Goodman Mfg Furnace GMH95 User Manual

TECHNICAL MANUAL  
GMH95  
40" 95% Gas Furnace  
Refer to Service Manual RS6610004 for installation, operation, and troubleshooting information.  
All safety information must be followed as provided in the Service Manual.  
Refer to the appropriate Parts Catalog for part number information.  
Model numbers listed on page 3.  
®
US  
C
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.  
RT6612018Rev.5  
April 2010  
Copyright © 2007, 2009-2010 Goodman Manufacturing Company, L.P.  
 
PRODUCT IDENTIFICATION  
The model and manufacturing number are used for positive identification of component parts used in manufacturing.  
Please use these numbers when requesting service or parts information.  
GMH950453BXA*  
GMH950703BXA*  
GMH950704CXA*  
GMH950904CXA*  
GMH950905DXA*  
GMH951155DXA*  
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  
WARNING  
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.  
Do not connect or use any device  
To prevent the risk of property  
WARNING  
WARNING  
that is not design certified by  
Goodman for use with this unit.  
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.  
Serious property damage, personal injury, reduced unit  
performance and/or hazardous conditions may result  
from the use of such non-approved devices.  
3
 
PRODUCT DESIGN  
3. Conversion kits for high altitude natural or propane gas  
operation are available. See High Altitude Derate chart  
for details.  
General Operation  
The GMH95 furnaces are equipped with an electronic igni-  
tion device used to light the burners and an induced draft  
blower to exhaust combustion products.  
4. Installer must supply the following gas line fittings, de-  
pending on which entrance is used:  
An interlock switch prevents furnace operation if the blower  
door is not in place. Keep the blower access door in place  
except for inspection and maintenance.  
Left -- Two 90º Elbows, one close nipple, straight pipe.  
Right -- Straight pipe to reach gas valve.  
This furnace is also equipped with a self-diagnosing elec-  
tronic control module. In the event a furnace component is  
not operating properly, the control module LED will flash on  
and off in a factory-programmed sequence, depending on  
the problem encountered. This light can be viewed through  
the observation window in the blower access door. Refer to  
the Troubleshooting Chart for further explanation of the LED  
codes and Abnormal Operation - Integrated Ignition Control  
section in the Service Instructions for an explanation of the  
possible problem.  
Accessibility Clearances (Minimum)  
MINIMUM CLEARANCES TO COMBUSTIBLE MATERIALS  
(INCHES)  
POSITION* FRONT SIDES REAR  
TOP  
FLUE FLOOR  
Upflow  
3
3
0
6
0
0
1
6
0
0
C
C
Horizontal  
*= All positioning is determined as installed unit is viewed from the front.  
C= If placed on combustible floor, floor MUST be wood only.  
NC= For instalaltion on non-combustible floors only. A non-combustible  
subbase must be used for installations on combustible flooring.  
The rated heating capacity of the furnace should be greater  
than or equal to the total heat loss of the area to be heated.  
The total heat loss should be calculated by an approved  
method or in accordance with “ASHRAE Guide” or “Manual  
J-Load Calculations” published by the Air Conditioning Con-  
tractors of America.  
24" at front is required for servicing or cleaning.  
Note: In all cases accessibility clearance shall take prece-  
dence over clearances from the enclosure where accessibil-  
ity clearances are greater. All dimensions are given in inches.  
*Obtain from: American National Standards Institute 1430  
Broadway New York, NY 10018  
High Altitude Derate  
When this furnace is installed at high altitude, the appropri-  
ate High Altitude orifice kit must be installed. This is re-  
quired due to the natural reduction in the density of both the  
gas fuel and combustion air as altitude increases. The kit  
will provide the proper design certified input rate within the  
specified altitude range.  
Location Considerations  
The furnace should be as centralized as is practical  
with respect to the air distribution system.  
Do not install the furnace directly on carpeting, tile, or  
combustible material other than wood flooring.  
When suspending the furnace from rafters or joists,  
use 3/8" threaded rod and 2” x 2” x 3/8” angle as  
shown in the Installation and Service Instructions. The  
length of the rod will depend on the application and  
clearance necessary.  
PROPANE AND HIGH ALTITUDE KITS  
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.  
LPM-051  
LPM-062  
Propane  
Convers ion Kit  
(#55 Orifices )  
HANG11  
High Altitude  
Natural Gas Kit Natural Gas Kit  
(#44 Orifices )  
HANG12  
High Altitude  
HALP 10  
High Altitude  
LP Gas Kit  
GMH95*****XA*  
(#45 Orifices)  
(#56 Orifices )  
When installed in a residential garage, the furnace  
must be positioned so the burners and ignition source  
are located not less than 18 inches (457 mm) above  
the floor and protected from physical damage by ve-  
hicles.  
1
LPM-05* supports W hite-Rodgers 2-stage valves only  
2
LPM-06* supports Honeywell and W hite-Rodgers 2-stage valves  
High altitude kits are purchased according to the installa-  
tion altitude and usage of either natural or propane gas. Refer  
to the chart above for a tabular listing of appropriate altitude  
ranges and corresponding manufacturer’s high altitude Natu-  
ral Gas and Propane Gas kits. For a tabular listing of appro-  
priate altitude ranges and corresponding manufacturer's High  
Altitude Pressure Switch kits, refer to either the Pressure  
Switch Trip Points & Usage Chart in this manual or the Ac-  
cessory Charts in Service Instructions.  
Notes:  
1. Installer must supply one or two PVC pipes: one for com-  
bustion air (optional) and one for the flue outlet (required).  
Vent pipe must be either 2” or 3” in diameter, depending  
upon furnace input, number of elbows, length of run and  
installation (1 or 2 pipes). The optional Combustion Air  
Pipe is dependent on installation/code requirements and  
must be 2” or 3” diameter PVC.  
2. Line voltage wiring can enter through the right or left side  
of the furnace. Low voltage wiring can enter through the  
right or left side of furnace.  
4
 
COMPONENT IDENTIFICATION  
Upflow/Horizontal  
1
2
3
4
5
6
7
8
9
Gas Valve  
17 Electrical Connection Inlets (Alternate)  
18 Coil Front Cover Pressure Tap  
19 Coil Front Cover Drain Port  
20 Drain Line Penetrations  
21 Drain Trap  
Gas Line Entrance (Alternate)  
Pressure Switch  
Gas Manifold  
Combustion Air Intake Connection / “Coupling”  
Hot Surface Igniter  
Rollout Limit  
Burners  
22 Blower Door Interlock Switch  
23 Capacitor  
24 Integrated Control Module  
(with fuse and diagnostic LED)  
25 24-Volt Thermostat Connections  
26 Transformer (40 VA)  
27 Circulator Blower  
Flame Sensor  
10 Flue Pipe Connection / “Coupling”  
11 Flue Pipe (Internal)  
12 Primary Limit  
13 Gas Line Entrance  
28 Auxiliary Limit  
14 Flue Pipe Connection (Alternate)  
15 Rubber Elbow  
29 Junction Box  
30 Electrical Connection Inlets  
31 Coil Front Cover  
16 Induced Draft Blower  
5
 
COMPONENT IDENTIFICATION  
GMH95*****XA*  
AIR  
DISCHARGE  
AIR  
DISCHARGE  
AIR  
INTAKE  
PIPE  
2" PVC  
RIGHT SIDE  
DRAIN LINE  
HOLES  
1 1/2  
2
1 5/8  
UNFOLDED FLANGES  
FOLDED FLANGES  
1
UNFOLDED FLANGES  
FOLDED FLANGES  
RIGHT SIDE VIEW  
Cabinet Size  
A
B
C
D
E
GMH950453BXA*  
GMH950703BXA*  
17-1/2  
16  
19-1/2  
23  
12-15/16  
12-1/8  
16  
13-5/8  
GMH950704CXA*  
GMH950904CXA*  
21  
15-15/16  
20-7/16  
17-1/2  
20-7/8  
GMH950905DXA*  
GMH951155DXA*  
24-1/2  
19-3/8  
All dimensions are in inches.  
Note: Airflow area will be reduced by approximately 18% if duct flanges are not unfolded. This could cause performance issues and  
noise issues.  
6
 
PRODUCT DESIGN  
PRESSURE SWITCH TRIP POINTS AND USAGE CHART  
NEGATIVE  
PRESSURE  
NEGATIVE  
PRESSURE  
NEGATIVE  
PRESSURE  
NEGATIVE  
PRESSURE  
PRESSURE SWITCH TRIP POINTS AND USAGE  
0 to 7,000 ft.  
7,001 to 11,000 ft.  
ID BLOWER ID BLOWER COIL COVER COIL COVER  
WITH FLUE  
NOT FIRING  
TYPICAL  
SEA  
LEVEL  
DATA(1)  
WITH FLUE  
FIRING  
TYPICAL  
SEA  
LEVE  
DATA(2)  
WITH FLUE  
NOT FIRING  
TYPICAL  
SEA  
LEVEL  
DATA(1)  
WITH FLUE  
FIRING  
TYPICAL  
SEA  
LEVE  
DATA(2)  
MODEL  
TRIP POINT COIL COVER TRIP POINT  
COIL COVER PRESSURE ID BLOWER  
ID BLOWER  
PRESSURE  
SWITCH  
TRIP POINT TRIP POINT  
COIL COVER ID BLOWER  
PRESSURE PRESSURE ALTITUDE KIT  
HIGH  
PRESSURE  
SWITCH  
SWITCH  
PART #  
PRESSURE  
SWITCH  
PART #  
SWITCH  
SWITCH  
GMH950453BXA*  
GMH950703BXA*  
GMH950704CXA*  
GMH950904CXA*  
GMH950905DXA*  
GMH951155DXA*  
-1.30  
-1.10  
-0.52  
-0.37  
-0.37  
-0.37  
-0.37  
-0.60  
-0.37  
-0.60  
20197312  
20197312  
20197312  
20197310  
20197312  
20197310  
-1.10  
-0.95  
-1.10  
-1.20  
-1.10  
-1.10  
0130F00000P  
0130F00002P  
0130F00000P  
0130F00001P  
0130F00000P  
0130F00000P  
TBD  
TBD  
TBD  
TBD  
TBD  
TBD  
TBD  
TBD  
TBD  
TBD  
TBD  
TBD  
TBD  
TBD  
TBD  
TBD  
TBD  
TBD  
-1.10  
-1.30  
-1.40  
-1.30  
-1.30  
-0.95  
-1.10  
-1.20  
-1.10  
-1.10  
-0.52  
-0.52  
-0.75  
-0.52  
-0.75  
-0.37  
-0.37  
-0.60  
-0.37  
-0.60  
(1) Data given is least negative pressure required for pressure switch to close.  
(2) Data given is the least negative pressure required for pressure switch to remain closed.  
T.O.D. PRIMARY LIMIT  
Part Number  
20162903 20162904  
Open Setting (°F)  
GMH950453BXA*  
GMH950703BXA*  
GMH950704CXA*  
GMH950904CXA*  
GMH950905DXA*  
GMH951155DXA*  
160  
150  
1
1
1
1
1
1
7
 
PRODUCT DESIGN  
ROLLOUT LIMIT SWITCHES  
Part Number 10123514 or 10123533  
Open Setting F)  
200  
1
GMH950453BXA*  
GMH950703BXA*  
GMH950704CXA*  
GMH950904CXA*  
GMH950905DXA*  
GMH951155DXA*  
2
2
2
2
2
AUXILIARY LIMIT SWITCHES  
Part Number  
10123535  
10123519  
160  
Open Setting (°F)  
GMH950453BXA*  
GMH950703BXA*  
GMH950704CXA*  
GMH950904CXA*  
GMH950905DXA*  
GMH951155DXA*  
150  
1
1
1
1
1
1
8
 
PRODUCT DESIGN  
Coil Matches:  
A large array of Amana® brand coils are available for use with the GMH95 furnaces, in either upflow or 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):  
C A P  
F 1824 A  
6
A
EXPANSION  
DEVICE:  
F: Flowrater  
REVISION  
A: Revision  
PRODUCT  
TYPE:  
C: Indoor Coil  
REFRIGERANT  
CHARGE:  
6: R-410A or R-22  
2: R-22  
4: R-410a  
CABINET FINISH:  
U: Unpainted  
P: Painted  
N: Unpainted Case  
NOMINAL WIDTH 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/Downflow Coil  
H: Horizontal A Coil  
S: Horizontal Slab Coil  
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  
• 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.  
9
 
PRODUCT DESIGN  
Thermostats:  
NOTE: Complete lineup of thermostats can be found in the Thermostat Specification Sheets.  
Filters:  
Filters are required with this furnace and must be provided by the installer. The filters used must comply with UL900 or  
CAN/ULCS111 standards. Installing this furnace without filters will void the unit warranty.  
Upflow Filters  
This furnace has provisions for the installation of return air filters at the side and/or bottom return. The furnace will  
accommodate the following filter sizes depending on cabinet size:  
BOTTOM RETURN (1)  
SIDE RETURN  
Approx.  
Approx.  
Flow Area  
Cabinet  
Width  
(in.)  
Nominal  
Filter Size  
(in.)  
Cabinet  
Width  
(in.)  
Nominal  
Filter Size  
(in.)  
Flow Area  
(in2)  
400  
(in2)  
350  
400  
500  
All  
16 x 25 x 1  
17-1/2  
21  
14 x 25 x 1  
16 x 25 x 1  
20 x 25 x 1  
24-1/2  
(1) Flanges on bottom return must be unfolded  
RefertoMinimumFilterAreatablestodeterminefilterarearequirement. NOTE:Filterscanalsobeinstalledelsewherein  
the duct system such as a central return.  
COOLING AIRFLOW REQUIREMENT (CFM)  
COOLING AIRFLOW REQUIREMENT (CFM)  
600  
194*  
---  
800  
194*  
324*  
---  
1000  
240  
324*  
291*  
432*  
---  
1200  
288  
1400 1600  
2000  
---  
600  
388*  
---  
800  
388*  
647*  
---  
1000  
480  
647*  
583*  
863*  
---  
1200  
576  
1400  
---  
1600  
---  
2000  
---  
0453BXA*  
0703BXA*  
0704CXA*  
0904CXA*  
0905DXA*  
1155DXA*  
---  
---  
0453BXA*  
0703BXA*  
0704CXA*  
0904CXA*  
0905DXA*  
1155DXA*  
324*  
291*  
432*  
388*  
486*  
336  
336  
432*  
388*  
486*  
---  
---  
647*  
583*  
863*  
777*  
971*  
672  
672  
863*  
777*  
971*  
---  
---  
---  
384  
432*  
388*  
486*  
---  
---  
768  
863*  
777*  
971*  
---  
---  
---  
---  
---  
---  
---  
---  
---  
480  
486*  
---  
---  
960  
971*  
---  
---  
---  
---  
---  
---  
*Minimum filter area dictated by heating airflow requirement.  
*Minimum filter area dictated by heating airflow requirement.  
Disposable Minimum Filter Area (in2)  
Permanent Minimum Filter Area (in2)  
[Based on a 300 ft/min filter face velocity]  
[Based on 600 ft/min filter face velocity]  
10  
 
FURNACE SPECIFICATIONS  
GMH95  
GMH95  
0453BXA*  
GMH95  
0703BXA*  
GMH95  
0704CXA*  
GMH95  
0904CXA*  
GMH95  
0905DXA*  
GMH95  
1155DXA*  
MODEL  
Btuh  
Input (US)  
46,000  
44,400  
46,000  
44,400  
95.0%  
.20 - .50  
35 - 65  
-1.10  
-0.37  
10 x 8  
1/3  
69,000  
66,400  
69,000  
66,400  
95.0%  
.20 - .50  
30 - 60  
-0.95  
-0.37  
10 x 8  
1/3  
69,000  
66,900  
69,000  
66,900  
95.0%  
.20 - .50  
35 - 65  
-1.10  
-0.37  
10 x 10  
1/2  
92,000  
89,000  
92,000  
89,000  
95.0%  
.20 - .50  
30 - 60  
-1.20  
-0.60  
10 x 10  
1/2  
92,000  
88,400  
92,000  
89,400  
95.0%  
.20 - .50  
35 - 65  
-1.10  
-0.37  
11 x 10  
3/4  
115,000  
110,500  
115,000  
110,500  
95.0%  
.20 - .50  
35 - 65  
-1.10  
-0.60  
11 x 10  
3/4  
Output (US)  
Input (CAN)  
Output (CAN)  
A.F.U.E.  
Rated External Static (" w.c.)  
Temperature Rise (°F)  
ID Blower Pressure Switch Trip Point (" w.c.)  
Front Cover Pressure Switch Trip Point (" w.c.)  
Blower Wheel (D" x W")  
Blower Horsepower  
Blower Speeds  
4
4
4
4
4
4
Max CFM @ 0.5 E.S.P.  
1200  
115-60-1  
9.4  
1200  
115-60-1  
9.4  
1600  
115-60-1  
13.8  
1600  
115-60-1  
13.8  
2000  
115-60-1  
13.2  
2000  
Power Supply  
115-60-1  
13.2  
Minimum Circuit Ampacity (MCA)(1)  
Maximum Overcurrent Device(2)  
Transformer (VA)  
15.0  
15.0  
15.0  
15.0  
15.0  
15.0  
40  
40  
40  
40  
40  
40  
Primary Limit Setting (°F)  
Auxiliary Limit Setting (°F)  
Rollout Limit Setting (°F)  
Fan Delay On Heating  
150  
160  
160  
150  
160  
160  
150  
150  
150  
150  
150  
160  
200  
200  
200  
200  
200  
200  
30 secs.  
150 secs.  
6 sec.  
45 secs.  
7 / 11  
3.5 / 10  
43 / 55  
2
30 secs.  
150 secs.  
6 sec.  
45 secs.  
7 / 11  
3.5 / 10  
43 / 55  
3
30 secs.  
150 secs.  
6 sec.  
45 secs.  
7 / 11  
3.5 / 10  
43 / 55  
3
30 secs.  
150 secs.  
6 sec.  
45 secs.  
7 / 11  
3.5 / 10  
43 / 55  
4
30 secs.  
150 secs.  
6 sec.  
45 secs.  
7 / 11  
3.5 / 10  
43 / 55  
4
30 secs.  
150 secs.  
6 sec.  
45 secs.  
7 / 11  
3.5 / 10  
43 / 55  
5
Off Heating (3)  
Fan Delay On Cooling  
Off Cooling  
Gas Supply Pressure (Natural/Propane) ("w.c.)  
Manifold Pressure (Natural/Propane) ("w.c.)  
Orifice Size (Natural/Propane)  
Number of Burners  
Vent Connector Diameter (inches)(4)  
Combustion Air Connector Diameter (inches)(5)  
Shipping Weight (lbs.)  
2
2
2
2
2
2
2
2
2
2
2
2
132  
135  
136  
158  
172  
175  
(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.  
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 by the AIR CONDITIONING CONTRACTORS OF AMERICA. The total heat loss calculated should be equal  
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.  
11  
 
BLOWER PERFORMANCE SPECIFICATIONS  
BLOWER PERFORMANCE  
(CFM & Temperature Rise vs. External Static Pressure)  
EXTERNAL STATIC PRESSURE (Inches Water Column)  
0.2 0.3 0.4 0.5  
Tons AC  
at 0.5"  
Model  
Motor  
Speed  
0.1  
0.6 0.7 0.8  
Heating Speed  
( As Shipped )  
ESP CFM RISE CFM RISE CFM RISE CFM RISE CFM RISE CFM CFM CFM  
HIGH  
MED  
3.0  
2.5  
2.0  
1.5  
3.0  
2.5  
2.0  
1.5  
4.0  
3.5  
3.0  
2.5  
4.0  
3.5  
3.0  
2.5  
5.0  
4.0  
3.5  
3.0  
5.0  
4.0  
3.5  
3.0  
1352 29 1318 30 1260 31 1202 33 1128 35 1044 955 853  
1214 32 1172 34 1123 35 1064 37 1012 39 938 859 741  
997 40 994 40 960 41 923 43 884 45 817 741 611  
757 52 753 52 734 54 704 56 674 59 620 524 438  
1449 41 1409 42 1326 45 1273 47 1201 49 1194 1136 1018  
1192 50 1172 51 1141 52 1094 54 1046 57 973 904 793  
981 61 962 62 943 63 917 65 888 67 830 764 665  
750 79 730 81 714 83 692 86 657 90 620 570 502  
2069 29 1965 30 1871 32 1756 34 1661 36 1549 1415 1275  
1752 34 1724 34 1667 36 1603 37 1488 40 1402 1290 1082  
1437 41 1437 41 1417 42 1369 43 1320 45 1256 1140 984  
1184 50 1177 50 1161 51 1132 52 1095 54 1047 928 837  
1970 40 1874 342 1757 45 1667 48 1566 51 1431 1334 1182  
1713 46 1650 48 1572 50 1510 52 1418 56 1313 1211 1079  
1439 55 1412 56 1370 58 1327 60 1260 63 1166 1078 956  
1183 67 1155 69 1122 74 1108 72 1062 75 1011 931 816  
2147 37 2114 37 2057 39 2030 39 1978 40 1889 1784 1713  
1675 47 1686 47 1640 48 1623 49 1557 51 1501 1455 1360  
1489 53 1470 54 1436 55 1409 56 1361 58 1318 1243 1130  
1307 61 1265 63 1234 64 1203 66 1168 68 1096 1053 991  
2134 46 2103 47 2029 48 1941 51 1906 51 1818 1733 1625  
1678 58 1643 60 1643 60 1577 62 1527 64 1489 1423 1339  
1453 68 1440 68 1426 69 1363 72 1349 73 1314 1253 1205  
1259 78 1239 79 1220 80 1181 83 1159 85 1118 1082 1015  
GMH950453BXA*  
(MED-HI)  
MED-LO  
LOW  
HIGH  
MED  
GMH950703BXA*  
(MED-HI)  
MED-LO  
LOW  
HIGH  
MED  
GMH950704CXA*  
(MED-HI)  
MED-LO  
LOW  
HIGH  
MED  
GMH950904CXA*  
(MED-HI)  
MED-LO  
LOW  
HIGH  
MED  
GMH950905DXA*  
(MED-HI)  
MED-LO  
LOW  
HIGH  
MED  
GMH951155DXA*  
(MED-HI)  
MED-LO  
LOW  
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. INSTALLATION IS TO BE ADJUSTED TO OBTAIN TEMPERATURE RISE WITHIN THE RANGE SPECIFIED ON THE RATING PLATE.  
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.  
12  
 
BLOWER PERFORMANCE SPECIFICATIONS  
E S I R E R U A T E R P M E T  
13  
 
WIRING DIAGRAMS  
GMH95[0453,0704,0905]*XAB  
GMH95[0703,0904,1155]*XAC  
BLOWER  
INTEGRATED  
CONTROL MODULE  
HUMIDIFIER  
24 VAC  
HUMIDIFIER  
OR  
COMPARTMENT  
DOOR SWITCH  
(OPEN WHEN  
DOOR OPEN)  
GY  
TR (6)  
GND  
24 VAC  
GND(8)  
MVC (9)  
C
GAS  
VALVE  
HI  
115 VAC  
MVH(12)  
MVL(2)  
24V THERMO T  
STA  
PM  
CONNECTIONS  
C
C
NO  
C
G
R
W
Y
ID BLOWER  
PRESSURE  
SWITCH  
FRONT COVER  
PRESSURE SWITCH  
WH  
BK  
G
Y
NO  
PS (10)  
C
PSO(4)  
HLI (7)  
TO  
OR  
FUSE  
MICRO  
GY  
3
6
1
4
2
5
PK  
OR  
W
HLO (1)  
INTEGRATED  
CONTROL  
MODULE  
9
8
7
BL  
YL  
R
RO2 (11)  
RO1 (5)  
GR  
ON  
OFF  
11  
12  
10  
2ND  
STAGE  
DELAY  
OR  
BR  
OR  
*
GY  
MODE  
RD  
GY  
*
TH(3)  
24 VAC  
HEAT  
OFF  
DELAY  
OR  
40 VA  
TRANSFORMER  
*
FACTORYSETTINGS  
SHOWN  
WH  
FS  
XFMR-H  
115 VAC  
FLAME SENSOR  
SEE  
NOTE 6  
DIAGNOSTIC  
*
2
LED  
FS  
WH  
HOT SURFACE  
IGNITER  
1
115 VAC HOT AND PARK TERMINALS  
COOL-H  
HEAT-H  
IGN  
BK  
LINE-H  
SEE  
NOTE 4  
GND  
WH  
ID  
BLWR  
BK (HI)  
BL (MED)  
OR (MED LOW)  
RD (LOW)  
IND  
PK  
YL  
RD  
BK  
COOL-H  
CIRCULATOR  
BLWR  
BR  
BR  
CAPACITOR  
PU  
ELECTRONIC  
AIR CLEANER  
BLOWER COMPARTMENT  
BURNER COMPARTMENT  
GND  
EAC-H  
LINE-H  
MANUAL RESET  
AUXILIARY LIMITS  
(1) IN UPFLOW  
BLOWER DECK  
(2) IN C'FLOW  
JUNCTION BOX  
DOOR  
SWITCH  
BK  
BLOWER HOUSING  
WH  
WH  
INDUCED DRAFT  
BLOWER  
DISCONNECT  
WH  
PU  
BL  
GND  
Ø /60 HZ POWER SUPPLY WITH  
L
N
YL  
TO 115VAC/ 1  
OR  
PK  
RD  
OR  
OVERCURRENT PROTECTION DEVICE  
N
O
C
RD  
WH  
ID BLOWER  
PRESSURE  
SWITCH  
JUNCTION  
BOX  
BL  
24 VAC  
HUMIDIFIER  
FRONT COVER  
PRESSURE SWIT  
CH  
GY  
N
O
C
1
2 CIRCUIT  
CONNECTOR  
PM  
GY  
BR  
N
WH  
BK  
GND  
GR  
GND  
HOT  
SURFACE  
IGNITER  
2
C
L
FLAME  
3
OR  
HI  
SENSOR  
GAS VALVE  
0
STEADY ON = NORMAL OPERATION  
LOW VOLTAGE (24V)  
LOW VOLTAGE FIELD  
HI VOLTAGE (115V)  
HI VOLTAGE FIELD  
JUNCTION  
EQUIPMENT GND  
FIELD GND  
OFF  
= CONTROL FAILURE  
1
2
3
4
5
6
1 FLASH  
=
2 FLASHES = PRESSURE SWITCH STUCK CLOSED  
3 FLASHES = PRESSURE SWITCH STUCK OPEN  
4 FLASHES = OPEN HIGH LIMIT  
FIELD SPLICE  
SWITCH (TEMP.)  
5 FLASHES = FLAME SENSE WITHOUT GAS VALVE  
6 FLASHES =  
IGNITER  
TERMINAL  
SWITCH (PRESS.)  
INTERNAL TO  
INTEGRATED CONTROL  
7 FLASHES = LOW FLAME SIGNAL  
7
8
C
OVERCURRENT  
PROT. DEVICE  
8 FLASHES = CHECK IGNITER OR IMPROPER GROUNDING  
CONTINUOUS/RAPID FLASHES = REVERSED 115 VAC POLARITY  
PLUG CONNECTION  
NOTES:  
PK PINK  
COLOR CODES:  
YL YELLOW  
OR ORANGE  
1. SET HEAT ANTICIPATORON ROOMTHERMOSTAT AT 0.7 AMPS.  
2. MANU 'S SPEC PARTS MUST BE USED WHENSE  
BR BROWN  
WH WHITE  
BL BLUE  
GY GRAY  
RD RED  
FACTURER IFIEDREPLACEMENT RVICING.  
3. IF ANY OF THE ORIGINAL WIRE AS SUPPLIED WITH THE FURNACE MUST BEREPLACED, IT MUST BE REPLACEDWITH WIRING MATERIAL  
°C. USECOPPERCONDUCTORS ONLY.  
HAVING A TEMPERATURERATING OF AT LEAST 105  
4. IF HEATING AND COOLINGBLOWER SPEEDS ARE NOT THE SAME, DISCARD JUMPERBEFORECONNECTING BLOWERLEADS. UNUSED  
BLOWERLEAD T BE PLA ON "PAR TERMIN OF INTEGRATEDCO TROL OR TAPED.  
PU PURPLE  
GN GREEN  
BK BLACK  
SMUS CED K" ALS  
N
5. UNIT MUST BE PERMANENTLY GROUNDEDAND CONFORMTO N.E.C. ANDLOCAL CODES.  
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)  
0140F00592 REV. A  
Wiring is subject to change, always refer to the wiring diagram on the unit for the most up-to-date wiring.  
14  
 
WIRING DIAGRAMS  
GMH95[0453,0704,0905]*XAC  
GMH95[0703,0904,1155]*XAD  
BLOWER  
INTEGRATED  
CONTROL MODULE  
HUMIDIFIER  
OR  
24 VAC  
HUMIDIFIER  
COMPARTMENT  
DOOR SWITCH  
(OPEN WHEN  
DOOR OPEN)  
GY  
TR (6)  
GND  
24 VAC  
GND (8)  
MVC (9)  
40 VA  
TRANSFORMER  
C
GAS  
VALVE  
HI  
115 VAC  
MVH (12)  
MVL(2)  
24V THERMOSTAT  
CONNECTIONS  
PM  
C
NO  
C
C
G
R
W
Y
ID BLOWER  
PRESSURE  
SWITCH  
FRONT COVER  
PRESSURE SWITCH  
WH  
BK  
G
Y
NO  
PS (10)  
C
PSO (4)  
HLI (7)  
TO  
MICRO  
OR  
FUSE  
GY  
3
6
1
2
5
PK  
OR  
W
HLO (1)  
INTEGRATED  
CONTROL  
MODULE  
4
MANUAL RESET AUXILIARY  
LIMIT CONTROLS  
AUTO RESET  
PRIMARY  
LIMIT  
9
8
7
BL  
YL  
R
RO2 (11)  
RO1 (5)  
GR  
ON  
OFF  
CONTROL  
12  
11  
10  
2ND  
STAGE  
OR  
BR  
DELAY  
OR  
MANUAL RESET ROLLOUT  
LIMIT CONTROL(S)  
(SINGLE CONTROL ON 45K BTU)  
*
*
GY  
OR  
MODE  
RD  
GY  
TH (3)  
24 VAC  
HEAT  
OFF  
DELAY  
40 VA  
TRANSFORMER  
*
FACTORY SETTINGS  
SHOWN  
*
WH  
FS  
XFMR-H  
115 VAC  
FLAME SENSOR  
SEE  
NOTE 6  
DIAGNOSTIC  
LED  
2
1
FS  
WH  
HOT SURFACE  
IGNITER  
115 VAC HOT AND PARK TERMINALS  
COOL-H  
HEAT-H  
IGN  
BK  
LINE-H  
SEE  
GND  
NOTE 4  
WH  
ID  
BLWR  
BK (HI)  
BL (MED)  
OR (MED LOW)  
RD (LOW)  
IND  
PK  
YL  
RD  
BK  
CIRCULATOR  
BLOWER  
COOL-H  
CIRCULATOR  
BLWR  
BR  
BR  
CAPACITOR  
PU  
ELECTRONIC  
AIR CLEANER  
BLOWER COMPARTMENT  
BURNER COMPARTMENT  
GND  
EAC-H  
LINE-H  
MANUAL RESET  
AUXILIARY LIMITS  
(1) IN UPFLOW  
BLOWER DECK  
(2) IN C'FLOW  
JUNCTION BOX  
DOOR  
SWITCH  
BK  
BLOWER HOUSING  
WH  
WH  
WARNING:  
INDUCED DRAFT  
BLOWER  
DISCONNECT POWER  
BEFORE SERVICING.  
WIRING TO UNIT  
MUST BE  
PROPERLY  
POLARIZED  
DISCONNECT  
WH  
PU  
BL  
AUTO RESET  
PRIMARY LIMIT  
CONTROL  
AND GROUNDED.  
GND  
L
N
YL  
TO 115VAC/ 1 Ø /60 HZ POWER SUPPLY WITH  
RD  
OR  
PK  
OR  
OVERCURRENT PROTECTION DEVICE  
N
O
C
RD  
WH  
WARNING:DISCONNECT POWER BEFORE  
SERVICING.WIRING TO UNIT MUST BE  
PROPERLY POLARIZED AND GROUNDED.  
MANUAL RESET ROLLOUT LIMIT CONTROL(S)  
( SINGLE CONTROL ON 45K BTU )  
ID BLOWER  
PRESSURE  
SWITCH  
JUNCTION  
BOX  
BL  
24 VAC  
HUMIDIFIER  
FRONT COVER  
PRESSURE SWITCH  
N
O
C
1
2 CIRCUIT  
CONNECTOR  
PM  
GY  
BR  
GY  
N
WH  
GR  
GND  
GND  
HOT  
SURFACE  
IGNITER  
3
C
BK  
L
FLAME  
SENSOR  
DISCONNECT  
2
OR  
GAS VALVE (HONEY WELL)  
HI  
0
STEADY ON = NORMAL OPERATION  
LOW VOLTAGE (24V)  
LOW VOLTAGE FIELD  
HI VOLTAGE (115V)  
HI VOLTAGE FIELD  
JUNCTION  
EQUIPMENT GND  
FIELD GND  
OFF  
= CONTROL FAILURE  
1
2
3
4
5
6
7
8
C
1 FLASH  
=
SYSTEM LOCKOUT (RETRIES EXCEEDED)  
2 FLASHES = PRESSURE SWITCH STUCK CLOSED  
3 FLASHES = PRESSURE SWITCH STUCK OPEN  
FIELD SPLICE  
SWITCH (TEMP.)  
4 FLASHES = OPEN HIGH LIMIT  
5 FLASHES = FLAME SENSE WITHOUT GAS VALVE  
IGNITER  
TERMINAL  
6 FLASHES  
=
OPEN ROLLOUT OR OPEN FUSE  
SWITCH (PRESS.)  
INTERNAL TO  
INTEGRATED CONTROL  
7 FLASHES = LOW FLAME SIGNAL  
OVERCURRENT  
PROT. DEVICE  
8 FLASHES = CHECK IGNITER OR IMPROPER GROUNDING  
PLUG CONNECTION  
CONTINUOUS/RAPID FLASHES = REVERSED 115 VAC POLARITY  
NOTES:  
PK PINK  
COLOR CODES:  
YL YELLOW  
OR ORANGE  
1. SET HEAT ANTICIPATOR ON ROOM THERMOSTAT AT 0.7 AMPS.  
2. MANUFACTURER'S SPECIFIED REPLACEMENT PARTS MUST BE USED WHEN SERVICING.  
BR BROWN  
WH WHITE  
BL BLUE  
3. IF ANY OF THE ORIGINAL WIRE AS SUPPLIED WITH THE FURNACE MUST BE REPLACED, IT MUST BE REPLACED WITH WIRING MATERIAL  
HAVING A TEMPERATURE RATING OF AT LEAST 105 C. USE COPPER CONDUCTORS ONLY.  
PU PURPLE  
GN GREEN  
BK BLACK  
4. IF HEATING AND COOLING BLOWER SPEEDS ARE NOT THE SAME, DISCARD JUMPER BEFORE CONNECTING BLOWER LEADS. UNUSED  
GY GRAY  
RD RED  
BLOWER LEADS MUST BE PLACED ON "PARK" TERMINALS OF INTEGRATED CONTROL OR TAPED.  
5. UNIT MUST BE PERMANENTLY GROUNDED AND CONFORM TO N.E.C. AND LOCAL CODES.  
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)  
0140F00663 REV. A  
Wiring is subject to change, always refer to the wiring diagram on the unit for the most up-to-date wiring.  
15  
 

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