Amana | GULA | Operating instructions | Amana GULA Operating instructions

Heating & Air Conditioning
®
C om fort. Q uality. Tru st.
GAS FIRED WARM AIR FURNACE
INSTALLATION INSTRUCTIONS
*GUCA/GCCA/GULA
Installer: Affix all manuals adjacent to the unit.
*Type FSP Category IV Direct or Non
Direct Vent Forced Air Furnace.
These furnaces comply with requirements embodied
in the American National Standard / National Standard of Canada ANSI Z21.47·CSA-2.3 Gas Fired
Central Furnaces.
Part No. 10318740
Printed in USA
DESIG N
CE R T I F I E D
CE
R TI FIE D
Goodman Company, L.P.
1810 Wilson Parkway • Fayetteville, Tennessee 37334
www.amana-hac.com
January 2003
Table of Contents
I. Component Identification .......................................................................................................................................... 5
II. Safety .......................................................................................................................................................................... 6
ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS .................................................................................................................................... 6
III. Product Application .................................................................................................................................................. 6
IV. Location Requirements and Considerations .......................................................................................................... 7
GENERAL ............................................................................................................................................................................................................. 7
CLEARANCES AND ACCESSIBILITY ................................................................................................................................................................. 8
FURNACE SUSPENSION .................................................................................................................................................................................... 8
EXISTING FURNACE REMOVAL ........................................................................................................................................................................ 8
THERMOSTAT LOCATION ................................................................................................................................................................................... 9
V. Combustion & Ventilation Air Requirements ........................................................................................................... 9
VI. Installation Positions ............................................................................................................................................. 12
VII. Horizontal Applications & Considerations .......................................................................................................... 12
GENERAL ........................................................................................................................................................................................................... 12
DRAIN TRAP AND LINES ................................................................................................................................................................................... 12
LEVELING ........................................................................................................................................................................................................... 12
ALTERNATE VENT/FLUE AND COMBUSTION AIR CONNECTIONS ............................................................................................................. 12
ALTERNATE ELECTRICAL AND GAS LINE CONNECTIONS .......................................................................................................................... 13
DRAIN PAN ......................................................................................................................................................................................................... 13
FREEZE PROTECTION ..................................................................................................................................................................................... 13
FURNACE SUSPENSION .................................................................................................................................................................................. 13
VIII. Propane Gas and/or ............................................................................................................................................. 13
High Altitude Installations ........................................................................................................................................... 13
IX. Vent/Flue Pipe ......................................................................................................................................................... 13
& Combustion Air Pipe ................................................................................................................................................ 13
GENERAL ........................................................................................................................................................................................................... 13
DUAL CERTIFICATION: NON-DIRECT/DIRECT VENT .................................................................................................................................... 13
MATERIALS AND JOINING METHODS ............................................................................................................................................................ 14
PROPER VENT/FLUE AND COMBUSTION AIR PIPING PRACTICES ........................................................................................................... 14
TERMINATION LOCATIONS .............................................................................................................................................................................. 14
CANADIAN VENTING REQUIREMENTS .......................................................................................................................................................... 15
STANDARD FURNACE CONNECTIONS .......................................................................................................................................................... 15
Vent/Flue Pipe ............................................................................................................................................................................................. 15
Combustion Air Pipe ................................................................................................................................................................................... 15
Direct Vent Installations .............................................................................................................................................................................. 15
Non-Direct Vent Installations ...................................................................................................................................................................... 15
ALTERNATE FURNACE CONNECTIONS ......................................................................................................................................................... 15
Alternate Vent/Flue Location ...................................................................................................................................................................... 16
Alternate Combustion Air Intake Location .................................................................................................................................................. 17
NON-DIRECT VENT (SINGLE PIPE) PIPING ................................................................................................................................................... 18
Vent/Flue Pipe Lengths and Diameters ...................................................................................................................................................... 18
Vent/Flue Pipe Terminations ....................................................................................................................................................................... 18
DIRECT VENT (DUAL PIPE) PIPING ................................................................................................................................................................ 19
Vent/Flue and Combustion Air Pipe Lengths and Diameters ..................................................................................................................... 19
Vent/Flue and Combustion Air Pipe Terminations ...................................................................................................................................... 19
VENT/INTAKE TERMINATIONS FOR INSTALLATION OF MULTIPLE DIRECT VENT FURNACES .............................................................. 20
CONCENTRIC VENT TERMINATION ................................................................................................................................................................ 20
X. Condensate Drain Lines & Drain Trap ................................................................................................................... 21
GENERAL ........................................................................................................................................................................................................... 21
UPRIGHT INSTALLATIONS ............................................................................................................................................................................... 21
Standard Right or Left Side Drain Hose Connections ................................................................................................................................ 21
Alternate Vent/Flue Drain Hose Connections ............................................................................................................................................. 22
Upright Drain Trap Mounting (Left or Right Side Panel) ............................................................................................................................. 23
HORIZONTAL INSTALLATIONS ......................................................................................................................................................................... 23
Right Side Down ......................................................................................................................................................................................... 23
Left Side Down ............................................................................................................................................................................................ 23
Horizontal Drain Trap Mounting (Left or Right Side Panel) ........................................................................................................................ 24
XI. Electrical Connections ........................................................................................................................................... 25
WIRING HARNESS ............................................................................................................................................................................................ 25
115 VOLT LINE CONNECTIONS ....................................................................................................................................................................... 25
24 VOLT THERMOSTAT WIRING ...................................................................................................................................................................... 26
115 VOLT LINE CONNECTION OF ACCESSORIES (HUMIDIFIER AND ELECTRONIC AIR CLEANER) .................................................... 26
2
Table of Contents
XII. Gas Supply and Piping ......................................................................................................................................... 27
GENERAL ........................................................................................................................................................................................................... 27
High Altitude Derate .................................................................................................................................................................................... 27
Propane Gas Conversion ............................................................................................................................................................................ 27
Gas Valve .................................................................................................................................................................................................... 27
GAS PIPING CONNECTIONS ............................................................................................................................................................................ 27
General ........................................................................................................................................................................................................ 27
Direct/Standard Inlet Piping ........................................................................................................................................................................ 29
Indirect/Alternate Inlet Piping ...................................................................................................................................................................... 29
Gas Piping Checks ..................................................................................................................................................................................... 29
Propane Gas Piping Charts ........................................................................................................................................................................ 30
Propane Gas Tanks and Piping .................................................................................................................................................................. 31
XIII. Circulating Air & Filters ....................................................................................................................................... 31
DUCTWORK - AIR FLOW .................................................................................................................................................................................. 31
FILTERS - READ THIS SECTION BEFORE INSTALLING THE RETURN AIR DUCTWORK .......................................................................... 31
UPRIGHT INSTALLATIONS ............................................................................................................................................................................... 32
HORIZONTAL INSTALLATIONS ......................................................................................................................................................................... 32
XIV. Startup Procedure & Adjustment ........................................................................................................................ 32
HEAT ANTICIPATOR SETTING ......................................................................................................................................................................... 32
DRAIN TRAP PRIMING ...................................................................................................................................................................................... 32
FURNACE OPERATION ..................................................................................................................................................................................... 32
Furnace Startup .......................................................................................................................................................................................... 32
Furnace Shutdown ...................................................................................................................................................................................... 33
GAS SUPPLY PRESSURE MEASUREMENT ................................................................................................................................................... 33
White-Rodgers 36F22 Gas Valve ............................................................................................................................................................... 33
White-Rodgers 36G22 Gas Valve .............................................................................................................................................................. 34
GAS MANIFOLD PRESSURE MEASUREMENT AND ADJUSTMENT ............................................................................................................ 34
White-Rodgers 36F22 Gas Valve ............................................................................................................................................................... 34
White-Rodgers 36G22 Gas Valve .............................................................................................................................................................. 34
GAS INPUT RATE MEASUREMENT (NATURAL GAS ONLY) ......................................................................................................................... 35
TEMPERATURE RISE ........................................................................................................................................................................................ 35
CIRCULATOR BLOWER SPEEDS ..................................................................................................................................................................... 36
BLOWER HEAT OFF DELAY TIMINGS ............................................................................................................................................................. 36
XV. Normal Sequence of Operation ............................................................................................................................ 38
POWER UP ......................................................................................................................................................................................................... 38
HEATING MODE ................................................................................................................................................................................................. 38
COOLING MODE ................................................................................................................................................................................................ 38
FAN ONLY MODE ............................................................................................................................................................................................... 38
XVI. Operational Checks ............................................................................................................................................. 38
BURNER FLAME ................................................................................................................................................................................................ 38
PRIMARY LIMIT .................................................................................................................................................................................................. 39
XVII. Safety Circuit Description .................................................................................................................................. 39
GENERAL ........................................................................................................................................................................................................... 39
INTEGRATED CONTROL MODULE .................................................................................................................................................................. 39
PRIMARY LIMIT .................................................................................................................................................................................................. 39
AUXILIARY LIMIT ............................................................................................................................................................................................... 39
ROLLOUT LIMIT ................................................................................................................................................................................................. 39
PRESSURE SWITCHES .................................................................................................................................................................................... 39
FLAME SENSOR ................................................................................................................................................................................................ 39
XVIII. Troubleshooting ................................................................................................................................................. 40
ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS .................................................................................................................................. 40
DIAGNOSTIC CHART ......................................................................................................................................................................................... 40
RESETTING FROM LOCKOUT ......................................................................................................................................................................... 40
XIX. Maintenance ......................................................................................................................................................... 40
ANNUAL INSPECTION ....................................................................................................................................................................................... 40
FILTERS .............................................................................................................................................................................................................. 40
Maintenance ................................................................................................................................................................................................ 40
Filter Removal ............................................................................................................................................................................................. 43
UPRIGHT UPFLOW FILTER REMOVAL ............................................................................................................................................... 43
HORIZONTAL UNIT FILTER REMOVAL ................................................................................................................................................ 43
MEDIA AIR FILTER OR ELECTRONIC AIR CLEANER REMOVAL ...................................................................................................... 43
BURNERS ........................................................................................................................................................................................................... 43
INDUCED DRAFT AND CIRCULATOR BLOWERS ........................................................................................................................................... 43
CONDENSATE TRAP AND DRAIN SYSTEM (QUALIFIED SERVICER ONLY) ............................................................................................... 44
FLAME SENSOR (QUALIFIED SERVICER ONLY) ........................................................................................................................................... 44
FLUE PASSAGES (QUALIFIED SERVICER ONLY) ......................................................................................................................................... 44
XX. Before Leaving an Installation ............................................................................................................................. 44
XXI. Repair &Replacement Parts ................................................................................................................................ 44
3
WARNING
If additional information or operating instructions are required, contact the dealer where the purchase was made.
If the information in these instructions is
not followed exactly, fire or explosion may
result causing property damage, personal
injury or loss of life.
TO THE INSTALLER
Before installing this unit, please read this manual thoroughly to familiarize yourself with specific items which must
be adhered to, including but not limited to: unit maximum
external static pressure, gas pressures, BTU input rating,
proper electrical connections, circulating air temperature
rise, minimum or maximum CFM, and motor speed connections.
– 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:
Keep this literature in a safe place for future
reference.
- Do not try to light any appliance.
- Do not touch any electrical switch; do
not use any phone in your building.
TRANSPORTATION DAMAGE
All units are securely packed in shipping containers tested
according to International Safe Transit Association specifications. The carton must be checked upon arrival for
external damage. If damage is found, a request for inspection by carrier’s agent must be made in writing immediately.
- 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.
The furnace must be carefully inspected on arrival for
damage and bolts or screws which may have come loose
in transit. In the event of damage the consignee should:
– Installation and service must be
performed by a qualified installer, service
agency or the gas supplier.
1. Make a notation on delivery receipt of any visible
damage to shipment or container.
2. Notify carrier promptly and request an inspection.
3. With concealed damage, carrier must be notified as
soon as possible - preferably within five days.
4. File the claim with the following support documents
within a nine month statute of limitations.
• Original or certified copy of the Bill of Lading, or
indemnity bond.
• Original paid freight bill or indemnity in lieu thereof.
• Original or certified copy of the invoice, showing trade
and other discounts or reductions.
• Copy of the inspection report issued by carrier’s
representative at the time damage is reported to
carrier.
WARNING
Should overheating occur or the gas supply
fail to shut off, turn off the manual gas shutoff valve external to the furnace before
turning off the electrical supply.
TO THE OWNER
It is important that you fill out the owner’s registration card
and mail it today. This will assist us in contacting you should
any service or warranty information change in the future.
When filling in the registration card, be sure to include the
model, manufacturing, and serial numbers, plus the installation date.
The carrier is responsible for making prompt inspection of
damage and for a thorough investigation of each claim. The
distributor or manufacturer will not accept claims from
dealers for transportation damage.
Your warranty certificate is also supplied with the unit. Read
the warranty carefully and note what is covered. Keep the
warranty certificate in a safe location for future reference.
ATTENTION INSTALLING PERSONNEL
As a professional installer you have an obligation to
know the product better than the customer. This
includes all safety precautions and related items.
Remember, it is your responsibility to install the
product safely and to know it well enough to be able
to instruct a customer in its safe use.
Prior to actual installation, thoroughly familiarize
yourself with this Instruction Manual. Pay special
attention to all safety warnings. Often during
installation or repair it is possible to place yourself
in a position which is more hazardous than when
the unit is in operation.
Safety is a matter of common sense...a matter of
thinking before acting. Most dealers have a list of
specific good safety practices...follow them.
The precautions listed in this Installation Manual
are intended as supplemental to existing practices.
However, if there is a direct conflict between existing
practices and the content of this manual, the
precautions listed here take precedence.
4
I. Component Identification
11
3
13
3
*
14
16
*
*
*
*
*
1
*
20
19
21
11
26
12
30
25
3
16
15
18
17
12
19
20
21
19
22
20
*
*
23
30
21
29
*
13
25
27
*
*
*
14
24
28
26
2 22
9
Upflow/Horizontal
(GUCA/GULA Models)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
10
28
15
24
17 18
3
23
19
33
31
20
21
32
32 33
31
27
34
4
2
5
9 10
7
8
7
6
4
Counterflow/Horizontal
(GCCA Models)
19
20
21
22
23
24
25
Gas Valve
Gas Line Entrance (Alternate)
Pressure Switch
Gas Manifold
Combustion Air Intake Connection / “Coupling”
Hot Surface Igniter
Rollout Limit
Burners
Flame Sensor
Flue Pipe Connection / “Coupling”
Flue Pipe (Internal)
Combustion Air Intake (Alternate)
Primary Limit
Gas Line Entrance
Flue Pipe Connection (Alternate)
Rubber Elbow
Induced Draft Blower
Electrical Connection Inlets (Alternate)
26
27
28
29
30
31
32
33
34
5
Coil Front Cover Pressure Tap
Coil Front Cover Drain Port
Drain Line Penetrations
Drain Trap
Blower Door Interlock Switch
Capacitor
Integrated Control Module
(with fuse and diagnostic LED)
24-Volt Thermostat Connections
Transformer (40 VA)
Circulator Blower
Bottom Return Filter Retainer
Auxiliary Limit
Junction Box
Electrical Connection Inlets
Coil Front Cover
Combustion Air Inlet Pipe
1
BLOWER COMPARTMENT
7
BURNER COMPARTMENT
8
7
*
BLOWER COMPARTMENT
6
*
BURNER COMPARTMENT
5
2. Firmly touch a clean, unpainted, metal surface of the
furnaces near the control. Any tools held in a person’s
hand during grounding will be discharged.
3. Service integrated control module or connecting wiring
following the discharge process in step 2. Use caution
not to recharge your body with static electricity; (i.e., do
not move or shuffle your feet, do not touch ungrounded
objects, etc.). If you come in contact with an ungrounded object, repeat step 2 before touching control
or wires.
4. Discharge your body to ground before removing a new
control from its container. Follow steps 1 through 3 if
installing the control on a furnace. Return any old or
new controls to their containers before touching any
ungrounded object.
II. Safety
Please adhere to the following warnings and cautions when
installing, adjusting, altering, servicing, or operating the
furnace.
WARNING
To prevent personal injury or death due to
improper installation, adjustment,
alteration, service or maintenance, refer to
this manual. For additional assistance or
information, consult a qualified installer,
service agency or the gas supplier.
III. Product Application
WARNING
This product contains or produces a
chemical or chemicals which may cause
serious illness or death and which are
known to the State of California to cause
cancer, birth defects or other reproductive
harm.
This furnace is primarily designed for residential homeheating applications. It is NOT designed or certified for use
in mobile homes, trailers or recreational vehicles. Neither
is it designed or certified for outdoor applications. The
furnace must be installed indoors (i.e., attic space, crawl
space, or garage area provided the garage area is enclosed
with an operating door).
This furnace can be used in the following non-industrial
commercial applications:
WARNING
To prevent possible death, personal injury
or property damage due to electrical shock,
the furnace must be located to protect the
electrical components from water.
Schools, Office buildings, Churches, Retail stores
Nursing homes, Hotels/motels, Common or office areas
In such applications , the furnace must be installed with the
following stipulations:
•
CAUTION
•
This unit must not be used as a
“construction heater” during the finishing
phases of construction on a new structure.
This type of use may result in premature
failure of the unit due to extremely low
return air temperatures and exposure to
corrosive or very dirty atmospheres.
•
•
•
•
ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS
NOTE: Discharge body’s static electricity before touching
unit. An electrostatic discharge can adversely affect electrical
components.
Use the following precautions during furnace installation
and servicing to protect the integrated control module from
damage. By putting the furnace, the control, and the person
at the same electrostatic potential, these steps will help
avoid exposing the integrated control module to electrostatic discharge. This procedure is applicable to both
installed and non-installed (ungrounded) furnaces.
It must be installed per the installation instructions
provided and per local and national codes.
It must be installed indoors in a building constructed
on site.
It must be part of a ducted system and not used in a
free air delivery application.
It must not be used as a “make-up” air unit.
It must be installed with two-pipe systems for combustion air, especially if VOC’s or other contaminants
are present in the conditioned space.
All other warranty exclusions and restrictions apply
This furnace is an CSA dual-certified appliance and
is appropriate for use with natural or propane gas
(NOTE: If using propane, a propane conversion kit
is required).
Dual certification means that the combustion air inlet pipe
is optional and the furnace can be vented as a:
Non-direct vent (single pipe) central forced air furnace in which combustion air is taken from the
installation area or from air ducted from the outside
or,
Direct vent (dual pipe) central forced air furnace in
which all combustion air supplied directly to the
furnace burners through a special air intake system
outlined in these instructions.
1. Disconnect all power to the furnace. Do not touch the
integrated control module or any wire connected to the
control prior to discharging your body’s electrostatic
charge to ground.
To ensure proper installation and operation, thoroughly
read this manual for specifics pertaining to the installation
and application of this product.
6
WARNING
IV. Location Requirements
and Considerations
Possible death, personal injury or property
damage due to fire, explosion, smoke, soot,
condensation, electrical shock or carbon
monoxide may result from improper
installation, repair, operation, or
maintenance of this product.
GENERAL
WARNING
To prevent possible death, personal injury,
equipment damage, or property damage
the following bullet points must be
observed when installing the unit.
WARNING
To prevent death, personal injury or
property damage due to fire, do not install
this furnace in a mobile home, trailer, or
recreational vehicle.
Follow the instructions listed below when selecting a furnace location. Refer also to the guidelines provided in
Section V, Combustion and Ventilation Air Requirements.
To ensure proper furnace operation, install, operate and
maintain the furnace in accordance with these installation
and operation instructions, all local building codes and
ordinances. In their absence, follow the latest edition of the
National Fuel Gas Code (NFPA 54/ANSI Z223.1), and/or
CAN/CSA B149 Installation Codes, local plumbing or waste
water codes, and other applicable codes.
•
•
•
A copy of the National Fuel Gas Code (NFPA 54/ANSI
Z223.1) can be obtained from any of the following:
American National Standards Institute
1430 Broadway
New York, NY 10018
National Fire Protection Association
•
1 Batterymarch Park
Quincy, MA 02269
CSA International
8501 East Pleasant Valley
•
Cleveland, OH 44131
A copy of the CAN/CSA B149 Installation Codes can also
be obtained from:
CSA International
178 Rexdale Boulevard
•
Etobicoke, Ontario, Canada M9W 1R3
The rated heating capacity of the furnace should be greater
than or equal to the total heat loss of the area to be heated.
The total heat loss should be calculated by an approved
method or in accordance with “ASHRAE Guide” or “Manual
J-Load Calculations” published by the Air Conditioning
Contractors of America.
•
7
Centrally locate the furnace with respect to the proposed or existing air distribution system.
Ensure the temperature of the return air entering the
furnace is between 55°F and 100°F when the furnace
is heating.
Provide provisions for venting combustion products
outdoors through a proper venting system. Special
consideration should be given to vent/flue pipe routing and combustion air intake pipe when applicable.
Refer to Section IX, Vent/Flue Pipe and Combustion
Air Pipe -Termination Locations for appropriate termination locations and to determine if the piping
system from furnace to termination can be accomplished within the guidelines given. NOTE: The
length of flue and/or combustion air piping can be a
limiting factor in the location of the furnace.
Locate the furnace so that the condensate can be
piped at a downward slope between furnace and
drain. Do not locate the furnace or its condensate
drainage system in any area subject to below freezing temperatures without proper freeze protection.
Refer to Section X, Condensate Drain Lines and Trap
for further details.
Set the furnace on a level floor to enable proper
condensate drainage. If the floor becomes wet or
damp at times, place the furnace above the floor on
a concrete base sized approximately 1-1/2" larger
than the base of the furnace. Refer to the Section VII,
Horizontal Applications and Considerations for leveling of horizontal furnaces.
Ensure upflow or horizontal furnaces are not installed
directly on carpeting, or any other combustible material. The only combustible material allowed is wood.
A special accessory subbase must be used for upright counterflow unit installations over any combustible material (including wood). Refer to subbase
instructions for installation details. (NOTE: A subbase will not be required if an air conditioning coil is
located beneath the furnace between the supply air
opening and the combustible floor.
•
•
•
•
•
Exposure to contaminated combustion air will result
in safety and performance-related problems. Do not
install the furnace where the combustion air is exposed to the following substances:
chlorinated waxes or cleaners
chlorine-based swimming pool chemicals
water softening chemicals
deicing salts or chemicals
carbon tetrachloride
halogen type refrigerants
cleaning solutions (such as perchloroethylene)
printing inks
paint removers
varnishes
hydrochloric acid
cements and glues
antistatic fabric softeners for clothes dryers
and masonry acid washing materials
Seal off a non-direct vent furnace if it is installed near
an area frequently contaminated by any of the above
substances. This protects the non-direct vent furnace from airborne contaminants. To ensure that the
enclosed non-direct vent furnace has an adequate
supply of combustion air, vent from a nearby uncontaminated room or from outdoors. Refer to the
Section V, Combustion and Ventilation Air Requirements for details.
If the furnace is used in connection with a cooling unit,
install the furnace upstream or in parallel with the
cooling unit. Premature heat exchanger failure will
result if the cooling unit is placed ahead of the
furnace.
If the furnace is installed in a residential garage,
position the furnace so that the burners and ignition
source are located not less than 18 inches (457 mm)
above the floor. Protect the furnace from physical
damage by vehicles.
If the furnace is installed horizontally, the furnace
access doors must be vertical so that the burners fire
horizontally into the heat exchanger. Do not install
the unit with the access doors on the “up/top” or
“down/bottom” side of the furnace.
TOP
TOP
SIDE
SIDE
SIDE
BOTTOM
BOTTOM
Upflow
Horizontal
Counterflow
A furnace installed in a confined space (i.e., a closet or utility
room) must have two ventilation openings with a total
minimum free area of 0.25 square inches per 1,000 BTU/
hr of furnace input rating. Refer to Specification Sheet for
minimum clearances to combustible surfaces. One of the
ventilation openings must be within 12 inches of the top; the
other opening must be within 12 inches of the bottom of the
confined space. In a typical construction, the clearance
between the door and door frame is usually adequate to
satisfy this ventilation requirement.
FURNACE SUSPENSION
If suspending the furnace from rafters or joist, use 3/8"
threaded rod and 2”x2”x1/8” angle iron as shown below.
The length of rod will depend on the application and the
clearances necessary.
PROVIDE 8" MINMUM CLEARANCE BETWEEN
CENTER ROD AND FURNACE CABINET
TO ALLOW FOR CIRCULATOR BLOWER REMOVAL
3/8" DIAMETER
ASSURE FURNACE IS LEVEL FROM
THREADED ROD
END TO END AND HAS A SLIGHT
(6 PLACES)
FORWARD TILT WITH THE FRONT
OF THE FURNACE 0"-3/4"
BELOW THE BACK OF THE FURNACE
HOLD DOWN
NUTS
SUPPORT
NUTS
2" X2"X1/8" ANGLE IRON
(3 PLACES)
POSITION AS CLOSE AS POSSIBLE
TO BLOWER DECK TO ALLOW FOR
TILT OUTWARD TO ALLOW FOR
DOOR AND CIRCULATOR BLOWER
CIRCULATOR BLOWER REMVOAL
REMOVAL
Suspended Furnace
EXISTING FURNACE REMOVAL
NOTE: When an existing furnace is removed from a venting
system serving other appliances, the venting system may
be too large to properly vent the remaining attached appliances.
CLEARANCES AND ACCESSIBILITY
Installations must adhere to the clearances to combustible
materials which this furnace has been design certified to.
The minimum clearance information for this furnace is
provided on the unit’s clearance label. These clearances
must be permanently maintained. Clearances must also
accommodate an installation’s gas, electrical, and drain
trap and drain line connections. If the alternate combustion
air intake or vent/flue connections are used additional
clearances must be provided to accommodate these connections. Refer to Section IX, Vent Flue Pipe and Combustion Air Pipe for details. NOTE: In addition to the required
clearances to combustible materials, a minimum of 36
inches service clearance must be available in front of the
unit.
8
The following vent testing procedure is reproduced from the
American National Standard/National Standard of Canada
for Gas-Fired Central Furnaces ANSI Z21.47-1998,
CSA-2.3-M98 Section 1.23.1.
The following steps shall be followed with each appliance connected to
the venting system placed in operation, while any other appliances
connected to the venting system are not in operation:
DRAFTS OR DEAD SPOTS
-BEHIND DOORS
-IN CORNERS
-UNDER CABINETS
a. Seal any unused openings in the venting system;
HOT
COLD
b. Inspect the venting system for proper size and horizontal pitch,
as required by the National Fuel Gas Code, ANSI Z223.1 or the
CSA B149 Installation Codes and these instructions. Determine
that there is no blockage or restriction, leakage, corrosion and
other deficiencies which could cause an unsafe condition;
Thermostat Influences
c. In so far as practical, close all building doors and windows and
all doors between the space in which the appliance(s) connected
to the venting system are located and other spaces of the
building. Turn on clothes dryers and any appliance not connected to the venting system. Turn on any exhaust fans, such as
range hoods and bathroom exhausts, so they shall operate at
maximum speed. Do not operate a summer exhaust fan. Close
fireplace dampers;
Consult the instructions packaged with the thermostat for
mounting instructions and further precautions.
V. Combustion & Ventilation
Air Requirements
d. Follow the lighting instructions. Place the appliance being
inspected in operation. Adjust thermostat so appliance shall
operate continuously;
WARNING
Possible death, personal injury or property
damage may occur if the furnace is not
provided with enough fresh air for proper
combustion and ventilation of flue gases.
Most homes require outside air to be
supplied to the furnace area.
e. Test for draft hood equipped spillage at the draft hood relief
opening after 5 minutes of main burner operation. Use the flame
of a match or candle;
f. After it has been determined that each appliance connected to
the venting system properly vents when tested as outlined
above, return doors, windows, exhaust fans, fireplace dampers
and any other gas burning appliance to their previous conditions
of use;
Improved construction and additional insulation in buildings
have reduced heat loss by reducing air filtration and escape
around doors and windows. These changes have helped
in reducing heating/cooling costs but have created a problem supplying combustion and ventilation air for gas fired
and other fuel burning appliances. Appliances that pull air
out of the house (clothes dryers, exhaust fans, fireplaces,
etc.) increase the problem by starving appliances for air.
g. If improper venting is observed during any of the above tests,
the common venting system must be corrected.
Corrections must be in accordance with the latest edition of
the National Fuel Gas Code NFPA 54/ANSI Z223.1 and/or
CSA B149 Installation Codes.
If resizing is required on any portion of the venting system,
use the appropriate table in Appendix G in the latest edition
of the National Fuel Gas Code ANSI Z223.1 and/or CSA B149
Installation Codes.
If this furnace is to be installed in the same space with other
gas appliances, such as a water heater, ensure there is an
adequate supply of combustion and ventilation air for the
other appliances. Refer to the latest edition of the National
Fuel Gas Code NFPA 54/ANSI Z223.1 (Section 5.3), or
CSA B149 Installation Codes (Sections 7.2, 7.3, or 7.4), or
applicable provisions of the local building codes for determining the combustion air requirements for the appliances.
THERMOSTAT LOCATION
In an area having good air circulation, locate the thermostat
about five feet high on a vibration-free inside wall. Do not
install the thermostat where it may be influenced by any of
the following:
Most homes will require outside air be supplied to the
furnace area by means of ventilation grilles or ducts connecting directly to the outdoors or spaces open to the
outdoors such as attics or crawl spaces.
• Drafts, or dead spots behind doors, in corners, or
•
•
•
•
•
•
under cabinets.
Hot or cold air from registers.
Radiant heat from the sun.
Light fixtures or other appliances.
Radiant heat from a fireplace.
Concealed hot or cold water pipes, or chimneys.
Unconditioned areas behind the thermostat, such
as an outside wall.
9
The following information on air for combustion and ventilation
is reproduced from the National Fuel Gas Code
NFPA 54/ANSI Z223.1 Section 5.3.
5.3.3 Equipment Located in Confined Spaces:
(a) All Air from Inside the Building: The confined space shall be
provided with two permanent openings communicating directly
with an additional room(s) of sufficient volume so that the
combined volume of all spaces meets the criteria for an unconfined space. The total input of all gas utilization equipment
installed in the combined space shall be considered in making
this determination. Each opening shall have a minimum free
area of 1 square inch per 1,000 BTU per hour of the total input
rating of all gas utilization equipment in the confined space, but
not less than 100 square inches. One opening shall be within 12
inches of the top and one within 12 inches of the bottom of the
enclosure.
5.3.1 General:
(a) The provisions of 5.3 apply to gas utilization equipment installed in buildings and which require air for combustion,
ventilation and dilution of flue gases from within the building.
They do not apply to (1) direct vent equipment which is
constructed and installed so that all air combustion is obtained
from the outside atmosphere and all flue gases are discharged to
the outside atmosphere, or (2) enclosed furnaces which incorporate an integral total enclosure and use only outside air for
combustion and dilution of flue gases.
Chimney or Gas Vent
(b) Equipment shall be installed in a location in which the facilities
for ventilation permit satisfactory combustion of gas, proper
venting and the maintenance of ambient temperature at safe
limits under normal conditions of use. Equipment shall be
located so as not to interfere with proper circulation of air. When
normal infiltration does not provide the necessary air, outside
air shall be introduced.
NOTE: Each opening must have
a free area of not less than one
square inch per 1000 BTU of
the total input rating of all equipment in the enclosure, but not
less than 100 square inches.
Opening
(c) In addition to air needed for combustion, process air shall be
provided as required for: cooling of equipment or material,
controlling dew point, heating, drying, oxidation or dilution,
safety exhaust, odor control, and air for compressors.
Furnace
Water
Heater
Opening
(d) In addition to air needed for combustion, air shall be supplied for
ventilation, including all air required for comfort and proper
working conditions for personnel.
(e) While all forms of building construction cannot be covered in
detail, air for combustion, ventilation and dilution of flue gases
for gas utilization equipment vented by natural draft normally
may be obtained by application of one of the methods covered
in 5.3.3 and 5.3.4.
Equipment Located in Confined Spaces; All
Air from Inside Building. See 5.3.3-a.
(b) All Air from Outdoors: The confined space shall be provided
with two permanent openings, one commencing within 12
inches of the top and one commencing within 12 inches of the
bottom of the enclosure. The openings shall communicate
directly, or by ducts, with the outdoors or spaces (crawl or attic)
that freely communicate with the outdoors.
(f) Air requirements for the operation of exhaust fans, kitchen
ventilation systems, clothes dryers, and fireplaces shall be
considered in determining the adequacy of a space to provide
combustion air requirements.
5.3.2 Equipment Located in Unconfined Spaces:
In unconfined spaces (see definition below) in buildings, infiltration
may be adequate to provide air for combustion ventilation and
dilution of flue gases. However, in buildings of tight construction
(for example, weather stripping, heavily insulated, caulked, vapor
barrier, etc.), additional air may need to be provided using the
methods described in 5.3.3-b or 5.3.4.
Space, Unconfined.
For purposes of this Code, a space whose volume is not less than 50
cubic feet per 1,000 BTU per hour of the aggregate input rating of
all appliances installed in that space. Rooms communicating directly with the space in which the appliances are installed through
openings not furnished with doors, are considered a part of the
unconfined space.
1. When directly communicating with the outdoors, each
opening shall have a minimum free area of 1 square inch per
4,000 BTU per hour of total input rating of all equipment in
the enclosure.
Chimney or Gas Vent
Ventilation louvers
(each end of attic)
NOTE: The inlet and outlet air
openings must each have a free
area of not less than one square
inch per 4000 BTU of the
total input rating of all equipment
in the enclosure.
Outlet Air
Furnace
Water
Heater
Inlet Air
Alternate
air inlet
Ventilation louvers for
unheated crawl space
Equipment Located in Confined Spaces; All
Air from Outdoors—Inlet Air from Ventilated
Crawl Space and Outlet Air to Ventilated
Attic. See 5.3.3-b
10
2. When communicating with the outdoors through vertical
ducts, each opening shall have a minimum free area of 1
square inch per 4,000 BTU per hour of total input rating of
all equipment in the enclosure.
4. When ducts are used, they shall be of the same crosssectional area as the free area of the openings to which they
connect. The minimum dimension of rectangular air ducts
shall not be less than 3 inches.
Chimney or Gas Vent
NOTE: The single opening must have
a free area of not less than one
square inch per 3000 BTU of
the total input rating of all equipment in the enclosure, but not less than
the sum of the areas of all vent
connectors in the confined space.
Ventilation louvers
(each end of attic)
NOTE: The inlet and outlet air
openings must each have a free
area of not less than one square
inch per 4000 BTU of the
total input rating of all equipment
in the enclosure.
Chimney or Gas Vent
Opening
Outlet Air
Furnace
Water
Heater
Furnace
Inlet air duct
[ends 1 ft (300 mm)
above floor]
Water
Heater
Alternate
Opening
Location
Equipment Located in Confined Spaces; All
Air from Outdoors Through Ventilated Attic.
See 5.3.3-b.
Equipment Located in Confined Spaces; All
Air from Outdoors - Single Air Opening. See
5.3.3-b.
3. When communicating with the outdoors through horizontal
ducts, each opening shall have a minimum free area of 1
square inch per 2,000 BTU per hour of total input rating of
all equipment in the enclosure.
5. When directly communicating with the outdoors, the single
opening shall have a minimum free area of 1 square inch per
3,000 BTU per hour of total input rating of all equipment in
the enclosure
5.3.4 Specially Engineered Installations:
Chimney or Gas Vent
Outlet air duct
Furnace
The requirements of 5.3.3 shall not necessarily govern when special
engineering, approved by the authority having jurisdiction, provides an adequate supply of air for combustion, ventilation, and
dilution of flue gases.
NOTE: The air duct openings
must have a free area of not
less than one square inch per
2000 BTU of the total input
rating of all equipment in the
enclosure*.
5.3.5 Louvers and Grilles:
In calculating free area in 5.3.3, consideration shall be given to the
blocking effect of louvers, grilles or screens protecting openings.
Screens used shall not be smaller than 1/4 inch mesh. If the area
through a design of louver or grille is known, it should be used in
calculating the size of opening required to provide the free area
specified. If the design and free area is not known, it may be
assumed that wood louvers will have 20-25 percent free area and
metal louvers and grilles will have 60-75 percent free area. Louvers
and grilles shall be fixed in the open position or interlocked with the
equipment so that they are opened automatically during equipment
operation.
Water
Heater
Inlet air duct
*If the appliance room is located against an outside wall and the air openings communicate
directly with the outdoors, each opening shall have a free area of not less than one square inch
per 4,000 BTU per hour of the total input rating of all appliances in the enclosure.
5.3.6 Special Conditions Created by Mechanical Exhausting or
Fireplaces:
Equipment Located in Confined Spaces; All
Air from Outdoors. See 5.3.3-b.
Operation of exhaust fans, ventilation systems, clothes dryers, or
fireplaces may create conditions requiring special attention to avoid
unsatisfactory operation of installed gas utilization equipment. Air
from Inside Building. See 5.3.3-a.
11
VI. Installation Positions
LEVELING
Leveling ensures proper condensate drainage from the
heat exchanger and induced draft blower. For proper flue
pipe drainage, the furnace must be level lengthwise from
end to end. The furnace should also be level from back to
front or have a slight tilt with the access doors downhill
(approximately 3/4 inches) from the back panel. The slight
tilt allows the heat exchanger condensate, generated in the
recuperator coil, to flow forward to the recuperator coil front
cover.
This furnace may be installed in an upright position or
horizontal on either the left or right side panel. Do not install
this furnace on its back. For upright upflow furnaces, return
air ductwork may be attached to the side panel(s) and/or
basepan. For horizontal upflow furnaces, return air ductwork must be attached to the basepan. For both upright or
horizontal counterflow furnaces, return ductwork must be
attached to the basepan (top end of the blower compartment). NOTE: Ductwork must never be attached to the
back of the furnace. Refer to the product Specifications
Sheet for proper airflow requirements and number of required ductwork connections. Refer to “Recommended
Installation Positions” figure for appropriate installation
positions, ductwork connections, and resulting airflow arrangements.
ALTERNATE VENT/FLUE AND COMBUSTION AIR
CONNECTIONS
In horizontal installations provisions for alternate flue and
combustion air piping are available for upflow furnaces with
left discharge and counterflow furnaces with right air discharge. In these positions the flue and combustion air
piping can be run vertically through the side of the furnace.
Refer to the “Recommended Installation Positions” figure
for further detail. The standard piping connections may
also be used in these positions. Refer to Section IX, Vent/
Flue Pipe and Combustion Air Pipe for details concerning
the conversion to the alternate vent/flue and combustion air
connections.
VII. Horizontal Applications
& Considerations
GENERAL
Horizontal applications, in particular, may dictate many of
the installation’s specifics such as airflow direction, ductwork connections, flue and combustion air pipe connections, etc. The basic application of this furnace as a
horizontal furnace differs only slightly from an upright
installation. When installing a furnace horizontally, additional consideration must be given to the following:
AIR
DISCHARGE
Side
Return
Duct
Connection
FROM END TO END
AND COMBUSTION AIR
FURNACE MUST BE LEVEL
INTAKE LOCATIONS
OR SLIGHTLY TILTED FORWARD
Bottom
Return
Duct
Connection
AIR
DISCHARGE
UPFLOW
UPRIGHT
WITH THE DOORS 0" - 3/4"
BELOW THE BACK PANEL
COUNTERFLOW
UPRIGHT
ALTERNATE FLUE AND
COMBUSTION AIR PIPE
LOCATIONS
4 3/4" MINIMUM
DRAIN TRAP
CLEARANCE
GAS LINE WITH
AIR
DISCHARGE
DRIP LEG (3" MINIMUM)
ALTERNATE FLUE AND
COMBUSTION AIR PIPE
LOCATIONS
Side
Return
Duct
Connection
Bottom
Return
Duct
Connection
FURNACE MUST BE LEVEL
ALTERNATE VENT/FLUE
ALTERNATE FLUE AND
COMBUSTION AIR PIPE
LOCATIONS
Bottom
Return
Duct
Connection
UPFLOW HORIZONTAL
LEFT AIR DISCHARGE
ALTERNATE FLUE AND
COMBUSTION AIR PIPE
LOCATIONS
Bottom
Return
Duct
Connection
AIR
DISCHARGE
COUNTERFLOW HORIZONTAL
RIGHT AIR DISCHARGE
DRAIN LINE WITH 1/4" PER FOOT
DRAIN PAN
DOWNWARD SLOPE
FURNACE MUST BE SUPPORTED
36" MINIMUM SERVICE
AT BOTH ENDS AND MIDDLE
CLEARANCE REQUIRED
Bottom
Return
Duct
Connection
Horizontal Furnace
AIR
DISCHARGE
UPFLOW HORIZONTAL
RIGHT AIR DISCHARGE
DRAIN TRAP AND LINES
In horizontal applications the condensate drain trap is
secured to the furnace side panel, suspending it below the
furnace. A minimum clearance of 4 3/4 inches below the
furnace must be provided for the drain trap. Additionally,
the appropriate downward piping slope must be maintained
from the drain trap to the drain location. Refer to Section X,
Condensate Drain Trap and Lines for further details. If the
drain trap and drain line will be exposed to temperatures
near or below freezing, adequate measures must be taken
to prevent condensate from freezing.
AIR
DISCHARGE
Bottom
Return
Duct
Connection
COUNTERFLOW HORIZONTAL
LEFT AIR DISCHARGE
Recommended Installation Positions
NOTE: Alternate “vertical” piping connections can not be
used when an upflow furnace is installed with supply air
discharging to the right, or when a counterflow furnace is
installed with supply air discharging to the left. In either case,
use the standard flue and combustion air piping connections.
12
IX. Vent/Flue Pipe
& Combustion Air Pipe
ALTERNATE ELECTRICAL AND GAS LINE
CONNECTIONS
This furnace has provisions allowing for electrical and gas
line connections through either side panel. In horizontal
applications the connections can be made either through
the “top” or “bottom” of the furnace.
GENERAL
WARNING
DRAIN PAN
A drain pan must be provided if the furnace is installed
above a conditioned area. The drain pan must cover the
entire area under the furnace (and air conditioning coil if
applicable).
Failure to follow these instructions can
result in bodily injury or death. Carefully
read and follow all instructions given in
this section.
WARNING
FREEZE PROTECTION
Refer to Section VI, Horizontal Applications and Conditions
- Drain Trap and Lines.
Upon completion of the furnace installation,
carefully inspect the entire flue system
both inside and outside the furnace to
assure it is properly sealed. Leaks in the
flue system can result in serious personal
injury or death due to exposure to flue
products, including carbon monoxide.
FURNACE SUSPENSION
If the furnace is installed in a crawl space it must be
suspended from the floor joist or supported by a concrete
pad. Never install the furnace on the ground or allow it to
be exposed to water. Refer to Section IV, Location Requirements and Considerations - Furnace Suspension for further details.
A condensing gas furnace achieves its high level of efficiency by extracting almost all of the heat from the products
of combustion and cooling them to the point where condensation takes place. Because of the relatively low flue gas
temperature and water condensation requirements, PVC
pipe is used as venting material.
VIII. Propane Gas and/or
High Altitude Installations
WARNING
This furnace must not be connected to Type B, BW, or L
vent or vent connector, and must not be vented into any
portion of a factory built or masonry chimney except when
used as a pathway for PVC as described later in this
section. Never common vent this appliance with another
appliance or use a vent which is used by a solid fuel
appliance. Do not use commercially available “no hub
connectors” other than those shipped with this product.
Possible death, personal injury or property
damage may occur if the correct conversion
kits are not installed. The appropriate kits
must be applied to insure safe and proper
furnace operation. All conversions must
be performed by a qualified installer or
service agency.
It is the responsibility of the installer to follow the manufacturers’ recommendations and to verify that all vent/flue
piping and connectors are compatible with furnace flue
products. Additionally, it is the responsibility of the installer
to ensure that all piping and connections possess adequate
structural integrity and support to prevent flue pipe separation, shifting, or sagging during furnace operation.
This furnace is shipped from the factory configured for
natural gas at standard altitude. Propane gas installations
require an orifice change to compensate for the energy
content difference between natural and propane gas.
High altitude installations may require both a pressure
switch and an orifice change. These changes are necessary to compensate for the natural reduction in the density
of both the gas fuel and the combustion air at higher
altitude.
DUAL CERTIFICATION: NON-DIRECT/DIRECT VENT
This furnace is dual certified and may be installed as a nondirect vent (single pipe) or direct vent (dual pipe) appliance.
A non-direct vent installation requires only a vent/flue pipe,
while a direct vent installation requires both a vent/flue pipe
and a combustion air intake pipe. Refer to the appropriate
section for details concerning piping size, length, number of
elbows, furnace connections, and terminations.
Refer to the product Specification Sheet or contact an
distributor for a tabular listing of appropriate manufacturer’s
kits for propane gas and/or high altitude installations. The
indicated kits must be used to insure safe and proper
furnace operation. All conversions must be performed by
a qualified installer, or service agency.
13
Precautions should be taken to prevent condensate from
freezing inside the vent/flue pipe and/or at the vent/flue pipe
termination. All vent/flue piping exposed to freezing temperatures below 35°F for extended periods of time must be
insulated with 1/2” thick closed cell foam. Also all vent/flue
piping exposed outdoors in excess of the terminations
shown in this manual (or in unheated areas) must be
insulated with 1/2” thick closed cell foam. Inspect piping for
leaks prior to installing insulation.
MATERIALS AND JOINING METHODS
WARNING
To avoid fire, explosion, or bodily injury,
solvent cements must be kept away from
all ignition sources (i.e., sparks, open
flames, and excessive heat) as they are
combustible liquids. Avoid breathing
cement vapors or contact with skin and/or
eyes.
TERMINATION LOCATIONS
NOTES: Refer to Section IV, Location Requirements and
Considerations for combustion air contaminant restrictions.
Two- or three-inch nominal diameter PVC Schedule 40
pipe meeting ASTM D1785, PVC primer meeting ASTM
F656, and PVC solvent cement meeting ASTM D2564
specifications must be used. Fittings must be DWV type
fittings meeting ASTM D2665 and ASTM D3311. Carefully
follow the manufacturer’s instructions for cutting, cleaning,
and solvent cementing of PVC.
The following bullets and diagram describe the restrictions
concerning the appropriate location of vent/flue pipe and
combustion air intake pipe (when applicable) terminations.
Refer to Non-Direct Vent (Single Pipe) Piping and Direct
Vent (Dual Pipe) Piping located in this section for specific
details on termination construction.
As an alternative to PVC pipe, primer, solvent cement, and
fittings, ABS materials which are in compliance with the
following specifications may be used. Two-or-three-inch
ABS Schedule 40 pipe must meet ASTM D1527 and, if
used in Canada, must be CSA listed. Solvent cement for
ABS to ABS joints must meet ASTM D2235 and, if used in
Canada, must be CSA listed. The solvent cement for the
PVC to ABS transition joint must meet ASTM D3138.
Fittings must be DWV type fittings meeting ASTM D2661
and ASTM D3311 and, if used in Canada, must be CSA
listed. Carefully follow the manufacturers’ instructions for
cutting, cleaning, and solvent cementing PVC and/or ABS.
• All terminations (flue and/or intake) must be located at
•
least 12 inches above ground level or the anticipated
snow level.
Vent terminations (non-direct and direct vent) must
terminate at least 3 feet above any forced air inlet
located within 10 feet.
NOTE: This provision does not apply to the combustion
air intake termination of a direct vent application.
• The vent termination of a non-direct vent application
All 90° elbows must be medium radius (1/4 bend DWV) or
long radius (Long sweep 1/4 bend DWV) types conforming
to ASTM D3311. A medium radius (1/4 bend DWV) elbow
measures 3 1/16” minimum from the plane of one opening
to the centerline of the other opening for 2” diameter pipe,
and 4 9/16” minimum for 3” pipe.
•
•
PROPER VENT/FLUE AND COMBUSTION AIR PIPING
PRACTICES
Adhere to these instructions to ensure safe and proper
furnace performance. The length, diameter, and number of
elbows of the vent/flue pipe and combustion air pipe (when
applicable) affects the performance of the furnace and
must be carefully sized. All piping must be installed in
accordance with local codes and these instructions.
•
Piping must be adequately secured and supported to
prohibit sagging, joint separation, and/or detachment from
the furnace. Horizontal runs of vent/flue piping must be
supported every three feet and must maintain a 1/4 inch per
foot downward slope, back towards the furnace, to properly
return condensate to the furnace’s drain system. Allowances should be made for minor expansion and contraction
due to temperature variations. For this reason, particular
care must be taken to secure piping when a long run is
followed by a short offset of less than 40 inches.
•
14
must terminate at least 4 feet below, 4 feet horizontally
from, or 1 foot above any door, window, or gravity air
inlet into any building.
The vent termination of a direct vent application must
terminate at least 12 inches from any opening through
which flue gases may enter a building (door, window, or
gravity air inlet).
The vent termination of vent pipe run vertically through
a roof must terminate at least 12 inches above the roof
line (or the anticipated snow level) and be at least 12
inches from any vertical wall (including any anticipated
snow build up).
A vent termination shall not terminate over public walkways or over an area where condensate or vapor could
create a nuisance or hazard or could be detrimental to
the operation of regulators, relief valves, or other equipment.
The combustion air intake termination of a direct vent
application should not terminate in an area which is
frequently dusty or dirty.
provided with this furnace (see “Standard Connections”
figure). The rubber coupling allows separation of the vent/
flue pipe from the furnace during servicing. NOTE: Do not
use other commercially available “no hub connectors” due
to possible material conflicts. The vent/flue pipe can also
be secured using a PVC or ABS elbow or coupling using the
appropriate glue (see Section IX, Materials and Joining
Methods.
NOTE: In Canada, the Canadian Fuel Gas Code takes
precedence over the preceding termination restrictions.
Non-Direct Vent
&
Direct Vent
Vent/Flue Terminations
Non-Direct Vent
Vent/Flue Termination
NOTE: For non-direct vent installations, a minimum of one
90° elbow must be installed on the combustion air intake
coupling to guard against inadvertent blockage.
No Terminations
Above Walkway
<10'
3' min.
Grade or Highest
Anticipated
Snow Level
Forced Air
Inlet
4' min.
12"
Combustion Air Pipe
4'
min.
Direct Vent Installations
On upflow units secure the combustion air intake pipe
directly to the air intake coupling. On counterflow units
secure the combustion air intake pipe to the air intake
coupling using the rubber coupling and worm gear hose
clamps provided with the unit. The counterflow rubber
coupling allows service removal of air intake piping internal
to the furnace blower compartment. NOTE: Because of
probable material conflicts, do not use other commercially
available “no hub connectors”. The combustion air intake
pipe can also be secured directly to the counterflow unit air
intake pipe coupling.
12"
min.
12" min.
12" min.
Non-Direct Vent
Vent/Flue Termination
Direct Vent
Vent/Flue Termination
Vent Termination Clearances
CANADIAN VENTING REQUIREMENTS
In Canada, venting must conform to the requirements of the
current CAN/CSA-B149 Installation Code. Use only CSA
listed two or three inch diameter PVC or ABS pipe, solvent
cement, and fittings throughout. Carefully follow the manufacturers’ instructions for cutting, cleaning, and solvent
cementing PVC and/or ABS.
Non-Direct Vent Installations
A minimum of one 90° elbow must be installed on the
combustion air intake “coupling” to guard against inadvertent blockage.
The vent can be run through an existing unused chimney
provided the space between the vent pipe and the chimney
is insulated and closed with a weather-tight,
corrosion-resistant flashing.
COMBUSTION
AIR PIPE
(DIRECT VENT ONLY)
90 PVC
ELBOW
(NON-DIRECT VENT)
The vent shall not be located:
•
•
•
RUBBER
COUPLING
WITH WORM
GEAR CLAMPS
gas service regulator. For gas service regulators in the
Province of Ontario, 72 inches.
Less than 72 inches from the combustion air intake of
another appliance.
Directly above a gas utility meter or service regulator.
Over a walkway unless located 84 inches above grade.
90 PVC
ELBOW
(NON-DIRECT VENT)
VENT/FLUE
PIPE
RUBBER
COUPLINGS
WITH WORM
GEAR CLAMPS
OR
OR
• Less than 12 inches above the finished grade line.
• Less than 36 inches from any building opening or any
COMBUSTION
AIR PIPE
(DIRECT VENT ONLY)
VENT/FLUE
PIPE
UPFLOW
COUNTERFLOW
STANDARD CONNECTIONS
STANDARD FURNACE CONNECTIONS
It is the responsibility of the installer to ensure that the piping
connections to the furnace are secure, airtight, and adequately supported.
ALTERNATE FURNACE CONNECTIONS
If the standard locations are undesirable for a specific
installation, alternate side panel locations are available for
both combustion air inlet and vent/flue pipe connections.
These locations may be of particular benefit to upright
upflow installations requiring additional access to an A coil,
or to upright counterflow installations requiring additional
access to a filter or electronic air cleaner, or to horizontal
installations desiring vent/flue (and combustion air intake)
piping run vertically from the side of the cabinet.
As shipped, attachment “couplings” for vent/flue and combustion air intake pipe connections are provided on the
furnace’s top cover (upflow) or basepan (counterflow). To
use the standard connections, field supplied vent/flue pipe
and combustion air intake pipe (when applicable) should be
secured directly to the furnace at these locations.
Vent/Flue Pipe
Vent/flue pipe can be secured to the vent/flue coupling
using the rubber coupling and worm gear hose clamps
15
5. Remove plastic plug from alternate vent/flue location.
Relocate and install plug in standard vent/flue location
(top cover).
Counterflow units.
Remove plastic plug from alternate vent/flue location.
Relocate and install plug in standard vent/flue location
(basepan). Plug remaining hole in blower deck with
plastic plug included in the drain kit bag.
6. Upflow and Counterflow units.
Insert cut section of vent/flue pipe and coupling into
alternate vent/flue location. Using a rubber coupling
and worm gear hose clamps from the drain kit bag,
attach the vent/flue pipe and coupling to the induced
draft blower. Secure the coupling to the cabinet using
the screws removed in step 1 or with field-supplied 3/8”
#8 self drilling screws.
NOTE: Standard and alternate locations can be combined
(i.e., an installation may use the standard combustion air
intake location but use the alternate vent/flue location or
vice versa), if needed.
CAUTION
Edges of sheet metal holes may be sharp.
Use gloves as a precaution when removing
hole plugs.
Alternate Vent/Flue Location
The alternate vent/flue location is the large hole directly in
line with the induced draft blower outlet. To use the
alternate vent/flue location refer to the following steps, the
“Vent/Flue Pipe Cuts” figure, and the “Alternate Vent/Flue
Location” figure.
WARNING
NOTE: Counterflow instructions follow the upflow instructions.
The rubber elbow is not designed to support
a load. When the rubber elbow is mounted
externally to the furnace cabinet, extreme
care must be taken to adequately support
field-supplied vent/flue piping. As damage
can result in leaks causing bodily injury or
death due to exposure to flue gases,
including carbon monoxide.
1. Remove and save the four screws securing the vent/
flue coupling to the furnace top panel.
Counterflow units.
Remove and save the four screws securing the vent/
flue coupling to the furnace basepan. Also remove the
three screws securing the furnace’s internal vent/flue
piping to the blower deck.
2. Upflow and Counterflow units.
Loosen the worm gear hose clamps on the rubber
elbow and detach it from both the induced draft blower
and the vent/flue pipe.
3. Upflow and Counterflow units.
Remove the vent/flue pipe from the furnace.
4. Cut the vent/ flue pipe at the elbow nearest the coupling
end of the pipe (see “ Vent/Flue Pipe Cuts” figure). The
section of pipe attached to the coupling will reach
through the side panel to the induced draft blower.
Discard unused pipe and elbows.
Counterflow units.
Cut the vent/flue pipe 3.718 inches from the blower
deck coupling (see “Vent/Flue Pipe Cuts” figure). Save
vent/flue pipe attached to blower deck coupling for use
in the alternate location. Discard remaining pipe and
elbows.
7. Upflow and Counterflow units.
For upright installations, externally mount the rubber
elbow to the vent/flue coupling using a worm gear hose
clamp. Secure field supplied vent/flue piping to the
rubber elbow using a worm gear hose clamp. NOTE:
Use of the alternate vent/flue location for upright installations, requires the drain trap be installed on the same
side of the unit as the flue pipe.
8. Upflow and Counterflow units.
For horizontal installations, externally secure the
field-supplied vent/flue pipe directly to the vent/flue
coupling using a PVC or ABS coupling or elbow.
COUPLING
4
CUT AT ELBOW
NEAREST COUPLING
ELBOWS
UPFLOW
Vent/Flue Pipe Cuts
16
3
REMOVE
PIPE
1.
REMOVE
4 SCREWS
1
REMOVE
4 SCREWS
3
REMOVE
PIPE
3. Remove plastic plug from alternate combustion air
intake location. Relocate and install plug in standard air
intake location (top cover).
Counterflow units.
Remove plastic plug from alternate combustion air
intake location. Relocate and install plug in standard air
intake location (basepan). Plug the remaining hole in
the blower deck with the plastic plug included in the
drain kit bag.
4. Upflow and Counterflow units.
With the gasket facing the cabinet side panel, and the
flange’s flat spot facing forward, secure the combustion
air intake coupling to the cabinet using the screws
removed in step 1 or with field-supplied 3/8” #8 self drilling screws.
1
REMOVE
3 SCREWS
*
*
5
REMOVE
AND RELOCATE
S N
I GL E
UPFLOW
O N
2
C
3
P
O
F
F
1
M
*
*
TW O
2
DETACH RUBBER
ELBOW FROM
ID BLOWER AND
VENT/FLUE
PIPE
*
*
CU T FO R
DE H UM
S3
1
O FF
*
*
OF F
Intell- Ignition
WR
3
2
S1
*
3
4 21
6
3
TS A
T T
*
3
4 21
8 7
1
2
9
5
2
*
*
8 7
ON
1
8
U S
*
*
*
*
C F M
S4
0
1
7
4
1
ON
C
5
REMOVE
AND RELOCATE
2
DETATCH RUBBER
ELBOW FROM
ID BLOWER AND
VENT/FLUE
PIPE
COUNTERFLOW
5
ADDITIONAL PLUG
FROM DRAIN KIT
7
EXTERNALLY
MOUNT
RUBBER ELBOW
*
*
*
2
C
ON
O
F
P
1
F
M
*
*
3
CAUTION
Be sure not to damage internal wiring or
other components, when reinstalling
coupling and screws.
6
SECURE TO
ID BLOWER WITH
RUBBER COUPLING
AND HOSE
CLAMPS
*
*
COUNTERFLOW/UPRIGHT
(UPFLOW SIMILAR)
5. Upflow and Counterflow units.
For non-direct vent installations installed horizontally, a minimum of one 90° elbow must be installed on
the combustion air intake coupling to guard against
inadvertent blockage. No elbow is required on the
alternate combustion air intake of upright installations,
however, a minimum clearance of 2 inches is required
to assure proper air supply.
6. Upflow and Counterflow units.
For direct vent installations, secure field-supplied
combustion air intake pipe directly to the air intake
coupling.
NOTE: A PVC coupling or elbow is required on
counterflow units.
*
*
3
P
2
C
O N
O
F
F
*
*
*
*
1
M
UPFLOW/HORIZONTAL
(COUNTERFLOW SIMILAR)
Alternate Vent/Flue Location
Alternate Combustion Air Intake Location
The alternate combustion air intake location is the large
hole not in line with the induced draft blower outlet. To use
the alternate combustion air intake location, refer to the
following steps, and the “Alternate Combustion Air Intake
Location” figure.
1
REMOVE
4 SCREWS
*
*
6
SECURE TO
CABINET WITH
SCREWS
2
REMOVE
*
6
SECURE TO
ID BLOWER WITH
RUBBER COUPLING
AND HOSE
CLAMPS
*
*
*
*
*
*
1. Remove and save the four screws securing the combustion air intake coupling to the furnace’s top panel
(upflow).
Counterflow units.
Remove and save the four screws securing the combustion air intake coupling to the basepan. Remove an
additional three screws securing the furnace’s internal
combustion air intake pipe to the blower deck.
2. Remove the combustion air intake coupling and gasket
from the top panel.
Counterflow units.
Remove the combustion air intake pipe from the furnace and cut the pipe at the basepan coupling. Save
the basepan coupling and gasket from the blower deck
coupling for use in the alternate location. Discard the
remaining pipe.
*
NOTE: Counterflow unit instructions follow the upflow
instructions.
2
REMOVE
AND CUT
1
3
REMOVE
REMOVE 3 SCREWS
AND
3
RELOCATE
ADDITIONAL
PLUG FROM
DRAIN KIT
5
2" CLEARANCE
REQUIRED
(NON-DIRECT
VENT)
1
REMOVE
4 SCREWS
*
*
*
*
*
*
*
UPFLOW
*
*
3.
REMOVE
AND
RELOCATE
COUNTERFLOW
5
4
SECURE
TO CABINET
*
*
*
*
*
*
*
*
*
UPFLOW/HORIZONTAL SHOWN
(COUNTERFLOW SIMILAR)
Alternate Combustion Air Intake Location
17
NON-DIRECT VENT (SINGLE PIPE) PIPING
Non-direct vent installations require only a vent/flue pipe.
The vent pipe can be run horizontally with an exit through
the side of the building or run vertically with an exit through
the roof of the building. The vent can also be run through
an existing unused chimney; however, it must extend a
minimum of 12 inches above the top of the chimney. The
space between the vent pipe and the chimney must be
closed with a weather-tight, corrosion-resistant flashing.
For details concerning connection of the vent/flue pipe to
the furnace, refer to Section IX, Vent/Flue Pipe and Combustion Air - Standard Furnace Connections or Alternate
Furnace Connections for specific details. Refer to the
following Non-Direct Vent (Single Pipe) Piping - Vent/Flue
Pipe Terminations for specific details on termination construction.
TEE
12 " Min To
Roof Or
Highest Anticipated
Snow Level
Vertical Termination (Single Pipe)
Although non-direct vent installations do not require a
combustion air intake pipe, a minimum of one 90° elbow
must be attached to the furnace’s combustion air intake if:
an upright installation uses the standard intake location, or
a horizontal installation uses the alternate air intake location. This elbow will guard against inadvertent blockage of
the air intake.
90º
Medium Radius
Elbow
Vent/Flue Pipe Lengths and Diameters
Refer to the following table for applicable length, elbows,
and pipe diameter for construction of the vent/flue pipe
system of a non-direct vent installation. In addition to the
vent/flue pipe, a single 90° elbow must be secured to the
combustion air intake to prevent inadvertent blockage. The
tee used in the vent/flue termination must be included when
determining the number of elbows in the piping system.
12" Min.
Alternate Vertical Termination (Single Pipe)
Horizontal vent/flue pipe terminations should be as shown
in the following figure. Refer to Section IX, Vent/Flue Pipe
and Combustion Air Pipe - Termination Locations for details
concerning location restrictions. A 2 3/8” diameter wall
penetration is required for 2” diameter pipe while a 3 1/2”
diameter hole is required for 3” diameter pipe. To secure
the pipe passing through the wall and prohibit damage to
piping connections, a coupling should be installed on either
side of the wall and solvent cemented to a length of pipe
connecting the two couplings. The length of pipe should be
the wall thickness plus the depth of the socket fittings to be
installed on the inside and outside of the wall. The wall
penetration should be sealed with silicone caulking material.
Non-Direct Vent (Single Pipe)
Maximum Allowable Length of Vent/Flue Pipe (ft) (1) (2)
Unit Input
(BTU)
Pipe
Size (4)
(inc.)
2
3
4
5
6
7
8
45,000
2
68
65
62
59
56
53
50
70,000
2
68
65
62
59
56
53
50
90,000
2
60
57
55
52
50
47
45
2
25
22
20
17
15
12
10
3
58
55
52
49
46
43
40
115,000
Number of Elbows (3)
(1) One 90° elbow must be secured to the combustion air intake
connection.
WALL
(2) Minimum vent length is five feet and one elbow/tee.
INSIDE
OUTSIDE
(3) Tee used in the vent/flue termination must be included when
determining the number of elbows in the piping system.
TEE
or
90°ELBOW
TURNED
DOWN
(4) 3” diameter pipe can be used in place of 2” diameter pipe.
Vent/Flue Pipe Terminations
The vent/flue pipe may terminate vertically, as through a
roof, or horizontally, as through an outside wall.
COUPLING
ELBOW OR
COUPLING
Vertical vent/flue pipe terminations should be as shown in
the following figure. Refer to Section IX, Vent/Flue Pipe and
Combustion Air Pipe - Termination Locations for details
concerning location restrictions. The penetration of the
vent through the roof must be sealed tight with proper
flashing such as is used with a plastic plumbing vent.
MIN.
12"
FROM
WALL
12"
TO GROUND OR
HIGHEST ANTICIPATED
SNOW LEVEL
Horizontal Termination (Single Pipe)
18
12" MIN.
Direct Vent (Dual Pipe)
Maximum Allowable Length of Vent/Flue & Combustion
Air Intake Pipe (ft)
VENT/FLUE TEE
or
90° ELBOW TURNED
DOWN
Unit Input
(Btu)
45,000
12" MIN. ABOVE
HIGHEST ANTICIPATED
SNOW LEVEL
70,000
90,000
115,000
Horizontal Termination (Single Pipe)
Above Highest Anticipated Snow Level
115,000
In a basement installation, the vent/flue pipe can be run
between joist spaces. If the vent pipe must go below a joist
and then up into the last joist space to penetrate the header,
two 45° elbows should be used to reach the header rather
than two 90° elbows.
Vent/Flue/Air
Intake
Termination
Standard
Alternate
Standard
Alternate
Standard
Alternate
Standard
Alternate
Standard
Alternate
Pipe
(4)
Size
(in.)
2
2
2
2
2
2
2
2
3
3
Number of Elbows
2
68
55
68
5
55
42
26
7
88
74
3
65
52
65
52
52
39
23
10
87
70
4
62
49
62
49
49
36
20
5
59
46
59
46
46
33
(1)(2)(3)
6
56
43
56
43
43
30
7
53
40
53
40
40
27
8
50
37
50
37
37
24
Not Recommended
Not Recommended
80 76 72 68 64
66 62 58 54 50
(1)
Elbows and/or Tees used in the terminations must be included when
determining the number of elbows in the piping system.
(2)
Number of elbows tabulated are for each (Vent/Flue & Combustion air
intake) pipe.
Minimum length of each Vent/Flue & Combustion Air Intake pipe is
five feet and one elbow/tee.
(3)
(4)
3” diameter pipe can be used in place of 2” diameter pipe.
Vent/Flue and Combustion Air Pipe Terminations
The vent/flue and combustion air pipes may terminate
vertically, as through a roof, or horizontally, as through an
outside wall.
DIRECT VENT (DUAL PIPE) PIPING
The inlet air screens provided in the installation instruction
packet are available for the installer to use in the inlet of the
combustion air pipe to prevent animals from building nests
in the combustion air pipe. The installation of the screens
is not a requirement and will not effect performance if not
installed in the combustion air pipe.
Vertical pipe terminations should be as shown in the following figure. Refer to Section IX, Vent/Flue Pipe and Combustion Pipe - Termination Locations for details concerning
location restrictions. The penetrations through the roof
must be sealed tight with proper flashing such as is used
with a plastic plumbing vent.
Direct vent installations require both a combustion air
intake and a vent/flue pipe. The pipes may be run horizontally and exit through the side of the building or run vertically
and exit through the roof of the building. The pipes may be
run through an existing unused chimney; however, they
must extend a minimum of 12 inches above the top of the
chimney. The space between the pipes and the chimney
must be closed with a weather tight, corrosion resistant
flashing. Both the combustion air intake and a vent/flue
pipe terminations must be in the same atmospheric pressure zone. Refer to Section IX, Vent/Flue and Combustion
Air Pipe - Termination Locations or Concentric Vent Termination for specific details on termination construction. For
details concerning connection of pipes to the furnace, refer
to the Section IX, Vent/Flue Pipe and Combustion Pipe Standard Furnace Connections or Alternate Furnace Connections.
TEE
COMBUSTION
AIR INTAKE
12" MIN.
12" MIN.
TO ROOF OR
HIGHEST
ANTICIPATED
SNOW LEVEL
VENT/FLUE
90º
MEDIUM RADIUS
ELBOWS
SCREEN
24" MAX.
3" MIN.
Vertical Terminations (Dual Pipe)
Vent/Flue and Combustion Air Pipe Lengths and
Diameters
Refer to the following table for applicable length, elbows,
and pipe diameter for construction of the vent/flue and
combustion air intake pipe systems of a direct vent (dual
pipe) installation. The number of elbows tabulated represents the number of elbows and/or tees in each (Vent/Flue
& Combustion Air Intake) pipe. Elbows and/or tees used in
the terminations must be included when determining the
number of elbows in the piping systems.
Horizontal terminations should be as shown in the following
figure. Refer to Section IX, Vent/Flue Pipe and Combustion
Pipe - Termination Location for location restrictions. A
2 3/8 inch diameter wall penetration is required for 2”
diameter pipe while a 3 1/2 inch diameter hole is required
for 3” diameter pipe. To secure the pipe passing through
the wall and prohibit damage to piping connections, a
coupling should be installed on either side of the wall and
solvent cemented to a pipe connecting the two couplings.
The pipe length should be the wall thickness plus the depth
of the socket fittings to be installed on the inside and outside
of the wall. The wall penetration should be sealed with
silicone caulking material.
If the combustion air intake pipe is to be installed above a
finished ceiling or other area where dripping of condensate
will be objectionable, insulation of the combustion air pipe
may be required. Use 1/2” thick closed cell foam insulation
such as Armaflex or Insultube where required.
19
90°
Medium Radius
Elbow
12" MIN
Vent
3" MIN
24" MAX
VENT/FLUE
TEE
12" Min.
3" MIN
24" MAX
Screen
24" Max.
COMBUSTION
AIR INTAKE
90º
MEDIUM RADIUS
ELBOW
24" Max.
3" Min.
Air Intake
12" MIN
12" MIN
SCREEN
12" Min. Above
Highest Anticipated
Snow Level
Standard Horizontal Terminations
(Dual Pipe)
Alternate Vent Termination
Above Anticipated Snow Level (Dual Pipe)
In a basement installation, the pipes may be run between
the joist spaces. If the pipes must go below the joist and
then up into the last joist space to penetrate the header, two
45° elbows should be used to reach the header rather than
two 90° elbows.
VENT
90°
MEDIUM
RADIUS
ELBOW
24" MAX
VENT/INTAKE TERMINATIONS FOR INSTALLATION
OF MULTIPLE DIRECT VENT FURNACES
If more than one direct vent furnace is to be installed
vertically through a common roof top, maintain the same
minimum clearances between the exhaust vent and air
intake terminations of adjacent units as with the exhaust
vent and air intake terminations of a single unit.
24" MAX
3" MIN
AIR
INTAKE
12" MIN
SCREEN
Alternate Horizontal Vent Termination
(Dual Pipe)
If more than one direct vent furnace is to be installed
horizontally through a common side wall, maintain the
clearances as in the following figure. Always terminate all
exhaust vent outlets at the same elevation and always
terminate all air intakes at the same elevation.
12" MIN.
3" MIN.
24" MAX.
VENT/FLUE
TEE
SUPPORT
STRAPS
COMBUSTION
AIR INTAKE.
90°
SCREEN MEDIUM
RADIUS
ELBOWS
12" MIN. ABOVE
HIGHEST ANTICIPATED
SNOW LEVEL
90°
Medium
Radius
Elbows
12" MIN. ABOVE
HIGHEST ANTICIPATED
SNOW LEVEL
24" Max.
Standard Horizontal Terminations
Above Anticipated Snow Level (Dual Pipe)
Air
Intakes
Vents
3" Min. 24" Max.
3" Min.
24" Max.
3" Min.
Screen
12" Min.
Horizontal Venting Of Multiple Units
CONCENTRIC VENT TERMINATION
Refer to the directions provided with the concentric vent kit
for installation specifications.
20
X. Condensate Drain Lines
& Drain Trap
UPRIGHT INSTALLATIONS
In an upright installation drain hoses are connected to drain
ports on the rubber elbow and the recuperator coil front
cover. The drain lines are then routed through the right or
left side panel and into the drain trap secured to the outside
of the cabinet.
GENERAL
A condensing gas furnace achieves its high level of efficiency by extracting almost all of the heat from the products
of combustion and cooling them to the point where condensation takes place. The condensate which is generated
must be piped to an appropriate drain location.
NOTE: Refer to Section X, Condensate Drain Lines and
Drain Trap - Alternate Vent/Flue Hose Connections for
upright installations using an alternate vent/flue outlet.
Standard Right or Left Side Drain Hose Connections
Upright installations using the standard vent/flue outlet
require drain hoses to be connected as follows. The
following quantity of hoses, tubes, and hose clamps are
provided with the unit.
In upright installations, the furnace’s drain hoses may exit
either the right or left side of the furnace. NOTE: If the
alternate vent/flue outlet is utilized in an upright installation,
the drain trap and drain connections must be located on the
same side as the alternate vent/flue outlet.
In horizontal installations, the drain hoses will exit through
the bottom (down side) of the unit with the drain trap
suspended beneath the furnace. The field-supplied drain
system must be in accordance with all local codes and the
instructions in the following sections.
HOSE A
QTY: 1
HOSE B
QTY: 1
In upright upflow installations, the drain
trap must be mounted on the opposite side
of the unit from the junction box. This will
reduce the risk of water reaching the
junction box in the event of a blocked drain
condition. Failure to follow these
instructions can result in possible death,
personal injury, or property damage due to
electrical shock.
TUBE 2
QTY: 2
GREEN
HOSE CLAMPS
QTY: 3
•
•
•
•
•
•
RED
HOSE CLAMPS
QTY: 2
Hose and Tube Identification
1. Remove the rubber plug from the front cover drain port
(right or left side, depending on the intended drain trap
mounting).
2. Secure Hose A to front cover drain port with a red hose
clamp. Route hose to rear side panel grommet hole.
Follow the bullets listed below when installing the drain
system. Refer to the following sections for specific details
concerning furnace drain trap installation and drain hose
hook ups.
•
QTY: 1
TUBE 1
WARNING
NOTE: For left side drainage, grommets will have to be
relocated to left side panel.
RIGHT SIDE
PANEL
RUBBER
ELBOW
The drain trap supplied with the furnace must be
used.
The drain line between furnace and drain location
must be constructed of 3/4” PVC or CPVC.
The drain line between furnace and drain location
must maintain a 1/4 inch per foot downward slope
toward the drain.
Do not trap the drain line in any other location than
at the drain trap supplied with the furnace.
Do not route the drain line outside where it may
freeze.
If the drain line is routed through an area which
may see temperatures near or below freezing,
precautions must be taken to prevent condensate
from freezing within the drain line.
If an air conditioning coil is installed with the
furnace, a common drain may be used. An open
tee must be installed in the drain line, near the
cooling coil, to relieve positive air pressure from
the coil’s plenum. This is necessary to prohibit any
interference with the function of the furnace’s drain
trap.
RUBBER ELBOW
DRAIN PORT
RED HOSE CLAMP
TUBE 1
HOSE
B
SIDE PANEL
GROMMET
HOLES
TUBE(S) 2
FRONT COVER
DRAIN PORT
RED HOSE
CLAMP
HOSE
A GREEN
HOSE
CLAMPS
(3 PLACES)
DRAIN
TRAP
Upright “Standard” Connections
Right Side
(Upflow Shown, Counterflow Similar)
21
LEFT
SIDE PANEL
FRONT COVER
DRAIN PORT
RUBBER
ELBOW
RED HOSE
CLAMP
RUBBER
ELBOW
DRAIN PORT
HOSE A
RED HOSE
CLAMP
SIDE PANEL
GROMMET
HOLES
Alternate Vent/Flue Drain Hose Connections
Upright installations using the alternate vent/flue outlet will
require “right-side only” drain hoses to be connected as
follows. Refer to Section IX, Vent/Flue Pipe and Combustion Air Pipe for details on alternate vent/flue pipe connection.
TUBE 1
TUBE(S) 2
GREEN HOSE
CLAMPS
(3 PLACES)
DRAIN
TRAP
HOSE B
1. Remove the rubber plug from the front cover right-side
drain port. Save for use in step 3.
2. Secure Hose A to front cover drain port with a red hose
clamp. Route hose to rear right side panel grommet
hole.
Upright “Standard” Connections
Left Side
(Upflow Shown, Counterflow Similar)
3. Cut and remove 1/4 inch from the end of the drain port
on the rubber elbow.
4. Insert Tube 1 into rubber elbow drain port and secure
with red hose clamp. Angle tube outward toward front
of furnace.
5. Right side drains
Cut 17 3/4 inches from the long end of Hose B and
discard. Secure the remaining hose to Tube 1 with a
green hose clamp. Route the other end of Hose B to
front right side panel grommet hole.
Left side drains
Cut “X” inches from the long end of Hose B and discard.
Refer to table for appropriate length to cut. Secure
remaining hose to Tube 1 with a green hose clamp.
Route other end of Hose B to front left side panel
grommet hole.
Cabinet Width
(inches)
16 1/2
20 1/2
24 1/2
Model
(kBTU Tons)
045__30
070__30
070__40
090__40
090__50
115__50
NOTE: Ensure hoses and tubes maintain a downward
slope for proper drainage and that they are not kinked or
binding.
For details concerning mounting of the drain trap, refer to
Section X, Condensate Drain Lines and Drain Trap - Upright Drain Trap Mounting.
RUBBER ELBOW
(EXTERNALLY
MOUNTED)
FRONT COVER
DRAIN PORT
RUBBER
ELBOW
DRAIN PORT
RED HOSE CLAMP
TUBE 1
HOSE B
RED HOSE
CLAMP
HOSE A
TUBE(S) 2
GREEN HOSE
CLAMPS
(3 PLACES)
SIDE PANEL
GROMMET
HOLES
DRAIN TRAP
Upright “Alternate” Connections
Right Side Only
(Upflow Shown, Counterflow Similar)
"X" Length Cut From
Long End of Hose B
(inches)
3. Remove grommet from front right-side panel drain
hole. Seal hole in grommet with large end of plug.
Reinstall grommet and plug into side panel drain hole.
4. Cut 1/4 inch from the end of the drain port on the
externally mounted rubber elbow. Discard cut portion.
5. Insert Tube 1 into rubber elbow drain port and secure
with a red hose clamp. Angle tube outward toward front
of furnace.
6. Cut 17 7/8 inches from the long end of Hose B and
discard.
7. Secure remaining end of Hose B to exposed end of
Tube 1 with a green hose clamp. Route hose toward
right side panel grommet holes.
8. Insert short end of one Tube 2 through rear right side
panel grommet drain hole. Secure tube to Hose A with
a green hose clamp.
9. Insert short end of remaining Tube 2 into Hose B from
rubber elbow and secure with green hose clamp.
8 inches
4 inches
None
6. Insert short end of each Tube 2 through side panel
grommet holes. Secure tubes to Hose A and Hose B
with green hose clamps.
NOTE: Ensure hoses and tubes maintain a downward
slope for proper drainage and are not kinked or binding.
For details concerning mounting of the drain trap, refer to
22
the following section.
FRONT COVER
DRAIN PORT
Upright Drain Trap Mounting (Left or Right Side
Panel)
1. Insert drain tubes into drain trap and position the drain
trap against the side panel. NOTE: Drain tubes must
reach the bottom of the drain trap.
2. Secure drain trap to side panel at the mounting holes
(dimples or crosshairs on Counterflow models) located
below the grommet drain holes.
3. Attach PVC drain line to drain trap outlet with either a
90° elbow or coupling.
HOSE A
RED HOSE
CLAMP
HOSE B
SIDE PANEL
GROMMET
HOLES
FRONT
COVER
PRESSURE
TAP
RIGHT
SIDE
PANEL
TUBES 2
NOTE: Ensure hoses and tubes maintain a downward
slope for proper drainage and that they are not kinked or
binding.
DRAIN TRAP
RUBBER
ELBOW
GREEN
HOSE TUBE 1
CLAMP
(3 PLACES)
RUBBER ELBOW
DRAIN PORT
RED HOSE
CLAMP
Horizontal Connections
Right Side Down
(Upflow Shown, Counterflow Similar)
HORIZONTAL INSTALLATIONS
Right Side Down
Horizontal installations with the right side down require that
the drain hoses be connected to the right side front cover
drain port and the rubber elbow drain port.
3. Cut 1/4 inch from the end of the drain port on the rubber
elbow and discard.
4. Insert Tube 1 into rubber elbow drain port and secure
with a red hose clamp. Angle tube outward toward front
of furnace.
5. Cut 17 3/4 inches from the long end of Hose B and
discard.
6. Secure remaining end of Hose B to exposed end of
Tube 1 with a green hose clamp. Route hose to front
right down side panel grommet holes.
7. Cut 5 1/2 inches straight length from the long end of
each Tube 2.
8. Insert approximately one inch of each Tube 2 through
the right down side panel grommet holes. Secure tubes
to Hose A and Hose B using green hose clamps.
NOTE: On counterflow models, relocation of the front cover
pressure switch hose is required.
Make connections as follows:
1. Remove the rubber plug from the coil front cover drain
port.
Counterflow furnaces
Relocate the front cover pressure switch hose connection from the left side pressure tap to the right (down)
side tap. The pressure switch hose must be connected
to the down side to guard against blocked drain conditions. Cut hose to appropriate length to minimize
sagging. Plug left (unused) pressure tap with plug
removed from right side.
2. Secure Hose A to front cover drain tap with a red hose
clamp. Route hose to rear right (down) side panel
grommet holes.
NOTE: Ensure hoses and tubes maintain a downward
slope for proper drainage and are not kinked or bound.
For details concerning mounting of the drain trap, refer to
Section X, Condensate Drain Lines and Drain Trap - Upright
Drain Trap Mounting.
Left Side Down
Horizontal installations with the left side panel down will
require drain hoses to be connected to the left side front
cover drain port and the induced draft blower drain port.
NOTE: On upflow models, relocation of the front cover
pressure switch hose is required.
1. Remove the rubber plug from the coil front cover left
(down) side drain port.
2. Upflow furnaces
Relocate the front cover pressure switch hose connection from the right side (as shipped) pressure tap to the
left (down) side tap. The pressure switch hose must be
connected to the down side to guard against blocked
drain conditions. Cut hose to appropriate length to
minimize sagging. Plug right (unused) pressure tap
with plug removed from left side.
23
3. Secure Hose A to front cover drain port with a red hose
clamp. Route hose to rear left (down) side panel grommet holes. NOTE: For left side drainage, grommets
must be relocated to left side panel.
Hose B
Tube 1
INDUCED
DRAFT BLOWER
DRAIN PORT
HOSE B
FRONT
COVER
PRESSURE
TAP
LEFT SIDE
PANEL
HOSE A
Junction Box
GREEN HOSE
CLAMPS
(3 PLACES)
TUBE(S) 2
FRONT COVER
DRAIN PORT
Tube Installation with Green Hose Clamps
DRAIN TRAP
RED HOSE CLAMP
Counterflow Units with a 16 1/2” cabinet width.
Insert approximately one inch of cut Tube 2 through left
side panel grommet hole and secure to Hose A with a
hose clamp. Insert uncut Tube 2 through remaining
grommet hole and secure to Hose B with a green hose
clamp. NOTE: Tube must reach bottom of trap.
SIDE PANEL
GROMMET
HOLES
Horizontal Connections
Left Side Down
(Upflow Shown, Counterflow Similar)
4. Cut “X” inches from the long end of Hose B and discard.
Refer to table below for appropriate length to cut.
Cabinet Width
(inches)
16 1/2
20 1/2
24 1/2
Green Hose
Clamps
Short
Section of
Hose
Model
(kBTU Tons)
045__30
070__30
070__40
090__40
090__50
115__50
All Units with a 20 1/2” and 24 1/2” cabinet width.
Insert approximately one inch of each Tube 2 through
left side panel grommet hole. Secure tubes to Hose A
and Hose B with a green hose clamps. NOTE: Tube
must reach bottom of trap.
"X" Length Cut From
Long End of Hose B
(inches)
NOTE: Ensure hoses and tubes maintain a downward
slope for proper drainage and that they are not kinked or
binding.
For details concerning mounting of the drain trap, refer to
Section X, Condensate Drain Lines and Drain Trap - Upright Drain Trap Mounting.
8 inches
4 inches
None
Horizontal Drain Trap Mounting (Left or Right Side
Panel)
1. Position the drain trap against side panel with drain
tubes inserted into trap. Note that the trap may be
orientated with the outlet facing either the furnace’s top
cover or base pan.
2. Secure drain trap to side panel at the dimples or
crosshairs located on either side of the grommet drain
holes.
3. Confirm that tubes reach bottom of drain trap and that
all hoses maintain a downward slope and are not
kinked or binding.
4. Attach PVC drain line to drain trap outlet with either a
90° elbow or coupling.
5. Secure short end of Hose B to induced draft blower
drain port using a green hose clamp. Route hose to
front left (down) side panel grommet holes.
6. Cut 5 1/2 inches straight length from the long end of
each Tube 2.
7. Upflow Units with a 16 1/2” cabinet width.
Insert approximately one inch of cut Tube 2 through left
side panel grommet hole and secure to Hose A with a
hose clamp. Insert remaining Tube 2 through other
grommet hole and splice to Hose B with Tube 1, green
hose clamps and a short section of hose as shown
below. NOTE: Tube must reach bottom of trap.
24
WARNING
XI. Electrical Connections
In upright upflow installations, the drain
trap must be mounted on the opposite side
of the unit from the junction box. This will
reduce the risk of water reaching the
junction box in the event of a blocked drain
condition.
WARNING
To avoid the risk of electrical shock, wiring
to the unit must be properly polarized and
grounded.
Connect hot, neutral, and ground wires as shown in the
wiring diagram located on the unit’s blower door. For direct
vent applications, the cabinet opening to the junction box
must be sealed using the “liquid-tight” fitting provided.
Refer to the following figure.
WARNING
To avoid electrical shock, injury or death,
disconnect electrical power before
servicing or changing any electrical wiring.
CAUTION
Label all wires prior to disconnection when
servicing controls. Wiring errors can cause
improper and dangerous operation. Verify
proper operation after servicing.
WIRING HARNESS
The wiring harness is an integral part of this furnace. Field
alteration to comply with electrical codes should not be
required. Wires are color and number coded for identification purposes. Refer to the wiring diagram for wire routings.
If any of the original wire as supplied with the furnace must
be replaced, it must be replaced with wiring material having
a temperature rating of at least 105°C. Any replacement
wiring must be copper conductor.
Field-installed Wiring
Line polarity must be observed when making field connections. Line voltage connections can be made through either
the right or left side panel. The furnace is shipped configured for a left side (right side for counterflows) electrical
connection with the junction box located inside the blower
compartment. To make electrical connections through the
opposite side of the furnace, the junction box must be
relocated to the other side of the blower compartment prior
to making electrical connections. To relocate the junction
box, follow the steps shown below.
115 VOLT LINE CONNECTIONS
Before proceeding with electrical connections, ensure that
the supply voltage, frequency, and phase correspond to
that specified on the unit rating plate. Power supply to the
furnace must be N.E.C. Class 1, and must comply with all
applicable codes. The furnace must be electrically grounded
in accordance with local codes or, in their absence, with the
latest edition of The National Electric Code, ANSI NFPA 70
and/or The Canadian Electric Code CSA C22.1.
NOTE: Wire routing must not to interfere with circulator
blower operation, filter removal, or routine maintenance.
CAUTION
Edges of sheet metal holes may be sharp.
Use gloves as a precaution when removing
hole plugs.
Use a separate fused branch electrical circuit containing
properly sized wire, and fuse or circuit breaker. The fuse or
circuit breaker must be sized in accordance with the maximum overcurrent protection specified on the unit rating
plate. An electrical disconnect must be provided at the
furnace location.
1. Remove the burner compartment door.
2. Remove and save the two screws securing the junction
box to the side panel.
3. Relocate junction box and associated plugs and grommets to opposite side panel. Secure with screws
removed in step 2.
NOTE: Line polarity must be observed when making field
connections.
25
115 VOLT LINE CONNECTION OF ACCESSORIES
(HUMIDIFIER AND ELECTRONIC AIR CLEANER)
WARNING
To avoid electrical shock, injury or death,
disconnect electrical power before
servicing, or changing any electrical wiring.
*
ALTERNATE
JUNCTION BOX
LOCATION
*
*
*
*
*
*
*
*
STANDARD
JUNCTION BOX
LOCATION
The furnace’s integrated control module is equipped with
line voltage accessory terminals for controlling power to an
optional field-supplied humidifier and/or electronic air
cleaner.
Junction Box Relocation
The accessory load specifications are as follows:
Humidifier
Electronic Air Cleaner
WARNING
To avoid the risk of electrical shock, injury,
or death, the furnace must be electrically
grounded in accordance with local codes
or, in their absence, with the latest edition
of The National Electric Code.
Turn OFF power to the furnace before installing any accessories. Follow the humidifier or air cleaner manufacturers’
instructions for locating, mounting, grounding, and controlling these accessories. Accessory wiring connections are
to be made through the 1/4" quick connect terminals
provided on the furnace integrated control module. The
humidifier and electronic air cleaner hot and neutral terminals are identified as HUM and EAC. All field wiring must
conform to applicable codes. Connections should be made
as shown below.
To ensure proper unit grounding, the ground wire should
run from the furnace ground screw located inside the
furnace junction box all the way back to the electrical panel.
NOTE: Do not use gas piping as an electrical ground. To
confirm proper unit grounding, turn off the electrical power
and perform the following check.
OPTIONAL
ACCESSORIES
ELECTRONIC
AIR CLEANER
1. Measure resistance between the neutral (white) connection and one of the burners.
2. Resistance should measure 10 ohms or less.
EAC-H
120 VAC
HOT AND
PARK
TERMINALS
24 VOLT THERMOSTAT WIRING
W
R
Y
W
R
G
Y
G
W
R
C
HEATING
ROOM
THERMOSTAT
FURNACE
R
G
FURNACE
INTEGRATED
CONTROL
MODULE
12 PIN
CONNECTOR
Accessories Wiring
If it is necessary for the installer to supply additional line
voltage wiring to the inside of the furnace, the wiring must
conform to all local codes, and have a minimum temperature rating of 105°C. All line voltage wire splices must be
made inside the furnace junction box.
The integrated control module humidifier terminals (HUM)
are energized with 115 volts whenever the induced draft
blower is energized. The integrated control module electronic air cleaner terminals (EAC) are energized with 115
volts whenever the circulator blower is energized.
Y
C
C
HEATING AND
COOLING ROOM
THERMOSTAT
HUM-N
EAC-N
120 VAC
NEUTRAL
TERMINALS
NOTE: Wire routing must not interfere with circulator blower
operation, filter removal, or routine maintenance.
Low voltage connections can be made through either the
right or left side panel. Thermostat wiring entrance holes
are located adjacent to the junction box locations in the
blower compartment. Wire routing must not to interfere
with circulator blower operation, filter removal, or routine
maintenance. Refer to the following figure for thermostat
connections to the integrated control module terminal strip.
Y
HUM-H
HUMIDIFIER
This furnace is equipped with a blower door interlock switch
which interrupts unit voltage when the blower door is
opened for servicing. Do not defeat this switch.
W
1.0 Amp maximum at 120 VAC
1.0 Amp maximum at 120 VAC
REMOTE
CONDENSING
UNIT
Thermostat Diagram
This furnace is equipped with a 40 VA transformer to
facilitate use with most cooling equipment. Consult the
wiring diagram, located on the blower compartment door,
for further details of 115 Volt and 24 Volt wiring.
26
XII. Gas Supply and Piping
A different pressure switch may be required at high altitude
regardless of the BTU/ft3 content of the fuel used. Refer to
the product Specification Sheet or an distributor for a
tabular listing of appropriate altitude ranges and corresponding manufacturer’s pressure switch kits.
GENERAL
The furnace rating plate includes the approved furnace gas
input rating and gas types. The furnace must be equipped
to operate on the type of gas applied. This includes any
conversion kits required for alternate fuels and/or high
altitude.
Propane Gas Conversion
WARNING
Possible death, personal injury or property
damage may occur if the correct conversion
kits are not installed. The appropriate kits
must be applied to insure safe and proper
furnace operation. All conversions must
be performed by a qualified installer or
service agency.
CAUTION
To prevent unreliable operation or
equipment damage, the inlet gas supply
pressure must be as specified on the unit
rating plate with all other household gas
fired appliances operating.
This unit is configured for natural gas. The appropriate
manufacturer’s propane gas conversion kit, must be applied for propane gas installations. Refer to the “propane
gas and/or High Altitude Installations” section for details.
Inlet gas supply pressures must be maintained within the
ranges specified below. The supply pressure must be
constant and available with all other household gas fired
appliances operating. The minimum gas supply pressure
must be maintained to prevent unreliable ignition. The
maximum must not be exceeded to prevent unit overfiring.
Natural Gas
Propane Gas
Gas Valve
This unit is equipped with a 24 volt gas valve controlled
during furnace operation by the integrated control module.
As shipped, the valve is configured for natural gas. The
valve is field convertible for use with propane gas by
replacing the regulator spring with a propane gas spring
from an appropriate manufacturer’s propane gas conversion kit. Taps for measuring the gas supply pressure and
manifold pressure are provided on the valve.
Inlet Gas Supply Pressure
Minimum:5.0" W.C. Maximum :10.0" W.C.
Minimum:11.0" W.C. Maximum :13.0" W.C.
High Altitude Derate
When this furnace is installed at high altitude, the appropriate High Altitude orifice kit must be applied. This is required
due to the natural reduction in the density of both the gas
fuel and combustion air as altitude increases. The kit will
provide the proper design certified input rate within the
specified altitude range.
The gas valve has a manual ON/OFF control located on the
valve itself. This control may be set only to the “ON” or
“OFF” position. Refer to the lighting instructions label or the
“Putting the Furnace Into Operation” section for use of this
control during start up and shut down periods.
GAS PIPING CONNECTIONS
High altitude kits are purchased according to the installation
altitude and usage of either natural or propane gas. Refer
to the product Specification Sheet or an distributor for a
tabular listing of appropriate altitude ranges and corresponding manufacturer’s high altitude (Natural, propane
gas, and/or Pressure Switch) kits.
General
CAUTION
To avoid possible unsatisfactory operation
or equipment damage due to underfiring of
equipment, use the proper size of
natural/propane gas piping needed when
running pipe from the meter/tank to the
furnace.
Do not derate the furnace by adjusting the manifold pressure to a lower pressure than specified on the furnace rating
plate. The combination of the lower air density and a lower
manifold pressure will prohibit the burner orifice from drawing the proper amount of air into the burner. This may cause
incomplete combustion, flashback, and possible yellow
tipping.
When sizing a trunk line, be sure to include all appliances
which will operate simultaneously when sizing a trunk line.
The gas piping supplying the furnace must be properly
sized based on the gas flow required, specific gravity of the
gas, and length of the run. The gas line installation must
comply with local codes, or in their absence, with the latest
edition of the National Fuel Gas Code, NFPA 54/ANSI
Z223.1.
In some areas the gas supplier may artificially derate the
gas in an effort to compensate for the effects of altitude. If
the gas is artificially derated, the appropriate orifice size
must be determined based upon the BTU/ft3 content of the
derated gas and the altitude. Refer to the National Fuel Gas
Code, NFPA 54/ANSI Z223.1, and information provided by
the gas supplier to determine the proper orifice size.
27
MANUAL
SHUT OFF VALVE
(UPSTREAM FROM
GROUND JOINT
PIPE UNION)
GAS VALVE
MANIFOLD
MANUAL
SHUT OFF VALVE
(UPSTREAM FROM
GROUND JOINT
PIPE UNION)
BURNERS
ALTERNATE
GAS LINE
LOCATION
PLUG IN
ALTERNATE
GAS LINE
HOLE
HEIGHT REQUIRED
BY LOCAL CODE
HEIGHT REQUIRED
BY LOCAL CODE
*
*
*
*
*
*
*
*
*
GROUND JOINT
PIPE UNION
*
*
*
*
*
GROMMET
IN STANDARD
GAS LINE HOLE
*
*
*
PLUG IN
ALTERNATE
GAS LINE
HOLE
ALTERNATE
GAS LINE
LOCATION
*
*
*
GAS VALVE
GROMMET
IN STANDARD
GAS LINE HOLE
MANIFOLD
DRIP LEG
DRIP LEG
COUNTERFLOW
UPFLOW
MANUAL SHUT-OFF VALVE
(UPSTREAM FROM GROUND
JOINT PIPE UNION)
MANUAL SHUT-OFF VALVE
(UPSTREAM FROM GROUND
JOINT PIPE UNION)
GROUND JOINT
PIPE UNION
GROUND JOINT
PIPE UNION
DRIP LEG
DRIP LEG
GROMMET IN STANDARD
GAS LINE HOLE
GAS VALVE
BURNERS
GROUND JOINT
PIPE UNION
GROMMET IN STANDARD
GAS LINE HOLE
GAS VALVE
BURNERS
WR
OF F
3
2
1
TSTA T
S1
US
ON
S3
OFF
ON
Intell-Ig nition
87 4321
87 4321
9
6
12
3
CF M
S4
11
8
5
2
10
7
4
OF F
3
2
1
C
S1
TS TA T
S INGLE
TWO
US
ON
1
WR
ON
S3
OFF
8 7 4321
8 7 4321
6
9
12
S4
3
5
2
8
11
10
4
7
S I NGLE
1
CF M
Intell- Ign ition
CUT FOR
DE HUM
CUTFOR
DE HUM
BURNERS
C
TWO
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
DRAIN TRAP
DRAIN TRAP
MANIFOLD
MANIFOLD
ALTERNATE GAS
LINE LOCATION
ALTERNATE
GAS LINE LOCATION
PLUG IN ALTERNATE
GAS LINE HOLE
HORIZONTAL [UPFLOW MODEL]
PLUG IN ALTERNATE
GAS LINE HOLE
HORIZONTAL[COUNTERFLOW]
NOTES: 1. WHEN GAS LINE IS IN THE ALTERNATE
LOCATION, SWAP THE POSITION OF
THE PLUG AND GROMMET.
2. DRIP LEG MAY TERMINATE WITH
A 1/2" X 1/8" PIPE PLUG TO
ACCOMMODATE LINE GAS
PRESSURE MEASUREMENT.
Gas Piping Connections
28
Natural Gas Capacity of Pipe
In Cubic Feet of Gas Per Hour (CFH)
Length of
Nominal Black Pipe Size
Pipe in Feet
1/2"
3/4"
1"
1 1/4"
10
132
278
520
1050
20
92
190
350
730
30
73
152
285
590
40
63
130
245
500
50
56
115
215
440
60
50
105
195
400
70
46
96
180
370
80
43
90
170
350
90
40
84
160
320
100
38
79
150
305
(Pressure 0.5 psig or less and pressure drop of 0.3" W.C.; Based on
0.60 Specific Gravity Gas)
num-alloy tubing and connectors are coated to protect
against external corrosion when in contact with masonry, plaster, or insulation, or subjected to repeated
wetting by liquids such as water (except rain water),
detergents, or sewage.
1 1/2"
1600
1100
980
760
670
610
560
530
490
460
CAUTION
Edges of sheet metal holes may be sharp.
Use gloves as a precaution when removing
hole plugs.
Direct/Standard Inlet Piping
When gas piping enters directly to the gas valve through the
standard inlet hole, the installer must supply straight pipe
with a ground joint union to reach the exterior of the furnace.
The rigid pipe must be long enough to reach the outside of
the cabinet to seal the grommet cabinet penetration. A
semi-rigid connector to the gas piping can be used outside
the cabinet per local codes.
CFH = BTUH Furnace Input
Heating Value of Gas (BTU/Cubic Foot)
To connect the furnace to the building’s gas piping, the
installer must supply a ground joint union, drip leg, manual
shutoff valve, and line and fittings to connect to gas valve.
In some cases, the installer may also need to supply a
transition piece from 1/2" pipe to a larger pipe size.
Indirect/Alternate Inlet Piping
When gas piping enters indirectly to the gas valve through
the alternate gas inlet hole the following fittings (starting
from the gas valve) to reach the outside of the cabinet must
be supplied:
The following stipulations apply when connecting gas piping. Refer to the previous figures for typical gas line
connections to the furnace.
• Use black iron or steel pipe and fittings for the building
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
piping.
Use pipe joint compound on male threads only. Pipe
joint compound must be resistant to the action of the
fuel used.
Use ground joint unions.
Install a drip leg to trap dirt and moisture before it can
enter the gas valve. The drip leg must be a minimum
of three inches long.
Install a 1/8" NPT pipe plug fitting, accessible for test
gage connection, immediately upstream of the gas
supply connection to the furnace.
Use two pipe wrenches when making connection to the
gas valve to keep it from turning. The orientation of the
gas valve on the manifold must be maintained as
shipped from the factory.
Install a manual shutoff valve between the gas meter
and unit within six feet of the unit. If a union is installed,
the union must be downstream of the manual shutoff
valve, between the shutoff valve and the furnace.
Tighten all joints securely.
Connect the furnace to the building piping by one of the
following methods:
– Rigid metallic pipe and fittings.
– Semi-rigid metallic tubing and metallic fittings.
Aluminum alloy tubing must not be used in exterior
locations. In order to seal the grommet cabinet
penetration, rigid pipe must be used to reach the
outside of the cabinet. A semi-rigid connector to
the gas piping may be used from there.
Use listed gas appliance connectors in accordance
with their instructions. Connectors must be fully in the
same room as the furnace.
Protect connectors and semirigid tubing against physical and thermal damage when installed. Ensure alumi-
Coupling.
90 degree elbow.
2 inch close nipple.
90 degree elbow.
Straight pipe, with a ground joint union, to reach the
exterior of the furnace. The rigid pipe must be long
enough to reach the outside of the cabinet so as to seal
the grommet cabinet penetration. A semi-rigid connector to the gas piping can be used outside the cabinet per
local codes.
Gas Piping Checks
Before placing unit in operation, leak test the unit and gas
connections.
WARNING
To avoid the possibility of explosion or fire,
never use a match or open flame to test for
leaks.
Check for leaks using an approved chloride-free soap and
water solution, an electronic combustible gas detector, or
other approved testing methods.
NOTE: Never exceed specified pressures for testing.
Higher pressure may damage the gas valve and cause
subsequent overfiring, resulting in heat exchanger failure.
Disconnect this unit and shutoff valve from the gas supply
piping system before pressure testing the supply piping
system with pressures in excess of 1/2 psig (3.48 kPa).
Isolate this unit from the gas supply piping system by
closing its external manual gas shutoff valve before pressure testing supply piping system with test pressures equal
to or less than 1/2 psig (3.48 kPa).
29
Sizing Between First and Second Stage Regulator*
Maximum Propane Capacities listed are based on 2 psig pressure drop at 10 psig setting.
Capacities in 1,000 BTU/hour.
Pipe or
Nominal Pipe Size
Tubing
Tubing Size, O.D. Type L
Schedule 40
Length,
3/8"
1/2"
5/8"
3/4"
7/8"
1/2"
3/4"
Feet
10
730
1,700
3,200
5,300
8,300
3,200
7,500
20
500
1,100
2,200
3,700
5,800
2,200
4,200
30
400
920
2,000
2,900
4,700
1,800
4,000
40
370
850
1,700
2,700
4,100
1,600
3,700
50
330
770
1,500
2,400
3,700
1,500
3,400
60
300
700
1,300
2,200
3,300
1,300
3,100
80
260
610
1,200
1,900
2,900
1,200
2,600
100
220
540
1,000
1,700
2,600
1,000
2,300
125
200
490
900
1,400
2,300
900
2,100
150
190
430
830
1,300
2,100
830
1,900
175
170
400
780
1,200
1,900
770
1,700
200
160
380
730
1,100
1,800
720
1,500
To convert to capacities at 15 psig settings - multiply by 1.130
To convert to capacities at 5 psig settings - multiply by 0.879
Sizing Between Single or Second Stage Regulator and Appliance*
Maximum Propane Capacities Listed are Based on 1/2" W.C. pressure drop at 11" W.C. setting.
Capacities in 1,000 BTU/hour.
Pipe or
Nominal Pipe Size
Tubing
Tubing Size, O.D. Type L
Schedule 40
Length,
3/8"
1/2"
5/8"
3/4"
7/8" 1-1/8" 1/2"
3/4"
1"
1-1/4" 1-1/2"
Feet
10
39
92
199
329
501
935
275
567
1,071 2,205 3,307
20
26
62
131
216
346
630
189
393
732
1,496 2,299
30
21
50
107
181
277
500
152
315
590
1,212 1,858
40
19
41
90
145
233
427
129
267
504
1,039 1,559
50
18
37
79
131
198
376
114
237
448
913
1,417
60
16
35
72
121
187
340
103
217
409
834
1,275
80
13
29
62
104
155
289
89
185
346
724
1,066
100
11
26
55
90
138
255
78
162
307
630
976
125
10
24
48
81
122
224
69
146
275
567
866
150
9
21
43
72
109
202
63
132
252
511
787
200
8
19
39
66
100
187
54
112
209
439
665
250
8
17
36
60
93
172
48
100
185
390
590
*Data in accordance with NFPA pamphlet NO. 54
Propane Gas Piping Charts
30
XIII. Circulating Air & Filters
Propane Gas Tanks and Piping
WARNING
DUCTWORK - AIR FLOW
Duct systems and register sizes must be properly designed
for the CFM and external static pressure rating of the
furnace. Ductwork should be designed in accordance with
the recommended methods of “Air Conditioning Contractors of America” Manual D.
A duct system must be installed in accordance with Standards of the National Board of Fire Underwriters for the
Installation of Air Conditioning, Warm Air Heating and
Ventilating Systems. Pamphlets No. 90A and 90B.
A closed return duct system must be used, with the return
duct connected to the furnace. NOTE: Ductwork must
never be attached to the back of the furnace. Supply and
return connections to the furnace may be made with flexible
joints to reduce noise transmission. To prevent the blower
from interfering with combustion air or draft when a central
return is used, a connecting duct must be installed between
the unit and the utility room wall. A room, closet, or alcove
must not be used as a return air chamber.
When the furnace is used in connection with a cooling unit,
the furnace should be installed in parallel with or on the
upstream side of the cooling unit to avoid condensation in
the heating element. With a parallel flow arrangement, the
dampers or other means used to control the flow of air must
be adequate to prevent chilled air from entering the furnace
and, if manually operated, must be equipped with means to
prevent operation of either unit unless the damper is in the
full heat or cool position.
When the furnace is installed without a cooling coil, it is
recommended that a removable access panel be provided
in the outlet air duct. This opening shall be accessible when
the furnace is installed and shall be of such a size that the
heat exchanger can be viewed for visual light inspection or
such that a sampling probe can be inserted into the airstream. The access panel must be made to prevent air
leaks when the furnace is in operation.
When the furnace is heating, the temperature of the return
air entering the furnace must be between 55°F and 100°F.
Propane gas is heavier than air and any
leaking gas can settle in any low areas or
confined spaces. To prevent death,
personal injury, or property damage due to
fire or explosion caused by a propane gas
leak, install a gas detection warning device.
A gas detecting warning system is the only reliable way to
detect a propane gas leak. Rust can reduce the level of
odorant in propane gas. Do not rely on your sense of smell.
Contact a local propane gas supplier about installing a gas
detecting warning system. If the presence of gas is suspected, follow the instructions on Page 4 of this manual.
All propane gas equipment must conform to the safety
standards of the National Board of Fire Underwriters,
NBFU Manual 58.
For satisfactory operation, propane gas pressure must be
11 inch w.c. at the furnace manifold with all gas appliances
in operation. Maintaining proper gas pressure depends on
three main factors:
1. Vaporization rate, depending on temperature of the
liquid, and “wetted surface” area of the container or
containers.
2. Proper pressure regulation. (Two-stage regulation is
recommended for both cost and efficiency).
3. Pressure drop in lines between regulators, and between second stage regulator and the appliance. Pipe
size will depend on length of pipe run and total load of
all appliances.
Complete information regarding tank sizing for vaporization, recommended regulator settings, and pipe sizing is
available from most regulator manufacturers and propane
gas suppliers.
Since propane gas will quickly dissolve white lead and most
standard commercial compounds, special pipe dope must
be used. Shellac-based compounds resistant to the actions
of liquefied petroleum gases such as Gasolac®, Stalactic®,
Clyde’s® or John Crane® are satisfactory.
FILTERS - READ THIS SECTION BEFORE
INSTALLING THE RETURN AIR DUCTWORK
Filters must be used with this furnace. Discuss filter maintenance with the building owner. Filters do not ship with this
furnace, but must be provided by the installer. Filters must
comply with UL900 or CAN/ULCS111 standards. If the
furnace is installed without filters, the warranty will be
voided.
On upflow units, guide dimples locate the side return cutout
locations. Use a straight edge to scribe lines connecting the
dimples. Cut out the opening on these lines. NOTE: An
undersized opening will cause reduced airflow.
Upflow units with an air delivery of less than 1800 CFM
should either use the bottom return or one-side return.
Upflow units with an air delivery of 1800 CFM or higher must
either use a two-side return combination or a one-side
return and one bottom return combination. These combinations provide proper airflow through the unit.
To ensure proper unit performance follow the filter sizes
given in the Specifications Sheet.
Refer to the following illustration for typical propane gas
installations.
5 to 15 PSIG
(20 PSIG Max.)
First Stage
Regulator
200 PSIG
Maximum
Continuous
11" W.C.
Second Stage
Regulator
Propane Gas Installation (Typ.)
31
XIV. Startup Procedure &
Adjustment
UPRIGHT INSTALLATIONS
Depending on the installation and/or customer preference,
differing filter arrangements can be applied. Filters can be
installed in the central return register or a side panel
external filter rack kit (upflows). As an alternative a media
air filter or electronic air cleaner can be used as the
requested filter. Review and follow the filter sizes given in
the Specifications Sheet to ensure proper unit performance.
NOTE: Internal filter retention is not provided on GULA
furnaces.
The following figures show possible filter locations.
Furnace must have a 115 VAC power supply properly
connected and grounded. Proper polarity must be maintained for correct operation. In addition to the following
start-up and adjustment items, refer to further information
in Section XVI, Operational Checks.
HEAT ANTICIPATOR SETTING
The heat anticipator in the room thermostat must be correctly adjusted to obtain the proper number of cycles per
hour and to prevent “overshooting” of the setting. Set the
heat anticipator setting to 0.7 amps. Follow the thermostat
manufacturer’s instructions on how to adjust the heat
anticipator setting.
AIR FLOW
SIDE RETURN
EXTERNAL FILTER
RACK KIT
(EITHER SIDE)
DRAIN TRAP PRIMING
The drain trap must be primed prior to furnace startup. To
prime, fill the drain trap with water. This ensures proper
furnace drainage upon startup and prohibits the possibility
of flue gases escaping through the drain system.
FILTER
FILTER
CENTRAL
RETURN
GRILLE
FURNACE OPERATION
Purge gas lines of air prior to startup. Be sure not purge
lines into an enclosed burner compartment.
Check for leaks using an approved chloride-free soap and
water solution, an electronic combustible gas detector, or
other approved method. Verify that all required kits (propane gas, high altitude, etc.) have been appropriately
installed.
Possible Upright Upflow Filter Locations
R
R
FI
LT
E
E
LT
FI
RETURN
DUCT
Furnace Startup
1. Close the manual gas shut-off valve external to the
furnace.
2. Turn off the electrical power to the furnace.
3. Set the room thermostat to the lowest possible setting.
4. Remove the burner compartment door.
FILTER
FILTER
ACCESS
DOOR
CENTRAL
RETURN
GRILLE
FILTER
SUPPORT
BRACKET
(PROVIDED)
NOTE: This furnace is equipped with an ignition device
which automatically lights the burner. Do not try to light the
burner by hand.
5. Move the furnace gas valve manual control to the OFF
position.
6. Wait five minutes then smell for gas. Be sure check
near the floor as some types of gas are heavier than air.
7. If you smell gas after five minutes, immediately follow
the instructions on page 4 of this manual. If you do not
smell gas after five minutes, move the furnace gas
valve manual control to the ON position.
8. Replace the burner compartment door.
9. Open the manual gas shut-off valve external to the
furnace.
10. Turn on the electrical power to the furnace.
11. Adjust the thermostat to a setting above room temperature.
12. After the burners are lit, set the thermostat to desired
temperature.
AIR FLOW
Possible Upright Counterflow Filter Locations
HORIZONTAL INSTALLATIONS
Filters must be installed in either the central return register
or in the return air duct work.
Refer to the Specification Sheet for recommended minimum filter sizes.
32
Furnace Shutdown
1. Set the thermostat to the lowest setting.
The integrated control will close the gas valve and
extinguish flame. Following a 15 second delay, the
induced draft blower will be de-energized. After a 60,
90, 120, or 180 second delay period (field selectable),
the circulator blower will be de-energized.
2. Remove the burner compartment door and move the
furnace gas valve manual control to the OFF position.
3. Close the manual gas shut-off valve external to the
furnace.
4. Replace the burner compartment door.
Gas Line
Gas Shutoff Valve
Gas Line
To Furnace
Open To
Atmosphere
Drip Leg Cap
With Fitting
Manometer Hose
GAS SUPPLY PRESSURE MEASUREMENT
CAUTION
To prevent unreliable operation or
equipment damage, the inlet gas supply
pressure must be as specified on the unit
rating plate with all other household gas
fired appliances operating.
Manometer
Measuring Inlet Gas Pressure (Alt. Method)
NOTE: At either location, a hose fitting must be installed
prior to making the hose connection.
3. Turn ON the gas supply and operate the furnace and all
other gas consuming appliances on the same gas
supply line.
4. Measure furnace gas supply pressure with burners
firing. Supply pressure must be within the range
specified in the table below.
White-Rodgers 36F22 Gas Valve
The line pressure supplied to the gas valve must be within
the range specified below. The supply pressure can be
measured at the gas valve inlet pressure tap or at a hose
fitting installed in the gas piping drip leg. The supply
pressure must be measured with the burners operating. To
measure the gas supply pressure, use the following procedure.
Natural Gas
Propane Gas
If supply pressure differs from above, make necessary
adjustments to pressure regulator, gas piping size, etc.,
and/or consult with local gas utility.
Gas Valve
On/Off
Selector
Switch
INLET
Inlet Pressure Tap
(Side of Valve) Pressure Regulator
Adjustment
(Under Cap Screw)
Inlet Gas Supply Pressure
Minimum:5.0" W.C. Maximum :10.0" W.C.
Minimum:11.0" W.C. Maximum :13.0" W.C.
5. Turn OFF gas to furnace at the manual shutoff valve
and disconnect manometer. Reinstall plug before
turning on gas to furnace.
6. Turn OFF any unnecessary gas appliances started in
step 3.
OUTLET
Outlet (Manifold)
Pressure Tap
White-Rodgers Model 36F22
1. Turn OFF gas to furnace at the manual gas shutoff
valve external to the furnace.
2. Connect a calibrated water manometer (or appropriate
gas pressure gauge) at either the gas valve inlet
pressure tap or the gas piping drip leg.
33
White-Rodgers 36G22 Gas Valve
GAS MANIFOLD PRESSURE MEASUREMENT AND
ADJUSTMENT
The line pressure supplied to the gas valve must be within
the range specified below. The supply pressure can be
measured at the gas valve inlet pressure tap or at a hose
fitting installed in the gas piping drip leg. The supply
pressure must be measured with the unit OFF. To measure
the gas supply inlet pressure, use the following procedure.
Gas Valve
On/Off
Selector
Switch
CAUTION
To prevent unreliable operation or
equipment damage, the gas manifold
pressure must be as specified on the unit
rating plate. Only minor adjustments
should be made by adjusting the gas valve
pressure regulator.
Inlet Pressure
Tap
White-Rodgers 36F22 Gas Valve
Only small variations in gas pressure should be made by
adjusting the gas valve pressure regulator. The manifold
pressure must be measured with the burners operating. To
measure and adjust the manifold pressure, use the following procedure.
INLET
OUTLET
Pressure Regulator
Adjustment
(Under Cap Screw)
Outlet Pressure
Tap
1. Turn OFF gas to furnace at the manual gas shutoff
valve external to the furnace.
2. Connect a calibrated water manometer (or appropriate
gas pressure gauge) at the gas valve outlet pressure
tap (refer to gas valve figure in previous section).
3. Turn ON the gas supply and operate the furnace.
4. Measure gas manifold pressure with burners firing.
Adjust manifold pressure using the table below.
White-Rodgers Model 36G22
1. Turn OFF gas to furnace at the manual gas shutoff
valve external to the furnace.
2. Using 3/32 hex wrench, loosen inlet pressure tap screw
one turn.
3. Connect a 5/16 inch hose and calibrated water manometer to the gas valve inlet pressure tap. The hose
should overlap the tap by 3/8 inch.
4. Turn ON the gas supply and operate the furnace
5. Leak test. Using a leak detection solution or nonchlorine soap suds, check for leaks at hose connection.
Bubbles forming indicate a leak. SHUT OFF GAS AND
FIX ALL LEAKS IMMEDIATELY BEFORE PROCEEDING TO NEXT STEP!
4. Measure furnace gas supply pressure. Supply pressure must be within the range specified in the table
below.
Natural Gas
Propane Gas
Manifold Gas Pressure
Natural Gas
3.5" w.c.
Propane Gas
10.0" w.c.
The final manifold pressure must not vary more
than ± 0.3 “ w.c. from the above specified pressures. Any
necessary major changes in gas flow rate should be made
by changing the size of the burner orifice.
5. To adjust the gas valve pressure regulator, remove the
regulator cap.
6. Turn the adjustment screw clockwise to increase the
pressure, or counterclockwise to decrease the pressure.
7. Securely replace the regulator cap.
8. Turn OFF gas to furnace at the manual shutoff valve
and disconnect manometer.
9. Reinstall gas valve outlet pressure tap plug before
turning on gas to furnace.
Inlet Gas Supply Pressure
Minimum:5.0" W.C. Maximum :10.0" W.C.
Minimum:11.0" W.C. Maximum :13.0" W.C.
If supply pressure differs from above, make necessary
adjustments to pressure regulator, gas piping size, etc.,
and/or consult with local gas utility.
5. Turn OFF gas to furnace at the manual shutoff valve
and disconnect manometer and hose. Reinstall plug
before turning on gas to furnace.
6. Seal pressure port. Tighten inlet pressure tap screw
clockwise 7 in-lbs. minimum.
7. Retest for leaks. If bubbles form, shut down gas and fix
leaks immediately.
8. Turn valve switch ON.
White-Rodgers 36G22 Gas Valve
This valve is shipped from the factory with the regulator
preset (see control label).
Consult the appliance rating plate to ensure burner manifold pressure is as specified. If another outlet pressure is
required, follow these steps.
1. Turn OFF all electrical power to the system.
2. Using a 3/32 inch hex wrench, loosen outlet pressure
tap screw one turn. Do not remove screw.
34
3. Connect a calibrated water manometer and 5/16 inch
hose to the gas valve outlet pressure tap. Hose should
overlap tap by 3/8 inch.
3. Turn ON system power and set thermostat to a call for
heat.
4. Using a leak detection solution or non-chlorine soap
suds, check for leaks at hose connection. Bubbles
forming indicate a leak. SHUT OFF GAS AND FIX ALL
LEAKS IMMEDIATELY!
5. Remove regulator screw cover. Turn regulator screw
either clockwise to increase pressure or counterclockwise to decrease. Always adjust regulator to
provide the correct pressure according to the original
equipment manufacturer specifications listed on the
appliance rating plate.
GAS INPUT RATE MEASUREMENT (NATURAL GAS
ONLY)
The gas input rate to the furnace must never be greater than
that specified on the unit rating plate. To measure natural
gas input using the gas meter, use the following procedure.
1. Turn OFF the gas supply to all other gas-burning
appliances except the furnace.
2. While the furnace is operating, time and record one
complete revolution of the smallest gas meter dial.
3. Calculate the number of seconds per cubic foot (sec/
ft3) of gas being delivered to the furnace. If the dial is
a one cubic foot dial, divide the number of seconds
recorded in step 2 by one. If the dial is a two cubic foot
dial, divide the number of seconds recorded in step 2 by
two.
4. Calculate the furnace input in BTUs per hour (BTU/hr).
Input equals the sum of the installation’s gas heating
value and a conversion factor (hours to seconds)
divided by the number of seconds per cubic foot. The
measured input must not be greater than the input
indicated on the unit rating plate.
EXAMPLE:
Installation’s gas heating (HTG) value: 1,000 BTU/ft3
(Obtained from gas supplier)
Installation’s seconds per cubic foot: 34 sec/ ft3
Conversion Factor (hours to seconds): 3600 sec/hr
Input = (Htg. value x 3600) ÷ seconds per cubic foot
Input = (1,000 BTU/ft3 x 3600 sec/hr) ÷ 34 sec/ ft3
Input = 106,000 BTU/hr
6. Replace regulator screw cover and finger-tighten securely.
7. Turn OFF all electrical power to the system.
8. Remove manometer and hose from outlet pressure
tap.
9. Tighten outlet pressure tap clockwise 7 in-lbs minimum to seal port.
10. Turn ON system power and set thermostat to call for
heat.
11. Using a leak detection solution or non-chlorine soap
suds, check for leaks at hose connection. Bubbles
forming indicate a leak. SHUT OFF GAS AND FIX
ALL LEAKS IMMEDIATELY!
Measure gas manifold pressure with burners firing. Adjust
manifold pressure using the table below.
Minor changes to the input rate may be accomplished
through manifold pressure adjustments at the gas valve.
Refer to Section XIV, Startup Procedure and Adjustment Gas Manifold Pressure Measurement and Adjustment for
details. NOTE: The final manifold pressure cannot vary by
more than ± 0.3” w.c. from the specified setting. Consult
your local gas supplier if additional input rate adjustment is
required.
Manifold Gas Pressure
Natural Gas
3.5" w.c.
Propane Gas
10.0" w.c.
The final manifold pressure must not vary more
than ± 1.0” w.c. from the natural gas or ± 2.0” w.c. from the
propane gas specified pressures.
5. Turn ON gas to and relight all other appliances turned
off in step 1. Be certain that all appliances are functioning properly and that all pilot burners are operating.
Any necessary major changes in gas flow rate should be
made by changing the size of the burner orifice.
TEMPERATURE RISE
Temperature rise must be within the range specified on the
unit rating plate. An incorrect temperature rise may result in
condensing in or overheating of the heat exchanger. An
airflow and temperature rise table is provided in the specification sheet. Determine and adjust temperature rise as
follows:
1. Operate furnace with burners firing for approximately
ten minutes. Ensure all registers are open and all duct
dampers are in their final (fully or partially open) position.
2. Place thermometers in the return and supply ducts as
close to the furnace as possible. Thermometers must
not be influenced by radiant heat by being able to “see”
the heat exchanger.
35
To adjust the circulator blower speed, proceed as follows:
HEAT EXCHANGER
RADIATION "LINE OF SIGHT"
1. Turn OFF power to the furnace.
2. Select the heating and cooling blower speeds that
match the installation requirements from the airflow
table in the Specification Sheet.
3. Relocate desired motor leads to the circulator blower
heat and cool speed terminals on the integrated control
module. (Terminals are identified as HEAT and COOL
(hot)). If heating and cooling blower speeds are the
same, a jumper wire must be used between the heat
and cool terminals.
4. Connect all unused blower motor leads to the “PARK”
terminals on the integrated control module. Any leads
not connected to the “PARK” terminals must be taped.
5. Turn ON power to furnace.
6. Verify proper temperature rise as outlined in Section
XIV, Startup Procedure and Adjustment - Temperature
Rise.
SUPPLY
AIR
TSUPPLY
TRETURN
TRETURN
RETURN
AIR
Temperature Rise Measurement
Circulator Blower Speeds
Low
Red
Medium Low
Orange
Medium
Blue
High
Black
Common/Neutral
White
3. Subtract the return air temperature from the supply air
temperature to determine the air temperature rise.
Allow adequate time for thermometer readings to stabilize.
4. Adjust temperature rise by adjusting the circulator
blower speed. Increase blower speed to reduce temperature rise. Decrease blower speed to increase temperature rise. Refer to Section XIV, Startup Procedure
and Adjustment -Circulator Blower Speeds for speed
changing details.
BLOWER HEAT OFF DELAY TIMINGS
The integrated control module provides a selectable heat
off delay function. The heat off delay period may be set to
60, 90, 120, 180 seconds using the DIP switches or jumper
provided on the control module. The delay is factory shipped
at 90 seconds but may be changed to suit the installation
requirements and/or homeowner preference. Refer to the
following figures for switch positions and corresponding
delay times.
DIP Switches
90
Second
Delay
120
2 1
180
OFF
ON
ON
OFF
90
180
90
180
OFF
OFF
60
180
Second
Delay
90
60
120
Second
Delay
180
ON
ON
60
This furnace is equipped with a multi-speed circulator
blower. This blower provides ease in adjusting blower
speeds. The Specification Sheet provides an airflow table,
showing the relationship between airflow (CFM) and external static pressure (E.S.P.), for the proper selection of
heating and cooling speeds. The cooling blower speed is
shipped set on HIGH, and the heating blower speed is set
as indicated in the Specifications Sheet. These blower
speeds should be adjusted by the installer to match the
installation requirements so as to provide the correct heating temperature rise and the correct cooling CFM.
Jumper
60
60
Second
Delay
120
To prevent death, personal injury, property
damage, or premature failure of heat
exchanger, do not adjust the limit control
(factory set).
120
WARNING
120
CIRCULATOR BLOWER SPEEDS
2 1
-
2 1
T SUPPLY
2 1
RISE =
90
Heat Off Delay Switches
36
Timing Chart for Normal Heating Mode
CIRCULATOR
BLOWER
ON
OFF
GAS VALVE
OPEN
CLOSED
IGNITER
ON
OFF
PRESSURE SWITCH CLOSED
OPEN
CONTACTS
INDUCED DRAFT
BLOWER
ON
OFF
THERMOSTAT
ON
OFF
SECONDS
t ign
0
IGNITER
WARM UP PERIOD
(see note)
t circ
0
FIXED HEAT
ON DELAY:
30 SECONDS
15
[
60,90,
120 or
180
WR50T55
HAS A FIXED
90-SECOND
OFF DELAY
NOTE: WHITE-RODGERS 50A55 or 50T55 INTEGRATED CONTROL MODULE
HAS A VARIABLE STANDARD IGNITER WARM UP PERIOD BETWEEN
A 17-SECOND MAXIMUM AND A FIVE-SECOND MINIMUM.
WHITE-RODGERS 50A65 INTEGRATED CONTROL MODULE
HAS A 20-SECOND IGNITER WARM UP PERIOD (SILICON NITRIDE).
Timing Chart for Normal Cooling Operation
Indoor Fan
ON
OFF
Outdoor Fan
and
Compressor
ON
OFF
Thermostat
ON
OFF
Seconds
0
5
0
37
45
• Furnace circulator blower and outdoor cooling unit run,
XV. Normal Sequence
of Operation
•
POWER UP
The normal power up sequence is as follows:
•
•
•
•
•
•
•
115 VAC power applied to furnace.
Integrated control module performs internal checks.
Integrated control module flashes LED one time.
Integrated control module monitors safety circuits continuously.
Furnace awaits call from thermostat.
•
FAN ONLY MODE
The normal operational sequence in fan only mode is as
follows:
• R and G thermostat contacts close, initiating a call for
HEATING MODE
The normal operational sequence in heating mode is as
follows:
•
• R and W thermostat contacts close, initiating a call for
•
•
•
•
•
•
•
•
•
•
•
•
integrated control module monitors safety circuits continuously.
R and Y thermostat contacts open, completing the call
for cool.
Outdoor fan and compressor are de-energized.
Circulator blower is de-energized following a fixed forty
five second cool off delay period. Electronic air cleaner
terminals are de-energized.
Furnace awaits next call from thermostat.
•
heat.
Integrated control module performs safety circuit
checks.
Induced draft blower is energized causing pressure
switch contacts to close. Humidifier terminals are
energized with induced draft blower.
Igniter warm up begins upon close of pressure switch
contacts.
Gas valve opens at end of igniter warm up period,
delivering gas to burners and establishing flame.
Integrated control module monitors flame presence.
Gas valve will remain open only if flame is sensed.
Circulator blower is energized on heat speed following
a fixed thirty second blower on delay. Electronic air
cleaner terminals are energized with circulator blower.
Furnace runs, integrated control module monitors safety
circuits continuously.
R and W thermostat contacts open, completing the call
for heat.
Gas valve closes, extinguishing flame.
Induced draft blower is de-energized following a fifteen
second post purge. Humidifier terminals are de-energized.
Circulator blower is de-energized following 90 second
heat off delay period. Electronic air cleaner terminals
are de-energized.
Furnace awaits next call from thermostat.
•
•
•
•
fan.
Integrated control module performs safety circuit
checks.
Circulator blower is energized on cool speed. Electronic air cleaner terminals are energized.
Circulator blower runs, integrated control module monitors safety circuits continuously.
R and G thermostat contacts open, completing the call
for fan.
Circulator blower is de-energized. Electronic air cleaner
terminals are de-energized.
Furnace awaits next call from thermostat.
XVI. Operational Checks
BURNER FLAME
The burner flames should be inspected with the burner
compartment door installed. A sight glass is provided for
inspection purposes. Flames should be stable, quiet, soft,
and blue (dust may cause orange tips but they must not be
yellow). Flames should extend directly outward from the
burners without curling, floating, or lifting off. Flames must
not impinge on the sides of the heat exchanger firing tubes.
COOLING MODE
The normal operational sequence in cooling mode is as
follows:
Check the burner flames for:
1. Good adjustment
2. Stable, soft and blue
3. Not curling, floating, or lifting off.
• R and Y thermostat contacts close, initiating a call for
cool.
• Integrated control module performs safety circuit
•
•
checks.
Outdoor fan and compressor are energized.
Circulator blower is energized on cool speed following
a fixed five second on delay. Electronic air cleaner
terminals are energized with circulator blower.
Burner Flame
38
PRIMARY LIMIT
The primary limit control guards against overheating resulting from insufficient conditioned air passing over the heat
exchanger. If the primary limit control does not function
during this test, the cause must be determined and corrected. Function of this control should be verified by
gradually blocking the furnace return air after the furnace
has been operating (burners firing) for approximately ten
minutes. Check the control as follows:
XVII. Safety Circuit
Description
GENERAL
A number of safety circuits are employed to ensure safe
and proper furnace operation. These circuits serve to
control any potential safety hazards and serve as inputs in
the monitoring and diagnosis of abnormal function. These
circuits are continuously monitored during furnace operation by the integrated control module.
1. Allow the furnace to operate with burners firing continuously for approximately ten minutes.
2. Gradually block the return air to furnace. Remove
airflow blockage when limit control is activated and
turns off burners. Airflow blockage causes unit overheating and will produce the following reactions:
• The gas valve to close and extinguish flame,
• The induced draft blower to deenergized after a
fifteen second postpurge, and
• The circulator blower to remain energized continuously until limit control resets.
3. Remove the return air blockage to clear overheating
condition. After an acceptable temperature is reached
during the cool down period, the limit control will reset
and allow the furnace to resume normal operation.
INTEGRATED CONTROL MODULE
The integrated control module is an electronic device which
a potential safety concern is detected, the module will take
the necessary precautions and provide diagnostic information through an LED.
PRIMARY LIMIT
The primary limit control is located on the partition panel
and monitors heat exchanger compartment temperatures.
It is a normally-closed (electrically), automatic reset, temperature-activated sensor. The limit guards against the
overheating as a resulting of insufficient conditioned air
passing over the heat exchanger.
These checks establish that the primary limit control is
functioning and will respond to a restriction in the return air,
or a circulator blower failure. If the primary limit control does
not function during this test, the cause must be determined
and corrected.
AUXILIARY LIMIT
The auxiliary limit controls are located on or near the
circulator blower and monitors heat exchanger compartment temperatures. They are a normally-closed (electrically), manual-reset, temperature activated sensor. These
limits guard against overheating as a result of insufficient
conditioned air passing over the heat exchanger.
ROLLOUT LIMIT
The rollout limit controls are mounted on the burner/manifold assembly and monitor the burner flame. They are
normally-closed (electrically), manual-reset, temperatureactivated sensors. These limits guard against burner
flames not being properly drawn into the heat exchanger.
PRESSURE SWITCHES
The pressure switches are normally-open (closed during
operation), single-pole single-throw, negative air pressureactivated switches. They monitor the airflow (combustion
air and flue products) through the heat exchanger via
pressure taps located on the induced draft blower and the
coil front cover. These switches guard against insufficient
airflow (combustion air and flue products) through the heat
exchanger and/or blocked condensate drain conditions.
FLAME SENSOR
The flame sensor is a probe mounted to the burner/
manifold assembly which uses the principle of flame rectification to determine the presence or absence of flame.
39
3. Manual thermostat cycle. Lower the thermostat so that
there is no longer a call for heat then reset to previous
setting. Interrupt thermostat signal to the furnace for
0 - 20 seconds.
NOTE: If the condition which originally caused the lockout
still exists, the control will return to lockout. Refer to Section
XVIII, Troubleshooting - Diagnostic Chart for aid in
determining the cause.
XVIII. Troubleshooting
ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS
NOTE: Discharge body’s static electricity before touching
unit. An electrostatic discharge can adversely affect electrical
components.
XIX. Maintenance
Use the following precautions during furnace installation
and servicing to protect the integrated control module from
damage. By putting the furnace, the control, and the person
at the same electrostatic potential, these steps will help
avoid exposing the integrated control module to electrostatic discharge. This procedure is applicable to both
installed and uninstalled (ungrounded) furnaces.
WARNING
To avoid electrical shock, injury or death,
disconnect electrical power before
performing any maintenance.
1. Disconnect all power to the furnace. Do not touch the
integrated control module or any wire connected to the
control prior to discharging your body’s electrostatic
charge to ground.
2. Firmly touch a clean, unpainted, metal surface of the
furnaces near the control. Any tools held in a person’s
hand during grounding will be discharged.
3. Service integrated control module or connecting wiring
following the discharge process in step 2. Use caution
not to recharge your body with static electricity; (i.e., do
not move or shuffle your feet, do not touch ungrounded
objects, etc.). If you come in contact with an ungrounded object, repeat step 2 before touching control
or wires.
4. Discharge your body to ground before removing a new
control from its container. Follow steps 1 through 3 if
installing the control on a furnace. Return any old or
new controls to their containers before touching any
ungrounded object.
If you must handle the igniter, handle with
care. Touching the igniter element with
bare fingers, rough handling, or vibration
could damage the igniter resulting in
premature failure. Only a qualified servicer
should ever handle the igniter.
ANNUAL INSPECTION
The furnace should be inspected by a qualified installer, or
service agency at least once per year. This check should be
performed at the beginning of the heating season. This will
ensure that all furnace components are in proper working
order and that the heating system functions appropriately.
Pay particular attention to the following items. Repair or
service as necessary.
• Flue pipe system. Check for blockage and/or leakage.
DIAGNOSTIC CHART
WARNING
•
To avoid electrical shock, injury or death,
disconnect electrical power before
performing any service or maintenance.
•
•
Refer to the troubleshooting chart on the following pages for
assistance in determining the source of unit operational
problems. The red diagnostic LED blinks to assist in
troubleshooting the unit. The number of blinks refers to a
specific fault code.
•
•
Check the outside termination and the connections at
and internal to the furnace.
Heat exchanger. Check for corrosion and/or buildup
within the heat exchanger passageways.
Burners. Check for proper ignition, burner flame, and
flame sense.
Drainage system. Check for blockage and/or leakage.
Check hose connections at and internal to furnace.
Wiring. Check electrical connections for tightness and/
or corrosion. Check wires for damage.
Filters.
FILTERS
RESETTING FROM LOCKOUT
Furnace lockout results when a furnace is unable to achieve
ignition after three attempts, or when it has lost flame five
times during a single call for heat. It is characterized by a
non-functioning furnace and a one flash diagnostic LED
code. If the furnace is in “lockout”, it will (or can be) reset
in any of the following ways.
To ensure proper unit performance, adhere
to the filter sizes given in the Specifications
Sheet.
1. Automatic reset. The integrated control module will
automatically reset itself and attempt to resume normal
operations following a one hour lockout period.
2. Manual power interruption. Interrupt 115 volt power to
the furnace for 0 - 20 seconds.
Maintenance
Improper filter maintenance is the most common cause of
inadequate heating or cooling performance. Filters should
be cleaned (permanent) or replaced (disposable) every two
months or as required. When replacing a filter, it must be
replaced with a filter of the same type and size.
CAUTION
40
Troubleshooting Chart
Symptoms of Abnormal
Operation
Associated
LED Code2
• Furnace fails to operate.
• Integrated control
module diagnostic LED
provides no signal.
NONE
Fault Description(s)
• No 115 volt power to • Manual disconnect switch
furnace, or no 24 volt OFF, door switch open, or
power to integrated
24 volt wires improperly
control module.
connected or loose.
• Blown fuse or circuit • Blown fuse or circuit
breaker.
breaker.
• No signal from
thermostat.
• Furnace fails to operate.
ON
• Integrated control
module diagnostic LED
CONTINUOUS
is lit continuously.
Possible Causes
• Integrated control
module has an
internal fault.
• Improper thermostat
connection or setting.
• Integrated control module
has an internal fault.
Corrective Action
Cautions and Notes
• Assure 115 and 24 volt
• Turn power OFF
power to furnace
prior to repair.
integrated control
module.
• Check integrated control • Replace integrated
module fuse (3A).
control module
Replace if necessary.
fuse with 3A
• Check for possible shorts automotive fuse.
in 115 and 24 volt
• Improper thermocircuits. Repair as
stat connection or
necessary.
setting.
• Replace bad integrated
control module.
• Turn power OFF
prior to repair.
• Read precautions
in “Electrostatic
Discharge” section
of manual.
• Locate and correct gas
interruption.
• Check front cover
pressure switch
operation (hose, wiring,
contact operation).
Correct if necessary.
• Replace or realign
igniter.
• Check flame sense
signal. Sand sensor if
coated and/or oxidized.
• Check flue piping for
blockage, proper
length, elbows, and
termination.
• Verify proper induced
draft blower performance.
• Turn power OFF
prior to repair.
• Furnace fails to operate.
• Pressure switch
• Induced draft blower
circuit is closed.
pressure switch contacts
2
• Integrated control
sticking.
module diagnostic LED
• Induced draft blower
is flashing TWO (2)
•
Shorts
in pressure switch
is not operating.
2 FLASHES
flashes.
circuit.
• Replace induced draft
blower pressure
switch.
• Turn power OFF
prior to repair.
• Replace pressure
switch with proper
replacement part.
• Induced draft blower runs
• Pressure switch
• Pressure switch hose
continuously with no
circuit not closed.
blocked, pinched or
3
further furnace operation.
connected improperly.
• Induced draft blower
• Integrated control
• Blocked flue and/or inlet air
is
operating.
3 FLASHES
module diagnostic LED
pipe, blocked drain system,
is flashing THREE (3)
or weak induced draft
flashes.
blower.
• Inspect pressure
switch hose. Repair, if
necessary,
• Inspect flue and/or inlet
air piping for blockage,
proper length, elbows,
and termination. Check
drain system. Correct
as necessary.
• Correct pressure
switch setpoint or
contact motion.
• Tighten or correct
wiring connection.
ON
• Furnace fails to operate.
• Integrated control
module diagnostic LED
is flashing ONE (1) flash.
1
1 FLASH
• Furnace lockout due • Failure to establish flame.
to an excessive
Cause may be no gas to
number of ignition
burners, front cover
“retries” (3 total) or
pressure switch stuck open,
“recycles (5 total)1.
bad igniter or igniter
alignment, improper orifices,
or coated/oxidized or
improperly connected flame
sensor.
• Loss of flame after
establishment. Cause may
be interrupted gas supply,
lazy burner flames (improper gas pressure or
restriction in flue and/or
combustion air piping), front
cover pressure switch
opening, or improper
induced draft blower
performance.
• Incorrect pressure switch
setpoint or malfunctioning
switch contacts.
• Loose or improperly
connected wiring.
1
Integrated control module will automatically attempt to reset from lockout after one hour.
41
• Repair short.
• Igniter is fragile,
handle with care.
• Sand flame sensor
with emery cloth.
• See “Vent/Flue
Pipe” section for
piping details.
• Turn power OFF
prior to repair.
• Replace pressure
switch with proper
replacement part.
Troubleshooting Chart
Symptoms of Abnormal
Operation
Associated
LED Code2
• Circulator blower runs
continuously. No furnace
4
operation.
• Integrated control
module diagnostic LED 4 FLASHES
is flashing FOUR (4)
flashes.
Fault Description(s)
• Primary or auxiliary
limit circuit is open.
Possible Causes
• Insufficient conditioned air
over the heat exchanger.
Blocked filters, restrictive
ductwork, improper
circulator blower speed, or
failed circulator blower.
• Loose or improperly
connected wiring.
• Induced draft blower runs
continuously. No furnace
5
operation.
• Integrated control
module diagnostic LED 5 FLASHES
is flashing FIVE (5)
flashes.
• Furnace fails to operate.
• Integrated control
6
module diagnostic LED
is flashing SIX (6)
6 FLASHES
flashes.
• Rollout limit circuit is • Flame rollout.
open.
• Misaligned burners, blocked
flue and/or air inlet pipe, or
failed induced draft blower.
• Loose or improperly
connected wiring.
• Polarity of 115 or 24
volt power is
reversed.
• Polarity of 115 volt AC
power to furnace or
integrated control module is
reversed.
• Orange and gray wires to
transformer are reversed.
• Poor unit ground.
• Induced draft blower runs
continuously. No furnace
7
operation.
• Integrated control
module diagnostic LED 7 FLASHES
is flashing SEVEN (7)
flashes.
• Furnace not operating.
• Integrated control
module diagnostic LED
is flashing EIGHT (8)
flashes.
8
• Flame sense
microamp signal is
low.
• Flame sensor is coated/
oxidized.
• Flame sensor incorrectly
positioned in burner flame.
• Lazy burner flame due to
improper gas pressure or
combustion air.
• Improperly connected
igniter
• Problem with igniter
circuit.
White-Rodgers
50A65 Only
• Bad igniter
• Poor unit ground
8 FLASHES
• Induced draft blower runs
continuously. No furnace
C
operation.
• Integrated control
CONTINUOUS
module diagnostic LED
ON
is flashing continuously.
• Flame sensed with
no call for heat.
• Short to ground in flame
sense circuit.
42
Corrective Action
Cautions and Notes
• Check filters and
ductwork for blockage.
Clean filters or remove
obstruction.
• Check circulator blower
speed and performance. Correct speed
or replace blower if
necessary.
• Tighten or correct
wiring connection.
• Turn power OFF
prior to repair.
• Replace pressure
switch with proper
replacement part.
• Check burners for
proper alignment.
• Check flue and air inlet
piping for blockage,
proper length, elbows,
and termination.
Correct as necessary.
• Check induced draft
blower for proper
performance. Replace, if necessary.
• Tighten or correct
wiring connection.
• Turn power OFF
prior to repair.
• See “Vent/Flue
Pipe” section for
piping details.
• Review wiring diagram
to correct polarity.
• Turn power OFF
prior to repair.
• Ensure the correct
pressure switch
replacement is
used.
• Reverse orange and
gray wires going to
transformer.
• Verify proper ground.
Correct if necessary.
• Sand flame sensor is
coated/oxidized.
• Inspect for proper
sensor alignment.
• Check inlet air piping
for blockage, proper
length, elbows, and
termination.
• Compare current gas
pressure to rating plate
info. Adjust as
needed.
• Turn power OFF
prior to repair.
• Sand flame sensor
with emery clot.
• See “Vent/Flue
Pipe” section for
piping details.
• Check and correct
wiring from integrated
control module to
igniter
• Replace bad igniter
• Check and correct unit
ground wiring
• Turn power OFF
prior to repair.
• Replace igniter with
proper silicon
nitride replacement
part.
• Correct short at flame
sensor or in flame
sensor wiring.
• Turn power OFF
prior to repair.
• See rating plate for
proper gas
pressure.
Filter Removal
Depending on the installation, differing filter arrangements
can be applied. Filters can be installed in either the central
return register, the bottom of the blower compartment
(upflow only) or a side panel external filter rack (upflow
only). A media air filter or electronic air cleaner can be used
as an alternate filter. The filter sizes given in the Specifications Sheet must be followed to ensure proper unit performance. Refer to the following for removal and installation
of filters.
Front of Furnace
Front of Furnace
Blower
Blower
NOTE: Internal filter retention is not provided on GULA
furnaces.
c. Lower filter below top
rail.
Upright Upflow Filter Removal
To remove a filter from the bottom of the blower compartment:
Filter Removal Procedure
To remove filters from an external filter rack in an upright
upflow installation, follow the directions provided with external filter rack kit.
1. Turn OFF electrical power to furnace.
2. Remove blower compartment door.
3. Push back and up on the wire filter retainer to release
it from under the front lip of the furnace basepan.
4. Slide filter forward and out.
5. Replace filter by reversing the procedure for removal.
Horizontal Unit Filter Removal
Filters in horizontal installations are located in the central
return register or the ductwork near the furnace.
To remove:
To remove internal filter(s) from the retaining rails on the
side(s) of the blower compartment in an upright installation:
1. Turn OFF electrical power to furnace.
2. Remove filter(s) from the central return register or
ductwork.
3. Replace filter(s) by reversing the procedure for removal.
4. Turn ON electrical power to furnace.
Media Air Filter or Electronic Air Cleaner Removal
Follow the manufacturer’s directions for service.
1.
2.
3.
4.
Turn OFF electrical power to furnace.
Remove the blower compartment door.
Grasp the lower portion of the filter and lift up.
Angle the filter towards the blower until the filter is clear
of the bottom rail.
5. Lower the filter down and pull outward.
6. Replace the filter by reversing the procedure for removal.
Front of Furnace
Blower
Blower
BURNERS
Visually inspect the burner flames periodically during the
heating season. Turn on the furnace at the thermostat and
allow several minutes for flames to stabilize, since any
dislodged dust will alter the flames normal appearance.
Flames should be stable, quiet, soft, and blue (dust may
cause orange tips but they must not be yellow). They should
extend directly outward from the burners without curling,
floating, or lifting off. Flames must not impinge on the sides
of the heat exchanger firing tubes.
Filter
Front of Furnace
INDUCED DRAFT AND CIRCULATOR BLOWERS
The bearings in the induced draft blower and circulator
blower motors are permanently lubricated by the manufacturer. No further lubrication is required. Check motor
windings for accumulation of dust which may cause overheating. Clean as necessary.
Grab Here
And Lift
a. Lift filter above bottom
rail
d. Pull filter out.
b. Tilt filter to clear rail.
43
XX. Before Leaving
an Installation
CONDENSATE TRAP AND DRAIN SYSTEM
(QUALIFIED SERVICER ONLY)
Annually inspect the drain tubes, drain trap, and fieldsupplied drain line for proper condensate drainage. Check
drain system for hose connection tightness, blockage, and
leaks. Clean or repair as necessary.
• Cycle the furnace with the thermostat at least three
•
FLAME SENSOR (QUALIFIED SERVICER ONLY)
Under some conditions, the fuel or air supply can create a
nearly invisible coating on the flame sensor. This coating
acts as an insulator causing a drop in the flame sense
signal. If the flame sense signal drops too low the furnace
will not sense flame and will lock out. The flame sensor
should be carefully cleaned by a qualified servicer using
emery cloth or steel wool. Following cleaning, the flame
sense signal should be as indicated in the Specifications
Sheet.
•
times. Verify cooling and fan only operation.
Review the Owner’s Manual with the homeowner and
discuss proper furnace operation and maintenance.
Leave literature packet near furnace.
XXI. Repair &Replacement
Parts
• When ordering any of the listed functional parts, be
FLUE PASSAGES (QUALIFIED SERVICER ONLY)
The heat exchanger flue passageways should be inspected
at the beginning of each heating season. If necessary,
clean the passageways as outlined below.
•
•
1. Turn OFF the electrical power and gas supply to the
furnace.
2. Disconnect the gas line and remove the burner/ manifold assembly by removing the screws securing the
assembly to the partition panel.
3. Disconnect the flue pipe system from the induced draft
blower.
4. Remove the induced draft blower and, drain and pressure tap hoses from the recuperator coil front cover.
5. Remove the recuperator coil front cover to expose the
coil tubes and turbulators.
6. Remove the recuperator coil turbulators individually by
slowly pulling each turbulator forward firmly.
7. Clean the recuperator coil tubes using a long handle
wire brush, such as a gun cleaning brush.
8. Clean the primary heat exchanger tubes using a wire
brush attached to a length of high grade stainless steel
cable, such as drain cleanout cable. Attach a variable
speed reversible drill to the other end of the cable.
Slowly rotate the cable with the drill and insert it into one
of the heat exchanger tubes. While reversing the drill,
work the cable in and out several times to obtain
sufficient cleaning. Repeat for each tube.
9. Clean residue from furnace using a vacuum cleaner.
10. Replace the parts removed in the previous steps in
reverse order.
11. Turn on electrical power and gas to furnace. Check for
leaks and proper unit operation.
12. Severe heat exchanger fouling is an indication of an
operational problem. Perform the checks listed in
Section XIV, Startup Procedure and Adjustments to
reduce the chances of repeated fouling.
sure to provide the furnace model, manufacturing, and
serial numbers with the order.
Although only functional parts are shown in the parts
list, all sheet metal parts, doors, etc. may be ordered by
description.
Parts are available from your distributor.
Functional Parts ListGas Valve
Blower Motor
Gas Manifold
Blower Wheel
Natural Gas Orifice
Blower Mounting Bracket
Propane Gas Orifice
Blower Cutoff
Igniter
Blower Housing
Flame Sensor
Capacitor
Rollout Limit Switch
Heat Exchanger
Primary Limit Switch
Recuperator Coil
Auxiliary Limit Switch
Coil Front Cover
Pressure Switch
Integrated Control Module
Induced Draft Blower
Transformer
Door Switch
®
is a trademark of Maytag Worldwide N.V. and is used under license to Goodman
Company, L.P. All rights reserved.
44
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