Amana GDH8 User manual

5151 San Felipe Suite 500 • Houston, TX 77056
www.goodmanmfg.com • www.amana-hac.com
©2011 - 2014 Goodman Manufacturing Company, L.P.
ATTENTION INSTALLING PERSONNEL
RECOGNIZE THIS SYMBOL AS A SAFETY PRECAUTION.
Installer: Affix all manuals adjacent to the unit.
Thesefurnacescomplywithrequirementsem-
bodiedintheAmericanNationalStandard /Na-
tional Standard of CanadaANSI Z21.47·CSA-
2.3GasFiredCentralFurnaces.
As a professional installer, you have an obligation to know the product better than the customer.
This includes all safety precautions and related items.
Priorto actual installation, thoroughly familiarize yourselfwith 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 listed below
for the applicable Specification Sheet referred to in this manual.
G OODMAN WILL NOT BE RESPONSIBLE FOR ANY INJURY OR PROPERTY
DAMAGE ARISING FROM IMPROPER SERVICE OR SERVICE PROCEDURES .
I
F YOU INSTALL OR PERFORM SERVICE ON THIS UNIT , YOU ASSUME
RESPONSIBILITY FOR ANY PERSONAL INJURY OR PROPERTY DAMAGE
WHICH MAY RESULT . M ANY JURISDICTIONS REQUIRE A LICENSE TO
INSTALL OR SERVICE HEATING AND AIR CONDITIONING EQUIPMENT .
WARNING
IO-446A
3/2014
INSTALLATION INSTRUCTIONS FOR *M(H,S)8 / GD(H,S)8 / GHS8 / GME8
ADS(H,S)8 / AMEH8 GAS FURNACE
(CATEGORYI)
is a registered trademark of Maytag Corporation or its related companies and is used under license. All rights reserved.

2
Table of Contents
SAFETY CONSIDERATIONS ............................................................................................................................ 5
ADDITIONAL SAFETY CONSIDERATIONS ...................................................................................................... 6
SHIPPING INSPECTION ........................................................................................................................... 6
ELECTROSTATIC DISCHARGE (ESD)PRECAUTIONS ..................................................................................... 6
TOTHE INSTALLER .............................................................................................................................. 7
PRODUCT APPLICATION ............................................................................................................................... 7
REMOVED WARRANTY SECTION.............................................................................................. 7
LOCATION REQUIREMENTS AND CONSIDERATIONS ................................................................................................ 8
CLEARANCES AND ACCESSIBILITY ............................................................................................................ 9
INSTALLATION POSITIONS ...................................................................................................................... 9
HORIZONTAL INSTALLATION .................................................................................................................. 10
FURNACE SUSPENSION ........................................................................................................................ 10
EXISTING FURNACE REMOVAL .............................................................................................................. 10
THERMOSTAT LOCATION ...................................................................................................................... 10
COMBUSTION AND VENTILATION AIR REQUIREMENTS...........................................................................................11
CATEGORY IVENTING (VERTICAL VENTING) .....................................................................................................11
EXTERIOR MASONRY CHIMNEYS (CATEGORY IFURNACES ONLY)......................................................................... 12
CHECKLIST SUMMARY ........................................................................................................................ 13
CHECK 1 -PROPER CHIMNEY TERMINATION. ............................................................................................. 13
CHECK 2-ANY SOLID OR LIQUID FUEL APPLIANCES VENTED INTO THIS CHIMNEY CHANNEL ...................................... 14
CHECK 3- CHIMNEY CROWN CONDITION................................................................................................. 14
CHECK 4- DEBRIS IN CLEANOUT .......................................................................................................... 14
CHECK 5- LINER CONDITION................................................................................................................ 14
CHECK 6- DILUTION AIR. ................................................................................................................... 15
CHECK 7- COMPLETE THE INSTALLATION. ............................................................................................... 15
FIX 1- LINER TERMINATION ................................................................................................................. 15
FIX 2-CHANGE VENTING ARRANGEMENTS ............................................................................................... 15
FIX 3-REBUILD THE CROWN ............................................................................................................... 15
FIX 4- RELINING .............................................................................................................................. 16
ELECTRICAL CONNECTIONS ........................................................................................................................ 16
WIRING HARNESS .............................................................................................................................. 17
115VOLT LINE CONNECTIONS ............................................................................................................. 17
FOSSIL FUEL APPLICATIONS ................................................................................................................ 17
JUNCTION BOX RELOCATION ................................................................................................................ 17
24VOLT THERMOSTAT WIRING ............................................................................................................ 18
GME8/AMEH8FURNACE WITH 2-STAGE CONDENSER FIELD WIRING ........................................................ 18
SETTING THE HEAT ANTICIPATOR ........................................................................................................... 18
115VOLT LINE CONNECTION OF ACCESSORIES ........................................................................................ 19
ELECTRONICAIR CLEANER .................................................................................................................. 19
24VAC HUMIDIFIER .......................................................................................................................... 19
GAS SUPPLY AND PIPING ........................................................................................................................... 19
HIGH ALTITUDE DERATE ...................................................................................................................... 20
PROPANE GAS CONVERSION ................................................................................................................ 20
GAS PIPING CONNECTIONS .................................................................................................................. 20
UPFLOW INSTALLATIONS ..................................................................................................................... 21
COUNTERFLOW INSTALLATIONS.............................................................................................................. 21
GAS PIPING CHECKS ......................................................................................................................... 21

3
Table of Contents
PROPANE GAS TANKS AND PIPING ......................................................................................................... 22
CIRCULATING AIR AND FILTERS .................................................................................................................... 22
DUCTWORK -AIR FLOW...................................................................................................................... 22
CHECKING DUCT STATIC ..................................................................................................................... 23
FILTERS -READ THIS SECTION BEFORE INSTALLING THE RETURN AIR DUCTWORK ............................................ 23
UPRIGHT INSTALLATIONS ..................................................................................................................... 23
CIRCULATION AIR FILTERS ................................................................................................................... 24
HORIZONTAL INSTALLATIONS ................................................................................................................ 24
SEQUENCE OF OPERATION (INTEGRATED IGNITION CONTROL) ................................................................................ 24
POWER UP...................................................................................................................................... 24
HEATING MODE ................................................................................................................................. 24
(MODE DIP SWITCH IS SET TO “1 STG”POSITION).................................................................................. 24
(MODE DIPSWITCH IS SET TO “2 STG” POSITION) ................................................................................. 24
COOLING MODE ................................................................................................................................25
FAN ONLY MODE .............................................................................................................................. 25
START-UP PROCEDUREANDADJUSTMENT ....................................................................................................... 25
FURNACE OPERATION .......................................................................................................................... 25
FURNACE START-UP ........................................................................................................................... 25
FURNACE SHUTDOWN ......................................................................................................................... 26
GAS SUPPLY PRESSURE MEASUREMENT .................................................................................................. 26
GAS MANIFOLD PRESSURE MEASUREMENT AND ADJUSTMENT ....................................................................... 28
GAS INPUT RATE MEASUREMENT (NATURAL GAS ONLY) ............................................................................ 29
TEMPERATURE RISE ........................................................................................................................... 30
CIRCULATOR BLOWER SPEED ADJUSTMENT ............................................................................................. 30
CIRCULATOR BLOWER FAN TIMING ADJUSTMENT ...................................................................................... 30
SETTING FURNACE OPERATING MODE (GDH8,GME8, *MH8,AMEH8 AND ADSH8 MODELS ONLY) ............. 31
OPERATIONAL CHECKS .............................................................................................................................. 31
BURNER FLAME ................................................................................................................................31
AUXILIARY LIMIT CONTROL ................................................................................................................. 31
SAFETY CIRCUIT DESCRIPTION .................................................................................................................... 32
GENERAL ......................................................................................................................................... 32
INTEGRATED CONTROL MODULE ............................................................................................................. 32
PRIMARY LIMIT ................................................................................................................................32
AUXILIARY LIMIT ............................................................................................................................... 32
ROLLOUT LIMITS .............................................................................................................................. 32
PRESSURE SWITCHES ......................................................................................................................... 32
FLAME SENSOR ................................................................................................................................32
TROUBLESHOOTING ................................................................................................................................... 32
ELECTROSTATIC DISCHARGE (ESD)PRECAUTIONS ................................................................................... 32
DIAGNOSTIC CHART........................................................................................................................... 32
FAULT RECALL ................................................................................................................................32
RESETTING FROM LOCKOUT ................................................................................................................ 33

4
Table of Contents
MAINTENANCE ......................................................................................................................................... 33
ANNUAL INSPECTION ........................................................................................................................... 33
FILTERS .......................................................................................................................................... 33
FILTER MAINTENANCE ......................................................................................................................... 33
FILTER REMOVAL .............................................................................................................................. 33
INDUCED DRAFT AND CIRCULATOR BLOWER MOTORS ................................................................................. 33
FLAME SENSOR (QUALIFIED SERVICER ONLY) .......................................................................................... 34
IGNITER (QUALIFIED SERVICER ONLY) ..................................................................................................... 34
BURNERS ......................................................................................................................................... 34
CLEANING (QUALIFIED SERVICER ONLY) ........................................................................................................ 34
BEFORE LEAVING AN INSTALLATION ............................................................................................................... 34
REPAIR AND REPLACEMENT PARTS .............................................................................................................. 34
COMPONENT ID................................................................................................................................ 35
TROUBLESHOOTING CHART .................................................................................................................. 36
APPENDIX ............................................................................................................................................... 37
TROUBLESHOOTING CHART .................................................................................................................. 37
TROUBLESHOOTING CHART .................................................................................................................. 37
TROUBLESHOOTING CHART .................................................................................................................. 38
BLOWER PERFORMANCE DATA ............................................................................................................. 39
*M(H/S)8................................................................................................................................. 39
GDS8 / ADSS8 & GHS8......................................................................................................... 40
BLOWER PERFORMANCE DATA ............................................................................................................. 41
GDH8 / ADSH8....................................................................................................................... 41
BLOWER PERFORMANCE DATA ............................................................................................................. 42
GME8 ..................................................................................................................................... 42
BLOWER PERFORMANCE DATA ............................................................................................................. 43
AMEH8................................................................................................................................... 43
*(M, D, H)S8 /ADSS8 WIRING DIAGRAM .......................................................................................... 44
GME8 / AMEH8 WIRING DIAGRAM WHITE RODGERS GAS VALVE .................................................... 45
GME8 / AMEH8 WIRING DIAGRAM HONEYWELLGAS VALVE ........................................................... 46
*(M,D)H8 / ADSH8 WIRING DIAGRAM WHITE RODGERS GAS VALVE................................................ 47
*(M,D)H8 / ADSH8 WIRING DIAGRAM HONEYWELLGAS VALVE ....................................................... 48

5
G OODMAN
DAMAGE ARISING FROM IMPROPER SERVICE OR SERVICE PROCEDURES .
I
F YOU INSTALL OR PERFORM SERVICE ON THIS UNIT , YOU ASSUME
RESPONSIBILITY FOR ANY PERSONAL INJURY OR PROPERTY DAMAGE
WHICH MAY RESULT . M ANY JURISDICTIONS REQUIRE A LICENSE TO
INSTALL OR SERVICE HEATING AND AIR CONDITIONING EQUIPMENT .
WILL NOT BE RESPONSIBLE FOR ANY INJURY OR PROPERTY
WARNING
S AFETY C ONSIDERATIONS
Adhereto the followingwarningsand cautions wheninstalling,
adjusting,altering,servicing, or operating the furnace. To en-
sure proper installation and operation, thoroughly read this
manualforspecificspertainingtotheinstallationand applica-
tion of this product.
This furnace is manufactured for use with natural gas. It may
befield convertedtooperate on L.P. gas byusingthe appropri-
ateL.P. conversionkitlistedinthe PROPANE GAS/HIGH AL-
TITUDE INSTALLATIONS section ofthis manual
Install this furnace only in a location and position as specified
inLOCATION REQUIREMENTS & CONSIDERATIONS sec-
tion and INSTALLATIONPOSITIONSsectionofthismanual.
Provideadequate combustionand ventilationairto thefurnace
as specified in COMBUSTION & VENTILATION AIR RE-
QUIREMENTS section of this manual.
Combustion products must be discharged to the outdoors.
Connectthisfurnacetoanapprovedventsystemonly,asspeci-
fiedinVENT/FLUE PIPE & COMBUSTION AIR PIPE section
of this manual.
Never test for gas leaks with an open flame. Use a commer-
cially available soap solution made specifically for the detec-
tion of leaks to check all connections, as specified in GAS
SUPPLYAND PIPING section of this manual.
Alwaysinstallafurnaceto operatewithinthefurnace’sintended
temperature-riserangewith a duct system which has external
staticpressurewithintheallowablerange,as specified on the
furnacerating plate and OPERATIONAL CHECKS sectionof
these instructions.
When a furnace is installed so that supply ducts carry air cir-
culated by the furnace to areas outside the space containing
the furnace, the return air shall also be handled by duct(s)
sealedto thefurnacecasingandterminating outsidethespace
containingthe furnace.
Agas-fired furnace for installationinaresidential garage must
beinstalledasspecifiedinthe LOCATION REQUIREMENTS
ANDCONSIDERATIONS section ofthismanual.
Thisfurnacemaybe used as a construction site heater only if
certain conditions are met. These conditions are listed in the
PRODUCTAPPLICATIONsectionof this manual.
T O PREVENT PERSONAL INJURY OR DEATH DUE TO IMPROPER
INSTALLATION , ADJUSTMENT , ALTERATION , SERVICE OR MAINTENANCE ,
REFER TO THIS MANUAL . F OR ADDITIONAL ASSISTANCE OR
INFORMATION , CONSULT A QUALIFIED INSTALLER , SERVICER AGENCY OR
THE GAS SUPPLIER .
WARNING
I F THE INFORMATION IN THESE INSTRUCTIONS IS NOT FOLLOWED
EXACTLY , A FIRE OR EXPLOSION MAY RESULT CAUSING PROPERTY
DAMAGE
, PERSONAL INJURY OR LOSS OF LIFE .
D O NOT STORE OR USE GASOLINE OR OTHER FLAMMABLE VAPORS AND
LIQUIDS IN THE VICINITY OF THIS OR ANY OTHER APPLIANCE .
D
O NOT TRY TO LIGHT ANY APPLIANCE .
D
O NOT TOUCH ANY ELECTRICAL SWITCH ; DO NOT USE ANY PHONE
IN YOUR BUILDING .
I
MMEDIATELY CALL YOUR GAS SUPPLIER FROM A NEIGHBOR ’ S
PHONE . F OLLOW THE GAS SUPPLIER ’ S INSTRUCTIONS .
I
F YOU CANNOT REACH YOUR GAS SUPPLIER , CALL THE FIRE
DEPARTMENT .
I
NSTALLATION AND SERVICE MUST BE PERFORMED BY A QUALIFIED
INSTALLER , SERVICE AGENCY OR THE GAS SUPPLIER .
WHAT TO DO IF YOU SMELL GAS:




WARNING
T HIS PRODUCT CONTAINS OR PRODUCES A CHEMICAL OR CHEMICALS
WHICH MAY CAUSE SERIOUS ILLNESS OR DEATH AND WHICH ARE
KNOWN TO THE S TATE OF C ALIFORNIA TO CAUSE CANCER , BIRTH
DEFECTS OR OTHER REPRODUCTIVE HARM .
WARNING
H EATING UNIT SHOULD NOT BE UTILIZED WITHOUT REASONABLE ,
ROUTINE , INSPECTION , MAINTENANCE AND SUPERVISION . I F 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 WATER - BEARING PIPES SHOULD BE DRAINED , THE BUILDING SHOULD
BE PROPERLY WINTERIZED , AND THE WATER SOURCE CLOSED . IN THE
EVENT THAT THE BUILDING MAY BE EXPOSED TO FREEZING
TEMPERATURES AND WILL BE VACANT , ANY HYDRONIC COIL UNITS
SHOULD BE DRAINED AS WELL AND , IN SUCH CASE , ALTERNATIVE HEAT
SOURCES SHOULD BE UTILIZED .
WARNING
T O PREVENT POSSIBLE PROPERTY DAMAGE , PERSONAL INJURY OR
DEATH DUE TO ELECTRICAL SHOCK , THE FURNACE MUST BE LOCATED TO
PROTECT THE ELECTRICAL COMPONENTS FROM WATER .
WARNING

6
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
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.
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.
B10259-216
S HOULD 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
P OSSIBLE 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 .
WARNING
T O PREVENT PERSONAL INJURY OR DEATH DUE TO IMPROPER
INSTALLATION , ADJUSTMENT , ALTERATION , SERVICE OR MAINTENANCE ,
REFER TO THIS MANUAL . F OR ADDITIONAL ASSISTANCE OR
INFORMATION , CONSULT A QUALIFIED INSTALLER , SERVICER AGENCY OR
THE GAS SUPPLIER .
WARNING
T O PREVENT PERSONAL INJURY OR DEATH DUE TO ASPHYXIATION , THIS
FURNACE MUST BE C ATEGORY I VENTED . D O NOT VENT USING
C
ATEGORY III VENTING .
P
ROVISIONS MUST BE MADE FOR VENTING COMBUSTION PRODUCTS
OUTDOORS THROUGH A PROPER VENTING SYSTEM . T HE LENGTH OF
FLUE PIPE COULD BE A LIMITING FACTOR IN LOCATING THE FURNACE .
WARNING
ADDITIONALSAFETYCONSIDERATIONS
• Thisfurnaceis approved for Category IVentingonly.
• Provisions must be made for venting combustion
products outdoors through a proper venting system.
The length of flue pipe could be a limiting factor in
locatingthefurnace.
SHIPPINGINSPECTION
All units are securely packed in shipping containers tested
according to International Safe Transit Association specifica-
tions. The carton must be checked upon arrival for external
damage. Ifdamageisfound,arequestforinspectionbycarrier’s
agent must be made in writing immediately.
Thefurnacemust be carefully inspected on arrivalfordamage
and bolts or screws which may have come loose in transit. In
theeventof damage the consignee should:
1. Makeanotationondeliveryreceiptofanyvisible damage
toshipmentor container.
2. Notifycarrier promptly and request an inspection.
3. Withconcealeddamage, carriermustbenotifiedassoon
aspossible - preferably within five days.
4. Filetheclaimwiththefollowingsupportdocumentswithin
a nine month statute of limitations.
• Original or certified copy of the Bill of Lading, or
indemnitybond.
• Originalpaidfreightbillorindemnityinlieuthereof.
• Originalor certified copy oftheinvoice,showing trade
andotherdiscountsor reductions.
• Copy of the inspection report issued by carrier’s
representativeatthetimedamageisreportedtocarrier.
Thecarrierisresponsible formakingpromptinspectionof dam-
ageandforathoroughinvestigationofeach claim.The distribu-
torormanufacturerwillnotacceptclaimsfromdealersfortrans-
portationdamage.
Keep this literature in a safe place for future reference.
ELECTROSTATICDISCHARGE (ESD)PRECAUTIONS
NOTE: Dischargebody’s staticelectricitybeforetouching unit.
Anelectrostaticdischarge can adversely affect electrical com-
ponents.
Use the following precautions during furnace installation and
servicing to protect the integrated control module from dam-
age. Byputtingthefurnace,thecontrol,andthepersonatthe
sameelectrostatic potential, these stepswillhelp avoid expos-
ing the integrated control module to electrostatic discharge.
Thisprocedure is applicabletobothinstalled andnon-installed
(ungrounded)furnaces.
1. Disconnect all power to the furnace. Do not touch the
integrated control module or any wire connected to the
control prior to discharging your body’s electrostatic
chargeto ground.

7
• The vent system is permanently installed per these
installation instructions.
• Aroomthermostatisusedtocontrolthefurnace. Fixed
jumpersthat provide continuousheatingCANNOT be
used.
• Returnairductsareprovidedandsealedtothefurnace.
• A return air temperature range between 60ºF (16ºC)
and80ºF(27ºC)ismaintained.
• Air filters are installed in the system and maintained
during construction, replaced as appropriate during
construction,and uponcompletionofconstruction are
replaced.
• The input rate and temperature rise are set per the
furnace ratingplate.
• 100% outside air is provided for combustion air
requirementsduringconstruction.Temporary ducting
can be used.
NOTE: Do not connect the temporary duct directly to
the furnace. The duct must be sized according to the
instructions under Combustion and Ventilation Air
Requirements,Section5.3.3.
•The furnace heat exchanger, components, duct
system,airfiltersand evaporator coils are thoroughly
cleanedfollowingfinalconstruction clean up.
• Allfurnaceoperatingconditions(includingignition,input
rate, temperature rise and venting) are verified
according to these installation instructions.
NOTE:TheCommonwealth ofMassachusetts requiresthatthe
followingadditionalrequirementsmustalsobemet:
• Gasfurnaces must be installedbya licensed plumber
orgas fitter.
• AT-handle gas cock must be used.
• Ifthe unit is to beinstalledinanattic, the passageway
to and the service area around the unit must have
flooring.
T O PREVENT PROPERTY DAMAGE , PERSONAL INJURY OR DEATH DUE TO
FIRE , DO NOT INSTALL THIS FURNACE IN A MOBILE HOME , TRAILER , OR
RECREATIONAL VEHICLE .
WARNING
To ensure proper furnace operation, install, operate and
maintain the furnace in accordance with these installa-
tion and operation instructions, all local building codes
and ordinances. In their absence, follow the latest edition of
the National Fuel Gas Code (NFPA54/ANSI Z223.1), and/or
CAN/CSA B149 Installation Codes, local plumbing or waste
watercodes,andotherapplicablecodes.
2. Firmly touch a clean, unpainted, metal surface of the
furnaces near the control. Any tools held in a person’s
handduring grounding willbedischarged.
3. Service integrated control module or connecting wiring
following the discharge process in step 2. Use caution
nottorechargeyourbodywithstaticelectricity;(i.e.,do
notmoveorshuffleyourfeet, do not touch ungrounded
objects,etc.). Ifyoucomeincontactwithanungrounded
object,repeatstep 2 before touching control or wires.
4. Discharge your body to ground before removing a new
control from its container. Follow steps 1 through 3 if
installing the control on a furnace. Return any old or
new controls to their containers before touching any
ungroundedobject.
TOTHE INSTALLER
Before installing this unit, please read this manual thoroughly
to familiarize yourself with specific items which must be ad-
hered to, including but not limited to: unit maximum external
static pressure, gas pressures, BTU input rating, proper elec-
tricalconnections, circulating air temperaturerise,minimum or
maximum CFM, and motor speed connections, and venting.
Thesefurnaces are designed forCategoryIventing only.
T O PREVENT PROPERTY DAMAGE , PERSONAL INJURY OR DEATH DUE TO
FIRE , DO NOT INSTALL THIS FURNACE IN A MOBILE HOME , TRAILER , OR
RECREATIONAL VEHICLE .
WARNING
P RODUCT A PPLICATION
Thisfurnace is primarilydesignedfor residential home-heating
applications. It is NOT designed or certified for use in mobile
homes,trailersorrecreationalvehicles. Neitherisitdesigned
or certified for outdoor applications. The furnace must be in-
stalled indoors (i.e., attic space, crawl space, or garage area
providedthe garage area is enclosedwithanoperating door).
This furnace can be used in the following non-industrial com-
mercialapplications:
Schools,Officebuildings,Churches,Retailstores,
Nursinghomes,Hotels/motels,Commonorofficeareas
In such applications , the furnace must be installed with the
followingstipulations:
• It must be installed per the installation instructions
providedandper 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
freeair delivery application.
• It must not be used as a “make-up” air unit.
• All other warranty exclusions and restrictions apply.
Thisfurnacemay be used as a construction site heater ONLY
ifthefollowingconditionsaremet:

8
Acopy of theNationalFuelGas Code (NFPA54/ANSI Z223.1)
canbeobtainedfromanyofthefollowing:
American National Standards Institute
1430Broadway
New York, NY 10018
National Fire Protection Association
1 Batterymarch Park
Quincy, MA 02269
CSA International
8501 East Pleasant Valley
Cleveland,OH44131
A copy of the CAN/CSA B149 Installation Codes can also be
obtainedfrom: CSA International
178RexdaleBoulevard
Etobicoke,Ontario,CanadaM9W1R3
The rated heating capacity of the furnace should be greater
than or equal to the total heat loss of the area to be heated.
Thetotalheatlossshouldbecalculatedbyanapprovedmethod
orinaccordancewith “ASHRAEGuide”or“ManualJ-Load Cal-
culations” published by the Air Conditioning Contractors of
America.
IntheUSA, this furnace MUST beinstalledinaccordance with
thelatestedition of theANSI Z223.1 booklet entitled “National
Fuel Gas Code” (NFPA54), and the requirements or codes of
thelocal utility orotherauthority having jurisdiction.InCanada,
this furnace must be installed in accordance with the current
CAN/CGA-B149.1&2GasInstallationCodes,localplumbing
or waste water codes and other applicable codes. Additional
helpful publications available from the NFPAare, NFPA90A-
InstallationofAirConditioningandVentilatingSystemandNFPA
90B - WarmAir Heating andAir Conditioning System.
AllventingshallbeinaccordancewithPART7,VentingofEquip-
ment, of the National Fuel Gas Code, ANSI Z223.1, or appli-
cablelocalbuildingand/or air conditioning codes. These pub-
licationsare available from:
National Fire Protection Association, Inc.
1 Batterymarch Park, Quincy, MA 02269
NOTE: Furnaces with NOx screens meet the California NOx
emission standards and California seasonal efficiency stan-
dards.ANNUALinspections of the furnace anditsvent system
isstronglyrecommended.
L OCATION R EQUIREMENTS AND C ONSIDERATIONS
Your unit model typedetermineswhichinstallationprocedures
must be used. For *MH8, *MS8, and GHS8 models, you must
follow instructions for Horizontal Left, Horizontal Right or Up-
flow installations only. These furnaces are not approved for
Downflowinstallations.
DownflowmodelsGD(H,S) ARENOTAPPROVED FORHORI-
ZONTAL OR UPFLOW INSTALLATIONS. For these models,
use only the instructions for downflow installation only.
T O PREVENT POSSIBLE EQUIPMENT DAMAGE , PROPERTY DAMAGE ,
PERSONAL INJURY OR DEATH , THE FOLLOWING BULLET POINTS MUST BE
OBSERVED WHEN INSTALLING THIS UNIT .
WARNING
Follow the instructions listed below when selecting a furnace
location. Refer also to the guidelines provided in Section V,
CombustionandVentilationAir Requirements.
• Centrally locate the furnace with respect to the
proposed or existing air distribution system.
• Ensure the temperature of the return air entering the
furnaceis between 55°F and 100°Fwhenthefurnace
is heating.
• If the furnace is installed in an application where the
typical operating sound level of a furnace is deemed
objectionable, an optional sound reduction kit is
available.Consultyourlocaldistributorformoredetails.
• Provisions must be made for venting combustion
products outdoors through a proper venting system.
The length of flue pipe could be a limiting factor in
locatingthefurnace.
• Ensure adequate combustion air is available for the
furnace. Improper or insufficient combustion air can
exposebuildingoccupantstogascombustionproducts
thatcould include carbon monoxide. RefertoSection
V, Combustion and VentilationAir Requirements.
• The furnace must be level. If the furnace is to be set
onafloorthatmaybecomewetordamp at times, the
furnace should be supported above the floor on a
concretebasesizedapproximately1-1/2" larger than
thebaseofthefurnace.
• Ensureupflowor horizontal furnaces are notinstalled
directly on carpeting, or any other combustible
material. The only combustible material allowed is
wood.
• Exposure to contaminated combustion air will result
in safety and performance-related problems. Do not
installthefurnace wherethecombustionairisexposed
tothe following substances:
chlorinated waxes or cleaners
chlorine-based swimming pool chemicals
water softening chemicals
deicing salts or chemicals
carbon tetrachloride
halogen type refrigerants
cleaning solutions (such as perchloroethylene)
printing inks
paint removers
varnishes
hydrochloric acid
cements and glues
antistatic fabric softeners for clothes dryers
and masonry acid washing materials

9
Top - 1"
Side
Clearance - 1"
Back - 0"
Front Clearance - 3"
V
ent Pipe Clearance to Combustibles-
6" using Single Wall Connector or 1"
using B-1 vent.
• Adequatecombustion/ventilation airmust besupplied
to the closet.
• Furnacemustbe completelysealedtofloororbase.
Combustion/ ventilation air supply pipes must
terminate 12" from top of closet and 12" from floor of
closet. DO NOT remove solid base plate for side
return.
• Return air ducts must be completely sealed to the
furnaceandterminateoutside theenclosure surfaces.
CLEARANCESANDACCESSIBILITY
Unobstructed front clearance of 24" for servicing is recom-
mended.
TOP
B1-VENT SINGLE (PLENUM)
1" 6" 1" 3" 0" 1"
VENT SIDES FRONT BACK
Top clearance for horizontal configuration - 1"
INSTALLATIONPOSITIONS
An upflow furnace may be installed in an upright position or
horizontal on either the left or right side panel. Do not install
this furnaceon itsback. Forvertically installed upflowfurnaces,
return air ductwork may be attached to the side panel(s) and/
or basepan. For horizontally installed upflow furnaces, return
airductwork mustbeattachedto thebasepan.Forcounterflow
furnaces, return ductwork must be attached to the top end of
theblower compartment.
NOTE: Ductwork must never be attached to the back of the
furnace.
• Ifthe furnace is usedinconnectionwith a cooling unit,
install the furnace upstream or in parallel with the
cooling unit coil. Premature heat exchanger failure
willresultifthecoolingunitcoilisplacedaheadofthe
furnace.
For vertical (upflow or downflow) applications, the
minimum cooling coil width shall not be less than
furnace width minus 1”. Additionally, a coil installed
aboveanupflowfurnaceorunderacounterflowfurnace
may be the same width as the furnace or may be one
sizelarger than the furnace. Example:a“C” width coil
may be installed with a “B” width furnace.
Forupflowapplications, thefrontofthecoilandfurnace
must face the same direction.
• If the furnace is installed in a residential garage,
position the furnace so that the burners and ignition
source are located not less than 18 inches (457 mm)
above the floor. Protect the furnace from physical
damageby vehicles.
• If the furnace is installed horizontally, the furnace
access doors must be vertical so that the burners fire
horizontally into the heat exchanger. Do not install
theunitwiththe accessdoors onthe“up/top”or“down/
bottom”sideofthefurnace.
• Do not connect this furnace to a chimney flue that
serves a separate appliance designed to burn solid
fuel.
• For counterflow installations, the air conditioning coil
must be downstream from the heat exchanger of the
furnace.
•Counterflowinstallationoveranoncombustiblefloor.
Before setting the furnace over the plenum opening,
ensurethesurface around the opening is smooth and
level.Atightseal shouldbemade betweenthefurnace
base and floor by using a silicon rubber caulking
compoundorcement grout.
• Counterflow installation over a combustible floor. If
installation over a combustible floor becomes
necessary, use an accessory subbase (see
SpecificationSheetapplicabletoyourmodelfordetails).
Aspecial accessorysubbasemustbe usedforupright
counterflow unit installations over any combustible
material including wood. Follow the instructions with
thesubbaseforproperinstallations.Donotinstallthe
furnacedirectly oncarpeting,tile, orothercombustible
materialotherthanwoodflooring.(NOTE:Thesubbase
willnot berequiredif anairconditioning coilisinstalled
betweenthe supplyairopening onthefurnace andthe
floor.

10
HORIZONTALINSTALLATION
For
horizontal installations,
insert the
#8 x 5/8 screw
from the
literature package.
Line contact to framing is permitted when installed in the hori-
zontal configuration. Line contact is defined as the portion of
the cabinet that is formed by the intersection of the top and
side. ACCESSIBILITY CLEARANCE, WHERE GREATER,
SHOULDTAKE PRECEDENCEOVERMINIMUM FIREPRO-
TECTIONCLEARANCE. Agas-fired furnace forinstallationin
aresidentialgaragemustbeinstalled sothat theignition source
and burners are located not less than eighteen inches (18")
abovethefloorandisprotectedor located to prevent physical
damage by vehicles. A gas furnace must not be installed di-
rectly on carpeting, tile, or other combustible materials other
thanwood flooring.
FURNACESUSPENSION
Ifsuspendingthefurnacefromraftersorjoist,use3/8" threaded
rod and 2”x2”x3/8” angle iron as shown below. The length of
rod will depend on the application and the clearances neces-
sary.
Suspended Furnace
EXISTING FURNACEREMOVAL
NOTE: When an existing furnace is removed from a venting
system serving other appliances, the venting system may be
toolargetoproperly vent the remaining attached appliances.
The following vent testing procedure is reproduced from the
American National Standard/National Standard of Canada
for Gas-Fired Central Furnaces ANSI Z21.47-Latest Edi-
tion, CSA-2.3-Latest Edition Section 1.23.1. The following
steps shall be followed with each appliance connected to the
ventingsystem placedinoperation, while anyotherappliances
connected to the venting system are not in operation:
a. Seal any unused openings in the venting system;
b. Inspect the venting system for proper size and
horizontalpitch,as required by the National Fuel Gas
Code,ANSIZ223.1or the CAN/CSAB149 Installation
Codesandthese instructions. Determine that thereis
noblockageorrestriction,leakage,corrosionandother
deficiencieswhichcouldcauseanunsafecondition;
c. In so far as practical, close all building doors and
windows and all doors between the space in which
theappliance(s)connectedto the venting system are
located and other spaces of the building. Turn on
clothes dryers and any appliance not connected to
the venting system. Turn on any exhaust fans, such
asrange hoods and bathroomexhausts,so they shall
operateatmaximumspeed. Donotoperateasummer
exhaustfan.Close fireplace dampers;
d. Follow the lighting instructions. Place the appliance
being inspected in operation. Adjust thermostat so
applianceshalloperatecontinuously;
e. Testfor drafthood equipped appliance spillage at the
drafthoodreliefopeningafter 5minutesofmainburner
operation. Use the flame of a match or candle;
f. After it has been determined that each appliance
connectedtothe venting system properly ventswhen
tested as outlined above, return doors, windows,
exhaust fans, fireplace dampers and any other gas
burningapplianceto their previous conditions of use;
g. Ifimproperventingisobserved duringanyoftheabove
tests,the common ventingsystemmustbe corrected.
Corrections must be in accordance with the latest edition of
theNationalFuelGasCodeNFPA54/ANSIZ223.1and/orCAN/
CSAB149Installation Codes.
Ifresizing is required onanyportionof the venting system,use
the appropriate table inAppendix G in the latest edition of the
National Fuel Gas CodeANSI Z223.1 and/or CAN/CSAB149
InstallationCodes.
THERMOSTATLOCATION
In an area having good air circulation, locate the thermostat
aboutfive feethigh onavibration-freeinsidewall. Do notinstall
thethermostat where it maybeinfluencedby any of thefollow-
ing:
• Drafts,ordeadspotsbehinddoors,incorners,orunder
cabinets.
• Hot or cold air from registers.