Install Instructions

INSTALLATION INSTRUCTIONS FOR
*CVC96 & *MVC96
TWO-STAGE GAS FURNACE
(Type FSP CATEGORY IV Direct
or Non Direct Vent 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.
Installer:
Affix all manuals
adjacent to the unit.
As a professional installer you have an obligation to know
the product better than the customer. This includes all safety
precautions and related items.
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.
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.
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.
RECOGNIZE THIS SYMBOL
AS A SAFETY PRECAUTION.
*NOTE:
Please contact your distributor or our website for
the applicable Specification Sheet referred to in this manual.
IOG-2008
08/14
TABLE OF CONTENTS
SAFETY CONSIDERATIONS .................................... 3
SHIPPING INSPECTION ......................................... 4
ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS ................. 4
TO THE INSTALLER ........................................... 4
PRODUCT DESCRIPTION ....................................... 4
FEATURES ................................................... 4
PRODUCT APPLICATION ....................................... 5
LOCATION REQUIREMENTS & CONSIDERATIONS ........... 6
CLEARANCES AND ACCESSIBILITY ................................ 7
EXISTING FURNACE REMOVAL .................................. 7
THERMOSTAT LOCATION ....................................... 8
COMBUSTION & VENTILATION AIR REQUIREMENTS ................ 8
INSTALLATION POSITIONS .................................... 8
HORIZONTAL APPLICATIONS & CONSIDERATIONS ......... 9
FURNACE SUSPENSION ......................................... 9
FRONT COVER PRESSURE SWITCH TUBE LOCATION ............... 9
DRAIN TRAP AND LINES ....................................... 9
LEVELING ................................................... 9
ALTERNATE VENT/FLUE AND COMBUSTION AIR CONNECTIONS ..... 9
ALTERNATE ELECTRICAL AND GAS LINE CONNECTIONS ............ 10
DRAIN PAN ................................................. 10
FREEZE PROTECTION ......................................... 10
PROPANE GAS/HIGH ALTITUDE INSTALLATIONS .......... 10
VENT/FLUE PIPE & COMBUSTION AIR PIPE ................ 10
DUAL CERTIFICATION: NON-DIRECT/DIRECT VENT .............. 11
MATERIALS AND JOINING METHODS ............................ 11
PROPER VENT/FLUE AND COMBUSTION AIR PIPING PRACTICES .... 11
TERMINATION LOCATIONS ..................................... 12
CANADIAN VENTING REQUIREMENTS ............................ 12
STANDARD FURNACE CONNECTIONS ............................ 12
NON-DIRECT VENT (SINGLE PIPE) PIPING ..................... 14
VENT/INTAKE TERMINATIONS FOR INSTALLATION
OF MULTIPLE DIRECT VENT FURNACES .................... 17
CONCENTRIC VENT TERMINATION .............................. 17
SIDE WALL VENT KIT ....................................... 17
CONDENSATE DRAIN LINES & DRAIN TRAP ................ 17
GENERAL DRAIN INFORMATION ................................ 18
FIELD SUPPLIED DRAIN ...................................... 18
UPFLOW MODEL INSTALLED VERTICALLY ....................... 18
DRAIN EXITING RIGHT SIDE ................................... 18
DRAIN EXITING LEFT SIDE .................................... 18
UPFLOW MODEL INSTALLED HORIZONTALLY
WITH RIGHT SIDE DOWN ............................... 19
UPFLOW MODEL INSTALLED HORIZONTALLY WITH LEFT SIDE DOWN . 19
COUNTERFLOW MODEL INSTALLED VERTICALLY .................. 20
DRAIN EXITING LEFT SIDE .................................... 20
DRAIN EXITING RIGHT SIDE ................................... 20
COUNTERFLOW MODEL INSTALLED HORIZONTALLY
WITH RIGHT SIDE DOWN ............................... 20
COUNTERFLOW MODEL INSTALLED HORIZONTALLY
WITH LEFT SIDE DOWN ................................ 21
5151 San Felipe Suite 500
Houston, TX 77056
www.goodmanmfg.com • www.amana-hac.com
© 2014 Goodman Manufacturing Company, L.P.
is a registered trademark of Maytag Corporation or its related companies and is used under license. All rights reserved.
ELECTRICAL CONNECTIONS ................................. 21
WIRING HARNESS ........................................... 21
115 VOLT LINE CONNECTIONS ............................... 21
JUNCTION BOX RELOCATION .................................. 22
24 VOLT THERMOSTAT WIRING ............................... 22
SINGLE-STAGE HEATING THERMOSTAT APPLICATION .............. 23
24 VOLT DEHUMIDISTAT WIRING .............................. 23
FOSSIL FUEL APPLICATIONS ................................... 24
115 VOLT LINE CONNECTION OF ACCESSORIES
(HUMIDIFIER AND ELECTRONIC AIR CLEANER) ............. 24
AUXILIARY ALARM SWITCH: ................................... 25
GAS SUPPLY AND PIPING ...................................... 25
HIGH ALTITUDE DERATE ...................................... 25
PROPANE GAS CONVERSION ................................... 25
GAS PIPING CONNECTIONS .................................... 26
PROPANE GAS TANKS AND PIPING ............................. 28
CIRCULATING AIR & FILTERS ................................ 29
DUCT WORK - AIR FLOW .................................... 29
CHECKING DUCT STATIC ...................................... 29
BOTTOM RETURN AIR OPENING [UPFLOW MODELS] ............ 30
FILTERS - READ THIS SECTION BEFORE INSTALLING
THE RETURN AIR DUCT WORK .......................... 30
UPRIGHT INSTALLATIONS ...................................... 30
HORIZONTAL INSTALLATIONS ................................... 31
STARTUP PROCEDURE & ADJUSTMENT ..................... 31
DRAIN TRAP PRIMING ........................................ 31
FURNACE OPERATION ........................................ 31
GAS SUPPLY PRESSURE MEASUREMENT ......................... 31
GAS MANIFOLD PRESSURE MEASUREMENT AND ADJUSTMENT ...... 33
GAS INPUT RATE MEASUREMENT (NATURAL GAS ONLY) ......... 33
TEMPERATURE RISE .......................................... 34
CIRCULATOR BLOWER SPEEDS ................................. 34
BLOWER HEAT OFF DELAY TIMINGS ........................... 36
COMFORTNET™ SYSTEM ..................................... 37
OVERVIEW ................................................. 37
AIRFLOW CONSIDERATIONS .................................... 37
FOSSIL FUEL APPLICATIONS ................................... 37
CTK0* WIRING ................................................. 38
COMFORTNET SYSTEM ADVANCED FEATURES .................... 38
FURNACE ADVANCED FEATURES MENUS ........................ 39
THERMOSTAT MENU ......................................... 41
DIAGNOSTICS ................................................ 41
NETWORK TROUBLESHOOTING ................................. 41
SYSTEM TROUBLESHOOTING ................................... 42
NORMAL SEQUENCE OF OPERATION ........................ 42
POWER UP ................................................. 42
HEATING MODE ............................................. 42
COOLING MODE ............................................ 42
FAN ONLY MODE ........................................... 43
OPERATIONAL CHECKS ....................................... 43
SAFETY CIRCUIT DESCRIPTION .............................. 43
INTEGRATED CONTROL MODULE .............................. 43
PRIMARY LIMIT .............................................. 43
AUXILIARY LIMIT ............................................. 43
ROLLOUT LIMIT ............................................. 43
PRESSURE SWITCHES ......................................... 43
FLAME SENSOR ............................................. 43
TROUBLESHOOTING .......................................... 43
ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS ................ 43
DIAGNOSTIC CHART .......................................... 44
RESETTING FROM LOCKOUT .................................. 44
MAINTENANCE ................................................. 44
ANNUAL INSPECTION ......................................... 44
FILTERS .................................................... 44
BURNERS ................................................... 45
INDUCED DRAFT AND CIRCULATOR BLOWERS .................... 45
CONDENSATE TRAP AND DRAIN SYSTEM
(QUALIFIED SERVICER ONLY) ........................... 45
FLAME SENSOR (QUALIFIED SERVICER ONLY) .................. 45
FLUE PASSAGES (QUALIFIED SERVICER ONLY) .................. 45
BEFORE LEAVING AN INSTALLATION ........................ 45
REPAIR AND REPLACEMENT PARTS .......................... 45
DIP SWITCHES ................................................. 46
STATUS CODES ................................................ 47
TROUBLESHOOTING CHART ................................. 48
WIRING DIAGRAM ............................................. 54
SPECIAL INSTRUCTIONS FOR PRODUCTS INSTALLED .... 55
IN THE STATE OF MASSACHUSETTS ........................ 55
2
WARNING
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 , SERVICER AGENCY OR
THE GAS SUPPLIER .
GOODMAN WILL NOT BE RESPONSIBLE FOR ANY INJURY OR PROPERTY
DAMAGE ARISING FROM IMPROPER SERVICE OR SERVICE PROCEDURES.
IF YOU INSTALL OR PERFORM SERVICE ON THIS UNIT, YOU ASSUME
RESPONSIBILITY FOR ANY PERSONAL INJURY OR PROPERTY DAMAGE
WHICH MAY RESULT. MANY JURISDICTIONS REQUIRE A LICENSE TO
INSTALL OR SERVICE HEATING AND AIR CONDITIONING EQUIPMENT.
WARNING
SAFETY CONSIDERATIONS
IF THE INFORMATION IN THESE INSTRUCTIONS IS NOT FOLLOWED
EXACTLY, A FIRE OR EXPLOSION MAY RESULT CAUSING PROPERTY
DAMAGE , PERSONAL INJURY OR LOSS OF LIFE.
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:
D O NOT TRY TO LIGHT ANY APPLIANCE.
D O NOT TOUCH ANY ELECTRICAL SWITCH; DO NOT USE ANY PHONE
IN YOUR BUILDING .
IMMEDIATELY CALL YOUR GAS SUPPLIER FROM A NEIGHBOR’ S
PHONE. FOLLOW THE GAS SUPPLIER’S INSTRUCTIONS.
IF YOU CANNOT REACH YOUR GAS SUPPLIER, CALL THE FIRE
DEPARTMENT.
INSTALLATION AND SERVICE MUST BE PERFORMED BY A QUALIFIED
INSTALLER, SERVICE AGENCY OR THE GAS SUPPLIER.
Adhere to the following warnings and cautions when installing, adjusting, altering, servicing, or operating the furnace.
To ensure proper installation and operation, thoroughly read
this manual for specifics pertaining to the installation and
application of this product.
This furnace is manufactured for use with natural gas. It
may be field converted to operate on L.P. gas by using the
appropriate L.P. conversion kit listed in the PROPANE GAS/
HIGH ALTITUDE INSTALLATIONS section of this manual
Install this furnace only in a location and position as specified in LOCATION REQUIREMENTS & CONSIDERATIONS section and INSTALLATION POSITIONS section of this manual.
Provide adequate combustion and ventilation air to the furnace as specified in COMBUSTION & VENTILATION AIR REQUIREMENTS section of this manual.
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 C ALIFORNIA TO CAUSE CANCER , BIRTH
DEFECTS OR OTHER REPRODUCTIVE HARM .
Combustion products must be discharged to the outdoors.
Connect this furnace to an approved vent system only, as
specified in VENT/FLUE PIPE & COMBUSTION AIR PIPE section of this manual.
WARNING
Never test for gas leaks with an open flame. Use a commercially available soap solution made specifically for the detection of leaks to check all connections, as specified in GAS
SUPPLY AND PIPING section of this manual.
HEATING UNIT SHOULD NOT BE UTILIZED WITHOUT REASONABLE,
ROUTINE, INSPECTION , MAINTENANCE AND SUPERVISION . IF THE
Always install a furnace to operate within the furnace’s intended temperature-rise range with a duct system which has
external static pressure within the allowable range, as specified on the furnace rating plate and OPERATIONAL CHECKS
section of these instructions.
MAINTAINED AND MONITORED . IN THE EVENT THAT THE BUILDING
When a furnace is installed so that supply ducts carry air
circulated by the furnace to areas outside the space containing the furnace, the return air shall also be handled by duct(s)
sealed to the furnace casing and terminating outside the
space containing the furnace.
SHOULD BE DRAINED AS WELL AND , IN SUCH CASE , ALTERNATIVE HEAT
BUILDING IN WHICH ANY SUCH DEVICE IS LOCATED WILL BE VACANT,
CARE SHOULD BE TAKEN THAT SUCH DEVICE IS ROUTINELY INSPECTED,
MAYBE EXPOSED TO FREEZING TEMPERATURES AND WILL BE VACANT ,
ALL WATER -BEARING PIPES SHOULD BE DRAINED , THE BUILDING SHOULD
BE PROPERLY WINTERIZED , AND THE WATER SOURCE CLOSED . IN THE
EVENT THAT THE BUILDING MAY BE EXPOSED TO FREEZING
TEMPERATURES AND WILL BE VACANT , ANY HYDRONIC COIL UNITS
SOURCES SHOULD BE UTILIZED.
WARNING
A gas-fired furnace for installation in a residential garage
must be installed as specified in the LOCATION REQUIREMENTS AND CONSIDERATIONS section of this manual.
TO PREVENT POSSIBLE PROPERTY DAMAGE , PERSONAL INJURY OR
DEATH DUE TO ELECTRICAL SHOCK , THE FURNACE MUST BE LOCATED TO
PROTECT THE ELECTRICAL COMPONENTS FROM WATER .
This furnace may be used as a construction site heater only
if certain conditions are met. These conditions are listed in
the PRODUCT APPLICATION section of this manual.
Drain trap must be primed at time of installation. Trap is
internally partitioned; add water to both inlet ports until water appears at both sides of the outlet opening. Failure to
prime trap at time of installation may have a negative effect on combustion quality and pressure switch action.
3
ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS
DANGER
NOTE: Discharge your body’s static electricity before touching
unit. An electrostatic discharge can adversely affect electrical
components.
CARBON MONOXIDE POISONING HAZARD
Special warning for installation of furnaces or air handling units in enclosed area such as garages, utility rooms or parking areas. Carbon monoxide producing
devices (such as automobile, space heater, gas water heater, etc.) Should not be operated in enclosed areas such as unventilated garages or utility rooms because
of the danger of carbon monoxide (CO) poisoning resulting from the exhaust emissions. If a furnace or air handler is installed in an enclosed area and a carbon
monoxide producing device is operated therein, there must be adequate direct outside ventilation. Carbon monoxide emissions can be (re)circulated throughout
the structure if the furnace or air handler is operating in any mode. CO can cause serious illness including permanent brain damage or death.
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.
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.
DANGER
RISQUE D'EMPOISONNEMENT AU MONOXYDE DE CARBONE
Avertissement special au sujet de l'installation d'appareils de chauffage ou de traitement d'air dans des endroits clos, tets les garages, les locaux d'entretien et les
stationnements. Evitez de mettre en marche les appareils produisant du monoxyde de carbone (tels que les automobile, les appareils de chauffage autonome,etc.)
dans des endroits non ventilés tels que les d'empoisonnement au monoxyde de carbone. Si vous devez faire fonctionner ces appareils dans un endroit clos,
assures-vous qu'il y ait une ventilation directe provenant de l'exterie . Les émissions de monoxyde de carbone peuvent etre recircules dans les endroits clos,
si l'appareil de chauffage ou de traitement d'air sont en marche. Le monoxyde de carbone peut causer des maladies graves telles que des dommages permanents
au cerveau et meme la mort.
PELIGRO
' POR MONÓXIDO DE CARBONO
RIESGO DE INTOXICACIÓN
Advertencia especial para la instalación de calentadores ó maneja oras de aire en áreas cerradas como estacionamientos ó cuartos de servicio. Los equipos ó
aparatos que producen monóxido de carbono (tal como automóvil, calentador de gas, calentador de agua por medio de gas, etc) no deben ser operados en
áreas cerradas debido al riesgo de envenenamiento por monóxido de carbono (CO) que resulta de las emisiones de gases de combustión. Si el equipo ó
aparato se opera en dichas áreas, debe existir una adecuada ventilac ón directa al exterior. Las emisiones de monóxido de carbono pueden circular a través
del aparato cuando se opera en cualquier modo. El monóxido de carbono puede causar enfermedades severas como daño cerebral permanente ó muerte.
0140M00020-D
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.
WARNING
POSSIBLE PROPERTY DAMAGE , PERSONAL INJURY OR DEATH DUE TO
FIRE, EXPLOSION , SMOKE, SOOT, CONDENSATION , ELECTRICAL SHOCK
OR CARBON MONOXIDE MAY RESULT FROM IMPROPER INSTALLATION,
REPAIR OPERATION, OR MAINTENANCE OF THIS PRODUCT.
SHIPPING INSPECTION
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.
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.
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:
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
TO PREVENT PROPERTY DAMAGE , PERSONAL INJURY OR DEATH DUE TO
FIRE, DO NOT INSTALL THIS FURNACE IN A MOBILE HOME, TRAILER , OR
RECREATIONAL VEHICLE.
PRODUCT DESCRIPTION
FEATURES
This furnace is a part of the ComfortNet™ family of products.
The CTK0* ComfortNet thermostat kit allows this furnace to be
installed as part of a digitally communicating system. The
ComfortNet system provides automatic airflow configuration,
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.
4
enhanced setup features, and enhanced diagnostics. It also reduces the number of thermostat wires to a maximum of four. It
may be also installed as part of a non-communicating system
using a standard 24 VAC thermostat.
•
•
This product may be installed with the ComfortNet thermostat
and a non-ComfortNet compatible single stage air conditioning
unit. However, this reduces the benefits of the ComfortNet system as the enhancements will only apply to the furnace.
•
•
PRODUCT APPLICATION
This furnace is primarily designed for residential home-heating
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:
•
Schools, Office buildings, Churches, Retail stores,
Nursing homes, Hotels/motels, Common or office areas
A return air temperature range between 60ºF (16ºC)
and 80ºF (27ºC) is maintained.
Air filters are installed in the system and maintained
during construction replaced as appropriate during
construction, and upon completion of construction.
The input rate and temperature rise are set per the
furnace rating plate.
100% outside air is provided for combustion air
requirements during construction. Temporary ducting
can be used.
NOTE: Do not connect the temporary duct directly to
the furnace. The duct must be sized for adequate
combustion and ventilation in accordance with the latest
edition of the National Fuel Gas Code NFPA 54/ANSI
Z223.1 or CAN/CSA B149.1 Installation Codes.
The furnace heat exchanger, components, duct system,
air filters and evaporator coils are thoroughly cleaned
following final construction clean up.
All furnace operating conditions (including ignition, input
rate, temperature rise and venting) are verified
according to these installation instructions.
NOTE: The Commonwealth of Massachusetts requires that the
following additional requirements must also be met:
•
Gas furnaces must be installed by a licensed plumber or
gas fitter.
•
A T-handle gas cock must be used.
•
If the unit is to be installed in an attic, the passageway
to and the service area around the unit must have
flooring.
In such applications, the furnace must be installed with the following stipulations:
•
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 as a two-pipe systems for
combustion air.
•
All other warranty exclusions and restrictions apply This
furnace is an ETL dual-certified appliance and is
appropriate for use with natural or propane gas (NOTE:
If using propane, a propane conversion kit is required).
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
25 West 43rd Street, 4th Floor
New York, NY 10036
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.
National Fire Protection Association
1 Batterymarch Park
Quincy, MA 012169-7471
CSA International
8501 East Pleasant Valley
Independence, OH 44131
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.
This furnace may be used as a construction site heater ONLY if
all of the following conditions are met:
•
The vent system is permanently installed per these
installation instructions.
•
A room thermostat is used to control the furnace. Fixed
jumpers that provide continuous heating CANNOT be
used and can cause long term equipment damage.
•
Return air ducts are provided and sealed to the furnace.
5
A copy of the CAN/CSA B149 Installation Codes can also be
obtained from:
CSA International
178 Rexdale Boulevard
Etobicoke, Ontario, Canada M9W 1R3
•
•
LOCATION REQUIREMENTS & CONSIDERATIONS
Follow the instructions listed below and the guidelines provided
in the Combustion and Ventilation Air Requirements section when
selecting a furnace location.
•
WARNING
TO PREVENT POSSIBLE EQUIPMENT DAMAGE , PROPERTY DAMAGE,
PERSONAL INJURY OR DEATH , THE FOLLOWING BULLET POINTS MUST BE
OBSERVED WHEN INSTALLING THIS UNIT.
WARNING
POSSIBLE PROPERTY DAMAGE , PERSONAL INJURY OR DEATH DUE TO
FIRE, EXPLOSION , SMOKE, SOOT, CONDENSATION , ELECTRICAL SHOCK
OR CARBON MONOXIDE MAY RESULT FROM IMPROPER INSTALLATION,
REPAIR OPERATION, OR MAINTENANCE OF THIS PRODUCT.
•
•
•
•
•
•
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 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 condensate flows downwards to
the 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 Condensate Drain Lines and Trap for further details.
Ensure adequate combustion air is available for the
furnace. Improper or insufficient combustion air can
expose building occupants to gas combustion products
that could include carbon monoxide. Refer to
Combustion and Ventilation Air Requirements.
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 Horizontal Applications
and Considerations for leveling of horizontal furnaces.
•
•
•
6
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:
permanent wave solutions
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 Combustion and
Ventilation Air Requirements for details.
If the furnace is used in connection with a cooling coil
unit, install the furnace upstream or in parallel with the
cooling coil unit. Premature heat exchanger failure will
result if the cooling unit is placed ahead of the furnace.
For vertical (upflow or downflow) applications, the
minimum cooling coil width shall not be less than
furnace width minus 1”. Additionally, a coil installed
above an upflow furnace or under a counterflow
furnace may be the same width as the furnace or
may be one size larger than the furnace. Example:
a “C” width coil may be installed with a “B” width
furnace.
For upflow applications, the front of the coil and
furnace must face the same direction.
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.
•
•
•
•
•
NOTES:
•
For servicing or cleaning, a 24” front clearance is required.
•
Unit connections (electrical, flue and drain) may necessitate
greater clearances than the minimum clearances listed above.
•
In all cases, accessibility clearance must take precedence
over clearances from the enclosure where accessibility
clearances are greater.
If the furnace is installed horizontally, ensure the access
doors are not on the “up/top” or “down/bottom” side
of the furnace.
Do not connect this furnace to a chimney flue that
serves a separate appliance designed to burn solid
fuel.
On Counterflow Installations, the air conditioning
coil must be downstream on the supply (positive)
side of the furnace heat exchanger.
Counterflow Installation over a noncombustible
floor. Before setting the furnace over the plenum
opening, ensure the surface around the opening is
smooth and level. A tight seal should be made
between the furnace base and floor by using a
silicone rubber caulking compound or cement grout.
Counterflow Installation over a combustible floor. If
installation over a combustible floor becomes necessary,
use an accessory subbase (see Specification Sheet
applicable for your model for details.) 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. Follow the instructions with the subbase for
proper installation. Do not install the furnace directly
on carpeting, tile, or other combustible material other
than wood flooring. (NOTE: The subbase will not be
required if an air conditioning coil is installed between
the supply air opening on the furnace and the floor.)
CLEARANCES
AND
Installations must adhere to the clearances to combustible materials to which this furnace has been design certified. 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 clearance must be provided to accommodate these
connections. Refer to Vent/Flue Pipe and Combustion Air Pipe
for details.
NOTE: In addition to the required clearances to combustible
materials, a minimum of 24 inches service clearance must be
available in front of the unit.
TOP
TOP
S ID E
B O T TO M
U pflow
ACCESSIBILITY
REAR
C ou nte rflo w
H orizo n ta l
Figure 1
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 applicable to your model
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.
(INCHES)
SIDES
S ID E
B OTTO M
*MVC96* MINIM UM CLEARANCES TO COMBUSTIBLE MATERIALS
POSITION*
S ID E
FRONT
BOTTOM
FLUE
TOP
Upflow
0"
0"
3"
C
0"
1"
Horizontal
6"
0"
3"
C
0"
6"
C = If placed on combustible floor, floor MUST be wood only.
NOTES:
•
For servicing or cleaning, a 24” front clearance is required.
•
Unit connections (electrical, flue and drain) may necessitate
greater clearances than the minimum clearances listed above.
•
In all cases, accessibility clearance must take precedence
over clearances from the enclosure where accessibility
clearances are greater.
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.
*CVC96* MINIMUM CLEARANCES TO COMBUSTIBLE MATERIALS
The following vent testing procedure is reproduced from the
American National Standard/National Standard of Canada for
Gas-Fired Central Furnaces ANSI Z21.47, CSA-2.3 latest edition
Section 1.23.1.
(INCHES)
POSITION*
SIDES
REAR
FRONT
BOTTOM
FLUE
TOP
Counterflow
0"
0"
3"
NC
0"
1"
Horizontal
6"
0"
3"
C
0"
6"
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:
C = If placed on combustible floor, floor MUST be wood only.
NC = For installation on non-combustible floors only. A combustible subbase
must be used for installations on combustible flooring.
7
1. Seal any unused openings in the venting system.
•
•
•
•
2. Inspect the venting system for proper size and horizontal pitch, as required by the National Fuel Gas Code,
ANSI Z223.1 or the Natural Gas and Propane Installation Code, CSA B149.1-05 and these instructions. Determine that there is no blockage or restriction, leakage, corrosion and other deficiencies which could cause
an unsafe condition.
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.
Consult the instructions packaged with the thermostat for
mounting instructions and further precautions.
COMBUSTION & VENTILATION AIR REQUIREMENTS
3. As 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.
WARNING
TO AVOID PROPERTY DAMAGE , PERSONAL INJURY OR DEATH,
SUFFICIENT FRESH AIR FOR PROPER COMBUSTION AND VENTILATION OF
FLUE GASES MUST BE SUPPLIED .
4. Close fireplace dampers.
MOST HOMES REQUIRE OUTSIDE AIR BE
SUPPLIED INTO THE FURNACE AREA.
5. 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.
Improved construction and additional insulation in buildings have
reduced heat loss by reducing air infiltration 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.
6. Follow the lighting instructions. Place the appliance
being inspected in operation. Adjust thermostat so appliance shall operate continuously.
House depressurization can cause back drafting or improper
combustion of gas-fired appliances, thereby exposing building
occupants to gas combustion products that could include carbon monoxide.
7. Test for spillage from draft hood appliances at the draft
hood relief opening after 5 minutes of main burner
operation. Use the flame of a match or candle.
8. If improper venting is observed during any of the above
tests, the venting system must be corrected in accordance with the National Fuel Gas Code ANSI Z223.1/
NFPA 54 and/or National Gas and Propane Installation
Code CSA B149.1-05.
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 or CAN/CSA B149 Installation Codes
or applicable provisions of the local building codes for determining the combustion air requirements for the appliances.
9. 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.
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.
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 B149.1-05 Installation Codes.
INSTALLATION POSITIONS
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. Contact
your distributor 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.
THERMOSTAT LOCATION
The thermostat should be placed approximately five feet from
the floor on a vibration-free, inside wall in an area having good
air circulation. Do not install the thermostat where it may be
influenced by any of the following:
• Drafts, or dead spots behind doors, in corners, or under
cabinets.
• Hot or cold air from registers.
• Radiant heat from the sun.
8
HORIZONTAL APPLICATIONS & CONSIDERATIONS
DRAIN TRAP AND LINES
When installing a furnace horizontally, additional consideration
must be given to the following:
In horizontal applications the condensate drain trap is secured to
the furnace side panel, suspending it below the furnace. A minimum clearance of 5.5” 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 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.
FURNACE SUSPENSION
If suspending the furnace from rafters or joists, use 3/8" threaded
rod and 2”x2”x1/8” angle iron as shown in the following diagram. The length of rod will depend on the application and the
clearances necessary.
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.
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 have a slight tilt from back to front with the
access doors downhill from the back panel approximately 1/2
to 3/4 inches. The slight tilt allows the heat exchanger condensate, generated in the recuperator coil, to flow forward to the
recuperator coil front cover.
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. This
configuration allows the flue and combustion air piping to 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 Vent/Flue Pipe and Combustion Air Pipe for details concerning the conversion to the alternate vent/flue and combustion air connections.
2"X2"X3/8" ANGLE IRON
(3 PLACES)
Figure 2
FRONT COVER PRESSURE SWITCH TUBE LOCATION
When an upflow model is installed horizontally with left side
down or a counterflow model is installed horizontally with
right side down, the front cover pressure switch tube must
be re-located to the lower port of the collector box cover.
1. Remove tube from front cover pressure switch and
collector box cover.
2. Remove rubber plug from bottom collector box port
and install on top collector box port.
3. Locate 24” x 1/4” tube in parts bag.
4. Install one end on front cover pressure switch.
5. Route tube to lower port on collector box cover and
cut off excess tubing.
When using the horizontal alternate vent configuration, you must
use the RF000142 vent drain kit. See following illustration.
Alternate Vent/Flue Location
Figure 3A
9
For installations above 7000 feet, please refer to the furnace
Specification Sheets for required kit(s).
M anifo ld P ressure
Gas
A ltitude
Natural
0-7000
Figure 3B
P ro pane
1 LP M -08* suppo rts
Kit
Orifice
High
Stage
Lo w
Stage
P ressure
Switch
Change
No ne
# 45
3.5" w.c.
1.9" w.c.
No ne
1.25mm
10.0" w.c.
6.0" w.c.
No ne
LP M -08*
1
bo th Ho neywell and White-Ro dgers 2-stage valves
N O T E : In Canada, gas furnaces are o nly certified to 4500 feet.
Contact the 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.
Fibure 3C
Recommended Installation Positions
VENT/FLUE PIPE & COMBUSTION AIR PIPE
ALTERNATE ELECTRICAL AND GAS LINE CONNECTIONS
WARNING
FAILURE TO FOLLOW THESE INSTRUCTIONS CAN RESULT IN BODILY
INJURY OR DEATH . CAREFULLY READ AND FOLLOW ALL INSTRUCTIONS
GIVEN IN THIS SECTION .
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.
DRAIN PAN
WARNING
UPON COMPLETION OF THE FURNACE INSTALLATION, CAREFULLY
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).
INSPECT THE ENTIRE FLUE SYSTEM BOTH INSIDE AND OUTSIDE OF THE
FURNACE TO ASSURE IT IS PROPERLY SEALED . LEAKS IN THE FLUE
SYSTEM CAN RESULT IN SERIOUS PERSONAL INJURY OR DEATH DUE TO
FREEZE PROTECTION
EXPOSURE TO FLUE PRODUCTS, INCLUDING CARBON MONOXIDE.
Refer to Horizontal Applications and Conditions - Drain Trap and
Lines.
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.
PROPANE GAS/HIGH ALTITUDE INSTALLATIONS
WARNING
In addition to PVC and ABS pipe and fittings, Innoflue® by
Centrotherm Eco Systems and PolyPro® by M&G Duravent are
also approved vent and combustion air materials for installations in the U.S.A. and Canada. Manufacturers Installation
instructions for these products must be followed. These products have specific instructions for installing, joining and terminating. Do not mix materials or components of one manufacturer with materials or components of another manufacturer.
POSSIBLE PROPERTY DAMAGE , PERSONAL INJURY OR DEATH MAY
OCCUR IF THE CORRECT CONVERSION KITS ARE NOT INSTALLED . THE
APPROPRIATE KITS MUST BE APPLIED TO ENSURE SAFE AND PROPER
FURNACE OPERATION .
ALL CONVERSIONS MUST BE PERFORMED BY A
QUALIFIED INSTALLER OR SERVICE AGENCY.
This furnace is shipped from the factory configured for natural
gas at standard altitude. Propane gas installations require an
orifice and orifice change to compensate for the energy content
difference between natural and propane gas.
All furnaces are built with 2" vent / intake pipe and connectors. For furnaces requiring installation of 3" pipe, the transition from 2" to 3" should be done as close to the furnace as
practically possible.
High altitude installations may require both a pressure switch
and an orifice/spring 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.
10
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.
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.
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.
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
DUAL CERTIFICATION: NON-DIRECT/DIRECT VENT
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.
This furnace is dual certified and may be installed as a non-direct
vent (single pipe) or direct vent (dual pipe) appliance. A nondirect 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.
Some models require the use of 3” pipe. Do not transition
from a 2” to 3” pipe in a horizontal section of pipe as this
may create a water trap.
MATERIALS AND JOINING METHODS
PREFERRED
WARNING
TO AVOID BODILY INJURY, FIRE OR EXPLOSION, 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.
Two-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.
Figure 4
ACCEPTABLE
The use of Schedule 40 PVC or ABS cellular core (Foam Core)
plastic pipe is also acceptable as a flue/vent and intake pipe
material. 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 manufactures instructions
for cutting, cleaning and solvent cementing of PVC.
TRANSITION NO LESS
THAN 45 DEGREES TO
HORIZONTAL PLANE TO
AVOID CREATING A WATER
TRAP IN VENT PIPING.
For Canadian installations; all PVC pipe, fittings and joining
materials must be UL S636 listed.
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
Figure 5
11
•
NO TRANSITION ON
HORIZONTAL PLANE,
THIS CREATES A
WATER TRAP AND
RESTRICTS FLUE
GASES
•
•
Figure 6
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
to five 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.
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.
Non-Direct Vent
&
Direct Vent
Vent/Flue Terminations
Non-Direct Vent
Vent/Flue Termination
No Terminations
Above Walkway
<10'
3' min.
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.
4' min.
12"
4'
min.
12"
min.
Grade or Highest
Anticipated
Snow Level
12" min.
12" min.
Forced Air
Inlet
Non-Direct Vent
Vent/Flue Termination
Direct Vent
Vent/Flue Termination
Vent Termination Clearances
Figure 7
TERMINATION LOCATIONS
NOTE: In Canada, the Canadian Fuel Gas Code takes precedence
over the preceding termination restrictions.
NOTE: Refer to Location Requirements and Considerations for
combustion air contaminant restrictions.
CANADIAN VENTING REQUIREMENTS
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.
• 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
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).
In Canada, venting must conform to the requirements of the
current CAN/CSA-B149.1-05 Installation Code. Use only CSA-listed,
ULC-S636 compliant two- or three-inch diameter PVC or ABS pipe,
solvent cement, and fittings throughout. The certified piping
should be clearly marked with the ULC Std “S636” on the pipe
and fittings. Carefully follow the pipe manufacturers’ instructions for cutting, cleaning, and solvent cementing PVC and/or
ABS.
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.
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.
12
VENT/FLUE PIPE
ALTERNATE VENT/FLUE LOCATION
The vent pipe outlet is sized to accept 2” pipe. Secure vent/
flue pipe directly into the furnace fitting with the appropriate glue. Alternately, a small section of 2" pipe may be glued
in the furnace socket and a rubber coupling installed to allow
removal for future service. Combustion Air and Vent piping
should be routed in a manner to avoid contact with refrigerant lines, metering devices, condensate drain lines, etc. If
sary, clearances may be increased by creating an offset using two 45 degree elbows. This joint can be rotated on the
fitting to establish maximum clearance between refrigerant
lines, metering devices, and condensate drain lines, etc.
This joint is the equivalent of one 90 deg. elbow when considering elbow count.
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 and the “Alternate Vent/
Flue Location” figure. To use an alternate vent location on a
counterflow / horizontal model, a special kit is required.
NOTE: In the horizontal left installation position, a means of
condensate collection must be provided to keep vent pipe
condensate from entering the draft inducer housing. If the
vent drain elbow is eliminated from the installation, an
RF000142 kit must be used.
Insert flange. Cut 2 ½” long.
RF000142
V
E
N
T
45 DEGREE
LONG-SWEEP
ELBOWS
Increased Clearance Configuration
Figure 8
Figure 9
CUT HERE
NOTE: For non-direct vent installations, a minimum of one
90° elbow should be installed on the combustion air intake
coupling to guard against inadvertent blockage.
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. The combustion air intake pipe
can also be secured directly to the counterflow unit air intake pipe coupling.
Vent/Flue Pipe Cuts
Figure 10
1. Remove the four screws from the vent pipe flange on
top the furnace.
2. Remove the internal elbow and vent pipe
3. Cut 2 1/2" from the flange .
4. Remove plastic plug in line with the inducer outlet
5. Install cut end of the flanged section and connect to
inducer with rubber coupling supplied with furnace.
6. Install screws removed in step 1 securing flange to
cabinet.
NON-DIRECT VENT INSTALLATIONS
A minimum of one 90° elbow should be installed on the combustion air intake “coupling” to guard against inadvertent blockage.
WARNING
EDGES OF SHEET METAL HOLES MAY BE SHARP. USE GLOVES AS A
PRECAUTION WHEN REMOVING HOLE PLUGS .
13
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.
WARNING
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 FIELDSUPPLIED VENT /FLUE PIPING , AS DAMAGE CAN RESULT IN LEAKS
CAUSING BODILY INJURY OR DEATH DUE TO EXPOSURE TO FLUE GASES,
*MVC96/*CVC96 Direct Vent (2 - Pipe) and Non-Direct Vent (1- Pipe)
(6)
Maximum Allowable Length of Vent/Flue Pipe
& Combustion Air Pipe (ft)
INCLUDING CARBON MONOXIDE
Unit Input
(Btu)
ALTERNATE COMBUSTION AIR PROVISION
(Upflow / Horizontal models only)
When using the alternate venting location, either in a horizontal left side down installation or a vertical installation
using down – venting, an alternate combustion air opening
can be used. A locating dimple is located on the right side of
the furnace cabinet. The locating dimple is 1 7/8" measured from the front edge of the cabinet in line with the
knock out. To use the alternate combustion air location:
1. Remove screws and combustion air flange from
cabinet.
2. Insert cabinet plug in unused combustion air hole.
3. Drill a pilot hole at the cabinet dimple (size dictated
by knockout tool used).
4. Use a knockout tool to create a 3" diameter hole
5. Install combustion air flange and secure with screws
removed in step one.
40,000
60,000
(in.)
2
or 2 1/2
2
or 2 1/2
(3) (5)
1
2
3
4
5
6
7
8
120
115
110
105
100
95
90
85
95
90
85
80
75
70
65
60
80,000 "B"
2 or 2 1/2
75
70
65
60
55
50
45
40
80,000 "B"
80,000 "C"
80,000 "C"
100,000
100,000
120,000
120,000
3
2 or 2 1/2
3
2 or 2 1/2
3
2 or 2 1/2
3
200
25
200
25
200
45
95
193
20
193
20
193
40
90
186
15
186
15
186
35
85
179
10
179
10
179
30
80
172
5
172
5
172
25
75
165
N/A
165
N/A
165
20
70
158
N/A
158
N/A
158
15
65
151
N/A
151
N/A
151
10
60
1)
2)
3)
4)
5)
6)
CAUTION
Number of Elbows
Pipe Size
(4)
(1) (2)
Maximum allowable limits listed on individual lengths for inlet and flue and
NOT a combination.
Minimum requirement for each vent pipe is five (5) feet in length and one
elbow/tee.
Tee used in the vent/flue termination must be included when determining
the number of elbows in the piping system.
2 1/2” or 3” diameter pipe can be used in place of 2” diameter pipe.
Increased Clearance Configurations using (2) 45 deg. Long Sweep elbows
should be considered equivalent to one 90 deg. elbow.
One 90° elbow should be secured to the combustion air intake connection.
VENT/FLUE PIPE TERMINATIONS
BE SURE NOT TO DAMAGE INTERNAL WIRING OR OTHER COMPONENTS
WHEN REINSTALLING COUPLING AND SCREWS.
NOTE: If either a 90 degree or 45 degree elbow is used for
termination, it must be pointed downward.
NON-DIRECT VENT (SINGLE PIPE) PIPING
The vent/flue pipe may terminate vertically, as through a roof,
or horizontally, as through an outside wall.
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.
Vertical vent/flue pipe terminations should be as shown in the
following figure. Refer to 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.
Horizontal vent/flue pipe terminations should be as shown in the
following figure. Refer to Vent/Flue Pipe and Combustion Air
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.
Although non-direct vent installations do not require a combustion air intake pipe, a minimum of one 90° elbow should 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.
VENT/FLUE PIPE LENGTHS
AND
DIAMETERS
NOTE: Terminate both pipes in the same pressure zone
(same side of roof, no major obstacles between pipes,
etc.).
NOTE: If either a 90 degree or 45 degree elbow is used for
termination, it must be pointed downward.
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 should be secured to the combustion air intake
14
DOWN VENTING UPFLOW MODEL FURNACES ONLY
Figure 11
Use alternate vent
& combination air locations
Vent Pipe
r
Floo
Combustion Air Pipe
To Field Supplied
Condensate Disposal
ce
lspa
w
a
/ Cr
t
men
e
s
a
B
ot min.
Slope 1/4” per fo
Field Supplied
Drain Tee on Vent Pipe
Condensate trapped
to previent flue gas from escaping
All piping and fittings must be joined per material manufacturer’s specifications
to prevent separation and flue gas leaks.
TEE (OPTIONAL)
COMBUSTION AIR INTAKE
(OPTIONAL)
12” MIN
HEIGHT DIFFERENCE
BETWEEN
INTAKE AND VENT
*Not required for
single pipe installation
RO
OF
LIN
ELBOWS
STRAIGHT
Figure 13
E
INTAKE
SCREEN
OPTIONAL
X.
MA
”
96
”
-3
MI
N.
12” MIN TO ROOF OR HIGHEST
ANTICIPATED SNOW LEVEL
Figures 12
15
VENT/FLUE
12" MIN.
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.
VENT/FLUE TEE (OPTIONAL)
or
45° ELBOW
TURNED DOWN or
90° ELBOW TURNED
DOWN
Vertical pipe terminations should be as shown in the following
figure. Refer to 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.
12" MIN. ABOVE
HIGHEST ANTICIPATED
SNOW LEVEL
10”- 24”
6” MAX
Horizontal Termination (Single Pipe)
Above Highest Anticipated Snow Level
Figure 14
4” MIN
DIRECT VENT (DUAL PIPE) PIPING
90º OR 45°
ELBOW
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. Installation of screens, while strongly recommended, is not required and will not affect performance of the
unit.
SCREEN
(OPTIONAL)
12" MIN. TO GRADE OR
HIGHEST ANTICIPATED
SNOW LEVEL
Standard Horizontal Terminations (Dual Pipe)
Figure 15
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 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 Vent/Flue Pipe
and Combustion Pipe - Standard Furnace Connections or Alternate Furnace Connections.
Vent & Combustion Air Intake Measurements for Standard
Horizontal Terminations (Dual Pipe)
Center to center = 10” min / 24” max.
Vertical separation: 0” - 24”
Vent termination from wall = 8” min / 12” max.
Combustion air intake from wall = 6” max.
Vent and intake clearance to ground
or anticipated snow level = 12” min.
90°
ELBOWS
VENT/FLUE & COMBUSTION AIR PIPE LENGTHS & 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.
3” - 24”
AIR
INTAKE
SCREEN
(OPTIONAL)
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.
12" MIN. ABOVE
HIGHEST ANTICIPATED
SNOW LEVEL
Alternate Horizontal Vent Termination (Dual Pipe)
Figure 16
16
CONCENTRIC VENT TERMINATION
90°
ELBOWS
Refer to the directions provided with the Concentric Vent Kit
(DCVK) for installation specifications.
SIDE WALL VENT KIT
3”-24” BETWEEN PIPES
H orizontal Installation
AIR
INTAKE
SCREEN
(OPTIONAL)
12" MIN. ABOVE
HIGHEST ANTICIPATED
SNOW LEVEL
Ve rtica l Installation
Side Wall Vent Kit
Figure 19
Combustion Air Intake may also be snorkeled to obtain 12” min ground
clearance.
This kit is to be used with 2” or 3” direct vent systems. The
vent kit must terminate outside the structure and may be installed with the intake and exhaust pipes located side-by-side or
with one pipe above the other. These kits are NOT intended for
use with single pipe (indirect vent) installations.
Alternate Vent Termination Above Anticipated Snow Level
(Dual Pipe)
Figure 17
VENT/INTAKE TERMINATIONS FOR INSTALLATION OF MULTIPLE
DIRECT VENT FURNACES
Refer to the directions furnished with the Side Wall Vent Kit
(p/n 0170K00000S or 0170K000001S) for installation specifications.
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.
CONDENSATE DRAIN LINES & DRAIN TRAP
A condensing gas furnace achieves its high level of efficiency by
extracting heat from the products of combustion to the point
where condensation takes place. The condensate must be collected in the furnace drain trap and routed to an appropriate
drain location in compliance with local and national codes.
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.
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.
•
The drain trap supplied with the furnace must be
used.
•
The drain trap must be primed at time of
installation.
•
The drain line between furnace and drain location
must meet local and nation codes.
•
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.
•
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.
3”MIN
24”MAX
12” MIN SEPARATION
3” MIN
OPTIONAL
INTAKE
SCREENS
12” MIN TO GRADE OR HIGHEST
ANTICIPATED SNOW LEVEL
Termination of Multiple Direct Vent Furnaces
Figure 18
17
UPFLOW MODEL INSTALLED VERTICALLY
NOTE: In vertical installations, air conditioning coil condensate may drain into the furnace trap as long as there is a
trap between the coil and the furnace trap and the drain pipe
is not terminating below the water level of the furnace trap.
The trap and factory installed hoses remain as shipped. The
furnace drain may exit either the right or left side of the
furnace cabinet.
GENERAL DRAIN INFORMATION
All furnace models come with a factory installed drain trap.
For vertical installations, the trap will remain in the factory
position except for a counterflow when the installer desires
the drain to exit the right side. All furnace models installed
horizontally require the trap to be relocated. Many drain hoses
have a built–in grommet which will provide a cabinet seal
when installed. See instructions below for your model and
installation position. NOTE: Both sides of the drain trap
must be primed prior to initial furnace start up
Hose #1
Hose #2
FIELD SUPPLIED DRAIN
Drain the furnace and air conditioning coil if applicable, in
compliance with code requirements. In horizontal or
counterflow installations, a field installed rubber coupling
will allow the drain trap to be removed for cleaning. The
drain trap must be primed before initial furnace start up.
When an air conditioning coil drain is connected to the field
supplied furnace drain, it must be vented.
45 degree
barb-pipe
adapter
45 degree
barb-pipe
adapter
Installer selects right or left side drain
and installs this hose accordingly.
Figure 21
DRAIN EXITING RIGHT SIDE
#2
#1
1. Locate and Install the 45º pipe / hose drain coupling
from the outside of the cabinet (barbed end goes in
the cabinet) through hole in the right side of the cabinet
and secure with two field supplied #8 self-tapping
screws (see Figure 21).
2. Locate the long drain hose #3 and cut at line “A” .
3. Install large end of hose #3 to trap outlet and secure
with 1.25" clamp.
4. Install smaller end of hose #3 on 45º elbow and secure
with 1" clamp.
5. Refer to Field Supplied Drain section for instructions
on field supplied / installed drain on outlet of furnace
trap.
#3
#5
#4
#8
#7
DRAIN EXITING LEFT SIDE
1. Install the 45 degree pipe / hose drain coupling from
the outside of the cabinet (barbed end goes in the
cabinet) through the hole in the left side of the cabinet
and secure with two field supplied #8 self-tapping
screws (see Figure 21).
2. Locate the long drain hose #3 and cut at “B” line for a
17.5" cabinet; cut at line “C” for a 21" cabinet; do not
cut for a “D” width cabinet.
3. Install large end of hose #3 to trap outlet and secure
with 1.25" clamp.
#9
#10
#6
#11
Coupling
100 Degree
Elbow
Figure 20
NOTE: Hoses are model specific
and not all hoses will be shipped with all models.
18
4. Install smaller end of hose #3 on 45º elbow and secure
with 1" clamp.
5. Refer to Field Supplied Drain section for instructions
on field supplied / installed drain on outlet of furnace
trap.
UPFLOW MODEL INSTALLED HORIZONTALLY
DOWN
WITH
UPFLOW
MODEL INSTALLED HORIZONTALLY WITH LEFT SIDE
DOWN
Minimum 5 3/8" clearance is required for the drain trap beneath the furnace.
RIGHT SIDE
Minimum 5 3/8" clearance is required for the drain trap beneath the furnace.
Hose #6
Hose #5
Hose #11
Figure 23
Hose #11
1. Remove the clamps from the two drain tubes on the trap.
2. Remove the two screws holding the drain trap to the
blower deck.
3. Remove the trap and hoses from the blower deck .
4. Remove the two plugs from the left side of the cabinet
and install them in the blower deck.
5. (Draining the Vent Elbow) Locate hose #6. Measuring
from the non-grommet end; cut off and discard 1 ½” for
a “D” width cabinet, 5” for a “C” width cabinet, 8 ½”
for a “B” width cabinet.
6. Remove the rubber plug from vent – drain elbow side
port. Place hose #6 on the vent – drain elbow side port
and secure with a silver clamp .
7. Place cap on vent – drain elbow barb fitting and secure
with red clamp
8. Locate hose #5 and cut 3” from the non-grommet end.
Discard the section without the grommet.
9. Insert the cut end of tube #5 through the lower cabinet
drain hole.
10. Connect hose #6 & hose #5 using 100º elbow and secure
with two red clamps
11. (Draining the Collector Box) Install the non-grommet end
of hose #11 from outside the cabinet in the bottom drain
hole. Install on collector box and secure with a silver
clamp.
12. Use two silver clamps and secure the hoses to drain trap.
The trap outlet faces the front of the furnace. Secure
the trap to the cabinet using two screws removed in step
2 by inserting the two screws through the large set of
holes in the top mounting tabs of the trap into the two
predrilled holes in the side of the cabinet.
13. Place cap on vent – drain elbow barb fitting and secure
with red clamp.
14. Refer to Field Supplied Drain section for instructions on
field supplied / installed drain on outlet of furnace trap.
Hose #5-Cut at “C”
Figfure 22
1. Remove the clamps from both ends of the drain hoses.
2. Remove the two screws holding the drain trap to the
blower deck.
3. Remove the trap and two hoses from the blower deck
4. Remove the two plugs from the right side of the cabinet
and install them in the blower deck.
5. (Draining the Vent Elbow ) Locate hose #5 and cut it at
line “C”. Install the cut end of hose #5 from outside
the cabinet through the cabinet drain hole nearest the
top. Secure it to the barbed fitting in the elbow with a
red clamp.
6. (Draining the Collector Box) Install the non-grommet
end of hose #11 from outside the cabinet in the bottom
drain hole. Install on collector box and secure with a
silver clamp.
7. Use two silver clamps and secure the hoses to drain
trap. The trap outlet faces the front of the furnace.
Secure the trap to the cabinet using two screws
removed in step 2 by inserting the two screws through
the large set of holes in the top mounting tabs of the
trap into the two predrilled holes in the side of the
cabinet.
8. Refer to Field Supplied Drain section for instructions
on field supplied / installed drain on outlet of furnace
trap.
19
COUNTERFLOW MODEL INSTALLED VERTICALLY
3. (Draining the Vent Elbow) Insert the non-grommet end
hose #10 into the cabinet back drain hole. Secure on
vent – drain elbow barb fitting with a red clamp.
4. Insert 100º elbow into the cut end and secure with red
clamp.
5. (Draining the Collector Box) Insert non-grommet end
of hose #9 into the cabinet front drain hole and secure
on collector box drain port with a silver clamp.
6. Mate the drain trap inlets to the hoses and secure with
silver clamps.
7. Line up the trap mounting holes with the pre-drilled
holes in the furnace and secure with 2 screws removed
in step 2.
8. Refer to Field Supplied Drain section for instructions
on field supplied / installed drain on outlet of furnace
trap.
COUNTERFLOW MODEL INSTALLED HORIZONTALLY
RIGHT SIDE DOWN
WITH
Minimum 5 3/8" clearance is required for the drain trap
beneath the furnace.
Hose #5 x 2
Hose #4 x 2
Figure 24
The furnace drain may exit the right or left side of the furnace cabinet (left side preferred) Trap and factory installed
hoses remain as shipped if the drain will exit the left side of
the cabinet. Draining from the right side requires re-location of the trap to outside the cabinet.
DRAIN EXITING LEFT SIDE
1. Install a field supplied rubber coupling secured with a
1 1/4” clamp to enable removing the trap for future
cleaning. Alternately, a PVC fitting may be glued on
the trap outlet.
2. Install drain per local and National codes.
Drain Port
DRAIN EXITING RIGHT SIDE
Hose #8
Figure 26
Hose #7
1. Remove hose clamps and hoses from trap.
2. Remove trap.
3. (Draining the Collector Box) From outside the cabinet,
insert the non-grommet end hose #8 into the back drain
hole.
4. Secure to collector box drain port using a silver clamp.
5. (Draining the Vent Elbow) From outside the cabinet,
insert the non-grommet end of hose #7 into the front
cabinet drain hole and secure on the vent – drain
elbow barb fitting using a red clamp
6. Mate the trap inlets to the hoses, the outlet of the
trap must face the original bottom of the furnace.
Secure with silver clamps.
7. Fasten the drain trap to the cabinet with two screws
removed in step 2
8. Refer to Field Supplied Drain section for instructions
on field supplied / installed drain on outlet of furnace
trap.
Figure 25
1. Remove hose clamps and hoses from trap.
2. Remove trap.
20
COUNTERFLOW MODEL INSTALLED HORIZONTALLY
SIDE DOWN
WITH
17. Refer to Field Supplied Drain section for instructions on
field supplied / installed drain on outlet of furnace trap.
LEFT
ELECTRICAL CONNECTIONS
Minimum 5 3/8" clearance is required for the drain trap beneath the furnace.
Hose #4
WARNING
HIGH VOLTAGE !
TO AVOID THE RISK OF ELECTRICAL SHOCK, WIRING TO
THE UNIT MUST BE POLARIZED AND GROUNDED .
WARNING
HIGH VOLTAGE !
TO AVOID PERSONAL INJURY OR DEATH DUE TO
ELECTRICAL SHOCK, DISCONNECT ELECTRICAL POWER
BEFORE SERVICING OR CHANGING ANY ELECTRICAL
WIRING.
Hose #4
CAUTION
Hose #5 x2
LABEL ALL WIRES PRIOR TO DISCONNECTION WHEN SERVICING
CONTROLS . WIRING ERRORS CAN CAUSE IMPROPER AND DANGEROUS
OPERATION . VERIFY PROPER OPERATION AFTER SERVICING .
Figure 27
1. Remove hose clamps and hoses from trap.
2. Remove trap.
3. Remove plugs from left side of cabinet and install in
blower deck.
4. (Draining the Collector Box) Locate hose #4 and place
the radius end on the collector box drain port, secure
with a silver clamp.
5. Locate hose #2, insert from outside the cabinet in the
drain hole closest to the front of the cabinet, insert a
coupling and secure with a red clamp.
6. Mate coupling to hose #4 and secure with a red clamp.
7. (Draining the Vent Elbow) Remove plug from vent – drain
elbow side port.
8. Locate hose #4 and place radius end on the side port of
vent – drain elbow and secure with a red clamp.
9. Install cap on vent drain elbow barb fitting and secure
with red clamp.
10. Insert PVC pipe into hose #4 and secure with a red
clamp.
11. Locate hose #5, insert it from outside the cabinet in
the drain hole farthest from the front of the cabinet.
12. Insert 100º elbow in hose #5 and secure with a red
clamp.
13. Locate another hose #5 cut a 5.25" straight section
and discard the radius end.
14. Connect the 5.25’ straight section to the 100º elbow
and the PVC pipe and secure with red clamps.
15. Mate trap inlets and hoses and secure with silver
clamps, drain trap outlet must point to the original
bottom of the furnace.
16. Secure trap to furnace using two screws removed in
step 2.
WIRING HARNESS
The wiring harness is an integral part of this furnace. Wires
are color 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 a copper conductor.
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 NEC 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.
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.
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 air tight using either an UL approved bushing such as
Heyco Liquid Tight or by applying non-reactive UL approved
sealant to bushing.
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 right
21
side (left side for counterflows) electrical connection with the
junction box located inside the burner compartment. To make
electrical connections through the opposite side of the furnace, the junction box must be relocated to the other side of
the burner compartment prior to making electrical connections.
To relocate the junction box, follow the steps shown below.
use gas piping as an electrical ground. To confirm proper unit
grounding, turn off the electrical power and perform the following check.
1. Measure resistance between the neutral (white)
connection and one of the burners.
2. Resistance should measure 10 ohms or less.
NOTE: Wire routing must not to interfere with circulator blower
operation, filter removal, or routine maintenance.
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.
JUNCTION BOX RELOCATION
24 VOLT THERMOSTAT WIRING
WARNING
EDGES OF SHEET METAL HOLES MAY BE SHARP. USE GLOVES AS A
PRECAUTION WHEN REMOVING HOLE PLUGS .
IMPORTANT NOTE
WIRE ROUTING MUST NOT INTERFERE WITH CIRCULATOR BLOWER
OPERATION , FILTER REMOVAL OR ROUTINE MAINTENANCE .
A REMOVABLE PLUG CONNECTOR IS PROVIDED WITH THE CONTROL TO
MAKE THERMOSTAT WIRE CONNECTIONS . THIS PLUG MAY BE REMOVED ,
WIRE CONNECTIONS MADE TO THE PLUG, AND REPLACED . IT IS
STRONGLY RECOMMENDED THAT YOU DO NOT CONNECT MULTIPLE
WIRES INTO A SINGLE TERMINAL. WIRE NUTS ARE RECOMMENDED TO
ENSURE ONE 18 AWG WIRE IS USED FOR EACH TERMINAL . FAILURE TO
DO SO MAY RESULT IN INTERMITTENT OPERATION .
WARNING
TO PREVENT PERSONAL INJURY OR DEATH DUE TO ELECTRIC SHOCK,
DISCONNECT ELECTRICAL POWER BEFORE INSTALLING OR SERVICING THIS
UNIT.
WARNING
HIGH VOLTAGE !
As a two-stage non-communicating furnace, the furnace integrated control module provides terminals for both “W1” and
“W2”, and “Y1” and “Y2” thermostat connections. This allows
the furnace to support the following system applications: ‘TwoStage Heating Only’, ‘Two-Stage Heating with Single Stage Cooling’, and ‘Two-Stage Heating with Two-Stage Cooling’. Refer to
the following figures for proper connections to the integrated
control module.
TO AVOID THE RISK OF INJURY, ELECTRICAL SHOCK 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 C ODE.
Line voltage connections can be made through either the
right or left side panel. The furnace is shipped conigured
for a right side electrical connection. To make electrical
connections through the opposite side of the furnace, the
junction box must be relocated to the left side prior to making electrical connections. To relocate the juntion box, perform the following steps.
Low voltage connections can be made through either the right
or left side panel. Thermostat wiring entrance holes are located
in the blower compartment. The following figure shows connections for a “heat/cool system”.
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.
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: For single stage cooling applications, a jumper may be
required between Y1 and Y2 at the furnace control in order to
achieve the desired single stage cooling airflow. Use of ramping profiles and dehumidification features require a jumper
between Y1 and O.
WARNING
NOTE: Thermostat “R” required if outdoor unit is equipped with
a Comfort Alert™ module or if the out door unit is a part of the
ComfortNet™™ family of equipment AND is wired as a noncommunicating system.
TO AVOID THE RISK OF INJURY, ELECTRICAL SHOCK OR DEATH, THE
FURNACE MUST BE ELECTRICALLY GROUNDED IN ACCORDANCE WITH
LOCAL CODES OR , IN THEIR ABSENCE , WITH THE LATEST EDITION OF THE
NATIONAL E LECTRICAL CODE.
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
22
To use a single-stage thermostat, turn off power to the furnace, move the thermostat selection DIP switch to the OFF
position. Set the desired transition time by setting the transition delay DIP switch to the desired ON/OFF position. Turn
power back on. Refer to the following figure.
R
Furnace Integrated
Control Module
R
NEU
Y
C
Dehumidistat
[Optional]
Remote
Condensing Unit
(Single-Stage Cooling)
OFF
ON
Move to the ON position
to select two-stage
thermostat or OFF to
select single stage
thermostat
Heat OFF Delay
DIP Switches
NOTE: To apply a single-stage Heating Thermostat, the thermostat
selector switch on the Integrated Control Module must be set
on single-stage.
Figure 28
3
Thermostat
4
Stage Delay
If 3 is ON, #4 is ignored.
Move to the ON position
to select Auto transition
delay or OFF for 5 minute
transition delay
S1
Thermostat - Single -Stage Heating with Single-Stage Cooling
Figure 31
24 VOLT DEHUMIDISTAT WIRING
R
Y
The optional usage of a dehumidistat allows the furnace’s circulator blower to operate at a slightly lower speed (85% of desired
speed) during a combined thermostat call for cooling and dehumidistat call for dehumidification. This can be done through an
independent dehumidistat or through a thermostat’s DEHUM terminal (if available). This lower blower speed enhances dehumidification of the conditioned air as it passes through the AC coil.
For proper function, a dehumidistat applied to this furnace must
operate on 24 VAC and utilize a switch which opens on humidity
rise. Refer to the “Thermostat Wiring Diagrams” figure for
additional wiring details.
Furnace Integrated
Control Module
R
C
NEU
Remote
Condensing Unit
(Single-Stage Cooling)
Dehumidistat
[Optional]
Thermostat - Two-Stage Heating with Single-Stage Cooling
Figure 29
Y2
Y2
Y2
W1
W1
W2
W2
To install/connect a dehumidistat:
1. Turn OFF power to furnace.
2. To enable the dehumidify function on the integrated control
module, set the dehumidification ENABLE dip switch from
OFF to ON.
3. Secure the dehumidistat neutral wire (typically the white
lead) to the terminal marked “DEHUM” on the furnace
integrated control module.
4. Secure the dehumidistat hot wire (typically the black lead)
to the terminal marked “R” on the furnace integrated
control module.
5. Secure the dehumidistat ground wire (typically the green
lead) to the ground screw on the furnace junction box.
NOTE: Ground wire may not be present on all
dehumidistats.
6. Turn ON power to furnace.
Furnace Integrated
Control Module
NEU
Dehumidistat
[Optional]
Remote
Condensing Unit
(Two-Stage Cooling)
Thermostat - Two-Stage Heating with Two-Stage Cooling
Thermostat Wiring Diagrams
Figure 30
SINGLE-STAGE HEATING THERMOSTAT APPLICATION
A single-stage thermostat with only one heating stage may
be used to control this furnace. The application of a singlestage thermostat offers a timed transition from low to high
fire. The furnace will run on low stage for a fixed period of
time before stepping up to high stage to satisfy the
thermostat’s call for heat. The delay period prior to stepping up can be set at either a fixed 5 minute time delay or a
load based variable time between 1 and 12 minutes (AUTO
mode). If the AUTO mode is selected, the control averages
the cycle times of the previous three cycles and uses the
average to determine the time to transition from low stage
to high stage.
Once the switch is set, the dehumidify function is enabled during
a combination call for cooling (T-Stat) and dehumidification
(DEHUM-Stat).
OFF ON
Move to the ON position
to enable dehumidification.
1
DEHUM
2
TRIM ENABLE
S5
Select ON to enable
trim selected by S3 3 & 4.
Figure 32
23
FOSSIL FUEL APPLICATIONS
This furnace can be used in conjunction with a heat pump in a
fossil fuel application. A fossil fuel application refers to a combined gas furnace and heat pump installation which uses an outdoor temperature sensor to determine the most cost efficient
means of heating (heat pump or gas furnace).
A heat pump thermostat with three stages of heat is required to
properly use a two-stage furnace in conjunction with a heat pump.
Refer to the fossil fuel kit installation instructions for additional
thermostat requirements.
Strictly follow the wiring guidelines in the fossil fuel kit installation instructions. All furnace connections must be made to the
furnace two-stage integrated control module and the “FURNACE”
terminal strip on the fossil fuel control board.
115 VOLT LINE CONNECTION OF ACCESSORIES (HUMIDIFIER AND
ELECTRONIC AIR CLEANER)
Accessories Wiring
Figure 32
WARNING
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.
HIGH VOLTAGE !
TO AVOID PERSONAL INJURY OR DEATH DUE TO
ELECTRICAL SHOCK, DISCONNECT ELECTRICAL POWER
BEFORE SERVICING OR CHANGING ANY ELECTRICAL
WIRING.
The integrated control module single humidifier terminal (HUM)
is 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. This terminal can also be used to
provide 115 volt power to a humidifier transformer. The remaining primary transformer wire would be connected to the
Line N on the control board.
The furnace integrated control module is equipped with line voltage accessory terminals for controlling power to an optional fieldsupplied humidifier and/or electronic air cleaner.
The accessory load specifications are as follows:
Humidifier
Electronic Air Cleaner
1.0 Amp maximum at 120 VAC
1.0 Amp maximum at 120 VAC
In addition, the control is equipped with a dedicated humidification relay which is available through ¼ inch terminals
HUM-IN and HUM-OUT. Similar to the HUM terminal, when
utilizing legacy connections, this relay will be closed during
normal heating operation. HUM IN must be powered with
the desired voltage (24 vac from the R terminal or 115 vac
from L1 terminal). The internal relay will close during a call
for heat. Also, the control can provide additional humidification features when wired to a communicating thermostat
(1, 2, R, C connections). If the communicating thermostat
is not capable of providing a humidification call, this dedicated relay will function exactly as mentioned above with a
legacy setup. If the communicating thermostat is capable of
providing a humidification call the user is now provided with
3 modes of operations which can be selected within the thermostat user menu.
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
terminals are identified as HUM and EAC. The humidifier and
electronic air cleaner neutral terminals are identified as NEUTRAL. All field wiring must conform to applicable codes. Connections should be made as shown.
1. ON: Humidifier is turned on with a heat demand.
2. OFF: Humidifier remains off (relay never closes).
3. IND: Humidifier will cycle with humidification demand,
independent of heat demand. This mode allows the user
to select one of 4 fan speeds (25, 50, 75, and 100%).
24
HUM-IN
HUM-OUT
NEUTRAL
Inlet gas supply pressures must be maintained within the ranges
specified in the following table. 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.
INLET GAS SUPPLY PRESSURE
24 VOLT
COMMON
Minimum: 4.5" w.c.
Maximum: 10.0" w.c.
Propane Gas
Minimum: 11.0" w.c.
Maximum: 13.0" w.c.
HIGH ALTITUDE DERATE
HUM-IN
HUM-OUT
Figure 33A
Natural Gas
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.
High altitude kits are purchased according to the installation
altitude and usage of either natural or propane gas. Consult
the furnace Specification Sheet for appropriate kits.
Figure 33B
AUXILIARY ALARM SWITCH:
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.
The control is equipped with a 24VAC Auxiliary Alarm Input
(12 inch purple / white wire attached to pin 6 of 15 pin
connector) which can be utilized with communicating mode
setups (typically used for condensate switch wiring but could
be used with compatible C02 sensors or Fire Alarms).
Legacy mode use
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.
In a legacy system (Non-communicating), this auxiliary alarm
input is not operational. Any auxiliary alarm switch must be
used to interrupt Y1 signal either to IFC or to UC.
Communication mode use
This feature can be activated or deactivated through the
thermostat user menus. By default, an AUX switch is normally closed and opens when the water level in the evaporator coil base pan reaches a particular level. The control will
respond by turning off the outdoor compressor and display
the proper fault codes. If the AUX switch is detected closed
for 30 seconds, normal operation resumes and error messages are no longer displayed. Installer must wire control
voltage (24VAC) to AUX switch to ensure the Auxiliary Alarm
Input has 24VAC during normal operation.
A different pressure switch may be required at high altitude
regardless of the BTU/ft3 content of the fuel used. Consult the
furnace Specification Sheet for pressure switch.
PROPANE GAS CONVERSION
WARNING
POSSIBLE PROPERTY DAMAGE , PERSONAL INJURY OR DEATH MAY
OCCUR IF THE CORRECT CONVERSION KITS ARE NOT INSTALLED . THE
GAS SUPPLY AND PIPING
APPROPRIATE KITS MUST BE APPLIED TO ENSURE SAFE AND PROPER
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.
QUALIFIED INSTALLER OR SERVICE AGENCY.
FURNACE OPERATION .
ALL CONVERSIONS MUST BE PERFORMED BY A
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 for details.
CAUTION
Consult the furnace Specification Sheet for a listing of appropriate kits. 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.
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.
25
• Use black iron or steel pipe and fittings for building piping.
GAS VALVE
Where possible, use new pipe that is properly chamfered,
reamed, and free of burrs and chips. If old pipe is used,
be sure it is clean and free of rust, scale, burrs, chips,
and old pipe joint compound.
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.
• Use pipe joint compound on male threads ONLY. Always
use pipe joint compound (pipe dope) that is APPROVED
FOR ALL GASSES. DO NOT apply compound to the first
two threads.
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 Startup Procedure
& Adjustment for use of this control during start up and shut
down periods.
• Use ground joint unions.
• Install a drip leg to trap dirt and moisture before it can
•
GAS PIPING CONNECTIONS
WARNING
• Always use a back-up wrench when making the connection
TO AVOID POSSIBLE UNSATISFACTORY OPERATION OF EQUIPMENT
DAMAGE DUE TO UNDERFIRING OR EQUIPMENT, USE THE PROPER SIZE
OF NATURAL /PROPANE GAS PIPING NEEDED WHEN RUNNING PIPE FROM
THE METER /TANK TO THE FURNACE.
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.
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)
•
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. Maximum torque for the gas
valve connection is 375 in-lbs; excessive over-tightening
may damage the gas valve.
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:
1 1/2"
1600
1100
980
760
670
610
560
530
490
460
–
–
•
CFH = BTUH Furnace Input
Heating Value of Gas (BTU/Cubic Foot)
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 aluminumalloy 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.
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.
The following stipulations apply when connecting gas piping. Refer to Gas Piping Connections figure for typical gas line connections to the furnace.
•
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.
Gas piping must be supported external to the furnace
cabinet so that the weight of the gas line does not
distort the burner rack, manifold or gas valve.
26
Alternate
Gas Line
Location
Manifold
Burners
Gas Valve
Manual Shut Off Valve
(upstream from
ground joint
pipe union)
*Ground
Joint
Pipe
Union
*Ground
Joint
Pipe
Union
Alternate
Union
Location
Grommet in
Standard Gas Line Hole
Manual Shut Off Valve
(upstream from
ground joint pipe union)
Drip Leg
Plug in Alternate Gas Line Hole
Drip Leg
Grommet
in Standard
Gas Line
Hole
Burners
*NOTE: Union may be inside furnace cabinet where allowed by local codes.
UPFLOW
Figure 34
Manifold
Manual Shut Off Valve
(upstream from ground joint pipe union)
UPFLOW - HORIZONTAL LEFT
Figure 36
*Ground
Joint
Pipe Union
Grommet
in Standard
Gas Line
Hole
Manual Shut Off Valve
(upstream from
ground joint
pipe union)
Plug in
Alternate
Gas Line
Hole
Drip Leg
Plug in Main Gas Line Hole
Drain Trap
Alternate
Gas Line
Location
*Ground
Joint
Pipe Union
Gas
Valve
Gas Valve
Burners
*NOTE: Union may be inside furnace cabinet where allowed by local codes.
COUNTERFLOW
Figure 35
COUNTERFLOW - HORIZONTAL RIGHT
Figure 37
Gas Piping Connections
The gas piping may enter the left or right side of the furnace
cabinet. The installer must supply rigid pipe 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. 1/2” NPT pipe and fittings
27
are required. For models with an “L” shaped manifold, a 4
1/2” long nipple is required. For models with a hook shaped
manifold, a 2” long nipple is required.
For satisfactory operation, propane gas pressure must be 10”
WC 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.
A semi-rigid connector to the gas piping can be used outside the cabinet per local codes. From the elbow, the length
of pipe and the fittings required will vary by the side chosen, location of union and cabinet width. The union may be
placed inside or outside of the cabinet.
GAS PIPING CHECKS
Before placing unit in operation, leak test the unit and gas connections.
Complete information regarding tank sizing for vaporization,
recommended regulator settings, and pipe sizing is available
from most regulator manufacturers and propane gas suppliers.
WARNING
TO AVOID THE POSSIBILITY OF EXPLOSION OR FIRE, NEVER USE A MATCH
OR OPEN FLAME TO TEST FOR LEAKS.
Since propane gas will quickly dissolve white lead and most standard commercial compounds, special pipe dope must be used.
Always use a pipe thread sealant approved for all gases.
Check for leaks using an approved chloride-free soap and water
solution, an electronic combustible gas detector, or other approved testing methods.
Refer to the following illustration for typical propane gas installations and piping.
NOTE: Never exceed specified pressures for testing. Higher
pressure may damage the gas valve and cause subsequent
overfiring, resulting in heat exchanger failure.
5 to 15 PSIG
(20 PSIG Max.)
First Stage
Regulator
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).
200 PSIG
Maximum
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).
Continuous
11" W.C.
Second Stage
Regulator
Propane Gas Installation (Typ.)
Figure 38
PROPANE GAS TANKS AND PIPING
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.
WARNING
IF THE GAS FURNACE IS INSTALLED IN A BASEMENT , AN EXCAVATED
AREA OR CONFINED SPACE , IT IS STRONGLY RECOMMENDED TO
Pipe or
Tubing
Length
Feet
CONTACT A PROPANE SUPPLIER TO INSTALL A GAS DETECTING WARNING
10
20
30
40
50
60
80
100
125
150
175
200
DEVICE IN CASE OF A GAS LEAK.
• SINCE PROPANE GAS IS HEAVIER THAN AIR , ANY LEAKING GAS CAN
SETTLE IN ANY LOW AREAS OR CONFINED SPACES.
• PROPANE GAS ODORANT MAY FADE , MAKING THE GAS UNDETECTABLE
EXCEPT WITH A 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 listed in the Safety Precautions section of this manual.
Nominal Pipe Size
Schedule 40
Tubing Size, O.D. Type L
3/8"
730
500
400
370
330
300
260
220
200
190
170
160
1/2"
1,700
1,100
920
850
770
700
610
540
490
430
400
380
5/8"
3,200
220
2,000
1,700
1,500
1,300
1,200
1,000
900
830
780
730
3/4"
5,300
3,700
2,900
2,700
2,400
2,200
1,900
1,700
1,400
1,300
1,200
1,100
7/8"
8,300
5,800
4,700
4,100
3,700
3,300
2,900
2,600
2,300
2,100
1,900
1,800
1/2"
3,200
2,200
1,800
1,600
1,500
1,300
1,200
1,000
900
830
770
720
3/4"
7,500
4,200
4,000
3,700
3,400
3,100
2,600
2,300
2,100
1,900
1,700
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
Propane Gas Piping Chart I
Sizing Between Second or Second Stage Regulator & Appliance*
All propane gas equipment must conform to the safety standards of the National Board of Fire Underwriters, NBFU Manual
58.
Maximum Propane Capacities listed are based on 1/2” W.C. pressure drop at 11” W.C. setting.
Capacities in 1,000 BTU/hour.
28
Pipe or
Tu bin g
Lengt h
Feet
3/8"
1/2"
5/8"
3/4"
7 /8"
1/2"
3/4"
10
20
39
26
92
62
199
131
3 29
2 16
501
346
275
189
567
393
30
40
50
21
19
18
50
41
37
107
90
79
1 81
1 45
1 31
277
233
198
152
129
114
315
267
237
590
504
448
1,212
1,039
913
1,858
1,559
1,417
60
80
16
13
35
29
72
62
1 21
1 04
187
155
103
89
217
185
409
346
834
724
1,275
1,066
100
125
150
11
10
9
26
24
21
55
48
43
90
81
72
138
122
109
78
69
63
162
146
132
307
275
252
630
567
511
976
866
787
200
8
19
39
66
100
250
8
17
36
60
93
*Data in accor dance wit h NFPA pamphlet No. 54
54
48
112
100
209
185
439
390
665
590
Too much external static pressure will result in insufficient
air that can cause excessive temperature rise. This can cause
limit switch tripping and heat exchanger failure.
Nom inal Pipe Size
Schedu le 40
Tub ing Size, O.D. Type L
1"
1- 1/4" 1-1/2"
1,07 1 2,205
732 1,496
3,307
2,299
To determine total external duct static pressure, proceed as
follows;
1. With clean filters in the furnace, use a draft gauge (inclined manometer) to measure the static pressure of the
return duct at the inlet of the furnace. (Negative Pressure)
2. Measure the static pressure of the supply duct. (Positive
Pressure)
Propane Gas Piping Chart II
3. The difference between the two numbers is .4” w.c.
CIRCULATING AIR & FILTERS
Example:
DUCT WORK - AIR FLOW
static reading from return duct = -.1" w.c.
static reading from supply duct = .3" w.c.
WARNING
NEVER ALLOW THE PRODUCTS OF COMBUSTION, INCLUDING CARBON
MONOXIDE, TO ENTER THE RETURN DUCT WORK OR CIRCULATION AIR
SUPPLY.
total external static pressure on this system = .4" w.c.
NOTE: Both readings may be taken simultaneously and read
directly on the manometer if so desired. If an air conditioner
coil or Electronic Air Cleaner is used in conjunction with the
furnace, the readings must also include theses components,
as shown in the following drawing.
Duct systems and register sizes must be properly designed for
the CFM and external static pressure rating of the furnace. Design the ductwork in accordance with the recommended methods of “Air Conditioning Contractors of America” Manual D.
4. Consult proper tables for the quantity of air.
Install the duct system 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.
If the total external static pressure exceeds the maximum
listed on the furnace rating plate, check for closed dampers,
registers, undersized and/or oversized poorly laid out duct
work.
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. For upflow installations requiring 1800 CFM or more, use either two side returns or bottom
return or a combination of side /bottom. Flexible joints may be
used for supply and return connections 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. Never use a
room, closet, or alcove as a return air chamber.
The temperature rise of the furnace must be within the temperature rise range listed on the furnace rating plate.
CHECKING DUCT STATIC
Refer to your furnace rating plate for the maximum ESP (external duct static) rating.
Total external static refers to everything external to the furnace cabinet. Cooling coils, filters, ducts, grilles, registers
must all be considered when reading your total external static
pressure. The supply duct pressure must be read between
the furnace and the cooling coil. This reading is usually taken
by removing the “A” shaped block off plate from the end on
the coil; drilling a test hole in it and reinstalling the block off
plate. Take a duct static reading at the test hole. Tape up
the test hole after your test is complete. The negative pressure must be read between the filter and the furnace blower.
Checking Static Pressure
(80% Furnace Shown, 90% Similar)
Figure 39
29
BOTTOM RETURN AIR OPENING [UPFLOW MODELS]
nace, but must be provided, sized and installed externally by the
installer. Filters must comply with UL900 or CAN/ULCS111 standards. If the furnace is installed without filters, the warranty will
be voided.
The bottom return air opening on upflow models utilizes a “lance
and cut” method to remove sheet metal from the duct opening
in the base pan. To remove, simply press out the lanced sections
by hand to expose the metal strips retaining the sheet metal
over the duct opening. Using tin snips, cut the metal strips and
remove the sheet metal covering the duct opening. In the corners of the opening, cut the sheet metal along the scribe lines to
free the duct flanges. Using the scribe line along the duct flange
as a guide, unfold the duct flanges around the perimeter of the
opening using a pair of seamer pliers or seamer tongs. NOTE:
Airflow area will be reduced by approximately 18% if duct flanges
are not unfolded. This could cause performance issues and noise
issues.
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.
Refer to the following table to determine filter area requirements.
Filter Sizing Chart
Model
Minimum Filter Size
*MVC960403BN**
20 X 24
*MVC960603BN**
20 X 25
EDGES OF SHEET METAL HOLES MAY BE SHARP. USE GLOVES AS A
*MVC960803BN**
18 X 36
PRECAUTION WHEN REMOVING SHEET METAL FROM RETURN AIR
*MVC960804CN**
24 x 30
OPENINGS.
*MVC961005CN**
24 X 36
*MVC961205DN**
2 (20 X 25)
*CVC960403BN**
20 X 24
*CVC960603BN**
20 X 25
*CVC960804CN**
18 X 36
*CVC961005CN**
24 x 30
*CVC961205DN**
2 (20 X 25)
WARNING
CUT USING TIN SNIPS
PRESS OUT BY HAND
CUT FOUR CORNERS
AFTER REMOVING SHEET
METAL
[Based on 300 ft/min filter face velocity]
Change filters before occupants take ownership of a new
home!
SCRIBE LINES OUTLINING
DUCT FLANGES
Duct Flange Cut Outs
Figure 40
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.
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.
The following figure shows possible filter locations.
AIR FLOW
CENTRAL
RETURN
GRILLE
SIDE RETURN
EXTERNAL FILTER
RACK KIT
(EITHER SIDE)
FILTER
FILTER
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.
FILTERS - READ THIS SECTION BEFORE INSTALLING THE RETURN
AIR DUCT WORK
Possible Upright Upflow
Figure 41
Filters must be used with this furnace. Discuss filter maintenance with the building owner. Filters do not ship with this fur30
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 Safety Instructions on page 5 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 shutoff 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.
FI
LT
E
ER
LT
FI
R
FILTER
ACCESS
DOOR
RETURN
DUCT
CENTRAL
RETURN
GRILLE
FILTER
SUPPORT
BRACKET
(Field Supplied)
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 120, 150, 180 or 210-second
delay period (field selectable delay OFF [90, 120, 150, 180]
plus 30-second ramp down), the circulator blower deenergizes.
2. Remove the burner compartment door and move the furnace
gas valve manual control to the OFF position.
3. Close the manual gas shutoff valve external to the furnace.
4. Replace the burner compartment door.
AIR FLOW
Possible Upright Counterflow
Filter Locations
Figure 42
HORIZONTAL INSTALLATIONS
Filters must be installed in either the central return register or in
the return air duct work.
STARTUP PROCEDURE & ADJUSTMENT
GAS SUPPLY PRESSURE MEASUREMENT
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 Operational Checks section.
GAS PRESSURE TEST
This test is to be used for field test mode only, and it will
allow gas valve pressure to be checked at 100% firing rate.
1. If both ‘FAULT RECALL’ and ‘LEARN’ push buttons are
pressed for greater than 1 second, the display will blank
to indicate the push buttons are pressed. Within 5 seconds, both push buttons should be released. If any push
button is not released, the test mode will not activate.
The display will return to normal.
DRAIN TRAP PRIMING
The drain trap MUST be primed prior to furnace startup. To
prime, fill both sides of the drain trap with water. This ensures
proper furnace drainage upon startup and prohibits the possibility of flue gases escaping through the drain system.
FURNACE OPERATION
2. Once the push buttons are released, the display will flash
“Ft” to indicate the push buttons are released and successful entry into test mode has been achieved.
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.
3. The control will force a high capacity demand. If a low
capacity demand is already being serviced, it will be forced
to high capacity.
FURNACE STARTUP
4. The display will continue to flash “Ft” until high capacity
(100%) is achieved. Once achieved, the display will show
“Ft” without flashing. A 5-minute timer will be started to
allow sufficient opportunity for the gas pressure to be
tested.
1.
2.
3.
4.
Close the manual gas shutoff valve external to the furnace.
Turn off the electrical power to the furnace.
Set the room thermostat to the lowest possible setting.
Remove the burner compartment door.
NOTE: This furnace is equipped with an ignition device which
automatically lights the burner. Do not try to light the burner by
hand.
5. If a call for heat is given or removed during the test, the
system will still operate until the 5 minute test time is
complete.
5. Move the furnace gas valve manual control to the OFF
position.
6. During test mode, if both push buttons are pressed for
greater than 1 second, the display will blank to indicate
push buttons are pressed. If both push buttons are re31
leased within 5 seconds, the test mode will terminate
and the system will return to normal operation. Otherwise, the test mode will continue uninterrupted.
Regulator
Vent
High Fire
Regulator
Adjust
7. After completion of the 5-minute timer or test mode termination, whichever is earlier, the system will return to
normal operation, either continuing an existing heat demand or going to the idle state.
CAUTION
Gas Valve On/Off
Selector Switch
TO PREVENT UNRELIABLE OPERATION OR EQUIPMENT DAMAGE , THE
Low Fire
Regulator
Adjust
INLET GAS SUPPLY PRESSURE MUST BE AS SPECIFIED ON THE UNIT
Honeywell Model VR9205 (Two-Stage)
Figure 44A
RATING PLATE WITH ALL OTHER HOUSEHOLD GAS FIRED APPLIANCES
OPERATING.
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.
Open to
Atmosphere
Common
Terminal(C)
Manometer
Hose
High Fire Coil
Terminal (HI)
Low Fire Coil
Terminal (LO)
i
Inlet Pressure Tap
1/8 NPT
INLET
OUTLET
Manometer
Honeywell Model VR9205 Connected to Manometer
Figure 44B
Gas Valve On/Off
Selector Switch
White-Rodgers Model 36J54 (Two-Stage)
Figure 43A
Open to
Atmosphere
Manometer
Hose
Outlet
Pressure Boss
Inlet
Pressure
Boss
Manometer
Outlet Pressure Tap
1/8 NPT
High Fire Regulator
Adjust
Regulator
Vent
Figure 44C
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. See Honeywell VR9205 gas
valve figure or White-Rodgers 36J54 gas valve figure for
location of inlet pressure tap.
Low Fire
Regulator
Adjust
NOTE: If measuring gas pressure at the drip leg or Honeywell
VR9205 gas valve, a field-supplied hose barb fitting must be
installed prior to making the hose connection. If using the inlet
pressure tap on the White-Rodgers 36J54 gas valve, then use
the 36G/J Valve Pressure Check Kit, Part No. 0151K00000S.
High Fire Coil
Coaxial Coil
Terminal (HI)
Terminal (M)
Common
On/Off Switch
Terminal(C)
White-Rodgers Model 36J54 Connected to Manometer
Figure 43B
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
Inlet Gas Supply Pressure table.
32
5. Turn ON the gas supply.
6. Turn on power and close thermostat “R” and “W1” contacts
to provide a call for low stage heat.
7. Measure the gas manifold pressure with burners firing.
Adjust manifold pressure using the Manifold Gas Pressure
table shown below.
8. Remove regulator cover screw from the low (LO) outlet
pressure regulator adjust tower and turn screw clockwise
to increase pressure or counterclockwise to decrease
pressure. Replace regulator cover screw.
9. Close thermostat “R” and “W2” contacts to provide a call
for high stage heat.
10. Remove regulator cover screw from the high (HI) outlet
pressure regulator adjust tower and turn screw clockwise
to increase pressure or counterclockwise to decrease
pressure. Replace regulator cover screw.
11. Turn off all electrical power and gas supply to the system.
12. Remove the manometer hose from the hose barb fitting
or outlet pressure tap.
13. Replace outlet pressure tap:
a. Honeywell VR9205 valve: Remove the 1/8" NPT hose
barb fitting from the outlet pressure tap. Replace the
outlet pressure tap plug and seal with a high quality
thread sealer.
b. White-Rodgers 36J54 valve: Turn outlet pressure test
screw in to seal pressure port (clockwise, 7 in-lb
minimum).
14. Turn on electrical power and gas supply to the system.
15. Close thermostat contacts “R” and “W1/W2” to energize
the valve.
INLET GAS SUPPLY PRESSURE
Natural Gas
Minimum: 4.5" w.c.
Maximum: 10.0" w.c.
Propane Gas
Minimum: 11.0" w.c.
Maximum: 13.0" w.c.
If supply pressure differs from table, make the 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. Reinstall plug before turning on
gas to furnace.
6. Turn OFF any unnecessary gas appliances stated in step
3.
Gas Line
Gas
Shutoff
Valve
Gas Line
To Furnace
Open To
Atmosphere
Drip Leg Cap
With Fitting
Manometer Hose
Manometer
Measuring Inlet Gas Pressure (Alt. Method)
Figure 45
Using a leak detection solution or soap suds, check for leaks at
outlet pressure tap plug (Honeywell valve) or screw (White-Rodgers valve). Bubbles forming indicate a leak. SHUT OFF GAS AND
REPAIR ALL LEAKS IMMEDIATELY!
NOTE: For gas to gas conversion, consult your dealer for
appropriate conversion.
GAS MANIFOLD PRESSURE MEASUREMENT AND ADJUSTMENT
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
M anifold Gas Pressure
Gas
Range
Natural
Low Stage 1.6 - 2.2" w .c.
High Stage 3.2 - 3.8" w .c.
Propane
Low Stage 5.7 - 6.3" w .c.
High Stage 9.7 - 10.3" w .c.
THE GAS VALVE PRESSURE REGULATOR .
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.
1. Turn OFF gas to furnace at the manual gas shutoff valve
external to the furnace.
2. Turn off all electrical power to the system.
3. Outlet pressure tap connections:
a. Honeywell VR9205 valve: Remove the outlet pressure
tap plug. Install an 1/8" NPT hose barb fitting into the
outlet pressure tap.
b. White-Rodgers 36J54 valve: Back outlet pressure test
screw (inlet/outlet pressure tap) out one turn
(counterclockwise, not more than one turn).
4. Attach a hose and manometer to the outlet pressure barb
fitting (Honeywell valve) or outlet pressure tap (WhiteRodgers valve).
Nom inal
1.9" w .c.
3.5" w .c.
6.0" w .c.
10.0" w .c.
GAS INPUT RATE MEASUREMENT (NATURAL GAS ONLY)
The actual 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 at high fire rate, time and
record one complete revolution of the gas meter dial,
measuring the smallest quantity, usually the dial that
indicates 1/2 cu. ft. per revolution. You will use this
number to calculate the quantity of gas in cubic ft. if
the furnace would consume if it ran steadily for one
hour (3600 seconds).
33
3. If the 1/2 cu. ft. dial was used, multiply your number
x 2.
EXAMPLE: If it took 23 seconds to complete one
revolution of the 1/2 ft. dial (23 x 2 = 46).
SUPPLY
AIR
This tells us that at this rate, it would take 46 seconds to
consume one cu. ft. of gas. 3600 / 46 = 78.
This tells us that in one hour, the furnace would consume 78
cu. ft. of gas.
The typical value range for 1 cu. ft. of natural gas is around
1000 BTU. Check with your gas utility, if possible. In this
example, the furnace is consuming 78,000 BTUH.
RETURN
AIR
NOTE: The final manifold pressure cannot vary by more
than ± 0.3” w.c. for Natural and + 0.5” for LP from
the specified setting. Consult your local gas supplier if
additional input rate adjustment is required.
4. 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.
Temperature Rise Measurement
Figure 46
CIRCULATOR BLOWER SPEEDS
TEMPERATURE RISE
WARNING
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
applicable to your model. 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.
TO AVOID PERSONAL INJURY OR DEATH DUE TO ELECTRICAL SHOCK,
TURN OFF POWER TO THE FURNACE BEFORE CHANGING SPEED TAPS .
This furnace is equipped with a multi-speed circulator blower.
This blower provides ease in adjusting blower speeds. The Specification Sheet applicable to your model 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 heating blower speed is shipped set at “B”,
and the cooling blower speed is set at “D”. These blower speeds
should be adjusted by the installer to match the installation requirements so as to provide the correct heating temperature
rise and correct cooling CFM.
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 Startup Procedure and Adjustment -Circulator Blower
Speeds for speed changing details.
Use the dual 7-segment LED display adjacent to the dip switches
to obtain the approximate airflow quantity. The airflow quantity
is displayed as a number on the display, rounded to the nearest
100 CFM. The display alternates airflow delivery indication and
the operating mode indication.
Example: The airflow being delivered is 1225 CFM. The display indicates 12. If the airflow being delivered is 1275, the
display indicates 13.
1. Determine the tonnage of the cooling system installed
with the furnace. If the cooling capacity is in BTU/hr divide
it by 12,000 to convert capacity to tons.
Example: Cooling Capacity of 30,000 BTU/hr.
30,000/12,000 = 2.5 Tons
2. Determine the proper air flow for the cooling system.
Most cooling systems are designed to work with air flows
between 350 and 450 CFM per ton. Most manufacturers
recommend an air flow of about 400 CFM per ton.
Example: 2.5 tons X 400 CFM per ton = 1000 CFM
34
The cooling system manufacturer’s instructions must be checked
for required air flow. Any electronic air cleaners or other devices
may require specific air flows, consult installation instructions of
those devices for requirements.
3. Knowing the furnace model, locate the high stage cooling
air flow charts in the Specification Sheet applicable to
your model. Look up the cooling air flow determined in
step 2 and find the required cooling speed and adjustment
setting.
Example: A *MVC960603B* furnace installed with a 2.5
ton air conditioning system. The air flow
needed is 1000 CFM. Looking at the cooling
speed chart for *MVC960603B*, find the air
flow closest to 1000 CFM. A cooling airflow of
1007 CFM can be attained by setting the
cooling speed to “C”.
4. Continuous fan speeds that provide 25, 50, 75 and
100% of the furnace’s maximum airflow capability are
selectable via dip switches S5- 3, 4.
Example: If the furnace’s maximum airflow capability
is 2000 CFM and 25% continuous fan speed
is selected, the continuous fan speed will
be 0.25 x 2000 CFM = 500 CFM.
5. Locate the blower speed selection DIP (S3) switches on
the integrated control module. Select the desired “cooling”
speed tap by positioning switches 1 and 2 appropriately.
Select the desired “adjust” tap by positioning switches 3
and 4 appropriately. To enable adjustments and select -5,
5, -10 or 10% trim, you must set dip switch S5-2 to
ON. If S5-2 is in the OFF position , you will receive 0%
trim. Refer to the following figure for switch positions
and their corresponding taps. Verify CFM by noting the
number displayed on the dual 7-segment LED display.
6. The multi-speed circulator blower also offers several custom
ON/OFF ramping profiles. These profiles may be used to
enhance cooling performance and increase comfort level.
The ramping profiles are selected using DIP switches S41, 2. Refer to the following figure for switch positions
and their corresponding taps. Refer to the following bullet
points for a description of each ramping profile. Verify
CFM by noting the number displayed on the dual 7-segment
LED display.
•
100% CFM
A*
B
C
100% CFM
OFF
OFF
1 min
Figure 47
•
Profile B ramps up to full cooling demand airflow by first
stepping up to 50% of the full demand for 30 seconds.
The motor then ramps to 100% of the required airflow. A
one (1) minute OFF delay at 100% of the cooling airflow is
provided.
100% CFM
100% CFM
50% CFM
OFF
OFF
1/2 min
1 min
Figure 48
•
Profile C ramps up to 85% of the full cooling demand airflow
and operates there for approximately 7 1/2 minutes. The
motor then steps up to the full demand airflow. Profile C
also has a one (1) minute 100% OFF delay.
100% CFM
OFF
OFF
Figure 49
Sw itch Bank : S3
Cooling Speed
Taps
DIP Sw itch No.
1
2
OFF
OFF
B
ON
OFF
C
OFF
ON
A
D*
ON
ON
(*Indicates f actory setting)
Switch Bank: S3
DIP Switch No.
Adjust Taps
3
4
+ 5%*
OFF
OFF
Switch Bank: S4
Ramping
Profiles
Profile A provides only an OFF delay of one (1) minute at
100% of the cooling demand airflow.
DIP Switch No.
1
2
- 5%
ON
OFF
OFF
OFF
+ 10%
OFF
ON
OFF
ON
- 10%
ON
ON
(*Indicates factory setting)
ON
OFF
D
ON
ON
(*Indicates factory setting)
NOTE: To enable adjustments and select -5, 5, -10 or 10%
trim, you must set dip switch S5-2 to ON. If S5-2 is in the
OFF position, you will receive 0% trim.
35
•
Profile D ramps up to 50% of the demand for 1/2 minute,
then ramps to 85% of the full cooling demand airflow and
operates there for approximately 7 1/2 minutes. The
motor then steps up to the full demand airflow. Profile D
has a 1/2 minute at 50% airflow OFF delay.
OFF
7. Select the heating speed for your model from the heating
speed chart in the Specification Sheet. The adjust setting
(already established by the cooling speed selection)
determines which set of speeds are available. The selected
speed must provide a temperature rise within the rise
range listed with the particular model.
Example: If the *MVC960804CN** is set for 1210 CFM
on cooling, the “ADJUST” is set to “+” (plus).
The four heating speeds available are “A
Plus”, “B Plus”, “C Plus”, and “D Plus”. “A
Plus” has a rise of 46°F for both stages which
is within the 30-60°F rise range for the
*MVC960804CN**. This setting will keep
electrical consumption to a minimum. Set
the “Heat” speed DIP switches to “A”.
OFF
Figure 50
M odel
Low
High
Low
High
Stage
Stage
Stage
Stage
Cool
Cool
Heat
Heat
D
403
527
675
803
398
557
696
810
403
540
705
819
513
660
791
913
564
784
982
1259
547
831
1020
1278
449
569
716
854
433
541
686
806
596
796
974
1192
599
817
1007
1212
629
806
1023
1230
789
967
1182
1375
820
1133
1464
1736
867
1160
1467
1910
655
807
998
1207
656
790
972
1195
422
471
521
574
667
740
808
881
855
923
1033
1063
867
939
1016
1077
1256
1292
1316
1358
1329
1362
1390
1440
682
750
820
888
687
751
814
874
494
553
601
676
953
1059
1158
1260
1202
1316
1389
1396
1228
1337
1430
1516
1818
1870
1910
1957
1891
1940
1968
2028
957
1059
1155
1251
938
950
986
992
A
405
624
758
1057
B
549
808
815
1146
C
678
994
882
1256
D
784
1177
946
1349
A
B
556
714
838
991
524
744
927
1185
540
870
1000
1235
837
1022
1206
1475
784
1078
1388
1766
854
1123
1399
1804
889
944
1019
1068
1209
1249
1277
1300
1284
1310
1350
1388
1234
1325
1442
1528
1759
1797
1840
1881
1744
1827
1860
1918
Tap
A
*M VC960403BN*
B
C
D
A
*MVC960603BN*
B
C
D
A
*MVC960803BN*
B
C
D
A
*MVC960804CN*
B
C
D
A
*MVC961005CN*
B
C
D
A
*MVC961205DN*
B
C
D
A
*CVC960403BN*
B
C
D
A
*CVC960603BN
*CVC960803BN
*CVC960804CN*
B
C
C
D
A
*CVC961005CN*
B
C
D
A
*CVC961205DN*
B
C
D
Switch Bank: S4
Heating
Airflow
DIP Switch No.
3
4
OFF
OFF
B*
ON
OFF
C
OFF
ON
D
ON
ON
A
(*Indicates factory setting)
8. Select the desired “heating” speed tap by positioning
switches S4- 3,4 appropriately. Refer to figure above.
Verify CFM by noting the number displayed on the dual 7segment LED display.
In general lower heating speeds will: reduce electrical consumption, lower operating sound levels of the blower, and increase the
outlet air temperature delivered to the home. The speeds available allow the blower performance to be optimized for the particular homeowner’s needs.
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 90, 120,
150, 180 seconds using the DIP switches or jumper provided on
the control module. The delay is factory shipped at 150 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.
Switch Bank: S1
Heat OF F Delay
90 seconds
DIP Switch No.
1
2
OFF
OFF
OFF
120 seconds
ON
150 seconds *
OFF
ON
180 seconds
ON
ON
(*Indic ates factory setting)
Heat Off Delay Dip Switches
Airflow Table
36
COMFORTNET™ SYSTEM
System
OVERVIEW
The ComfortNet system is a system that includes a ComfortNet
compatible furnace and air conditioner or heat pump with a CTK0*
thermostat. A valid ComfortNet system could also be a compatible furnace, CTK0* thermostat and non-compatible, single stage
air conditioner. Any other system configurations are considered
invalid ComfortNet systems and must be connected as a traditional (or non-communicating) system (see Electrical Connections for wiring connections).
Air Conditioner +
Furnace
A ComfortNet heating/air conditioning system differs from a
non-communicating/traditional system in the manner in which
the indoor unit, outdoor unit and thermostat interact with one
another. In a traditional system, the thermostat sends commands to the indoor and outdoor units via analog 24 VAC signals.
It is a one-way communication path in that the indoor and outdoor units typically do not return information to the thermostat.
Heat Pump +
Furnace
In a ComfortNet system, the indoor unit, outdoor unit, and
thermostat comprising a ComfortNet system “communicate” digitally with one another, creating a two-way communications path.
The thermostat still sends commands to the indoor and outdoor
units. However, the thermostat may also request and receive
information from both the indoor and outdoor units. This information may be displayed on the ComfortNet thermostat. The
indoor and outdoor units also interact with one another. The
outdoor unit may send commands to or request information from
the indoor unit. This two-way digital communications between
the thermostat and subsystems (indoor/outdoor unit) and between subsystems is the key to unlocking the benefits and features of the ComfortNet system.
Furnace + NonComm 1stg Air
Conditioner
System Operating
Mode
Airflow Demand Source
Cooling
Air Conditioner
Heating
Furnace
Continuous Fan
Thermostat
Cooling
Heat Pump
Heat Pump Heating
Only
Heat Pump
Auxiliary Heating
Furnace
Continuous Fan
Thermostat
Cooling
Furnace
Heating
Furnace
Continuous Fan
Thermostat
For example, assume the system is an air conditioner
matched with a furnace. With a call for low stage cooling,
the air conditioner will calculate the system’s low stage cooling airflow demand. The air conditioner will then send a fan
request along with the low stage cooling airflow demand to
the furnace. Once received, the furnace will send the low
stage cooling airflow demand to the ECM motor. The ECM
motor then delivers the low stage cooling airflow. See the
applicable ComfortNet air conditioner or heat pump installation manual for the airflow delivered during cooling or heat
pump heating.
Two-way digital communications is accomplished using only two
wires. The thermostat and subsystem controls are power with
24 VAC. Thus, a maximum of 4 wires between the equipment
and thermostat is all that is required to operate the system.
In continuous fan mode, the CTK0* thermostat provides the
airflow demand. The thermostat may be configured for a
low, medium, or high continuous fan speed. The low, medium, and high fan speeds correspond to 25%, 50%, and 75%,
respectively, of the furnaces’ maximum airflow capability.
During continuous fan operation, the thermostat sends a
fan request along with the continuous fan demand to the
furnace. The furnace, in turn, sends the demand to the
ECM motor. The ECM motor delivers the requested continuous fan airflow.
AIRFLOW CONSIDERATIONS
Airflow demands are managed differently in a fully communicating system than they are in a non-communicating wired
system. The system operating mode (as determined by the
thermostat) determines which unit calculates the system
airflow demand. If the indoor unit is responsible for determining the airflow demand, it calculates the demand and
sends it to the ECM motor. If the outdoor unit or thermostat is responsible for determining the demand, it calculates the demand and transmits the demand along with a
fan request to the indoor unit. The indoor unit then sends
the demand to the ECM motor. The table below lists the
various ComfortNet systems, the operating mode, and airflow demand source.
FOSSIL FUEL APPLICATIONS
This furnace can be used in conjunction with a ComfortNet compatible heat pump in a fossil fuel application. A fossil fuel application refers to a combined gas furnace and heat pump installation which uses an outdoor temperature sensor to determine the
most cost efficient means of heating (heat pump or gas furnace). When used with the CTK0* thermostat, the furnace/
heat pump system is automatically configured as a fossil
fuel system. The balance point temperature may be adjusted via the CTK0* thermostat advanced user menus (see
CTK0* instructions for additional information).
37
CTK0* WIRING
COMFORTNET™ COMPATIBLE FURNACE WITH NON-COMFORTNET
COMPATIBLE SINGLE-STAGE AIR CONDITIONER
NOTE: A removable plug connector is provided with the control
to make thermostat wire connections. This plug may be
removed, wire connections made to the plug, and replaced. It is
STRONGLY recommended that you do not connect multiple
wires into a single terminal. Wire nuts are recommended to
ensure one 18 AWG wire is used for each terminal. Failure to
do so may result in intermittent operation.
Four wires are required between the furnace and thermostat.
Two wires are required between the furnace control and single
stage air conditioner. For this system configuration, the “Y1”
terminal on the integrated furnace control becomes an output
rather than an input. The “Y1” connection to the outdoor unit
is made using both 4-position thermostat connectors in the
CTK0* kit. Remove the red keying tabs from the on-board
connector block and position both 4-position connector such
that “1”, “2”, “R”, “C”, and “Y1” positions are filled.
Typical 18 AWG thermostat wire may be used to wire the system
components. One hundred (100) feet is the maximum length of
wire between indoor unit and outdoor unit, or between indoor
unit and thermostat. Wire runs over (100) feet require larger
gauge wire.
FOUR-WIRE INDOOR
AND
CTK0*
Thermostat
OUTDOOR WIRING
Typical ComfortNet wiring will consist of four wires between the
indoor unit and outdoor unit and between the indoor unit and
thermostat. The required wires are: (a) data lines, 1 and 2; (b)
thermostat “R” (24 VAC hot) and “C” (24 VAC common).
CTK0*
Thermostat
1
2
R C
1
2
ComfortNet Compatible Furnace
R C Integrated Control Module
1
2
R C
2
R
C
1
2
R C G
C
ComfortNet Compatible AC/HP
Integrated Control Module
NOTE: Use of a transformer is recommended if installing a dual
fuel/fossil fuel system. Failure to use the transformer in the
outdoor unit could result in over loading of the furnace transformer.
CTK0*
Thermostat
R C
1
2
ComfortNet Compatible
R C Furnace Integrated
Control Module
1
2
R C
40VA Transformer
O
ComfortNet Compatible
Furnace Integrated
Control Module
Non-ComfortNet Compatible
Single Stage AC
The ComfortNet system permits access to additional system
information, advanced setup features, and advanced diagnostic/troubleshooting features. These advanced features are organized into a menu structure. The menus are accessed and
navigated by means of the CTK0* thermostat. For details,
see the thermostat instruction manual.
Two wires can be utilized between the indoor and outdoor units.
For this wiring scheme, only the data lines, 1 and 2, are needed
between the indoor and outdoor units. A 40VA, 208/230 VAC to
24VAC transformer must be installed in the outdoor unit to provide 24VAC power to the outdoor unit’s electronic control. See
instruction manual provided with the thermostat for wiring
instructions.
2
Y
Y2
COMFORTNET SYSTEM ADVANCED FEATURES
TWO-WIRE OUTDOOR, FOUR-WIRE INDOOR WIRING
1
W1 W2 Y1
System Wiring between Furnace and Non-Communicating
Compatible Single Stage Air Conditioner
Figure 53
System Wiring using Four-Wires
Figure 51
208/230 VAC
1
4-Position Connectors
from CTK0*
Thermostat Kit
ComfortNet Compatible
AC/HP Integrated
Control Module
24 VAC
System Wiring using Two-Wires between Furnace and AC/HP and
Four-Wires between Furnace and Thermostat
Figure 52
38
FURNACE ADVANCED FEATURES MENUS
(accessed through the communicating thermostat)
CONFIGURATION
Submenu Item
Number of Heat Stages (HT STG)
Indication (for Display Only; not User Modifiable)
Displays the number of furnace heating stages
Input Rate (BTU/HR)
Motor HP (1/2, ¾, or 1 MTR HP)
Displays the furnace input rate in kBtu/hr
Displays the furnace indoor blower motor horsepower
DIAGNOSTICS
Submenu Item
Fault 1 (FAULT #1)
Indication/User Modifiable Options
Most recent furnace fault
Comments
For display only
Fault 2 (FAULT #2)
Fault 3 (FAULT #3)
Next most recent furnace fault
Next most recent furnace fault
For display only
For display only
Fault 4 (FAULT #4)
Fault 5 (FAULT #5)
Next most recent furnace fault
Next most recent furnace fault
For display only
For display only
Fault 6 (FAULT #6)
Least recent furnace fault
Clear Fault History (CLEAR)
NO or YES
For display only
Selecting “YES” clears the fault
history
NOTE: Consecutively repeated faults are shown a maximum of 3 times.
IDENTIFICATION
Submenu Item
Model Number (MOD NUM)
Indication (for Display Only; not User Modifiable)
Displays the furnace model number
Serial Number (SER NUM)
Software (SOFTWARE)
Displays the furnace serial number (Optional)
Displays the application software revision
39
SET-UP
Submenu Item
Heat Airflow Trim (HT TRM)
Heat ON Delay (HT ON
User Modifiable Options
-10% to +10% in 2% increments,
default is 0%
5, 10, 15, 20, 25, or 30 seconds,
default is 30 seconds
Comments
Trims the heating airflow by the selected
amount.
Selects the indoor blower heat ON delay
30, 60, 90, 120, 150, or 180 seconds,
default is 150 seconds
Selects the indoor blower heat OFF delay
Heat Airflow (HT ADJ)
1, 2, 3, or 4
Selects the nominal heating airflow (see
Startup Procedure and Adjustment –
Circulator Blower Speeds for addition
information)
Auxiliary Alarm
ON / OFF
Enable or Disable Auxiliary Alarm Input
ON / OFF / IND
Select Humidity Relay Functionality. ON Humidifier is turned on with heat demand.
OFF - Humidifier remains off. IND - Humidifier
will cycle with humidification demand
(independent of an active heat demand)
1, 2, 3, 4
Select Humidity Fan Speed (this option is
enabled when Humidity Setting of IND is
selected). 1 - 25%, 2 - 50%, 3 - 75%, 4 100% of maximum airflow.
Heat OFF Delay (HT OFF)
Humidity Setting
Humidity Fan Speed
STATUS
Submenu Item
Mode (MODE)
CFM (CFM)
Indication (for Display Only; not User Modifiable)
Displays the current furnace operating mode
Displays the airflow for the current operating mode
NON-COMM (APPLIES ONLY TO A COMMUNICATING COMPATIBLE FURNACE MATCHED
WITH A NON-COMMUNICATING COMPATIBLE SINGLE STAGE AIR CONDITIONER)
Submenu Item
Cool Airflow (CL CFM)
User Modifiable Options
18, 24, 30, 36, 42, 48, or 60, default
is 18
Cool Airflow Trim (CL TRM)
-10% to +10% in 2% increments,
default is 0%
Cool Airflow Profile (CL PRFL)
A, B, C, or D, default is A
Cool ON Delay (CL ON)
5, 10, 20, or 30 seconds, default is
5 seconds
Cool OFF Delay (CL OFF)
30, 60, 90, or 120 seconds, default
is 30 seconds
40
Comments
Selects the airflow for the noncommunicating compatible single stage AC
unit
Selects the airflow trim amount for the noncommunicating compatible single stage AC
unit
Selects the airflow profile for the noncommunicating compatible single stage AC
unit
Selects the indoor blower ON delay for the
non-communicating compatible single
stage AC unit
Selects the indoor blower OFF delay for the
non-communicating compatible single
stage AC unit
data 1 is increasing towards +5V, data 2 is decreasing towards
ground and when data 1 is decreasing towards ground, data 2
is increasing towards +5V. Typically, the data 1 line is approximately 2.6Vdc and the data 2 transmission line is approximately 2.3Vdc. The voltage difference between data 1 and
data 2 is typically 0.2 to 0.6 Vdc.
THERMOSTAT MENU
If this furnace is installed with a communicating compatible
heat pump, the system is recognized as a dual fuel system.
The balance point temperature should be set via the thermostat.
DIAGNOSTICS
The ComfortNet™ system is a fully communicating system, and
thus, constitutes a network. Occasionally the need to troubleshoot the network may arise. The integrated furnace control
has some on-board tools that may be used to troubleshoot the
network. These tools are: red communications LED, green
receive (Rx) LED, and learn button.
•
Red communications LED – Indicates the status of the
network. The table below indicates the LED status
and the corresponding potential problem.
•
Green receive LED – Indicates network traffic. The
table below indicates the LED status and the
corresponding potential problem.
•
Learn button – Used to reset the network. Depress
the button for approximately 2 seconds to reset the
network.
Accessing the furnace’s diagnostics menu provides ready access to the last six faults detected by the furnace. Faults are
stored most recent to least recent. Any consecutively repeated
fault is stored a maximum of three times. Example: A clogged
return air filter causes the furnace limit to trip repeatedly. The
control will only store this fault the first three consecutive times
the fault occurs. Navigate to the diagnostics menu as described above in the thermostat installation manual.
NOTE: It is highly recommended that the fault history be cleared
when performing maintenance or servicing the furnace.
NETWORK
TROUBLESHOOTING
Communications is achieved by taking the difference between
two dc signals. The signals and transmission lines are referred to as “data 1” and “data 2”. Each transmission line is
biased to approximately 2.5Vdc. During data reception/transmission, the data lines vary between +5V and ground. (When
LED
Description
Possible Cause
Corrective Action
None
Comments
Off
Normal condition
None
1 Flash
Communications
Failure
Communications
Failure
2 Flashes
Out-of-box reset
Off
•Nopower
•Communications
error
•No power to furnace
•Open fuse
•Communications error
•Check fuses and circuit
breakers; replace/reset
•Replace blown fuse
•Check for shorts in low
voltage wiring in furnace/
system
•Reset network by
depressing learn button
•Check data 1/ data 2
voltages
•Turn power OFF prior to
repair
1 Steady
Flash
No network
found
•Broken/ disconnected
data wire(s)
•Furnace is installed
as a legacy/ traditional
system
•Check communications
wiring (data 1/ data 2
wires)
•Check wire connections
at terminal block
•Verify furnace installation
type (legacy/ traditional
or communicating) Check
data 1/ data 2 voltages
•Turn power OFF prior to
repair
•Verify wires at terminal
blocks are securely
twisted together prior to
inserting into terminal
block
•Verify data1 and data
voltages as described
above
Rapid
Flashing
Normal network
traffc
Control is “talking” on
network as expected
None
On Solid
Data 1/ Data 2
miss-wire
•Data 1 and data 2 wires
reversed at furnace,
thermostat, or CT™
compatible outdoor AC/
HP
•Short between data 1
and data 2 wires
•Short between data 1
or data 2 wires and R
(24VAC) or C (24VAC
common)
•Check communications
wiring (data 1/ data 2
wires)
•Check wire connections
at terminal block
•Check data 1/ data 2
voltages
Red
Communications
LED
•Control power up
•Learn button depressed
Green Receive
LED
41
•Depress Learn Button
•Verify that bus BIAS and
TERM dipswitches are in
the ON position.
None
None
•Depress once quickly for
a power-up reset
•Depress and hold for 2
seconds for an out-of-box
reset
None
None
•Turn power OFF prior to
repair
•Verify wires at terminal
blocks are securely
twisted together prior to
inserting into terminal
block
•Verify data1 and data
voltages as described
above
•
SYSTEM TROUBLESHOOTING
NOTE: Refer to the instructions accompanying the ComfortNet
compatible outdoor AC/HP unit for troubleshooting information.
Refer to the Troubleshooting Chart in the back of this manual
for a listing of possible furnace error codes, possible causes
and corrective actions.
•
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 displays 8 8 on dual 7segment display LED’s.
•
Integrated control module monitors safety circuits
continuously.
•
Furnace awaits call from thermostat. Dual 7-segment
LED’s display O while awaiting call from thermostat.
•
•
•
HEATING MODE
The normal operational sequence in heating mode is as follows:
•
R and W1 (or R and W1/W2) thermostat contacts
close, initiating a call for heat.
•
Integrated control module performs safety circuit
checks.
•
Induced draft blower is energized on high speed for
a 15-second prepurge. Humidifier terminal is
energized with induced draft blower.
•
Induced draft blower steps to low speed following
prepurge. Low stage pressure switch contacts are
closed.
•
Igniter warm up begins upon step to low speed and
presence of closed low stage 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 detected.
•
If the thermostat call is for low heat, gas valve and
induced draft blower will continue on low stage. If
the call is for high heat, the gas valve and induced
draft blower will change to high stage.
•
Circulator blower is energized on heat speed following
a thirty (30) second blower on delay. The circulator
blower requires thirty seconds to ramp up to full
speed. Electronic air cleaner terminal is energized
with circulator blower.
•
Furnace is now operating on the specified stage
called for by the two-stage thermostat.
•
Furnace runs, integrated control module monitors
safety circuits continuously.
•
•
•
If the two-stage thermostat changes the call from
low heat to high heat, the integrated control module
will immediately switch the induced draft blower,
gas valve, and circulator blower to their high stage
settings.
If the two-stage thermostat changes the call from
high heat to low heat, the control will immediately
switch the induced draft blower and gas valve to
their low stage settings. The circulator blower will
remain on high heating speed for thirty (30) seconds
before switching to the low heat circulating speed.
R and W1 (or R and W1/W2) 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 continues running for the selected
heat off delay period (90, 120, 150 or 180 seconds).
The speed run during this period depends on the
last heat call provided by the thermostat.
If the last call for heat was a call for low heat, the
air circulator motor will run on low heat speed for
the duration of the heat off delay period (90, 120,
150 or 180 seconds).
If the last call for heat was a call for high heat, the
air circulating motor will run on the high heating
speed for thirty (30) seconds and then switch to the
low heating speed for the balance of the heat off
delay period (60, 90, 120 or 150 seconds).
Circulator blower and electronic air cleaner terminal
is de-energized.
Circulator blower ramps down to OFF during the 30
seconds following the heat off delay period.
Furnace awaits next call from thermostat.
COOLING MODE
The normal operational sequence in cooling mode is as follows:
•
R and Y1/G or Y2/G thermostat contacts close,
initiating a call for cool.
•
Integrated control module performs safety circuit
checks.
•
Outdoor fan and compressor are energized to their
appropriate speed.
•
Circulator blower is energized on the appropriate
cool speed at the level and time determined by the
selected ramping profile. Electronic air cleaner
terminal is energized with circulator blower.
•
Furnace circulator blower and outdoor cooling unit
run their appropriate speeds, integrated control
module monitors safety circuits continuously.
•
R and Y1/G or Y2/G thermostat contacts open,
completing the call for cool.
•
Outdoor fan and compressor are de-energized.
•
Circulator blower continues running during a cool
off delay period. The OFF delay time and airflow
level are determined by the selected ramping profile.
42
•
•
INTEGRATED CONTROL MODULE
Electronic air cleaner terminal and circulator blower
are de-energized.
Furnace awaits next call from thermostat.
The integrated control module is an electronic device which, if a
potential safety concern is detected, will take the necessary precautions and provide diagnostic information through an LED.
FAN ONLY MODE
PRIMARY LIMIT
The normal operational sequence in fan only mode is as follows:
•
R and G thermostat contacts close, initiating a call
for fan.
•
Integrated control module performs safety circuit
checks.
•
Circulator blower is energized on continuous fan
speed (25, 50, 75 or 100% of the furnace’s maximum
airflow capability. Fan speed selected by dip
switches) following a five (5) second delay. Electronic
air cleaner terminal is 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 terminal is de-energized.
•
Furnace awaits next call from thermostat.
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 overheating as a result
of insufficient conditioned air passing over the heat exchanger.
AUXILIARY LIMIT
The auxiliary limit controls are located on or near the circulator
blower and monitors blower compartment temperatures. They
are a normally-closed (electrically), manual-reset sensors. 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 normallyclosed (electrically), manual-reset sensors. These limits guard
against burner flames not being properly drawn into the heat
exchanger.
OPERATIONAL CHECKS
PRESSURE SWITCHES
The burner flames should be inspected with the burner compartment door installed. 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.
The pressure switches are normally-open (closed during operation) negative air pressure-activated 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.
TROUBLESHOOTING
Burner Flame
Figure 54
ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS
NOTE: Discharge body’s static electricity before touching unit.
An electrostatic discharge can adversely affect electrical
components.
SAFETY CIRCUIT DESCRIPTION
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.
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.
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.
43
2. Firmly touch a clean, unpainted, metal surface of the
furnace away from 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.
MAINTENANCE
DIAGNOSTIC CHART
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.
WARNING
TO AVOID ELECTRICAL SHOCK , INJURY OR DEATH,
DISCONNECT ELECTRICAL POWER BEFORE PERFORMING ANY
MAINTENANCE. 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
WARNING
HIGH VOLTAGE !
TO AVOID PERSONAL INJURY OR DEATH DUE TO
ELECTRICAL SHOCK, DISCONNECT ELECTRICAL POWER
BEFORE PERFORMING ANY SERVICE OR MAINTENANCE.
•
Refer to the Troubleshooting Chart in the back of this manual
for assistance in determining the source of unit operational problems. The dual 7-segment LED display will display an error code
that may contain a letter and number. The error code may be
used to assist in troubleshooting the unit.
•
•
•
RESETTING FROM LOCKOUT
•
Furnace lockout results when a furnace is unable to achieve ignition after three attempts during a single call for heat. It is characterized by a non-functioning furnace and a E0 code displayed
on the dual 7-segment display. If the furnace is in “lockout”, it
will (or can be) reset in any of the following ways.
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.
3. Manual thermostat cycle. Lower the thermostat so that
there is no longer a call for heat for 1 -20 seconds then
reset to previous setting.
•
Flue pipe system. Check for blockage and/or leakage.
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
CAUTION
TO ENSURE PROPER UNIT PERFORMANCE, ADHERE TO THE FILTER SIZES
GIVEN IN THE RECOMMENDED M INIMUM FILTER SIZE TABLE OR
SPECIFICATION SHEET APPLICABLE TO YOUR MODEL.
FILTER 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.
NOTE: If the condition which originally caused the lockout still
exists, the control will return to lockout. Refer to the
Troubleshooting Chart for aid in determining the cause.
FILTER REMOVAL
Depending on the installation, differing filter arrangements can
be applied. Filters can be installed in either the central return
register or a side panel external filter rack (upflow only). A
media air filter or electronic air cleaner can be used as an alternate filter. Follow the filter sizes given in the Recommended
Minimum Filter size table to ensure proper unit performance.
44
To remove filters from an external filter rack in an upright upflow
installation, follow the directions provided with external filter
rack kit.
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.
HORIZONTAL UNIT FILTER REMOVAL
Filters in horizontal installations are located in the central return
register or the ductwork near the furnace.
To remove:
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.
FLUE PASSAGES (QUALIFIED SERVICER ONLY)
The heat exchanger flue passageways should be inspected at the
beginning of each heating season.
MEDIA AIR FILTER OR ELECTRONIC AIR CLEANER REMOVAL
BEFORE LEAVING AN INSTALLATION
Follow the manufacturer’s directions for service.
• Cycle the furnace with the thermostat at least three times.
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.
•
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.
REPAIR AND REPLACEMENT PARTS
• When ordering any of the listed functional parts, be sure
to provide the furnace model, manufacturing, and serial
numbers with the order.
• Although only functional parts are shown in the parts list,
INDUCED DRAFT AND CIRCULATOR BLOWERS
all sheet metal parts, doors, etc. may be ordered by
description.
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.
• Parts are available from your distributor.
Functional Parts ListGas Valve
Gas Manifold
Natural Gas Orifice
Propane Gas Orifice
Igniter
Flame Sensor
Rollout Limit Switch
Primary Limit Switch
Auxiliary Limit Switch
Pressure Switch
Induced Draft Blower
Door Switch
CONDENSATE TRAP AND DRAIN SYSTEM (QUALIFIED SERVICER
ONLY)
Annually inspect the drain tubes, drain trap, and field-supplied
drain line for proper condensate drainage. Check drain system
for hose connection tightness, blockage, and leaks. Clean or
repair as necessary.
45
Blower Motor
Blower Wheel
Blower Mounting Bracket
Blower Cutoff
Blower Housing
Inductor
Heat Exchanger with
Recuperator Coil
Coil Front Cover
Integrated Control Module
Transformer
DIP SWITCHES
Switch Bank
Purpose
Heating Off Delay
S1
Thermostat Setup
Cooling Airflow
S3
Trim
Ramping Profile
S4
Heating Airflow
Dehum
Trim
S5
Continuous Fan
Function
90
120
150
180
2 Stage Stat
2 Stage Stat
1 Stg Stat 5 min delay
1 Stg Stat auto delay
A
B
C
D
Add 5%
Minus 5%
Add 10%
Minus 10%
A
B
C
D
A
B
C
D
Disabled
Enabled
Disabled
Enabled
25%
50%
75%
100%
46
1
Off
On
Off
On
Off
On
Off
On
Off
On
Off
On
Dip Switch
2
3
Off
Off
On
On
On
On
Off
Off
Off
Off
On
On
Off
On
Off
On
Off
Off
On
On
Off
On
Off
On
4
On
Off
Off
On
Off
Off
On
On
Off
Off
On
On
Off
On
Off
On
Off
On
Off
On
Off
Off
On
On
STATUS CODES
INTERNAL CONTROL FAULT/NO POWER
O n
0
NORMAL OPERATION
LOCKOUT DUE TO EXCESSIVE RETRIES
E 1
E 2
LOW STAGE PRESSURE SWITCH STUCK CLOSED AT START OF HEATING CYCLE
E
E
E
E
OPEN HIGH LIMIT SWITCH
3
4
5
6
LOW STAGE PRESSURE SWITCH STUCK OPEN
FLAME DETECTED WHEN NO FLAME SHOULD BE PRESENT
OPEN FUSE
LOW FLAME SIGNAL
E 7
IGNITER FAULT OR IMPROPER GROUNDING
E 8
HIGH STAGE PRESSURE SWITCH STUCK CLOSED AT START OF HEATING CYCLE
E
E
E
d
d
b
b
b
b
b
HIGH STAGE PRESSURE SWITCH STUCK OPEN
9
A
F
0
4
0
1
2
3
4
REVERSED 115 VAC POLARITY
AUXILIARY SWITCH OPEN
DATA NOT YET ON NETWORK
INVALID MEMORY CARD DATA
BLOWER MOTOR NOT RUNNING
BLOWER COMMUNICATION ERROR
BLOWER HP MIS-MATCH
BLOWER MOTOR OPERATING IN POWER, TEMPERATURE, OR SPEED LIMIT
BLOWER MOTOR CURRENT TRIP OR LOST ROTOR
b 5
b 6
b 7
BLOWER MOTOR LOCKED ROTOR
b 9
LOW INDOOR AIRFLOW
OVER/UNDER VOLTAGE TRIP OR OVER TEMPERATURE TRIP
INCOMPLETE PARAMETERS SENT TO MOTOR
C 1 LOW STAGE COOL
C 2 HIGH STAGE COOL
P 1
P
HIGH STAGE HEAT PUMP HEAT
L 0
LOW STAGE GAS HEAT
H I
F
HIGH STAGE GAS HEAT
1 2
CFM/100; ALTERNATES WITH
CONTINUOUS FAN
C 1
,
,
P 1,P 2
47
L O, H I
,
F
0140F01169 REV A
TROUBLESHOOTING CHART
Symptoms of Abnormal Diagnostic/
Operation (Legacy &
Status LED
ComfortNet™ Thermostat)
Codes
Fault Description
ComfortNet™
Thermostat Only
Message
Code
INTERNAL
FAULT
EE
Possible Causes
Corrective Actions
Notes & Cautions
• Manual disconnect switch
OFF, door switch open or
24 volt wire improperly
connected or loose
• Blown fuse or circuit
breaker
• Integrated control module
has an internal fault
• Assure 115 and 24
volt power to furnace
and integrated control
module.
• Check integrated control
module fuse (3A).
Replace if necessary.
• Check for possible
shorts in 115 and 24
volt circuits. Repair as
necessary.
• Replace bad integrated
control module.
• Turn power OFF prior
to repair.
• Replace integrated
control module fuse
with 3A automotive
fuse.
• Read precautions
in “Electrostatic
Discharge” section of
manual.
• Replace control with
correct replacement
part
• Furnace fails to operate
• Integrated control module
LED display provides no
signal.
• ComfortNet™ thermostat
“Call for Service” icon
illuminated
• ComfortNet™ thermostat
scrolls “Check Furnace”
message
None
• LED display indicates On
On
• Normal operation
None
None
• Normal operation
• None
• Normal operation
• Furnace fails to operate
• Integrated control module
LED display provides E0
error code.
• ComfortNet™ thermostat
“Call for Service” icon
illuminated.
• ComfortNet™ thermostat
scrolls “Check Furnace”
message.
E0
• Furnace lockout
due to an excessive
number of ignition
“retries” (3 total)
LOCKOUT
E0
• Failure to establish fame.
Cause may be no gas
to burners, front cover
pressure switch stuck
open, bad igniter or igniter
alignment, improper
orifces, or coated/oxidized
or improperly connected
fame sensor.
• Loss of fame after
establishment. Cause
may be interrupted gas
supply, lazy burner fames
(improper gas pressure
or restriction in fue and/
or combustion air piping),
front cover pressure switch
opening, or improper
induced draft blower
performance.
• Locate and correct gas
interruption.
• Check front cover
pressure switch operation
(hose, wiring, contact
operation). Correct if
necessary.
• Replace or realign igniter.
• Check fame sense
signal. Sand sensor if
coated and/or oxidized.
• Check fue piping for
blockage, proper length,
elbows, and termination.
• Verify proper induced
draft blower performance.
• Turn power OFF prior
to repair.
• Igniter is fragile,
handle with care.
• Sand fame sensor
with emery cloth.
• See “Vent/Flue Pipe”
section for piping
details.
• Furnace fails to operate.
• Integrated control module
LED display provides E1
error code.
• ComfortNet™ thermostat
“Call for Service” icon
illuminated.
• ComfortNet™ thermostat
scrolls “Check Furnace”
message.
E1
• Low stage pressure
switch circuit is
closed at start of
heating cycle.
PS1
CLOSED
E1
• Low stage pressure switch • Replace low stage
contacts sticking.
pressure switch.
• Shorts in pressure switch • Repair short in wiring.
circuit wiring.
• No 115 power to
furnace or no 24 volt
power to integrated
control module
• Blown fuse or circuit
breaker
• Integrated control
module has an
internal fault
48
• Turn power OFF prior
to repair.
• Replace pressure
switch with proper
replacement part.
TROUBLESHOOTING CHART
Symptoms of Abnormal
Operation (Legacy
& ComfortNet™
Thermostat)
Diagnostic/
Status LED
Codes
Fault Description
ComfortNet™
Thermostat Only
Message
Code
Possible Causes
Corrective Actions
Notes & Cautions
• Induced draft blower
runs continuously with no
further furnace operation.
• Integrated control module
LED display provides E2
error code.
• ComfortNet™ thermostat
“Call for Service” icon
illuminated.
• ComfortNet™ thermostat
scrolls “Check Furnace”
message.
E2
• Low stage
pressure switch
circuit is not
closed.
PS1 OPEN
E2
• Pressure switch hose
blocked pinched, or
connected improperly.
• Blocked fue and/or inlet
air pipe, blocked drain
system or weak induced
draft blower.
• Incorrect pressure
switch set point or
malfunctioning switch
contacts.
• Loose or improperly
connected wiring.
• Inspect pressure switch
hose. Repair/replace if
necessary.
• Inspect fue and/or inlet
air piping for blockage,
proper length, elbows,
and termination. Check
drain system. Correct as
necessary.
• Check induced draft
blower performance.
Correct as necessary.
• Correct pressure switch
set point or contact
motion.
• Tighten or correct wiring
connection.
• Turn power OFF prior
to repair.
• Replace pressure
switch with proper
replacement part.
• Replace induced draft
blower with proper
replacement part.
• Circulator blower
runs continuously. No
furnace operation.
• Integrated control
module LED display
provides E3 error code.
• ComfortNet™
thermostat “Call
for Service” icon
illuminated.
• ComfortNet™
thermostat scrolls
“Check Furnace”
message.
E3
• Primary limit or
auxiliary limit
circuit is open.
• Rollout limit
circuit is open.
HIGH LIMIT
OPEN
E3
• Insuffcient conditioned
air over the heat
exchanger. Blocked
flters, restrictive
ductwork, improper
circulator blower
speed, or failed
circulator blower motor.
• Flame rollout.
• Misaligned burners,
blocked fue and/or
air inlet pipe, or failed
induced draft blower.
• Loose or improperly
connected wiring.
• Check flters and
ductwork for blockage.
Clean flters or remove
obstruction.
• Check circulator
blower speed and
performance. Correct
speed or replace blower
motor if necessary.
• Check burners for
proper alignment.
• Check fue 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 Specifcation
Sheet applicable
to your model* for
allowable rise range
and proper circulator
speed.
• See "Vent/Flue Pipe"
section for piping
details.
• Induced draft blower
and circulator blower
runs continuously. No
furnace operation.
• Integrated control
module LED display
provides E4 error code.
• ComfortNet™
thermostat “Call
for Service” icon
illuminated.
• ComfortNet™
thermostat scrolls
“Check Furnace”
message.
E4
• Flame sensed
with no call for
heat.
IMPROPER
FLAME
E4
• Short to ground in
fame sense circuit.
• Lingering burner fame.
• Slow closing gas valve.
• Correct short at fame
sensor or in fame
sensor wiring.
• Check for lingering
fame.
• Verify proper operation
of gas valve.
• Turn power OFF
prior to repair.
• No furnace operation.
• Integrated control
module LED display
provides E5 error code.
• ComfortNet™
thermostat displays
“Battery Power”
E5
• Open Fuse
• Locate and correct
short in low voltage
wiring
• Turn power OFF
prior to repair.
• Replace fuse with
3-amp automotive
type
• Normal furnace
operation.
• Integrated control
module LED display
provides E6 error code.
E6
• Flame sense
micro amp signal
is low
• Sand fame sensor if
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.
Adjust as needed.
• Turn power OFF
prior to repair.
• Sand fame sensor
with emery cloth.
• See "Vent/Flue Pipe"
section for piping
details.
• See rating plate for
proper gas pressure.
Not
Displayed
WEAK
FLAME
Not
• Short in low voltage
Displayed
wiring
E6
49
• Flame sensor is
coated/oxidized.
• Flame sensor
incorrectly positioned
in burner fame.
• Lazy burner fame
due to improper gas
pressure or combustion
air.
TROUBLESHOOTING CHART
Symptoms of Abnormal
Operation (Legacy
& ComfortNet™
Thermostat)
Diagnostic/
Status LED
Codes
Fault Description
ComfortNet™
Thermostat Only
Possible Causes
Message
Code
IGNITER
FAULT
E7
• Improperly connected
igniter.
• Shorted igniter.
• Poor unit ground.
• Igniter relay fault on
integrated control
module.
Corrective Actions
• Check and correct
wiring from integrated
control module to
igniter.
• Replace shorted igniter.
• Check and correct unit
ground wiring.
• Check igniter output
from control. Replace if
necessary.
Notes & Cautions
• Turn power OFF
prior to repair.
• Replace igniter with
correct replacement
part.
• Replace control with
correct replacement
part.
• Furnace fails to operate.
• Integrated control
module LED display
provides E7 error code.
• ComfortNet™
thermostat “Call
for Service” icon
illuminated.
• ComfortNet™
thermostat scrolls
“Check Furnace”
message.
E7
• Problem with
igniter circuit.
• Furnace fails to operate
on high stage; furnace
operates normally on low
stage.
• Integrated control module
LED display provides E8
error code.
E8
• High stage
pressure switch
circuit is closed
at start of heating
cycle.
• Induced draft
blower is
operating.
• Furnace is
operating on low
stage only
PS2 CLOSED
E8
• High stage pressure
• Replace high stage
switch contacts sticking.
pressure switch.
• Shorts in pressure
• Repair short in wiring
switch circuit wiring.
• Turn power OFF prior
to repair.
• Replace pressure
switch with proper
replacement part.
• Furnace fails to operate
on high stage; furnace
operates normally on low
stage.
• Integrated control module
LED display provides E9
error code.
E9
• High stage
pressure switch
circuit is not
closed.
• Induced draft
blower is
operating.
• Furnace is
operating on low
stage only
PS2 OPEN
E9
• Pressure switch hose
blocked pinched, or
connected improperly.
• Blocked fue and/or inlet
air pipe, blocked drain
system or weak induced
draft blower.
• Incorrect pressure
switch set point or
malfunctioning switch
contacts.
• Loose or improperly
connected wiring.
• Inspect pressure switch
hose. Repair/replace if
necessary.
• Inspect fue and/or inlet
air piping for blockage,
proper length, elbows,
and termination. Check
drain system. Correct as
necessary.
• Check induced draft
blower performance.
Correct as necessary.
• Correct pressure switch
set point or contact
motion.
• Tighten or correct wiring
connection.
• Turn power OFF prior
to repair.
• Replace pressure
switch with proper
replacement part.
• Replace induced draft
blower with proper
replacement part.
• Furnace fails to operate.
• Integrated control module
LED display provides EA
error code.
• ComfortNet™ thermostat
“Call for Service” icon
illuminated.
• ComfortNet™ thermostat
scrolls “Check Furnace”
message.
EA
• Polarity of 115 volt
AC is reversed
REVERSED
PLTY
EA
• Polarity of 115 volt AC
power to furnace or
integrated module is
revered.
• Poor unit ground
• Review wiring diagram to • Turn power OFF prior
correct polarity.
to repair.
• Verify proper ground.
Correct if necessary.
• Check and correct
wiring.
• Integrated control
module LED display EF
error code.
• ComfortNet™ thermostat
“Call for Service” .
EF
• Aux switch open
Aux Alarm
Fault
EF
• High water level in the
evaporation coil.
• Check overfow pan and
service.
• Turn power OFF prior
to service.
• Furnace fails to operate.
• Integrated control module
LED display provides d0
error code.
• ComfortNet™ thermostat
“Call for Service” icon
illuminated.
• ComfortNet™ thermostat
scrolls “Check Furnace”
message.
d0
• Data not yet on
network.
NO NET
DATA
d0
• Furnace does not
• Populate shared data
contain any shared data.
set using memory card.
• Turn power OFF prior
to repair
• Use memory card for
the specifc model.
• Insert memory card
BEFORE turning
power ON. Memory
card may be removed
after data is loaded
and power is turned
off.
• Error code will be
cleared once data is
50
TROUBLESHOOTING CHART
Symptoms of Abnormal
Diagnostic/
Operation (Legacy
Status LED Fault Description
& ComfortNet™
Codes
Thermostat)
ComfortNet™
Thermostat Only
Message
Code
Possible Causes
Corrective Actions
Notes & Cautions
• Operation different than
expected or no operation.
• Integrated control
module LED display
provides d4 error code.
• ComfortNet™ thermostat
“Call for Service” icon
illuminated.
• ComfortNet™ thermostat
scrolls “Check Furnace”
message.
d4
• Invalid memory
card data.
INVALID MC
DATA
d4
• Shared data set on
memory card has been
rejected by integrated
control module
• Furnace fails to operate.
• Integrated control
module LED display
provides b0 error code.
• ComfortNet™ thermostat
“Call for Service” icon
illuminated.
• ComfortNet™ thermostat
scrolls “Check Furnace”
message.
b0
MOTOR NOT
• Circulator blower
RUN
motor is not
running when it
should be running.
b0
• Loose wiring connection • Tighten or correct wiring
connection.
at circulator motor
power leads or
• Verify continuous
circulator motor power
circuit through inductor.
leads disconnected.
Replace if open or short
• Open circuit in inductor
circuit.
or loose wiring
• Check circulator blower
connection at inductor
motor. Replace if
(3/4 Hp and 1 Hp
necessary.
models only).
• Failed circulator blower
motor.
• Furnace fails to operate.
• Integrated control
module LED display
provides b1 error code.
• ComfortNet™ thermostat
“Call for Service” icon
illuminated.
• ComfortNet™ thermostat
scrolls “Check Furnace”
message.
b1
• Integrated control
module has lost
communications
with circulator
blower motor.
MOTOR
COMM
b1
• Loose wiring connection • Tighten or correct wiring • Turn power OFF prior
at circulator motor
connection.
to repair
control leads.
• Check circulator blower • Replace circulator
• Failed circulator blower
motor with correct
motor. Replace if
motor.
necessary.
replacement part.
• Failed integrated control • Check integrated control • Replace integrated
module.
module. Replace if
control module with
necessary.
correct replacement
part.
• Furnace fails to operate.
• Integrated control
module LED display
provides b2 error code.
• ComfortNet™ thermostat
“Call for Service” icon
illuminated.
• ComfortNet™ thermostat
scrolls “Check Furnace”
message.
b2
• Circulator blower
motor horse
power in shared
data set does not
match circulator
blower motor
horse power.
MOTOR
MISMATCH
b2
• Incorrect circulator
• Verify circulator blower if
blower motor in furnace.
motor horse power is the
same specifed for the
• Incorrect shared data
specifc furnace model.
set in integrated control
Replace if necessary.
module.
• Verify shared data set is
correct for the specifc
model. Re-populate data
using correct memory
card if required.
• Turn power OFF prior
to repair
• Replace motor with
correct replacement
part.
• Use memory card for
the specifc model
• Insert memory card
BEFORE turning
power ON. Memory
card may be removed
after data is loaded
and power is turned
off.
• Error code will be
cleared once shared
data and motor horse
power match.
• Furnace operates at
reduced performance.
• Airfow delivered is less
than expected.
• Integrated control
module LED display
provides b3 error code.
b3
• Circulator blower
motor is operating
in a power,
temperature, or
speed limiting
condition.
MOTOR
LIMITS
b3
•
•
•
•
• Turn power OFF prior
to repair.
51
Blocked flters.
Restrictive ductwork.
Undersized ductwork.
High ambient
temperatures.
• Verify shared data set is • Turn power OFF prior
correct for the specifc
to repair
model. Re-populate data • Use memory card for
using correct memory
the specifc model.
card if required.
• Insert memory card
BEFORE turning
power ON. Memory
card may be removed
after data is loaded
and power is turned
off.
• Error code will be
cleared once data is
loaded and power is
turned off.
• Check flters for
blockage. Clean flters
or remove obstruction.
• Check ductwork for
blockage. Remove
obstruction. Verify all
registers are fully open.
• Verify ductwork is
appropriately sized for
system. Resize/replace
ductwork if necessary.
• See "III. Product
Description" and "IV.
Location Requirements
& Considerations"
furnace installation
requirements.
• Turn power OFF prior
to repair
• Replace inductor with
correct replacement
part.
• Replace circulator
motor with correct
replacement part.
TROUBLESHOOTING CHART
Symptoms of Abnormal
Diagnostic/
Operation (Legacy
Status LED Fault Description
& ComfortNet™
Codes
Thermostat)
• Furnace fails to operate.
• Integrated control
module LED display
provides b4 error code.
• ComfortNet™ thermostat
“Call for Service” icon
illuminated.
• ComfortNet™ thermostat
scrolls “Check Furnace”
message.
b4
• Furnace fails to operate.
• Integrated control
module LED display
provides b5 error code.
• ComfortNet™ thermostat
“Call for Service” icon
illuminated.
• ComfortNet™ thermostat
scrolls “Check Furnace”
message.
b5
• Furnace fails to operate.
• Integrated control
module LED display
provides b6 error code.
• ComfortNet™ thermostat
“Call for Service” icon
illuminated.
• ComfortNet™ thermostat
scrolls “Check Furnace”
message.
b6
• Furnace fails to operate.
• Integrated control
module LED display
provides b7 error code.
• ComfortNet™ thermostat
“Call for Service” icon
illuminated.
• ComfortNet™ thermostat
scrolls “Check Furnace”
message.
b7
• Furnace operates at
reduced performance or
operates on low stage
when high stage is
expected.
• Integrated control
module LED display
provides b9 error code.
b9
• Circulator blower
motor senses
a loss of rotor
control.
ComfortNet™
Thermostat Only
Possible Causes
Corrective Actions
Notes & Cautions
Message
Code
MOTOR
TRIPS
b4
• Turn power OFF prior
to repair
b5
• Turn power OFF prior
to repair.
• Replace motor with
correct replacement
part.
• Replace wheel with
correct replacement
part.
• Circulator blower
motor senses
high current.
• Circulator blower MOTOR LCKD
ROTOR
motor fails to start
10 consecutive
times.
•
• Circulator blower
motor shuts down
for over or under
voltage condition.
• Circulator blower
motor shuts
down due to
over temperature
condition on
power module.
• Circulator blower
motor does not
have enough
information to
operate properly.
Motor fails to start
40 consecutive
times.
• Airflow is lower
than demanded.
MOTOR
VOLTS
b6
• Turn power OFF prior
to repair
•
•
•
MOTOR
PARAMS
b7
•
•
•
LOW ID
AIRFLOW
B9
52
• Blocked filters.
• Restrictive ductwork.
• Undersized ductwork.
• Check filters for
blockage. Clean filters
or remove obstruction.
• Check ductwork for
blockage. Remove
obstruction. Verify all
registers are fully open.
• Verify ductwork is
appropriately sized for
system. Resize/replace
ductwork if necessary.
• Turn power OFF prior
to repair.
THIS PAGE LEFT INTENTIONALLY BLANK
53
WIRING DIAGRAM
TO
115 VAC/ 1 Ø /60 HZ
POWER SUPPLY WITH
OVERCURRENT
PROTECTION DEVICE
GND
HI
3
C
2
PM
C
NO
NO
FLAME
SENSOR
C
GY
FRONT COVER
PRESSURE SWITCH
AUTO RESET PRIMARY
LIMIT CONTROL
PU
1
9
WH/PU
6
3
HEAT OFF DLY
T-STAT
24
VAC
115
VAC
OR
5
2
GY
GY
FUSE
FLAME SENSOR
115 VAC
TO +VDC
TH (4)
24 VAC
AUTO RESET PRIMARY
AUTO RESET AUXILIARY LIMIT
LIMIT CONTROL
CONTROLS
HLO (10)
Y1
PSO (7)
W1
NO
W2
Y2
TO
MICRO
HIGH FIRE
PRESS. SWTICH
WH
BL
4
3
2
1
WH
BK
BK
BK
GY
WH
5
4
3
2
1
GND
C
FRONT COVER
PRESSURE SWITCH
TR (11)
TO
R
HI
GND
GAS
VALVE
GND (4)
+ VDC (1)
RX (2)
WH
WH
TO
MICRO
PM
C
GND (5)
BK
BLOWER
COMPARTMENT
DOOR SWITCH
(OPEN WHEN
DOOR OPEN)
CIRCULATOR BLOWER
NO
MVL (13)
MVH (14)
WH
BK
WH
GR
PK
C
MANUAL RESET ROLLOUT
LIMIT CONTROLS
HLI (1)
O
C
RD
NO
PS2 (12)
MVC (8)
ECM MTR
HARNESS
LOW FIRE PRESS.
SWITCH
C
PS1 (2)
DEHUM
24 V THERMOSTAT CONNECTIONS
NEUTRAL
40 VA
TRANSFORMER
G
BK
O
Y1
Y2
G
W2
W1
R
C
2
1
PK
DEHUM
DIAGNOSTIC
LED'S
SEE
NOTE 5
BR
OR
OR
24 V
3A
4
1
TRANSFORMER
24V THERMOSTAT CONNECTIONS
12
8
40 VA
BR
11
7
RD
10
OR
PK
OR
CONT FAN
R
BK
RD
TWO-STAGE
INTEGRATED
CONTROL
BR
TRIM ENABLE
15
1
FUSE 3 A
NEUTRAL
HOT SURFACE
IGNITER
FS
GY
3
2
NEUTRAL
ID
BLWR
IND LO
IGN
BK
DEHUM ENABLE
14
IND HI
BL
4
NEUTRAL
ELECTRONIC
AIR CLEANER
1
4 CIRCUIT MOTOR
MODULE
CONNECTOR
DIP SWITCHES
TRIM %
BK
BK
GN
PU
13
3
2
NEUTRAL
HUMIDIFIER
HUM
EAC
LINE
HEAT AF
GY
4
HUMIDIFIER
HUM-OUT
COOL AF
COOL PRFL
YL
PK
BK
BL
RD
5 CIRCUIT CONNECTOR
EAC
FS
5
WH
WH
HUM
HUMIN
HUMOUT
NEUTRAL
NEUTRAL
SEE NOTE 6
INTEGRATED CONTROL MODULE
YL
WH
LINE
GND
HUM-IN
LINE
INTEGRATED CONTROL MODULE
BK
RD
WH
AUTO RESET
AUXILIARY
LIMIT CONTROL
WH
INDOOR
AIR
CIRCULATOR
BLWR
PU
BLOWER COMPARTMENT
WH
JUNCTION BOX
INDUCTOR COIL
(ON SOME MODELS)
GND
BURNER COMPARTMENT
DISCONNECT
GN
INDUCED
DRAFT
BLOWER
WH
RD
BK
2
N
DOOR
SWITCH
PK
HIGH VOLTAGE!
Disconnect ALL power before servicing or installing this unit. Multiple
power sources may be present. Failure to do so may cause property
damage, personal injury or death.
BR
BL
OR
CHASSIS GROUND
PK
BL
GND
L
WARNING:
DISCONNECT POWER
BEFORE SERVICING.
WIRING TO UNIT
MUST BE PROPERLY
POLARIZED AND
GROUNDED.
GY
NO
MANUAL RESET ROLLOUT LIMIT
CONTROLS (SINGLE CONTROL ON
40 kBTU)
3
DISCONNECT
TO 115VAC/ 1Ø /60 HZ POWER SUPPLY WITH
OVERCURRENT PROTECTION DEVICE
BR
1
WH
OR
PU
WARNING:DISCONNECT
POWER BEFORE
SERVICING. WIRING
TO UNIT MUST BE
PROPERLY POLARIZED
AND GROUNDED.
N
PU
RD
WH
TWO STAGE
GAS VALVE
(WHITERODGERS)
C
L
BK
OR
GY
OR
1
2
HIGH FIRE
PRESSURE
SWITCH
OR
HOT
LOW FIRE
SURFACE PRESSUR
IGNITER E SWITCH
2 CIRCUIT
CONNECTOR
JUNCTION BOX
YL
BR
PU
YL
ID BLOWER TWO-STAGE PRESSURE
SWITCH ASSEMBLY
TX (3)
AUX
INDOOR
AIR
CIRCULATOR
BLWR
INTEGRATED CONTROL MODULE
INDUCTOR COIL
(ON SOME MODELS)
NOTES:
1. SET HEAT ANTICIPATOR ON ROOM THERMOSTAT AT 0.7 AMPS.
2. MANUFACTURER'S SPECIFIED REPLACEMENT PARTS MUST BE USED WHEN SERVICING.
3. 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
$C. USE COPPER CONDUCTORS ONLY.
AT LEAST 105
4. UNIT MUST BE PERMANENTLY GROUNDED AND CONFORM TO N.E.C. AND LOCAL CODES.
5. TO RECALL THE LAST 6 FAULTS, MOST RECENT TO LEAST RECENT, DEPRESS SWITCH
FOR MORE THAN 2 SECONDS WHILE IN STANDBY (NO THERMOSTAT INPUTS)
6. HUMIDIFIER INSTALLATION OPTIONS: USE HUM TERMINAL TO RUN HUMIDIFIER DURING
HEAT CALL (COMMUNICATING OR LEGACY MODES). USE HUM-IN AND HUM-OUT
TERMINALS TO RUN HUMIDIFIER DURING HEAT CALL ( COMMUNICATING MODE OR
LEGACY MODE) OR INDEPENDENTLY FROM HEAT CALL (COMMUNICATING MODE ONLY SETUP IS DONE WITHIN COMMUNICATING THERMOSTAT)
COLOR CODES:
PK PINK
BR BROWN
WH WHITE
BL BLUE
GY GRAY
RD RED
YL YELLOW
OR ORANGE
PU PURPLE
GN GREEN
BK BLACK
LOW VOLTAGE (24V)
LOW VOLTAGE FIELD
HI VOLTAGE (115V)
HI VOLTAGE FIELD
JUNCTION
TERMINAL
INTERNAL TO
INTEGRATED CONTROL
PLUG CONNECTION
EQUIPMENT GND
FIELD GND
FIELD SPLICE
SWITCH (TEMP.)
IGNITER
SWITCH (PRESS.)
OVERCURRENT
PROT. DEVICE
0140F02006-A
Wiring is subject to change. Always refer to the wiring diagram on the unit for the most up-to-date wiring.
54
SPECIAL INSTRUCTIONS FOR PRODUCTS INSTALLED
IN THE STATE OF MASSACHUSETTS
VENT/FLUE
TEE
DISTANCE BETWEEN
VENT AND GRADE
COMBUSTION
AIR INTAKE.
DISTANCE BETWEEN
COMBUSTION AIR
INTAKE AND GRADE
3. SIGNAGE. A metal or plastic identification plate shall be
permanently mounted to the exterior of the building at
a minimum height of eight (8) feet above grade directly
in line with the exhaust vent terminal for the horizontally
vented gas fueled heating appliance or equipment. The
sign shall read, in print size no less than one-half (1/2)
inch in size, “GAS VENT DIRECTLY BELOW. KEEP CLEAR
OF ALL OBSTRUCTIONS”.
4. INSPECTION. The state or local gas inspector of the side
wall horizontally vented gas fueled equipment shall not
approve the installation unless, upon inspection, the
inspector observes carbon monoxide detectors and
signage installed in accordance with the provisions of
248 CMR 5.08(2)(a)1 through 4.
EXEMPTIONS
For all side wall horizontally vented gas fueled equipment installed in every dwelling, building or structure used in whole or
in part for residential purposes, including those owned or operated by the Commonwealth and where the side wall exhaust vent
termination is less than seven (7) feet above finished grade in the
area of the venting, including but not limited to decks and
porches, the following requirements shall be satisfied:
1. INSTALLATION OF CARBON MONOXIDE DETECTORS. At the
time of installation of the side wall horizontal vented gas
fueled equipment, the installing plumber or gasfitter shall
observe that a hard wired carbon monoxide detector with
an alarm and battery back-up is installed on the floor level
where the gas equipment is to be installed. In addition,
the installing plumber or gasfitter shall observe that a
battery operated or hard wired carbon monoxide detector
with an alarm is installed on each additional level of the
dwelling, building or structure served by the side wall
horizontal vented gas fueled equipment. It shall be the
responsibility of the property owner to secure the services
of qualified licensed professionals for the installation of
hard wired carbon monoxide detectors
a. In the event that the side wall horizontally vented gas
fueled equipment is installed in a crawl space or an
attic, the hard wired carbon monoxide detector with
alarm and battery back-up may be installed on the next
adjacent floor level.
b. In the event that the requirements of this subdivision
can not be met at the time of completion of installation,
the owner shall have a period of thirty (30) days to
comply with the above requirements; provided, however,
that during said thirty (30) day period, a battery operated
carbon monoxide detector with an alarm shall be
installed.
2. APPROVED CARBON MONOXIDE DETECTORS. Each carbon
monoxide detector as required in accordance with the
above provisions shall comply with NFPA 720 and be ANSI/
UL 2034 listed and IAS certified.
55
The following equipment is exempt from 248 CMR 5.08(2)(a)1
through 4:
1. The equipment listed in Chapter 10 entitled “Equipment
Not Required To Be Vented” in the most current edition
of NFPA 54 as adopted by the Board; and
2. Product Approved side wall horizontally vented gas fueled
equipment installed in a room or structure separate
from the dwelling, building or structure used in whole
or in part for residential purposes.
(c) MANUFACTURER REQUIREMENTS - GAS EQUIPMENT
VENTING SYSTEM PROVIDED. When the manufacturer
of Product Approved side wall horizontally vented gas
equipment provides a venting system design or venting
system components with the equipment, the
instructions provided by the manufacturer for
installation of the equipment and the venting system
shall include:
1. Detailed instructions for the installation of the venting
system design or the venting system components; and
2. A complete parts list for the venting system design or
venting system.
(d) MANUFACTURER REQUIREMENTS - GAS EQUIPMENT
VENTING SYSTEM NOT PROVIDED. When the
manufacturer of a Product Approved side wall
horizontally vented gas fueled equipment does not
provide the parts for venting the flue gases, but
identifies “special venting systems”, the following
requirements shall be satisfied by the manufacturer:
1. The referenced “special venting system” instructions
shall be included with the appliance or equipment
installation instructions; and
2. The “special venting systems” shall be Product Approved
by the Board, and the instructions for that system shall
include a parts list and detailed installation instructions.
(e) A copy of all installation instructions for all Product
Approved side wall horizontally vented gas fueled
equipment, all venting instructions, all parts lists for
venting instructions, and/or all venting design
instructions shall remain with the appliance or
equipment at the completion of the installation.
NOTE: SPECIFICATIONS AND PERFORMANCE DATA LISTED HEREIN
ARE SUBJECT TO CHANGE WITHOUT NOTICE.
Quality Makes the Difference!
“All of our systems are designed and manufactured with the same high quality standards
regardless of size or efficiency. We have designed these units to significantly reduce the most
frequent causes of product failure. They are simple to service and forgiving to operate. We
use quality materials and components. Finally, every unit is run tested before it leaves the
factory. That’s why we know. . . There’s No Better Quality.”
Visit our web sites at www.goodmanmfg.com or www.amana-hac.com for information on:
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© 2014 Goodman Manufacturing Company, L.P.
is a registered trademark of Maytag Corporation or its related companies and is used under license. All rights reserved.
56
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