Goodman GMH95 User manual

CUS
®
RT6612018Rev.5
April2010
GMH95
40" 95% Gas Furnace
•RefertoServiceManualRS6610004forinstallation,operation,andtroubleshootinginformation.
•Allsafetyinformation must be followedasprovided in the ServiceManual.
•RefertotheappropriatePartsCatalog for part number information.
•Modelnumbers listed on page 3.
Copyright © 2007, 2009-2010 Goodman Manufacturing Company, L.P.
TECHNICAL MANUTECHNICAL MANU
TECHNICAL MANUTECHNICAL MANU
TECHNICAL MANUALAL
ALAL
AL
This manual is to be used by qualified, professionally trained HVAC technicians only.
Goodman does not assume any responsibility for property damage or personal
injury due to improper service procedures or services performed by an unqualified
person.

PRODUCT IDENTIFICATION
2
Minior
Revision
A
3
Description
Air Flow Direction
KBTUH
AFUE
Major Revision
Maximum CFM @ 0.5" ESP
3: 1200
4: 1600
5: 2000
Cabinet Width
The model and manufacturing number are used for positive identification of component parts used in manufacturing.
Pleaseusethese numbers when requesting serviceorparts information.
045: 45,000
070: 70,000
090: 90,000
115: 115,000
140: 140,000
Brand:
9: 90%
95:95%
G:Goodman
H:Dual$aver,MultiSpeed
V:TwoStage/VariableSpeed N:NaturalGas
X:LowNOx
NOx
A:InitialRelease
A: 14"
B: 17 1/2"
C: 21"
D: 24 1/2"
GMH95 045 XAA
A:Revision
M:Upflow/Horizontal
D:DedicatedDownflow
C:Downflow/Horizontal
H: Hi Air Flow
WARNING
WARNING 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.
Installation and repair of this unit
should be performed ONLY by
individuals meeting the require-
ments of an "entry level technician", at a minimum, as
specifiedbytheAir-Conditioning,Heating,andRefrigera-
tion Institute (AHRI). Attempting to install or repair this
unit without such background may result in product
damage, personal injury or death.
Goodman will not be responsible
for any injury or property damage
arising from improper service or service procedures. If
you install or perform service on this unit, you assume
responsibility for any personal injury or property damage
which may result. Many jurisdictions require a license to
install or service heating and air conditioning equipment.
WARNING
WARNING WARNING
WARNING

PRODUCT IDENTIFICATION
3
GMH950453BXA*
GMH950703BXA*
GMH950704CXA*
GMH950904CXA*
GMH950905DXA*
GMH951155DXA*
The model and manufacturing number are used for positive identification of component parts used in manufacturing.
Pleaseusethese numbers when requesting serviceorparts information.
The United States Environmental Protection Agency (“EPA”) has issued various regulations re-
garding the introduction and disposal of refrigerants introduced into this unit. Failure to follow
these regulations may harm the environment and can lead to the imposition of substantial fines.
These regulations may vary by jurisdiction. Should questions arise, contact your local EPA office.
WARNING
WARNING
Do not connect or use any device
that is not design certified by
Goodman for use with this unit.
Serious property damage, personal injury, reduced unit
performance and/or hazardous conditions may result
from the use of such non-approved devices.
WARNING
WARNING To prevent the risk of property
damage, personal injury, or death,
do not store combustible materials or use gasoline or
other flammable liquids or vapors in the vicinity of this
appliance.
WARNING
WARNING

4
PRODUCT DESIGN 3. Conversionkits for high altitude natural or propane gas
operation are available. See High Altitude Derate chart
fordetails.
4. Installer must supply the following gas line fittings, de-
pendingon which entrance isused:
Left -- Two 90º Elbows, one close nipple, straight pipe.
Right --Straightpipe to reach gasvalve.
Accessibility Clearances (Minimum)
POSITION* FRONT SIDES REAR TOP FLUE FLOOR
Upflow30010C
Horizontal 3 6 0 6 0 C
*= All positioning is determined as installed unit is viewed from the front.
C= If placed on combustible floor, floor MUST be wood only.
MINIMUM CLEARANCES TO COMBUSTIBLE MATERIALS
(INCHES)
NC= For instalaltion on non-combustible floors only. A non-combustible
subbase must be used for installations on combustible flooring.
24"atfront is required forservicing or cleaning.
Note: Inall cases accessibility clearanceshall take prece-
denceoverclearances fromtheenclosurewhereaccessibil-
ityclearancesaregreater. Alldimensionsaregivenininches.
High Altitude Derate
Whenthis furnace is installedat high altitude, theappropri-
ate High Altitude orifice kit must be installed. This is re-
quiredduetothenatural reduction in the density of boththe
gas fuel and combustion air as altitude increases. The kit
will provide the proper design certified input rate within the
specifiedaltituderange.
MODEL
NUMBER 0 to 7,000 ft. 7,001 to 9,000 ft. 9,001 to 11,000 ft. 7,001 to 11,000 ft.
GMH95*****XA*
LPM-051
LPM-062
Propane
Conversion Kit
(#55 Orifices)
HANG11
High Altitude
NaturalGas Kit
(#44 Orifices)
HANG12
High Altitude
NaturalGas Kit
(#45 Orifices)
HALP 10
High Altitude
LP Gas Kit
(#56 Orifices)
PROPANE AND HIGH ALTITUDE KITS
1LPM-05* supports White-Rodgers 2-stage valves only
2LPM-06* supports Honeywell and White-Rodgers 2-stage valves
High altitude kits are purchased according to the installa-
tionaltitudeandusageofeithernaturalorpropanegas.Refer
tothechartaboveforatabular listing of appropriate altitude
rangesandcorrespondingmanufacturer’shighaltitudeNatu-
ralGasandPropaneGaskits.For a tabular listing of appro-
priatealtituderangesandcorrespondingmanufacturer'sHigh
Altitude Pressure Switch kits, refer to either the Pressure
Switch Trip Points & Usage Chart in this manual or the Ac-
cessoryCharts in Service Instructions.
GeneralOperation
The GMH95 furnaces are equipped with an electronic igni-
tion device used to light the burners and an induced draft
blowerto exhaust combustion products.
Aninterlockswitchprevents furnace operation if theblower
door is not in place. Keep the blower access door in place
exceptforinspection and maintenance.
This furnace is also equipped with a self-diagnosing elec-
tronic control module. In the event a furnace component is
notoperatingproperly,the control module LED will flash on
and off in a factory-programmed sequence, depending on
theproblemencountered. This light canbeviewed through
theobservationwindowin the blower access door.Referto
theTroubleshootingChartforfurtherexplanationof the LED
codesandAbnormalOperation-IntegratedIgnitionControl
section in the Service Instructions for an explanation of the
possibleproblem.
Theratedheatingcapacityof the furnace should be greater
thanor equal to thetotal heat lossof the area tobe heated.
The total heat loss should be calculated by an approved
methodorinaccordance with “ASHRAE Guide” or “Manual
J-LoadCalculations”publishedby the Air ConditioningCon-
tractors of America.
*Obtain from: American National Standards Institute 1430
BroadwayNewYork,NY10018
LocationConsiderations
• The furnace should be as centralized as is practical
with respect to the air distribution system.
• Donotinstallthefurnacedirectly on carpeting, tile, or
combustiblematerialotherthanwood flooring.
• When suspending the furnace from rafters or joists,
use 3/8" threaded rod and 2” x 2” x 3/8” angle as
showninthe InstallationandServiceInstructions. The
length of the rod will depend on the application and
clearancenecessary.
• When installed in a residential garage, the furnace
mustbepositionedso the burners and ignitionsource
are located not less than 18 inches (457 mm) above
the floor and protected from physical damage by ve-
hicles.
Notes:
1. Installermustsupplyone ortwoPVCpipes:one forcom-
bustionair(optional)andonefortheflueoutlet(required).
Ventpipemustbeeither2”or3” in diameter, depending
uponfurnaceinput,numberofelbows,lengthofrunand
installation (1 or 2 pipes). The optional Combustion Air
Pipeisdependent oninstallation/coderequirementsand
must be 2” or 3” diameter PVC.
2. Linevoltagewiringcanenter through therightorleftside
ofthefurnace.Lowvoltage wiring can enter through the
rightor left side offurnace.

5
COMPONENT IDENTIFICATION
Upflow/Horizontal
1 GasValve
2 GasLineEntrance(Alternate)
3 PressureSwitch
4 GasManifold
5 CombustionAirIntakeConnection/ “Coupling”
6 HotSurfaceIgniter
7 RolloutLimit
8 Burners
9 FlameSensor
10 FluePipeConnection/“Coupling”
11 FluePipe(Internal)
12 Primary Limit
13 Gas LineEntrance
14 FluePipeConnection(Alternate)
15 RubberElbow
16 InducedDraftBlower
17 Electrical ConnectionInlets(Alternate)
18 CoilFrontCoverPressureTap
19 CoilFrontCoverDrainPort
20 DrainLinePenetrations
21 DrainTrap
22 Blower DoorInterlockSwitch
23 Capacitor
24 IntegratedControlModule
(withfuseand diagnostic LED)
25 24-VoltThermostatConnections
26 Transformer(40VA)
27 CirculatorBlower
28 Auxiliary Limit
29 Junction Box
30 Electrical ConnectionInlets
31 CoilFrontCover

COMPONENT IDENTIFICATION
6
GMH95*****XA*
Cabinet Size A B C D E
13-5/8
17-1/2
20-7/8
All dimensions are in inches.
24-1/2
12-1/8
16
19-3/8
12-15/16
15-15/16
20-7/16
GMH950453BXA*
GMH950703BXA*
GMH950704CXA*
GMH950904CXA*
GMH950905DXA*
GMH951155DXA*
16
19-1/2
23
17-1/2
21
RIGHT SIDE
DRAIN LINE
HOLES
AIR
INTAKE
PIPE
2" PVC
1 5/8
RIGHT SIDE VIEW
2
1 1/2
UNFOLDED FLANGES
1
FOLDED FLANGES
UNFOLDED FLANGES
FOLDED FLANGES
A
IR
DISCHARGE
AIR
DISCHARGE
Note: Airflow area will be reduced by approximately 18% if duct flanges are not unfolded. This could cause performance issues and
noise issues.

7
PRODUCT DESIGN
TRIP POINT
COIL COVER
PRESSURE
SWITCH
COIL COVER
PRESSURE
SWITCH
PART #
TRIP POINT
ID BLOWER
PRESSURE
SWITCH
ID BLOWER
PRESSURE
SWITCH
PART #
TRIP POINT
COIL COVER
PRESSURE
SWITCH
TRIP POINT
ID BLOWER
PRESSURE
SWITCH
HIGH
ALTITUDE KIT
GMH950453BXA* -1.30 -1.10 -0.52 -0.37 -0.37 20197312 -1.10 0130F00000P TBD TBD TBD
GMH950703BXA* -1.10 -0.95 -0.52 -0.37 -0.37 20197312 -0.95 0130F00002P TBD TBD TBD
GMH950704CXA* -1.30 -1.10 -0.52 -0.37 -0.37 20197312 -1.10 0130F00000P TBD TBD TBD
GMH950904CXA* -1.40 -1.20 -0.75 -0.60 -0.60 20197310 -1.20 0130F00001P TBD TBD TBD
GMH950905DXA* -1.30 -1.10 -0.52 -0.37 -0.37 20197312 -1.10 0130F00000P TBD TBD TBD
GMH951155DXA* -1.30 -1.10 -0.75 -0.60 -0.60 20197310 -1.10 0130F00000P TBD TBD TBD
NEGATIVE
PRESSURE
ID BLOWER
WITH FLUE
FIRING
TYPICAL
SEA
LEVE
DATA(2)
NEGATIVE
PRESSURE
COIL COVER
WITH FLUE
FIRING
TYPICAL
SEA
LEVE
DATA(2)
NEGATIVE
PRESSURE
COIL COVER
WITH FLUE
NOT FIRING
TYPICAL
SEA
LEVEL
DATA(1)
(2) Data given is the least negative pressure required for pressure switch to remain closed.
PRESSURE SWITCH TRIP POINTS AND USAGE CHART
(1) Data given is least negative pressure required for pressure switch to close.
MODEL
0 to 7,000 ft.
PRESSURE SWITCH TRIP POINTS AND USAGE
7,001 to 11,000 ft.
NEGATIVE
PRESSURE
ID BLOWER
WITH FLUE
NOT FIRING
TYPICAL
SEA
LEVEL
DATA(1)
Part Number 20162903 20162904
Open Setting (°F) 160 150
GMH950453BXA* 1
GMH950703BXA* 1
GMH950704CXA* 1
GMH950904CXA* 1
GMH950905DXA* 1
GMH951155DXA* 1
T.O.D. PRIMARY LIMIT

8
PRODUCT DESIGN
Part Number 10123514 or 10123533
Open Setting (°F) 200
GMH950453BXA* 1
GMH950703BXA* 2
GMH950704CXA* 2
GMH950904CXA* 2
GMH950905DXA* 2
GMH951155DXA* 2
ROLLOUT LIMIT SWITCHES
Part Number 10123535 10123519
Open Setting (°F) 150 160
GMH950453BXA* 1
GMH950703BXA* 1
GMH950704CXA* 1
GMH950904CXA* 1
GMH950905DXA* 1
GMH951155DXA* 1
AUXILIARY LIMIT SWITCHES

9
PRODUCT DESIGN
Coil Matches:
Alargearray of Amana®brandcoilsareavailable for use with theGMH95 furnaces, in either upflowor horizontal applica-
tions. These coils are available in both cased and uncased models (with the option of a field installed TXV expansion
device). These 95%+ furnaces match up with the existing Amana®brand coils as shown in the chart below.
Coil Matches (for Goodman®units using R22 and R-410A):
• All CAPF coils in B, C, & D widths have insulated blank off plates for use with one size smaller furnaces.
• All CAPF coils have a CAUF equivalent.
• All CHPF coils in B, C & D heights have an insulated Z bracket for use with one size smaller furnace.
• All proper coil combinations are subject to being ARI rated with a matched outdoor unit.
C A P F 1824 A 6 A
PRODUCT
TYPE:
C: Indoor Coil
CABINET FINISH:
U:Unpainted
P:Painted
N:Unpainted Case
EXPANSION
DEVICE:
F: Flowrate
r
NOMINAL CAPACITY RANGE
@ 13 SEER
1824: 1 1/2 to 2 Tons
3030: 2 1/2 Tons
3636: 3 Tons
3642: 3 to 3 1/2 Tons
3743: 3 to 3 1/2 Tons
4860: 4 &5 Tons
4961: 4 &5 Tons
REVISION
A: Revision
NOMINALWIDTH FOR GAS FURNACE
A:Fits 14" Furnace Cabinet
B: Fits 17 1/2" Furnace Cabinet
C: Fits 21" Furnace Cabinet
D: Fits 24 1/2" Furnace Cabinet
N: Does Not Apply (Horizontal SlabCoils)
APPLICATION
A: Upflow/DownflowCoil
H: Horizontal A Coil
S: Horizontal Slab Coil
REFRIGERANT
CHARGE:
6: R-410A or R-22
2: R-22
4: R-410a

10
PRODUCT DESIGN
Filters:
Filters are required with this furnace and must be provided by the installer. The filters used must comply with UL900 or
CAN/ULCS111standards.Installing this furnace withoutfilterswill void the unitwarranty.
This furnace has provisions for the installation of return air filters at the side and/or bottom return. The furnace will
accommodatethe following filter sizes depending on cabinet size:
RefertoMinimumFilterAreatablestodeterminefilterarearequirement.NOTE:Filterscanalsobeinstalledelsewherein
the duct system such as a central return.
Upflow Filters
Disposable Minimum Filter Area (in2)
[Based on a 300 ft/min filter face velocity]
*Minimum filter area dictated by heating airflow requirement. Permanent Minimum Filter Area (in2)
[Based on 600 ft/min filter face velocity]
*Minimum filter area dictated by heating airflow requirement.
600 800 1000 1200 1400 1600 2000
0453BXA* 194* 194* 240 288 --- --- ---
0703BXA* --- 324* 324* 324* 336 --- ---
0704CXA* --- --- 291* 291* 336 384 ---
0904CXA* --- --- 432* 432* 432* 432* ---
0905DXA* --- --- --- 388* 388* 388* 480
1155DXA* --- --- --- 486* 486* 486* 486*
Input__Airflow
COOLING AIRFLOW REQUIREMENT (CFM)
600 800 1000 1200 1400 1600 2000
0453BXA* 388* 388* 480 576 --- --- ---
0703BXA* --- 647* 647* 647* 672 --- ---
0704CXA* --- --- 583* 583* 672 768 ---
0904CXA* --- --- 863* 863* 863* 863* ---
0905DXA* --- --- --- 777* 777* 777* 960
1155DXA* --- --- --- 971* 971* 971* 971*
COOLING AIRFLOW REQUIREMENT (CFM)
Input__Airflow
Cabinet
Width
(in.)
Nominal
Filter Size
(in.)
Approx.
Flow Area
(
in2
)
Cabinet
Width
(in.)
Nominal
Filter Size
(in.)
Approx.
Flow Area
(
in2
)
All 16 x 25 x 1 400 17-1/2 14 x 25 x 1 350
21 16 x 25 x 1 400
24-1/2 20 x 25 x 1 500
BOTTOM RETURN (1)
SIDE RETURN
(1) Flanges on bottom return must be unfolded
Thermostats:
NOTE: Complete lineup of thermostats can be found in the Thermostat Specification Sheets.

FURNACE SPECIFICATIONS
11
1. These furnaces are manufactured for natural gas operation. Optional kits are available for conversion to propane operation.
2. For elevations above 2000 feet the rating should be reduced by 4% for each 1000 feet above sea level. The furnace must not be derated, orifice changes should only
be made if necessary for altitude.
3. The total heat loss from the structure as expressed in TOTAL BTU/HR must be calculated by the manufacturers method or in accordance with the "A.S.H.R.A.E.
GUIDE" or "MANUAL J-LOAD CALCULATIONS" published bythe AIR CONDITIONING CONTRACTORS OF AMERICA.The total heat loss calculated should beequal
to or less than the heating capacity. Output based on D.O.E. test procedures.
4. Minimum Circuit Ampacity calculated as: (1.25 x Circulator Blower Amps) + I.D. Blower Amps.
Unit specifications are subject to change without notice. ALWAYS refer to the units serial plate for the most up-to-date general and electrical information.
(1) Wire size should be determined in accordance with National Electrical Codes. Extensive wire runs will require larger wire sizes.
(2) Maximum Overcurrent Protection Device: May use Time Delay Fuse or HACR type Circuit Breaker of the same size as noted.
(3) Off Heating - this fan delay timing is adjustable (100 and 150 seconds). Furnaces are shipped with 150 second off delay.
(4) See Installation Instructions for appropriate vent diameter, length and number of elbows.
(5) See Installation Instructions for appropriate combustion air pipe diameter, length and number of elbows.
NOTE: This data is provided as a guide, it is important to electrically connect the unit and properly size fuses/circuit breakers and wires in
accordance with all national and/or local electrical codes. Use copper wire only.
GMH95
MODEL GMH95
0453BXA* GMH95 0703BXA* GMH95 0704CXA* GMH95 0904CXA* GMH95 0905DXA* GMH95 1155DXA*
Btuh
Input (US) 46,000 69,000 69,000 92,000 92,000 115,000
Output (US) 44,400 66,400 66,900 89,000 88,400 110,500
Input (CAN) 46,000 69,000 69,000 92,000 92,000 115,000
Output (CAN) 44,400 66,400 66,900 89,000 89,400 110,500
A.F.U.E. 95.0% 95.0% 95.0% 95.0% 95.0% 95.0%
Rated External Static (" w.c.) .20 - .50 .20 - .50 .20 - .50 .20 - .50 .20 - .50 .20 - .50
Temperature Rise (°F) 35 - 65 30 - 60 35 - 65 30 - 60 35 - 65 35 - 65
ID Blower Pressure Switch Trip Point (" w.c.) -1.10 -0.95 -1.10 -1.20 -1.10 -1.10
Front Cover Pressure Switch Trip Point (" w.c.) -0.37 -0.37 -0.37 -0.60 -0.37 -0.60
Blower Wheel (D" x W") 10 x 8 10 x 8 10 x 10 10 x 10 11 x 10 11 x 10
Blower Horsepower 1/3 1/3 1/2 1/2 3/4 3/4
Blower Speeds 4 4 4 4 4 4
Max CFM @ 0.5 E.S.P. 1200 1200 1600 1600 2000 2000
Power Supply 115-60-1 115-60-1 115-60-1 115-60-1 115-60-1 115-60-1
Minimum Circuit Ampacity (MCA)(1) 9.4 9.4 13.8 13.8 13.2 13.2
Maximum Overcurrent Device(2) 15.0 15.0 15.0 15.0 15.0 15.0
Transformer (VA) 40 40 40 40 40 40
Primary Limit Setting (°F) 150 160 160 150 160 160
Auxiliary Limit Setting (°F) 150 150 150 150 150 160
Rollout Limit Setting (°F) 200 200 200 200 200 200
Fan Delay On Heating 30 secs. 30 secs. 30 secs. 30 secs. 30 secs. 30 secs.
Off Heating (3) 150 secs. 150 secs. 150 secs. 150 secs. 150 secs. 150 secs.
Fan Delay On Cooling 6 sec. 6 sec. 6 sec. 6 sec. 6 sec. 6 sec.
Off Cooling 45 secs. 45 secs. 45 secs. 45 secs. 45 secs. 45 secs.
Gas Supply Pressure (Natural/Propane) ("w.c.) 7 / 11 7 / 11 7 / 11 7 / 11 7 / 11 7 / 11
Manifold Pressure (Natural/Propane) ("w.c.) 3.5 / 10 3.5 / 10 3.5 / 10 3.5 / 10 3.5 / 10 3.5 / 10
Orifice Size (Natural/Propane) 43 / 55 43 / 55 43 / 55 43 / 55 43 / 55 43 / 55
Number of Burners 2 3 3 4 4 5
Vent Connector Diameter (inches)(4) 222222
Combustion Air Connector Diameter (inches)(5) 222222
Shipping Weight (lbs.) 132 135 136 158 172 175

BLOWER PERFORMANCE SPECIFICATIONS
12
1. CFM in chart is without filters(s). Filters do not ship with this furnace, but must be provided by the installer. If the furnace requires two return
filters, this chart assumes both filters are installed.
2. All furnaces ship as high speed cooling and medium-speed heating. Installer must adjust blower cooling & heating speed as needed.
3. For most jobs, about 400 CFM per ton when cooling is desirable.
4. INSTALLATIONISTOBEADJUSTEDTOOBTAINTEMPERATURERISEWITHINTHERANGESPECIFIEDON THERATINGPLATE.
5. The chart is for information only. For satisfactory operation, external static pressure must not exceed value shown on rating plate. The shaded
area indicates ranges in excess of maximum external static pressure allowed when heating. The data for 0.6" w.c. to 0.8" w.c. is shown for
air conditioning purposes only.
6. The above chart is for U.S. furnaces installed at 0-2000 feet. At higher altitudes, a properly de-rated unit will have approximately the same
temperature rise at a particular CFM, while the ESP at that CFM will be lower.
Tons AC
at 0.5" 0.6 0.7 0.8
ESP CFM RISE CFM RISE CFM RISE CFM RISE CFM RISE CFM CFM CFM
HIGH 3.0 1352 29 1318 30 1260 31 1202 33 1128 35 1044 955 853
GMH950453BXA* MED 2.5 1214 32 1172 34 1123 35 1064 37 1012 39 938 859 741
(MED-HI) MED-LO 2.0 997 40 994 40 960 41 923 43 884 45 817 741 611
LOW 1.5 757 52 753 52 734 54 704 56 674 59 620 524 438
HIGH 3.0 1449 41 1409 42 1326 45 1273 47 1201 49 1194 1136 1018
GMH950703BXA* MED 2.5 1192 50 1172 51 1141 52 1094 54 1046 57 973 904 793
(MED-HI) MED-LO 2.0 981 61 962 62 943 63 917 65 888 67 830 764 665
LOW 1.5 750 79 730 81 714 83 692 86 657 90 620 570 502
HIGH 4.0 2069 29 1965 30 1871 32 1756 34 1661 36 1549 1415 1275
GMH950704CXA* MED 3.5 1752 34 1724 34 1667 36 1603 37 1488 40 1402 1290 1082
(MED-HI) MED-LO 3.0 1437 41 1437 41 1417 42 1369 43 1320 45 1256 1140 984
LOW 2.5 1184 50 1177 50 1161 51 1132 52 1095 54 1047 928 837
HIGH 4.0 1970 40 1874 342 1757 45 1667 48 1566 51 1431 1334 1182
GMH950904CXA* MED 3.5 1713 46 1650 48 1572 50 1510 52 1418 56 1313 1211 1079
(MED-HI) MED-LO 3.0 1439 55 1412 56 1370 58 1327 60 1260 63 1166 1078 956
LOW 2.5 1183 67 1155 69 1122 74 1108 72 1062 75 1011 931 816
HIGH 5.0 2147 37 2114 37 2057 39 2030 39 1978 40 1889 1784 1713
GMH950905DXA* MED 4.0 1675 47 1686 47 1640 48 1623 49 1557 51 1501 1455 1360
(MED-HI) MED-LO 3.5 1489 53 1470 54 1436 55 1409 56 1361 58 1318 1243 1130
LOW 3.0 1307 61 1265 63 1234 64 1203 66 1168 68 1096 1053 991
HIGH 5.0 2134 46 2103 47 2029 48 1941 51 1906 51 1818 1733 1625
GMH951155DXA* MED 4.0 1678 58 1643 60 1643 60 1577 62 1527 64 1489 1423 1339
(MED-HI) MED-LO 3.5 1453 68 1440 68 1426 69 1363 72 1349 73 1314 1253 1205
LOW 3.0 1259 78 1239 79 1220 80 1181 83 1159 85 1118 1082 1015
BLOWER PERFORMANCE
0.1 0.2 0.3 0.4 0.5
(CFM & Temperature Rise vs. External Static Pressure)
Model
Heating Speed
As Shipped
Motor
Speed
EXTERNAL STATIC PRESSURE (Inches Water Column)
()

BLOWER PERFORMANCE SPECIFICATIONS
13
30 40 50 60 70 80 90 110 120
100 130 140 150
100
90 80
70 60 50
40 30 20
10
OUTPUT BTU/HR x 1000
BTU OUTPUT vs TEMPERATURE RISE CHART
TEMPERATURE RISE
600 CFM
700
900
1000
1100
1200
1400
1600
1800
2000
2200
2400 CFM
FORMULAS
BTU OUTPUT = CFM x 1.08 x RISE
RISE = BTU OUTPUT
1.08 ÷ CFM
800

14
WIRING DIAGRAMS
Wiring is subject to change, always refer to the wiring diagram on the unit for the most up-to-date wiring.
GMH95[0453,0704,0905]*XAB
GMH95[0703,0904,1155]*XAC
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.
R
YL YELLOW
OR
ORANGE
PU
PURPLE
GN
GREEN
BK
BLACK
BR
BROWN
WH
WHITE
BL
BLUE
GY
GRAY
RD
RED
COLOR
CODES:
LOW
VOLTAGE (24V)
LOW
VOLTAGE FIELD
HI
VOLTAGE (115V)
HI
VOLTAGE FIELD
NOTES:
1.
SET HEAT ANTICIPATOR ON ROOM THERMOSTAT AT 0.7 AMPS.
2.
MANUFACTURER'S SPECIFIED
REPLACEMENT
PARTS MUST BE USED WHEN SERVICING.
0140F00592 REV. A
OR (MED LOW)
BL (MED)
RD (LOW)
GAS
VALVE
C
PM
CGW
INTERNAL TO
INTEGRATED
CONTROL
JUNCTION
EQUIPMENTGND
FIELDGND
DIAGNOSTIC
LED
2 CIRCUIT
CONNECTOR
HOT
SURFACE
IGNITER
OVERCURRENT
PROT.
DEVICE
IGNITER
TH (3)
INTEGRATED
CONTROLMODULE
JUNCTION
BOX
LINE-H
XFMR-H
INTEGRATED CONTROL MODULE
INTEGRATED CONTROL MODULE
GND
DISCONNECT
LN
OVERCURRENT PROTECTION DEVICE
BR
GY
RD
BL
BK
4. IF HEATING AND COOLING BLOWER SPEEDS ARE NOT THE SAME, DISCARD JUMPER BEFORE CONNECTING BLOWER LEADS.UNUSED
BLOWER LEADS
MUST
BE PLACED ON "PARK" TERMINALS OF INTEGRATED CONTROL OR TAPED.
3.
IF ANY OF THE ORIGINAL WIRE AS SUPPLIED WITH THE FURNACE MUST BE REPLACED, IT MUST BE REPLACED WITH WIRINGMATERIAL
HAVING
A TEMPERATURE RATING OF AT LEAST 105
TERMINALSWITCH
(PRESS.)
5. UNIT MUST BE PERMANENTLY GROUNDED AND CONFORM TO N.E.C. AND LOCAL CODES.
PK PINK
115 VAC HOT AND PARK TERMINALS
LINE-H
FLAME
SENSOR
FRONT
COVER
PRESSURE
SWITCH
N
O
C
GY
BK
PLUG
CONNECTION
FIELD
SPLICE
SWITCH
(TEMP.)
OR
24VTHERMOSTAT
CONNECTIONS
GR
GND
115VAC
24VAC
BLOWER
COMPARTMENT
DOORSWITCH
(OPENWHEN
DOOROPEN)
DOOR
SWITCH
BK
GND
L
N
WH
JUNCTION
BOX
1
OR
ID
BLOWER
PRESSURE
SWITCH
HEAT-H
GNDWH
RD
WH
GND
BURNER
COMPARTMENT
BLOWER
COMPARTMENT
NOTE
4
SEE
N
O
COOL-H
BK (HI)
BRBR
CAPACITOR
YL
WH
YL
BL
PU
RD
OR
PK
BK
WHWH
BLOWER
INDUCED
DRAFT
MANUAL RESET
AUXILIARY
LIMITS
(1)
IN UPFLOW
BLOWER DECK
(2)
IN C'FLOW
BLOWER HOUSING
C
FS
HI
HEAT-H
LO
HEAT-H
IGNITER
HOT
SURFACE
IND
IGN
EAC-HAIR
CLEANER
ELECTRONIC
BLWR
CIRCULATOR
BLWR
ID
FLAME
SENSOR
115
VAC
TRANSFORMER
40
VA
24
VAC
GND
RO1 (5)
RO2
(11)
HLO
(1)
HLI
(7)
MVC(9)
GND(8)
TR(6)
OR
WH
WH
BL
YL OR
RD
GR BR
PK
PK
GY
WH
115 VAC NEUTRAL
BK
BK
GY
24V THERMOSTAT CONNECTIONS
MICRO
TO
C
G
Y
W
R
2
WH
OR
BL
YL
OR
ORGY
PK
RD
OR
GY
WH
XFMR-H
TERMINALS
GY
OR
GR
BR
1
2
3
121110
987
654
°C. USE COPPER CONDUCTORS ONLY.
24VAC
HUMIDIFIER
24
VAC
HUMIDIFIER
HUMIDIFIER
PSO (4)
MVL(2)
PS
(10)
C
NO
CNO
FRONTCOVER
PRESSURE
SWITCH
IDBLOWER
PRESSURE
SWITCH
0
C
7
6
5
4
3
2
1
OFF = CONTROL FAILURE
STEADY ON = NORMAL OPERATION
1 FLASH =
2 FLASHES = PRESSURE SWITCH STUCK CLOSED
3 FLASHES = PRESSURE SWITCH STUCK OPEN
4 FLASHES = OPEN HIGH LIMIT
5 FLASHES = FLAME SENSE WITHOUT GAS VALVE
7 FLASHES = LOW FLAME SIGNAL
6 FLASHES =
CONTINUOUS/RAPID FLASHES = REVERSED 115 VAC POLARITY
CONTROL
MODULE
INTEGRATED
FUSE
ON OFF
2ND
STAGE
DELAY
MODE
HEAT
OFF
DELAY
FS
1
2
3
HI
OR
OR
PM
GAS
VALVE
C
HI
MVH(12)
FACTORY SETTINGS
SHOWN
*
*
*
*
SEE
NOTE 6
COOL-H
TO 115VAC/ 1Ø
/60 HZ POWER SUPPLYWITH
PU
Y
6. TO RECALL THE LAST 5 FAULTS, MOST RECENT TO LEAST RECENT, DEPRESS SWITCH FOR MORETHAN 2 SECONDS WHILEIN
STANDBY
(NO THERMOSTAT INPUTS)
BK
LINE NEUTRALS
8
8 FLASHES = CHECK IGNITER OR IMPROPER GROUNDING

15
WIRING DIAGRAMS
Wiring is subject to change, always refer to the wiring diagram on the unit for the most up-to-date wiring.
GMH95[0453,0704,0905]*XAC
GMH95[0703,0904,1155]*XAD
R
YLYELLOW
OR ORANGE
PU PURPLE
GN GREEN
BK BLACK
BR BROWN
WH WHITE
BL BLUE
GY GRAY
RD RED
COLOR CODES:
LOW VOLTAGE (24V)
LOW VOLTAGE FIELD
HI VOLTAGE (115V)
HI VOLTAGE FIELD
NOTES:
1. SET HEAT ANTICIPATOR ON ROOM THERMOSTAT AT 0.7 AMPS.
2.MANUFACTURER'S SPECIFIED REPLACEMENTPARTS MUST BE USED WHEN SERVICING.
0140F00663 REV. A
OR (MED LOW)
BL (MED)
RD (LOW)
GAS VALVE (HONEY WELL)
C
PM
CG W
INTERNAL TO
INTEGRATED CONTROL
JUNCTION
EQUIPMENT GND
FIELD GND
DIAGNOSTIC
LED
2 CIRCUIT
CONNECTOR
HOT
SURFACE
IGNITER
OVERCURRENT
PROT. DEVICE
IGNITER
TH (3)
INTEGRATED
CONTROL MODULE
JUNCTION BOX
LINE-H
INTEGRATED CONTROLMODULE
GND
DISCONNECT
LN
DISCONNECTPOWER
BEFORE SERVICING.
WIRING TO UNIT
MUST BE
PROPERLY
POLARIZED
AND GROUNDED.
OVERCURRENTPROTECTION DEVICE
BR
GY
RD
BL
BK
4. IF HEATING AND COOLING BLOWER SPEEDSARE NOT THE SAME, DISCARD JUMPER BEFORE CONNECTING BLOWER LEADS. UNUSED
BLOWER LEADS MUSTBEPLACED ON "PARK"TERMINALS OF INTEGRATED CONTROLOR TAPED.
3.IF ANY OF THE ORIGINAL WIRE AS SUPPLIED WITH THE FURNACE MUSTBE REPLACED, ITMUST BE REPLACED WITH WIRING MATERIAL
HAVING A TEMPERATURE RATING OFAT LEAST 105
TERMINAL SWITCH (PRESS.)
5. UNIT MUST BE PERMANENTLY GROUNDED AND CONFORM TO N.E.C.AND LOCAL CODES.
PK PINK
115 VAC HOT AND PARK TERMINALS
LINE-H
FLAME
SENSOR
FRONT COVER
PRESSURE SWITCH
( SINGLE CONTROL ON 45K BTU )
N
O
C
GY
BK
PLUG CONNECTION
FIELD SPLICE
SWITCH (TEMP.)
OR
24V THERMOSTAT
CONNECTIONS
GR
GND
115 VAC
24 VAC
BLOWER
COMPARTMENT
DOOR SWITCH
(OPEN WHEN
DOOR OPEN)
DOOR
SWITCH
WARNING:DISCONNECT POWER BEFORE
SERVICING.WIRING TO UNIT MUST BE
PROPERLY POLARIZED AND GROUNDED.
BK
GND
DISCONNECT L
POWER SUPPLY WITH
OVERCURRENT PROTECTION DEVICE
WH
JUNCTION
BOX
OR
ID BLOWER
PRESSURE
SWITCH
HEAT-H
GND WH
RD
WH
GND
BURNER COMPARTMENT
BLOWER COMPARTMENT
NOTE 4
SEE
N
O
COOL-H
BK (HI)
BR BR
CAPACITOR
YL
WH
YL
CONTROL
PRIMARY LIMIT
AUTO RESET
BL
PU
MANUAL RESET ROLLOUT LIMIT CONTROL(S)
RD
OR
PK
BK
WH WH
BLOWER
INDUCED DRAFT
MANUAL RESET
AUXILIARY LIMITS
(1) IN UPFLOW
BLOWER DECK
(2) IN C'FLOW
BLOWER HOUSING
C
CIRCULATOR
BLOWER
FS
LIMIT CONTROLS
MANUAL RESET AUXILIARY
HI
HEAT-H
LO
HEAT-H
IGNITER
HOT SURFACE
IND
IGN
EAC-H AIR CLEANER
ELECTRONIC
BLWR
CIRCULATOR
BLWR
ID
FLAME SENSOR
115 VAC
TRANSFORMER
40 VA
24 VAC
GND
CONTROL
LIMIT
PRIMARY
AUTO RESET
(SINGLE CONTROL ON 45K BTU)
LIMIT CONTROL(S)
MANUAL RESET ROLLOUT
RO1 (5)
RO2 (11)
HLO (1)
HLI (7)
MVC (9)
GND (8)
BL
YL OR
RD
GR BR
PK
GY
BK
MICRO
TO
C
G
Y
W
R
TRANSFORMER
40 VA
2
WH
OR
BL
YL
OR
OR GY
PK
RD
OR
GY
XFMR-H
TERMINALS
GY
OR
GR
BR
1
2
3
12 11 10
98
7
65
WARNING:
C. USE COPPER CONDUCTORS ONLY.
24 VAC
HUMIDIFIER
24 VAC
HUMIDIFIER
HUMIDIFIER
PSO (4)
MVL(2)
PS (10)
C
NO
CNO
FRONT COVER
PRESSURE SWITCH
ID BLOWER
PRESSURE
SWITCH
0
C
7
6
5
4
3
2
1
OFF = CONTROL FAILURE
STEADY ON = NORMAL OPERATION
1 FLASH =
2 FLASHES = PRESSURE SWITCH STUCK CLOSED
3 FLASHES = PRESSURE SWITCH STUCK OPEN
4 FLASHES = OPEN HIGH LIMIT
5 FLASHES = FLAME SENSE WITHOUT GAS VALVE
OPEN ROLLOUT OR OPEN FUSE
7 FLASHES = LOW FLAME SIGNAL
6 FLASHES =
SYSTEM LOCKOUT (RETRIES EXCEEDED)
CONTINUOUS/RAPID FLASHES = REVERSED 115 VAC POLARITY
CONTROL
MODULE
INTEGRATED
FUSE
ON OFF
2ND
STAGE
DELAY
MODE
HEAT
OFF
DELAY
FS
1
3
2
HI
PM
GAS
VALVE
C
HI
MVH (12)
FACTORY SETTINGS
SHOWN
*
*
*
*
SEE
NOTE 6
COOL-H
TO 115VAC/ 1 Ø /60 HZ POWER SUPPLY WITH
PU
Y
6. TO RECALL THE LAST 5 FAULTS, MOST RECENT TO LEAST RECENT, DEPRESS SWITCH FOR MORE THAN 2 SECONDS WHILE IN
STANDBY (NO THERMOSTAT INPUTS)
8
GY
BK
WH
BK
TR (6)
XFMR-H
4
N
TO 115 V
A
C / 1Ø / 60HZ
1
PK
WH
WH WH
OR
8 FLASHES = CHECK IGNITER OR IMPROPER GROUNDING
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.