Goodman Mfg Furnace CVC9 95 User Manual

INSTALLATION INSTRUCTIONS FOR *CVC9/95 & *MVC95 - TWO-STAGE GAS FURNACE  
(Type FSP CATEGORY IV Direct or Non Direct Vent Air Furnace)  
Installer: Affix all manuals adjacent to the unit.  
These furnaces comply with requirements em-  
bodied in theAmerican National Standard / Na-  
®
tional Standard of CanadaANSI Z21.47·CSA-2.3  
Gas Fired Central Furnaces.  
C
US  
RECOGNIZE THIS SYMBOL AS A SAFETY PRECAUTION.  
ATTENTION INSTALLING PERSONNEL  
As a professional installer you have an obligation to know the product better than the customer. This includes all  
safety precautions and related items.  
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.  
*NOTE: Please contact your distributor or our  
website for the applicable Specification  
Sheet referred to in this manual.  
5151 San Felipe Suite 500  
Houston, TX 77056  
www.goodmanmfg.com • www.amana-hac.com  
IO-341E  
12/10  
© 2009-2010 Goodman Manufacturing Company, L.P.  
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115 VOLT LINE CONNECTION OF ACCESSORIES (HUMIDIFIER AND ELECTRONIC AIR CLEANER) ............................. 29  
24 VOLT HUMIDIFIER ......................................................................................................................... 30  
GAS SUPPLY AND PIPING ......................................................................................................................... 30  
HIGH ALTITUDE DERATE ...................................................................................................................... 30  
PROPANE GAS CONVERSION ................................................................................................................ 30  
GAS VALVE ..................................................................................................................................... 31  
GAS PIPING CONNECTIONS .................................................................................................................. 31  
PROPANE GAS TANKS AND PIPING ......................................................................................................... 33  
CIRCULATING AIR & FILTERS .................................................................................................................... 34  
DUCT WORK -AIR FLOW ..................................................................................................................... 34  
CHECKING DUCT STATIC ..................................................................................................................... 34  
BOTTOM RETURN AIR OPENING [UPFLOW MODELS] .................................................................................. 35  
FILTERS - READ THIS SECTION BEFORE INSTALLING THE RETURN AIR DUCT WORK ........................................... 35  
UPRIGHT INSTALLATIONS ..................................................................................................................... 36  
HORIZONTAL INSTALLATIONS ................................................................................................................ 36  
STARTUP PROCEDURE & ADJUSTMENT ....................................................................................................... 36  
HEAT ANTICIPATOR SETTING ................................................................................................................ 37  
DRAIN TRAP PRIMING ........................................................................................................................ 37  
FURNACE OPERATION ......................................................................................................................... 37  
GAS SUPPLY PRESSURE MEASUREMENT .................................................................................................. 37  
GAS MANIFOLD PRESSURE MEASUREMENT AND ADJUSTMENT ....................................................................... 38  
GAS INPUT RATE MEASUREMENT (NATURAL GAS ONLY) ............................................................................ 39  
TEMPERATURE RISE ........................................................................................................................... 39  
CIRCULATOR BLOWER SPEEDS ............................................................................................................. 40  
BLOWER HEAT OFF DELAY TIMINGS ...................................................................................................... 42  
COMFORTNET™ SYSTEM ........................................................................................................................ 42  
OVERVIEW ....................................................................................................................................... 42  
AIRFLOW CONSIDERATIONS .................................................................................................................. 42  
FOSSIL FUEL APPLICATIONS ................................................................................................................ 42  
CTK01AA WIRING .......................................................................................................................... 43  
COMFORTNET SYSTEM ADVANCED FEATURES .......................................................................................... 44  
NETWORK TROUBLESHOOTING ................................................................................................................ 46  
SYSTEM TROUBLESHOOTING ................................................................................................................. 47  
NORMAL SEQUENCE OF OPERATION ........................................................................................................... 47  
POWER UP ...................................................................................................................................... 47  
HEATING MODE ................................................................................................................................. 47  
COOLING MODE ................................................................................................................................ 48  
FAN ONLY MODE .............................................................................................................................. 48  
OPERATIONAL CHECKS ............................................................................................................................ 49  
SAFETY CIRCUIT DESCRIPTION .................................................................................................................. 49  
INTEGRATED CONTROL MODULE ............................................................................................................. 49  
PRIMARY LIMIT ................................................................................................................................ 49  
AUXILIARY LIMIT ............................................................................................................................... 49  
ROLLOUT LIMIT ................................................................................................................................ 49  
PRESSURE SWITCHES ......................................................................................................................... 49  
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FLAME SENSOR ................................................................................................................................ 49  
TROUBLESHOOTING ................................................................................................................................. 49  
ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS ................................................................................... 49  
DIAGNOSTIC CHART........................................................................................................................... 49  
RESETTING FROM LOCKOUT ................................................................................................................ 50  
MAINTENANCE ........................................................................................................................................ 50  
ANNUAL INSPECTION ........................................................................................................................... 50  
FILTERS .......................................................................................................................................... 50  
BURNERS ......................................................................................................................................... 50  
INDUCED DRAFT AND CIRCULATOR BLOWERS ............................................................................................ 50  
CONDENSATE TRAP AND DRAIN SYSTEM (QUALIFIED SERVICER ONLY) ........................................................... 51  
FLAME SENSOR (QUALIFIED SERVICER ONLY) .......................................................................................... 51  
FLUE PASSAGES (QUALIFIED SERVICER ONLY) ......................................................................................... 51  
BEFORE LEAVING AN INSTALLATION ............................................................................................................ 51  
REPAIR AND REPLACEMENT PARTS ............................................................................................................ 51  
DIP SWITCHES ........................................................................................................................................ 52  
TROUBLESHOOTING CHART ...................................................................................................................... 53  
STATUS CODES ...................................................................................................................................... 58  
*CVC9_AA, *MVC95_AA ................................................................................................................... 59  
*CVC9_AB, *MVC95_AB .................................................................................................................. 60  
WARNING  
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.  
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SAFETY PRECAUTIONS  
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.  
WARNING  
WARNING  
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.  
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.  
WARNING  
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:  
DO NOT TRY TO LIGHT ANY APPLIANCE.  
DO NOT TOUCH ANY ELECTRICAL SWITCH; DO NOT USE ANY PHONE  
IN YOUR BUILDING.  
IMMEDIATELY CALL YOUR GAS SUPPLIER FROM A NEIGHBORS  
PHONE. FOLLOW THE GAS SUPPLIERS INSTRUCTIONS.  
CARBON MONOXIDE POISONING HAZARD  
Special Warning for Installation of Furnace or Air Handling Units in  
Enclosed Areas such as Garages, Utility Rooms or Parking Areas  
IF YOU CANNOT REACH YOUR GAS SUPPLIER, CALL THE FIRE  
Carbon monoxide producing devices (such as an automobile, space  
heater, gas water heater, etc.) should not be operated in enclosed areas  
such as unventilated garages, utility rooms or parking areas 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 such  
as a garage, utility room or parking area and a carbon monoxide producing  
device is operated therein, there must be adequate, direct outside  
ventilation.  
DEPARTMENT.  
INSTALLATION AND SERVICE MUST BE PERFORMED BY A QUALIFIED  
INSTALLER, SERVICE AGENCY OR THE GAS SUPPLIER.  
WARNING  
THIS PRODUCT CONTAINS OR PRODUCES A CHEMICAL OR CHEMICALS  
WHICH MAY CAUSE SERIOUS ILLNESS OR DEATH AND WHICH ARE  
KNOWN TO THE STATE OF CALIFORNIA TO CAUSE CANCER, BIRTH  
DEFECTS OR OTHER REPRODUCTIVE HARM.  
This ventilation is necessary to avoid the danger of CO poisoning which  
can occur if a carbon monoxide producing device continues to operate in  
the enclosed area. 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.  
WARNING  
-
B10259-216  
HEATING UNIT SHOULD NOT BE UTILIZED WITHOUT REASONABLE,  
ROUTINE, INSPECTION, MAINTENANCE AND SUPERVISION. IF THE  
BUILDING IN WHICH ANY SUCH DEVICE IS LOCATED WILL BE VACANT,  
CARE SHOULD BE TAKEN THAT SUCH DEVICE IS ROUTINELY INSPECTED,  
MAINTAINED AND MONITORED. IN THE EVENT THAT THE BUILDING  
MAYBE EXPOSED TO FREEZING TEMPERATURES AND WILL BE VACANT,  
ALL WATERBEARING 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  
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.  
TEMPERATURES AND WILL BE VACANT, ANY HYDRONIC COIL UNITS  
SHOULD BE DRAINED AS WELL AND, IN SUCH CASE, ALTERNATIVE HEAT  
SOURCES SHOULD BE UTILIZED.  
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PRODUCT DESCRIPTION & APPLICATION  
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  
controlstotheircontainersbeforetouchinganyungrounded  
object.  
SHIPPINGINSPECTION  
All units are securely packed in shipping containers tested ac-  
cording to International SafeTransitAssociation specifications.  
Thecartonmustbecheckeduponarrivalforexternaldamage. If  
damage is found, a request for inspection by carrier’s agent  
must be made in writing immediately.  
TOTHEINSTALLER  
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. Makeanotationondeliveryreceiptofanyvisibledamage  
to shipment or container.  
2. Notify carrier promptly and request an inspection.  
3. Withconcealeddamage, carriermustbenotifiedassoon  
as possible - preferably within five days.  
4. Filetheclaimwiththefollowingsupportdocumentswithin  
a nine month statute of limitations.  
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 pres-  
sure, gas pressures, BTU input rating, proper electrical connec-  
tions, circulating air temperature rise, minimum or maximum CFM,  
and motor speed connections.  
IMPORTANTNOTETOTHEOWNERREGARDINGPRODUCTWAR-  
RANTY  
Your warranty certificate is supplied as a separate document with  
the unit installed by your contractor. Read the limited warranty  
certificate carefully to determine what is and is not covered and  
keep the warranty certificate in a safe place. If you are unable to  
locate the warranty certificate please contact your installing con-  
tractor or contact customer service (877-254-4729) to obtain a  
copy.  
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  
representativeatthetimedamageisreportedtocarrier.  
ToreceivetheLifetimeHeatExchangerLimitedWarranty, goodfor  
as long as you own your home, and the 10-year Parts Limited  
Warranty, online registration must be completed within 60 days of  
installation. Online registration is not required in California or Que-  
bec.  
The carrier is responsible for making prompt inspection of dam-  
age and for a thorough investigation of each claim. The distribu-  
tor or manufacturer will not accept claims from dealers for trans-  
portation damage.  
ToregisteryourGoodmanbrandunit, gotowww.goodmanmfg.com.  
Click on the word “Warranty” located on the left side of the home  
page. Next, click on the word “Product Registration” located on  
the left side of the Warranty page and complete the forms in the  
manner indicated on the Product Registration page.  
ELECTROSTATICDISCHARGE(ESD)PRECAUTIONS  
NOTE: Discharge body’s static electricity before touching unit.  
An electrostatic discharge can adversely affect electrical com-  
ponents.  
Click on the word “Warranty” located on the top right of the home  
page. Next, click on the word “Product Registration” located on  
the left side of the Warranty page and complete the forms in the  
manner indicated on the Product Registration page.  
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 pro-  
cedure is applicable to both installed and non-installed (un-  
grounded)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.). Ifyoucomeincontactwithanungrounded  
object, repeat step 2 before touching control or wires.  
Product limited warranty certificates for models currently in pro-  
hac.com. If your model is not currently in production or does not  
appear on the website, please contact your installing contractor or  
contact customer service at (877-254-4729) to obtain a copy of  
your warranty certificate.  
Each product overview page contains a Product Warranty link; by  
clicking on it you will be able to view the limited warranty coverage  
for that specific product.To view warranty registration information,  
click on the Product Warranty text on the left navigation panel on  
the home page of each website. The Online Product Registration  
pages are located in this same section.  
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PRODUCT DESCRIPTION & APPLICATION  
Dual certification means that the combustion air inlet pipe is op-  
tional and the furnace can be vented as a:  
WARNING  
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,  
TO PREVENT PROPERTY DAMAGE, PERSONAL INJURY OR DEATH DUE TO  
FIRE, DO NOT INSTALL THIS FURNACE IN A MOBILE HOME, TRAILER, OR  
RECREATIONAL VEHICLE.  
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.  
PRODUCT DESCRIPTION  
FEATURES  
This furnace may be used as a construction site heater ONLY if  
all of the following conditions are met:  
This furnace is a part of the ComfortNet™ family of products. The  
CTK01 ComfortNet thermostat kit allows this furnace to be in-  
stalledaspartofadigitallycommunicatingsystem. TheComfortNet  
system provides automatic airflow configuration, 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 “legacy” system using a standard 24 VAC thermostat.  
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.  
A return air temperature range between 60ºF (16ºC) and  
80ºF (27ºC) is maintained.  
This product may also 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.  
Airfiltersareinstalledinthesystemandmaintainedduring  
constructionreplacedasappropriateduringconstruction,  
and upon completion of construction.  
PRODUCTAPPLICATION  
Theinputrateandtemperaturerisearesetperthefurnace  
rating plate.  
100% outside air is provided for combustion air  
requirementsduringconstruction.Temporaryductingcan  
be used.  
This furnace is primarily designed for residential home-heating ap-  
plications. 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).  
NOTE: Do not connect the temporary duct directly to the  
furnace. Theductmustbesizedforadequatecombustion  
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.  
This furnace can be used in the following non-industrial commer-  
cial applications:  
Schools,Officebuildings,Churches,Retailstores,  
The furnace heat exchanger, components, duct system,  
air filters and evaporator coils are thoroughly cleaned  
following final construction clean up.  
Nursinghomes,Hotels/motels,Commonorofficeareas  
In such applications, the furnace must be installed with the follow-  
ing stipulations:  
All furnace operating conditions (including ignition, input  
rate, temperature rise and venting) are verified according  
to these installation instructions.  
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.  
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.  
It must not be used as a “make-up” air unit.  
Itmustbeinstalledwithtwo-pipesystemsforcombustion  
air, especially if VOC’s or other contaminants are present  
in the conditioned space.  
AT-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.  
To ensure proper furnace operation, install, operate and  
maintain the furnace in accordance with these installation  
and operation instructions, all local building codes and or-  
dinances. In their absence, follow the latest edition of the Na-  
tional Fuel Gas Code (NFPA54/ANSI Z223.1), and/or CAN/CSA  
B149 Installation Codes, local plumbing or waste water codes,  
and other applicable codes.  
All other warranty exclusions and restrictions apply This  
furnace is an ETL dual-certified appliance and is  
appropriateforusewithnaturalorpropanegas(NOTE: If  
using propane, a propane conversion kit is required).  
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LOCATION REQUIREMENTS & CONSIDERATIONS  
Acopy of the National Fuel Gas Code (NFPA54/ANSI Z223.1)  
can be obtained from any of the following:  
American National Standards Institute  
1430Broadway  
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.  
New York, NY 10018  
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.  
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.  
National Fire Protection Association  
1 Batterymarch Park  
Quincy, MA 02269  
CSA International  
8501 East Pleasant Valley  
Cleveland, OH44131  
Theratedheatingcapacityofthefurnaceshouldbegreaterthanor  
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 accor-  
dancewithASHRAEGuideorManualJ-LoadCalculationspub-  
lished by theAir Conditioning Contractors ofAmerica.  
A copy of the CAN/CSA B149 Installation Codes can also be  
obtainedfrom:  
CSA International  
178RexdaleBoulevard  
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.  
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:  
permanentwavesolutions  
chlorinated waxes or cleaners  
WARNING  
TO PREVENT POSSIBLE EQUIPMENT DAMAGE, PROPERTY DAMAGE,  
PERSONAL INJURY OR DEATH, THE FOLLOWING BULLET POINTS MUST BE  
OBSERVED WHEN INSTALLING THIS UNIT.  
chlorine-based swimming pool chemicals  
water softening chemicals  
deicing salts or chemicals  
WARNING  
carbon tetrachloride  
halogen type refrigerants  
cleaning solutions (such as perchloroethylene)  
printing inks  
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.  
paintremovers  
varnishes  
hydrochloric acid  
cements and glues  
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.  
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  
enclosednon-directvent furnacehasanadequatesupply  
of combustion air, vent from a nearby uncontaminated  
room or from outdoors. Refer to the Combustion and  
Ventilation Air Requirements for details.  
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 CombustionAir Pipe -Termination  
Locations for appropriate termination locations and to  
determineifthepipingsystemfromfurnacetotermination  
canbeaccomplishedwithintheguidelinesgiven. NOTE:  
The length of flue and/or combustion air piping can be a  
limiting factor in the location of the furnace.  
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LOCATION REQUIREMENTS & CONSIDERATIONS  
TOP  
If the furnace is used in connection with a cooling coil  
TOP  
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.  
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.  
SIDE  
SIDE  
SIDE  
BOTTOM  
Horizontal  
BOTTO M  
Upflow  
Counterflow  
If the furnace is installed horizontally, ensure the access  
doorsarenotontheup/topordown/bottomsideofthe  
furnace.  
Do not connect this furnace to a chimney flue that serves  
a separate appliance designed to burn solid fuel.  
OnCounterflowInstallations, theairconditioningcoilmust  
bedownstreamonthesupply(positive)sideofthefurnace  
heat exchanger.  
Counterflow Installation over a noncombustible floor.  
Beforesettingthefurnaceovertheplenumopening,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  
applicableforyourmodelfordetails.) Aspecialaccessory  
subbase must be used for upright counterflow unit  
installationsoveranycombustiblematerialincludingwood.  
Refertosubbaseinstructionsforinstallationdetails. 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.)  
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 ventila-  
tion openings must be within 12 inches of the top; the other open-  
ing 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.  
FURNACESUSPENSION  
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.  
Thelengthofrodwilldependontheapplicationandtheclearances  
necessary.  
2"X2"X3/8" ANGLE IRON  
(3 PLACES)  
CLEARANCESANDACCESSIBILITY  
Installations must adhere to the clearances to combustible mate-  
rials to which this furnace has been design certified. The minimum  
clearanceinformationforthisfurnaceisprovidedontheunit’sclear-  
ance label. These clearances must be permanently maintained.  
Clearances must also accommodate an installation’s gas, electri-  
cal, 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.  
RefertoVent/FluePipeandCombustionAirPipefordetails. 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.  
EXISTINGFURNACEREMOVAL  
NOTE: When an existing furnace is removed from a venting sys-  
tem serving other appliances, the venting system may be too large  
to properly vent the remaining attached appliances.  
The following vent testing procedure is reproduced from theAmerican  
NationalStandard/NationalStandardofCanadaforGas-FiredCentral  
FurnacesANSI Z21.4, CSA-2.3 latest edition Section 1.23.1.  
The following steps shall be followed with each appliance connected to  
the venting system placed in operation, while any other appliances  
connected to the venting system are not in operation:  
1. Seal any unused openings in the venting system;  
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COMBUSTION & VENTILATION AIR REQUIREMENTS  
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.  
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. MOST HOMES REQUIRE OUTSIDE AIR BE  
SUPPLIED INTO THE FURNACE AREA.  
4. Close fireplace dampers.  
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 maxi-  
mum 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 com-  
bustion 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.  
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.  
Housedepressurizationcancausebackdraftingorimpropercom-  
bustion of gas-fired appliances, thereby exposing building occu-  
pants to gas combustion products that could include carbon mon-  
oxide.  
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 CodeANSI Z223.1/NFPA54 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 appli-  
cable 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 out-  
lined above, return doors, windows, exhaust fans, fireplace  
dampers and any other gas burning appliance to their previ-  
ous 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 connec-  
tions. Refer to “Recommended Installation Positions” figure for  
appropriate installation positions, ductwork connections, and re-  
sulting airflow arrangements.  
THERMOSTATLOCATION  
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 influ-  
enced 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.  
Light fixtures or other appliances.  
Radiant heat from a fireplace.  
Concealed hot or cold water pipes, or chimneys.  
10  
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HORIZONTAL APPLICATIONS & CONSIDERATIONS  
When using the horizontal alternate vent configuration, you must  
use the RF000142 vent drain kit. See following illustration.  
HORIZONTAL APPLICATIONS & CONSIDERATIONS  
Horizontal applications, in particular, may dictate many of the  
installation’s specifics such as airflow direction, ductwork connec-  
tions, flue and combustion air pipe connections, etc. The basic  
applicationofthisfurnaceasahorizontalfurnacediffersonlyslightly  
from an upright installation. When installing a furnace horizontally,  
VENT-DRAIN  
“FIELD-SUPPLIED DRAIN  
HOSE” FROM VENT-  
DRAIN CONNECTED TO  
CONDENSATE DRAIN  
LINE WITH “FIELD-  
SUPPLIED CONNECTOR”  
additional consideration must be given to the following:  
FURNACE MUST BE LEVEL  
FROM END TO END  
ALTERNATE VENT/FLUE  
FURNACE MUST BE LEVEL  
AND COMBUSTION AIR  
OR SLIGHTLY TILTED FORWARD  
INTAKE LOCATIONS  
WITH THE DOORS 0" - 3/4"  
BELOW THE BACK PANEL  
NOTE: MAKE SMALL  
LOOP IN HOSE TO  
SERVE AS “P-TRAP”  
4 3/4" MINIMUM  
DRAIN TRAP  
CLEARANCE  
GAS LINE WITH  
DRIP LEG (3" MINIMUM)  
AlternateVent/FlueLocation  
DRAIN LINE WITH 1/4" PER FOOT  
DOWNWARD SLOPE  
DRAIN PAN  
36" MINIMUM SERVICE  
CLEARANCE REQUIRED  
FURNACE MUST BE SUPPORTED  
AT BOTH ENDS AND MIDDLE  
HorizontalFurnace  
DRAINTRAPANDLINES  
In horizontal applications the condensate drain trap is secured to  
the furnace side panel, suspending it below the furnace. A mini-  
mum clearance of 4 3/4 inches below the furnace must be pro-  
vided 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 de-  
tails. If the drain trap and drain line will be exposed to temperatures  
near or below freezing, adequate measures must be taken to pre-  
vent condensate from freezing.  
LEVELING  
Leveling ensures proper condensate drainage from the heat ex-  
changer and induced draft blower. For proper flue pipe drainage,  
the furnace must be level lengthwise from end to end. The furnace  
should also be level from back to front or have a slight tilt with the  
access doors downhill (approximately 3/4 inches) from the back  
panel. The slight tilt allows the heat exchanger condensate, gen-  
erated in the recuperator coil, to flow forward to the recuperator coil  
frontcover.  
ALTERNATEVENT/FLUEANDCOMBUSTIONAIRCONNECTIONS  
In horizontal installations provisions for alternate flue and combus-  
tion air piping are available for upflow furnaces with left discharge  
and counterflow furnaces with right air discharge. This configura-  
tion allows the flue and combustion air piping to be run vertically  
through the side of the furnace. Refer to the “Recommended In-  
stallation 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 connec-  
tions.  
RecommendedInstallationPositions  
NOTE: Alternate “vertical” piping connections can not be used  
when an upflow furnace is installed with supply air discharging to  
the right, or when a counterflow furnace is installed with supply air  
discharging to the left. In either case, use the standard flue and  
combustion air piping connections.  
11  
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PROPANE GAS/HIGH ALTITUDE INSTALLATIONS  
Contact the distributor for a tabular listing of appropriate  
ALTERNATEELECTRICALANDGASLINECONNECTIONS  
manufacturer’s kits for propane gas and/or high altitude installa-  
tions. The indicated kits must be used to insure safe and proper  
furnace operation. All conversions must be performed by a quali-  
fied installer, or service agency.  
Thisfurnacehasprovisionsallowingforelectricalandgaslinecon-  
nections through either side panel. In horizontal applications the  
connections can be made either through the “top” or “bottom” of  
the furnace.  
VENT/FLUE PIPE & COMBUSTION AIR PIPE  
DRAINPAN  
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).  
WARNING  
FAILURE TO FOLLOW THESE INSTRUCTIONS CAN RESULT IN BODILY  
INJURY OR DEATH. CAREFULLY READ AND FOLLOW ALL INSTRUCTIONS  
GIVEN IN THIS SECTION.  
FREEZEPROTECTION  
Refer to HorizontalApplications and Conditions - Drain Trap and  
Lines.  
WARNING  
UPON COMPLETION OF THE FURNACE INSTALLATION, CAREFULLY  
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  
EXPOSURE TO FLUE PRODUCTS, INCLUDING CARBON MONOXIDE.  
FURNACESUSPENSION  
If the furnace is installed in a crawl space it must be suspended  
from the floor joist or supported by a concrete pad. Never install  
the furnace on the ground or allow it to be exposed to water. Refer  
to Location Requirements and Considerations - Furnace Suspen-  
sion for further details.  
A condensing gas furnace achieves its high level of efficiency by  
extracting almost all of the heat from the products of combustion  
and cooling them to the point where condensation takes place.  
Because of the relatively low flue gas temperature and water con-  
densation requirements, PVC pipe is used as venting material.  
PROPANE GAS/HIGH ALTITUDE INSTALLATIONS  
WARNING  
This furnace must not be connected to Type B, BW, or L vent or  
vent connector, and must not be vented into any portion of a fac-  
tory built or masonry chimney except when used as a pathway for  
PVC as described later in this section. Never common vent this  
appliance with another appliance or use a vent which is used by a  
solid fuel appliance. Do not use commercially available “no hub  
connectors” other than those shipped with this product.  
POSSIBLE 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 differ-  
ence between natural and propane gas.  
It is the responsibility of the installer to follow the manufacturers’  
recommendationsandtoverifythatallvent/fluepipingandconnec-  
tors are compatible with furnace flue products. Additionally, it is  
the responsibility of the installer to ensure that all piping and con-  
nections possess adequate structural integrity and support to pre-  
ventfluepipeseparation, shifting, orsaggingduringfurnaceopera-  
tion.  
High altitude installations may require both a pressure switch and  
an orifice/spring change. These changes are necessary to com-  
pensate for the natural reduction in the density of both the gas fuel  
and the combustion air at higher altitude.  
DUALCERTIFICATION:NON-DIRECT/DIRECTVENT  
For installations above 7000 feet, please refer to your distributor  
for required kit(s).  
This furnace is dual certified and may be installed as a non-direct  
vent (single pipe) or direct vent (dual pipe) appliance. Anon-direct  
vent installation requires only a vent/flue pipe, while a direct vent  
installation requires both a vent/flue pipe and a combustion air  
intake pipe. Refer to the appropriate section for details concerning  
piping size, length, number of elbows, furnace connections, and  
terminations.  
M anifold P ressure  
P ressure  
Switch  
Change  
Gas  
Altitude  
Kit  
Orifice  
High  
Low  
Stage  
Stage  
Natural  
None  
#43  
#55  
3.5" w.c.  
1.9" w.c.  
None  
None  
0-7000  
LPM -05* 1  
LPM -06* 2  
Propane  
10.0" w.c.  
6.0" w.c.  
1 LPM-05*supports White-Rodgers 2-stage valve only  
2 LPM-06* supports both Honeywell and White-Rodgers 2-stage valves  
NOTE: In Canada, gas furnaces are onlycertified to 4500 feet.  
12  
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VENT/FLUE PIPE & COMBUSTION AIR PIPE  
Piping must be adequately secured and supported to prohibit sag-  
ging, joint separation, and/or detachment from the furnace. Hori-  
zontalrunsofvent/fluepipingmustbesupportedeverythreetofive  
feet and must maintain a 1/4 inch per foot downward slope, back  
WARNING  
TO AVOID BODILY INJURY, FIRE OR EXPLOSION, SOLVENT CEMENTS  
MUST BE KEPT AWAY FROM ALL IGNITION SOURCES  
(I.E., SPARKS, OPEN  
towardsthefurnace, toproperlyreturncondensatetothefurnace’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.  
FLAMES, AND EXCESSIVE HEAT) AS THEY ARE COMBUSTIBLE LIQUIDS.  
AVOID BREATHING CEMENT VAPORS OR CONTACT WITH SKIN AND/OR  
EYES.  
Two- or three-inch nominal diameter PVC Schedule 40 pipe meet-  
ing ASTM D1785, PVC primer meeting ASTM F656, and PVC  
solventcementmeetingASTMD2564specificationsmustbeused.  
Fittings must be DWV type fittings meeting ASTM D2665 and  
ASTM D3311. Carefully follow the pipe manufacturer’s instruc-  
tions for cutting, cleaning, and solvent cementing of PVC.  
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.  
The use of Schedule 40 PVC Cellular Core (Foam Core) plastic  
pipe is also acceptable as a flue/vent and intake pipe material.  
PVC primer meetingASTM F656 and PVC solvent cement meet-  
ing ASTM D2564 specifications must be used. Fittings must be  
DWV type fittings meetingASTM D2665 andASTM D3311. Care-  
fully follow the manufactures instructions for cutting, cleaning and  
solvent cementing of PVC.  
TERMINATIONLOCATIONS  
NOTE: Refer to Location Requirements and Considerations for  
combustion air contaminant restrictions.  
The following bullets and diagram describe the restrictions con-  
cerning the appropriate location of vent/flue pipe and combustion  
airintakepipe(whenapplicable)terminations. RefertoNon-Direct  
Vent (Single Pipe) Piping and Direct Vent (Dual Pipe) Piping lo-  
cated in this section for specific details on termination construc-  
tion.  
MATERIALSANDJOININGMETHODS  
As an alternative to PVC pipe, primer, solvent cement, and fittings,  
ABS materials which are in compliance with the following specifi-  
cations may be used. Two-or-three-inch ABS Schedule 40 pipe  
must meet ASTM D1527 and, if used in Canada, must be CSA  
listed. Solvent cement for ABS to ABS joints must meet ASTM  
D2235 and, if used in Canada, must be CSA listed. The solvent  
cementforthePVCtoABStransitionjointmustmeetASTMD3138.  
Fittings must be DWV type fittings meeting ASTM D2661 and  
ASTM D3311 and, if used in Canada, must be CSAlisted. Care-  
fully follow the manufacturers’ instructions for cutting, cleaning,  
and solvent cementing PVC and/orABS.  
All terminations (flue and/or intake) must be located at  
least12inchesabovegroundlevelortheanticipatedsnow  
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.  
All 90° elbows must be medium radius (1/4 bend DWV) or long  
radius (Long sweep 1/4 bend DWV) types conforming toASTM  
D3311. Amedium 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.  
Theventterminationofanon-directventapplicationmust  
terminate at least 4 feet below, 4 feet horizontally from,  
or 1 foot above any door, window, or gravity air inlet into  
any building.  
The vent termination of a direct vent application must  
terminate at least 12 inches from any opening through  
which flue gases may enter a building (door, window, or  
gravity air inlet).  
The vent termination of vent pipe run vertically through a  
roof must terminate at least 12 inches above the roof line  
(or the anticipated snow level) and be at least 12 inches  
from any vertical wall (including any anticipated snow  
buildup).  
Aventterminationshallnotterminateoverpublicwalkways  
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.  
PROPERVENT/FLUEANDCOMBUSTIONAIRPIPINGPRACTICES  
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.  
13  
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VENT/FLUE PIPE & COMBUSTION AIR PIPE  
Non-Direct Vent  
vicing. CombustionAir and Vent piping should be routed in a man-  
&
ner to avoid contact with refrigerant lines, metering devices, con-  
densate drain lines, etc. If necessary, clearances may be in-  
creased by utilizing two 45 deg. Long-Sweep Elbows and creat-  
ing an “S” joint to provide additional space at connection loca-  
tions. This joint can be rotated on the fitting to establish maxi-  
mum 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.  
Direct Vent  
Vent/Flue Terminations  
Non-Direct Vent  
Vent/Flue Termination  
No Terminations  
Above Walkway  
<10'  
4' min.  
12"  
3' min.  
4'  
min.  
12"  
min.  
Grade or Highest  
Anticipated  
Snow Level  
12" min.  
Non-Direct Vent  
Vent/Flue Termination  
12" min.  
Forced Air  
Inlet  
V
E
N
T
Direct Vent  
Vent/Flue Termination  
45 DEGREE  
LONG-SWEEP  
ELBOWS  
Vent Termination Clearances  
NOTE: InCanada,theCanadianFuelGasCodetakesprecedence  
over the preceding termination restrictions.  
CANADIANVENTINGREQUIREMENTS  
In Canada, venting must conform to the requirements of the cur-  
rent CAN/CSA-B149.1-05 Installation Code. Use only CSA-listed,  
ULC-S636complianttwo-orthree-inchdiameterPVCorABSpipe,  
solventcement, andfittingsthroughout. Thecertifiedpipingshould  
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/orABS.  
IncreasedClearanceConfiguration  
NOTE: Do not use other commercially available “no hub connec-  
tors” due to possible material conflicts. The vent/flue pipe can also  
be secured using a PVC or ABS elbow or coupling using the  
appropriate glue (see Materials and Joining Methods).  
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.  
The vent can be run through an existing unused chimney provided  
the space between the vent pipe and the chimney is insulated and  
closed with a weather-tight, corrosion-resistant flashing.  
COMBUSTION AIR PIPE  
STANDARDFURNACECONNECTIONS  
DIRECTVENT INSTALLATIONS  
It is the responsibility of the installer to ensure that the piping  
connections to the furnace are secure, airtight, and adequately  
supported.  
On upflow units secure the combustion air intake pipe directly to  
the air intake coupling. On counterflow units secure the combus-  
tion air intake pipe to the air intake coupling using the rubber cou-  
plingandwormgearhoseclampsprovidedwiththeunit. Thecoun-  
terflow rubber coupling allows service removal of air intake piping  
internal to the furnace blower compartment. NOTE: Because of  
probable material conflicts, do not use other commercially avail-  
able “no hub connectors”. The combustion air intake pipe can  
also be secured directly to the counterflow unit air intake pipe  
coupling.  
As shipped, attachment “couplings” for vent/flue and combustion  
air intake pipe connections are provided on the furnace’s top cover  
(upflow) or basepan (counterflow). To use the standard connec-  
tions, field supplied vent/flue pipe and combustion air intake pipe  
(when applicable) should be secured directly to the furnace at  
these locations.  
VENT/FLUEPIPE  
NON-DIRECTVENT INSTALLATIONS  
Vent/flue pipe can be secured to the vent/flue coupling using the  
rubber coupling and worm gear hose clamps provided with this  
furnace (see “Standard Connections” figure). The rubber coupling  
allows separation of the vent/flue pipe from the furnace during ser-  
A minimum of one 90° elbow should be installed on the combus-  
tion air intake “coupling” to guard against inadvertent blockage.  
14  
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VENT/FLUE PIPE & COMBUSTION AIR PIPE  
COMBUSTION  
AIR PIPE  
VENT/FLUE  
PIPE  
COMBUSTION  
AIR PIPE  
4. Cut the vent/flue pipe 3.75 inches from the flanged end of  
the pipe (see “Vent/Flue Pipe Cuts” figure).The section of  
pipe attached to the coupling will reach through the side  
panel to the induced draft blower. Discard remaining pipe  
and elbows.  
VENT/FLUE  
PIPE  
(DIRECT VENT ONLY)  
(DIRECT VENT ONLY)  
90 PVC  
ELBOW  
RUBBER  
90 PVC  
ELBOW  
(NON-DIRECT VENT)  
RUBBER  
COUPLING  
WITH WORM  
GEAR CLAMPS  
COUPLINGS  
WITH WORM  
GEAR CLAMPS  
(NON-DIRECT VENT)  
OR  
OR  
Counterflowunits.  
Cut the vent/flue pipe 3.75 inches from the blower deck  
coupling (see “Vent/Flue Pipe Cuts” figure).Save vent/flue  
pipeattachedtoblowerdeckcouplingforuseinthealternate  
location. Discard remaining pipe and elbows.  
FLANGE  
UPFLOW  
COUNTERFLOW  
3.75"  
Standard Connections  
CUT HERE  
ALTERNATEFURNACECONNECTIONS  
If the standard locations are undesirable for a specific installation,  
alternate side panel locations are available for both combustion air  
inlet and vent/flue pipe connections. These locations may be of  
particular benefit to upright upflow installations requiring additional  
access to an Acoil, or to upright counterflow installations requiring  
additional access to a filter or electronic air cleaner, or to horizontal  
installations desiring vent/flue (and combustion air intake) piping  
run vertically from the side of the cabinet.  
Vent/FluePipeCuts  
5. Remove plastic plug from alternate vent/flue location.  
Relocate and install plug in standard vent/flue location (top  
cover).  
NOTE: Standard and alternate locations can be combined (i.e.,  
an installation may use the standard combustion air intake loca-  
tionbutusethealternatevent/fluelocationorviceversa), ifneeded.  
Counterflow units.  
Remove plastic plug from alternate vent/flue location.  
Relocate and install plug in standard vent/flue location  
(basepan). Plug remaining hole in blower deck with plastic  
plug included in the drain kit bag.  
WARNING  
EDGES OF SHEET METAL HOLES MAY BE SHARP. USE GLOVES AS A  
PRECAUTION WHEN REMOVING HOLE PLUGS.  
6. Upflow andCounterflow units.  
Insertcutsectionofvent/fluepipeandcouplingintoalternate  
vent/flue location. Using a rubber coupling and worm gear  
hose clamps from the drain kit bag, attach the vent/flue  
pipe and coupling to the induced draft blower. Secure the  
coupling to the cabinet using the screws removed in step 1  
or with field-supplied 3/8” #8 self drilling screws.  
ALTERNATEVENT/FLUELOCATION  
The alternate vent/flue location is the large hole directly in line with  
the induced draft blower outlet. To use the alternate vent/flue loca-  
tion refer to the following steps and the “Alternate Vent/Flue Loca-  
tionfigure.  
WARNING  
NOTE: Counterflow instructions follow the upflow instructions.  
THE RUBBER ELBOW IS NOT DESIGNED TO SUPPORT A LOAD. WHEN THE  
RUBBER ELBOW IS MOUNTED EXTERNALLY TO THE FURNACE CABINET,  
EXTREME CARE MUST BE TAKEN TO ADEQUATELY SUPPORT FIELD‐  
SUPPLIED VENT/FLUE PIPING, AS DAMAGE CAN RESULT IN LEAKS  
CAUSING BODILY INJURY OR DEATH DUE TO EXPOSURE TO FLUE GASES,  
INCLUDING CARBON MONOXIDE  
1. Remove and save the four screws securing the vent/flue  
coupling to the furnace top panel.  
Counterflow units.  
Remove and save the four screws securing the vent/flue  
coupling to the furnace basepan. Also remove the three  
screws securing the furnace’s internal vent/flue piping to  
the blower deck.  
7. Upflow andCounterflow units.  
2. Upflow andCounterflow units.  
For upright installations, externally mount the rubber  
elbow to the vent/flue coupling using a worm gear hose  
clamp. Secure field supplied vent/flue piping to the rubber  
elbow using a worm gear hose clamp. NOTE: Use of the  
alternate vent/flue location for upright installations, requires  
the drain trap be installed on the same side of the unit as  
the flue pipe.  
Loosen the worm gear hose clamps on the rubber elbow  
and detach it from both the induced draft blower and the  
vent/fluepipe.  
3. Upflow andCounterflow units.  
Remove the vent/flue pipe from the furnace.  
15  
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VENT/FLUE PIPE & COMBUSTION AIR PIPE  
8. Upflow andCounterflow units.  
3. Remove plastic plug from alternate combustion air intake  
location. Relocate and install plug in standard air intake  
location (basepan). Plug the remaining hole in the blower  
deck with the plastic plug included in the drain kit bag.  
4. With the gasket facing the cabinet side panel, and the  
flange’s flat spot facing forward, secure the combustion air  
intake coupling to the cabinet using the screws removed in  
step 1 or with field-supplied 3/8” #8 self -drilling screws.  
For horizontal installations, externally secure the field-  
suppliedvent/fluepipedirectlytothevent/fluecouplingusing  
a PVC orABS coupling or elbow.  
ALTERNATECOMBUSTIONAIRINTAKELOCATION  
The alternate combustion air intake location consists of a large,  
unobstructed hole (alternate vent connection is aligned with the  
Induced Draft Blower). To use the alternate combustion air intake  
location, refer to the following steps, and the “Alternate Combus-  
tionAir Intake Location” figure.  
CAUTION  
BE SURE NOT TO DAMAGE INTERNAL WIRING OR OTHER COMPONENTS  
WHEN REINSTALLING COUPLING AND SCREWS.  
1. Removeandsavethefourscrewssecuringthecombustion  
air intake coupling to the basepan. Remove an additional  
three screws securing the furnace’s internal combustion  
air intake pipe to the blower deck.  
2. Remove the combustion air intake pipe from the furnace  
andcutthepipeatthebasepancoupling. Savethebasepan  
coupling and gasket from the blower deck coupling for use  
in the alternate location. Discard the remaining pipe.  
5. For non-direct vent installations installed horizontally, a  
minimum of one 90° elbow should be installed on the  
combustionairintake couplingtoguardagainst inadvertent  
blockage. Noelbowisrequiredonthealternatecombustion  
air intake of upright installations, however, a minimum  
clearanceof2inchesisrequiredtoassureproperairsupply.  
6. For direct vent installations, secure field-supplied  
combustionairintakepipedirectlytotheairintakecoupling.  
NOTE: APVCcouplingorelbowisrequiredoncounterflow  
units.  
3
3
REMOVE  
PIPE  
REMOVE  
PIPE  
1
REMOVE  
3 SCREWS  
5
5
REMOVE  
REMOVE  
AND RELOCATE  
AND RELOCATE  
2
2
DETACH RUBBER  
ELBOW FROM  
ID BLOWER AND  
VENT/FLUE  
PIPE  
DETATCH RUBBER  
ELBOW FROM  
ID BLOWER AND  
VENT/FLUE  
PIPE  
5
ADDITIONAL PLUG  
FROM DRAIN KIT  
6
SECURE TO  
ID BLOWER WITH  
6
RUBBER COUPLING  
SECURE TO  
AND HOSE  
CABINET WITH  
CLAMPS  
7
EXTERNALLY  
MOUNT  
SCREWS  
RUBBER ELBOW  
6
SECURE TO  
ID BLOWER WITH  
RUBBER COUPLING  
AND HOSE  
CLAMPS  
16  
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VENT/FLUE PIPE & COMBUSTION AIR PIPE  
1) One 90° elbow should be secured to the combustion air intake connection.  
NON-DIRECTVENT(SINGLEPIPE)PIPING  
2) Minimum requirement for each vent pipe is five (5) feet in length and one  
Non-direct ventinstallations require only a vent/flue pipe. The vent  
pipe can be run horizontally with an exit through the side of the  
building or run vertically with an exit through the roof of the building.  
The vent can also be run through an existing unused chimney;  
however, it must extend a minimum of 12 inches above the top of  
the chimney. The space between the vent pipe and the chimney  
must be closed with a weather-tight, corrosion-resistant flashing.  
For details concerning connection of the vent/flue pipe to the fur-  
nace, refer to Vent/Flue Pipe and Combustion Air - Standard Fur-  
nace Connections or Alternate Furnace Connections for specific  
details. Refer to the followingNon-Direct Vent (Single Pipe) Piping  
- Vent/Flue Pipe Terminations for specific details on termination  
construction.  
elbow/tee.  
3) Tee used in the vent/flue termination must be included when determining the  
number of elbows in the piping system.  
4) 2-1/2” or 3” diameter pipe can be used in place of 2” diameter pipe.  
5) Increased Clearance Configurations using (2) 45 deg. Long Sweep el-  
bows should be considered equivalent to one 90 deg. elbow.  
VENT/FLUEPIPE TERMINATIONS  
The vent/flue pipe may terminate vertically, as through a roof, or  
horizontally, as through an outside wall.  
Vertical vent/flue pipe terminations should be as shown in the fol-  
lowing 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.  
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  
alternateairintakelocation. Thiselbowwillguardagainstinadvert-  
ent blockage of the air intake.  
Horizontal 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.  
A 2 3/8” diameter wall penetration is required for 2” diameter pipe.  
A 3” diameter hole is required for a 2 1/2” pipe and a 3 1/2” diam-  
eter hole is required for 3” diameter pipe. To secure the pipe pass-  
ing 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.  
VENT/FLUE PIPE LENGTHS AND DIAMETERS  
Refer to the following table for applicable length, elbows, and pipe  
diameter for construction of the vent/flue pipe system of a non-  
direct vent installation. In addition to the vent/flue pipe, a single 90°  
elbow should be secured to the combustion air intake to prevent  
inadvertent blockage. The tee used in the vent/flue termination  
must be included when determining the number of elbows in the  
piping system.  
UPFLOW  
Non-Direct Vent (Single Pipe)  
Maximum Allowable Length of Vent/Flue Pipe (ft) (1)(2)  
Pipe (4)  
Number of Elbows (3)(5)  
Unit  
Input  
(Inch)  
1
2
3
4
5
6
7
8
45,000 2 or 2 1/2 71  
68 65 62 59 56 53 50  
46 43 40 37 34 31 28  
68 65 62 59 56 53 50  
68 65 62 59 56 53 50  
46 43 40 37 34 31 28  
2 or 2 1/2 49  
70,000  
3
3
3
71  
71  
49  
90,000  
115,000  
COUNTERFLOW  
Non-Direct Vent (Single Pipe)  
Maximum Allowable Length of Vent/Flue Pipe (ft) (1)(2)  
Pipe (4)  
(Inch)  
Number of Elbows (3)(5)  
Unit  
Input  
1
2
3
4
5
6
7
8
2 or 2 1/2 61  
58 55 52 49 46 43 40  
68 65 62 59 56 53 50  
58 55 52 49 46 43 40  
68 65 62 59 56 53 50  
68 65 62 59 56 53 50  
70,000  
3
71  
2 or 2 1/2 61  
90,000  
3
3
71  
71  
115,000  
17  
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VENT/FLUE PIPE & COMBUSTION AIR PIPE  
In a basement installation, the vent/flue pipe can be run between  
joist spaces. If the vent pipe must go below a joist and then up into  
the last joist space to penetrate the header, two 45° elbows should  
be used to reach the header rather than two 90° elbows.  
TEE (OPTIONAL)  
DIRECTVENT(DUALPIPE)PIPING  
The inlet air screens provided in the installation instruction packet  
are available for the installer to use in the inlet of the combustion air  
pipe to prevent animals from building nests in the combustion air  
pipe. Installation of screens, while strongly recommended, is not  
required and will not affect performance of the unit.  
12 " Min To Roof  
Or Highest Anticipated  
Snow Level  
12 " Min To Roof  
Or Highest Anticipated  
Snow Level  
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 resis-  
tant 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 Loca-  
tions or Concentric Vent Termination for specific details on termi-  
nation construction. For details concerning connection of pipes to  
the furnace, refer to the Vent/Flue Pipe and Combustion Pipe -  
StandardFurnaceConnectionsorAlternateFurnaceConnections.  
Vertical Termination (Single Pipe)  
90º  
MEDIUM RADIUS  
ELBOWS  
12" MIN. TO ROOF  
OR HIGHEST ANTICIPATED  
SNOW LEVEL  
VENT/FLUE &COMBUSTION AIR PIPE LENGTHS &DIAMETERS  
Refer to the following table for applicable length, elbows, and pipe  
diameterforconstructionofthevent/flueandcombustionairintake  
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 & CombustionAir Intake) pipe. Elbows and/or  
tees used in the terminations must be included when determining  
the number of elbows in the piping systems.  
Alternate Vertical Termination (Single Pipe)  
If the combustion air intake pipe is to be installed above a finished  
ceiling or other area where dripping of condensate will be objec-  
tionable, insulation of the combustion air pipe may be required.  
Use 1/2” thick closed cell foam insulation such as Armaflex™ or  
Insultubewhererequired.  
MIN.  
12"  
12" TO GROUND OR  
FROM  
WALL  
HIGHEST ANTICIPATED  
SNOW LEVEL  
VENT/FLUE AND COMBUSTION AIR PIPE TERMINATIONS  
HorizontalTermination(SinglePipe)  
12" MIN.  
Thevent/flueandcombustionairpipesmayterminatevertically, as  
through a roof, or horizontally, as through an outside wall.  
VENT/FLUE TEE  
or  
90° ELBOW TURNED  
DOWN  
12" MIN. ABOVE  
HIGHEST ANTICIPATED  
SNOW LEVEL  
HorizontalTermination(SinglePipe)  
AboveHighestAnticipatedSnowLevel  
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VENT/FLUE PIPE & COMBUSTION AIR PIPE  
TEE (OPTIONAL)  
UPFLOW  
Direct Vent (Dual Pipe) Maximum Allowable Length*  
of Vent/Flue & Combustion Air Intake Pipe(ft)  
VENT/FLUE  
Number of Elbows (1)(2)(3)(5)  
COMBUSTION  
AIR INTAKE  
Pipe(4)  
(inch)  
Unit Input Termination  
(Btu)  
Style  
1
2
3
4
5
6
7
8
12" MIN.  
Standard 2 or 2 1/2 71 68 65 62  
59 56 53 50  
46 43 40 37  
37 34 31 28  
59 56 53 50  
24 21 18 15  
45 42 39 36  
59 56 53 50  
45 42 39 36  
37 34 31 28  
23 20 17 14  
45,000  
Alternate  
2 or 2 1/2 58 55 52 49  
2 or 2 1/2 49 46 43 40  
SCREEN  
Standard  
3
71 68 65 62  
70,000  
2 or 2 1/2 36 33 30 27  
Alternate  
3
3
3
3
3
57 54 51 48  
71 68 65 62  
57 54 51 48  
49 46 43 40  
35 32 29 26  
Standard  
Alternate  
Standard  
Alternate  
90,000  
12" MIN. TO ROOF  
OR HIGHEST ANTICIPATED  
SNOW LEVEL  
115,000  
VENT/FLUE  
*Maximum allowable limits listed are individual lengths for inlet & flue and NOT a combination.  
COUNTERFLOW  
Direct Vent (Dual Pipe) Maximum Allowable Length*  
12" MIN.  
of Vent/Flue & Combustion Air Intake Pipe(ft)  
Number of Elbows (1)(2)(3)(5)  
Pipe(4)  
Unit Input Termination  
SCREEN  
(Btu)  
Style  
(inch)  
2 or 2 1/2 49 46 43 40  
71 68 65 62  
2 or 2 1/2 36 33 30 27  
57 54 51 48  
2 or 2 1/2 61 58 55 52  
71 68 65 62  
2 or 2 1/2 48 45 42 39  
1
2
3
4
5
6
7
8
37 34 31 28  
59 56 53 50  
24 21 18 15  
45 42 39 36  
49 46 43 40  
59 56 53 50  
36 33 30 27  
45 42 39 36  
Standard  
3
70,000  
Alternate  
Standard  
Alternate  
12" MIN. TO ROOF  
OR HIGHEST ANTICIPATED  
SNOW LEVEL  
3
3
Vertical Terminations (Dual Pipe)  
90,000  
Horizontal terminations should be as shown in the following figure.  
Refer to Vent/Flue Pipe and Combustion Pipe - Termination Loca-  
tion for location restrictions. A2 3/8” diameter wall penetration is  
required for 2” diameter pipe. A3” diameter hole is required for a 2  
1/2” pipe and a 3 1/2” diameter hole is required for 3” diameter  
pipe. To secure the pipe passing through the wall and prohibit  
damage to piping connections, a coupling should be installed on  
either side of the wall and solvent cemented to a pipe connecting  
the two couplings. The pipe length should be the wall thickness  
plus the depth of the socket fittings to be installed on the inside  
and outside of the wall. The wall penetration should be sealed with  
silicone caulking material.  
3
57 54 51 48  
Standard  
Alternate  
3
3
71 68 65 62  
57 54 51 48  
59 56 53 50  
45 42 39 36  
115,000  
*Maximum allowable limits listed are individual lengths for inlet & flue and NOT a combination.  
1) Elbows and/or tees used in terminations must be included when determin-  
ing quantity of allowable elbows in the system.  
2) Number of elbows tabulated are for each (Vent/Flue & Combustion Air  
Intake) pipe.  
3) Minimum requirements for each Vent/Flue & Combustion Air Intake pipe is  
five (5) feet in length and one elbow/tee.  
4) 2 1/2” or 3” diameter pipe can be used in place of 2” diameter pipe.  
12" MIN  
5) Increased Clearance Configurations using (2) 45 deg. Long Sweep el-  
bows should be considered equivalent to one 90 deg. elbow.  
3" MIN  
24" MAX  
Vertical pipe terminations should be as shown in the following  
figure. Refer to Vent/Flue Pipe and Combustion Pipe - Termina-  
tion 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.  
3" MIN  
24" MAX  
90º  
12" MIN. TO ROOF OR  
HIGHEST ANTICIPATED  
SNOW LEVEL  
MEDIUM RADIUS  
ELBOW  
SCREEN  
12" MIN. TO ROOF OR  
HIGHEST ANTICIPATED  
SNOW LEVEL  
Standard Horizontal Terminations (Dual Pipe)  
19  
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VENT/FLUE PIPE & COMBUSTION AIR PIPE  
90º MEDIUM  
RADIUS ELBOW  
VENT/INTAKETERMINATIONSFORINSTALLATIONOFMULTIPLE  
DIRECTVENTFURNACES  
12” MIN  
If more than one direct vent furnace is to be installed vertically  
through a common roof top, maintain the same minimum clear-  
ances between the exhaust vent and air intake terminations of  
adjacent units as with the exhaust vent and air intake terminations  
of a single unit.  
MAX  
MIN  
2
AIR  
INTAKE  
If more than one direct vent furnace is to be installed horizontally  
through a common side wall, maintain the clearances as in the  
following figure. Always terminate all exhaust vent outlets at the  
same elevation and always terminate all air intakes at the same  
elevation.  
12" MIN. TO ROOF OR  
HIGHEST ANTICIPATED  
SNOW LEVEL  
SCREEN  
AlternateHorizontalVentTermination(DualPipe)  
12" MIN  
Vents  
90°  
Medium  
Radius  
Elbows  
3" MIN  
24" MAX  
SUPPORT  
STRAPS  
VENT/FLUE  
TEE  
3" Min.  
24" Max.  
3" Min.  
24" Max.  
3" Min.  
24" Max.  
COMBUSTION  
AIR INTAKE  
Air  
Intakes  
12" MIN. ABOVE  
HIGHEST ANTICIPATED  
SNOW LEVEL  
Screen  
SCREEN  
12" Min.  
12" MIN. ABOVE  
HIGHEST ANTICIPATED  
SNOW LEVEL  
12" MIN. ABOVE  
HIGHEST ANTICIPATED  
SNOW LEVEL  
90° MEDIUM  
RADIUS ELBOWS  
HorizontalVentingOfMultipleUnits  
CONCENTRICVENTTERMINATION  
RefertothedirectionsprovidedwiththeConcentricVentKit(DCVK)  
for installation specifications.  
StandardHorizontalTerminationsAboveAnticipatedSnow  
Level(DualPipe)  
SIDE WALL VENT KIT  
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. This kit is NOT intended for use with single pipe  
(indirect vent) installations.  
SCREEN  
Refer to the directions furnished with the Side Wall Vent Kit  
(p/n0170K00000S) forinstallationspecifications.  
12" MIN. TO ROOF OR  
HIGHEST ANTICIPATED  
SNOW LEVEL  
AlternateVentTerminationAboveAnticipatedSnowLevel  
(DualPipe)  
In a basement installation, the pipes may be run between the joist  
spaces. If the pipes must go below the joist and then up into the  
last joist space to penetrate the header, two 45° elbows should be  
used to reach the header rather than two 90° elbows.  
20  
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CONDENSATE DRAIN LINES & DRAIN TRAP  
CONDENSATE DRAIN LINES & DRAIN TRAP  
HOSE A  
QTY: 1  
A condensing gas furnace achieves its high level of efficiency by  
extracting almost all of the heat from the products of combustion  
and cooling them to the point where condensation takes place.  
The condensate which is generated must be piped to an appropri-  
ate drain location.  
HOSE B  
QTY: 1  
DRAIN TRAP  
QTY: 1  
TUBE 1  
QTY: 1  
GREEN  
HOSE CLAMPS  
QTY: 3  
TUBE 2  
QTY: 2  
In upright installations, the furnace’s drain hoses may exit either  
the right or left side of the furnace. NOTE:If the alternate vent/flue  
outlet is utilized in an upright installation, the drain trap and drain  
connections must be located on the same side as the alternate  
vent/flue outlet.  
SILVER  
HOSE CLAMP  
QTY: 1  
RED  
HOSE CLAMP  
QTY: 1  
Hose and Tube Identification  
In horizontal installations, the drain hoses will exit through the  
bottom (down side) of the unit with the drain trap suspended be-  
neath the furnace. The field-supplied drain system must be in  
accordance with all local codes and the instructions in the follow-  
ing sections.  
Follow the bullets listed below when installing the drain system.  
Refer to the following sections for specific details concerning fur-  
nace drain trap installation and drain hose hook ups.  
The drain trap supplied with the furnace must be used.  
The drain line between furnace and drain location must  
be constructed of 3/4” PVC.  
The drain line between furnace and drain location must  
maintain a 1/4 inch per foot downward slope toward the  
drain.  
Do not trap the drain line in any other location than at  
the drain trap supplied with the furnace.  
Do not route the drain line outside where it may freeze.  
If the drain line is routed through an area which may  
see temperatures near or below freezing, precautions  
must be taken to prevent condensate from freezing  
within the drain line.  
If an air conditioning coil is installed with the furnace, a  
common drain may be used. An open tee must be  
installed in the drain line, near the cooling coil, to  
relieve positive air pressure from the coil’s plenum.  
This is necessary to prohibit any interference with the  
function of the furnace’s drain trap.  
STANDARDRIGHTORLEFTSIDEDRAINHOSECONNECTIONS  
All installations positions require the use of the drain trap, hoses,  
tubes, and clamps. The following quantity of hoses, tubes, and  
hose clamps are provided with the unit.  
21  
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CONDENSATE DRAIN LINES & DRAIN TRAP  
5. Cut 17 3/4 inches from the long end of Hose B and discard.  
UPRIGHTINSTALLATIONS-TRAPONRIGHTSIDE  
Secure the remaining hose to Tube 1 with a green hose  
clamp. Route the other end of Hose B to front right side  
panel grommet hole.  
In a upright installation drain hoses are connected to drain ports on  
therubberelbowandtherecuperatorcoilfrontcover.Thedrainlines  
are then routed through the right side panel and into the drain trap  
secured to the outside of the cabinet.  
For details concerning mounting of the drain trap, refer toHorizontal  
Drain Trap Mounting.  
6. Insertshortendofeachoftube2throughsidepanelgrommet  
holes. Secure tubes to hoses A and B with green hose  
clamps. Ensurehosesandtubesmaintainadownwardslope  
for proper drainage and that they are not kinked or binding.  
NOTE: Refer to Alternate Vent/Flue Hose Connections for upright  
installations using an alternate vent/flue outlet.  
1. Remove the rubber plug from the right side of the front cover  
drain port.  
2. SecureHoseAtofrontcoverdrainportwitharedhoseclamp.  
Route hose to rear side panel grommet hole.  
3. Cutandremove1/4inchfromtheendofthedrainportonthe  
rubberelbow.  
4. Insert Tube 1 into rubber elbow drain port and secure with  
silverhoseclamp. Angletubeoutwardtowardfrontoffurnace.  
RIGHT SIDE  
PANEL  
RUBBER  
ELBOW  
RUBBER ELBOW  
DRAIN PORT  
SILVER HOSE CLAMP  
TUBE 1  
HOSE  
SIDE PANEL  
B
GROMMET  
HOLES  
TUBE(S) 2  
DRAIN  
TRAP  
RED HOSE  
CLAMP  
HOSE  
A
FRONT  
COVER  
DRAIN PORT  
GREEN  
HOSE  
CLAMPS  
(3 PLACES)  
UprightStandardConnections-RightSide  
(UpflowShown,CounterflowSimilar)  
22  
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CONDENSATE DRAIN LINES & DRAIN TRAP  
ALTERNATEVENT/FLUEDRAINHOSECONNECTIONS  
Upright installations using the alternate vent/flue outlet will require  
“right-side only” drain hoses to be connected as follows. Refer to  
Vent/Flue Pipe and Combustion Air Pipe for details on alternate  
vent/flue pipe connection.  
1. Remove the rubber plug/cap from the right-side drain port  
on the front cover . Save for use in step 3.  
7. Secure straight end of Hose B to exposed end of Tube 1  
with a green hose clamp. Route hose toward right side  
panel grommet holes.  
8. Insert short end of one Tube 2 through rear right side panel  
grommet drain hole. Secure tube to HoseA with a green  
hose clamp.  
2. Secure Hose A to front cover drain port with a red hose  
clamp. Route hose to rear right side panel grommet hole.  
3. Removegrommetfromfrontright-sidepaneldrainhole. Seal  
hole in grommet with large end of plug. Reinstall grommet  
and plug into side panel drain hole.  
9. InsertshortendofremainingTube2intoHoseBfromrubber  
elbow and secure with green hose clamp. Ensure hoses  
and tubes maintain a downward slope for proper drainage  
and are not kinked or binding.  
4. Cut 1/4 inch from the end of the drain port on the externally  
mounted rubber elbow. Discard cut portion.  
5. InsertTube1intorubberelbowdrainportandsecurewitha  
silver hose clamp. Angle tube toward trap.  
6. Cut 17 3/4 inches from the long end of Hose B and discard.  
RUBBER ELBOW  
(EXTERNALLY  
MOUNTED)  
RUBBER  
ELBOW  
FRONT  
COVER  
DRAIN  
PORT  
DRAIN PORT  
HOSE B  
SILVER HOSE CLAMP  
TUBE 1  
GREEN HOSE  
CLAMPS  
(3 PLACES)  
HOSE A  
TUBE(S) 2  
RED HOSE  
CLAMP  
DRAIN TRAP  
UprightAlternateConnections-RightSideOnly  
(UpflowShown, CounterflowSimilar)  
23  
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CONDENSATE DRAIN LINES & DRAIN TRAP  
5. Cut “X” inches from the long end of Hose B and discard.  
UPRIGHTINSTALLATIONS-TRAPONLEFTSIDE  
Refer to table for appropriate length to cut. Secure  
remaining hose to Tube 1 with a green hose clamp. Route  
other end of Hose B to front left side panel grommet hole.  
NOTE: For left side trap installation, grommets must be moved  
to the left side of the furnace and the plugs installed on the right  
side of the furnace.  
1. Remove the rubber plug/cap from the left side drain port  
on the front cover.  
NOTE: Long hose “B” must always be connected to Tube 1 and  
the elbow and not on the front cover.  
6. InsertshortendofeachTube2throughsidepanelgrommet  
holes. Secure tubes to Hose A and Hose B with green  
hose clamps. Ensure hoses and tubes maintain a  
downward slope for proper drainage and that they are not  
kinked or binding.  
2. Secure Hose A to front cover drain port with a red hose  
clamp. Route hose to rear side panel grommet hole.  
3. Cut and remove 1/4 inch from the end of the drain port on  
the rubber elbow.  
4. Insert Tube 1 into rubber elbow drain port and secure with  
silver hose clamp. Angle tube outward toward front of  
furnace.  
LEFT  
SIDE PANEL  
FRONT COVER  
DRAIN PORT  
RUBBER  
ELBOW  
RED HOSE  
CLAMP  
RUBBER  
ELBOW  
DRAIN PORT  
HOSE A  
SILVER HOSE  
CLAMP  
SIDE PANEL  
DRAIN  
HOLES  
TUBE 1  
TUBE(S) 2  
GREEN HOSE  
CLAMP  
DRAIN  
TRAP  
HOSE B  
GREEN  
HOSE CLAMP  
Upright “Standard” Connections - Left Side  
(UpflowShown,CounterflowSimilar)  
"X" Length to Cut From Long  
Cabinet Width  
(inches)  
Models  
(kBTU_Tons)  
End of Hose B  
(inches)  
17 1/2  
21  
45_30  
70_40  
7
3 1/2  
090_50  
115_50  
24 1/2  
None  
24  
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CONDENSATE DRAIN LINES & DRAIN TRAP  
to appropriate length to minimize sagging. Plug left  
(unused) pressure tap with plug removed from right side.  
2. Secure Hose A to front cover drain tap with a red hose  
clamp. Route hose to rear right (down) side panel grommet  
holes.  
UPRIGHT DRAIN TRAP MOUNTING (LEFT OR RIGHT SIDE PANEL)  
1. Insert drain tubes into drain trap and position the drain  
trap against the side panel. NOTE: Drain tubes must  
reach the bottom of the drain trap.  
2. Secure drain trap to side panel at the mounting holes  
(dimples or crosshairs on counterflow models) located  
below the grommet drain holes.  
3. Cut 1/4 inch from the end of the drain port on the rubber  
elbow and discard.  
4. Insert Tube 1 into rubber elbow drain port and secure with  
a silver hose clamp. Angle tube outward toward front of  
furnace.  
5. Cut 17 3/4 inches from the long end of Hose B and discard.  
6. Secure remaining end of Hose B to exposed end of Tube  
1 with a green hose clamp. Route hose to front right  
3. Attach PVC drain line to drain trap outlet with either a 90°  
elbow or coupling.  
HORIZONTALINSTALLATIONS  
RIGHT SIDE DOWN  
down side panel grommet holes.  
7. Cut 5 1/2 inches straight length from the long end of each  
Tube 2 and discard the radius pieces.  
Horizontal installations with the right side down require that the  
drain hoses be connected to the right side front cover drain port  
and the rubber elbow drain port.  
8. Insert approximately one inch of each Tube 2 through the  
right down side panel grommet holes. Secure tubes to  
Hose A and Hose B using green hose clamps. Ensure  
hoses and tubes maintain a downward slope for proper  
drainage and are not kinked or bound.  
NOTE: On counterflow models, relocation of the front cover  
pressure switch hose is required.  
Make connections as follows:  
1. Remove the rubber plug/cap from right side of the front  
cover drain port.  
For details concerning mounting of the drain trap, refer to Con-  
densateDrainLinesandDrainTrap-Horizontal DrainTrapMount-  
ing.  
Counterflow furnaces  
Relocate the front cover pressure switch hose connection  
from the left side pressure tap to the right (down) side tap.  
The pressure switch hose must be connected to the down  
side to guard against blocked drain conditions. Cut hose  
FRONT COVER  
DRAIN PORT  
RED HOSE  
CLAMP  
HOSE A  
FRONT  
COVER  
HOSE B  
PRESSURE  
RUBBER  
ELBOW  
TAP  
RIGHT  
SIDE  
PANEL  
TUBES 2  
RUBBER ELBOW  
DRAIN PORT  
GREEN  
HOSE  
CLAMP  
TUBE 1  
SILVER HOSE  
CLAMP  
DRAIN TRAP  
(3 PLACES)  
HorizontalConnections-RightSideDown  
(UpflowShown, CounterflowSimilar)  
25  
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CONDENSATE DRAIN LINES & DRAIN TRAP  
6. Cut 5 1/2 inches straight length from the long end of each  
LEFT SIDE DOWN  
Tube 2 and discard radius ends.  
Horizontal installations with the left side panel down will require  
drain hoses to be connected to the left side front cover drain port  
and the side drain port on the rubber elbow.  
7. Insert approximately one inch of each Tube 2 through left  
side panel grommet hole. Secure tubes to Hose A and  
Hose B with a green hose clamps. NOTE: Tube must  
reach bottom of trap. Ensure hoses and tubes maintain a  
downward slope for proper drainage and that they are not  
kinked or binding.  
1. Removetherubberplug/capfromthefrontcoverleft(down)  
side drain port.  
2. Relocate the front cover pressure switch hose connection  
from the right side (as shipped) pressure tap to the left  
(down) side tap. The pressure switch hose must be  
connected to the down side to guard against blocked drain  
conditions. Cut hose to appropriate length to minimize  
sagging. Plug right (unused) pressure tap with plug  
removed from left side.  
For details concerning mounting of the drain trap, refer to Con-  
densateDrainLinesandDrainTrap-HorizontalDrainTrapMount-  
ing.  
HORIZONTAL DRAIN TRAP MOUNTING (LEFT OR RIGHT SIDE  
PANEL)  
1. Position the drain trap against side panel with drain tubes  
inserted into trap. Note that the trap may be orientated  
with the outlet facing either the furnace’s top cover or base  
pan.  
3. Secure Hose A to front cover drain port with a red hose  
clamp. Route hose to rear left (down) side panel grommet  
holes. NOTE: For left side drainage, grommets must be  
relocated to left side panel.  
2. Secure drain trap to side panel at the dimples or crosshairs  
located on either side of the grommet drain holes.  
3. Confirm that tubes reach bottom of drain trap and that all  
hoses maintain a downward slope and are not kinked or  
binding.  
4. Remove the rubber cap from the side drain port on the  
rubber elbow.  
5. Secure the short end of Hose B to rubber elbow side drain  
port using a green hose clamp. NOTE: For left side  
drainage, route hose to far left (down) side panel grommet  
holes. NOTE: Horizontal left side connections (when using  
new side port drain elbow) does not require connecting a  
hose to the induced draft blower housing.  
4. Attach PVC drain line to drain trap outlet with either a 90°  
elbow or coupling.  
GREEN HOSE  
CLAMP  
HOSE B  
HOSE A  
FRONT  
COVER  
PRESSURE  
TAP  
GREEN HOSE  
CLAMP  
TUBE(S) 2  
LEFT SIDE  
PANEL  
FRONT COVER  
DRAIN PORT  
DRAIN TRAP  
RED HOSE CLAMP  
SIDE PANEL  
GROMMET  
HOLES  
Horizontal Connections - Left Side Down  
(UpflowShown, CounterflowSimilar)  
26  
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ELECTRICAL CONNECTIONS  
left side panel. The furnace is shipped configured for a right 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 junc-  
tion box must be relocated to the other side of the burner com-  
partment prior to making electrical connections. To relocate the  
junction box, follow the steps shown below.  
ELECTRICAL CONNECTIONS  
WARNING  
HIGH VOLTAGE !  
TO AVOID THE RISK OF ELECTRICAL SHOCK, WIRING TO  
THE UNIT MUST BE POLARIZED AND GROUNDED.  
NOTE: Wire routing must not to interfere with circulator blower  
operation, filter removal, or routine maintenance.  
WARNING  
JUNCTIONBOXRELOCATION  
HIGH VOLTAGE !  
TO AVOID PERSONAL INJURY OR DEATH DUE TO  
ELECTRICAL SHOCK, DISCONNECT ELECTRICAL POWER  
BEFORE SERVICING OR CHANGING ANY ELECTRICAL  
WIRING.  
WARNING  
EDGES OF SHEET METAL HOLES MAY BE SHARP. USE GLOVES AS A  
PRECAUTION WHEN REMOVING HOLE PLUGS.  
CAUTION  
WARNING  
LABEL ALL WIRES PRIOR TO DISCONNECTION WHEN SERVICING  
CONTROLS. WIRING ERRORS CAN CAUSE IMPROPER AND DANGEROUS  
OPERATION. VERIFY PROPER OPERATION AFTER SERVICING.  
TO PREVENT PERSONAL INJURY OR DEATH DUE TO ELECTRIC SHOCK,  
DISCONNECT ELECTRICAL POWER BEFORE INSTALLING OR SERVICING THIS  
UNIT.  
WIRINGHARNESS  
WARNING  
The wiring harness is an integral part of this furnace. Field alter-  
ation to comply with electrical codes should not be required.  
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.  
HIGH VOLTAGE !  
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 CODE.  
Line voltage connections can be made through either the right or  
left side panel. The furnace is shipped configured for a right side  
electrical connection. To make electrical connections through  
the opposite side of the furnace, the junction box must be relo-  
cated to the left side prior to making electrical connections. To  
relocate the junction box, perform the following steps.  
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.  
115VOLTLINECONNECTIONS  
Before proceeding with electrical connections, ensure that the  
supply voltage, frequency, and phase correspond to that speci-  
fied 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 ofThe National  
Electric Code,ANSI NFPA70 and/orThe Canadian Electric Code  
CSA C22.1.  
Use a separate fused branch electrical circuit containing prop-  
erly 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 elec-  
trical disconnect must be provided at the furnace location.  
WARNING  
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 ELECTRICAL CODE.  
Connect hot, neutral, and ground wires as shown in the wiring  
diagram located on the unit’s blower door. For direct vent appli-  
cations, 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.  
To ensure proper unit grounding, the ground wire should run from  
the furnace ground screw located inside the furnace junction box  
all the way back to the electrical panel. NOTE: Do not use gas  
piping as an electrical ground. To confirm proper unit grounding,  
turn off the electrical power and perform the following check.  
Line polarity must be observed when making field connections.  
Line voltage connections can be made through either the right or  
27  
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ELECTRICAL CONNECTIONS  
1. Measureresistancebetweentheneutral(white)connection  
and one of the burners.  
2. Resistance should measure 10 ohms or less.  
Thermostat  
Single Stage Heating with  
Single Stage Cooling  
R
R
Furnace Integrated  
Control Module  
This furnace is equipped with a blower door interlock switch which  
interruptsunitvoltagewhentheblowerdoorisopenedforservicing.  
Do not defeat this switch.  
NEU  
Y
C
Dehumidistat  
[Optional]  
24VOLTTHERMOSTATWIRING  
IMPORTANT NOTE  
Remote  
Condensing Unit  
(Single-Stage Cooling)  
Single Stage Heating with Single Stage Cooling  
WIRE ROUTING MUST NOT INTERFERE WITH CIRCULATOR BLOWER  
OPERATION, FILTER REMOVAL OR ROUTINE MAINTENANCE.  
NOTE: To apply a single-stage Heating Thermostat,  
the thermostat selector switch on the  
Integrated Control Module must be set on  
single-stage.  
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 MULTIPLE WIRES INTO A SINGLE  
TERMINAL BE TWISTED TOGETHER PRIOR TO INSERTING INTO THE PLUG  
CONNECTOR. FAILURE TO DO SO MAY RESULT IN INTERMITTENT  
OPERATION.  
Thermostat  
Two-Stage Heating  
with  
R
R
Single-Stage Cooling  
Furnace Integrated  
Control Module  
Asatwo-stagenon-communicatingfurnace, thefurnaceintegrated  
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: ‘Two-Stage Heating  
Only’, ‘Two-Stage Heating with Single Stage Cooling’, and ‘Two-  
Stage Heating withTwo-Stage Cooling’. Refer to the following fig-  
ures for proper connections to the integrated control module.  
NEU  
Y
C
Dehumidistat  
[Optional]  
Remote  
Condensing Unit  
(Single-Stage Cooling)  
Two-Stage Heating with Single-Stage Cooling  
Thermostat  
Two-Stage Heating  
Y2  
W1 W2  
with  
Low voltage connections can be made through either the right or  
left side panel. Thermostat wiring entrance holes are located in the  
blowercompartment. Thefollowingfigureshowsconnectionsfora  
“heat/cool system”.  
( )  
Two-Stage Cooling  
Furnace Integrated  
Control Module  
Y2  
Y2  
W1 W2  
This furnace is equipped with a 40 VAtransformer 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.  
NEU  
Dehumidistat  
[Optional]  
Remote  
Condensing Unit  
(Two-Stage Cooling)  
NOTE: For single stage cooling applications, a jumper must be  
located 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 and Y1 and DEHUM, respectively.  
Two-Stage Heating with Two-Stage Cooling  
Thermostat Wiring Diagrams  
SINGLE-STAGE HEATINGTHERMOSTATAPPLICATION  
NOTE:ThermostatRrequiredifoutdoorunitisequippedwitha  
Comfort Alert™ module or if the out door unit is a part of the  
ComfortNet family of equipment AND is wired as a legacy  
system.  
A single-stage thermostat with only one heating stage may be  
used to control this furnace. The application of a single-stage  
thermostat offers a timed transition from low to high fire. The  
furnace will run on low stage for a fixed period of time before step-  
ping 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 theAUTO 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.  
28  
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ELECTRICAL CONNECTIONS  
temperature sensor to determine the most cost efficient means of  
heating (heat pump or gas furnace).  
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.  
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.  
OFF  
ON  
Move to the ON position  
to select two-stage  
thermostat or OFF to  
select single stage  
thermostat  
Heat OFF Delay  
DIP Switches  
Strictly follow the wiring guidelines in the fossil fuel kit installation  
instructions. All furnace connections must be made to the furnace  
two-stageintegratedcontrolmoduleandtheFURNACEterminal  
strip on the fossil fuel control board.  
3
4
Thermostat  
Stage Delay  
Move to the ON position  
to select Auto transition  
delay or OFF for 5 minute  
transition delay  
S1  
115VOLTLINECONNECTIONOFACCESSORIES (HUMIDIFIERAND  
ELECTRONICAIRCLEANER)  
24VOLTDEHUMIDISTATWIRING  
WARNING  
The optional usage of a dehumidistat allows the furnace’s circula-  
tor blower to operate at a slightly lower speed (85% of desired  
speed) during a combined thermostat call for cooling and dehumi-  
distat call for dehumidification. This can be done through an inde-  
pendent dehumidistat or through a thermostat’s DEHUM terminal  
(if available). This lower blower speed enhances dehumidification  
of the conditioned air as it passes through theAC 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 wir-  
ing details.  
HIGH VOLTAGE !  
TO AVOID PERSONAL INJURY OR DEATH DUE TO  
ELECTRICAL SHOCK, DISCONNECT ELECTRICAL POWER  
BEFORE SERVICING OR CHANGING ANY ELECTRICAL  
WIRING.  
Thefurnaceintegratedcontrolmoduleisequippedwithlinevoltage  
accessory terminals for controlling power to an optional field-sup-  
plied humidifier and/or electronic air cleaner.  
The accessory load specifications are as follows:  
To install/connect a dehumidistat:  
1. Turn OFF power to furnace.  
Humidifier  
Electronic Air Cleaner  
1.0 Amp maximum at 120 VAC  
1.0 Amp maximum at 120 VAC  
2. Secure the dehumidistat neutral wire (typically the white  
lead) to the terminal marked “DEHUM” on the furnace  
integrated control module.  
3. Secure the dehumidistat hot wire (typically the black lead)  
to the terminal marked “R” on the furnace integrated control  
module.  
4. 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.  
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. Thehumidifierandelectronicaircleanerhotterminalsare  
identified as HUM and EAC. The humidifier and electronic air  
cleaner neutral terminals are identified as NEUTRAL.All field wir-  
ing must conform to applicable codes. Connections should be  
made as shown.  
5. Turn ON power to furnace.  
To enable the dehumidify function on the integrated control mod-  
ule, set the dehumidification ENABLE dipswitch from OFF to ON.  
Once the switch is set, the dehumidify function is enabled during a  
combinationcallforcooling(T-Stat)anddehumidification(DEHUM-  
Stat).  
ON  
OFF  
9
DEHUM  
Unused  
Move to the ON position  
to enable dehumidification  
10  
S5  
FOSSILFUELAPPLICATIONS  
This furnace can be used in conjunction with a heat pump in a  
fossil fuel application. Afossil fuel application refers to a combined  
gas furnace and heat pump installation which uses an outdoor  
29  
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GAS SUPPLY AND PIPING  
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 appli-  
ances 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  
Natural Gas  
Propane Gas  
Minimum: 5.0" w.c. Maximum:10.0" w.c.  
Minimum: 11.0" w.c. Maximum:13.0" w.c.  
HIGHALTITUDEDERATE  
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 combus-  
tion 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 alti-  
tude and usage of either natural or propane gas. Contact your  
distributor for a tabular listing of appropriate altitude ranges and  
corresponding manufacturer’s high altitude (Natural, propane gas,  
and/or Pressure Switch) kits.  
Accessories Wiring  
If it is necessary for the installer to supply additional line voltage  
wiring to the inside of the furnace, the wiring must conform to all  
local codes, and have a minimum temperature rating of 105°C. All  
line voltage wire splices must be made inside the furnace junction  
box.  
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  
willprohibittheburnerorificefromdrawingtheproperamountofair  
into the burner. This may cause incomplete combustion, flash-  
back, and possible yellow tipping.  
The integrated control module humidifier terminals (HUM) are en-  
ergized with 115 volts whenever the induced draft blower is ener-  
gized. The integrated control module electronic air cleaner termi-  
nals (EAC) are energized with 115 volts whenever the circulator  
blower is energized.  
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 artifi-  
cially derated, the appropriate orifice size must be determined  
based upon the BTU/ft3 content of the derated gas and the alti-  
tude. RefertotheNationalFuelGasCode, NFPA54/ANSIZ223.1,  
andinformationprovidedbythegassuppliertodeterminetheproper  
orifice size.  
24VOLTHUMIDIFIER  
A 5" long brown wire in the wire harness at the low fire pressure  
switch provides 24 VAC humidifier control. This wire is powered  
any time the pressure switch is closed. To connect 24 VAC HUM,  
connect the 24 VAC line of the humidifier to the 5” brown wire. The  
connection can be made by either stripping the wire and using a  
wire nut or by using a field supplied quick connect terminal. The  
wiring must conform to all local and national codes. Connect the  
COM side of the humidifier to the C terminal on the furnace control  
board (or to the COM side of the 24 VAC transformer). Do not  
connect 115V humidifier to these terminals.  
Adifferentpressureswitchmayberequiredathighaltituderegard-  
less of the BTU/ft3 content of the fuel used. Contact your distribu-  
tor for a tabular listing of appropriate altitude ranges and corre-  
sponding manufacturer’s pressure switch kits.  
PROPANEGASCONVERSION  
GAS SUPPLY AND PIPING  
WARNING  
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.  
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.  
CAUTION  
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.  
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.  
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GAS SUPPLY AND PIPING  
Contact your distributor for a tabular listing of appropriate  
manufacturer’s kits for propane gas and/or high altitude installa-  
tions. The indicated kits must be used to insure safe and proper  
furnace operation. All conversions must be performed by a quali-  
fied installer, or service agency.  
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. Re-  
fer to Gas Piping Connections figure for typical gas line connec-  
tions to the furnace.  
GAS VALVE  
Use black iron or steel pipe and fittings for building piping.  
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,  
thevalveisconfiguredfornaturalgas. Thevalveisfieldconvertible  
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  
FORALLGASSES. DO NOTapply 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 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.  
GASPIPINGCONNECTIONS  
WARNING  
Alwaysuseaback-upwrenchwhenmakingtheconnection  
to the gas valve to keep it from turning. The orientation of  
thegasvalveonthemanifoldmustbemaintainedasshipped  
from the factory. Maximum torque for the gas valve  
connection is 375 in-lbs; excessive over-tightening may  
damagethegasvalve.  
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.  
When sizing a trunk line, be sure to include all appliances which  
will operate simultaneously when sizing a trunk line.  
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.  
Thegaspipingsupplyingthefurnacemustbeproperlysizedbased  
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, NFPA54/ANSI Z223.1.  
Tighten all joints securely.  
Connect the furnace to the building piping by one of the  
followingmethods:  
Natural Gas Capacity of Pipe  
In Cubic Feet of Gas Per Hour (CFH)  
Rigid metallic pipe and fittings.  
Length of  
Nominal Black Pipe Size  
Pipe in Feet  
1/2"  
132  
92  
73  
63  
56  
50  
46  
43  
40  
38  
3/4"  
1"  
1 1/4"  
1 1/2"  
1600  
1100  
980  
Semi-rigid metallic tubing and metallic fittings.  
10  
20  
30  
40  
50  
60  
70  
80  
90  
100  
278  
190  
152  
130  
115  
105  
96  
520  
350  
285  
245  
215  
195  
180  
170  
160  
150  
1050  
730  
590  
500  
440  
400  
370  
350  
320  
305  
Aluminum alloy tubing must not be used in exterior  
locations. In order to seal the grommet cabinet  
penetration,rigidpipemustbeusedtoreachtheoutside  
ofthecabinet. Asemi-rigidconnectortothegaspiping  
may be used from there.  
760  
670  
610  
560  
90  
84  
530  
490  
Use listed gas appliance connectors in accordance with  
their instructions. Connectors must be fully in the same  
room as the furnace.  
79  
460  
(Pressure 0.5 psig or less and pressure drop of 0.3" W.C.; Based on  
0.60 Specific Gravity Gas)  
Protect connectors and semirigid tubing against physical  
and thermal damage when installed. Ensure aluminum-  
alloy tubing and connectors are coated to protect against  
external corrosion when in contact with masonry, plaster,  
or insulation, or subjected to repeated wetting by liquids  
such as water (except rain water), detergents, or sewage.  
BTUH Furnace Input  
CFH =  
Heating Value of Gas (BTU/Cubic Foot)  
To connect the furnace to the building’s gas piping, the installer  
must supply a ground joint union, drip leg, manual shutoff valve,  
and line and fittings to connect to gas valve. In some cases, the  
31  
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GAS SUPPLY AND PIPING  
GAS VALVE  
MANUAL  
SHUT OFF VALVE  
(UPSTREAM FROM  
MANIFOLD  
BURNERS  
GAS LINE  
PLUG IN  
PIPE UNION)  
PLUG IN  
ALTERNATE  
GAS LINE  
HOLE  
GAS LINE  
HOLE  
HEIGHT REQUIRED  
BY LOCAL CODE  
GROMMET  
IN STANDARD  
GAS LINE HOLE  
GAS VALVE  
PIPE UNION  
DRIP LEG  
DRIP LEG  
BURNERS  
MANUAL SHUT-OFF VALVE  
(UPSTREAM FROM GROUND  
JOINT PIPE UNION)  
GROUND JOINT  
PIPE UNION  
DRIP LEG  
GROMMET IN STANDARD  
GAS LINE HOLE  
GAS VALVE  
GAS VALVE  
BURNERS  
BURNERS  
DRAIN TRAP  
DRAIN TRAP  
MANIFOLD  
PLUG IN ALTERNATE  
GAS LINE HOLE  
ALTERNATE GAS  
LINE LOCATION  
PLUG IN ALTERNATE  
GAS LINE HOLE  
MANIFOLD  
ALTERNATE GAS  
LINE LOCATION  
HORIZONTAL[COUNTERFLOW]  
HORIZONTAL [UPFLOW MODEL]  
GasPipingConnections  
32  
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GAS SUPPLY AND PIPING  
DIRECT/STANDARDINLETPIPING  
PROPANEGASTANKSAND PIPING  
WARNING  
WARNING  
IF THE GAS FURNACE IS INSTALLED IN A BASEMENT, AN EXCAVATED  
AREA OR CONFINED SPACE, IT IS STRONGLY RECOMMENDED TO  
CONTACT A PROPANE SUPPLIER TO INSTALL A GAS DETECTING WARNING  
DEVICE IN CASE OF A GAS LEAK.  
EDGES OF SHEET METAL HOLES MAY BE SHARP. USE GLOVES AS A  
PRECAUTION WHEN REMOVING HOLE PLUGS.  
When gas piping enters directly to the gas valve through the stan-  
dard inlet hole, the installer must supply straight pipe with a ground  
joint union to reach the exterior of the furnace. The rigid pipe must  
be long enough to reach the outside of the cabinet to seal the  
grommet cabinet penetration. A semi-rigid connector to the gas  
piping can be used outside the cabinet per local codes.  
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 pro-  
pane gas. Do not rely on your sense of smell. Contact a local  
propane gas supplier about installing a gas detecting warning sys-  
tem. If the presence of gas is suspected, follow the instructions  
listed in the Safety Precautions section of this manual.  
INDIRECT/ALTERNATEINLETPIPING  
When gas piping enters indirectly to the gas valve through the  
alternate gas inlet hole the following fittings (starting from the gas  
valve) to reach the outside of the cabinet must be supplied:  
Coupling.  
All propane gas equipment must conform to the safety standards  
of the National Board of Fire Underwriters, NBFU Manual 58.  
90degreeelbow.  
2 inch close nipple.  
90degreeelbow.  
For satisfactory operation, propane gas pressure must be 11 inch  
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).  
Straight pipe, with a ground joint union, to reach the exterior  
of the furnace. The rigid pipe must be long enough to reach  
theoutsideofthecabinetsoastosealthegrommetcabinet  
penetration. Asemi-rigid connector to the gas piping can  
be used outside the cabinet per local codes.  
3. Pressure drop in lines between regulators, and between  
second stage regulator and the appliance. Pipe size will  
dependonlengthofpiperunandtotalloadofallappliances.  
GAS PIPING CHECKS  
Before placing unit in operation, leak test the unit and gas connec-  
tions.  
Complete information regarding tank sizing for vaporization, rec-  
ommended 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 stan-  
dard commercial compounds, special pipe dope must be used.  
Shellac-based compounds resistant to the actions of liquefied pe-  
troleum gases such as Gasolac®, Stalactic®, Clyde’s® or John  
Crane® are satisfactory.  
Check for leaks using an approved chloride-free soap and water  
solution, anelectroniccombustiblegasdetector, orotherapproved  
testing methods.  
Refer to the following illustration for typical propane gas installa-  
tions 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  
First Stage  
(20 PSIG Max.)  
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).  
Continuous  
11" W.C.  
200 PSIG  
Maximum  
Second Stage  
Regulator  
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).  
PropaneGasInstallation(Typ.)  
33  
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GAS SUPPLY 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.  
ing, Warm Air Heating and Ventilating Systems. Pamphlets No.  
90A and 90B.  
Pipe or  
A closed return duct system must be used, with the return duct  
connected to the furnace. NOTE: Ductwork must never be at-  
tached to the back of the furnace. For upflow installations requir-  
ing 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 transmis-  
sion.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.  
Nominal Pipe Size  
Schedule 40  
Tubing Size, O.D. Type L  
Tubing  
Length  
Feet  
10  
3/8"  
730  
500  
400  
370  
330  
300  
260  
220  
200  
190  
170  
160  
1/2"  
1,700  
1,100  
920  
5/8"  
3,200  
220  
3/4"  
7/8"  
1/2"  
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  
8,300  
5,800  
4,700  
4,100  
3,700  
3,300  
2,900  
2,600  
2,300  
2,100  
1,900  
1,800  
3,200  
2,200  
1,800  
1,600  
1,500  
1,300  
1,200  
1,000  
900  
7,500  
4,200  
4,000  
3,700  
3,400  
3,100  
2,600  
2,300  
2,100  
1,900  
1,700  
1,500  
20  
30  
2,000  
1,700  
1,500  
1,300  
1,200  
1,000  
900  
40  
850  
50  
770  
60  
700  
80  
610  
100  
125  
150  
175  
200  
540  
490  
430  
830  
830  
400  
780  
770  
380  
730  
720  
CHECKING DUCT STATIC  
To convert to capacities at 15 psig settings - multiply by 1.130  
To convert to capacities at 5 psig settings - multiply by 0.879  
Refer to your furnace rating plate for the maximum ESP (ex-  
ternal duct static) rating.  
Propane Gas Piping Chart I  
Total external static refers to everything external to the fur-  
nace 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.  
Sizing Between Second or Second Stage Regulator & Appliance*  
Maximum Propane Capacities listed are based on 1/2" W.C. pressure drop at 11" W.C. setting.  
Capacities in 1,000 BTU/hour.  
Pipe or  
Nominal Pipe Size  
Tubing Size, O.D. Type L  
Tubing  
Length  
Feet  
10  
Schedule 40  
3/8"  
39  
26  
21  
19  
18  
16  
13  
11  
10  
9
1/2"  
92  
62  
50  
41  
37  
35  
29  
26  
24  
21  
19  
17  
5/8"  
199  
131  
107  
90  
3/4"  
329  
216  
181  
145  
131  
7/8"  
501  
346  
277  
233  
198  
1/2"  
275  
189  
152  
129  
114  
103  
89  
3/4"  
1"  
1-1/4" 1-1/2"  
567 1,071 2,205 3,307  
20  
393  
315  
267  
237  
217  
185  
162  
146  
132  
112  
100  
732 1,496 2,299  
590 1,212 1,858  
504 1,039 1,559  
30  
40  
50  
79  
448  
409  
346  
307  
275  
252  
209  
185  
913  
834  
724  
630  
567  
511  
439  
390  
1,417  
1,275  
1,066  
976  
60  
72  
1,211 187  
80  
62  
104  
90  
81  
72  
66  
60  
155  
138  
122  
109  
100  
93  
100  
125  
150  
200  
250  
55  
78  
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.  
48  
69  
866  
43  
63  
787  
8
39  
54  
665  
8
36  
48  
590  
To determine total external duct static pressure, proceed as  
follows;  
*Data in accordance with NFPA pamphlet No. 54  
Propane Gas Piping Chart II  
1. With clean filters in the furnace, use a draft gauge (in-  
clined manometer) to measure the static pressure of the  
return duct at the inlet of the furnace. (Negative Pressure)  
CIRCULATING AIR & FILTERS  
2. Measure the static pressure of the supply duct. (Positive  
Pressure)  
DUCTWORK-AIRFLOW  
3. The difference between the two numbers is .4” w.c.  
Example:  
WARNING  
NEVER ALLOW THE PRODUCTS OF COMBUSTION, INCLUDING CARBON  
MONOXIDE, TO ENTER THE RETURN DUCT WORK OR CIRCULATION AIR  
SUPPLY.  
static reading from return duct = -.1" w.c.  
static reading from supply duct = .3" w.c.  
total external static pressure on this system = .4" w.c.  
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 ofAmerica” Manual D.  
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.  
Install the duct system in accordance with Standards of the Na-  
tionalBoardofFireUnderwritersfortheInstallationofAirCondition-  
34  
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CIRCULATING AIR & FILTERS  
4. Consult proper tables for the quantity of air.  
CUT USING TIN SNIPS  
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.  
PRESS OUT BY HAND  
CUT FOUR CORNERS  
AFTER REMOVING SHEET  
METAL  
SCRIBE LINES OUTLINING  
DUCT FLANGES  
DuctFlangeCutOuts  
When the furnace is used in connection with a cooling unit, the  
furnace should be installed in parallel with or on the upstream side  
of the cooling unit to avoid condensation in the heating element.  
With a parallel flow arrangement, the dampers or other means  
used to control the flow of air must be adequate to prevent chilled  
air from entering the furnace and, if manually operated, must be  
equipped with means to prevent operation of either unit unless the  
damper is in the full heat or cool position.  
When the furnace is installed without a cooling coil, it is recom-  
mended 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.  
Checking Static Pressure  
(80% Furnace Shown, 90% Similar)  
BOTTOMRETURNAIROPENING[UPFLOWMODELS]  
When the furnace is heating, the temperature of the return air  
entering the furnace must be between 55°F and 100°F.  
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 open-  
ing, cut the sheet metal along the scribe lines to free the duct  
flanges. Using the scribe line along the duct flange as a guide,  
unfoldtheductflangesaroundtheperimeteroftheopeningusinga  
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.  
FILTERS-READTHISSECTIONBEFOREINSTALLINGTHERETURN  
AIRDUCTWORK  
Filters must be used with this furnace. Discuss filter maintenance  
with the building owner. Filters do not ship with this furnace, but  
must be provided, 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.  
On upflow units, guide dimples locate the side return cutout loca-  
tions. Use a straight edge to scribe lines connecting the dimples.  
Cut out the opening on these lines. NOTE:An undersized open-  
ing will cause reduced airflow.  
WARNING  
EDGES OF SHEET METAL HOLES MAY BE SHARP. USE GLOVES AS A  
PRECAUTION WHEN REMOVING SHEET METAL FROM RETURN AIR  
OPENINGS.  
RefertoMinimumFilterAreatablestodeterminefilterarearequire-  
ments.  
35  
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STARTUP PROCEDURE & ADJUSTMENT  
The following figure shows possible filter locations.  
UPFLOW  
COOLING AIRFLOW REQUIREMENT (CFM)  
AIR FLOW  
600  
376*  
---  
800  
384  
---  
1000  
480  
627*  
---  
1200  
576  
1400 1600  
2000  
---  
CENTRAL  
RETURN  
GRILLE  
0453__XA  
0704__XA  
0905__XA  
1155__XA  
---  
---  
627*  
836*  
940*  
672  
768  
---  
SIDE RETURN  
EXTERNAL FILTER  
RACK KIT  
---  
---  
836*  
940*  
836*  
940*  
960  
960  
(EITHER SIDE)  
---  
---  
---  
COUNTERFLOW  
COOLING AIRFLOW REQUIREMENT (CFM)  
600  
---  
800  
---  
1000  
320*  
---  
1200  
320*  
427*  
1400 1600  
2000  
---  
0704__XA  
0714__XA  
0905__XA  
336  
384  
---  
---  
427*  
427*  
480  
0915__XA  
*Minimum filter area dictated by heating airflow requirement.  
Permanent Minimum Filter Area (sq. in)  
PossibleUprightUpflow  
[Based on a 600 ft/min filter face velocity]  
FILTER  
ACCESS  
DOOR  
UPFLOW  
COOLING AIRFLOW REQUIREMENT (CFM)  
600  
800  
384  
---  
1000 1200 1400 1600 2000  
0453__XA 376*  
480  
564*  
---  
576  
564*  
752*  
940*  
---  
---  
---  
RETURN  
DUCT  
CENTRAL  
RETURN  
GRILLE  
0704__XA  
0905__XA  
1155__XA  
---  
---  
---  
672  
752*  
768  
768  
FILTER  
SUPPORT  
BRACKET  
(Field Supplied)  
---  
960  
960  
---  
---  
940* 940*  
COUNTERFLOW  
COOLING AIRFLOW REQUIREMENT (CFM)  
600  
---  
800  
---  
1000 1200 1400 1600 2000  
0704__XA  
0714__XA  
0905__XA  
0915__XA  
641*  
---  
641*  
854*  
672  
768  
---  
---  
---  
854* 854*  
960  
AIR FLOW  
*Minimum filter area dictated by heating airflow requirement.  
PossibleUprightCounterflow  
FilterLocations  
Disposable Minimum Filter area (sq. in)  
[Based on 300 ft/min filter face velocity]  
UPRIGHT INSTALLATIONS  
Depending on the installation and/or customer preference, differ-  
ing filter arrangements can be applied. Filters can be installed in  
the central return register or a side panel external filter rack kit  
(upflows). Asanalternativeamediaairfilterorelectronicaircleaner  
can be used as the requested filter.  
HORIZONTALINSTALLATIONS  
Filters must be installed in either the central return register or in  
the return air duct work.  
STARTUP PROCEDURE &ADJUSTMENT  
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.  
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STARTUP PROCEDURE & ADJUSTMENT  
HEATANTICIPATORSETTING  
GASSUPPLYPRESSUREMEASUREMENT  
The heat anticipator in the room thermostat must be correctly  
adjusted to obtain the proper number of cycles per hour and to  
prevent “overshooting” of the setting. Set the heat anticipator set-  
ting to 0.7 amps. Follow the thermostat manufacturer’s instruc-  
tions on how to adjust the heat anticipator setting.  
CAUTION  
TO PREVENT UNRELIABLE OPERATION OR EQUIPMENT DAMAGE, THE  
INLET GAS SUPPLY PRESSURE MUST BE AS SPECIFIED ON THE UNIT  
RATING PLATE WITH ALL OTHER HOUSEHOLD GAS FIRED APPLIANCES  
OPERATING.  
DRAINTRAPPRIMING  
The drain trap must be primed prior to furnace startup. To prime, fill  
the drain trap with water. This ensures proper furnace drainage  
upon startup and prohibits the possibility of flue gases escaping  
through the drain system.  
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 boss 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  
thefollowingprocedure.  
FURNACEOPERATION  
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, anelectroniccombustiblegasdetector, orotherapproved  
method. Verify that all required kits (propane gas, high altitude,  
etc.) have been appropriately installed.  
INLET  
OUTLET  
FURNACESTARTUP  
1. Close the manual gas shutoff valve external to the furnace.  
2. Turn off the electrical power to the furnace.  
3. Set the room thermostat to the lowest possible setting.  
4. Remove the burner compartment door.  
Gas Valve On/Off  
Selector Switch  
White-Rodgers Model 36G54 (Two-Stage)  
NOTE: This furnace is equipped with an ignition device which  
ter  
anome  
Hose  
M
Open to  
automatically lights the burner. Do not try to light the burner by  
Atmosphere  
hand.  
5. Move the furnace gas valve manual control to the OFF  
High Fire Regulator  
Adjust  
position.  
Outlet  
Pressure Boss  
Regulator  
Vent  
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.  
Low Fire  
Regulator  
Adjust  
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.  
Inlet  
Pressure  
Boss  
High Fire Coil  
inal (HI)  
Coaxial Coil  
Manometer  
Term  
Switch  
inal (M)  
Term  
Common  
Terminal(C)  
On/Off  
White-Rodgers Model 36G54 Connected to Manometer  
FURNACESHUTDOWN  
High Fire  
1. Set the thermostat to the lowest setting.  
Regulator  
Regulator  
Adjust  
Vent  
Theintegratedcontrolwillclosethegasvalveandextinguish  
flame. Followinga15seconddelay, theinduceddraftblower  
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 de-  
energizes.  
2. Removetheburnercompartmentdoorandmovethefurnace  
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.  
Gas Valve On/Off  
Selector Switch  
Low Fire  
Regulator  
Adjust  
37  
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STARTUP PROCEDURE & ADJUSTMENT  
Honeywell Model VR9205 (Two-Stage)  
Gas Line  
Gas  
Shutoff  
Valve  
Common  
Terminal(C)  
meter  
Mano  
en to  
Op  
Atmo  
High Fire Coil  
Terminal (HI)  
e
Hos  
sphere  
Low Fire Coil  
Terminal (LO)  
Gas Line  
To Furnace  
i
Open To  
Atmosphere  
Inlet Pressure Tap  
1/8 NPT  
Drip Leg Cap  
With Fitting  
ter  
Manome  
Manometer Hose  
Manometer  
Outlet Pressure Tap  
1/8 NPT  
Measuring Inlet Gas Pressure (Alt. Method)  
GASMANIFOLDPRESSUREMEASUREMENTANDADJUSTMENT  
Honeywell Model VR9205 Connected to Manometer  
1. Turn OFF gas to furnace at the manual gas shutoff valve  
external to the furnace.  
CAUTION  
TO PREVENT UNRELIABLE OPERATION OR EQUIPMENT DAMAGE, THE  
GAS MANIFOLD PRESSURE MUST BE AS SPECIFIED ON THE UNIT RATING  
PLATE. ONLY MINOR ADJUSTMENTS SHOULD BE MADE BY ADJUSTING  
THE GAS VALVE PRESSURE REGULATOR.  
2. Connect a calibrated water manometer (or appropriate gas  
pressure gauge) at either the gas valve inlet pressure boss  
orthegaspipingdripleg. SeeHoneywellVR9205gasvalve  
figureorWhite-Rodgers36G54gasvalvefigureforlocation  
of inlet pressure boss.  
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.  
NOTE: If measuring gas pressure at the drip leg or Honeywell  
VR9205gasvalve, afield-suppliedhosebarbfittingmustbeinstalled  
prior to making the hose connection. If using the inlet pressure  
boss on the White-Rodgers 36G54 gas valve, then use the 36G  
Valve Pressure Check Kit, Goodman Part No. 0151K00000S.  
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.  
2. Turn off all electrical power to the system.  
3. Outlet pressure tap connections:  
a. Honeywell VR9205 valve: Remove the outlet pressure  
boss plug. Install an 1/8" NPT hose barb fitting into the  
outlet pressure tap.  
b. White-Rodgers 36G54 valve: Back outlet pressure test  
screw (inlet/outlet pressure boss) 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 boss (White-  
Rodgersvalve).  
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 theManifold Gas Pressure  
table shown below.  
Inlet Gas Supply Pressure  
Natural Gas  
Propane Gas  
Minimum: 5.0" w.c. Maximum:10.0" w.c.  
Minimum: 11.0" w.c. Maximum:13.0" w.c.  
If supply pressure differs from table, make the necessary adjust-  
ments 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.  
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.  
38  
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STARTUP PROCEDURE & ADJUSTMENT  
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 boss.  
Installation’s gas heating (HTG) value: 1,000 BTU/ft3  
(Obtained from gas supplier)  
Installation’s seconds per cubic foot: 34 sec/ ft3  
Conversion Factor (hours to seconds): 3600 sec/hr  
Input = (Htg. value x 3600) ÷ seconds per cubic foot  
Input = (1,000 BTU/ft3 x 3600 sec/hr) ÷ 34 sec/ ft3  
Input = 106,000 BTU/hr  
Minor changes to the input rate may be accomplished through  
manifold pressure adjustments at the gas valve. Refer to Startup  
ProcedureandAdjustment-GasManifoldPressureMeasurement  
and Adjustment section for details. NOTE: The final manifold  
pressure cannot vary by more than ± 0.3” w.c. from the specified  
setting. Consult your local gas supplier if additional input rate  
adjustment is required.  
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 boss plug and seal with a high quality  
thread sealer.  
b. White-Rodgers 36G54 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  
thevalve.  
5. Repeat steps 2 through 4 on high stage.  
6. Turn ON gas to and relight all other appliances turned off in  
step1. Becertainthatallappliancesarefunctioningproperly  
and that all pilot burners are operating.  
TEMPERATURERISE  
Using a leak detection solution or soap suds, check for leaks at  
outletpressurebossplug(Honeywellvalve)orscrew(White-Rodg-  
ersvalve). Bubblesformingindicatealeak. SHUTOFFGASAND  
REPAIRALLLEAKS IMMEDIATELY!  
NOTE: For gas to gas conversion, consult your dealer for  
appropriateconversion.  
Temperature rise must be within the range specified on the unit  
rating plate.An incorrect temperature rise may result in condens-  
ing in or overheating of the heat exchanger. An airflow and tem-  
perature 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. Ensureallregistersareopenandallductdampers  
are in their final (fully or partially open) position.  
Manifold Gas Pressure  
2. Placethermometersinthereturnandsupplyductsasclose  
to the furnace as possible. Thermometers must not be  
influenced by radiant heat by being able to “see” the heat  
exchanger.  
Gas  
Range  
Nominal  
1.9" w .c.  
3.5" w .c.  
6.0" w .c.  
Natural  
Low Stage 1.6 - 2.2" w .c.  
High Stage 3.2 - 3.8" w .c.  
Low Stage 5.7 - 6.3" w .c.  
Propane  
High Stage 9.7 - 10.3" w .c. 10.0" w .c.  
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.  
Decreaseblowerspeedtoincreasetemperaturerise. Refer  
to Startup Procedure and Adjustment -Circulator Blower  
Speeds for speed changing details.  
GASINPUTRATEMEASUREMENT(NATURALGASONLY)  
The gas input rate to the furnace must never be greater than that  
specified on the unit rating plate. To measure natural gas input  
using the gas meter, use the following procedure.  
1. TurnOFFthegassupplytoallothergas-burningappliances  
except the furnace.  
2. While the furnace is operating, time and record one  
complete revolution of the smallest gas meter dial.  
3. Calculate the number of seconds per cubic foot (sec/ft3) of  
gas being delivered to the furnace. If the dial is a one cubic  
foot dial, divide the number of seconds recorded in step 2  
by one. If the dial is a two cubic foot dial, divide the number  
of seconds recorded in step 2 by two.  
4. CalculatethefurnaceinputinBTUsperhour(BTU/hr). Input  
equals the sum of the installation’s gas heating value and a  
conversionfactor(hourstoseconds)dividedbythenumber  
of seconds per cubic foot. The measured input must not  
be greater than the input indicated on the unit rating plate.  
EXAMPLE:  
39  
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STARTUP PROCEDURE & ADJUSTMENT  
HEAT EXCHANGER  
RADIATION "LINE OF SIGHT"  
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  
andfindtherequiredcoolingspeedandadjustmentsetting.  
SUPPLY  
AIR  
TSUPPLY  
RISE  
=
Example: A *MVC95704CX furnace installed with a 2.5  
ton air conditioning system. The air flow  
TSUPPLY TRETURN  
-
needed is 1000 CFM. Looking at the cooling  
speed chart for *MVC95704CX, find the air  
TRETURN  
flow closest to 1000 CFM. A cooling airflow  
of 990 CFM can be attained by setting the  
cooling speed to “C” and the adjustment to “-  
RETURN  
AIR  
” (minus).  
4. Continuous fan speed is 30% of the furnace’s maximum  
airflow capability.  
Temperature Rise Measurement  
CIRCULATORBLOWERSPEEDS  
Example: If the furnace’s maximum airflow capability is  
2000 CFM, the continuous fan speed will be  
WARNING  
0.30 x 2000 CFM = 600 CFM.  
5. Locate the blower speed selection DIP 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. Refer to the following figure for switch  
positionsandtheircorrespondingtaps. VerifyCFMbynoting  
the number displayed on the dual 7-segment LED display.  
6. Themulti-speedcirculatorbloweralsooffersseveralcustom  
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 5  
and 6. Refer to the following figure for switch positions and  
their corresponding taps. Refer to the bullet points below  
for a description of each ramping profile. Verify CFM by  
noting the number displayed on the dual 7-segment LED  
display.  
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 Specifica-  
tionSheetapplicabletoyourmodelprovidesanairflowtable, show-  
ingtherelationshipbetweenairflow(CFM)andexternalstaticpres-  
sure(E.S.P.), fortheproperselectionofheatingandcoolingspeeds.  
The heating blower speed is shipped set at “B”, and the cooling  
blower speed is set at “D”. These blower speeds should be ad-  
justed by the installer to match the installation requirements so as  
to provide the correct heating temperature rise and correct cooling  
CFM.  
Use the dual 7-segment LED display adjacent to the dipswitches  
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.  
Sw itch Bank: S4  
DIP Sw itch No.  
Ramping  
Profiles  
5
6
A*  
B
OFF  
ON  
OFF  
OFF  
ON  
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.  
C
OFF  
ON  
D
ON  
(*Indicates factory setting)  
Profile A provides only an OFF delay of one (1) minute at  
Example: Cooling Capacity of 30,000 BTU/hr.  
30,000/12,000 = 2.5Tons  
100% of the cooling demand airflow.  
2. Determine the proper air flow for the cooling system. Most  
coolingsystemsaredesignedtoworkwithairflowsbetween  
350and450CFMperton. Mostmanufacturersrecommend  
an air flow of about 400 CFM per ton.  
100% CFM  
100% CFM  
1 min  
OFF  
OFF  
Example: 2.5 tons X 400 CFM per ton = 1000 CFM  
40  
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STARTUP PROCEDURE & ADJUSTMENT  
Low  
Stage  
Cool  
High  
Stage  
Cool  
Low  
Stage  
Heat  
High  
Stage  
Heat  
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. Aone (1)  
minuteOFFdelayat100%ofthecoolingairflowisprovided.  
Model  
Tap  
A
B
C
D
A
B
C
D
A
B
C
D
A
B
C
D
A
B
C
D
A
B
C
D
A
B
C
D
A
B
C
D
A
B
C
D
A
B
C
D
390  
520  
650  
780  
390  
520  
715  
929  
550  
770  
1000  
1250  
520  
715  
910  
1170  
520  
715  
910  
1170  
390  
520  
715  
929  
360  
520  
780  
960  
520  
715  
910  
1170  
560  
740  
920  
1190  
508  
690  
906  
1165  
600  
800  
550  
792  
600  
864  
*MVC950453BX*  
1000  
1200  
600  
650  
936  
700  
1008  
1210  
1325  
1440  
1555  
1490  
1570  
1690  
1780  
1620  
1721  
1822  
1922  
1771  
1822  
1872  
1922  
1195  
1318  
1440  
1562  
1230  
1350  
1470  
1600  
1598  
1706  
1814  
1922  
1620  
1760  
1860  
1970  
1759  
1791  
1838  
1878  
100% CFM  
100% CFM  
1 min  
50% CFM  
1/2 min  
840  
OFF  
OFF  
800  
920  
*MVC950704CX*  
*MVC950905CX*  
*MVC950905DX*  
*MVC951155DX*  
*CVC90704CX*  
*CVC950714CX*  
*CVC90905DX*  
*CVC950915DX*  
1100  
1429  
810  
1000  
1080  
1050  
1120  
1200  
1250  
1125  
1195  
1265  
1335  
1230  
1265  
1300  
1335  
830  
ProfileCrampsupto85%ofthefullcoolingdemandairflow  
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.  
1100  
1470  
1810  
800  
1000  
1400  
1800  
800  
100% CFM  
OFF  
OFF  
1100  
1400  
1800  
600  
Sw itch Bank: S3  
DIP Sw itch No.  
Cooling Speed  
Taps  
1
2
800  
915  
A
B
OFF  
ON  
OFF  
OFF  
ON  
1100  
1429  
660  
1000  
1085  
870  
C
OFF  
ON  
D*  
ON  
830  
950  
(*Indicates factory setting)  
1130  
1460  
800  
1040  
1130  
1110  
1185  
1260  
1335  
1120  
1220  
1280  
1340  
1214  
1229  
1296  
1302  
Switch Bank: S3  
DIP Switch No.  
Adjust Taps  
1100  
1400  
1800  
810  
3
4
Normal*  
10%  
OFF  
ON  
OFF  
ON  
OFF  
OFF  
ON  
ON  
-10%  
1110  
1430  
1860  
783  
Normal  
(*Indicates factory setting)  
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.  
1091  
1406  
1809  
*CVC91155DX*  
AirflowTable  
OFF  
OFF  
41  
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COMFORTNET™ SYSTEM  
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)  
determineswhichsetofspeedsareavailable. Theselected  
speedmustprovideatemperaturerisewithintheriserange  
listed with the particular model.  
COMFORTNET™ SYSTEM  
OVERVIEW  
The ComfortNet system (or CT™ system) is a system that in-  
cludes a ComfortNet compatible furnace and air conditioner or  
heat pump with a CTK01AAthermostat. Avalid ComfortNet sys-  
tem could also be a compatible furnace, CTK01AA thermostat  
and non-compatible, single stage air conditioner. Any other sys-  
temconfigurationsareconsideredinvalidComfortNetsystemsand  
must be connected as a traditional (or legacy) system (see Elec-  
trical Connections for wiring connections). The table below com-  
pares the valid CT systems.  
Example: The *MVC950704CX is set for 990 CFM on  
cooling, theADJUSTissetto+(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  
the30-60°Friserangeforthe*MVC950704CX.  
This setting will keep electrical consumption  
to a minimum. Set the “Heat” speed DIP  
switches to “A”.  
CT compatible  
Furnace  
CT compatible  
Air Conditioner  
Full CT system  
benefits and features  
Sw itch Bank: S4  
CT compatible  
Furnace  
CT compatible  
Heat Pump  
Full CT system  
benefits and features  
DIP Sw itch No.  
Heating Speed  
Taps  
7
8
Non-CT compatible  
Single Stage  
Air Conditioner  
CT system  
benefits and features  
for furnace only  
A
B*  
C
OFF  
ON  
OFF  
ON  
OFF  
OFF  
ON  
ON  
CT compatible  
Furnace  
D
(*Indicates factory setting)  
AComfortNetheating/airconditioningsystemdiffersfromalegacy/  
traditional system in the manner in which the indoor unit, outdoor  
unit and thermostat interact with one another. In a traditional sys-  
tem, 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.  
8. Select the desired “heating” speed tap by positioning  
switches7and8appropriately. Refertofigureabove. Verify  
CFMbynotingthenumberdisplayedonthedual7-segment  
LED display.  
In general lower heating speeds will: reduce electrical consump-  
tion, lower operating sound levels of the blower, and increase the  
outlet air temperature delivered to the home. The speeds avail-  
able allow the blower performance to be optimized for the particu-  
lar homeowner’s needs.  
On the other hand, the indoor unit, outdoor unit, and thermostat  
comprising a ComfortNet system “communicate” digitally with one  
another. It is now a two-way communications path. The thermo-  
stat still sends commands to the indoor and outdoor units. How-  
ever, thethermostatmayalsorequestandreceiveinformationfrom  
both the indoor and outdoor units. This information may be dis-  
played on the CT 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  
communicationsbetweenthethermostatandsubsystems(indoor/  
outdoor unit) and between subsystems is the key to unlocking the  
benefits and features of the ComfortNet system.  
BLOWERHEAT OFFDELAYTIMINGS  
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.  
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.  
Switch Bank: S1  
DIP Switch No.  
Heat OFF Delay  
1
2
90 seconds  
120 seconds  
150 seconds*  
180 seconds  
OFF  
ON  
OFF  
ON  
OFF  
OFF  
ON  
ON  
AIRFLOW CONSIDERATIONS  
Airflow demands are managed differently in a fully commu-  
nicating system than they are in a legacy wired system.  
The system operating mode (as determined by the thermo-  
stat) 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  
(*Indicates factory setting)  
Heat Off Delay Dipswitches  
42  
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COMFORTNET™ SYSTEM  
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.  
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 CTK01AA thermostat, the furnace/heat pump  
system is automically configured as a fossil fuel system. The  
balance point temperature may be adjusted via the CTK01AA  
thermostat advanced user menus (see CTK01AA instructions  
for additional information).  
System Operating  
System  
Airflow Demand Source  
Air Conditioner  
Furnace  
Mode  
Cooling  
CTK01AAWIRING  
Air Conditioner +  
Furnace  
Heating  
NOTE: RefertoElectricalConnectionsfor115voltlineconnections  
to the furnace.  
Continuous Fan  
Thermostat  
NOTE: Aremovableplugconnectorisprovidedwiththecontrolto  
make thermostat wire connections. This plug may be removed,  
wire connections made to the plug, and replaced. It is strongly  
recommended that multiple wires into a single terminal be twisted  
together prior to inserting into the plug connector. Failure to do so  
may result in intermittent operation.  
Cooling  
Heat Pump  
Heat Pump  
Furnace  
Heat Pump Heating  
Only  
Heat Pump +  
Furnace  
Typical 18AWG 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.  
Auxiliary Heating  
Continuous Fan  
Thermostat  
Cooling  
Heating  
Furnace  
Furnace  
FOUR-WIREINDOOR AND OUTDOORWIRING  
Furnace + Non-  
Comm 1stg Air  
Conditioner  
Typical ComfortNet™ wiring will consist of four wires between the  
indoor unit and outdoor unit and between the indoor unit and ther-  
mostat. The required wires are: (a) data lines, 1 and 2; (b) thermo-  
stat “R” (24 VAC hot) and “C” (24 VAC common).  
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.  
CTK01AA  
Thermostat  
1
1
2
2
R
R
C
C
CT™ Compatible Furnace  
Integrated Control Module  
CT™ Compatible AC/HP  
Integrated Control Module  
1
2
R
C
System Wiring using Four-Wires  
TWO-WIREOUTDOOR,FOUR-WIRE INDOOR WIRING  
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. The trans-  
former is included with the CTK01AA kit. See kit instructions for  
mountingandwiringinstructions. Fourwiresarerequiredbetween  
the indoor unit and thermostat.  
In continuous fan mode, the CTK01AA 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.  
NOTE: Use of the CTK01AA 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  
furnacetransformer.  
FOSSILFUELAPPLICATIONS  
This furnace can be used in conjunction with a CT™ compatible  
heat pump in a fossil fuel application. A fossil fuel application  
43  
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COMFORTNET™ SYSTEM  
Touch and hold the Installer Config key again for  
approximately 3 seconds to enter theAdvanced Installer  
Configurationmenu.  
CTK01AA  
Thermostat  
1
1
2
2
R
R
C
C
CT™ Compatible  
Furnace Integrated  
Control Module  
40VA Transformer (included in  
CTK01AA kit)  
CT™ Compatible  
AC/HP Integrated  
Control Module  
R
C
1
2
24 VAC  
208/230 VAC  
Set Time  
Run  
Set  
Installer  
Config  
Clean Display  
Schedule  
System Wiring using Two-Wires between Furnace and AC/HP and  
Four-Wires between Furnace and Thermostat  
Schedule  
CT COMPATIBLE FURNACE WITH NON-CT COMPATIBLE SINGLE-  
STAGEAIRCONDITIONER  
Upon entering the advanced menus, theAdvanced Fault Menu is  
displayed. The display will change to the Fault Screen and indi-  
cate any faults that may be present in the indoor or outdoor  
equipment. If a fault is present, the Fault Screen will show the  
equipment and an error code with a description of the fault. Touch  
Four wires are required between the furnace and thermostat. Two  
wiresarerequiredbetweenthefurnacecontrolandsinglestageair  
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 CTK01AA kit. Remove  
the red keying tabs from the on-board connector block and posi-  
tion both 4-position connector such that “1”, “2”, “R”, “C”, and “Y1”  
positions are filled.  
_
+
or  
keys to view the fault status of any remaining equip-  
ment. The text “NO FAULTS” will be scrolled if no errors are  
present.  
Call for Service  
Call for Service  
CTK01AA  
Thermostat  
4-Position Connectors  
from CTK01AA  
Advanced  
Advanced  
Thermostat Kit  
Menu  
Menu  
1
2
R
C
Run  
Run  
Schedule  
Schedule  
CT™ Compatible  
Furnace Integrated  
Control Module  
W1 W2 Y1 Y2  
Touch the  
or  
to step through the list of installed equip-  
O
1
2 R C G  
ment, including the thermostat. Touch the Installer Config key  
to enter the submenus for the equipment displayed. The text  
“WORKING” will be displayed in the scrolling display area while  
the data is being retrieved. The first sub-menu is then displayed.  
See tables below for listing of furnace submenus.  
Non-CT™ Compatible  
Single Stage AC  
C
Y
SystemWiringbetweenFurnaceandNon-CTCompatibleSingle  
StageAirConditioner  
Touch the  
or to step through the list of submenus and view  
_
+
settings. If a setting can be adjusted,  
and  
keys will ap-  
COMFORTNETSYSTEMADVANCEDFEATURES  
_
+
pear. Use the  
or  
keys to adjust the setting to the desired  
The ComfortNet system permits access to additional system in-  
formation, advanced setup features, and advanced diagnostic/  
troubleshootingfeatures. Theseadvancedfeaturesareorganized  
into a menu structure. The menus are accessed and navigated as  
described in the following section.  
value. Touch the  
or to step to the next item. “WORK-  
ING” will appear as the settings are being updated. “DONE” will  
appear to indicate the change was accepted. If the change is not  
accepted, the display will show “FAIL” then revert to the Fault  
Screen.  
ACCESSINGAND NAVIGATINGTHEADVANCEDFEATURESMENUS  
Some parameters being displayed switch between the item name  
and the item value. Touch the Hold key to momentarily stop the  
display from switching.  
TheadvancedsystemfeaturesareaccessedusingtheComfortNet  
thermostat. These advanced features are accessed as follows:  
On the CT thermostat Home Screen Display, touch the  
Menu key to display additional key choices.  
TouchandholdtheInstallerConfigkeyforapproximately  
3secondstoentertheThermostatOptionsConfiguration  
menu.  
To exit an equipment submenu and revert back to the equipment  
menus, touch the Menu key. Touch Menu again to revert back  
to theThermostat Options Menu. Touch the Run Schedule key  
to step out of all menus and back to the CT thermostat Home  
Screen Display.  
44  
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COMFORTNET™ SYSTEM  
FURNACE ADVANCED FEATURES MENUS  
CONFIGURATION  
Submenu Item  
Indication (for Display Only; not User Modifiable)  
Number of Heat Stages (HT STG)  
Displays the number of furnace heating stages  
Input Rate (BTU/HR)  
Displays the furnace input rate in kBtu/hr  
Motor HP (1/2, ¾, or 1 MTR HP)  
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)  
Fault 4 (FAULT #4)  
Fault 5 (FAULT #5)  
Fault 6 (FAULT #6)  
Next most recent furnace fault  
Next most recent furnace fault  
Next most recent furnace fault  
Next most recent furnace fault  
Least recent furnace fault  
For display only  
For display only  
For display only  
For display only  
For display only  
Selecting “YES” clears the fault  
history  
Clear Fault History (CLEAR)  
NO or YES  
Consecutively repeated faults are shown a maximum of 3 times.  
NOTE:  
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  
SET-UP  
Submenu Item  
Heat Airflow Trim (HT TRM)  
User Modifiable Options  
-10% to +10% in 2% increments,  
default is 0%  
Comments  
Trims the heating airflow by the selected  
amount.  
Heat ON Delay (HT ON  
Heat OFF Delay (HT OFF)  
Heat Airflow (HT ADJ)  
5, 10, 15, 20, 25, or 30 seconds,  
default is 30 seconds  
30, 60, 90, 120, 150, or 180 seconds, Selects the indoor blower heat OFF delay  
default is 150 seconds  
Selects the indoor blower heat ON delay  
1, 2, 3, or 4  
Selects the nominal heating airflow (see  
Startup Procedure and Adjustment –  
Circulator Blower Speeds for additional  
information)  
STATUS  
Submenu Item  
Indication (for Display Only; not User Modifiable)  
Mode (MODE)  
CFM (CFM)  
Displays the current furnace operating mode  
Displays the airflow for the current operating mode  
45  
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COMFORTNET™ SYSTEM  
NON-COMM (APPLIES ONLY TO A CT COMPATIBLE FURNACE MATCHED  
WITH A NON-CT COMPATIBLE SINGLE STAGE AIR CONDITIONER)  
Submenu Item  
User Modifiable Options  
Comments  
Cool Airflow (CL CFM)  
18, 24, 30, 36, 42, 48, or 60, default Selects the airflow for the non-CT  
is 18  
compatible single stage AC unit  
Cool Airflow Trim (CL TRM)  
Cool Airflow Profile (CL PRFL)  
Cool ON Delay (CL ON)  
-10% to +10% in 2% increments,  
default is 0%  
A, B, C, or D, default is A  
Selects the airflow trim amount for the non-  
CT compatible single stage AC unit  
Selects the airflow profile for the non-CT  
compatible single stage AC unit  
Selects the indoor blower ON delay for the  
non-CT compatible single stage AC unit  
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  
Selects the indoor blower OFF delay for the  
non-CT compatible single stage AC unit  
THERMOSTAT MENU  
The indoor control is equipped with a bank of three dipswitches  
that provide biasing and termination functions for the communi-  
cations transmission lines. The outdoor control in the CT™  
compatible unit is equipped with a bank of two dipswitches that  
provide termination functions for the communications transmis-  
sion lines. Communications errors will result if these switches  
are not correctly set. The table below indicates the switch posi-  
tion for the bias and termination dipswitches along with the ex-  
pected voltages. Note that the ON position is the correct posi-  
tion for all bias and termination dipswitches.  
If this furnace is installed with a CT compatible heat pump, the  
system is recognized as a dual fuel system. The balance point  
temperature should be set via the thermostat advanced menu.  
Navigate to the THERMOSTAT menu. Press the INSTALLER  
CONFIG key. Navigate to the SETUP menu and press the IN-  
STALLER CONFIG button. Navigate to dF BAL PNT. Adjust  
the dual fuel system balance point using the back/forward ar-  
rows.  
DIAGNOSTICS  
OFF ON  
Accessing the furnace’s diagnostics menu provides ready ac-  
cess 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  
aboveinAccessingandNavigatingtheAdvancedFeaturesMenus.  
1
BIAS  
BIAS  
2
3
TERM  
Indoor Unit BIAS and TERMINATION Dipswitches  
The ComfortNet system is a fully communicating system, and  
thus, constitutes a network. Occasionally the need to trouble-  
shoot the network may arise. The integrated furnace control has  
some on-board tools that may be used to troubleshoot the net-  
work. These tools are: red communications LED, green receive  
(Rx) LED, and learn button.  
NOTE: It is highly recommended that the fault history be cleared  
when performing maintenance or servicing the furnace.  
NETWORKTROUBLESHOOTING  
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.  
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 data 1 is in-  
creasing 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.  
Learn button – Used to reset the network. Depress the  
button for approximately 2 seconds to reset the network.  
46  
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NORMAL SEQUENCE OF OPERATION  
LED  
LED  
Status  
Off  
Indication  
Possible Causes  
x None  
x Communications  
Failure  
Corrective Action(s)  
Notes & Cautions  
x Normal condition  
x Communications  
Failure  
x None  
x None  
1 Flash  
x Depress Learn Button x Depress once  
x Verify that bus BIAS  
and TERM  
dipswitches are in the  
ON position.  
quickly for a power-  
up reset  
x Depress and hold  
for 2 seconds for  
an out-of-box reset  
x None  
Red  
Communications  
LED  
2 Flashes  
Off  
x Out-of-box reset  
x Control power up  
x Learn button  
depressed  
x No power to furnace  
x Open fuse  
x Communications error  
x None  
x No power  
x Communications  
error  
x Check fuses and  
circuit breakers;  
replace/reset  
x Turn power OFF  
prior to repair  
x Replace blown fuse  
x Check for shorts in  
low voltage wiring in  
furnace/system  
x Reset network by  
depressing learn  
button  
x Check data 1/ data 2  
voltages  
1 Steady  
Flash  
x No network found  
x Broken/ disconnected  
data wire(s)  
x Furnace is installed as  
a legacy/ traditional  
system  
x Check  
x Turn power OFF  
prior to repair  
x Verify wires at  
terminal blocks are  
securely twisted  
together prior to  
inserting into  
communications  
wiring (data 1/ data 2  
wires)  
x Check wire  
connections at  
terminal block  
Green Receive  
LED  
terminal block  
x Verify furnace  
installation type  
(legacy/ traditional or  
communicating)  
x Check data 1/ data 2  
voltages  
x Verify data1 and  
data voltages as  
described above  
Rapid  
Flashing  
On Solid  
x Normal network  
traffic  
x Data 1/ Data 2  
miss-wire  
x Control is “talking” on  
network as expected  
x Data 1 and data 2  
wires reversed at  
furnace, thermostat,  
or CT™ compatible  
outdoor AC/HP  
x Short between data 1  
and data 2 wires  
x Short between data 1  
or data 2 wires and R  
(24VAC) or C (24VAC  
common)  
x None  
x None  
x Check  
x Turn power OFF  
prior to repair  
x Verify wires at  
terminal blocks are  
securely twisted  
together prior to  
inserting into  
communications  
wiring (data 1/ data 2  
wires)  
x Check wire  
connections at  
terminal block  
x Check data 1/ data 2  
voltages  
terminal block  
x Verify data1 and  
data voltages as  
described above  
SYSTEMTROUBLESHOOTING  
115 VAC power applied to furnace.  
Integrated control module performs internal checks.  
NOTE: Refer to the instructions accompanying the CT compatible  
outdoorAC/HPunit for troubleshooting information.  
Integrated control module displays 88on dual 7-segment  
display LED’s.  
Refer to theTroubleshooting Chart in theAppendix for a listing of  
possible furnace error codes, possible causes and corrective  
actions.  
Integrated control module monitors safety circuits  
continuously.  
Furnaceawaitscallfromthermostat. Dual7-segmentLED’s  
display 0Pwhile awaiting call from thermostat.  
NORMAL SEQUENCE OF OPERATION  
HEATINGMODE  
POWER UP  
The normal operational sequence in heating mode is as follows:  
The normal power up sequence is as follows:  
R and W1 (or R and W1/W2) thermostat contacts close,  
initiating a call for heat.  
47  
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OPERATIONAL CHECKS & SAFETY CIRCUIT DESCRIPTION  
the balance of the heat off delay period (60, 90, 120 or 150  
seconds).  
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.  
Circulator blower and electronic air cleaner terminal is de-  
energized.  
CirculatorblowerrampsdowntoOFFduringthe30seconds  
following the heat off delay period.  
Induceddraftblowerstepstolowspeedfollowingprepurge.  
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.  
Furnace awaits next call from thermostat.  
COOLINGMODE  
Gasvalveopensatendofigniterwarmupperiod, delivering  
gas to burners and establishing flame.  
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 monitors flame presence. Gas  
valve will remain open only if flame is detected.  
Integrated control module performs safety circuit checks.  
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.  
Outdoor fan and compressor are energized to their  
appropriatespeed.  
Circulatorblowerisenergizedontheappropriatecoolspeed  
at the level and time determined by the selected ramping  
profile. Electronic air cleaner terminal is energized with  
circulator blower.  
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 circulator blower and outdoor cooling unit run their  
appropriate speeds, integrated control module monitors  
safety circuits continuously.  
Furnace is now operating on the specified stage called for  
by the two-stage thermostat.  
Furnace runs, integrated control module monitors safety  
circuits continuously.  
R and Y1/G or Y2/G thermostat contacts open, completing  
the call for cool.  
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.  
Outdoor fan and compressor are de-energized.  
Circulator blower continues running during a cool off delay  
period. TheOFFdelaytimeandairflowlevelaredetermined  
by the selected ramping profile.  
Electronic air cleaner terminal and circulator blower are de-  
energized.  
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  
Furnace awaits next call from thermostat.  
FANONLYMODE  
speed.  
The normal operational sequence in fan only mode is as follows:  
R and W1 (or R and W1/W2) thermostat contacts open,  
completing the call for heat.  
R and G thermostat contacts close, initiating a call for fan.  
Integrated control module performs safety circuit checks.  
Gas valve closes, extinguishing flame.  
Circulatorblowerisenergizedoncontinuousfanspeed(30%  
of the furnace’s maximum airflow capability) following a five  
(5)seconddelay. Electronicaircleanerterminalisenergized.  
Induceddraftblowerisde-energizedfollowingafifteensecond  
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  
runduringthisperioddependsonthelastheatcallprovided  
by the thermostat.  
Ifthelastcallforheatwasacallforlowheat, theaircirculator  
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  
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.  
48  
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TROUBLESHOOTING & MAINTENANCE  
the coil front cover. These switches guard against insufficient air-  
flow(combustionairandflueproducts)throughtheheatexchanger  
and/or blocked condensate drain conditions.  
OPERATIONAL CHECKS  
The burner flames should be inspected with the burner compart-  
ment 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.  
FLAMESENSOR  
The flame sensor is a probe mounted to the burner/manifold as-  
sembly which uses the principle of flame rectification to determine  
the presence or absence of flame.  
TROUBLESHOOTING  
ELECTROSTATICDISCHARGE(ESD)PRECAUTIONS  
NOTE: Discharge body’s static electricity before touching unit.  
An electrostatic discharge can adversely affect electrical  
components.  
Use the following precautions during furnace installation and ser-  
vicing to protect the integrated control module from damage. By  
putting the furnace, the control, and the person at the same elec-  
trostatic potential, these steps will help avoid exposing the inte-  
grated control module to electrostatic discharge. This procedure  
is applicable to both installed and uninstalled (ungrounded) fur-  
naces.  
1. Disconnect all power to the furnace. Do not touch the  
integrated control module or any wire connected to the  
controlprior todischargingyourbody’selectrostatic charge  
toground.  
Burner Flame  
SAFETY CIRCUIT DESCRIPTION  
Anumberofsafetycircuitsareemployedtoensuresafeandproper  
furnace operation. These circuits serve to control any potential  
safety hazards and serve as inputs in the monitoring and diagno-  
sis of abnormal function. These circuits are continuously moni-  
tored during furnace operation by the integrated control module.  
2. Firmlytouchaclean, unpainted, metalsurfaceofthefurnace  
away from the control. Any tools held in a person’s hand  
during grounding will be discharged.  
INTEGRATEDCONTROLMODULE  
The integrated control module is an electronic device which, if a  
potential safety concern is detected, will take the necessary pre-  
cautions and provide diagnostic information through an LED.  
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  
moveorshuffleyourfeet, donottouchungroundedobjects,  
etc.). If you come in contact with an ungrounded object,  
repeat step 2 before touching control or wires.  
PRIMARY LIMIT  
The primary limit control is located on the partition panel and moni-  
tors heat exchanger compartment temperatures. It is a normally-  
closed (electrically), automatic reset, temperature-activated sen-  
sor. The limit guards against overheating as a result of insufficient  
conditioned air passing over the heat exchanger.  
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  
controlstotheircontainersbeforetouchinganyungrounded  
object.  
AUXILIARYLIMIT  
The auxiliary limit controls are located on or near the circulator  
blowerandmonitorsblowercompartmenttemperatures. Theyare  
a normally-closed (electrically), manual-reset sensors. These lim-  
its guard against overheating as a result of insufficient conditioned  
air passing over the heat exchanger.  
DIAGNOSTICCHART  
WARNING  
HIGH VOLTAGE !  
ROLLOUT LIMIT  
TO AVOID PERSONAL INJURY OR DEATH DUE TO  
ELECTRICAL SHOCK, DISCONNECT ELECTRICAL POWER  
BEFORE PERFORMING ANY SERVICE OR MAINTENANCE.  
The rollout limit controls are mounted on the burner/manifold as-  
sembly and monitor the burner flame. They are normally-closed  
(electrically), manual-reset sensors. These limits guard against  
burner flames not being properly drawn into the heat exchanger.  
Refer to the Troubleshooting Chart in theAppendix for assistance  
indeterminingthesourceofunitoperationalproblems. Thedual7-  
segment LED display will display an error code that may contain a  
letter and number.The error code may be used to assist in trouble-  
shooting the unit.  
PRESSURESWITCHES  
The pressure switches are normally-open (closed during opera-  
tion) negative air pressure-activated switches. They monitor the  
airflow (combustion air and flue products) through the heat ex-  
changer via pressure taps located on the induced draft blower and  
49  
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TROUBLESHOOTING & MAINTENANCE  
RESETTINGFROMLOCKOUT  
FILTERS  
Furnace lockout results when a furnace is unable to achieve igni-  
tion after three attempts during a single call for heat. It is charac-  
terized by a non-functioning furnace and a E0code 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.  
CAUTION  
TO ENSURE PROPER UNIT PERFORMANCE, ADHERE TO THE FILTER SIZES  
GIVEN IN THE RECOMMENDED MINIMUM FILTER SIZE TABLE OR  
SPECIFICATION SHEET APPLICABLE TO YOUR MODEL.  
1. Automatic reset. The integrated control module will  
automatically reset itself and attempt to resume normal  
operations following a one hour lockout period.  
FILTERMAINTENANCE  
Improper filter maintenance is the most common cause of inad-  
equate heating or cooling performance. Filters should be cleaned  
(permanent) or replaced (disposable) every two months or as re-  
quired. When replacing a filter, it must be replaced with a filter of  
the same type and size.  
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.  
FILTER REMOVAL  
NOTE: If the condition which originally caused the lockout still  
exists, thecontrolwillreturntolockout. RefertotheTroubleshooting  
Chart for aid in determining the cause.  
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). Amedia 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.  
MAINTENANCE  
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.  
To remove filters from an external filter rack in an upright upflow  
installation, follow the directions provided with external filter rack  
kit.  
HORIZONTAL UNIT FILTER REMOVAL  
Filters in horizontal installations are located in the central return  
register or the ductwork near the furnace.  
Toremove:  
ANNUALINSPECTION  
1. Turn OFF electrical power to furnace.  
2. Removefilter(s)fromthecentralreturnregisterorductwork.  
3. Replace filter(s) by reversing the procedure for removal.  
4. Turn ON electrical power to furnace.  
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 fur-  
nace components are in proper working order and that the heating  
system functions appropriately. Pay particular attention to the fol-  
lowing items. Repair or service as necessary.  
MEDIA AIR FILTER OR ELECTRONIC AIR CLEANER REMOVAL  
Follow the manufacturer’s directions for service.  
Flue pipe system. Check for blockage and/or leakage.  
Check the outside termination and the connections at  
and internal to the furnace.  
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.  
Heatexchanger. Checkforcorrosionand/orbuildupwithin  
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.  
INDUCEDDRAFTANDCIRCULATORBLOWERS  
The bearings in the induced draft blower and circulator blower mo-  
tors 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.  
50  
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MISCELLANEOUS  
CONDENSATETRAPANDDRAINSYSTEM(QUALIFIEDSERVICER  
ONLY)  
BEFORE LEAVING AN INSTALLATION  
Cycle the furnace with the thermostat at least three times.  
Verify cooling and fan only operation.  
Annuallyinspectthedraintubes, draintrap, andfield-supplieddrain  
line for proper condensate drainage. Check drain system for hose  
connection tightness, blockage, and leaks. Clean or repair as  
necessary.  
Review the Owner’s Manual with the homeowner and  
discuss proper furnace operation and maintenance.  
Leave literature packet near furnace.  
FLAMESENSOR(QUALIFIEDSERVICERONLY)  
REPAIR AND REPLACEMENT PARTS  
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 clean-  
ing, the flame sense signal should be as indicated in the Specifica-  
tions Sheet.  
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,  
all sheet metal parts, doors, etc. may be ordered by  
description.  
Parts are available from your distributor.  
FLUEPASSAGES(QUALIFIEDSERVICERONLY)  
Functional Parts List-  
Gas Valve  
Blower Motor  
The heat exchanger flue passageways should be inspected at the  
beginning of each heating season. If necessary, clean the pas-  
sageways as outlined below.  
1. TurnOFFtheelectricalpowerandgassupplytothe furnace.  
2. Disconnect the gas line and remove the burner/ manifold  
assembly by removing the screws securing the assembly  
to the partition panel.  
3. Disconnect the flue pipe system from the induced draft  
blower.  
4. Remove the induced draft blower, drain and pressure tap  
hoses from the recuperator coil front cover.  
Gas Manifold  
Blower Wheel  
Natural Gas Orifice  
Propane Gas Orifice  
Igniter  
Blower Mounting Bracket  
BlowerCutoff  
BlowerHousing  
Inductor  
Flame Sensor  
Rollout Limit Switch  
Primary Limit Switch  
Auxiliary Limit Switch  
Pressure Switch  
InducedDraftBlower  
Door Switch  
Heat Exchanger with  
RecuperatorCoil  
CoilFrontCover  
IntegratedControlModule  
Transformer  
5. Remove the recuperator coil front cover to expose the coil  
tubes and turbulators.  
6. Remove the recuperator coil turbulators individually by  
slowly pulling each turbulator forward firmly.  
7. Clean the recuperator coil tubes using a long handle wire  
brush, such as a gun cleaning brush.  
8. Clean the primary heat exchanger tubes using a wire brush  
attached to a length of high grade stainless steel cable,  
such as drain cleanout cable. Attach a variable speed  
reversible drill to the other end of the cable. Slowly rotate  
the cable with the drill and insert it into one of the heat  
exchanger tubes. While reversing the drill, work the cable  
inandoutseveraltimestoobtainsufficientcleaning. Repeat  
for each tube.  
9. Clean residue from furnace using a vacuum cleaner.  
10. Replace the parts removed in the previous steps in reverse  
order.  
11. Turn on electrical power and gas to furnace. Check for  
leaks and proper unit operation.  
12. Severe heat exchanger fouling is an indication of an  
operational problem. Perform the checks listed in Startup  
Procedure and Adjustments to reduce the chances of  
repeatedfouling.  
51  
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DIP SWITCHES  
DIP Sw itch No.  
Sw itch  
Purpose  
Bank  
Function  
1
OFF  
ON  
OFF  
ON  
---  
2
OFF  
OFF  
ON  
ON  
---  
3
---  
4
---  
5
---  
---  
---  
---  
---  
---  
---  
---  
---  
---  
---  
---  
---  
---  
---  
---  
---  
---  
OFF  
ON  
OFF  
ON  
---  
---  
---  
---  
---  
---  
6
---  
---  
---  
---  
---  
---  
---  
---  
---  
---  
---  
---  
---  
---  
---  
---  
---  
---  
OFF  
OFF  
ON  
ON  
---  
---  
---  
---  
---  
---  
7
---  
---  
---  
---  
---  
---  
---  
---  
---  
---  
---  
---  
---  
---  
---  
---  
---  
---  
---  
---  
---  
---  
OFF  
ON  
OFF  
ON  
---  
---  
8
---  
---  
---  
---  
---  
---  
---  
---  
---  
---  
---  
---  
---  
---  
---  
---  
---  
---  
---  
---  
---  
---  
OFF  
OFF  
ON  
ON  
---  
---  
9
---  
---  
---  
---  
---  
---  
---  
---  
---  
---  
---  
---  
---  
---  
---  
---  
---  
---  
---  
---  
---  
---  
---  
---  
---  
---  
OFF  
ON  
10  
---  
90 seconds  
120 seconds  
150 seconds*  
180 seconds  
1-Stage T-stat  
Heat OFF  
Delay  
---  
---  
---  
---  
---  
---  
---  
---  
---  
S1  
OFF  
ON  
---  
---  
---  
Thermostat 2-Stage T-Stat  
---  
---  
---  
---  
Setup  
5-Min Delay  
---  
---  
OFF  
ON  
---  
---  
Auto Delay  
---  
---  
---  
---  
Bus BIAS  
TERM  
BIAS  
ON*  
---  
ON*  
---  
---  
---  
S2  
S3  
Bus Termination  
ON*  
---  
---  
---  
A
OFF  
ON  
OFF  
ON  
---  
OFF  
OFF  
ON  
ON  
---  
---  
---  
Cooling  
B
---  
---  
---  
Speed Tap  
C
---  
---  
---  
D*  
---  
---  
---  
Normal*  
OFF  
ON  
OFF  
ON  
---  
OFF  
OFF  
ON  
ON  
---  
---  
Adjust  
Taps  
10%  
---  
---  
---  
-10%  
---  
---  
---  
Normal  
---  
---  
---  
A*  
---  
---  
---  
Ramping  
Profiles  
B
---  
---  
---  
---  
---  
C
---  
---  
---  
---  
---  
D
---  
---  
---  
---  
---  
S4  
A
---  
---  
---  
---  
---  
Heating  
B*  
C
---  
---  
---  
---  
---  
Speed Tap  
---  
---  
---  
---  
---  
D
---  
---  
---  
---  
---  
Disabled*  
Enabled  
---  
---  
---  
---  
Unused  
Unused  
DEHUM  
S5  
---  
---  
---  
---  
(*Indicates factory setting)  
---  
Not applicable  
52  
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TROUBLESHOOTING CHART  
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TROUBLESHOOTING CHART  
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TROUBLESHOOTING CHART  
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TROUBLESHOOTING CHART  
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TROUBLESHOOTING CHART  
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STATUS CODES  
INTERNAL CONTROL FAULT/NO POWER  
NORMAL OPERATION  
O P  
E 0  
E 1  
E 2  
E 3  
E 4  
E 5  
E 6  
E 7  
E 8  
E 9  
E A  
d 0  
d 4  
b 0  
b 1  
b 2  
b 3  
b 4  
b 5  
b 6  
b 7  
b 9  
C 1  
C 2  
LOCKOUT DUE TO EXCESSIVE RETRIES  
LOW STAGE PRESSUE SWITCH STUCK CLOSED AT START OF HEATING CYCLE  
LOW STAGE PRSSURE SWITCH STUCK OPEN  
OPEN HIGH LIMIT SWITCH  
FLAME DETECTED WHEN NO FLAME SHOULD BE PRESENT  
OPEN FUSE  
LOW FLAME SIGNAL  
IGNITER FAULT OR IMPROPER GROUNDING  
HIGH STAGE PRESSURE SWITCH STUCK CLOSED AT START OF HEATING CYCLE  
HIGH STAGE PRSSURE SWITCH STUCK OPEN  
REVERSED 115 VAC POLARITY  
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  
BLOWER MOTOR LOCKED ROTOR  
OVER/UNDER VOLTAGE TRIP OR OVER TEMPERATURE TRIP  
INCOMPLETE PARAMETERS SENT TO MOTOR  
LOW INDOOR AIRFLOW  
LOW STAGE COOL  
HIGH STAGE COOL  
LOW STAGE HEAT  
L 0  
H I  
F
HIGH STAGE HEAT  
CONTINUOUS FAN  
CFM/100; ALTERNATES WITH  
,
,
,
,
H I  
C 2 L O  
F
1 2  
C 1  
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*CVC9_AA, *MVC95_AA  
WIRING DIAGRAM  
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.  
TO  
GND  
115 VAC/ 1Ø /60 HZ  
POWER SUPPLY WITH  
OVERCURRENT  
ID BLOWER TWO-STAGE PRESSURE  
SWITCH ASSEMBLY  
PROTECTION DEVICE  
L
WARNING:DISCONNECT  
POWER BEFORE  
SERVICING. WIRING  
TO UNIT MUST BE  
PROPERLY POLARIZED  
AND GROUNDED.  
BK  
24V HUM.  
OR  
HIGH FIRE  
PRESSURE  
SWITCH  
HOT  
SURFACE  
IGNITER  
LOW FIRE  
PRESSURE  
SWITCH  
N
C
WH  
C
NO  
NO  
DISCONNECT  
2 CIRCUIT  
2
1
CONNECTOR  
TO 115VAC/ 1Ø /60 HZ POWER SUPPLY WITH  
OVERCURRENT PROTECTION DEVICE  
OR  
3
HI  
PU  
GND  
L
N
2
BR  
C
FLAME  
SENSOR  
WARNING:  
TWO STAGE  
GAS VALVE  
DISCONNECT POWER  
BEFORE SERVICING.  
WIRING TO UNIT  
C
1
GY  
PM  
GY  
NO  
FRONT COVER  
PRESSURE SWITCH  
MUST BE PROPERLY  
POLARIZED AND  
GROUNDED.  
DISCONNECT  
MANUAL RESET ROLLOUT LIMIT  
CONTROLS (SINGLE CONTROL ON  
45 kBTU)  
BL  
PK  
OR  
DOOR  
SWITCH  
JUNCTION BOX  
AUTO RESET PRIMARY  
LIMIT CONTROL  
INDUCTOR COIL  
70kBTU,90kBTU,  
115kBTU MODELS  
ONLY  
PU  
INDUCED  
DRAFT  
BLOWER  
INDOOR  
AIR  
CIRCULATOR  
BLWR  
3
WH  
2
RD  
1
BK  
GND  
GND  
BURNER COMPARTMENT  
BLOWER COMPARTMENT  
LINE  
EAC  
NEUTRAL  
NEUTRAL  
ELECTRONIC  
AIR CLEANER  
PU  
MANUAL RESET  
AUXILIARY  
LIMIT CONTROL  
YL  
IND HI  
NEUTRAL  
ID  
BLWR  
IND LO  
HUM  
24 V THERMOSTAT CONNECTIONS  
FUSE  
24 V  
3 A  
NEUTRAL  
NEUTRAL  
HUMIDIFIER  
IGN  
FS  
HOT SURFACE  
IGNITER  
BR  
SEE  
NOTE  
DIAGNOSTIC  
LED'S  
5
3
6
2
1
4
OR  
FLAME SENSOR  
11 5 VAC  
5
OR  
OR  
2ND STG DLY  
T-STAT  
NEUTRAL  
LINE  
9
7
8
HEAT OF F  
DELAY  
10  
40 VA  
TRANSFORMER  
12  
15  
11  
PK  
GY  
BR  
FUSE 3A  
TH (4)  
UNU SED  
DEHUM  
R
13  
14  
24 VAC  
MANU AL RESET AUXILIARY LIMIT  
AUTO RESET PRIM ARY  
LIMIT CON TROL  
HEAT  
CONTROLS  
TO +VDC  
PU  
1
2
YL  
HLO (10)  
PSO (7)  
Y1  
DELAY  
OR  
GY  
3
4
ADJUST  
COOL  
24  
LOW FIRE  
PRESS. SWITCH  
C
VAC  
24V HUM.  
NO  
W1  
W2  
PS1 (2)  
115  
VAC  
BL  
NO  
LINE  
PS2 (12)  
40 VA  
TRANSFORMER  
TO  
MICR O  
1
2
3
4
5
C
BK  
Y2  
G
HIGH FIRE  
PRESS. SWTICH  
HLI (1)  
MANUAL RESET ROLLOUT  
LIMIT CONTROLS  
FS  
WH  
O
NEUTRAL  
WH  
DEHUM  
MVL (13)  
NO  
PM  
C
FRONT COVER  
PRESS. SWIT CH  
MVH (14)  
HI  
RD  
C
BL  
MVC (8)  
ECM MTR  
HARNESS  
WH  
C
WH  
GAS  
VALVE  
GND (5)  
TR (11)  
GY  
BK  
BK  
BK  
GND  
BK  
5
BK  
TO  
GND (4)  
4
3
2
1
WH  
R
GR  
PK  
+ VDC (1)  
GND  
BLOWER  
INDOOR  
AIR  
RX (2)  
TX (3)  
COMPARTMENT  
DOOR SWITCH  
(OPEN WHEN  
DOOR OPEN)  
TO  
MICRO  
CIRCULATOR  
BLWR  
CIRCULATOR  
BLOWER  
INDUCTOR COIL  
70kBTU,90kBTU,  
115kBTU MODELS  
ONLY  
INTEGRATED CONTROL MODU LE  
HUMIDIFIER  
NOTES:  
1. SET HEAT ANTICIPATOR ON ROOM THERMOSTAT AT 0.7 AMPS.  
EQUIPMENT GND  
FIELD GND  
LOW VOLTAGE (24V)  
COLOR CODES:  
PK PINK  
BR BROWN  
WH WHITE  
BL BLUE  
LOW VOLTAGE FIELD  
HI VOLTAGE (115V)  
HI VOLTAGE FIELD  
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  
WIRING MATERIAL HAVING A TEMPERATURE RATING OF  
AT WITH LEAST 105°C. USE COPPER CONDUCTORS.  
FIELD SPLICE  
SWITCH (TEMP.)  
IGNITER  
GY GRAY  
RD RED  
JUNCTION  
TERMINAL  
INTERNAL TO  
4. UNIT MUST BE PERMANENTLY GROUNDEDAND CONFORM TO  
N.E.C. AND LOCAL CODES.  
YL YELLOW  
OR ORANGE  
PU PURPLE  
GN GREEN  
BK BLACK  
5. TO RECALL THE LAST 6 FAULTS, MOST RECENT TO LEAST  
RECENT, DEPRESS SWITCH FOR MORE THAN 2 SECONDS  
IN STANDBY (NO THERMOSTAT INPUTS).  
SWITCH (PRESS.)  
INTEGRATED CONTROL  
OVERCURRENT  
PROT. DEVICE  
PLUG CONNECTION  
0140F00530 REV. B  
Wiring is subject to change. Always refer to the wiring diagram on the unit for the most up-to-date wiring.  
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WIRING DIAGRAM  
*CVC9_AB, *MVC95_AB  
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.  
TO  
GND  
115VAC/1 Ø/60HZ  
POWERSUPPLYWITH  
OVERCURRENT  
IDBLOWERTWO-STAGEPRESSURE  
SWITCHASSEMBLY  
PROTECTIONDEVICE  
L
WARNING:DISCONNECT  
POWERBEFORE  
SERVICING.WIRING  
TOUNITMUSTBE  
PROPERLYPOLARIZED  
ANDGROUNDED.  
BK  
24VHUM.  
OR  
HIGHFIRE  
PRESSURE  
SWITCH  
HOT  
SURFACE  
IGNITER  
LOWFIRE  
PRESSUR  
ESWITCH  
N
C
WH  
C
NO  
NO  
DISCONNECT  
2CIRCUIT  
2
1
CONNECTOR  
TO115VAC/1 Ø/60HZPOWERSUPPLYWITH  
OVERCURRENTPROTECTIONDEVICE  
OR  
2
HI  
PU  
GND  
TWOSTAGE  
GASVALVE  
(HONEYWELL)  
L
N
3
BR  
C
FLAME  
SENSOR  
WARNING:  
DISCONNECTPOWER  
BEFORESERVICING.  
WIRINGTOUNIT  
C
1
GY  
PM  
GY  
NO  
FRONTCOVER  
PRESSURESWITCH  
MUSTBEPROPERLY  
POLARIZEDAND  
GROUNDED.  
DISCONNECT  
MANUALRESETROLLOUTLIMIT  
CONTROLS(SINGLECONTROLON  
45kBTU)  
BL  
PK  
OR  
DOOR  
SWITCH  
JUNCTIONBOX  
AUTORESETPRIMARY  
LIMITCONTROL  
INDUCTORCOIL  
70kBTU,90kBTU,  
115kBTUMODELS  
ONLY  
PU  
INDUCED  
DRAFT  
BLOWER  
INDOOR  
AIR  
CIRCULATOR  
BLWR  
3
2
1
WH  
RD  
BK  
GND  
GND  
BURNERCOMPARTMENT  
BLOWERCOMPARTMENT  
NEUTRAL  
NEUTRAL  
LINE  
EAC  
ELECTRONIC  
AIRCLEANER  
PU  
YL  
MANUALRESET  
AUXILIARY  
LIMITCONTROL  
INDHI  
NEUTRAL  
ID  
BLWR  
INDLO  
HUM  
24VTHERMOSTATCONNECTIONS  
FUSE  
24V  
3A  
NEUTRAL  
NEUTRAL  
HUMIDIFIER  
IGN  
FS  
HOTSURFACE  
IGNITER  
BR  
SEE  
NOTE5  
DIAGNOSTIC  
LED'S  
3
6
2
5
1
4
OR  
OR  
OR  
FLAMESENSOR  
115VAC  
2NDSTGDLY  
T-STAT  
NEUTRAL  
LINE  
9
7
8
HEATOFF  
DELAY  
10  
40VA  
TRANSFORMER  
12  
15  
11  
PK  
GY  
FUSE3A  
TH(4)  
UNUSED  
DEHUM  
R
13  
14  
24VAC  
AUTORESETPRIMARY  
MANUALRESETAUXILIARYLIMIT  
CONTROLS  
LIMITCONTROL  
BR  
HEAT  
TO+VDC  
PU  
1
2
YL  
HLO(10)  
Y1  
DELAY  
OR  
GY  
3
4
PSO(7)  
PS1(2)  
ADJUST  
COOL  
24  
LOWFIREPRESS.  
SWITCH  
C
VAC  
24VHUM.  
NO  
W1  
W2  
115  
VAC  
BL  
NO  
LINE  
PS2(12)  
40VA  
TRANSFORMER  
TO  
1
2
3
4
5
C
BK  
MICRO  
Y2  
G
HIGHFIRE  
PRESS.SWTICH  
MANUALRESETROLLOUT  
LIMITCONTROLS  
FS  
HLI(1)  
WH  
O
NEUTRAL  
WH  
DEHUM  
MVL(13)  
NO  
PM  
HI  
C
FRONTCOVER  
PRESS.SWITCH  
C
MVH(14)  
RD  
C
BL  
MVC(8)  
ECMMTR  
WH  
HARNESS  
WH  
BK  
GAS  
VALVE  
GND(5)  
TR(11)  
GY  
BK  
BK  
GND  
BK  
5
BK  
TO  
GND(4)  
+VDC(1)  
4
3
2
WH  
R
GR  
PK  
GND  
1
BLOWER  
INDOOR  
AIR  
CIRCULATOR  
BLWR  
RX(2)  
TX(3)  
COMPARTMENT  
DOORSWITCH  
(OPENWHEN  
DOOROPEN)  
TO  
MICRO  
CIRCULATOR  
BLOWER  
INDUCTORCOIL  
70kBTU,90kBTU,  
115kBTUMODELS  
ONLY  
INTEGRATEDCONTROLMODULE  
HUMIDIFIER  
NOTES:  
EQUIPMENTGND  
FIELDGND  
LOWVOLTAGE(24V)  
COLORCODES:  
PKPINK  
BRBROWN  
WHWHITE  
BLBLUE  
1.SETHEATANTICIPATORONROOMTHERMOSTATAT0.7AMPS.  
LOWVOLTAGEFIELD  
HIVOLTAGE(115V)  
HIVOLTAGEFIELD  
2.MANUFACTURER'SSPECIFIEDREPLACEMENTPARTSMUSTBE  
USEDWHENSERVICING.  
3.IFANYOFTHEORIGINALWIREASSUPPLIEDWITHTHE  
FURNACEMUSTBEREPLACED,ITMUSTBEREPLACEDWITH  
WIRINGMATERIALHAVINGATEMPERATURERATINGOFAT  
LEAST105°C.USECOPPERCONDUCTORSONLY.  
4.UNITMUSTBEPERMANENTLYGROUNDEDANDCONFORMTO  
N.E.C.ANDLOCALCODES.  
FIELDSPLICE  
SWITCH(TEMP.)  
IGNITER  
GYGRAY  
RDRED  
JUNCTION  
YLYELLOW  
ORORANGE  
PU PURPLE  
GNGREEN  
BKBLACK  
TERMINAL  
5.TORECALLTHELAST6FAULTS,MOSTRECENTTOLEAST  
RECENT,DEPRESSSWITCHFORMORETHAN2SECONDSWHILE  
INSTANDBY(NOTHERMOSTATINPUTS)  
SWITCH(PRESS.)  
INTERNALTO  
INTEGRATEDCONTROL  
OVERCURRENT  
PROT.DEVICE  
PLUGCONNECTION  
0140F00661  
REV.B  
Wiring is subject to change. Always refer to the wiring diagram on the unit for the most up-to-date wiring.  
60  
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