe, 90° elbows, reductions and restrictions.
No additional draft diverter or barometric damper is required on single unit installations with a dedicated stack and
a negative draft maintained between 0.02 to 0.08 inches w.c.
Common Venting Systems
You can combine the flue with the vent from any other negative draft, Category I appliance. Using common venting
for multiple negative draft appliances requires you to install a barometric damper with each unit. This will regulate
draft within the proper range. You must size the common vent and connectors from multiple units per the venting
tables for Type-B double-wall vents in the latest edition of the National Fuel Gas Code, ANSI Z223.1 and/or CAN/
CGA-B149 Installation Code.
Common venting systems may be too large when an existing unit is removed.
At the time of removal of an existing appliance, the following steps shall be followed with each appliance remaining
connected to the common venting system placed in operation, while other appliances remaining connected to the
common venting system are not in operation.
1. Seal any unused opening in the common venting system.
2. Visually inspect the venting system for proper size and horizontal pitch. Make sure there is no blockage or
restriction, leakage, corrosion and other unsafe conditions.
3. If possible, close all building doors and windows. Close all doors between the space in which the appliances
remaining connected to the common venting system are located and other building spaces.
16
Installation & Operation Manual
2
Venting
(continued)
4. Turn on clothes dryers and any other appliances not connected to the common venting system. Turn on any exhaust fans, such
as range hoods and bathroom exhausts, so they will operate at maximum speed. Do not operate a summer exhaust fan.
5. Close fireplace dampers.
6. Place in operation the unit being inspected. Follow the lighting instructions. Adjust thermostat so unit will operate continuously.
7. Test for spillage at the draft hood/relief opening after 5 minutes of main burner operation. Use the flame of a match or candle,
or smoke from a cigarette, cigar or pipe.
8. After making sure that each appliance remaining connected to the common venting system properly vents when tested as above,
return doors, windows, exhaust fans, fireplace dampers and other gas burning appliances to their previous conditions of use.
9. Correct any improper operation of the common venting system so that the installation conforms to the latest edition of the
National Fuel Gas Code, ANSI Z223.1, in Canada, the latest edition of CAN/CGA-B149 Installation Code for Gas Burning
Appliances and Equipment. When resizing any portion of the common venting system, resize to approach the minimum size as
determined using the appropriate tables of the latest edition of the National Fuel Gas Code, ANSI Z223.1, in Canada, the latest
edition of CAN/CGA-B149 Installation Code for Gas Burning Appliances and Equipment.
Masonry chimney installations
A masonry chimney must be properly sized for the installation of a high efficiency gas-fired appliance. Venting of a high efficiency
appliance into a cold or oversized masonry chimney can result in operational and safety problems. Exterior masonry chimneys,
with one or more sides exposed to cold outdoor temperatures, are more likely to have venting problems. The temperature of the
flue products from a high efficiency appliance may not be able to sufficiently heat the masonry structure of the chimney to generate
proper draft. This will result in condensing of flue products, damage to the masonry flue/tile, insufficient draft and possible spillage
of flue products into an occupied living space. Carefully inspect all chimney systems before installation.
 WARNING
NOTICE
Do not vent this unit into a masonry chimney without a sealed stainless steel liner system. Any breaks, leaks,
or damage to the masonry flue/tile will allow the flue products to leak from the chimney and into occupied
living spaces. This could cause serious injury or death due to carbon monoxide poisoning and other harmful
flue products.
Check with local code officials to determine code requirements or the advisability of using a masonry chimney
with a sealed corrosion-resistant liner system.
Inspection of a masonry chimney
A masonry chimney must be carefully inspected to determine its suitability for the venting of flue products. A clay-tile-lined
chimney must be structurally sound, straight and free of misaligned tile, gaps between liner sections, missing sections of liner or any
signs of condensate drainage at the breaching or clean out. If there is any doubt about the condition of a masonry chimney, it must
be relined with a properly-sized and approved chimney liner system. An unlined masonry chimney must not be used to vent flue
products from this high-efficiency unit. An unlined chimney must be relined with an approved chimney liner system when a new
appliance is being attached to it. Metallic liner systems (Type-B double-wall or flexible or rigid metallic liners) are recommended.
Consult with local code officials to determine code requirements or the advisability of using or relining a masonry chimney.
Vertical vent termination clearances and location
The vent terminal should be vertical and exhaust outside the building at least 2 feet (0.61m) above the highest point of the roof
within a 10 foot (3.05m) radius of the termination.
The vertical termination must be a minimum of 3 feet (0.91m) above the point of exit.
A vertical termination less than 10 feet (3.05m) from a parapet wall must be a minimum of 2 feet (0.61m) higher than the parapet
wall.
Keep the vent cap clear of snow, ice, leaves, and debris to avoid blocking the flue.
17
Installation & Operation Manual
2
Venting
Figure 2-1_Vent Termination from Peaked Roof - 10 ft.
or Less From Ridge
NOTICE
Vent terminations are not shown in FIG.’s 2-1 thru 2-4. Make sure all vertical vents are installed with vent
terminations recommended by the vent manufacturer.
Figure 2-3_Vent Termination from Flat Roof - 10 ft.
or Less From Parapet Wall
18
Figure 2-2_Vent Termination from Peaked Roof - 10 ft.
or More From Ridge
Figure 2-4_Vent Termination from Flat Roof - 10 ft. or
More From Parapet Wall
Installation & Operation Manual
2
Venting
(continued)
Vertical DirectAire™ venting - see page 14.
B
NOTICE
Before installing a venting system, follow requirements found in the General Venting section.
The Vertical DirectAire™ vent system is the same as the Conventional Negative Draft vent system, except it pulls
combustion air from the outdoors through a separate air inlet pipe. Follow all requirements in the Conventional
Negative Draft Venting section on page 16.
The Vertical DirectAire™ vent system requires you to install two pipes directly to the unit; one vertical pipe with
a rooftop termination for the flue products and one pipe for combustion air. For this venting option, you must
purchase the DV box adapter from the appliance manufacturer. The DV box attaches to the air inlet of the unit. The
pipe for combustion air attaches to the DV box (see FIG. 2-11 on page 28). Reference page 28 for a list of approved
air intake materials.
Combustion air inlet piping
 WARNING
Locate and install the combustion air inlet cap correctly. Failure to do so can allow the discharge of flue products
to be drawn into the combustion process. This can result in incomplete combustion and potentially hazardous
levels of carbon monoxide in the flue products. This will cause operational problems and the spillage of flue
products. Spillage of flue products can cause personal injury or death due to carbon monoxide poisoning.
The sidewall or vertical rooftop DirectAire™ combustion air supply system has specific material and installation requirements. The
air inlet pipe connects directly to the unit to supply combustion air. In most installations, the combustion air inlet pipe will be a
dedicated system with one air inlet pipe per unit. You can combine multiple air inlets if the guidelines in Combined Air Inlet Points,
page 20 are followed. The air inlet pipe will be connected to a combustion air inlet cap as specified in this section.
For normal installations, this system uses a single-wall pipe to supply combustion air from outdoors directly to the unit.
In cold climates, use a Type-B double-wall vent pipe or an insulated single-wall pipe for combustion air. This will help prevent
moisture in the cool incoming air from condensing and leaking from the inlet pipe.
Length of air inlet pipe
The installed length of air inlet pipe from the unit to the outside air inlet cap must not exceed 50 equivalent feet (15.2m). Subtract
5 feet (1.5m) of equivalent length for each 90° elbow. Subtract 2.5 feet (0.7m) of equivalent length for each 45° elbow.
Do not exceed the limits for the combustion air inlet piping lengths.
Sidewall air inlet
The sidewall air inlet cap is supplied in the Sidewall Air Inlet Kit. Order the kit from the appliance manufacturer. This sidewall cap
supplies combustion air for a single unit only. See Table 2B, page 21, for kit numbers.
Locate the unit as close as possible to the sidewall where you will install the combustion air supply system.
Figure 2-5_Sidewall Combustion Air Inlet
Figure 2-6_Air Inlet Cap for Sidewall Termination
19
Installation & Operation Manual
2
Venting
To prevent recirculation of flue products from an adjacent vent cap into the combustion air inlet, follow all applicable clearance
requirements in the latest edition of the National Fuel Gas Code and/or CAN/CGA-B149 Installation Code and instructions in the
Installation and Operation Manual.
Clearances
You must install the combustion air inlet cap at least one foot (0.30m) above ground level and above normal snow levels.
The point of termination for the combustion air inlet cap must be at least 3 feet (0.91m) below the point of flue gas termination if
it is located within 10 feet (3.05m) of the flue outlet. Make sure to properly install the air inlet cap assembly on the air inlet pipe.
Do not install the combustion air inlet cap closer than 10 feet (3.05m) from an inside corner of an L-shaped structure.
Vertical Rooftop Air Inlet
Use the vertical air inlet terminations available from the appliance manufacturer, recommended and/or supplied by the vent
manufacturer, or use two 90° elbows as described on page 29.
3'
MIN
12"
MIN
You must locate the air inlet termination elbow at least 12"
(30cm) above the roof or above normal snow levels.
If the air inlet cap is within a 10-foot (3.05m) radius of the flue
outlet, the point of termination for the combustion air inlet
cap must be at least 3 feet (0.91m) below the point of flue gas
termination (vent cap).
Do not install the combustion air inlet cap closer than 10 feet
(3.05m) from an inside corner of an L-shaped structure.
Combined air inlet points
The air inlet pipes from multiple boilers can be combined to a
single common connection if the common air inlet pipe has a
cross sectional area equal to or larger than the total area of all air
inlet pipes connected to the common air inlet pipe.
Figure 2-7_Rooftop Combustion Air Inlet
Example: Two 10" air inlet pipes (78.5 in2 area each) have a total
area of 157 in2 and will require a 15" (176.7 in2 area) common
air inlet pipe.
The air inlet point for multiple boiler air inlets must be provided with an exterior opening which has a free area equal to or greater
than the total area of all air inlet pipes connected to the common air inlet. This exterior opening for combustion air must connect
directly to the outdoors. The total length of the combined air inlet pipe must not exceed a maximum of 50 (15.2m) equivalent feet.
Subtract 5 feet (1.5m) for each 90° elbow in the air inlet pipe. You must deduct the restriction in area provided by any screens, grills
or louvers installed in the common air inlet point. These are common on the sidewall air inlet openings. Screens, grills or louvers
installed in the common air inlet can reduce the free area of the opening from 25% to 75% based on the materials used.
You can terminate the combustion air pipe either horizontally with a sidewall air inlet or vertically with a rooftop air inlet. The
installed length of air inlet pipe from the unit to the outside air inlet cap must not exceed 50 equivalent feet (15.2m).
20
Installation & Operation Manual
2
Venting
(continued)
 WARNING
3'
MIN
12"
MIN
Only use a sidewall air inlet cap supplied by the appliance
manufacturer or a rooftop air inlet cap supplied by either the vent
or appliance manufacturer. Using any other air inlet cap for single
unit installations or using a common air inlet cap for multiple
units with insufficient free area and/or protections from wind and
weather may result in operational problems and the spillage of
flue products. Spillage of flue products can cause personal injury
or death due to carbon monoxide poisoning.
For single unit installations with sidewall air inlet you must order the sidewall air
inlet kit from the appliance manufacturer. The part number for each SVK kit is
listed by unit size in Table 2B.
For single unit installations with rooftop air inlet (see FIG. 2-8), you must order
the rooftop air inlet kit from the appliance manufacturer. The part number for
each VDK kit is listed by unit size in Table 2B. Purchase the flue pipe, rooftop
flue termination, and air inlet pipe locally.
Figure 2-8_Vertical DirectAire™ Installation There is no vent kit for combined air supply systems for multiple units. Make
w/Rooftop Combustion Air Inlet
sure the air inlet cap is properly sized. You must purchase this cap locally.
Venting of flue products
For venting flue products vertically to the outdoors, follow all requirements in
the installation instructions for conventional venting in this manual.
Follow all clearance requirements in Vertical Vent Termination Clearances and
Location on page 17.
A barometric damper is not required in the flue on Vertical DirectAire™
installations if the draft is within the negative 0.02 to 0.08 inches w.c. required
for proper operation. If the draft exceeds this range, install a barometric damper.
TABLE - 2B
MODEL
402
502
652
752
992
1262
1442
1802
2072
DIRECTAIRE KITS
HORIZONTAL KIT*
SVK3047
SVK3047
SVK3048
SVK3048
SVK3040
SVK3041
SVK3041
SVK3041
SVK3041
VERTICAL KIT*
VDK3026
VDK3026
VDK3027
VDK3027
VDK3023
VDK3024
VDK3024
VDK3024
VDK3024
*The SVK kits include a DV box adapter and sidewall air inlet cap. The VDK kits include a DV box adapter and a rooftop air inlet cap.
21
Installation & Operation Manual
2
Venting
Sidewall venting - see page 14.
C
NOTICE
Before installing a venting system, follow all requirements found in the General Venting
section.
This option uses a powered vent assembly which pulls the flue products out of the stack. This fan generates a negative
draft at the unit. Combustion air is drawn from the equipment room (see Combustion and Ventilation Air on 10).
Sidewall with fan
The sidewall fan can be mounted on the inside/outside (depending upon model) with a sidewall vent hood installed
on the exterior wall. The sidewall fan and accessories are included in a venting kit provided by the appliance
manufacturer. See Table 2C on page 24 for kit numbers.
The venting kit includes the sidewall fan, vent hood, tapered vent adapter, barometric damper (992 - 2072 Models),
proving switch and all necessary relays to interlock with the heaters control system. The tapered vent adapter reduces
the vent size at the inlet to the fan. There should be no reduction in vent diameter from the unit’s flue outlet to the
sidewall fan. The barometric damper must be installed on the flue and adjusted to supply a negative draft within the
range of 0.04 to 0.08 inches w.c. while unit is operating.
Flue outlet piping
With this venting option, you must use Type-B double-wall (or equivalent) vent materials. Vent materials must be
listed by a nationally-recognized test agency for use as vent materials. Make the connections from the unit vent to the
sidewall fan/cap as direct as possible with no reduction in diameter. Use the National Fuel Gas Code venting tables
for double-wall vent to properly size all vent connectors and stacks. Follow the vent manufacturer’s instructions
when installing Type-B vents and accessories, such as firestop spacers, vent connectors, thimbles, caps, etc.
When planning the venting system, avoid possible contact with plumbing or electrical wiring inside walls.
The maximum installed length of sidewall vent pipe with an induced draft fan must not exceed 100 feet (30.5m).
Subtract 5 feet (1.5m) for each 90° elbow. Subtract 2.5 feet (0.7m) for each 45° elbow.
Sidewall venting termination
The sidewall vent cap must be installed on an exterior sidewall. The sidewall fan/powered sidewall vent cap and
accessories are included in a venting kit which is furnished by the appliance manufacturer in accordance with CSA
International requirements. This venting kit includes the powered sidewall fan/cap, proving switch and all necessary
relays to interlock with the heaters control system.
The sidewall fan/powered vent cap must be interlocked with the units control system to start the fan on a call for
heat and prove fan operation before the boiler fires. Plug-in and terminal strip connections are provided on the unit
for easy connection of the factory supplied vent kit and control package for the sidewall vent fan. See the installation
instructions provided with the vent kit.
Sidewall vent termination clearances and location
Locate the bottom of the vent terminal at least 12 inches (30cm) above grade and above normal snow levels. Locate
the bottom of the vent terminal at least 7 feet (2.13m) above grade when located adjacent to public walkways. Do
not terminate directly above a public walkway.
Do not terminate the venting system in a window well, stairwell, alcove, courtyard, or other recessed area. Do not
terminate the venting system below grade.
Locate vent termination at least 3 feet (0.91m) from an inside corner of an L-shaped structure.
Provide a minimum clearance of 4 feet (1.2m) horizontally from electric meters, gas meters, regulators, and relief
equipment. Never locate vent cap above or below electric meters, gas meters, regulators, and relief equipment unless
a 4 foot (1.2m) horizontal clearance is maintained.
22
Installation & Operation Manual
2
Venting
(continued)
Terminate the venting system at least 3 feet (0.9m) above any forced air inlet within 10 feet (3.05m).
Terminate the venting system at least 4 feet (1.2m) below, 4 feet (1.2m) beside, or 1 foot (30cm) above any door, window, or gravity
air inlet into any building.
Locate vent termination at least 8 feet (2.4m) horizontally from any combustion air intake located above the sidewall termination
cap.
 CAUTION
Units which are shut down or will not operate may experience freezing due to convective air flow in the flue
pipe, through the air inlet, or from negative pressure in the equipment room. In cold climates, operate the
pump continuously to help prevent freezing of boiler water. Provide proper freeze protection. See Freeze
Protection, page 47.
Sidewall venting without fan
For Models 402 - 752 which are approved for sidewall venting without an external power vent fan, you must install specific vent
kits and venting materials (reference Table 2C on page 24 for kit numbers).
The following is a detailed explanation of Sidewall Venting Without an External Power Vent Fan installation requirements.
Flue outlet piping
Venting Guidelines
If using this venting option, a sealed AL29-4C venting system for flue products is required on all models of this appliance. This
venting system operates with a positive pressure in the vent. The internal combustion air blower generates this positive pressure
which operates the combustion process and also exhausts the flue products from the building.
This vent system has specific vent material and installation requirements. Only use listed sealed AL29-4C vent system materials.
Follow all installation requirements. See Table 2A for proper pipe size for your unit. A list of sealed AL29-4C flue pipe manufacturers
is located on page 15.
Seal all vent joints and seams gas-tight.
Drain tee installation
A drain tee must be installed in the vent pipe to collect and dispose of any condensate that may occur in the vent system. The drain
tee must be installed as the first fitting after the horizontal ell on the top of the unit (see FIG. 2-9). Plastic drain tubing, sized per
the vent manufacturer’s instructions, shall be provided as a drain line from the tee. The drain tubing must have a trap provided by
a 3" (7.6cm) diameter circular trap loop in the drain tubing. Prime the trap loop by pouring a small quantity of water into the drain
hose before assembly to the vent. Secure the trap loop in position with nylon wire ties. Use caution not to collapse or restrict the
condensate drain line with the nylon wire ties. The condensate drain must be routed to a suitable drain for disposal of condensate
that may occur in the direct vent system. Refer to the condensate drain installation instructions as supplied by the manufacturer
of the vent material.
Figure 2-9_Sidewall Vent - Models 402 - 752 (Only)
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Installation & Operation Manual
2
Venting
 WARNING
Do not combine the flue from this unit with the vent from any other appliance. Do not combine flues from
multiple appliances into a common vent. The flue from this unit must be a dedicated stack.
Connect the flue vent directly to the flue outlet opening on the top of the unit. Make the connections from the unit vent to the
outside stack as direct as possible with no reduction in diameter. Provide adequate clearance to combustibles for the vent connector
and firestop. Follow the vent manufacturer’s instructions when installing sealed AL29-4C vents and accessories, such as firestop
spacers, vent connectors, thimbles, caps, etc.
Provide adequate clearance to combustibles for the vent connector and firestop.
When planning the venting system, avoid possible contact with plumbing or electrical wiring inside walls, ceilings, and floors.
Locate the unit as close as possible to chimney or gas vent. When a vent system is disconnected for any reason, the flue must be
reassembled and resealed according to the vent manufacturer’s instructions.
The installed length of flue from the unit to the outside point of termination must not exceed 50 equivalent feet (15.2m). Subtract
5 feet (1.5m) of equivalent length for each 90° elbow. Subtract 2.5 feet (0.7m) of equivalent length for each 45° elbow.
Sidewall vent termination clearances and location
Follow all sidewall venting termination information for clearances and location under Sidewall Vent Termination Clearances and
Location on page 22.
TABLE - 2C
SIDEWALL VENT KITS
MODEL
KIT
(W/POWER FAN ASSY.)
MAX. VENT
LENGTH
VENT TERMINATION
ONLY
(MODELS 402 - 752)
MAX. VENT
LENGTH
402
SVK3006
100 ft.
SVK3043
50 ft.
502
SVK3006
100 ft.
SVK3043
50 ft.
652
SVK3008
100 ft.
SVK3044
50 ft.
752
SVK3008
100 ft.
SVK3044
50 ft.
992
SVK3009*
100 ft.
N/A
N/A
1262
SVK3010*
100 ft.
N/A
N/A
1442
SVK3010*
100 ft.
N/A
N/A
1802
SVK3012*
100 ft.
N/A
N/A
2072
SVK3012*
100 ft.
N/A
N/A
*These kits include a barometric damper.
24
Installation & Operation Manual
2
Venting
(continued)
Horizontal DirectAire™ venting (Powered Venting) - see page 14.
D
3'
MIN
12"
MIN
NOTICE
Before installing a venting system, follow all requirements found in the General Venting section.
The Horizontal DirectAire™ vent system is the same as the Sidewall Venting system, except it pulls combustion
air from the outdoors through a sidewall air inlet. Follow all requirements in Sidewall Venting section on page 22.
The Horizontal DirectAire™ vent system requires you to install two pipes directly to the unit; one pipe for flue
products and one for combustion air. Install both pipes horizontally with a sidewall termination point. For this
venting option, you must purchase the DV box accessory from the appliance manufacturer. The DV box attaches to
the air inlet of the unit. The pipe for combustion air attaches to the DV box (see FIG. 2-11 on page 28). Reference
page 28 for a list of approved air intake materials.
Make vent connection directly to the top of the unit. No additional draft diverter or barometric damper is required
on single unit installations with a dedicated stack and a negative draft maintained between 0.04 to 0.08 inches w.c.
The Horizontal DirectAire™ combustion air supply system has specific vent material and installation requirements.
The air inlet pipe connects directly to the boiler to supply combustion air. The combustion air inlet pipe is a
dedicated system with one air inlet pipe per boiler. You must connect the air inlet pipe to a combustion air inlet
cap as specified in this section.
Combustion air supplied from outdoors must be free of contaminants (see the Combustion and Ventilation Air
section on page 10).
You must order the Horizontal DirectAire™ Vent Kit for sidewall installation from the appliance manufacturer. See Table 2D for
kit numbers. Each kit includes a sidewall powered vent cap fan, proving switch, controls, combustion air inlet cap to supply air to
a single unit, the transition adapter to attach the field supplied single wall air inlet pipe to the unit and installation instructions.
Purchase flue pipe and air inlet pipe locally.
The sidewall air inlet cap supplied in the Horizontal DirectAire™ Vent Kit is used to supply combustion air to a single boiler.
Combustion air supply pipes from multiple units can not be combined into a single air inlet pipe and inlet point.
 WARNING Only use the sidewall air inlet cap recommended by the appliance manufacturer. Using another sidewall air
inlet cap may result in operational problems and the spillage of flue products. Spillage of flue products can
cause personal injury or death due to carbon monoxide poisoning.
Venting of flue products
For venting flue products horizontally, follow all requirements in the installation instructions for sidewall venting.
Termination point for the flue products must follow the clearance requirements in the Sidewall Venting Termination section on
page 22.
For proper operation, a barometric damper is provided for Horizontal DirectAire™ installations. The damper will help to ensure
a draft between negative 0.04 to 0.08 inches w.c.
TABLE - 2D
HORIZONTAL DIRECTAIRE™ KITS
MODEL
402
502
652
752
--
KIT
HDK3031
HDK3031
HDK3032
HDK3032
--
MODEL
992
1262
1442
1802
2072
KIT
HDK3026*
HDK3027*
HDK3027*
HDK3028*
HDK3028*
*These kits include a barometric damper.
25
Installation & Operation Manual
2
Venting
E
Direct venting - see page 14.
NOTICE
Before installing a venting system, follow all requirements found in the General Venting section.
This option uses sealed AL29-4C vent materials for the flue outlet piping and separate combustion air inlet piping.
This system terminates both the flue and combustion air inlet in the same pressure zone. The flue outlet and
combustion air intake may terminate at either a sidewall or the rooftop.
3'
MIN
12"
MIN
To use the optional Direct Vent system, you must install specific vent kits and venting materials. The following is
a detailed explanation of Direct Vent installation requirements, including the components used and vent kit part
numbers (reference Table 2E on page 27 for kit numbers).
Flue outlet piping
Venting Guidelines
If using this venting option, a sealed AL29-4C venting system for flue products is required on all models of this
appliance. This venting system operates with a positive pressure in the vent. The internal combustion air blower
generates this positive pressure which operates the combustion process and also exhausts the flue products from the
building.
This vent system has specific vent material and installation requirements. Only use listed sealed AL29-4C vent system
materials. Follow all installation requirements. See Table 2A, page 15 for proper pipe size for your unit.
Seal all vent joints and seams gas-tight.
Drain tee installation
A drain tee must be installed in the vent pipe to collect and dispose of any condensate that may occur in the vent system. The drain
tee must be installed as the first fitting after the horizontal ell on the top of the unit (see FIG. 2-9 on page 23). Plastic drain tubing,
sized per the vent manufacturer’s instructions, shall be provided as a drain line from the tee. The drain tubing must have a trap
provided by a 3" (7.6cm) diameter circular trap loop in the drain tubing. Prime the trap loop by pouring a small quantity of water
into the drain hose before assembly to the vent. Secure the trap loop in position with nylon wire ties. Use caution not to collapse
or restrict the condensate drain line with the nylon wire ties. The condensate drain must be routed to a suitable drain for disposal
of condensate that may occur in the direct vent system. Refer to the condensate drain installation instructions as supplied by the
manufacturer of the vent material.
 WARNING
Do not combine the flue from this unit with the vent from any other appliance. Do not combine flues from
multiple appliances into a common vent. The flue from this unit must be a dedicated stack.
Connect the flue vent directly to the flue outlet opening on the top of the unit. Make the connections from the unit vent to the
outside stack as direct as possible with no reduction in diameter. Provide adequate clearance to combustibles for the vent connector
and firestop. Follow the vent manufacturer’s instructions when installing sealed AL29-4C vents and accessories, such as firestop
spacers, vent connectors, thimbles, caps, etc.
Provide adequate clearance to combustibles for the vent connector and firestop.
When planning the venting system, avoid possible contact with plumbing or electrical wiring inside walls, ceilings, and floors.
Locate the unit as close as possible to chimney or gas vent.
When a vent system is disconnected for any reason, the flue must be reassembled and resealed according to the vent manufacturer’s
instructions.
The installed length of flue from the unit to the outside point of termination must not exceed 50 equivalent feet (15.2m). Subtract
5 feet (1.5m) of equivalent length for each 90° elbow. Subtract 2.5 feet (0.7m) of equivalent length for each 45° elbow.
Vertical DV venting termination
You must use the vent termination recommended by the vent manufacturer for vertical direct vent terminations. Follow all vertical
venting termination information for clearances and location under the Vertical Vent Termination Clearances and Location section
on pages 17 - 18.
26
Installation & Operation Manual
2
Venting
(continued)
Masonry chimney installation
Do not use a standard masonry chimney to directly vent the combustion products from this unit.
To use a masonry chimney, the chimney must use a sealed, corrosion-resistant liner system. Sealed, corrosion-resistant liner
systems (single-wall, double-wall, flexible, or rigid) must be rated for use with a high efficiency, positive pressure vent system.
Corrosion-resistant chimney liner systems are typically made from a high grade stainless steel such as AL29-4C. The liner must be
properly sized and fully sealed throughout the entire length. Both the top and bottom of the masonry chimney must be capped
and sealed to provide a dead air space around the liner.
 WARNING
Do not vent this unit into a masonry chimney without a sealed stainless steel liner system. Any breaks, leaks,
or damage to the masonry flue/tile will allow the positive-pressure flue products to leak from the chimney and
into occupied living spaces. This could cause serious injury or death due to carbon monoxide poisoning and
other harmful flue products.
NOTICE
Check with local code officials to determine code requirements or the advisability of using a masonry chimney
with a sealed corrosion-resistant liner system.
Horizontal DV venting termination
Horizontal venting uses the unit’s internal combustion air blower to force the flue products out of the horizontally-terminated flue.
You must purchase a horizontal direct vent kit from the appliance manufacturer to ensure proper operation. When installing
the vent cap, the wall opening must provide an air space clearance of 2 inches (5.1cm) around the flue pipe. The diameter of the
opening for installation of the sidewall cap will be 4 inches (10.2cm) larger (minimum) than the nominal diameter of the installed
vent pipe to the horizontal vent cap.
Install the horizontal vent cap from the outside. Mount the vent cap to the wall using four screws or wall anchors. Seal under the
screw heads with caulking. Install the Category IV vent pipe from the unit to the vent cap. See detailed instructions packed with
the horizontal direct vent kit.
Horizontal Vent Termination Clearances and Location
Follow all sidewall venting termination information for clearances and location under Sidewall Vent Termination Clearances and
Location, page 22.
TABLE - 2E
MODEL
402
502
652
752
--
HORIZONTAL
KIT*
DVK3004
DVK3004
DVK3005
DVK3005
--
DIRECT VENT KITS
VERTICAL
MODEL
KIT*
VDK3026
992
VDK3026
1262
VDK3027
1442
VDK3027
1802
-2072
HORIZONTAL
KIT*
DVK3000
DVK3001
DVK3001
DVK30000
DVK30000
VERTICAL
KIT*
VDK3023
VDK3024
VDK3024
VDK3024
VDK3024
*These kits include a DV box adapter, air inlet cap, and a sidewall vent termination. The VDK kits include a DV box adapter and an air inlet cap.
Combustion air inlet piping
The Direct Vent system requires the installation of a pipe to supply combustion air from the outdoors directly to the unit. Make
sure the combustion air inlet is in the same pressure zone as the vent terminal.
In cold climates, use a Type-B double-wall vent pipe or an insulated single wall pipe for combustion air. This will help prevent
moisture in the cool incoming air from condensing and leaking from the inlet pipe.
 CAUTION
Units that are shut down or will not operate may experience freezing due to convective airflow in the air inlet
pipe.
27
Installation & Operation Manual
2
Venting
Length of air inlet pipe
The installed length of air inlet pipe from the unit to the outside air inlet cap must not exceed 50 equivalent feet (15.2m). Subtract
5 feet (1.5m) of equivalent length for each 90° elbow. Subtract 2.5 feet (0.7m) of equivalent length for each 45° elbow.
Do not exceed the limits for the combustion air inlet piping lengths.
Connecting the air inlet pipe to the unit
Connect the air inlet piping directly to the unit by attaching it to the DV box adapter. The DV box adapter is included in the direct
vent kits. The combustion air inlet area of the unit is located at the right rear corner of the unit. This unit uses a simple air filter
to ensure clean air is used for the combustion process. Attach the DV box adapter over the air filter (see FIG. 2-11). Align screw
holes on the DV box adapter with the screw holes surrounding the air filter hanger. Insert sheet metal screws and tighten firmly.
For venting versatility, you can move the air filter assembly and DV box adapter to the right side of the unit. Remove the metal
panel on the unit’s right side (see FIG. 2-12). Remove the filter/bracket assembly from the rear of the unit. Attach the filter/bracket
assembly and DV box adapter to the right side opening using the pre-drilled screw holes. Make sure you attach the metal panel to
the rear combustion air opening of the unit.
The DV box adapter has an air inlet pipe mounting ring. Connect combustion air inlet piping to the direct vent box mounting ring.
VERTICAL DV BOX ADAPTER
HORIZONTAL DV BOX ADAPTER
Figure 2-11_Attaching DV Box Adapter to Unit
Figure 2-12_Moving Air Filter Assembly & DV Box Adapter
Air inlet piping materials
The air inlet pipe(s) must be sealed. Select air inlet pipe material from the following specified materials.
• PVC, CPVC, or ABS*
• Dryer vent or sealed flexible duct (not recommended for rooftop air inlet)
• Galvanized steel vent pipe with joints and seams sealed as specified below
• Type-B double-wall vent with joints and seams sealed as specified below.
* Plastic pipe may require an adapter (not provided) to transition between the air inlet connection on the unit and the plastic air
inlet pipe.
Use only vent or air intake materials specified in this manual. Follow vent pipe manufacturer’s instructions.
Failure to do so can result in property damage, personal injury, or death. Mixing of venting materials will void
the warranty and certification of this unit.
Sealing Type-B double-wall vent pipe or galvanized vent pipe
 WARNING
Follow the steps below to properly seal Type-B double-wall vent pipe or galvanized vent pipe.
1. Seal all joints and seams of the air inlet pipe using either aluminum foil duct tape meeting UL Standard 723 or 181 A-P or a
high quality UL Listed silicon sealant such as those manufactured by Dow Corning or General Electric.
2. On horizontal runs, do not install vent pipe with seams pointing down. Position vent pipe so that the seams are on the top side
of the vent pipe.
3. Secure all joints with a minimum of three sheet metal screws or pop rivets. Apply aluminum foil duct tape or silicone sealant
to all screws or rivets installed in the vent pipe.
4. Ensure that the air inlet pipes are properly supported.
Sealing PVC, CPVC, ABS, dryer vent, and flex duct vent pipe
1. Clean the PVC, CPVC, or ABS air inlet pipe using the pipe manufacturer’s recommended solvents. Seal the pipe joints using
standard commercial pipe cement.
28
Installation & Operation Manual
2
Venting
(continued)
2. For PVC, CPVC, ABS, dryer vent, or flex duct air inlet piping, use a silicone sealant to ensure a proper seal at the unit inlet and
the air inlet cap.
3. For Dryer vent or flex duct, also use a screw-type clamp to attach the inlet vent material to the unit inlet and the air inlet cap.
Properly sealing the air inlet pipe ensures that combustion air will be free of contaminates and supplied in proper volume.
4. Ensure that the air inlet pipes are properly supported.
 WARNING
Properly seal all joints and seams in the inlet vent piping system. Failure to do so may result in flue gas
recirculation, spillage of flue products, and carbon monoxide emissions. Carbon monoxide poisoning can
cause severe personal injury or death.
Vertical and sidewall combustion air inlet
NOTICE
To prevent recirculation of flue products into the combustion air inlet, follow all instructions in this section.
 WARNING
Locate and install the combustion air inlet termination correctly. Failure to do so can allow the discharge
of flue products to be drawn into the combustion process. This can result in incomplete combustion and
potentially hazardous levels of carbon monoxide in the flue products. This will cause operational problems
and the spillage of flue products. Spillage of flue products can cause personal injury or death due to carbon
monoxide poisoning.
You must locate the combustion air cap and the flue gas outlet on the same rooftop surface (vertical direct vent system) or sidewall
surface (horizontal direct vent system) and in the same pressure zone as the vent termination. Follow all clearance requirements
listed on this page.
Purchase and assemble the combustion air inlet cap to protect the air inlet from wind and weather.
Alternatively, assemble the combustion air inlet cap for vertical rooftop air inlet from items purchased locally. The air inlet cap
consists of two 90° elbows installed to the air inlet pipe (see FIG. 2-13). Install the first 90° elbow on the rooftop at the highest
vertical point of the air inlet pipe. Install the second 90° elbow on the horizontal outlet of the first elbow. The outlet of the second
90° elbow will be pointing down. You may use a 90° elbow and a 90° straight elbow to make this assembly. If you use a straight
piece of pipe between the two 90° elbows, it should not exceed 6" (51mm) in length.
6"
MAX
For horizontal direct vent termination of combustion air, you
must use the termination cap from the appliance manufacturer.
The sidewall air inlet cap is available as part of a direct vent kit.
See Table 2E, page 27 for Horizontal Direct Vent Kits.
Vertical Combustion Air Inlet Clearances
You must locate the air inlet termination elbow at least 12"
(30cm) above the roof or above normal snow levels.
If the air inlet cap is within a 10-foot (3.05m) radius of the flue
outlet, the point of termination for the combustion air inlet
cap must be at least 3 feet (0.91m) below the point of flue gas
termination (vent cap).
Figure 2-13_Vertical Rooftop Air Inlet
Do not install the combustion air inlet cap closer than 10 feet
(3.05m) from an inside corner of an L-shaped structure.
Horizontal combustion air inlet clearances
You must locate the horizontal air inlet termination point at least 12" (30cm) above grade and above normal snow levels.
If the air inlet cap is within a 10-foot (3.05m) radius of the flue outlet, the point of termination for the combustion air inlet cap
must be at least 3 feet (0.91m) below the point of flue gas termination (vent cap). Do not install the horizontal combustion air
inlet cap above the flue outlet.
Do not install the combustion air inlet cap closer than 10 feet (3.05m) from an inside corner of an L-shaped structure.
Multiple sidewall direct vent installations
You must locate the horizontal air inlet termination points at least 12" (30cm) above grade and above normal snow levels. The
combustion air inlet caps for multiple appliance installations must maintain the same minimum clearance from the closest flue vent
cap as specified in single appliance installations. You may install multiple flue outlet caps side-by-side and multiple combustion
air inlet caps side-by-side, but the air inlet must always be at least 3 feet (0.91m) horizontally and 3 feet (0.91m) below the closest
flue outlet. Do not install combustion air inlet caps above the flue outlets.
Maintain all clearances and installation requirements for multiple appliance installations.
29
Installation & Operation Manual
2
F
Venting
Outdoor installation - see page 14.
Before installing a venting system, follow all requirements found in the General Venting section.
NOTICE
Units are self-venting and can be used outdoors when installed with the optional outdoor cap. This cap mounts directly to the top
of the unit and covers the flue outlet and combustion air inlet openings. No additional vent piping is required.
Only install outdoor models outdoors and only use the vent cap supplied by the appliance manufacturer.
Personal injury or product damage may result if any other cap is used or if an outdoor model is used indoors.
Properly install all covers, doors and jacket panels to ensure proper operation and prevent a hazardous
condition.
Combustion air supply must be free of contaminants (see Combustion and Ventilation Air, page 10). To prevent recirculation of
the flue products into the combustion air inlet, follow all instructions in this section.
 WARNING
Outdoor vent/air inlet location
Keep venting areas free of obstructions. Keep area clean and free of combustible and flammable materials. Maintain a minimum
clearance of 3" (76mm) to combustible surfaces and a minimum of 36" (915mm) clearance to the air inlet. To avoid a blocked air
inlet or blocked flue condition, keep the outdoor cap air inlet, flue outlet and drain slot clear of snow, ice, leaves, debris, etc.
Do not install outdoor models directly on the ground. You must install the outdoor unit on a concrete, brick, block, or other noncombustible pad.
Do not locate unit so that high winds can deflect off of adjacent walls, buildings or shrubbery causing recirculation. Recirculation
of flue products may cause operational problems, bad combustion or damage to controls. Locate unit at least 3 feet (0.91m) from
any wall or vertical surface to prevent wind conditions from affecting performance.
Multiple unit outdoor installations require 48" (1.22m) clearance between each vent cap. Locate outdoor cap at least 48" (1.22m)
below and 48" (1.22m) horizontally from any window, door, walkway or gravity air intake.
Locate unit at least 10 feet (3.05m) away from any forced air inlet.
Locate unit at least 3 feet (0.91m) outside any overhang.
Clearances around outdoor installations can change with time. Do not allow the growth of trees, shrubs or other plants to obstruct
the proper operation of the outdoor vent system.
Do not install in locations where rain from building runoff drains will spill onto the unit.
Flue gas condensate can freeze on exterior walls or on the vent
cap. Frozen condensate on the vent cap can result in a blocked
flue condition. Some discoloration to exterior building or unit
surfaces can be expected. Adjacent brick or masonry surfaces
should be protected with a rust resistant sheet metal plate.
3'
MIN
3'
MIN
3'
MIN
3'
MIN
The outdoor vent cap kit
The optional outdoor vent cap kit is available from the
appliance manufacturer. The outdoor cap part numbers are
listed by model number. See Table 2F for kit numbers.
Install the outdoor vent cap on the rear of the unit. Complete
installation instructions are included with the outdoor vent
cap kit.
Figure 2-14_Outdoor vent cap installed
TABLE - 2F
MODEL
402
502
652
752
--
30
OUTDOOR VENT CAP KITS
KIT* WITHOUT
KIT* WITH
KIT* WITHOUT
KIT* WITH
MODEL
PUMP COVER PUMP COVER
PUMP COVER PUMP COVER
ODK3748
ODK3052
992
ODK3036
ODK3049
ODK3748
ODK3052
1262
ODK3064
ODK3065
ODK3749
ODK3053
1442
ODK3037
ODK3050
ODK3749
ODK3053
1802
ODK30002
ODK30001
--2072
ODK30002
ODK30001
*These kits include an outdoor vent cap and gasket.
Installation & Operation Manual
3
Gas connections
Connecting to gas supply
Verify that the appliance is supplied with the type of gas specified
on the rating plate. This appliance is configured for operation
up to 4,500 feet altitude. Consult factory for installations above
4,500 feet elevation.
Inlet gas pressure: Measured at the inlet pressure tap on the
appliance gas manifold. The pressure tap is located upstream of
the combination gas valve(s) (FIG. 3-3 on page 33).
Install a manual main gas shutoff valve, outside of the unit gas
connection within six feet of the unit in accordance with the
requirements of the National Fuel Gas Code, ANSI Z223.1.
You must provide a sediment trap (drip leg) in the inlet of the
gas connection to the unit.
CAUTION
See Table 3A for maximum and minimum inlet pressures. Do
not exceed the maximum. Minimum inlet pressure is for the
purpose of input adjustment.
402 - 2072
NATURAL
Max.
Min.
w.c.
w.c.
14.0
4.5
LP
Max.
w.c.
14.0
Min.
w.c.
8.0
Manifold pressure: The gas regulator on the unit’s
combination gas valve is adjustable to supply proper manifold
pressure for normal operation. See the Copper-fin II Service
Manual for net manifold pressure settings.
If you must adjust regulator pressure, follow the instructions
under Gas Manifold Pressure Adjustment in the Copper-fin II
Service Manual. Do not increase regulator pressure beyond
specified pressure setting.
Gas pressure test
1.
2.
3.
Do not block access to the electrical cover
plate when installing the sediment trap.
The sediment trap must be a minimum of
12 inches from the appliance.
The combination gas valves have an integral vent limiting
device and do not require venting to atmosphere, outside the
building. The unit will not operate properly if the reference hose
is removed or a vent to atmosphere is installed.
TABLE 3A
INLET GAS PRESSURE
MODEL
It is the installer’s responsibility to supply
the sediment trap (drip leg).
NOTICE
The appliance must be disconnected from the gas
supply piping system during any pressure testing of that
system at a test pressure in excess of 1/2 PSIG (3.5 kPa).
The appliance must be isolated from the gas supply
piping system by closing a manual shutoff valve during
any pressure testing of the gas supply piping system at
test pressures equal to or less than 1/2 PSIG (3.5 kPa).
Optional gas controls may require routing of bleeds and vents
to the atmosphere, outside the building when required by local
codes.
Gas connection
All gas connections must be made with pipe joint compound
resistant to the action of liquefied petroleum (L.P.) and natural
gases. All piping must comply with local codes and ordinances.
Piping installations must comply with approved standards and
practices.
1. Make sure gas line is a separate line direct from the meter
unless the existing gas line is of sufficient capacity. Verify
pipe size with your gas supplier.
USE WRENCH
TO HOLD
SUPPLY PIPE
COUPLING
12"
MIN
UNION
MANUAL MAIN
SHUT OFF
VALVE
The appliance and its gas connection must be leak
tested before placing it in operation.
Gas piping
To safely operate this unit, you must properly size the gas
supply piping. See Tables 3B through 3D for piping and
fitting requirements. Gas pipe size may be larger than heater
connection.
For ease of service, install a union.
NIPPLE
CAP
Figure 3-1_Gas Line Connection
NOTICE
If an inline high gas pressure regulator is
used, it MUST BE of the lockup type and
be located a minimum of 10 feet from the
appliance. Failure to do so may result in
insufficient gas volume supplied to the
appliance.
31
Installation & Operation Manual
3
Gas connections
2. Use new, properly threaded black iron pipe free from
chips. If you use tubing, make sure the ends are cut
square, deburred and clean. Make all tubing bends smooth
and without deformation. Avoid flexible gas connections.
Internal diameter of flexible lines may not provide unit with
proper volume of gas.
3. Install a manual main gas shutoff valve at the unit’s gas inlet,
outside of the unit.
4. Run pipe or tubing to the unit’s gas inlet. If you use tubing,
obtain a tube to pipe coupling to connect the tubing to the
unit’s gas inlet.
5. Install a sediment trap in the supply line to the unit’s gas
inlet (see FIG. 3-1).
6. Apply a moderate amount of good quality pipe compound
(do not use Teflon tape) to pipe only, leaving two end
threads bare.
8. Connect gas pipe to inlet of unit. Use wrench to support gas
manifold on the unit.
9. For L.P. gas, consult your L.P. gas supplier for expert
installation.
10. Ensure that all air is completely bled from the gas line before
starting the ignition sequence. Start up without properly
bleeding air from the gas line may require multiple reset
functions of the ignition control module to achieve proper
ignition.
Do not have any open flame in proximity to
 WARNING the gas line when bleeding air from the gas
line. Gas may be present.
Gas train and controls
The gas train and controls assembly
provided on this unit have been tested under
the applicable American National Standard
to meet minimum safety and performance
criteria such as safe lighting, combustion
and safety shutdown operation.
402 MODEL
COMBINATION
VALVE
COMBINATION
VALVE
2072 MODEL
DOWNSTREAM
TEST VALVE
402
502
652
752
992
1262
1442
1802
2072
0 - 50
1 1/4"
1 1/4"
1 1/2"
1 1/2"
2"
2"
2 1/2"
2 1/2"
2 1/2"
51 - 100 101 - 200 201- 300 301- 500
1 1/4"
1 1/2"
2"
2"
1 1/2"
2"
2"
2 1/2"
2"
2"
2 1/2"
2 1/2"
2"
2"
2 1/2"
3"
2"
2 1/2"
2 1/2"
3"
2 1/2"
2 1/2"
3"
3"
2 1/2"
3"
3"
3 1/2"
3"
3"
3 1/2"
3 1/2"
3"
3"
3 1/2"
4"
TABLE - 3C
FITTINGS TO EQUIVALENT STRAIGHT PIPE
Diameter
Pipe
3/4
(inches)
Equivalent
length of
2
Straight Pipe
(feet)
1
2
1 1/4 1 1/2
3
4
2
3
4
5
5
10
14
20
Water heater models do not have downstream test valves, but
the rest of the gas train is represented by FIG. 3-2.
Combination gas valves
These units fire in multiple stages of burner input. Each stage
of burner operation has a combination gas valve(s) to cycle
the gas supply on and off and regulate gas to the burners. Each
combination valve consists of a gas regulator and two valve seats
to meet the requirements for redundant gas valves. The valve
has a gas control knob that must remain in the open position
at all times when the unit is in service. The gas control valve
has pressure taps located on the inlet and discharge sides of the
valve. Manifold pressure is adjusted using the regulator located
on the valve. A manifold gas pressure tap for each burner stick
is located on the discharge side of the valve.
The manifold pressure is preset at the factory and adjustment
is not usually required. If you must adjust regulator pressure,
follow the instructions in the Copper-fin II Service Manual.
Venting of combination gas valves
TO BURNERS
DOWNSTREAM
TEST VALVE
TO BURNERS
Figure 3-2_Typical Boiler Gas Train Drawing
32
Distance from Meter (in feet)
MODEL
For each elbow or tee, add equivalent straight pipe to total length from Table 3C.
7. Remove seal over gas inlet to unit.
NOTICE
TABLE 3B
SUGGESTED GAS PIPE SIZE FOR
SINGLE UNIT INSTALLATIONS
The combination gas valve/regulator used on all units is
equipped with an integral vent limiting orifice per ANSI Z21.78.
The vent limiter ensures that the volume of gas emitted from
the valve in the event of a failed gas diaphragm does not exceed
the maximum safe leakage rate allowed by agency requirements.
Installation & Operation Manual
3
Gas connections
(continued)
Combination gas valve/regulators equipped with integral vent
limiters are not required to have vent or relief lines piped to
the outdoors. The termination of the vent limited opening on
the combination gas valve/regulator complies with the safety
code requirements of CSD-1, CF-190(a) as shipped from the
appliance manufacturer without the installation of additional
vent lines.
Checking gas supply pressure
Use the following procedure to check gas supply pressure.
1. Turn the main power switch to the “OFF” position.
2. Turn gas valve knobs to the “OFF” position.
3. Shut off gas supply at the field-installed manual gas cock in
the gas piping to the unit. If fuel supply is L.P. gas, shut off
gas supply at the tank.
4. Remove the 1/8" hex plug, located on the “inlet” side of the
gas valve. You may also use a tapping on the field-installed
main manual gas cock or gas piping. Install a fitting in the
inlet pressure tapping suitable to connect to a manometer
or magnehelic gauge. Range of scale should be 14" w.c. or
greater to check inlet pressure.
5. Turn on gas supply at the manual gas cock, turn on L.P. gas
at the tank if required.
6. Turn the power switch to the “ON” position.
7. Turn the gas valve knobs to the “ON” position. Set the
electronic temperature control or thermostat to call for
heat.
8. Observe the gas supply pressure as all burners are firing.
Ensure that inlet pressure is within the specified range.
See Connecting To Gas Supply, page 31 for minimum and
maximum gas supply pressures.
9. If gas pressure is out of range, contact gas utility, gas
supplier, qualified installer or service agency to determine
necessary steps to provide proper gas pressure to the
control.
10. If gas supply pressure is within normal range, turn the
power switch to the “OFF” position.
11. Turn gas valve knobs to the “OFF” position.
12. Shut off gas supply at the manual gas cock in the gas piping
to the unit. If fuel supply is L.P. gas, shut off gas supply at
the tank.
13. Remove the manometer and related fitting from the “inlet”
side of the gas valve, replace 1/8" hex plug in gas valve and
tighten.
14. Turn on gas supply at the manual valve, turn on L.P. gas at
the tank if required.
15. Turn the power switch to the “ON” position.
16. Turn the gas valve knob to the “ON” position.
17. Set the electronic temperature control or thermostat to call
for heat.
 WARNING
After completing any testing on the gas
system, leak test all gas connections. Apply
a soap/water solution to all gas connections
while main burners are operating. Bubbles
forming indicate a leak. Repair all leaks at
once. Do not operate this unit with a leak in
the gas train, valves or related piping.
Check burner performance by cycling the system while you
observe burner response. Burners should ignite promptly.
Flame pattern should be stable, see Burner Flames in the
Copper-fin II Service Manual. Turn system off and allow
burners to cool, then cycle burners again to ensure proper
ignition and flame characteristics.
SUPPLY
INLET
PRESSURE
TAP
GAS
VALVE
CONTROL
KNOB
INLET
OUTLET
MANOMETER
Figure 3-3_Measuring
Combination Gas Valve
Gas
Supply
Pressure
at
TABLE - 3D
GAS PIPING SIZE CHART
Nominal
Iron Pipe
Size
Inches
10
20
30
40
50
60
70
80
90
100
125
150
175
3/4
369
256
205
174
155
141
128
121
113
106
95
86
79
1
697
477
384
328
292
267
246
256
210
200
179
164
149
1 1/4
1,400
974
789
677
595
543
502
472
441
410
369
333
308
1 1/2
2,150
1,500
1,210
1,020
923
830
769
707
666
636
564
513
472
2
4,100
2,820
2,260
1,950
1,720
1,560 1,440 1,330
1,250
1,180
1,100
974
871
2 1/2
6,460
4,460
3,610
3,100
2,720
2,460 2,310 2,100
2,000
1,900
1,700 1,540 1,400
3
11,200
7,900
6,400
5,400
4,870
4,410 4,000 3,800
3,540
3,300
3,000 2,720 2,500
4
23,500 16,100 13,100 11,100 10,000 9,000 8,300 7,690
7,380
6,870
6,150 5,640 5,130
Length of Pipe in Straight Feet
Maximum
Capacity of Pipe
in Thousands of
200 Btu/hr per hour
for gas pressures
74
of 14 Inches
138
Water Column
287 (0.5 PSIG) or less
and a pressure
441
drop of 0.5 Inch
Water Column
820
(Based on NAT
1,300 GAS, 1025 Btu/hr
2,340 per Cubic Foot
of Gas and 0.60
4,720 Specific Gravity)
33
Installation & Service Manual
4
Water connections
Inlet and outlet connections
For ease of service, install unions on the water inlet and
water outlet of the unit. The connection to the unit marked
“Inlet” on the header should be used for return from the
system. The connection on the header marked “Outlet” is
to be connected to the supply side of the system.
2" NPT
WATER
INLET
2" NPT
WATER
OUTLET
Initial set-up of maximum water flow
On initial start-up of the Copper-fin II, the maximum water
flow to the heat exchanger must be checked and manually
limited with a valve or bypass before normal operation begins.
 CAUTION
An appliance allowed to operate at return
temperatures below the specified minimum
setting may experience problems with
the operating controls, safety switches,
obstruction of the flue gas passages on the
heat exchanger, incomplete combustion
and possible flue gas spillage. Sustained
operation at lower than specified water
temperatures (140°F) may cause hazardous
conditions that may result in personal injury
or non-warrantable damage to the appliance.
Water flow switch
INSPECTION
PLUGS
Figure 4-1_Water Connections - Models 402 - 752
2-1/2" NPT
WATER
INLET
2-1/2" NPT
WATER
OUTLET
A water flow switch is factory installed in the outlet on all
heating boilers and water heaters. The flow switch must prove
water flow before a trial for ignition can begin. The flow switch
requires a minimum flow of 15 - 18 GPM on Models 402 - 752
and 26 GPM on Models 992 - 2072 to make the flow switch and
start burner operation. A water flow switch meets most code
requirements for a low water cutoff device on boilers requiring
forced circulation for operation. A fault message, Flow Sw/
LWCO will be indicated in the Operator Interface on a low
water flow condition as sensed by the flow switch.
Low water cutoff
INSPECTION
PLUGS
Figure 4-2_Water Connections - Models 992 - 2072
Heat exchanger
This appliance uses a finned copper tube heat exchanger
to maximize the heat transfer process. The heat exchanger
is mounted in the inner jacket of the appliance. A series
of “V” shaped baffles are installed between the individual
tubes to control the movement of the flue products over
the finned copper surface and increase heat transfer. Water
enters the heat exchanger and makes two passes over the
area exposed to direct heat from the burner. A circulating
pump MUST be installed to ensure proper water flow over
the heat transfer surfaces during burner operation. Water
temperatures in the heat exchanger are determined by water
flow.
34
(if equipped)
If this boiler is installed above radiation level, a low water cutoff
device must be installed at the time of boiler installation. An
electronic low water cutoff is available as a factory supplied
option on all models. The low water cutoff should be inspected
every 6 months. A fault message, Flow Sw/LWCO will be
indicated in the Operator Interface on a low water condition as
sensed by the low water cutoff.
Installation & Operation Manual
4
Water connections
(continued)
Relief valve
This unit is supplied with a relief valve(s) sized in accordance
with ASME Boiler and Pressure Vessel Code, Section IV
(“Heating Boilers”). The relief valve(s) is installed in the vertical
position and mounted in the hot water outlet. No valve is to be
placed between the relief valve and the unit. To prevent water
damage, the discharge from the relief valve shall be piped to a
suitable floor drain for disposal when relief occurs. No reducing
couplings or other restrictions shall be installed in the discharge
line. The discharge line shall allow complete drainage of the
valve and line. Relief valves should be manually operated at
least once a year.
 CAUTION
Avoid contact with hot discharge water.
Heating boiler installations
Piping of the boiler system
The drawings in this section show typical boiler piping
installations, see FIG.’s 4-3 through 4-6. Before beginning
the installation, consult local codes for specific plumbing
requirements. The installation should provide unions and
valves at the inlet and outlet of the boiler so it can be isolated
for service. An air separation device must be supplied in the
installation piping to eliminate trapped air in the system.
Locate a system air vent at the highest point in the system. The
system must also have a properly sized expansion tank installed.
Typically, an air charged diaphragm-type expansion tank is
used. The expansion tank must be installed close to the boiler
and on the suction side of the system pump to ensure proper
operation.
 CAUTION
The boiler system should not be operated at
less than 12 PSIG.
Hot water piping must be supported by suitable hangers or floor
stands, NOT by the boiler. Copper pipe systems will be subject
to considerable expansion and contraction. Rigid pipe hangers
could allow the pipe to slide in the hanger resulting in noise
transmitted into the system. Padding is recommended on rigid
hangers installed with a copper system. The boiler pressure
relief valve must be piped to a suitable floor drain. See the Relief
Valve section on this page.
 CAUTION
A leak in a boiler “system” will cause the
“system” to intake fresh water constantly,
which will cause the tubes to accumulate a
lime/scale build up. This will cause a nonwarrantable failure.
Water connections (heating boilers only)
Models 402 - 752 have 2" NPT inlet and outlet connections and
Models 992 - 2072 have 2 1/2" NPT inlet and outlet connections.
 CAUTION
Field installed reducing bushings must not
be used.
Any reduction in pipe size may decrease flow resulting in high
water temperatures, boiler noise, flashing to steam, and nonwarrantable heat exchanger damage.
The boiler may be installed with a primary/secondary piping
system provided to the boiler. It is important to guarantee that
adequate flow is provided to properly dissipate heat from the
boiler and also ensure that flow through the boiler does not
exceed the maximum recommended flow rate of 55 GPM for
Models 402 - 752 and 90 GPM for Models 992 - 2072 for a boiler
equipped with a copper heat exchanger.
Boiler circulator requirements
This is a low mass, high efficiency hot water boiler which
must have adequate flow for quiet, efficient operation. Pump
selection is critical to achieve proper operation. A pump should
be selected to achieve proper system design water temperature
rise. Pipe diameter and length are critical to ensure proper flow
through the boiler. A System Temperature Rise Chart (Table 4C
on page 38) is provided to assist in proper pump selection. This
table provides GPM and boiler head-loss at various temperature
rises for each model based on Btu/hr input. Temperature rise
is the difference in boiler inlet temperature and boiler outlet
temperature while the boiler is firing at full rate.
Example: The boiler inlet temperature is 160°F (71.1°C) and
the boiler outlet temperature is 180°F (82.2°C). This means that
there is a 20°F (11.1°C) temperature rise across the boiler. The
boiler temperature rise is visible in the Operator Interface on the
boiler’s front control panel.
Circulator pump specifications
1.
2.
3.
4.
Maximum operating pressure for the pump must exceed
system operating pressure.
Maximum water temperature should not exceed the
nameplate rating.
Cast iron circulators may be used for closed loop systems.
A properly sized expansion tank must be installed near the
boiler and on the suction side of the pump.
Circulator pump operation (heating boilers only)
The boiler pump must run when the boiler is firing. Separate
supply circuits can be provided or the two circuits (pump
and controls) can be combined for connection to one circuit,
properly sized for both.
Pump delay operation
A pump delay operation feature is provided. The boiler’s
circulating pump will cycle on at each call for heat, before the
burner fires. The pump will continue to operate while the
burner is firing. The pump will run for a 30 second period after
the temperature set point is satisfied. This timing is selectable
from the Operator Interface. This timing will remove any of the
residual heat from the combustion chamber before turning the
pump off. See the wiring diagram in Section 9 of this manual.
35
Installation & Service Manual
4
Water connections
Pump Maintenance: Inspect the pump every six (6) months
and oil as necessary. Use SAE 30 non-detergent oil or lubricant
specified by the pump manufacturer.
The boiler is recommended for installation in a primary/
secondary piping system. This type of system uses a separate
boiler circulating pump to supply flow to and from the boiler
only. The secondary pump is sized based on the head loss of the
boiler and related pipe and fittings in the secondary loop only.
A properly sized primary system pump provides adequate
flow to carry the heated boiler water to radiation, air over
coils, etc. The fittings that connect the boiler to the primary
system should be installed a maximum of 12 inches (0.30m)
(or 4 pipe diameters) apart to ensure connection at a point of
zero pressure drop in the primary system. There should be a
minimum of 10 pipe diameters of straight pipe before and after
the boiler secondary loop connections to prevent turbulent
flow at the secondary loop connections. The secondary loop
piping to and from the boiler must have a fully ported ball valve
installed in both the supply and return side piping. The ball
valves must be fully ported having the same inside diameter as
the installed piping. The ball valve in the piping supplying water
to the boiler will only be used as a service valve. The ball valve
installed in the discharge from the boiler back to the primary
system will be used to adjust boiler flow and temperature rise to
ensure proper performance.
Low Temperature Return Water Systems
Any non-condensing boiler will develop operational problems
when exposed to inlet water temperatures below 140°F.
Lochinvar offers a low temperature protection valve (LTV)
that is factory preset to maintain 140°F inlet water to the boiler
regardless of the system return water temperature. See Table 4A
for available valve kits.
TABLE 4A
LTV VALVE KITS
MODEL
LTV VALVE KIT
402 - 752
VAL3048
992 - 2072
VAL3047
Low temperature bypass requirements
To prevent condensation problems, a boiler MUST NOT be
operated (other than for brief periods during initial system
startup) with an inlet water temperature of less than 140°F
(60°C). If normal system return temperatures are less than the
required 140°F (60°C) boiler inlet requirement, a method of
low return water temperature protection MUST BE provided
to protect the boiler.
The boiler primary piping system must have a circulator
installed in the main system loop to carry the heated boiler
water to the point of use in the main system.
For Example: Night Setback of the system loop water
temperature, Night Shutdown and Weekend Shutdown of the
entire boiler / heating system, and Indoor / Outdoor Air Reset
of the system loop water temperature. If any of these control
functions are being utilized, some type of low return water
protection MUST BE provided.
Multiple boilers may also be installed with a primary/secondary
manifold system. Multiple boilers should be connected to the
common manifold in reverse return to assist in balancing flow
to multiple boilers.
If the boiler heating system will be used on a Water Source Heat
Pump System, Radiant Floor Heating System, Snow Melting
Heating System, etc., some type of low return water protection
must be provided.
The installer must ensure that the boiler has adequate flow
without excessive temperature rise. Low system flow can result
in overheating of the boiler water which can cause short burner
cycles, system noise, relief valve discharge and in extreme cases,
a knocking flash to steam. These conditions indicate the need
to increase boiler flow to and from the boiler. This is generally
accomplished by either increasing the size of the boiler pump or
by increasing the diameter of the piping that connects the boiler
to the primary system. A larger diameter pipe reduces head loss
and increases flow.
At no time should the system pressure be less
 CAUTION
than 12 PSIG.
Condensation can cause operational problems, bad combustion,
sooting, flue gas spillage and reduced service life of the vent
system and related components.
Minimum boiler water temperatures
Inlet water temperatures below the specified minimum of
140°F (60°C) can excessively cool the products of combustion
resulting in condensation on the heat exchanger. Condensation
on the heat exchanger can cause operational problems, bad
combustion, sooting, flue gas spillage and reduced service life
of the related components. See the Low Temperature Bypass
Requirements section for boiler system applications below the
minimum specified temperature.
36
To prevent system return water temperature below 140°F (60°C)
from entering the boiler inlet, an electrically actuated 3-way
mixing valve (VAL30002) is available, consult manufacturer for
kit availability (see FIG. 4-5 on page 41). By using this valve,
the SMART SYSTEM control will bypass outlet water back into
the inlet of the boiler to maintain the inlet temperature above
140°F (60°C).
A fast acting, self contained mixing valve, set to 140°F (60°C),
may also be used. The installation of this valve must be done as
shown in FIG. 4-5. This arrangement will maintain the required
flow through the boiler.
Installation & Operation Manual
4
Water connections
(continued)
When a mixing valve is used, an optional system return sensor
should be installed into the system return piping. This will allow
the display of the actual system return temperature, and will
also allow control of the system return temperature when the
SMART SYSTEM control is programmed for inlet temperature
control. As always, installation of the system supply sensor is
strongly recommended as well. This will reduce the potential
for short cycling of the boiler, and provide more responsive
temperature regulation, even when the SMART SYSTEM
control is programmed for inlet temperature control.
 CAUTION
A boiler allowed to operate at set point
temperatures below the specified minimum
settings may experience operational
problems with the operating controls
and safety switches, obstruction of the
flue gas passages on the heat exchanger,
incomplete combustion and possible flue gas
spillage. Operation at lower than specified
water temperatures may cause hazardous
conditions that result in non-warrantable
damage to the appliance.
Three way valves in system
The installation of a three way valve on this boiler is not
generally recommended because most piping methods allow
the three way valve to vary flow to the boiler. This boiler is a
low mass, high efficiency appliance which requires a constant
water flow rate for proper operation. Low flow rates can
result in overheating of the boiler water which can cause
short burner cycles, system noise, relief valve discharge and in
extreme cases, a knocking flash to steam. These conditions
can cause operational problems and non-warrantable failures
of the boiler.
Radiant floor and snow melt heating
systems
This type of heating boiler application operates in a low
temperature range which requires a boiler bypass as described
under the Low Temperature Bypass Requirements section. A
non-metallic rubber or plastic tubing installed in a radiant (in
floor) system must have an oxygen barrier to prevent oxygen
from entering the system through the walls of the installed
tubing. Excessive oxygen absorption into the system will result
in an accelerated rate of corrosion causing a sludge buildup.
This excessive corrosion will also damage the boiler and system
components. Sludge formed as the result of excessive oxygen
in the system can restrict water flow resulting in a premature
boiler failure. Any boiler damage due to excessive oxygenation
is non-warrantable.
TABLE - 4B
MAXIMUM FLOW FOR HEATING BOILER
The maximum flow rate through the boiler with a copper
heat exchanger must not exceed the following:
Model
Maximum Flow
402, 502, 652, and 752
55 GPM
992, 1262, 1442, 1802, and 2072
90 GPM
If higher flow rates are required through the boiler, an optional
Cupro-Nickel heat exchanger is available. Consult the factory
for specific application requirements.
Low system water volume
System run time is very important to the overall operating
efficiency of the boiler. Short cycling of the boiler creates
problems with condensation in the vent stack, condensation on
the heat exchanger, system temperature spikes, and mechanical
component failures. To prevent short cycling of the boiler, it
is important to limit the boiler cycles to six or fewer per hour.
A buffer tank is an effective way to enhance a small system load
and increase heating system efficiency (see FIG. 4-6 on page 42
of this manual). Buffer tanks add water volume to the system
and act as a flywheel to absorb the additional Btu’s provided by
the boiler when only a single zone of a large system is calling
for heat.
To calculate the proper buffer tank size for a multiple zone
system:
(Run Cycle) (Output - Minimum System Load)
(Temp. Rise) (8.33) (60 Min.)
CFN2072
Min. Load = 100,000 Btu/Hr
Min. Boiler Output = 850,000 Btu/Hr
Cycle Time = 10 Min
Temp. Rise = 38
(10)(850,000 – 100,000) / (38)(8.33)(60) = 395 Gallons
37
Installation & Service Manual
4
Water connections
TABLE - 4C
SYSTEM TEMPERATURE RISE CHART
Temperature Rise and Head Loss Based on Boiler Output in Btu/hr
Btu/hr
30°F T
35°F T
40°F T
Input
Output
399,999
339,999
23
1.1
19
0.7
--
--
500,000
425,000
28
1.6
24
1.2
21
650,000
552,500
37
3.0
31
2.2
750,000
637,500
42
4.1
36
990,000
841,500
55
2.6
1,260,000 1,071,000
71
1,440,000 1,224,000
81
GPM Ft/hd GPM Ft/hd GPM Ft/hd GPM
1,800,000 1,530,000 102*
2,070,000 1,759,500
45°F T
--
50°F T
55°F T
60°F T
Ft/hd
GPM
Ft/hd
GPM
Ft/hd
GPM Ft/hd
--
--
--
--
--
--
--
--
0.7
19
0.7
--
--
--
--
--
--
28
1.6
24
1.2
22
0.9
20
0.7
18
0.6
2.8
32
2.3
28
1.6
25
1.3
23
1.1
21
0.7
48
2.3
42
1.5
37
1.4
33
1.0
30
0.9
28
0.9
4.4
61
3.6
53
2.7
48
2.3
42
1.7
39
1.5
35
1.2
6.3
70
5.0
61
3.8
54
2.7
48
2.3
44
2.0
40
1.8
11.8
87
9.0
76
6.6
68
5.6
61
4.4
55
2.6
50
3.0
--
100*
10.1
87
9.0
78
7.6
70
6.2
64
5.4
58
4.6
*Cupro-Nickel Heat Exchanger Required at Flows Above 55 GPM on Models 402 - 752 and above 90 GPM on Models 992 - 2072.
TABLE - 4D
BOILER TEMPERATURE RISE AT MAXIMUM FLOW
Temperature Rise at Full Rate Fire, 55 and 90 GPM
Maximum Flow
Model
Temperature Rise °F
402
12 @ 55 GPM
502
15 @ 55 GPM
652
20 @ 55 GPM
752
23 @ 55 GPM
992
19 @ 90 GPM
1262
24 @ 90 GPM
1442
27 @ 90 GPM
1802
34 @ 90 GPM
2072
39 @ 90 GPM
Boiler bypass requirements
The installer must ensure that the boiler is supplied with adequate
flow without excessive temperature rise. It is recommended
that this boiler be installed with a bypass in the piping if the
maximum recommended flow rate is exceeded. The bypass will
help to ensure that the boiler can be supplied with adequate
water flow. Flow rates exceeding the maximum recommended
flow will result in erosion of the boiler tubes. A typical bypass
with a valve as shown in FIG. 4-5 will allow control of boiler
flow.
Temperature / pressure gauge
This boiler is equipped with a dial type temperature / pressure
gauge. This gauge is factory installed in the outlet side of the
boiler piping. The gauge has one scale to read system pressure
and a separate scale to read water temperature in degrees
Fahrenheit. The temperature / pressure gauge is provided to
meet code requirements. Water temperatures can be more
accurately monitored from the data provided in the digital
display in the Operator Interface.
38
Typical heating boiler installations
General plumbing rules:
1.
Check all local codes.
2.
For serviceability of boiler, always install unions.
3.
Always pipe pressure relief valve to an open drain.
4.
Locate system air vents at highest point of system.
5.
Expansion tank must be installed near the boiler and
on the suction side of the system pump.
6.
Support all water piping.
Installation with a chilled water system
Pipe refrigeration systems in parallel. Install duct coil
downstream at cooling coil. Where the hot water heating
boiler is connected to a heating coil located in the air handling
units which may be exposed to refrigeration air circulation, the
boiler piping system must be equipped with flow control valves
or other automatic means to prevent gravity circulation of the
boiler water during the cooling cycle.
The coil must be vented at the high point and hot water from the
boiler must enter the coil at this point. Due to the fast heating
capacity of the boiler, it is not necessary to provide a ductstat to
delay circulator operation. Also, omit thermostat flow checks
as the boiler is cold when heating thermostat is satisfied. This
provides greater economy over maintaining standby heat.
DHW installation
Boilers may be utilized with a Hot Water Generator tank
for domestic hot water. When used for DHW, either a tank
thermostat or sensor must be installed in a bulbwell within the
tank and connected back to the unit in order for the controller
to regulate water temperature and a pump for DHW. Pumps
used for DHW purposes should be sized to provide adequate
flow to the boiler when in DHW Mode. Reference FIG. 4-3
shown with a Hot Water Generator for DHW on page 39 for a
typical DHW piping scheme.
Installation & Operation Manual
4
Water connections
(continued)
Figure 4-3_Primary/Secondary Piping of a Single Boiler w/DHW
COMMON MANIFOLD SIZE (Min.)
Models: 992, 1262, 1442, 1802 & 2072
Diameter
Number of Units
GPM
(in.)
1
90
2 1/2
COMMON MANIFOLD SIZE (Min.)
Models: 402, 502, 652, & 752
Diameter
Number of Units
GPM
(in.)
1
55
2
TO EXPANSION
TANK AND MAKEUP
WATER SYSTEM
HEATING
RETURN
LOOP
TO
FLOOR
DRAIN
12"
MAX
HOT WATER
GENERATOR
NOTICE
HEATING
SUPPLY
LOOP
Please note that these illustrations are meant to show system piping concept only, the installer is responsible
for all equipment and detailing required by local codes.
39
Installation & Service Manual
4
Water connections
Figure 4-4_Primary/Secondary Piping of Multiple Boilers
COMMON MANIFOLD SIZE (Min.)
Models: 402, 502, 652, & 752
Diameter
Number of Units
GPM
(in.)
2
110
3
COMMON MANIFOLD SIZE (Min.)
Models: 992, 1262, 1442, 1802 & 2072
Diameter
Number of Units
GPM
(in.)
2
180
4
3
165
3 1/2
3
270
5
4
220
4
4
360
6
5
275
5
5
450
6
6
330
5
6
540
6
7
385
6
7
630
8
8
440
6
8
720
8
PRESSURE
RELIEF
VALVE
EXPANSION
TANK
LOW WATER
CUT-OFF
(OPTIONAL)
MAKE-UP
WATER
TO SYSTEM
AIR
SEPARATOR
12" OR 4X
PIPE DIAMETERS
SYSTEM
PUMP
FROM
SYSTEM
SECONDARY
BOILER
PUMP
NOTICE
40
Please note that these illustrations are meant to show system piping concept only, the installer is responsible for
all equipment and detailing required by local codes.
Installation & Operation Manual
4
Water connections
(continued)
Figure 4-5_Boiler with Low Temperature Bypass Piping - Using a Low Temperature Valve Required for Systems
Operating at less than 140°F (60°C) Return Water Temperatures from the Heating Return Loop
COMMON MANIFOLD SIZE (Min.)
Models: 402, 502, 652, & 752
Diameter
Number of Units
GPM
(in.)
1
55
2
COMMON MANIFOLD SIZE (Min.)
Models: 992, 1262, 1442, 1802 & 2072
Diameter
Number of Units
GPM
(in.)
1
90
2 1/2
TO EXPANSION
TANK AND MAKEUP
WATER SYSTEM
MIXING
VALVE
HEATING
RETURN
LOOP
TO
FLOOR
DRAIN
12"
MAX
HEATING
SUPPLY
LOOP
NOTICE
Please note that these illustrations are meant to show system piping concept only, the installer is responsible
for all equipment and detailing required by local codes.
41
Installation & Operation Manual
4
Water connections
Figure 4-6_Primary/Secondary Piping with Buffer Tank
COMMON MANIFOLD SIZE (Min.)
Models: 992, 1262, 1442, 1802 & 2072
Diameter
Number of Units
GPM
(in.)
2
180
4
COMMON MANIFOLD SIZE (Min.)
Models: 402, 502, 652, & 752
Diameter
Number of Units
GPM
(in.)
2
110
3
3
165
3 1/2
3
270
5
4
220
4
4
360
6
5
275
5
5
450
6
6
330
5
6
540
6
7
385
6
7
630
7
8
440
6
8
720
7
PUMP
1" TEMPERATURE
AND PRESSURE
GAUGE
AUTOMATIC AIR
ELIMINATOR/VENT
SYSTEM
OUTLET
COMMOM MANIFOLD
MUST BE SIZED TO
ACCOMODATE COMBINED
FLOW RATE FOR
ALL BOILERS
SYSTEM
SENSOR
LOCATION
SYSTEM
INLET
BUFFER
TANK
DRAIN
NOTICE
The Inlet/Outlet System tappings are shown in the optional location on the side of the tank for pictorial purposes.
The standard location for the system tappings is 180° from the recirculation tappings.
NOTICE
Please note that these illustrations are meant to show system piping concept only, the installer is responsible for
all equipment and detailing required by local codes.
42
Installation & Operation Manual
5
Electrical connections
Boiler operating control module
The operating control for the appliance is the SMART
SYSTEM control module. It is located on the inside of the
control panel, behind the front access door. Access to adjust
the temperature set point and other user adjustable points
is made through the Operator Interface located on the front
access door. The outlet sensor is installed in the outlet side of
the heat exchanger top header. The inlet sensor is located on
the inlet side of the heat exchanger top header.
The operating sensor, inlet or outlet, is selectable from the
screen in the Operator Interface.
The exact temperature set point is based on the system’s
requirements. Set the control set point(s) to the desired
operating water temperature.
The maximum temperature set point that can be programmed
into the control module from the Operator Interface on a
heating boiler is 220°F (104.4°C). The manual reset high
limit control for a heating boiler is adjustable up to a fixed
maximum setting of 230°F (110°C).
The maximum temperature set point for a water heater is
190°F (88°C). The auto reset high limit is fixed at 200°F
(93°C), and the adjustable manual reset high limit has a
maximum setting of 230°F (110°C).
TABLE - 5A
AMP DRAW DATA
Model Controls
1.
All wiring between the appliance and field installed
devices shall be made with type T wire [63°F (35°C)
rise].
2.
All line voltage wire exterior to the appliance must be
enclosed in approved conduit or approved metal clad
cable.
3.
The circulating pump must run continuously when
the appliance is being fired.
4.
To avoid serious damage, DO NOT energize the
appliance until the system is full of water. Ensure that
all air is removed from the heat exchanger and piping
before beginning initial operation. Serious damage
may result if the appliance is operated without proper
flow.
5.
Provide the appliance with proper overload protection.
Pump
FLA*
Approximate Total
Amps @ 120 VAC
402
3.6
2.7
5.8
12.1
502
3.6
2.7
5.8
12.1
652
5.4
3.4
5.8
14.6
752
5.4
3.4
5.8
14.6
992
7.3
3.2
7.4
17.9
1262
7.3
3.2
7.4
17.9
1442
7.3
6.7
7.4
21.4
1802
7.3
6.7
7.4
21.4
2072
7.3
6.7
7.4
21.4
*Standard Pump Supplied with Water Heaters Only
 WARNING
NOTICE
ELECTRICAL SHOCK HAZARD – For your
safety, turn off electrical power supply before
making any electrical connections to avoid
possible electric shock hazard. Failure to do
so can cause severe personal injury or death.
Wiring must be N.E.C. Class 1.
If original wiring as supplied with the boiler
must be replaced, use only type 105°C wire
or equivalent.
A 120 VAC, 15 Amp, 1 ph, 60 Hz circuit is required for
operation of the appliance controls.
The appliance, when installed, must be electrically grounded
in accordance with the requirements of the authority having
jurisdiction or in the absence of such requirements, with
the latest edition of the National Electrical Code ANSI/
NFPA No. 70. When the unit is installed in Canada, it must
conform to the CAE C22.1, Canadian Electrical Code, Part I
and/or local Electrical Codes. Multiple units connected in a
Cascade must be grounded to the same ground connection.
Blower
Boiler must be electrically grounded as
required by National Electrical Code ANSI/
NFPA 70 – latest edition.
 CAUTION
Label all wires prior to disconnection when
servicing controls. Wiring errors can cause
improper and dangerous operation.
Installation must comply with:
1. National Electrical Code and any other national, state,
provincial, local codes, or regulations.
2. In Canada, CSA C22.1 Canadian Electrical Code Part 1,
and any local codes.
43
Installation & Operation Manual
5
Electrical connections
Line voltage connections
EMS or remote thermostat connection
1. Connect 120 VAC power wiring to the line voltage
terminal strip in the junction box, as shown in FIG. 5-1.
2. Provide and install a fused disconnect or service switch
(15 AMP recommended) as required by the code (see
FIG. 5-1).
3. To activate a system pump, wire as shown in FIG. 5-1. If
the motor is larger than 1 HP, you must install a contactor.
4. When connecting power to units which are to be
cascaded, each unit must be connected to the same ground
connection.
BOILER ONLY
SYSTEM
UNIT PUMP
DHW PUMP
SUPPLY PUMP SUPPLY SUPPLY
UNIT
SUPPLY
L
N G
D
I
S
C
O
N
N
E
C
T
An EMS, remote thermostat or other remote temperature
control may be connected to the boiler (see FIG. 5-3).
Follow the manufacturer’s instructions supplied with
the remote temperature control for proper installation
and adjustment. Connection of a set of dry switching
contacts or a remote on/off thermostat to the low voltage
connection board will allow the unit to be switched
on and off by making or breaking a 24 VAC control
circuit. Remove the factory jumper between the Staging
S1 terminals on the low voltage connection board and
connect the remote temperature control in its place, see
FIG. 5-4 on page 46.
L
N G
L
N G
D
I
S
C
O
N
N
E
C
T
D
I
S
C
O
N
N
E
C
T
BOILER
PUMP
L
Ensure that all wiring used to connect the switching
contacts of the remote temperature controller to the
connection board are a minimum of 18 gauge and have
a maximum installed length of 300 feet (91.4m). Set
the SMART SYSTEM control to a set point temperature
slightly higher than the setting of the remote temperature
control. This will ensure that the remote temperature
controller functions as the operating control for the
heater.
N G
D
I
S
C
O
N
N
E
C
T
SYSTEM
PUMP
DHW
PUMP
120V
RELAY
120V
RELAY
GROUND
SPLICE
L
N
120V
SUPPLY
R
UNIT
PUMP
1 HP MAX
R
LBL20175 REV A
CHASSIS
GROUND
REMOTE
ON/OFF
CONNECTION
DHW
SYSTEM
PUMP
PUMP
RELAY COIL RELAY COIL
Figure 5-1_Line Voltage Field Wiring Connections
Low voltage connections
1. Route all low voltage wires through the knockouts on the left
side of the heater, as shown in FIG. 5-2.
2. Connect low voltage wiring to the low voltage connection board
as shown in FIG. 5-4 on page 46 of this manual and the heater
wiring diagram.
Figure 5-3_Remote ON/OFF Wire Connection
DHW (Domestic Hot Water) thermostat
LOW
VOLTAGE
KNOCKOUTS
Connect the DHW tank thermostat (FIG. 5-4) to the tank
thermostat terminals on the connection board.
DHW tank sensor
LINE
VOLTAGE
KNOCKOUTS
Figure 5-2_Routing Field Wiring
44
If a tank sensor is used, it must be connected to the tank
sensor terminals on the low voltage connection board. The
correct Lochinvar sensor (TST20015) MUST BE USED.
Installation & Operation Manual
5
Electrical connections
(continued)
Louver relay
Runtime contacts
When the heater is to control combustion air louvers, a field
provided 24VAC louver relay must be installed. Connect
the Louver Relay Coil terminals to the louver relay coil.
The SMART SYSTEM control closes a set of dry contacts
whenever the burner is running. This is typically used by
Building Management Systems to verify that the boiler is
responding to a call for heat.
Louver proving switch
The operation of a louver proving switch needs to be
verified before the boiler fires. Remove the jumper wire
from these terminals and connect them to the normally
open contacts on its proving switch (FIG. 5-4).
System supply sensor (recommended use)
3-way valve out
An electric 3-way mixing valve may be used when the return
temperature to the heater is less than 140°F (60°C). Connect the
Open output to the Open terminal on the 3-way valve. Connect
the Close output to the Close terminal on the valve and the
COM output to the 24VAC terminal on the valve.
1. By installing the system supply sensor into the supply
of the primary loop, the temperature of the primary
supply can be controlled. The SMART SYSTEM control
automatically detects the presence of this sensor, and
controls the boiler firing rate to maintain the system
supply temperature to the set point (if the outlet sensor
control is currently selected).
0 - 10V rate out
2. Connect these terminals to the system supply sensor
(FIG. 5-4).
0 - 10V system pump in
System return sensor (optional use)
A 0 - 10VDC input is available so that the boiler can monitor the
speed of a variable speed system pump. This allows the boiler to
anticipate changes in the heat load as the system flow changes.
Connect the (-) terminal to the (-) or common terminal on the
system pump VFD drive, and the (+) terminal to the (+) or 0 10VDC terminal on the system pump VFD drive. A 0 - 020mA
signal may also be used, by adding a 500 ohm resistor between
the (+) and (-) terminals.
1. By installing the system return sensor into the return
of the primary loop, the temperature of the primary
return can be sensed when a 3-way valve or other
device is installed ahead of the heater inlet. The
SMART SYSTEM control automatically senses the
presence of this sensor. If the inlet sensor is selected
as the controlling sensor, the SMART SYSTEM control
will adjust the firing rate to hold the system return
temperature to the set point. In this case, a system
supply sensor must be installed for proper operation.
2. Connect these terminals to the system return sensor
(FIG. 5-4).
Boiler Management System (BMS)
1. An external control may be connected to control either
the firing rate or the set point of the appliance (boiler or
water heater). Connect the 0 - 10 VDC terminals to the
0 - 10 VDC output of the external control. The SMART
SYSTEM control can be programmed to use the enable
output of the Boiler Management System, or use the
voltage signal to enable the heater. Connect the Staging
S1 or tank thermostat terminals to the enable output of
the BMS, when used.
A 0 - 10VDC signal is available to allow a Building Management
System (BMS) to monitor the firing rate of the heater. Make
sure the (-) terminal is connected to the (-) or common terminal
of the external control, and the (+) terminal is connected to the
(+) or Vdc terminal of the external control.
Sequencer
The individual stages in the heater can be controlled separately
with an external sequencer. Connect the Staging S1 terminals
to the first stage contacts on the sequencer, the Staging S2
terminals to the second stage contacts, and so forth. Note that
the sequencer must enable the stages in order, with Stage 1 first,
Stage 2 second and so on.
Alarm contacts
The SMART SYSTEM control closes another set of contacts
whenever the heater is locked out or the power is turned off.
This can be used to turn on an alarm, or signal a Building
Management System that the boiler is down.
2. Make sure the ground terminal is connected to the
ground output terminal of the external control, and the
0 - 10 V BMS IN terminal is connected to the 0 - 10 VDC
terminal of the external control.
45
Installation & Operation Manual
5
Electrical connections
If outdoor air reset is desired, the outdoor air sensor should
be wired to the low voltage connection board at the terminals
marked for the outdoor air sensor (FIG. 5-4). If the outdoor
air sensor is connected, the Leader control will calculate the
water temperature set point based on the programmed reset
curve parameters. If the outdoor air sensor is not connected, the
Leader control will maintain the space heating (SH) set point
that is programmed into the control.
If a Thermostat, Zone Control enable output, or Building
Management System enable output are available, it should be
wired to the low voltage connection board on the Leader boiler
at the Staging S1 terminals. If the boilers are to run continuously,
leave the jumper wire between these terminals. This will initiate
a call for heat on the Cascade. Also, leave the jumpers on the
Staging S1 terminals of all the Member heaters. This will allow
them to run independently should the Leader heater fail.
On water heaters, connect the tank thermostat or BMS enable
output to the low voltage connection board on the Leader
heater, at the terminals marked for the tank Aquastat. If a tank
sensor is used, connect this sensor to the low voltage connection
board on the Leader heater, at the terminals marked for the tank
sensor.
TO MONITORING DEVICE
THREE WAY
VALVE
S1
EXTERNAL
STAGING
SEQUENCER
LOUVER
PROVING
SWITCH
S3
S4
LINE
TO LOUVER
DHW TANK
THERMOSTAT
10K-TANK
SENSOR
FROM
PREVIOUS
HEATER
TO NEXT
HEATER
S2
1
ALARM
2
CONTACTS
3
RUN-TIME
4
CONTACTS
5
OPEN
6
CLOSE
7
COM
8
S1
9
S1
10
S2
11
S2
12
S3
13
S3
14
S4
15
S4
16
LOUVER
17
PROVING SW
18
LOUVER
19
RELAY COIL
20
TANK
AQUASTAT
21
CN3
22
TANK
23
SENSOR
24
SHIELD
B
25
A
A
26
B
27
SHIELD
28
+ 0-10V
29
- BMS IN
30
+ 0-10V
31
- RATE OUT
32
SHIELD
33
A
34
B
A
B
EXTERNAL
SEQUENCER/
BUILDING
AUTOMATIC
CONTROL
SHIELD
35
CN2
(BOILER ONLY)
OUTDOOR
AIR SENSOR
OUTDOOR
Communication between the Leader heater and the Member
heaters is accomplished by using shielded, 2-wire twisted pair
communication cable. Connect one of the twisted pair wires to
terminal A on each of the low voltage connection boards, and
the other wire of the twisted pair to terminal B on each of the
low voltage connection boards. Connect the shield wire to the
shield ground terminal on all of the heaters. If more than two
heaters are on the Cascade, daisy chain the wiring from the
Cascade terminals on the second heater to the Cascade terminals
on the third heater, then from the third to the forth, and so
on. The connections can be made in any order, regardless of
the addresses of the heaters. Try to keep each cable as short as
possible.
46
SENSOR
SYSTEM SUPPLY
SENSOR
SYS SUPPLY
SYSTEM RETURN
SENSOR
SYS RETURN
PUMP SPEED
INPUT
3-WAY
VALVE
TO MONITORING DEVICE
STAGING
On boilers, connect the system supply sensor and outdoor air
sensor (if used) to the Leader boiler. The location of the system
supply sensor should be downstream of the boiler connections
in the main system loop (FIG.’s 4-3 and 4-6). The system supply
sensor should be wired to the low voltage connection board at
the terminals marked for the system supply sensor (see FIG.
5-4). The Leader control will use the water temperature at the
system supply sensor to control the operation of the Cascade.
Figure 5-4_Low Voltage Field Wiring Connections
SENSOR
SENSOR
0-10VDC
COMMON
+ 0-10V SYS
- PUMP IN
CN2
CASCADE
When wiring the heaters for Cascade operation, select one
heater as the Leader. The remaining heaters will be designated
as Members. See page 50 Configuration of the Cascade for a
detailed explanation of this procedure.
MODBUS
Wiring of the cascade
Installation & Operation Manual
6
Start-up
Check/control water chemistry
Do not use petroleum-based cleaning or
sealing compounds in the boiler system.
Damage to elastomer seals and gaskets
in the system could occur, resulting in
substantial property damage.
Hardness less than 7 grains
 CAUTION
1. Consult local water treatment companies for hard
water areas (above 7 grains hardness).
Chlorine concentration less than 200 ppm
1. Do not fill boiler or operate with water containing
chlorine in excess of 200 ppm.
2. Filling with chlorinated fresh water should be acceptable
since drinking water chlorine levels are much lower.
3. Do not use the boiler to directly heat swimming pool or
spa water.
Test/replace freeze protection fluid
1. For systems using freeze protection fluids, follow fluid
manufacturer’s instructions.
2. Freeze protection fluid must be replaced periodically
due to degradation of inhibitors over time. Follow all
fluid manufacturer’s instructions.
Freeze protection (when used)
1.
Determine freeze protection fluid quantity using
system water content, following fluid manufacturer’s
instructions. Appliance water content is listed on page
8. Remember to include expansion tank water content.
2.
Local codes may require a backflow preventer or actual
disconnect from city water supply.
3.
When using freeze protection fluid with automatic fill,
install a water meter to monitor water makeup. Freeze
protection fluid may leak before the water begins to
leak, causing concentration to drop, reducing the freeze
protection level.
Fill and test water system
1. Fill system only after ensuring the water meets the
requirements of this manual.
 WARNING Eliminate all system leaks. Continual
fresh makeup water will reduce boiler life.
Minerals can build up in the heat exchanger,
reducing heat transfer, overheating the heat
exchanger, and causing heat exchanger
failure.
Purge air from water system
1. Purge air from system:
a. Connect a hose to the purge valve (see purge/drain
valves, in the piping diagrams on pages 39 - 42). Route
the hose to an area where water can drain and be seen.
b. Close the boiler or system isolation valve between
the purge valve and fill connection to the system.
c. Close zone isolation valves.
d. Open quick-fill valve on cold water makeup line.
e. Open purge valve.
f. One zone at a time, open the isolation valves. Allow
water to run through the zone, pushing out the air.
Run until no noticeable air flow is present. Close the
zone isolation valves and proceed with the next zone.
Follow this procedure until all zones are purged.
g. Close the quick-fill water valve and purge valve and
remove the hose. Open all isolation valves. Watch
that system pressure rises to correct cold-fill
pressure.
h. After the system has operated for a while, eliminate
any residual air by using the manual air vents located
throughout the system.
i. If purge valves are not installed in the system, open
the manual air vents in the system one at a time,
beginning with the lowest floor. Close the vent when
water squirts out. Repeat with remaining vents.
2. Open automatic air vent (diaphragm-type or bladder-type
expansion tank systems only) one turn.
3. Open other vents:
a. Starting on the lowest floor, open air vents one at a
time until water squirts out.
b. Repeat with remaining vents.
4. Refill to correct pressure.
Check for gas leaks
 WARNING
Before starting the boiler, and during initial
operation, smell near the floor and around
the boiler for gas odorant or any unusual
odor. Remove the front access panel and smell
the interior of the boiler enclosure. Do not
proceed with startup if there is any indication
of a gas leak. Use an approved leak detection
solution. Repair any leaks at once.
 WARNING
Propane boilers only – Your propane supplier
mixes an odorant with the propane to make
its presence detectable. In some instances, the
odorant can fade, and the gas may no longer
have an odor. Before startup (and periodically
thereafter), have the propane supplier verify
the correct odorant level in the gas.
2. Close manual and automatic air vents and boiler drain
valve.
3. Fill to correct system pressure. Correct pressure will
vary with each application.
a. The minimum cold water fill pressure should be
12 PSI.
b. Pressure will rise when boiler is turned on and
system water temperature increases.
4. At initial fill and during boiler startup and testing,
check system thoroughly for any leaks. Repair all leaks
before proceeding further.
47
Installation & Operation Manual
6
Start-up
Check thermostat circuit(s)
1. Disconnect the two external wires connected to the enable
terminals on the connection board.
2. Connect a voltmeter across these two incoming wires.
Close each thermostat, zone valve, and relay in the external
circuit one at a time and check the voltmeter reading across
the incoming wires.
3. There should NEVER be a voltage reading.
4. If a voltage does occur under any condition, check and
correct the external wiring. (This is a common problem
when using 3-wire zone valves.)
5. Once the external thermostat circuit wiring is checked and
corrected if necessary, reconnect the external thermostat
circuit wires to the connection board. Allow the boiler to
cycle.
Check vent and air piping
Inspect vent piping and air piping for signs of deterioration
from corrosion, physical damage or sagging. Verify air piping
and vent piping are intact and correctly installed per this
manual.
Placing the boiler in operation
Boiler operational checks
1. Turn the boiler main power switch to the “ON”
position.
2. Verify operation of the SMART SYSTEM control
module and Operator Interface.
3. Program the adjustable points from the Operator
Interface.
4. Push the reset for the low water cutoff (if equipped).
5. Ensure that maximum flow to the boiler does not exceed
55 GPM on Models 402 - 752 and 90 GPM on Models
992 - 2072. Verify by checking temperature rise while
burner is firing at 100% of rated input.
6. Install a manometer on the gas supply to the boiler and
verify minimum gas supply pressure as the burner fires at
100% of rated input.
7. Verify operation of safeties as necessary (low water
cutoff, high limit, gas pressure, etc.,).
8. Verify that all adjustable points in the Operator
Interface are set as required.
9. Once the boiler analysis is complete, test the safety shutoff
device by turning the manual shutoff valve to the OFF
position and ensuring that the boiler shuts down and
registers an alarm. Open the manual shutoff valve and reset
the control.
10. Place the boiler back into normal operation.
Boiler operation
11. Boiler should begin the start-up process for the
sequence of operation.
12. The boiler will ignite at the proper ignition speed and
will stage to meet the system demand.
13. Ensure that inlet water temperature does not fall below
the specified minimum for the boiler.
14. Based on system demand, boilers may run for an
extended period of time at a reduced rate of input to
maximize efficiency.
48
15. As system demand is satisfied, the burner will cycle off
and the combustion air blower will run for a post
purge operation before the boiler shuts down.
Start the boiler
Read and follow the Lighting Instructions in FIG. 6-1, on page
49.
If boiler does not start correctly
1. Check for loose connections, blown fuse or service switch
off?
2. Is external limit control (if used) open? Is boiler water
temperature above 200°F (93.3°C)?
3. Is thermostat set below room temperature?
4. Is gas turned on at meter or boiler?
5. Is incoming gas pressure less than 4.5" water column?
If none of the above corrects the problem, refer to the
Troubleshooting Section of the Copper-fin II Service Manual.
 WARNING The venting system must be installed so that
it will prevent flue gas spillage and carbon
monoxide emissions, which will result in
severe personal injury or death.
Set space heating operation (boiler only)
Determine controlling sensor
For space heating systems, the temperature control can be based
on one of four sensors; the inlet, outlet, system supply sensor,
or system return sensor. The SMART SYSTEM control is
programmed at the factory to control the temperature of the
outlet sensor. The control will automatically switch to the
system supply sensor once it is connected. If it is desired to base
the temperature control on the inlet sensor, the appropriate
parameter must be changed in the control. See the Copper-fin II
Service Manual for a detailed explanation of this procedure. The
control will automatically switch to the system return sensor
once it is connected. It is recommended that a system supply
sensor be installed even when using the inlet sensor as the
controlling sensor.
Verify space heat circulator mode
The Space Heating Mode controls both the system (primary)
pump (if connected), and the boiler (secondary) pump. When
the SMART SYSTEM control receives a space heating call for
heat, it turns on the system pump. If the boiler is not heating
an indirect DHW (Domestic Hot Water) tank, it also turns on
the boiler pump. After the space heating call for heat ends, the
system pump continues to run for a short period of time. If the
boiler pump was running, it continues to run for a short period
of time as well. These pump delays are factory set to 30 seconds.
If different delays are desired, the appropriate parameters in the
control must be changed. See the Copper-fin II Service Manual
for a detailed explanation of this procedure.
Set space heating set point temperature
The UP and DOWN keys may be used during normal operation
to adjust the space heating set point temperature (see FIG. 7-1
on page 56 of this manual). Once the desired temperature is
displayed, press the ENTER/RESET key to save the new setting.
If the ENTER/RESET key is not pressed, the new setting will
be used for the current heating cycle only. The old setting will
become active after the current heating cycle ends.
Installation & Operation Manual
6
Start-up
(continued)
Figure 6-1_Lighting Instructions
FOR YOUR SAFETY READ BEFORE OPERATING
WARNING: If you do not follow these instructions
exactly, a fire or explosion may result causing
property damage, personal injury or loss of life.
A. This appliance is equipped with an ignition
device which automatically lights the burner.
Do not try to light the burner by hand.
B. BEFORE OPERATING smell all around the
appliance area for gas. Be sure to smell next
to the floor because some gas is heavier
than air and will settle on the floor.
FOR YOUR SAFETY
"WHAT TO DO IF YOU SMELL GAS"
Do not try to light any appliance.
Do not touch any electrical switch; do not use
any phone in your building.
Immediately call your gas supplier from a
neighbor's phone. Follow the gas supplier's
instructions.
If you cannot reach your gas supplier,
call the fire department.
C. Use only your hand to turn the gas
control knob. Never use tools. If the
knob will not turn by hand, don't try to
repair it, call a qualified service technician. Force or attempted repair may
result in a fire or explosion.
D. Do not use this appliance if any part
has been under water. Immediately call
a qualified service technician to inspect
the appliance and to replace any part
of the control system and any gas control which has been under water.
OPERATING INSTRUCTIONS
1. STOP! Read the safety information above on
this label.
5. Push in gas control knob slightly and
turn clockwise
to "OFF."
OFF
2. Turn off all electric power to the appliance.
3. Open control access panel.
4. This appliance is equipped with an ignition
device which automatically lights the burner.
Do not try to light the burner by hand.
ON
NOTE: On the 36C valve, knob cannot be
turned to "OFF" unless knob is pushed in
slightly. Do not force.
6. Wait five (5) minutes to clear out any gas.
Then smell for gas, including near the floor. If
you smell gas, STOP! Follow "B" in the safety
information above on this label. If you don't
smell gas, go to the next step".
PSI
7. Turn gas control knob counterclockwise
to "ON."
OFF
IN
ON
OFF
GAS CONTROL KNOB
SHOWN IN THE "ON" POSITION
ON
8. Replace control access panel.
9. Turn on all electric power to the appliance.
10. If the appliance will not operate, follow
the instructions "To Turn Off Gas To
Appliance" and call your service technician or gas supplier.
TO TURN OFF GAS TO APPLIANCE
1. Turn off all electric power to the appliance
if service is to be performed.
3. Push in gas control knob slightly and
turn clockwise
to "OFF". Do not
force.
2. Open control access panel.
4. Replace control access panel.
OFF
ON
LBL2084 REV D
49
Installation & Operation Manual
6
Start-up
Set DHW operation
Verify DHW circulator mode (boiler only)
The DHW Mode is programmed to heat an indirect domestic
hot water tank. When the tank thermostat or tank sensor calls
for heat, the SMART SYSTEM control will turn on the DHW
pump and turn off the boiler pump (if running). If the system
pump is running, it will remain on. When the DHW call for
heat ends, and there is no space heating call for heat, the DHW
pump will continue to run for a period of time. This pump
delay is set at the factory to 30 seconds. If a shorter or longer
delay is desired, the appropriate parameter in the control must
be changed. See the Copper-fin II Service Manual for a detailed
explanation of this procedure. If there is an active space heating
call for heat, then the boiler pump will be turned on and the
DHW pump will be turned off.
Set outlet target temperature (boiler only)
When in the DHW Mode, the control will modulate to maintain
the outlet temperature to a set point. This set point is set at the
factory to 180°F (82.2°C). If a different set point is desired, the
appropriate parameter in the control must be changed. See the
Copper-fin II Service Manual for a detailed explanation of this
procedure.
Set tank target temperature
If a tank sensor is used, the tank set point can be adjusted by
pressing either the UP or DOWN key. A menu will appear on
the LCD display. Press the DOWN key to select the tank set
point, and press ENTER. Use the UP and DOWN keys to adjust
the set point. Press the ENTER key again to save the new set
point and return to the normal display.
Set clock
The SMART SYSTEM control has a built-in clock that it uses
for its night setback feature and for logging events. This clock
must be set when the appliance is installed, and anytime the
appliance has been powered off for more than one month. Use
the following procedure to set the clock:
1.
2.
3.
4.
5.
6.
7.
8.
Press and hold the MENU key (FIG. 7-1) for at least 5
seconds.
The display changes to ready “ENTER MENU CODE”,
with four (4) zeros below it.
Change the zeros to match the user code (factory set at
“0704”). Use the UP and DOWN keys to increment or
decrement the flashing digit, and the NEXT and
PREVIOUS keys to select which digit flashes.
Press the ENTER key.
The display changes to read USER CODE for a few
seconds, then displays a menu.
Press the ENTER key.
Press the UP key twice to display “A3 DATE AND
TIME”.
Press the ENTER key once.
50
9.
The date and time are displayed as “YY:MM:DD W
hh:mm”, where:
mm: minutes
hh:
hour (24 hour time; e.g., 2:00 PM = 14:00)
W:
day of the week (1 = Sunday, 2 = Monday,
3 = Tuesday, etc.,)
YY: year
MM: month
DD: date
NOTICE
The internal clock does not adjust for
Daylight Savings Time and therefore, will
require a manual adjustment.
Use the UP and DOWN keys to increment or decrement the
flashing number, and the NEXT and PREVIOUS keys to select
which number flashes.
10. Press the ENTER key to save the setting.
11. Press the MENU key twice to exit the Programming
Mode.
Configuration of the cascade
When installed in a Cascade system, the individual controls must
be programmed for cascade operation. This is accomplished by
accessing the control parameters.
Input the Installer code as described in the Copper-fin II Service
Manual. Once the control parameters have been accessed, use
the DOWN arrow key to select the H Control Mode parameters.
Press the ENTER key to access these parameters. Use the UP
arrow key to access parameter H4 Cascade. Press the ENTER
key to access this parameter. Use the DOWN arrow key to select
Enable. Press the ENTER key to program this into the control.
Press the EXIT key, then press the DOWN key until I Cascade
is selected.
Press the ENTER key to select the parameter I1 BLR Address.
Press the ENTER key to access this parameter. Each unit in the
Cascade system must be programmed with its own address.
The unit designated as the Leader will have an address of 0.
The remaining units in the Cascade will be Members and have
addresses from 1 - 7. Use the UP and DOWN arrow keys to
select the appropriate address. Press the ENTER key to program
this into the control.
Press the MENU key twice to exit the control parameters. Repeat
this procedure for all appliances in the Cascade, designating the
Leader control and the Member controls.
Installation & Operation Manual
7
Operating information
(continued)
General
0 - 10V input (set point or power)
How the appliance operates
The Copper-fin II uses a copper finned tube heat exchanger to
transfer heat from the flue products to the water. An electronic
control module monitors various inputs to initiate a call for
heat. The blower provides both primary and secondary air to
the burner and forces the flue products out of the combustion
chamber and into the vent system. The control module
regulates the blower speed and firing stages, based upon the
heat demand. Gas valves regulate the amount of gas supplied
for the firing stages, which is then mixed with the combustion
air supplied to the burner.
NOTICE
NOTICE
If an inline high gas pressure regulator is
used, it MUST BE of the lockup type and
be located a minimum of 10 feet from
the appliance. Failure to do so may result
in insufficient gas volume supplied to the
appliance.
If a pressure drop of more than 2" water
column occurs between Standby (static)
Mode and Operating (dynamic) Mode, a
gas volume problem exists. Contact the gas
utility, gas supplier, qualified installer, or
service agency to determine the necessary
steps to provide the proper gas volume to
the appliance.
How the control module operates
The SMART SYSTEM control module receives input from
appliance sensors and external devices. The control module
activates and controls the blower and gas valves to regulate heat
input and switches the boiler, Domestic Hot Water (DHW),
and system pumps on and off as needed. The user programs the
module to meet system needs by adjusting control parameters.
These parameters set operating temperatures and appliance
operating modes. Boiler operation can be based on boiler
outlet water temperature, boiler inlet water temperature, system
supply temperature, or system return temperature, depending
on the parameter setting. Water heater operation can be based
on a tank sensor or a tank thermostat.
Control inputs and outputs
Staging S1 - S4
The S1 input tells the boiler to provide water for space heating.
The S2 - S4 inputs are used when a sequencer controls the
boiler.
Tank Aquastat
This input tells the boiler to provide water for heating a
domestic hot water tank.
The Copper-fin II can be controlled by a Building Management
System (BMS) using a 0 - 10 VDC signal. The control can be
configured by the installer to use this signal to either control set
point or firing rate.
DHW priority (boiler only)
The SMART SYSTEM control module allows connection of a
DHW thermostat or tank sensor to the low voltage connection
board. When the DHW thermostat or tank sensor calls for heat,
the module activates the DHW pump, shuts down the boiler
pump, and immediately sets the target outlet water temperature
to 180°F (82.2°C). This provides automatic priority heat
allocation to the indirect water heater for maximum response
and recovery. The DHW pump continues for 30 seconds after
the heating cycle to deliver the most possible heat.
DHW / SH (space heating) cycling (boiler only)
If an indirect DHW call for heat is received while a space heating
call is in progress, the control will start the DHW pump and
shut the boiler pump off. The system pump will remain on.
If the space heating call is still active while the DHW call is in
operation, the control will wait for 30 minutes (time adjustable
by installer) then it will switch back to the space heating
demand. The control will switch back and forth until one of the
heat demands end.
Programmable controlling sensor (boiler only)
The control module is programmed to use the outlet sensor
as the control sensor by default. If a system supply sensor
is connected, the control automatically uses it as the control
sensor. The control sensor can be changed by the installer to the
inlet sensor. In this case, if a system return sensor is installed, the
control automatically uses it as the control sensor. If the inlet
sensor is chosen as the controlling sensor, it is recommended
that the system supply sensor be installed for the best system
performance.
Anti-cycling (boiler only)
After the set point has been satisfied, the control will delay the
next burner cycle for a set time period (time is adjustable by the
installer). The time delay will be bypassed if the system return
temperature drops too far during the delay.
Boiler, system, and DHW pump control
When a space heating call for heat starts and no DHW call is on,
the system and boiler pumps are turned on. As long as the space
heating call for heat is on, the system pump will remain on. If
a DHW call for heat is on, the boiler pump will wait to turn
on until just before the DHW pump turns off. After the space
heating call for heat ends, both pumps will run for an additional
period of time.
When a DHW call for heat starts, the DHW pump is turned on.
If a space heating call for heat was on, the boiler pump will turn
off a few seconds after the DHW pump turns on.
51
Installation & Operation Manual
7
Operating information
Temperature control
Protection features
Firing rate
Outlet temperature, and temperature rise limiting
Depending upon the model, the Copper-fin II is capable
of staging its firing rate from a minimum of 25% to a
maximum of 100%. The firing rate is dictated by the call
for heat (i.e., space heating or domestic hot water), the
heating load, ramp delay (if enabled), and various other
temperature limitations.
The outlet temperature is monitored by the boiler outlet
temperature sensor. When the outlet temperature exceeds
230°F (110°C) (boilers) or 190°F (88°C) (water heaters), the
unit will reduce the firing rate. If the outlet water temperature
exceeds 235°F (113°C) (boilers) or 200° (93°C) (water heaters)
the control will shut the unit down until it cools off.
Ramp delay (boiler only)
For systems with lower flow, the SMART SYSTEM can
limit the firing rate (when enabled) when a space heating
call for heat starts, or when switching from a DHW call for
heat to a space heating call for heat. There are six (6) limits
that can be programmed, as well as six (6) time intervals
corresponding to each limit. The sixth limit will also limit
the firing rate for the rest of the call for heat.
Gradient limiting
If during operation of the heater the outlet water temperature
is rising too quickly, the control will reduce the firing rate
to its lowest setting.
Outdoor air reset (boiler only)
With the outdoor air sensor connected, the control module
will calculate the set point based on the programmed reset
curve. The installer can change the slope of the reset curve
by several adjustable parameters. The user can limit the
maximum set point for the system using the space heating
set point.
Boost function (boiler only)
If outdoor air reset is active, and a space heating demand
has been active continuously for a set period of time
(time adjustable by installer) and there has been no DHW
demands, the control may be programmed to increase
the set point by a fixed number of degrees (adjustable by
installer). This process will repeat until the space heating
demand ends, the set point reaches the programmed set
point or a maximum of 20 increases has occurred. Once
the system heat demand is satisfied, the set point will revert
to the value determined by the reset curve.
Night setback
The controller may be programmed to reduce the space
heating (boilers) and tank set points during a certain time
each day. A start and stop time can be programmed for
each day of the week.
52
The control monitors the temperature difference between
the inlet and the outlet sensor. If this difference exceeds the
first limit the control will turn off stages. If the temperature
difference exceeds a second limit the control will shut the unit
down. The unit will restart automatically once the temperature
difference has dropped 10°F (6°C) and the minimum off time
has expired.
Freeze protection
DO NOT install the appliance in a room likely to freeze.
The following integral feature of the SMART SYSTEM control
module provides some protection for the appliance only -- not
for the system.
•
•
•
•
The SMART SYSTEM control module provides
freeze-up protection as follows when the appliance
water temperature drops below 45°F (7.2°C):
Below 45°F (7.2°C), the appliance and system pumps
operate constantly.
Below 37°F (2.7°C), the appliance turns on.
Appliance and pumps turn off if appliance water
temperature rises above 45°F (7.2°C).
 CAUTION
This feature of the SMART SYSTEM
control module does not eliminate the
possibility of freezing. The installer must
still use recognized design, installation and
maintenance practice to prevent freeze
potential for the appliance and system.
High limit operations
When outlet temperature exceeds 240°F (116°C) (boilers) or
210°F (99°C) (water heaters), high limit action occurs. The
appliance shuts down until the outlet water cools down and the
RESET button on the Operator Interface is pressed.
Installation & Operation Manual
7
Operating information
(continued)
Low water cutoff protection
Boiler temperature regulation
1.
Operating temperature (target)
2.
The SMART SYSTEM control module uses temperature
sensing of both inlet and outlet areas of the heat exchanger.
If the flow rate is too low or the outlet temperature too
high, the control module modulates and shuts the appliance
down. This along with the flow switch, ensures appliance
shutdown in the event of low water or low flow conditions.
Some codes and jurisdiction may accept these integral
features of the control in lieu of requiring an additional
limit control or low water cutoff. Consult local jurisdiction
to determine. Contact manufacturer for low water cutoff
kit availability.
Monitor external limits
Connections are provided on the connection board for external
limits such as a louver proving switch. The SMART SYSTEM
will shut off the burner and inhibit relighting whenever any of
these external limits open.
The SMART SYSTEM control module senses water temperature
and regulates appliance firing and firing rate to achieve a target
temperature. The target temperature can be set between 70°F
(21°C) and 220°F (104°C) (boilers) or between 60°F (16°C) and
190°F (88°C) (water heaters).
•
Target temperature is fixed when the outdoor
sensor is not installed (boilers).
•
Target temperature is calculated as described
under “Outdoor Air Reset Operation” and
“Boost Function” when the outdoor sensor is
connected (boilers).
Outdoor reset operation, if used (boilers
only)
Target temperature with outdoor reset
Run-time and alarm outputs
The appliance provides dry contacts for indicating when the
appliance is running, and when it is unable to operate.
Run-time and cycle counting
The control uses two timers to monitor the total hours of
burner operation. One timer monitors the time the appliance
is firing under 50% of rate. The other timer monitors the time
the appliance is firing over 50% rate.
The control uses four (4) ignition counters to monitor the
amount of appliance cycles. The first counter counts all
ignitions of the control. The second counter counts only
ignition attempts that have failed. The third and fourth
counters are the same as the first and second respectively, but
can be reset by the installer.
Service reminder
The control can be programmed for service reminder
notification. This notification will become active when either a
set time frame has expired, or a set amount of running hours or
cycles has expired (all adjustable by the installer). The display
will alternate the standard text on the display screen with Service
Due every 5 seconds. The service reminder notification can be
reset by the installer.
Error logging
The control will hold in memory the last 10 error codes as
well as the last 10 turn-off functions. The date and time of the
occurrence will be recorded as well. Only the 10 most current
occurrences will be held in memory.
This feature improves the system’s efficiency as the outdoor
temperature warms up.
See the Copper-fin II Service Manual to change the settings.
Reset curve
The reset curve looks at outdoor air temperature and adjusts the
set point.
Cascade
When multiple appliances are installed, they can be wired
together in a cascade sequence. A maximum of eight appliances
can be controlled from a single control. In this application one
appliance would be designated as the Leader control and all
others would be designated as Member controls. The set point
or firing rate can be controlled by the 0 - 10V input as well.
Once the Leader appliance receives a call for heat from a BMS,
tank sensor, or external thermostat, the control will determine
what the set point will be. A fixed temperature set point can be
programmed into the control. See Copper-fin II Service Manual
to program the set point.
On boilers, if the water temperature at the system sensor is less
than the set point + the turn-off offset - the off-on differential,
then the control will initiate a call for heat on the Cascade (see
the Copper-fin II Service Manual for an explanation of the offset
and differential). The Leader will energize the lead appliance on
the Cascade. For a new startup this will be the Leader appliance.
On water heaters, if the water temperature at the tank sensor is
less than the tank set point - the off differential, then the control
will initiate a call for heat on the Cascade.
53
Installation & Operation Manual
7
Operating information
The appliance will fire at its ignition speed and will then
stage its firing rate to maintain the set point. If the first
appliance reaches 100% of its firing rate, the Leader will
calculate at what point the second appliance could fire at its
minimum firing rate. At this point, the Leader will fire the
second appliance on the Cascade. For a new startup, this
would be the first Member appliance. The appliance will
fire at its ignition speed and will then staging its firing rate
to maintain the set point.
If the set point still cannot be met, the Leader will continue
firing more Members until either the heat demand is met or
all appliances on the Cascade are firing. As the heat demand
decreases, the last appliance on will stage down to its
minimum firing rate. Once the demand for that appliance
is 0% it will shut down. As the heat demand decreases
further, the second to last appliance will stage down and
shut off. This will continue until the demand is satisfied
and all appliances are shut off.
Sequence of the cascade
DHW, Night Setback, and Ramp Delay operation with
cascade
For indirect DHW operation any boiler(s) in the Cascade can
be selected to provide heat for a DHW call. Select a boiler to be
designated as the DHW boiler. Connect the tank thermostat or
tank sensor to the corresponding terminals on the low voltage
connection board. When the boiler receives a DHW call, the
Leader control will take that boiler out of the Cascade sequence.
If another boiler is available, the Leader will start it up to take
its place.
The DHW boiler will adjust its set point to the programmed
outlet set point and will adjust its firing rate to maintain this.
Once the DHW call has been satisfied, the Leader control will
place that boiler back into the Cascade sequence.
Switching of the boiler between DHW operation and SH
operation when there is a call for both does not occur. The
boiler will provide heat for the DHW demand until it is satisfied.
To equalize the run time of all appliances on the Cascade,
the firing sequence will automatically be changed at set
intervals.
Night Setback operation of the boilers or water heaters within
the Cascade is available. Programming of the Space Heating
(SH) Night Setback will be done through the Leader boiler.
Refer to the Copper-fin II Service Manual for information
regarding Night Setback.
For the first 24 hours after initializing the Cascade, the
sequence will be changed every hour. After that the sequence
will be changed once every 24 hours. The switching on/off
sequence will be as follows:
Ramp Delay operation of the boilers as described in the
Copper-fin II Service Manual is available when the boilers are
part of a Cascade system.
DAY
SWITCHING ON SEQUENCE
Start
L-M1-M2-M3-M4-M5-M6-M7
+ 1 hour
M1-M2-M3-M4-M5-M6-M7-L
+ 2 hour
M2-M3-M4-M5-M6-M7-L-M1
54
Installation & Operation Manual
7
Operating information
(continued)
Sequence of operation
OPERATION
DISPLAY
1. The manual reset high limit must be closed before any action will HTR: Standby
OUT: 123.8F(129)
take place.
2. Upon a call for heat the control turns on the appropriate pumps
HTR: Standby
(system and boiler pumps for space heating; DHW pump for DHW
OUT: 123.8F(129)
call). The flow switch and low water cutoff (if equipped) must
close.
3. • If the unit is equipped with a proof of closure valve, the
proof of closure switch must be closed. The proof of closure
valve is then energized. The gas pressure switch(es) (if equipped)
must close.
HTR: Standby
• If the contact for the louvers is closed, the louver proving,
OUT: 123.8F(129)
and auto reset high limit (water heater only) inputs must close.
• If the air pressure switch is open, the prepurge cycle then
begins by starting the combustion blower. Once started,
the air pressure switch must close.
4. After prepurge, the blower slows down and the hot surface ignitor HTR: PREPURGE
OUT: 123.9F(129)
(HSI) is energized.
5. Once the HSI is hot, the trial for ignition begins with the HTR: IGNITION
OUT: 123.9F(129)
opening of the gas valve.
6. If the SMART SYSTEM control does not sense flame, then it will
lock out.
HTR: POSTPURGE, LOCKOUT
OUT: 123.9F(129)
7. If the SMART SYSTEM control senses flame, it will fire the burner
to maintain the set point. The firing rate will stage as required to
HTR: RUN STG: 1
hold the actual temperature at the set point. If the boiler lights due
OUT: 124.8F(129)
to a space heating call for heat, and the ramp delay function is
active (default is disabled), the staging will be held to a series of
increasing limits after the burner has lit.
8. If the space heating call for heat is active, and a DHW call for heat
becomes active, the control will turn on the DHW pump and then
turn off the boiler pump (boiler and DHW pump operation briefly HTR: DHW STG 123
overlap to ensure that flow is maintained throughout the unit). This OUT: 177.8(180)
will divert the hot water away from the heating zone(s) and send it
to the DHW tank instead. The control will then modulate to maintain
the outlet temperature to the DHW boiler set point.
9. If the DHW call for heat remains active for more than 30 minutes,
and the space heating call for heat is also on, then the control
will turn on the boiler pump, turn off the DHW pump and resume
firing based on the space heating set point (boiler and DHW HTR: RUN STG 12
pump operation briefly overlap to ensure that flow is maintained OUT: 123.0F(129)
throughout the unit). As long as both the space heating and DHW
calls for heat remain active, the control will switch back and forth
between the two modes until one of them is satisfied.
10. Once both calls for heat are satisfied, the control will turn
off the burner. The blower will remain on for the postpurge cycle. HTR: POSTPURGE
Any pumps that are running will continue to run for their respective OUT: 127.4F(129)
pump delay times, then turn off.
11. Boiler pump off, system pump continues its delay if longer.
HTR: Standby
OUT: 124.7F(129)
12. System pump off.
HTR: Standby
OUT: 122.9F(129)
55
Installation & Operation Manual
7
Operating information
Copper-fin II control module
Use the control panel (FIG. 7-1) to set temperatures, operating conditions, and monitor appliance operation.
Figure 7-1_Control Panel - Operator Interface
• Hold 5 seconds to enter code
Input Mode (Menu Mode)
• Press to move up one level
in Menu Mode or to exit
Menu Mode
DISPLAY SCREEN
MENU/EXIT
UP
DOW N
• Press to change boiler water
temperature and/or tank water
temperature set point during
normal operation
• Press to change displayed data
values in Menu Mode
• Press to navigate through menu
listing in Menu Mode
56
• 2-Line / 16 character LCD display
• Backlit LCD
• Press to turn heater off or back on
• Press to select a menu item
• Press after parameter programming
to store parameter data
• Press to exit Service Mode
ENTER/RESET
PREVIOUS
NEXT
• Press to toggle display during normal
operation to show outlet and return
temperatures, fan speed, flame signal, etc.
• Press to toggle between digits when
entering access code or between hour,
minutes, etc., when entering date and time
• Press and hold both to enter Service Mode
Installation & Operation Manual
7
Operating information
(continued)
Access modes
User
The user can adjust the space heating target temperature and the tank target temperature (if
a tank sensor is used) by using the UP and DOWN buttons (FIG. 7-1) at any time during
normal operation. By entering the USER code (0704), the user can also change temperature
units, time and date, and night setback settings. In User Mode, the following parameters can
be viewed but not changed:
•
•
•
•
•
Boiler outlet water target temperature in DHW Mode
Appliance model number
Software version
Total operating hours
Total cycles
Installer
Most parameters are available only to the installer, accessible only by entering the installer
access code, see the Copper-fin II Service Manual.
Saving parameters (reference the Parameter Table in the Copper-fin II Service
Manual)
To save parameters and exit programming:
Press the ENTER/RESET button, then the MENU/EXIT button 3 times.
To keep parameter settings only for a current operating cycle:
Press the MENU/EXIT button 3 times after making all desired parameter changes.
To enter a parameter and continue programming:
Press the MENU/EXIT button 1 time to return to the parameter listings; press again to
return to the menu listings. Remember to press the ENTER/RESET button when finished
programming in order to save the changes made.
See the Copper-fin II Service Manual for a detailed description of parameters and access
modes.
57
Installation & Operation Manual
7
Operating information
Status display screens
Status Display Screens
By using the Previous/Next (, ) arrow keys on the SMART SYSTEM display panel, you can navigate through the 11 display
screens. Each screen will contain two (2) viewable items. The following is a description of the individual items and what they
can display:
Screen #
Screen #1
Line 1
Screen #1
Line 2
Display Shows
Description
HTR: OFF
The unit has been turned OFF by the Enter/Reset button on the
SMART SYSTEM display panel.
HTR: STAND-BY
The unit has not received a call for heat from a remote thermostat nor
has it received a call for heat from a DHW thermostat.
HTR: SETPOINT MET
The unit has met the water temperature set point, but is still receiving
a call for heat from either a remote thermostat, a DHW thermostat,
or a BMS.
HTR: PRE-PURGE
The unit has initiated the pre-purge upon a call for heat.
HTR: IGNITER * ON
The unit has begun the heatup time prior to the trial for ignition.
Display will show IGNITOR A or IGNITOR B depending on which
stage has priority.
HTR: RUN STG ****
Or
HTR: DHW STG ****
The unit has fired and is running at the displayed number of stages
(1,2,3,4)
HTR: POST-PURGE
The call for heat has been satisfied and the unit runs the fan for an
additional post-purge period to clear the combustion chamber and
vent system of residual flue products.
HTR: SERVICE MODE
The unit has been placed in a temporary mode that will allow the unit
to fire for the purpose of combustion analysis.
OUT: ***F (***)
When the outlet sensor has been selected as the control sensor
(default), the control will display the outlet temperature as well as the
set point in parenthesis.
OUT: ***F
If the outlet sensor has not been selected as the control sensor or a
system supply sensor is connected, only the outlet temperature will be
displayed.
OUT: OPEN
The control does not detect the outlet sensor.
OUT: SHORTED
The outlet sensor wires or the sensor itself has become shorted.
Press the Next  arrow key on the SMART SYSTEM display to access Screen #2.
58
Installation & Operation Manual
7
Operating information
(continued)
Status Display Screens (cont’d)
By using the Previous/Next (, ) arrow keys on the SMART SYSTEM display panel, you can navigate through the 11 display
screens. Each screen will contain two (2) viewable items. The following is a description of the individual items and what they
can display:
Screen #
Screen #2
Line 1
Screen #2
Line 2
Display shows:
Description
INLET: ***F (***)
When the inlet sensor has been selected as the control sensor, the
control will display the inlet temperature as well as the set point in
parenthesis.
INLET: ***F
If the inlet sensor has not been selected as the control sensor or a system
return sensor is connected, only the inlet temperature will be displayed.
INLET: OPEN
The control does not detect the inlet sensor.
INLET: SHORTED
The inlet sensor wires or the sensor itself has become shorted.
RISE: ***F
The difference between the inlet temperature and the outlet temperature
is displayed.
Press the Next  arrow key on the SMART SYSTEM display to access Screen #3.
Screen #3
Line 1
Screen #3
Line 2
SYSSUP: ***F (***)
When the system supply sensor has been selected as the control sensor,
the control will display the system supply temperature as well as the set
point in parenthesis.
SYSSUP: ***F
If the system supply sensor has not been selected as the control sensor,
only the system supply temperature will be displayed.
SYSSUP: OPEN
The control does not detect the system supply sensor.
SYSSUP: SHORTED
The system supply sensor wires or the sensor itself has become shorted.
SYSRTN: ***F (***)
When the system return sensor has been selected as the control sensor,
the control will display the system return temperature as well as the
set point in parenthesis.
SYSRTN: ***F
If the system return sensor has not been selected as the control sensor,
only the system return temperature will be displayed.
SYSRTN: OPEN
The control does not detect the system return sensor.
SYSRTN: SHORTED
The system return sensor wires or the sensor itself has become
shorted.
Press the Next  arrow key on the SMART SYSTEM display to access Screen #4.
Screen #4
Line 1
Screen #4
Line 2
OUTDOOR: ***F
The control will display the outdoor air temperature as sensed by the
outdoor air sensor.
OUTDOOR: OPEN
The control does not detect the outdoor air sensor.
OUTDOOR: SHORTED
The outdoor air sensor wires or the sensor itself has become shorted.
TANK: ***F
The control will display the tank temperature as sensed by the tank
sensor.
TANK: OPEN
The control does not detect the tank sensor.
TANK: SHORTED
The tank sensor wires or the sensor itself has become shorted.
59
Installation & Operation Manual
7
Operating information
Status Display Screens (cont’d)
By using the Previous/Next (, ) arrow keys on the SMART SYSTEM display panel, you can navigate through the 11 display
screens. Each screen will contain two (2) viewable items. The following is a description of the individual items and what they
can display:
Screen
Display shows:
Description
Press the Next  arrow key on the SMART SYSTEM display to access Screen #5.
Screen #5
Line 1
0 – 10V BMS: **.*V
The control displays the BMS voltage input from 0 to 10 volts.
Screen #5
Line 2
STG DEMAND: ****
The control displays the number of stages being called by the control.
Press the Next  arrow key on the SMART SYSTEM display to access Screen #6.
Screen #6
Line 1
FAN SPEED: ***
The control will display either OFF, LOW, or HIGH depending upon
fan speed requirements of number of stages firing.
Screen #6
Line 2
0 – 10V RATE: **.*V
The control will display 0 to 10 volts based upon the number of stages
firing.
Press the Next  arrow key on the SMART SYSTEM display to access Screen #7.
Screen #7
Line 1
SH CFH: ***
The control will display either ON or OFF based upon a demand (call
for heat) for space heating.
Screen #7
Line 2
WHR CFH: ***
The control will display either ON or OFF based upon a demand (call
for heat) for DHW (domestic hot water).
Press the Next  arrow key on the SMART SYSTEM display to access Screen #8.
Screen #8
Line 1
SYS PUMP: ***
The control will display either ON or OFF based upon system pump
requirements upon demand for space heating.
Screen #8
Line 2
SYSPUMPSPD: **.*V
The control will display the 0 – 10V input voltage from the system
pump based upon system pump speed.
Press the Next  arrow key on the SMART SYSTEM display to access Screen #9.
Screen #9
Line 1
Screen #9
Line 2
60
UNIT PUMP: ***
The control will display either ON or OFF based upon unit pump
requirements upon demand for space heating.
UNIT PUMP: DELAY
The control will display delay in unit pump operation after the space
heating requirements have been satisfied.
DHW PUMP: ***
The control will display either ON or OFF based upon unit pump
requirements upon demand for DHW.
DHW PUMP: DELAY
The control will display delay in unit pump operation after the DHW
requirements have been satisfied.
Installation & Operation Manual
7
Operating information
(continued)
Status Display Screens (cont’d)
Operation of the cascade
The boiler designated as the Leader will have two additional display screens that can be viewed. These screens will provide
information regarding the operation of the Cascade. Each screen will contain two viewable items. The following is a description
of the individual items and what they can display:
Screen
Display shows:
Description
Press the Next  arrow key on the SMART SYSTEM display to access Screen #10.
Screen #10
Line 1
FLM SIG – A: **.* µA
The control displays the igniter flame signal of igniter A in microamps.
Screen #10
Line 2
FLM SIG – B: **.* µA
The control displays the igniter flame signal of igniter B in microamps.
Press the Next  arrow key on the SMART SYSTEM display to access Screen #11.
Screen #11
Line 1
IGN * AMPS: *.* A
The control displays the current of either igniter A or B.
Screen #11
Line 2
MIX VAL POS: ** %
The control displays the mixing valve percentage open to the system.
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Installation & Operation Manual
8
Domestic water heaters
This section applies only to those appliances used to supply
domestic hot water, installed with a storage tank(s). A circulating
pump MUST be installed in the piping assembly to the storage
tank and valves used to control water velocity through the
appliance. Proper water velocity is important for correct
operation of your water heater.
This section contains specific instructions for those appliances
used to supply domestic hot water. All warnings, cautions,
notes and instructions in the general installation and operation
sections apply to these instructions. Water heaters are designed
for installation with a storage tank. The operation of the
circulating pump, proper sizing of the piping between the tank
and heater and the control of water velocity, as explained in
this section, are important for correct operation of your water
heater.
NOTICE
To ensure proper velocity through the heat
exchanger, it is necessary to regulate the
temperature rise across the heat exchanger
from inlet to outlet. This must be done
on initial installation and periodically
rechecked. With the correct temperature
rise across the heat exchanger when the
water heater is firing at 100% of rated
input, you may be assured of the proper
velocity in the tubes. This will yield long life
and economical operation from your water
heater.
Excessive lime/scale build-up in the heat
exchanger tubes is a result of restricted flow
and too little velocity in the tubes. Excessive
pitting or erosion in the tube is caused by
high water flow and too much velocity
through the tubes. Care should be taken
to measure temperature rise and maintain
velocity as follows:
Initial set-up of maximum water flow
On initial start-up of the Copper-fin II the maximum water flow
through the heat exchanger must be manually set before normal
operation begins.
TABLE - 8A
MAXIMUM WATER FLOW
 CAUTION: The maximum flow rate through a Copper-fin II
water heater with a copper heat exchanger must be set to provide
and not exceed the following flow:
Model
Maximum Flow
402, 502, 652, and 752
55 GPM
992, 1262, 1442, 1802, and 2072
90 GPM
62
If higher flow rates are required through the water heater, an
optional Cupro Nickel heat exchanger is available. Consult the
factory for specific application requirements.
The heat exchanger is capable of operating within the design
flow rates required for the water heater, storage tank(s), and
connecting piping. Erosion of the finned copper tubes may
occur if the flow rate exceeds the maximum allowable flow rate
through the water heater. The maximum flow rate through the
water heater must be adjusted. Maximum flow on Models 402
- 752 is 55 GPM and 90 GPM on Models 992 - 2072. Flow rate
can be determined by measuring the temperature rise through
the water heater when it is firing at full rate input.
TABLE - 8B
TEMPERATURE RISE AT FULL RATE FIRE
55 AND 90 GPM FLOW
Model
402
502
652
752
992
Temperature Rise °F
12
15
20
23
19
1262
24
1442
27
1802
34
2072
39
1. The pump must run continuously when the burner is
firing.
2. With the pump running and the burner in the water heater
in the off cycle, the inlet water temperature and outlet water
temperature readings on the Operator Interface should read
approximately the same temperatures. Water Temperature
Rise on the Operator Interface should read near zero.
3. Turn the water heater on and allow time for the temperature
to stabilize. The Service Mode can be used to force the water
heater to run at full fire. See the Copper-fin II Service Manual
for a detailed explanation of the Service Mode. Check the
water temperature rise in the Operator Interface when the
burner is firing at 100% of rated input.
4. Compare the water temperature rise in the Operator
Interface with the required temperature rise. Should
adjustment be needed, proceed as follows.
Installation & Operation Manual
8
Domestic water heaters
If the temperature rise is too high, the water velocity is
too low, adjust as follows:
(continued)
Water chemistry
NOTICE
1. Check for restrictions in the outlet of the water heater.
2. Be sure all valves are open between the water heater and
the storage tank. Ensure that all ball valves are fully
ported.
3. Check the pump to be sure it is running properly and
that the pump motor is running in the proper
direction.
4. Check diameter and length of the piping between the
storage tank and water heater against the head capacity
of the circulating pump.
5. Be sure the pipes between the water heater and storage
tank are not less than 2 or 2 1/2 inch (63.5mm) diameter
(depending on model). To increase flow and decrease
temperature rise, increase the piping to 3 inch (76.2mm)
diameter (depending on model) to decrease head loss
in the piping to the storage tank.
6. Common manifold piping for multiple unit
installations will require larger minimum pipe sizes
and tank circulating tappings to ensure proper flow.
Water temperature rise and maximum flow
data is based on heating potable water with
a hardness of 5 to 25 grains per gallon and
total dissolved solids not exceeding 350
ppm.
The required temperature rise and the standard circulating
pump are sized based on the heating of potable water with
a hardness of 5 to 25 grains per gallon and a total dissolved
solids not exceeding 350 ppm. Consult the manufacturer when
heating potable water exceeding these specifications. Heating
of high hardness and/or high total dissolved solids water may
require a larger circulating pump, an optional Cupro Nickel
heat exchanger and a revised temperature rise specification
based on the water chemistry of the water to be heated. Water
with a hardness of less than 5 grains per gallon will usually
have a pH which can be aggressive and corrosive causing nonwarrantable damage to the heater, pump, and associated piping.
Corrosion due to water chemistry generally shows up first in
the hot water system because heated water increases the rate of
corrosive chemical reactions.
If the temperature rise is too low, the water velocity is too
high, adjust as follows:
1. Temperature rise can be increased by slowly closing the
field-installed ball valve in the outlet piping from the
water heater to the storage tank to achieve the proper
temperature rise.
2. Sustained high water velocity and low temperature rise
may result in pitting or erosion of the copper tubes in
the heat exchanger. This is a non-warrantable failure.
Temperature rise must be properly adjusted to achieve
the specified flow rate.
3. Once temperature rise has been properly set, return to
normal operation.
 CAUTION
Temperature rise cannot be adjusted
when the burner is firing at less than
100% of rated input.
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Installation & Operation Manual
8
Domestic water heaters
Figure 8-1_Typical Water Heater Piping with Storage Tank
COMMON MANIFOLD SIZE (Min.)
Models: 992, 1262, 1442, 1802 & 2072
Diameter
Number of Units
GPM
(in.)
1
90
2 1/2
COMMON MANIFOLD SIZE (Min.)
Models: 402, 502, 652, & 752
Diameter
Number of Units
GPM
(in.)
1
55
2
COLD
WATER
SUPPLY
MIXING
VALVE
BUILDING
HOT WATER
SUPPLY
RELIEF
VALVE
INLET
RELIEF
VALVE
OUTLET
BUILDING
RETURN
LOCK-TEMP
STORAGE
TANK
NOTICE
64
DRAIN
Please note that these illustrations are meant to show system piping concept only, the installer is responsible
for all equipment and detailing required by local codes.
Installation & Operation Manual
8
Domestic water heaters
(continued)
Figure 8-2_Single Water Heater Piping with Two Storage Tanks
COMMON MANIFOLD SIZE (Min.)
Models: 402, 502, 652, & 752
Diameter
Number of Units
GPM
(in.)
1
55
2
BUILDING
HOT WATER
SUPPLY
COMMON MANIFOLD SIZE (Min.)
Models: 992, 1262, 1442, 1802 & 2072
Diameter
Number of Units
GPM
(in.)
1
90
2 1/2
MIXING
VALVE
COLD
WATER
SUPPLY
INLET
RELIEF
VALVE
OUTLET
LOCK-TEMP
STORAGE
TANK
DRAIN
BUILDING
RETURN
NOTICE
Please note that these illustrations are meant to show system piping concept only, the installer is responsible
for all equipment and detailing required by local codes.
65
Installation & Operation Manual
8
Domestic water heaters
Figure 8-3_Multiple Water Heater Piping with a Single Storage Tank
COMMON MANIFOLD SIZE (Min.)
Models: 992, 1262, 1442, 1802 & 2072
Diameter
Number of Units
GPM
(in.)
2
180
4
COMMON MANIFOLD SIZE (Min.)
Models: 402, 502, 652, & 752
Diameter
Number of Units
GPM
(in.)
2
110
3
3
165
3 1/2
3
270
5
4
220
4
4
360
6
5
275
5
5
450
6
6
330
5
6
540
6
7
385
6
7
630
7
8
440
6
8
720
7
MIXING
VALVE
COLD
WATER
SUPPLY
BUILDING
HOT
WATER
SUPPLY
RELIEF
VALVE
LOCK-TEMP
STORAGE
TANK
DRAIN
MIN 4"
COMMON
MANIFOLD
SIZE
BUILDING
RETURN
NOTICE
66
Please note that these illustrations are meant to show system piping concept only, the installer is responsible
for all equipment and detailing required by local codes.
Installation & Operation Manual
8
Domestic water heaters
(continued)
Figure 8-4_Multiple Water Heater Piping with Multiple Storage Tanks
COMMON MANIFOLD SIZE (Min.)
Models: 402, 502, 652, & 752
Diameter
Number of Units
GPM
(in.)
2
110
3
COMMON MANIFOLD SIZE (Min.)
Models: 992, 1262, 1442, 1802 & 2072
Diameter
Number of Units
GPM
(in.)
2
180
4
3
165
3 1/2
3
270
5
4
220
4
4
360
6
5
275
5
5
450
6
6
330
5
6
540
6
7
385
6
7
630
7
8
440
6
8
720
7
MIXING
VALVE
COLD
WATER
SUPPLY
BUILDING
HOT
WATER
SUPPLY
RELIEF
VALVE
MIN 4"
COMMON
MANIFOLD
SIZE
LOCK-TEMP
STORAGE
TANK
DRAIN
BUILDING
RETURN
NOTICE
Please note that these illustrations are meant to show system piping concept only, the installer is responsible
for all equipment and detailing required by local codes.
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Installation & Operation Manual
8
Domestic water heaters
TABLE 8C
COMMON WATER MANIFOLD SIZE FOR
MULTIPLE WATER HEATER INSTALLATIONS
Pipe sizing chart provides minimum pipe size for common
manifold piping to ensure adequate flow.
Common Manifold Size (Min.)
Models
Number of Water Heaters
402 - 752
992 - 2072
1
2"
2 1/2"
2
3"
4"
3
3 1/2"
5"
4
4"
6"
5
5"
6"
6
5"
6"
7
8
6"
7"
6"
7"
Pump operation
1. The water heater must have a properly sized circulating
pump. This pump is sized to circulate water between
the heater and the storage tank only.
2. The pump is sized to the heater input and water
chemistry specifications noted in the Water Chemistry
section on page 63.
3. The diameter and length of the piping installed between
the storage tank(s) and water heater must be properly
sized based on the capacity of the circulating pump.
4. The pump must run continuously when the water
heater is energized. This is the standard operating
system for a water heater.
A pump delay control function with an all bronze pump is
installed as standard equipment on all water heater systems.
The pump will operate only while there is a “Call for Heat”
and for a timed period after the water temperature set point
is satisfied to remove any residual heat from the combustion
chamber.
5. Lubricate pump to manufacturer’s recommendations.
Pump damage due to inadequate lubrication is
non-warrantable.
The tank sensor must be installed in the tapping provided in
the lower 25% of the storage tank to achieve proper operation.
As shipped from the factory, the tank sensor is in the literature
package shipped with the unit. Placing the sensor in the tapping
provided on the storage tank will improve temperature response
and prevent short cycles of operation.
68
The standard circulating pump on this water heater is sized
based on installation of a single storage tank and heater in close
proximity. If the number of fittings and straight pipe exceeds
the specified maximum equivalent number of straight feet
for a specified diameter of pipe, non-warrantable operational
problems may be experienced.
402 - 752 Models
1/4 HP, 120 VAC, 5.8 Amps
992 - 2072 Models
1/2 HP, 120 VAC, 7.4 Amps
The standard pump selection is based on the following pipe and
fittings from the water heater to the storage tank:
6 - 90° elbows
2 - ball valves
2 - unions
1 - cold water tee
Not more than 45 feet of straight pipe.
For every elbow and tee in excess of those shown above,
DEDUCT 6.5 FEET from the maximum allowable straight pipe
in the heater to tank circulating loop.
TABLE D
MINIMUM PUMP PERFORMANCE
Based on heating potable water with a hardness of 5 to 25
grains per gallon and total dissolved solids not exceeding
350 ppm. See Water Chemistry section on page 63.
Model
GPM Ft. Hd.
402 - 502 - 652 - 752
55
10
992 - 1262 - 1442 - 1802 - 2072
90
15
When installing multiple water heaters and/or multiple storage
tanks, the diameter of the inter-connecting pipe and all fittings
must be increased. An increase in pipe diameter will decrease
head loss in the system piping and ensure proper flow. Proper
pipe size between the heater and storage tank MUST be
maintained to ensure that the standard pump supplied on the
water heater will maintain desired flow.
When DHW Night Setback is enabled, the system pump output
can be used to control a building circulation pump. The pump
output will be on during the time Night Setback is not active
and will be off when Night Setback is active. A field installed
contactor must be used when controlling a circulation pump
larger than 1/6 HP.
Heat exchanger
On all models, header inspection plugs in the heat exchanger
can be removed for field inspection and cleaning of copper
tubes. The heat exchanger may be removed from the unit.
Installation & Operation Manual
8
Domestic water heaters
Thermostat adjustment procedure
1. Press the UP or DOWN key to view the set point
setting.
2. Press either the UP or DOWN key to increase or
decrease the displayed set point value.
3. Press the ENTER key to permanently store the new
set point into the control module’s memory.
(continued)
Inlet water temperatures below the specified minimum
recommendations can excessively cool the products of
combustion resulting in condensation on the heat exchanger.
Condensation on the heat exchanger can cause operational
problems, bad combustion, sooting, flue gas spillage and
reduced service life of the related components.
 CAUTION
Failure to press the ENTER key after changing the display
value will result in the set point reverting back to its
previous value after the current heat demand ends.
The control may be adjusted any time regardless of call for
heat status. When pressing the UP or DOWN key to enter
any new set points, the control module will immediately
begin controlling based on the new set point.
Minimum water temperatures (domestic
hot water use)
Domestic water temperatures:
This high efficiency water heater should be operated at a
temperature setting high enough to prevent condensing of
the products of combustion on the unit’s heat exchanger or
in the attached venting system. Use extreme caution when
storing water at elevated temperatures. A water temperature
setting maintained above the dew point of the products of
gas combustion should prevent condensate formation and
ensure proper performance of the venting system. The
manufacturer recommends the use of a properly sized
thermostatic mixing valve to supply domestic hot water at
temperatures less than 140°F (60°C). Storing the water at a
higher temperature and thermostatically mixing the water
will increase the available quantity of mixed hot water,
greatly reducing the possibility of condensate formation
on the heat exchanger or in the venting system and help
prevent the growth of water borne bacteria.
NOTICE
Adequate care MUST be taken to
prevent a potential scald injury when
storing water at elevated temperatures
for domestic use.
An appliance allowed to operate at return
temperatures below the specified minimum
setting may experience problems with
the operating controls, safety switches,
obstruction of the flue gas passages on the
heat exchanger, incomplete combustion,
and possible flue gas spillage. Sustained
operation at lower than specified water
temperatures may cause hazardous
conditions that may result in personal
injury or non-warrantable damage to the
appliance.
The maximum temperature set point that can be programmed
into the control module from the Operator Interface for water
heater operation is 190°F (88°C). The control is factory pre-set
at approximately 120°F (49°C). Facilities with small children or
invalids may require 120°F (49°C) or a lower temperature setting
to reduce risk of scald injury. Some states may require a lower
temperature setting. Check with your gas supplier for local
requirements governing the temperature setting. Remember,
no water heating system will provide exact temperature at all
times. Allow a few days of operation at this setting to determine
the correct temperature setting consistent with your needs.
NOTICE
1. This water heater, when set at the
lower temperature setting, is not capable of
producing hot water of sufficient temperature
for sanitizing purposes.
2. Higher stored water temperature
increases the ability of the water heater
to supply desired quantities of hot water,
however remember --
 CAUTION
Hotter water increases the risk of scald injury.
69
Installation & Operation Manual
8
Domestic water heaters
Figure 8-5_Danger Warning
A high limit control is located on the inside of the left front
panel, as shown in FIG. 8-6. The setting of this control knob
limits maximum discharge water temperature. The water
heater temperature limit control is adjustable up to a maximum
setting of 210°F (99°C). This water heater also includes a fixed
high water temperature limit control set to 200° (93.3°C). The
RESET key on the display must be pushed whenever water
temperature has exceeded the set point of the limit. The
temperature of the water in the heat exchanger must drop a
minimum of 15°F (8.3°C) below the setting of the high limit
control before the reset function can be activated. A high limit
message will be shown in the Operator Interface when water
temperature exceeds the high water temperature limit control
set point.
Location of Cold Water Supply Piping Connections
NOTICE
Incorrect piping of the cold water supply to the system may result
in excessive low temperature operation causing condensate
formation on the primary heat exchanger and operational
problems. The cold water supply piping must be installed in
the discharge piping from the heater to the storage tank. This
allows the cold water to be tempered in the storage tank before
entering the heater. See typical installation drawings provided
in this manual for correct piping (FIG.’s 8-1 thru 8-4). Higher
water temperatures reduce the volume of condensate formed.
 CAUTION
Setting the temperature selector to higher
settings provides hotter water, which
increases the risk of scald injury.
 WARNING
Should overheating occur or the gas supply
fail to shut off, do not turn off or disconnect
the electrical supply to the pump. Instead,
shut off the gas supply at a location external
to the appliance.
Optional adjustable auxiliary high water
temperature limit control
ADJUSTABLE
AUXILIARY
HIGH WATER
TEMPERATURE
LIMIT CONTROL
(OPTION)
Optional relief valve
This water heater is normally supplied with a temperature and
pressure relief valve sized in accordance with applicable codes.
Units may be supplied with an optional pressure only relief
valve. When a water heater is equipped with this optional relief
valve and is piped to a separate storage vessel, the storage vessel
must have a properly installed temperature and pressure relief
valve which complies with local codes.
Thermal expansion
A relief valve that discharges periodically may be due to thermal
expansion in a closed system. A water heater installed in a
closed system, such as one with a backflow preventer or check
valve installed in the cold water supply, shall be provided with
means to control expansion. Contact the water supplier or local
plumbing inspector on how to correct this situation. Never
plug or cap the relief valve discharge.
Cathodic protection
Hydrogen gas can be produced in a hot water system that has
not been used for a long period of time (generally two weeks
or more). Hydrogen gas is extremely flammable. To prevent
the possibility of injury under these conditions, we recommend
the hot water faucet be open for several minutes at the kitchen
sink before you use any electrical appliance which is connected
to the hot water system. If hydrogen is present, there will be
an unusual sound such as air escaping through the pipe as the
hot water begins to flow. There should be no smoking or open
flames near the faucet at the time it is open.
Figure 8-6_Adjustable Auxiliary High Water Temperature Limit Control
70
The high limit control will not reset until the
water temperature has dropped below the set
point of the high limit.
Installation & Operation Manual
9
Maintenance
Maintenance and annual startup
Table 9A_Service and Maintenance Schedules
Owner maintenance
Service technician
(see the following pages for instructions)
(see the Copper-fin II User’s Information Manual for
instructions)
• Check appliance area
General:
• Address reported problems
• Inspect interior; clean and vacuum if
necessary;
Daily
• Check pressure/temperature
gauge
• Check for leaks (water, gas, flue,
condensate)
ANNUAL START-UP
• Examine venting system
• Check system water pressure/system
piping/expansion tank
• Check vent piping
• Check control settings
• Check air piping
• Check igniter
Monthly
• Check relief valve
• Check wiring and connections
• Replace combustion air filter
Note: More frequent replacement may
be necessary in dirty environments.
• Check flue gas passageways
• Flame inspection (stable, uniform)
• Inspect and clean the burner
Periodically
• Check manifold gas pressure
• Perform
start-up
checkout
and
performance verification per Section 6 in
the Copper-fin II Installation and
Operation Manual.
If combustion
indicate need:
or
performance
• Test low water cutoff (if used)
• Reset button (low water cutoff)
Every
6 months
• Check appliance piping (gas and
water) for leaks
• Operate relief valve
• Clean heat exchanger with a stiff bristle
brush
• Remove and clean burners
water. Dry before re-assembling.
using
• Clean the blower wheel with a brush and
vacuum. Do not let dirt from cleaning get
pulled into the blower.
End
of season
months
• Shut appliance down (unless
boiler used for domestic hot
water)
71
Installation & Operation Manual
9
Maintenance
 WARNING
Follow the service and maintenance procedures given throughout this manual and in component literature
shipped with the appliance. Failure to perform the service and maintenance could result in damage to the
appliance or system. Failure to follow the directions in this manual and component literature could result in
severe personal injury, death, or substantial property damage.
 WARNING The appliance should be inspected annually only by a qualified service technician. In addition, the maintenance
and care of the appliance designated in Table 9A and explained on the following pages must be performed to
assure maximum appliance efficiency and reliability. Failure to service and maintain the appliance and system
could result in equipment failure.
 WARNING
Electrical shock hazard – Turn off power to the appliance before any service operation on the appliance except as
noted otherwise in this instruction manual. Failure to turn off electrical power could result in electrical shock,
causing severe personal injury or death.
Address reported problems
Check water system
1. Inspect any problems reported by the owner and correct
before proceeding.
1. Verify all system components are correctly installed and
operational.
Inspect appliance area
1. Verify that appliance area is free of any combustible
materials, gasoline and other flammable vapors and liquids.
Inspect appliance interior
1. Remove the outer access panels and inspect the interior of
the appliance.
2. Vacuum any sediment from inside the appliance and
components. Remove any obstructions.
Check all piping for leaks
 WARNING
Eliminate all system or appliance leaks.
Continual fresh makeup water will reduce
appliance life. Minerals can build up in
sections, reducing heat transfer, overheating
heat exchanger, and causing heat exchanger
failure. Leaking water may also cause severe
property damage.
1. Inspect all water and gas piping and verify to be leak free.
2. Look for signs of leaking lines and correct any problems
found.
3. Check gas line using the procedure found in Section 3 - Gas
Connections of the Copper-fin II Installation and Operation
Manual.
Flue vent system and air piping
1. Check for gastight seal at every connection, seam of air
piping, and vent piping periodically inspected by a qualified
service agency.
 WARNING Venting system must be sealed gastight
to prevent flue gas spillage and carbon
monoxide emissions, which will result in
severe personal injury or death.
72
2. Check the cold fill pressure for the system. Verify it is
correct (must be a minimum of 12 PSI).
3. Watch the system pressure as the boiler heats up (during
testing) to ensure pressure does not rise too high. Excessive
pressure rise indicates expansion tank sizing or performance
problem.
4. Inspect automatic air vents and air separators. Remove air
vent caps and briefly press push valve to flush vent. Replace
caps. Make sure vents do not leak. Replace any leaking
vents.
Check expansion tank
1. Expansion tanks provide space for water to move in and
out as the heating system water expands due to temperature
increase or contracts as the water cools. Tanks may be open,
closed, diaphragm or bladder type. See Section 4 - Water
Connections of the Copper-fin II Installation and Operation
Manual for suggested best location of expansion tanks and
air eliminators.
Installation & Operation Manual
9
Maintenance
(continued)
Check relief valve
Inspect/replace hot surface igniter
1. Inspect the relief valve and lift the lever to verify flow.
Before operating any relief valve, ensure that it is piped with
its discharge in a safe area to avoid severe scald potential.
Read Section 4 - Water Connections of the Copper-fin
II Installation and Operation Manual before proceeding
further.
This unit uses a proven SMART SYSTEM control module and
a hot surface igniter. The SMART SYSTEM control module is
not repairable. Any modification or repairs will invalidate the
warranty.
 WARNING
 WARNING
Safety relief valves should be re-inspected
AT LEAST ONCE EVERY THREE YEARS,
by a licensed plumbing contractor or
authorized inspection agency, to ensure
that the product has not been affected by
corrosive water conditions and to ensure
that the valve and discharge line have not
been altered or tampered with illegally.
Certain naturally occurring conditions may
corrode the valve or its components over
time, rendering the valve inoperative. Such
conditions are not detectable unless the
valve and its components are physically
removed and inspected. This inspection
must only be conducted by a plumbing
contractor or authorized inspection agency
– not by the owner. Failure to re-inspect the
boiler relief valve as directed could result in
unsafe pressure buildup, which can result in
severe personal injury, death, or substantial
property damage.
Following installation, the valve lever must
be operated AT LEAST ONCE A YEAR to
ensure that waterways are clear. Certain
naturally occurring mineral deposits may
adhere to the valve, rendering it inoperative.
When manually operating the lever, water
will discharge and precautions must be taken
to avoid contact with hot water and to avoid
water damage. Before operating lever, check
to see that a discharge line is connected to
this valve directing the flow of hot water
from the valve to a proper place of disposal.
Otherwise severe personal injury may result.
If no water flows, valve is inoperative. Shut
down the appliance until a new relief valve
has been installed.
2. After following the above warning directions, if the relief
valve weeps or will not seat properly, replace the relief valve.
Ensure that the reason for relief valve weeping is the valve
and not over-pressurization of the system due to expansion
tank waterlogging or undersizing.
 WARNING
Do not attempt to repair a faulty hot surface
igniter or control module. Any modification
or repairs may create hazardous conditions
that result in property damage, personal
injury, fire, explosion and/or toxic gases.
A faulty hot surface igniter or control module must be replaced
with an identical part. A specification igniter and control
module for this specific unit is available from your local
distributor. Do not use general purpose field replacement
control modules or igniters.
Ignition system checkout
1.
Turn off gas supply to unit.
2.
Turn electric power on.
3.
Adjust the set point on the temperature control to a
setting above water temperature or to the highest safe
setting.
4.
The igniter will cycle on trial for ignition.
5.
The control module will lock out and turn the alarm
light on.
6.
Adjust the Set Point Differential and High-Fire Offset to
the desired settings.
7.
Turn on gas supply.
8.
Press the RESET button at the electronic display panel to
reset the control module.
9.
If ignition system fails to operate properly, repair work
must be performed by a qualified service person or
installer.
Check all wiring
1. Inspect all wiring, making sure wires are in good condition
and securely attached.
Check control settings
1. Set the SMART SYSTEM control module display to
Parameter Mode and check all settings. See Section 1 of this
manual. Adjust settings if necessary. See Section 1 of this
manual for adjustment procedures.
2. Check settings of external limit controls (if any) and adjust
if necessary.
73
Installation & Operation Manual
9
Maintenance
Perform start-up and checks
Check flue gas passageways
1. Start appliance and perform checks and tests specified in
Section 7 - Start-up of the Copper-fin II Installation and
Operation Manual.
Any sign of soot around the inner jacket, outer jacket, flue
pipe connections, burner or in the areas between the fins on
the copper heat exchanger indicates a need for cleaning. The
following cleaning procedure must only be performed by a
qualified serviceman or installer. Proper service is required to
maintain safe operation. Properly installed and adjusted units
seldom need flue cleaning.
2.
Verify cold fill pressure is correct and that operating
pressure does not go too high.
Check burner flame
Visually check main burner flames at each start-up after long
shutdown periods or at least every six months. A burner
viewport is located on the burner mounting flange.
 WARNING The area around the burner viewport is hot
and direct contact could result in burns.
NOTICE
 CAUTION
Figure 9-2_Flame Pattern Illustration
All gaskets/sealants on disassembled
components or jacket panels must be replaced
with new gaskets/sealants on reassembly.
Gasket and sealant kits are available from
your distributor.
When a Category IV vent system is
disconnected for any reason, the flue must
be reassembled and resealed according to the
vent manufacturer’s instructions.
Inspect and clean burner
NORMAL
YELLOW FLAME
YELLOW TIP
FLAME LIFT
Normal Flame: A normal flame at 100% of burner input is
blue, with slight yellow tips, a well defined flame and no flame
lifting.
Yellow Tip: Yellow tipping can be caused by blockage or partial
obstruction of air flow to the burner.
1.
Turn off main power to unit.
2.
Turn off main manual gas shutoff to unit.
3.
Remove the front outer jacket panels.
4.
Disconnect manifold from gas train using union(s) just
below each gas valve(s).
5.
Remove mounting screws from manifold mounting
brackets. Pull the manifold/orifice assembly away from
burners. Repeat for each manifold assembly.
6.
Remove two mounting screws from burner and slide
burner out toward front of unit. Use caution to prevent
damage to burners, refractory, hot surface igniter or wiring.
7.
Remove soot from burners with a stiff bristle brush.
Yellow Flames: Yellow flames can be caused by blockage of
primary air flow to the burner or excessive gas input. This
condition MUST be corrected immediately.
Dirt may be removed from burner ports by rinsing the
burner thoroughly with water. Drain and dry burners
before re-installing. Damaged burners must be replaced.
Lifting Flames: Lifting flames can be caused by over firing the
burner, excessive primary air or high draft.
When installed in a dusty and dirty location, the burners may
require cleaning on a 3 to 6 month schedule or as needed, based
on severity of contamination. Contaminants can be drawn in
with the combustion air. Non combustible particulate matter
such as dust, dirt, concrete dust or dry wall dust can block
burner ports and cause non-warrantable failure. The standard
inlet air filter will help eliminate dust and dirt from entering
the unit. Use extreme care when operating a unit for temporary
heat during new construction. The burners could require a
thorough cleaning before the unit is placed in service.
If improper flame is observed, examine the venting system,
ensure proper gas supply and adequate supply of combustion
and ventilation air.
74
Installation & Operation Manual
9
Maintenance
(continued)
Inspect and clean the heat exchanger
1.
While burners are removed, check the heat exchanger
surface for sooting. If present, heat exchanger must be
cleaned and problem corrected. Proceed as follows.
2.
Remove gas manifold(s)/orifice assemblies as described
in steps 1 through 5 in Burner Removal and Cleaning,
page 74.
3.
Disconnect wiring from the hot surface igniter and
hose from the burner pressure tap.
4.
Remove inner jacket panel mounting screws and slide
door assembly out toward front of the unit. Use
caution to prevent damage to the refractory and hot
surface igniter.
5.
Check “V” baffles and frame runners along front
and back edges of heat exchanger. Remove and clean if
necessary.
6.
Remove soot from heat exchanger with a stiff bristle
brush. Use a vacuum to remove loose soot from
surfaces and inner chamber.
7.
The heat exchanger can be removed by sliding towards
the front of the unit. Once the heat exchanger is
removed from the unit, a garden hose can be used
to wash the tubes to ensure that all soot is removed
from the heat exchanger surfaces. Note: Do not wet the
unit’s refractory.
8.
Ensure that all burner ports are cleaned to remove any
soot. See Burner Removal and Cleaning, page 74.
9.
Carefully reinstall the heat exchanger, “V” baffles, and
frame runners if removed from the unit. Note: Make
sure frame runners seal securely where they contact the
front and rear compartment refractory.
HEAT
EXCHANGER
Figure 9-3_Location of the Heat Exchanger Inside
Jacket
Review with owner
1. Review the Copper-fin II User’s Information Manual with
the owner.
2. Emphasize the need to perform the maintenance schedule
specified in the Copper-fin II User’s Information Manual
(and in this manual as well).
3. Remind the owner of the need to call a licensed contractor
should the appliance or system exhibit any unusual behavior.
4. Remind the owner to follow the proper shutdown procedure
and to schedule an annual start-up at the beginning of the
next heating season.
10. Carefully reinstall inner jacket panels, burners, Oiled bearing circulators
manifolds, wires and hoses. Use new gasket material to
Inspect the pump every six (6) months and oil as necessary. Use
ensure a proper air seal.
SAE 30 non-detergent oil or lubricant specified by the pump
11. Reassemble all gas and water piping. Test for gas leaks.
manufacturer.
Upon
completion
of
any
testing
on
the
gas
NOTICE
system, leak test all gas connections with a
soap and water solution while main burners
are operating. Do not spray soap and water
solution on the SMART SYSTEM control
module housing. The use of an excessive
amount of soap and water solution can
damage the control. Immediately repair
any leak found in the gas train or related
components. Do not operate an appliance
with a leak in the gas train, valves, or related
piping.
12. Reassemble outer jacket panels.
13. Cycle unit and check for proper operation.
75
Installation & Operation Manual
10
Connection diagram
FIELD WIRING
+ ALARM
1 + CONTACTS
2
3 + RUNTIME
TO MONITORING DEVICE
+ CONTACTS
4
+ OPEN
OPEN
3-WAY
5
24V
+ CLOSE
CLOSE
CN4
VALVE
6 + COM
COMMON
7 +
S1
STAGE #1
8
S1
9 +
+ S2
CONNECT
STAGE #2
10
S2
TO
11 +
TERMINAL
12 + S3
STAGE #3
#19
S3
+
13
(LOUVER
14 + S4
STAGE #4
RELAY)
+
S4
15
COM
FIELD CN5
16 + LOUVER PROVING
SWITCH
SUPPLIED
PROVE
+
17
+ LOUVER RELAY
LINE
WIRING
R
18
M
+ COIL
19 +
NEU
TANK
20
AQUASTAT
+ AQUASTAT
21 CN3
TANK
SENSOR
22 + TANK
+ SENSOR
23
24 + SHIELD
CN6
+ A
UNITS
25
B
26 + SHIELD
+
27
FROM
0-10V DC IN
28 + +0-10V
BMS
+ -BMS IN
COMMON
29
0-10V DC OUT
TO
30 + +0-10V
+ -RATE OUT
COMMON
BMS
31
CN1
32 + SHIELD
MOD
+ A
BUS
33
B
+
34
BMS
SHIELD
35 +
CN2
POOL
OUT
SAFETY
OUTDOOR
BK DOOR
10K 1 + SENSOR
SUPPLY
AIR
G
+
10K 20K
2
+ SYS SUPPLY
R
3
10K/20K W
10K
SENSOR
10K
+
10K
4
+ SYS RETURN
POOL/BOILER 10K
5
CN1
+ SENSOR10K
FROM
6
0-10V DC IN
+ 0-10V SYS
PUMP
7
+ - PUMP IN
COMMON
OUTPUT
8 CN2
OPT. ALARM HARNESS
TO MONITORING DEVICE
PR 1
3-WAY
VALVE
BL 2
Y
LOUVERS
STAGING
BR
R/O
3
T/W
4
Y
5
BL
6
3
5
P
DIGITAL HARNESS
6
P
7 BR/W
8
R
9
R/BK
10
R/W
G
12
GY
10
BK/W
8
BK
6
P
4
BR/W
2
F2
7 GY
F4
3 W
X1
1 PR
11 GY
12 W/BK
CONTR
F5
Y
CASCADE
1
BR/W 3
BL
4
PR
5
6
R/W
7
BR
BK
8
Y/G
9
BL/BK
GY/W 2
GY/W 1
10
O/R
P
X2
F6
Y 3
2
Y
4
R
1
MODBUS
MODULE
CONNECTIONS
POO L SUP
SENSO R
MODBUS
1
LOW VOLT HARNES
4 PR
1
5
2
T
BK
4
PR
3
PR
2
P
1
P
X3
6 W/R
X10
7 R/BK
X12
8 BK/R
X9
BOILER/POOL HEATER
SAFETY
OUTLET
SENSOR
INLET
SENSOR
10K/20K
G
4
W
3
10K
2
1
W/BK 2
BK
R
W
1
4
Y
3
Y
DISPLAY
BR
BR
24V COM
G
MAIN POWER HARNESS
OPT. MODBUS HARNESS
SYSTEM PUMP
RELAY COIL R
120V
W
P
Y
2
BL 3
3
2 Y
BL
CKT. BREAKER
G
BR
BR
BR
BR
BK
G
BR/
W
BK
W
120V/60Hz NEUTRAL
SUPPLY
LINE
76
60VA
PR
1HP UNIT
MAX PUMP
GROUND
1 BK
3 W
BK
1
G 2
3
W
S3/S4
Y
S1/S2
24V
W
CONTROLLER
XFMR
120V
IND-DHW PUMP
RELAY COIL R
120V
Y
24V
GROUND
BK
CHASSIS
GROUND
W
ON/OFF
SWITCH
2
GY/W 4
GY/W 6
120V
AC
PUMP RELAY
120VAC COIL
W
BK/W
Y
4
Y
5
Y
6
BL
1
R/O
2
R/W
3
1
BL
2
R
4
Y
5
Y
6 Y
3 R/BK
1
GY
GY 1
3
GY
GY 3
5
G
G
IGNITER
2
4
1
BK
3
G
5 BK/R
MAIN UNIT
5
Installation & Operation Manual
Connection diagram
W VOLT HARNESS
Notes:
1. All wiring must be installed in accordance with : local, state , provincial and national code requirements per either
N.E.C. in USA or C.S.A. in Canada.
2. If any original equipment wire as supplied with the appliance must be replaced , it must be replaced with wire
having same wire gauge (AWG) and rated for a minimum of 105°C
3. Actual connector block locations may vary from those shown on diagrams . Refer to actual components for
proper connector block locations when using diagrams to trouble shoot unit .
OPT. ALARM
GITAL HARNESS
R/BK 1
X13
F2
X8
F4
Y
1
W
2
BL
3
BL
19 GY
17 BR/W
5
O 1
O/BK 2
14 BK
13 W/R
12
10
O/R
4
BL
1
R
2
O/R
5
R/O
6
BR
7
Y
12
T
13
GY
O/R 2
BL 1
1
R/O
2
R/W 3
4
5
6
1
2
BL
14 T/W
1
3
PR
2
1
Y BL BL
PR
3
2
P
1
PR
PR
Y
R
BL
120V
LO - GAS
2
1
R Y R
R Y R
1 2 3
1 2 3
4 Y
R
2 O
1 O/BK
SILENCING
SWITCH
2
16 BR/W
1 C 2
NC C NO
AUXILLIARY
1
DIGITAL
HARNESS
HI-LIMIT
ALARM
BELL
ALARM RELAY
120VAC COIL
GY
O
2
3
G
GROUNDING
OPTION
JUMPER
LOW VOLT HARNESS
1
2
3
O O/BK
R/BKY R/BK R/O Y R/O R/O Y R/O R/W Y R/W
1 2 3
1 2 3
1 2 3
1 2 3
S1
S1
S2
S3
S3
S4
1
2
3
4
5
6
LOW GAS
SWITCH STAGE #1
6 Y
STAGE #1
STAGE #2
BURNER
#1 HSI GROUND
R
GY 1
GY 3
G 5
1 BK
HI
HI
2
LO
LO
R
3 W
4
G
NEU
GND
R
STAGE #3
STAGE #3
2
GY
G
G
GY
BK/
W
BK/
W
BLOWER RELAY
120VAC COIL
G
BK/R 5
TO
PWR
HI/LO SPEED RELAY
120VAC COIL
2
W
4 BK/W
!
DANGER
TO PREVENT ELECTRICAL SHOCK
THIS HEATER MAY BE CONNECTED TO MORE THAN ONE BRANCH
CIRCUIT. MORE THAN ONE DISCONNECT SWITCH MAY BE
REQUIRED TO DE-ENERGIZE THE EQUIPMENT FOR SERVICING.
BK
BK
W
W
GAS VALVE XFMR
FIELD
OPTIONS
WIRE COLOR REFERENCE
BL
MAIN UNIT HARNESS
50VA
60VA
75VA
100VA
BK 1 TO
1
2
3
W 3 XFMR
W
MODBUS ADAPTER
FACTORY
OPTIONS
BL
CIRCUIT
BREAKER
G
TO
CONNECTION
BOARD
2
W
120V
24V
3
BK
BK/ BK/
R W R
HI LO
120V
120V
1
G
BK
1
BL
G
2
120V
W
4 GY/W
BK
2
1 3
GY/W
6 GY/W
R
STAGE #4
BURNER
#2 HSI GROUND
GY/W
BK 1
NEU W 3
GND G 4
BK
5 Y
1
4
P
6
5
4
2-SPD BLOWER
3 R/BK
MAIN UNIT
LWCO
24VAC
15
12 R/W
BL
NITER
4
2 O/BK
1 O
2
1
O/BK
R
NOTE: NUMBER OF GAS VALVES VARIES BY MODEL
O/
O
BK
BL
5
CONNECTION
BOARD
O
CONSULT
FACTORY
SPLAY
6
TEST
LWCO
PROBE
+ +
X9
1
6 5
2
1
BL
R
IDENTIFICATION PLUG
MODEL SPECIFIC
X11
2
RESET
G
CHASSIS
GROUND
O
X6
X5
X4
3
HI-GAS
11 W/BK
4
BL
FLOW
SWITCH
O/BK
O/BK 3
R
P
PR
10
T
4 O
FLUE
COM
SWITCH
NO
AIR PROVE
COM SWTICH
BL
8
3
LOW
VOLTAGE
HARNESS
T
O/BK
O/BK
NC BLOCK
T
W
11
2
1 O
2 O/BK
12 R/W
R
X7
Y
FLOW SWITCH
12 BL/BK
15
7
BL 1
2 Y
4
16 BK/R
W/BK 8
CONTROLLER
O
BL
LWCO
1 BL
18 Y/G
R/BK 6
BR
T
20
(continued)
~~~~
~~~~
~~~~
10
BL
BL
Y
Y
W = WHITE
BK = BLACK
PR=PURPLE
BL=BLUE
P=PINK
O=ORANGE
Y/G = YELLOW WITH
T=TAN
Y=YELLOW
BR=BROWN
G=GREEN
GY=GRAY
R=RED
GREEN STRIPE
LBL20082 REV A
77
L
78
5A
F6
5A
F5
X2-1
X2-2
CIRCUIT BREAKER
X12-5
X12-6
STAGE 3 GAS VALVE
STAGE 4 GAS VALVE
X12-2
X12-3
X6-4
X12-1
X10-6
X10-3
STAGE 2 GAS VALVE
CHASSIS
120 VAC
LOW VOLTAGE
BOX DEPICTS
OPTIONAL ITEMS
X10-5
X1-3
X1-2
X1-12
X1-3
UNIT PUMP
RELAY
INTERGRATED CONTROL BOARD
X10-1
X10-2 STAGE 1 GAS VALVE
TRANSFORMER
TRANSFORMER
DHW PUMP
RELAY
(BOILER)
G
X12-4
X10-4
WHERE POSSIBLE, SWITCHES ARE SHOWN WITHOUT UTILITIES (GAS,
WATER OR ELECTRICITY) CONNECTED TO THE UNIT. AS SUCH, ACTUAL
SWITCH STATES MAY VARY FROM THOSE SHOWN ON DIAGRAMS
DEPENDING UPON WHETHER UTILITIES ARE CONNECTED OR A FAULT
CONDITION IS PRESENT. SEE WIRING DIAGRAM FOR ADDITIONAL NOTES.
MANUAL RESET
HIGH LIMIT
X1-10
STAGE 3 HSI
X1-7
STAGE 1 HSI
X1-4
UNIT PUMP RELAY
HI/LO SPEED RELAY
BLOWER RELAY
N
BLOWER
SYSTEM /
TERMINAL
TERMINAL
RECIRC
STRIP
STRIP
PUMP RELAY
LOW
SPEED
HIGH
SPEED
MODBUS INTERFACE BOARD
CIRCUIT BREAKER OR FUSE
X1-1
X1-2
F4
X1-1
X2-4
3.15A
5A
X1-8
F2
INTERGRATED
CONTROL
BOARD
HI/LO SPEED
RELAY
HI/LO SPEED
RELAY
N
11
X1
-6
ON/OFF
SWITCH
BLOWER
RELAY
TERMINAL
STRIP
Installation & Operation Manual
Ladder diagram
LOW WATER
CUTOFF
X6-7
X6-11
X6-14
CN5-12
CN5-4
B
COMPUTER
DISPLAY BOARD
X8-16
X8-6
X8-17
X8-7
CN6-7
CN6-3
X7-4
X7-8
CN6-5
CN6-10
X8-15
X8-5
CN6-9
CONNECTION BOARD 2
CN1-7
+
SYSTEM PUMP
CN1-8
SPEED INPUT
-
CASCADE
A
0-10V +
RATE
OUTPUT -
0-10V +
BMS
INPUT -
CN6-4
X6-15
CN5-10
STAGE 4
TANK TSTAT
LOUVER PROVING
X6-6
CN5-3
STAGE 3
X13-1
CN5-9
X6-2
X6-16
CN5-8
CN5-7
CN5-1
X6-1
X6-5
X6-12
STAGE 2
CLOSE
OPEN
PROBE
TEST
X6-3
X11
X4
CN5-11
10K
X8-20
X8-10
X8-18
X8-12
X8-1
X8-8
X4-2
X4-1
X4-3
CN1
-1
MODBUS
INTERFACE
BOARD
X6-2
X6-1
X6-3
CN1-2
CN1-3
CN1-1
CN6-8
CASCADE
SHIELD
TANK
SENSOR S4
CONNECTION BOARD 1
CN6
-1
2ND OUTLET SENSOR S9
OUTLET SENSOR S1
X8-2
SYSTEM / POOL
RETURN
SENSOR S7
INLET SENSOR S2
CN6-6
CN1-6
CN1-5
SYSTEM / POOL
SUPPLY
SENSOR S6
20K
2ND POOL
SUPPLY
SENSOR S8
OUTDOOR
SENSOR S5
CONNECTION BOARD 2
RUNTIME
CONTACTS
LOUVER RELAY
X8-3
X8-13
X8-14
POOL
X8-19
X8-11
BOILER
CN1-2
CN4-6
X3-2
X6-10
CN4-5
X3-1
X6-13
ALARM
2
1
B
A
MODBUS
RTU
SHIELD
CN5-5
ALARM
CONTACTS
CONNECTION
BOARD 1
CONNECTION BOARD 1
SILENCE
CN4-4
X3-4
ALARM RELAY
CN4-1
X3-3
Ladder diagram
STAGE 1 / ENABLE
24V COM
24V
3 WAY VALVE
CONNECTION BOARD 1
HIGH GAS
PRESS SWITCH
BLOCKED FLUE
RESET
J2
-2
J3-3
FLOW SWITCH
((
(
((
CN5-6
LOW GAS PRESS
J2
-1
J2-3
J3-4
J3-2
11
AIR PRESSURE
J3-5
J3-6
Installation & Operation Manual
(continued)
LBL20083 REV B
79
Revision Notes: Revision A (ECO #C08226) initial release.
Revision B (ECO C09691) reflects the update of AHRI and ASME logos
on page 8.
Revision C (ECO C11124) reflects the modification of ignition timing
information on pages 55 and 58 as well as the addition of VAL30002 in
Table 4A on page 36.
Revision D (ECO C11706) reflects the update of heat exchanger
information on page 68 and system return sensor information on page
45.
CFX-CHX-I-O Rev D
11/12
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