GMH8/GDH8
DUAL$AVER™ GAS FURNACES
P RODUCT S PECIFICATIONS
The Goodman® GMH8/GDH8 80% AFUE Dual$aver™
Convertible, Multi-Speed Multi-Position Gas Furnaces
feature a patented aluminized-steel tubular heat
exchanger and durable Silicon Nitride Hot Surface
Ignition system. This furnace is run-tested for heating
or combination heating/cooling applications. With a
heavy-gauge, reinforced, insulated steel cabinet and
durable baked enamel finish, this unit can be installed in
a variety of locations.
Standard Features
80% AFUE
MULTI-POSITION, CONVERTIBLE,
MULTI-SPEED
• Patented TuffTube™ dual-diameter tubular heat
exchanger with lifetime limited warranty plus 10-year
limited furnace replacement warranty*
• Two-stage gas valve with revolutionary new convertible
technology that allows installer to activate the twostage valve with the flip of a dipswitch
• Silicon Nitride igniter with patented adaptive learning
control for maximum igniter life
• Furnace control board with self-diagnostics, color-coded
low-voltage terminals and provisions for electronic air
cleaner and 24-volt humidifiers
• Control board stores the last five diagnostic codes in
memory; simple push-button activation outputs the
fault history to a flashing red LED
• Low constant fan allows homeowner to activate the low
heat speed to efficiently circulate air throughout the home
• Self-adjusting feature automatically adjusts furnace to
high or low stage based on outside temperature without an outdoor temperature sensor
Cabinet Features
HEATING INPUT: 45,000–140,000 BTU/H
• Fully insulated, heavy-gauge steel cabinet with durable
baked-enamel finish
• Foil-faced insulation lines the heat exchanger
• Designed for multi-position installation: upflow,
horizontal left or right
• Removable bottom for side or bottom return applications
• Convenient left or right connection for gas and electric service
• Coil and furnace fit flush for most installations
Online registration is required within 60 days of installation.
SS-GMH8
www.goodmanmfg.com
1/09
Supersedes 11/08
PRODUCT SPECIFICATIONS
NOMENCLATURE
G
M
H
8
70
4
B
X
A
1
2
3
4
5,6,7
8
9
10
11
Brand
G Goodman® Brand
or Distinctions™
Revisions
A Initial Release
B 1st Revision
C 2nd Revision
Airflow Direction
C Downflow/Horizontal
D Dedicated Downflow
H High Airflow
K Dedicated Upflow
M Upflow/Horizontal
NOx
N Natural Gas
X Low NOx
Description
V Two-Stage/Variable-speed
H Two-Stage/Multi-speed
S Single-Stage/Multi-speed
E Two-Stage/X-13 Motor
A
B
C
D
AFUE
95 95%
9 90%+
8 80%
Cabinet Width
14”
17½”
21”
24½”
Maximum CFM @ 0.5” ESP
3 1,200
4 1,600
5 2,000
045: 45,000
070: 70,000
090: 90,000
MBTU/h
115: 115,000
140: 140,000
ACCESSORIES
Model
Description
GMH8
All Models
GDH8
All Models
LPM-05
LP Conversion Kit (Springs & Orifice)
√
√
HA02
High-Altitude Natural Gas Kit
√
√
AFE18-60A
Fossil Fuel Kit
√
√
FTK03A
Twinning Kit
√
SBT 14/17/21*
Downflow Sub-base
√
√
* Supplied by McDaniel Metals
THERMOSTATS
Model
2
Description
CHT18-60
Cooling/Heating, Mechanical
CH70TG
Cooling/Heating, Digital, Non-programmable
CHSATG
Cooling/Heating, Mechanical
H20TWR
Heating Only, Mechanical
www.goodmanmfg.com
SS-GMH8
PRODUCT SPECIFICATIONS
90,000 90,000 90,000 115,000 140,000
72,000 72,000 72,000 92,000 112,000
64,000 64,000 64,000 80,000 96,000
80
80
80
80
80
3
4
5
5
5
30 - 60
35 - 65
40 - 70
45,000
36,000
32,000
80
25 - 55
3
70,000
56,000
48,000
80
25 - 55
3
4
4”
4
10”x 6” 10”x 6” 10”x 8” 10”x10”
⅓
⅓
½
½
4
4
4
4
4”
4”
4”
4”
2
3
4
5
385
770
GDH8
1155CX
GDH8
0703AX
GDH8
0904BX
GDH8
0453AX
GMH8
1405DN*
GMH8
1155CN*
GMH8
0905CN*
GMH8
0904BN*
GMH8
0903BN
GMH8
0704BN*
GMH8
0703AN*
GMH8
0453AN*
SPECIFICATIONS
Heating Capacity
45,000 70,000
36,000 56,000
LP Gas Output¹
32,000 48,000
AFUE²
80
80
Available AC @ 0.5” ESP
3
3
Temperature Rise Range (°F)
25 - 55
Input¹
Natural Gas Output¹
70,000
56,000
48,000
80
4
20 - 50
90,000 115,000
72,000 92,000
64,000 80,000
80
80
30 - 60 40 - 70
4
5
Circulator Blower
Size (D x W)
Horsepower @ 1750 RPM
Speed
Vent Diameter³
No. of Burners
10”x 6”
⅓
4
4
4”
4”
2
3
½
4
4”
3
10”x 8”
⅓
4
4”
4
10”x 10”
290
580
385
770
290
580
8.1
12.5
8.1
15 amps
153
½
4
4”
4
4
4”
5
¾
4
4”
6
Filter Size (in2)
Permanent4
Disposable
480
960
290
580
290
580
385
770
480
960
8.5
8.5
12.9
15 amps
130
153
12.9
Electrical Data
Min. Circuit Ampacity 5
Max. Overcurrent Device6
Ship Weight (lbs)
120
130
143
12.5
14.7
163
120
175
* Low NOx model available
1– Natural Gas BTU/h; for altitudes above 2,000’, reduce input rating 4% for each 1,000’ above sea level.
Low-fire rate is 75% of high-fire rate
2– DOE AFUE based upon Isolated Combustion System (ICS)
3– Vent diameter may vary depending upon vent length. Refer to the latest editions of the National Fuel Gas Code
NFPA 54/ANSI Z223.1 (in the USA) and the Canada National Standard of Canada, CAN/CSA B149.1 and CAN/CSA B142.2 (in Canada).
4– Permanent air filter size is based on 600 FPM velocity. Check with filter manufacturer for specific details.
5– Minimum Circuit Ampacity = (1.25 x Circulator Blower Amps) + ID Blower amps. Wire size should be determined in accordance with
National Electrical Codes. Extensive wire runs will require larger wire sizes.
6– Refers to maximum recommended fuse or circuit breaker size. May use fuses or HACR-type circuit breakers of the same size as noted.
Notes:
• All furnaces are manufactured for use on 115 VAC, 60 Hz, single-phase electrical supply.
• Gas Service Connection ½” FPT
• Important: Size fuses and wires properly and make electrical connections in accordance with the National Electrical Code and/or all existing
local codes.
SS-GMH8
www.goodmanmfg.com
3
PRODUCT SPECIFICATIONS
GMH8 DIMENSIONS
GMH8
23¾”
Model
A
B
Model
A
B
GMH80453AN*
14”
12½”
GMH80904BN*
17½”
16”
GMH80703AN*
14”
12½”
GMH80905CN*
21”
19½”
GMH80704BN*
17½”
16”
GMH81155CN*
21”
19½”
GMH80903BN
17½”
16”
GMH81405DN*
24½”
23”
* Low NOx model available.
MINIMUM CLEARANCES TO COMBUSTIBLE MATERIALS
Sides
Rear
Front¹
1”
0”
3”
Vent²
SW
B
6”
1”
Top
1”
¹ 24” clearance for serviceability recommended.
² Single Wall Vent (SW) to be used only as a connector. Refer to the latest editions of the National Fuel Gas Code NFPA
54/ ANSI Z223.1 (in the USA) and the Canada National Standard of Canada, CAN/CSA B149.1 and CAN/CSA B142.2
(in Canada).
Note: GMH8 approved for line contact in the horizontal position.
4
www.goodmanmfg.com
SS-GMH8
PRODUCT SPECIFICATIONS
GDH8 DIMENSIONS
Goodman
High Voltage
Alt. Gas Inlet
23¾”
Model
A
B
Non-Combustible Floor Base
GDH80453AXAA
14”
12½”
SBT14
GDH80703AXAA
14”
12½”
SBT14
GDH80904BXAA
17½”
16”
SBT17
GDH81155CXAA
21”
19½”
SBT21
Notes:
• Line voltage wiring can enter through the right or left side of furnace. Low-voltage wiring can enter through the
right or left side of furnace.
• Conversion kits for high-altitude natural gas operation are available. Contact your Goodman distributor or
dealer for details.
• Installer must supply the following gas line fittings, according to which entrance is used:
◊ Left: One 90º street elbow; one 2½” pipe nipple; one 90º elbow; straight pipe; one ground joint union
◊ Right: Straight pipe to reach gas valve
MINIMUM CLEARANCES TO COMBUSTIBLE MATERIALS
Sides
Rear
Front¹
1”
0”
3”
Vent²
SW
B
6”
1”
Top
1”
¹ 24” clearance for serviceability recommended.
² Single Wall Vent (SW) to be used only as a connector. Refer to the latest editions of the National Fuel Gas Code NFPA 54/
ANSI Z223.1 (in the USA) and the Canada National Standard of Canada, CAN/CSA B149.1 and CAN/CSA B142.2 (in Canada).
SS-GMH8
www.goodmanmfg.com
5
PRODUCT SPECIFICATIONS
GMH8 BLOWER PERFORMANCE SPECIFICATIONS
(CFM & Temperature Rise vs. External Static Pressure)
External Static Pressure, (Inches Water Column)
Tons AC
at 0.5”
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
ESP
CFM Rise CFM Rise CFM Rise CFM Rise CFM Rise CFM CFM CFM
Model
(Heating Speed
as Shipped)
Motor
Speed
GMH80453AN*
(Medium)
High
Med
Med-Lo
Low
3
2.5
2
1.5
1,555
1,165
927
699
--28
36
47
1,511
1,123
907
694
--30
37
48
1,459
1,100
889
668
--30
37
50
1,392
1,090
863
645
--30
38
51
1,344
1,048
853
636
25
32
39
52
1,279
1,017
822
592
1,201
970
800
566
1,120
903
746
524
GMH80703AN*
(Medium)
High
Med
Med-Lo
Low
3
2.5
2
1.5
1,437
1,127
895
694
36
46
-----
1,310
1,100
917
681
39
47
-----
1,295
1,095
878
663
40
47
-----
1,310
1,075
867
640
39
48
-----
1,273
1,050
853
625
41
49
-----
1,202
1,018
830
591
1,129
967
786
562
1,039
904
743
522
GMH80704BN*
(Medium)
High
Med
Med-Lo
Low
4
3.5
3
2.5
2,234
1,676
1,342
1,089
23
31
38
47
2,151
1,653
1,335
1,085
24
31
39
48
2,076
1,648
1,321
1,078
25
31
39
48
1,990
1,581
1,313
1,071
26
33
39
48
1,897
1,555
1,291
1,057
27
33
40
49
1,803
1,492
1,261
1,040
1,710
1,414
1,215
986
1,569
1,352
1,149
932
GMH80903BN
(Medium)
High
Med
Med-Lo
Low
3
2.5
2
1.5
1,593
1,186
957
742
42
56
-----
1,561
1,160
940
710
43
57
-----
1,567
1,160
937
685
42
57
-----
1,543
1,135
921
663
43
58
-----
1,493
1,118
895
635
44
59
-----
1,420
1,089
861
611
1,343
1,045
826
578
1,230
983
778
476
GMH80904BN*
(Medium)
High
Med
Med-Lo
Low
4
3.5
3
2.5
2,182
1,645
1,320
1,063
--40
49
60
2,127
1,628
1,305
1,061
31
40
49
60
2,056
1,615
1,310
1,057
32
40
49
61
1,974
1,597
1,310
1,056
33
41
50
61
1,895
1,541
1,295
1,039
35
43
51
61
1,809
1,491
1,267
1,025
1,715
1,440
1,217
1,005
1,588
1,350
1,139
948
GMH80905CN*
(Medium)
High
Med
Med-Lo
Low
5
4
3.5
3
2,334
1,754
1,367
1,098
--39
47
58
2,334
1,735
1,380
1,109
--39
47
59
2,284
1,728
1,371
1,109
--40
47
59
2,135
1,685
1,374
1,088
--40
48
60
2,051
1,628
1,335
1,066
35
42
50
62
1,910
1,551
1,293
1,050
1,748
1,469
1,246
998
1,605
1,346
1,165
916
GMH81155CN*
(Medium)
High
Med
Med-Lo
Low
5
4
3.5
3
2,481
1,738
1,364
1,137
--49
62
---
2,395
1,732
1,378
1,142
35
49
62
---
2,288
1,709
1,372
1,140
37
50
62
---
2,217
1,686
1,372
1,114
38
50
62
---
2,076
1,639
1,350
1,090
41
52
63
---
1,999
1,585
1,313
1,056
1,858
1,492
1,261
954
1,732
1,385
1,125
860
GMH81405DN*
(Medium)
High
Med
Med-Lo
Low
5
4
3.5
3
2,554
1,846
1,520
1,301
41
57
69
---
2,435
1,773
1,500
1,274
43
59
70
---
2,375
1,762
1,483
1,260
44
60
-----
2,240
1,712
1,470
1,231
47
61
-----
2,152
1,672
1,435
1,207
49
63
-----
2,002
1,583
1,373
1,177
1,883
1,526
1,308
1,093
1,744
1,442
1,245
931
* Low NOx model available.
Notes:
• CFM in chart is without filter(s). Filters do not ship with this furnace, but must be provided by the installer.
• All furnaces ship as high-speed cooling and medium-speed heating. Installer must adjust blower cooling and heating speed as needed.
• For most applications, about 400 CFM per ton when cooling is desirable.
• INSTALLATION IS TO BE ADJUSTED TO OBTAIN TEMPERATURE RISE WITHIN THE RANGE SPECIFIED ON THE RATING PLATE.
• The chart is for information only. For satisfactory operation, external static pressure should not exceed value shown on the rating plate.
The shaded area indicates ranges in excess of recommended maximum heating static pressure.
• The dashed (----) areas indicate a temperature rise not recommended for this model.
• The above chart is for 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 ESP at the CFM will be lower.
6
www.goodmanmfg.com
SS-GMH8
SS-GMH8
www.goodmanmfg.com
10
20
30
40
50
60
70
30
80
90
100
40
50
60
700
600 CFM
90
100
2000
2200
2400 CFM
1800
1600
1400
OUTPUT BTU/HR x 1000
80
1200
1100
1000
900
70
800
FORMULAS
110
120
130
140
BTU OUTPUT = CFM x 1.08 x RISE
BTU OUTPUT
RISE =
÷ CFM
1.08
BTU OUTPUT vs TEMPERATURE RISE CHART
150
PRODUCT SPECIFICATIONS
GMH8 BLOWER PERFORMANCE DATA CHART
7
TEMPERATURE RISE
PRODUCT SPECIFICATIONS
GDH8 BLOWER PERFORMANCE SPECIFICATIONS
(CFM & Temperature Rise vs. External Static Pressure)
Model
Tons
(Heating Motor AC at
Speed as Speed 0.5”
Shipped)
ESP
External Static Pressure, (Inches Water Column)
0.2
0.3
0.4
0.5
0.6
0.1
CFM
Rise
CFM
Rise
CFM
Rise
CFM
Rise
CFM
Rise
CFM
0.7
0.8
CFM
CFM
GDH8
0453AX
(Med)
High
Med
Med-Lo
Low
3.0
2.5
2.0
1.5
1,435
1,140
899
691
--29
37
48
1,421
1,114
889
674
--30
37
49
1,380
1,084
875
665
--31
38
50
1,322
1,063
871
651
25
31
38
51
1,262
1,039
857
637
26
32
39
52
1,200 1,144 1,064
1,002 943
897
821
780
745
618
562
525
GDH8
0703AX
(Med)
High
Med
Med-Lo
Low
3.0
2.5
2.0
1.5
1,406
1,153
890
690
37
45
-----
1,393
1,101
896
682
37
47
-----
1,379
1,077
873
664
37
48
-----
1,307
1,039
862
631
39
50
-----
1,262
1,028
834
616
41
50
-----
1,208 1,145 1,070
987
947
885
798
771
727
583
549
509
GDH8
0904BX
(Med)
High
Med
Med-Lo
Low
4.0
3.5
3.0
2.5
2,007
1,612
1,325
1,043
--41
50
---
1,993
1,606
1,299
1,040
--41
51
---
1,975
1,570
1,280
1,032
--42
52
---
1,940
1,533
1,244
1,002
--43
53
---
1,844
1,501
1,222
981
36
44
54
---
1,770 1,668 1,559
1,448 1,373 1,301
1,186 1,140 1,079
955
915
869
GDH8
1155CX
(Med)
High
Med
Med-Lo
Low
5.0
4.0
3.5
3.0
2,381
1,801
969
1,100
--47
-----
2,312
1,667
1,062
1,094
--51
-----
2,312
1,667
1,140
1,060
--51
-----
2,219
1,638
1,223
1,031
--52
69
---
2,134
1,613
1,269
1,001
40
53
67
---
2,024 1,930 1,839
1,513 1,441 1,369
1,292 1,322 1,358
953
937
874
Notes:
• CFM in chart is without filter(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.
• All furnaces ship as high-speed cooling and medium-speed heating. Installer must adjust blower cooling and heating speed as needed.
• For most jobs, about 400 CFM per ton when cooling is desirable.
• INSTALLATION IS TO BE ADJUSTED TO OBTAIN TEMPERATURE RISE WITHIN THE RANGE SPECIFIED ON THE RATING PLATE.
• The chart is for information only. For satisfactory operation, external static pressure should not exceed value shown on the rating plate.
The shaded area indicates ranges in excess of recommended maximum heating static pressure.
• The dashed (----) areas indicate a temperature rise not recommended for this model.
• The above chart is for U.S. furnaces installed at 0-2000 feet. At higher altitudes, a properly derated unit will have approximately the same
temperature rise at a particular CFM, while ESP at the CFM will be lower.
8
www.goodmanmfg.com
SS-GMH8
SS-GMH8
www.goodmanmfg.com
10
20
30
40
50
60
70
30
80
90
100
40
50
60
700
600 CFM
90
100
2000
2200
2400 CFM
1800
1600
1400
OUTPUT BTU/HR x 1000
80
1200
1100
1000
900
70
800
FORMULAS
110
120
130
140
BTU OUTPUT = CFM x 1.08 x RISE
BTU OUTPUT
RISE =
÷ CFM
1.08
BTU OUTPUT vs TEMPERATURE RISE CHART
150
PRODUCT SPECIFICATIONS
GDH8 BLOWER PERFORMANCE DATA CHART
9
TEMPERATURE RISE
PRODUCT SPECIFICATIONS
GMH8 WIRING DIAGRAM
WARNING:DISCONNECT POWER BEFORE
SERVICING.WIRING TO UNIT MUST BE
PROPERLY POLARIZED AND GROUNDED.
INTEGRATED
CONTROL MODULE
HUMIDIFIER
XFMR (6)
GND
GND (8)
24 VAC
HUM ID IFIER
C2
MVC (9)
HI
GAS
VALVE
MVH (12)
M1
MVL (2)
C
G
R
W
24V THERMOSTAT CONNECTIONS
C
Y
5 MIN
2 STG
MODE
BR
7
8
BL
9
4
5
6
1
2
3
AUXILARY
LIMITS
BR
INTEGRATED
CONTROL MODULE
ID BLOWER
PRESSURE
SWITCH
G
PS ( 10)
Y
TO
MICRO
PSO (4)
HLI (7)
W
HLO (1)
R
RO2 (11)
RO1 (5)
XFMR (3)
24 VAC
RD
RD
40 VA
TRANSFORMER
BR
BL
NO
C
RD
PU
XFMR-H
FLAME SENSOR
OR
2
XFMR-N
115 VAC
YL
YL
1
FP
HOT SURFAC E
IGNITER
BK
BK
24V
XFMR
IND-N
CIRCULATOR
BLWR
BK
15 PIN PLUG
ON SOME MODELS
GR
ID
BLWR
IND
EAC-H
ELECTRONIC
AIR CLEANER
LINE-N
JUNCTION BOX
BURNER COMPARTMENT
BK
WH
DOOR
SWITCH
24 VAC
HUMIDIFIER
DOOR SW ITCH
SWITCH LOCATED IN BLOWER
COMPARTMENT ON SOME MODELS
NO
EAC-N
LINE-H
BLOW ER COMPARTMENT
C
OR
RD
CIR-N
CAP
BR
WH
BR
BR
CICULATOR
BLOWER
BR
BL
115V
IGN-N
INTEGRATED CONTROL MODULE
PARK
INTEGRATED CONTROL MODULE
BK (HI)
BL (MED)
OR(MED LOW)
RD (LOW)
WH (N)
PU
WH
IGN
RD
WH
WH
YL
PRIMARY LIMIT
PRESSURE
SWITCH
DISCONNECT
YL
RD
YL
YL
WH
BK
L
BR
GND
N
TO 115VAC/ 1 Ø /60 HZ POWER SUPPLY WITH
OVERCURRENT PROTECTION DEVICE
BL
BR
BK
PM
1
HOT
SURFACE
IGNITER
C
2
HI
3
JUNCTION
BOX
WH
2 STAGE
GAS VALV E
LINE-N
GND
LINE H
PU
INDUCED DRAFT
BLOWER
PU
PU
FLAME
SENSOR
ROLLOU T LIMITS
(SINGLE CONTROL ON SOME MODELS)
0
STEADY ON = NORMAL OPERATION
OFF
TO 115 VAC / 1/60HZ
POWER SUPPLY WITH
OVERCURRENT PROTECTION
DEVICE
LOW VOLTAGE (24V)
= CONTROL FAILURE
LOW VOLTAGE FIELD
= SYSTEM LOCKOUT (RETRIES/RECYCLES EXCEEDED)
1
FLASH
2
FLASHES = PRESSURE SWITCH STUCK CLOSED
HI VOLTAGE (115V)
FLASHES = PRESSURE SWITCH STUCK OPEN
FLASHES = OPEN HIGH LIMIT
JUNCTION
5
FLASHES = FLAME SENSE WITHOUT GAS VALVE
TERMINAL
6
FLASHES = OPEN ROLLOUT OR OPEN FUSE
7
FLASHES = LOW FLAME SIGNAL
C
RAPID FLASHES = REVERSED 115 VAC POLARITY/VERIFY GND
PK PINK
BR BROWN
WH WHITE
BL BLUE
GY GRAY
RD RED
FIELD GND
FIELD SPLICE
HI VOLTAGE FIELD
3
4
COLOR CODES:
YL YELLOW
OR ORANGE
PU PURPLE
GR GREEN
BK BLACK
EQUIPMENT GND
SWITCH (TEMP.)
INTERNAL TO
INTEGRATED CONTROL
PLUG CONNECTION
IGNITER
SWITCH (PRESS.)
OVERCURRENT
PROT. DEVICE
NOTES:
1. SET HEAT ANTICIPATOR ON ROOM THERMOSTAT AT 0.7 AMPS.
2. MANUFACTURER'S SPECIFIED REPLACEMENT PARTS MUST BE USED WHEN SERVICING.
3. IF ANY OF THE ORIGINAL WIRE AS SUPPLIED WITH THE FURNACE MUST BE
REPLACED, IT MUST BE REPLACED WITH WIRING MATERIAL HAVING A TEMPERATURE
RATING OF AT LEAST 105°C. USE COPPER CONDUCTORS ONLY.
4. BLOWER SPEEDS SHOULD BE ADJUSTED BY INSTALLER TO MATCH THE INSTALLATION
REQUIREMENTS SO AS TO PROVIDE THE CORRECT HEATING TEMPERATURE RISE AND THE
CORRECT COOLING CFM. (SEE SPEC SHEET FOR AIR FLOW CHART)
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).
Wiring is subject to change. Always refer to the wiring diagram on the unit for most up-to-date wiring.
WARNING
10
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.
www.goodmanmfg.com
SS-GMH8
PRODUCT SPECIFICATIONS
GDH8 WIRING DIAGRAM
WARNING:DISCONNECT POWER BEFORE
SERVICING.WIRING TO UNIT MUST BE
PROPERLY POLARIZED AND GROUNDED.
INTEGRATED
CONTROL MODULE
HUMIDIFIER
XFMR (6)
GND
GND (8)
24 VAC
HUM ID IFIER
C2
MVC (9)
HI
GAS
VALVE
MVH (12)
M1
MVL (2)
C
G
R
W
24V THERMOSTAT CONNECTIONS
C
Y
5 MIN
2 STG
MODE
BR
7
8
4
5
6
1
2
3
BL
9
AUXILARY
LIMITS
BR
INTEGRATED
CONTROL MODULE
ID BLOWER
PRESSURE
SWITCH
G
PS ( 10)
Y
TO
MICRO
PSO (4)
HLI (7)
W
HLO (1)
R
RO2 (11)
RO1 (5)
XFMR (3)
24 VAC
RD
RD
40 VA
TRANSFORMER
BR
BL
NO
C
RD
PU
XFMR-H
FLAME SENSOR
OR
2
XFMR-N
115 VAC
YL
YL
1
FP
HOT SURFAC E
IGNITER
BK
BK
24V
XFMR
IND-N
CIRCULATOR
BLWR
BK
15 PIN PLUG
ON SOME MODELS
GR
ID
BLWR
IND
EAC-H
ELECTRONIC
AIR CLEANER
LINE-N
JUNCTION BOX
BURNER COMPARTMENT
BK
WH
DOOR
SWITCH
24 VAC
HUMIDIFIER
DOOR SW ITCH
SWITCH LOCATED IN BLOWER
COMPARTMENT ON SOME MODELS
NO
EAC-N
LINE-H
BLOW ER COMPARTMENT
C
OR
RD
RD
CIR-N
CAP
BR
WH
BR
BR
CICULATOR
BLOWER
BR
BL
115V
IGN-N
INTEGRATED CONTROL MODULE
PARK
INTEGRATED CONTROL MODULE
BK (HI)
BL (MED)
OR(MED LOW)
RD (LOW)
WH (N)
PU
WH
IGN
WH
WH
YL
PRIMARY LIMIT
PRESSURE
SWITCH
DISCONNECT
YL
RD
YL
YL
WH
BK
L
BR
GND
N
TO 115VAC/ 1 Ø /60 HZ POWER SUPPLY WITH
OVERCURRENT PROTECTION DEVICE
BL
BR
BK
PM
1
HOT
SURFACE
IGNITER
C
2
HI
3
JUNCTION
BOX
WH
2 STAGE
GAS VALV E
LINE-N
GND
LINE H
PU
INDUCED DRAFT
BLOWER
PU
PU
FLAME
SENSOR
ROLLOU T LIMITS
(SINGLE CONTROL ON SOME MODELS)
STEADY ON = NORMAL OPERATION
0
OFF
LOW VOLTAGE (24V)
= CONTROL FAILURE
LOW VOLTAGE FIELD
= SYSTEM LOCKOUT (RETRIES/RECYCLES EXCEEDED)
1
FLASH
2
FLASHES = PRESSURE SWITCH STUCK CLOSED
HI VOLTAGE (115V)
FLASHES = OPEN HIGH LIMIT
JUNCTION
5
FLASHES = FLAME SENSE WITHOUT GAS VALVE
TERMINAL
6
FLASHES = OPEN ROLLOUT OR OPEN FUSE
7
FLASHES = LOW FLAME SIGNAL
C
RAPID FLASHES = REVERSED 115 VAC POLARITY/VERIFY GND
PK PINK
BR BROWN
WH WHITE
BL BLUE
GY GRAY
RD RED
FIELD GND
FIELD SPLICE
SWITCH (TEMP.)
4
COLOR CODES:
YL YELLOW
OR ORANGE
PU PURPLE
GR GREEN
BK BLACK
EQUIPMENT GND
HI VOLTAGE FIELD
FLASHES = PRESSURE SWITCH STUCK OPEN
3
TO 115 VAC / 1/60HZ
POWER SUPPLY WITH
OVERCURRENT PROTECTION
DEVICE
INTERNAL TO
INTEGRATED CONTROL
PLUG CONNECTION
IGNITER
SWITCH (PRESS.)
OVERCURRENT
PROT. DEVICE
NOTES:
1. SET HEAT ANTICIPATOR ON ROOM THERMOSTAT AT 0.7 AMPS.
2. MANUFACTURER'S SPECIFIED REPLACEMENT PARTS MUST BE USED WHEN SERVICING.
3. IF ANY OF THE ORIGINAL WIRE AS SUPPLIED WITH THE FURNACE MUST BE
REPLACED, IT MUST BE REPLACED WITH WIRING MATERIAL HAVING A TEMPERATURE
RATING OF AT LEAST 105°C. USE COPPER CONDUCTORS ONLY.
4. BLOWER SPEEDS SHOULD BE ADJUSTED BY INSTALLER TO MATCH THE INSTALLATION
REQUIREMENTS SO AS TO PROVIDE THE CORRECT HEATING TEMPERATURE RISE AND THE
CORRECT COOLING CFM. (SEE SPEC SHEET FOR AIR FLOW CHART)
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).
Wiring is subject to change. Always refer to the wiring diagram on the unit for most up-to-date wiring.
WARNING
SS-GMH8
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.
www.goodmanmfg.com
11
PRODUCT SPECIFICATIONS
DUAL$AVER CONFIGURATION & OPERATION
Dual$aver
This furnace is capable of the following heating modes:
• Single Stage (Factory Setting)
• Modified Two-Stage
» Fixed 5-Min Low Stage
» Auto Time (1-12 Min) Low Stage
To change from the factory single-stage operation, adjust the
dipswitches on the ignition control as follows:
Off On
Mode
5 Min Fixed
Auto
Mode Dipswitch
2nd Stage Delay Dipswitch
Note: This furnace is designed to be used with a single-stage room
thermostat.
Start
Start
Call for Heat
Call for Heat
Safety Circuit Check
Safety Circuit Check
Start Furnace
in Low Stage
Low-Heat Blower
Start Furnace
in Low Stage
Low-Heat Blower
Delay Time (5 Min)
Delay Time (1-12 Min)
Gas Valve Switch
to 2nd Stage
Gas Valve Switch
to 2nd Stage
Blower Switch to
Hi Heat Operation
Blower Switch to
Hi Heat Operation
T-Stat Satisfied
T-Stat Satisfied
Goodman Manufacturing Company, L.P., reserves the right to discontinue, or change at any time, specifications or designs without notice
or without incurring obligations. © 2008 • Goodman Manufacturing Company, L.P. • Houston, Texas • Printed in the USA.
12
www.goodmanmfg.com
SS-GMH8