Goodman GMS8 Installation instructions

PRODUCT SPECIFICATIONS
SS-GMS8 www.goodmanmfg.com 6/08
Supersedes 1/08
GMS8/GDS8/GHS8
Standard Features
Patented TuTube™ dual-diameter tubular
heat exchanger
Single-stage combination redundant gas valve
Hot surface igniter and patented adaptive
learning control for maximum igniter life
Energy-saving, quiet four-speed direct-drive
circulator blower motor
Furnace control board with self-diagnostics and low-
voltage terminal block
Quiet single-speed, induced-draft blower
Cabinet Features
Foil-faced insulation lines the heat exchanger
compartment
Designed for multi-position installation:
GMS8 and GHS8: upow, horizontal left or right
GDS8: dedicated downow
Coil and furnace t ush for most installations
Contents
Nomenclature................................................................................. 2
Product Specifications................................................................. 3
Dimensions...................................................................................... 5
Blower Performance Specications ........................................ 7
Wiring Diagrams..........................................................................10
Schematics ....................................................................................11
Accessories ....................................................................................12
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MULTI-POSITION, SINGLE-STAGE/
MULTI-SPEED GAS FURNACES
HEATING INPUT:
45,000–140,000 BTU/H
The Goodman® GMS8 / GHS8 / GDS8 80% AFUE Single-Stage,
Multi-Speed Gas Furnaces feature a patented aluminized-
steel tubular heat exchanger and energy-ecient Hot
Surface Ignition system. This furnace is run-tested for
heating or combination heating/cooling applications.
With a heavy-gauge, reinforced steel cabinet and durable
baked enamel nish, this unit can be installed in a variety
of locations.
80% AFUE
For full warranty
details, visit
www.goodmanmfg.com.

2 www.goodmanmfg.com SS-GMS8
PRODUCT SPECIFICATIONS
NOMENCLATURE
Brand Revisions
GGoodman
®
Brand A Initial Release
or Distinctions™ B 1st Revision
C 2nd Revision
Airflow Direction
C Downflow/Horizontal NOx
D Dedicated Downflo
w
N Natural Gas
H High Airflow X Low NOx
K Dedicated Upflow
M Upflow/Horizontal Cabinet Width
A 14”
Description B 17½”
V Two-Stage/Variable-speed C 21”
H Two-Stage/Multi-speed D 24½”
S Single-Stage/Multi-speed
E Two-Stage/X-13 Motor Maximum CFM @ 0.5” ESP
3 1200 5 2000
AFUE 4 1600
95 95%
9 90%+ MBTU/h
8 80% 045: 45,000 115: 115,000
070: 70,000 140: 140,000
090: 90,000
12
AB
11
X
10
M
21
GS
3
4
6,7,84,5
8045
9

SS-GMS8 www.goodmanmfg.com 3
PRODUCT SPECIFICATIONS
GMS8 SPECIFICATIONS
GMS8
0453ANB* GMS8 0703ANB* GMS8 0704BNB* GMS8 0904BNB* GMS8 0905CNB* GMS8 1155CNB* GMS8 1405DNB
Heating Capacity
Input¹ 45,000 70,000 70,000 90,000 90,000 115,000 140,000
Natural Gas Output¹ 36,000 56,000 56,000 72,000 72,000 92,000 112,000
LP Gas Output¹ 32,000 48,000 48,000 64,000 64,000 80,000 96,000
AFUE² 80 80 80 80 80 80 80
Temperature Rise Range (°F) 25 - 55 25 - 55 20 - 50 35 - 65 35 - 65 35 - 65 40 - 70
Available AC @ 0.5” ESP 3 3 4 4 5 5 5
Circulator Blower
Size (D x W) 10” x 6” 10” x 6” 10” x 8” 10” x 8” 10” x 10” 10” x 10” 10” x 10”
Horsepower @ 1750 RPM ⅓⅓½½ ½ ½¾
Speed 4 4 4 4 4 4 4
Vent Diameter³ 4” 4” 4” 4” 4” 4” 4”
No. of Burners 2 3 3 4 4 5 6
Filter Size (in²)
Permanent 290 290 385 385 480 480 480
Disposable 580 580 770 770 960 960 960
Electrical Data
Min. Circuit Ampacity48.5 8.5 12.9 12.9 12.9 12.9 15.2
Max. Overcurrent Device (amps)515 15 15 15 15 15 15
Ship Weight (lbs) 120 130 143 153 163 163 183
* Low NOx model available.
Natural Gas BTU/h. For altitudes above 2,000’, reduce input rating 4% for each 1,000’above sea level.
DOE AFUE based upon Isolated Combustion System (ICS)
Vent and combustion air diameters 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).
Minimum Circuit Ampacity = (1.25 x Circulator Blower Amps) + ID Blower amps. Wire size should be determined in accordance with National Electri-
cal Codes. Extensive wire runs will require larger wire sizes.
Maximum Overcurrent Protection Device 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.
1–
2–
3–
4–
5–
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4 www.goodmanmfg.com SS-GMS8
PRODUCT SPECIFICATIONS
GDS8/GHS8 SPECIFICATIONS
GDS8
0453AXB GDS8 0703AXB GDS8 0904BXB GDS8 1155CXB GHS8 0453AXB GHS8 0704BXB GHS8 0905CXB
Heating Capacity
Input¹ 45,000 70,000 90,000 115,000 45,000 70,000 90,000
Natural Gas Output¹ 36,000 56,000 72,000 92,000 36,000 56,000 72,000
LP Gas Output¹ 32,000 48,000 64,000 80,000 32,000 48,000 64,000
AFUE² 80 80 80 80 80 80 80
Temperature Rise Range (°F) 20 - 50 30 - 60 35 - 65 40 - 70 15 - 45 20 - 50 35 - 65
Available AC @ 0.5” ESP 3 3 4 5 3 4 5
Circulator Blower
Size (D x W) 10” x 6” 10” x 6” 10” x 8” 10” x 10” 10” x 6” 10” x 8” 11” x 10”
Horsepower @ 1750 RPM ⅓⅓½½½¾¾
Speed 4 4 4 4 4 3 3
Vent Diameter³ 4” 4” 4” 4” 4” 4” 4”
No. of Burners 2 3 4 5 2 3 4
Filter Size (in²)
Permanent 290 290 385 480 290 385 480
Disposable 580 580 770 960 580 770 960
Electrical Data
Min. Circuit Ampacity48.5 8.5 12.9 12.9 12.9 12.2 12.2
Max. Overcurrent Device (amps)515 15 15 15 15 15 15
Ship Weight (lbs) 120 130 153 175 120 130 153
Natural Gas BTU/h. For altitudes above 2,000’, reduce input rating 4% for each 1,000’above sea level.
DOE AFUE based upon Isolated Combustion System (ICS)
Vent and combustion air diameters 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).
Minimum Circuit Ampacity = (1.25 x Circulator Blower Amps) + ID Blower amps. Wire size should be determined in accordance with National Electri-
cal Codes. Extensive wire runs will require larger wire sizes.
Maximum Overcurrent Protection Device 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 exist-
ing local codes.
1–
2–
3–
4–
5–
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SS-GMS8 www.goodmanmfg.com 5
PRODUCT SPECIFICATIONS
GMS8/GHS8 DIMENSIONS
Model A B Model A B
GMS80453ANB* 14” 12½” GHS80453AXB 14” 12½”
GMS80703ANB* 14” 12½” GHS80704BXB 17½” 16”
GMS80704BNB* 17½” 16” GHS80905CXB 21” 19½”
GMS80904BNB* 17½” 16”
GMS80905CNB* 21” 19½”
GMS81155CNB* 21” 19½”
GMS81405DNB 24½” 23”
* Low NOx model available.
MINIMUM CLEARANCES TO COMBUSTIBLE MATERIALS
Sides Rear Front¹ Vent² Top
SW B
1” 0” 3” 6” 1” 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: GMS8 and GHS8 models approved for line contact in the horizontal position.
ALT. VENT LOCATION
GAS LOCATION
HIGH VOLTAGE
INLET
LOW VOLTAGE




ALT. LOW VOLTAGE
ALT. GAS INLET
ALT. VENT LOCATION
ALT. HIGH VOLTAGE






&
'









28”
39”
47/16”
3¼”
15/16”
123/16”
26½”
143/16”
1⅜”1⅜”
143/16”
271/16”
95/16”
3⅛”
3¼”
21/16”
15/16”
19⅝”

6 www.goodmanmfg.com SS-GMS8
PRODUCT SPECIFICATIONS
Model A B Non-Combustible
Floor Base
GDS80453AXB* 14” 12½” SBT14
GDS80703AXB* 14” 12½” SBT14
GDS80904BXB* 17½” 16” SBT17
GDS81155CXB* 21” 19½” SBT21
* Low NOx model available.
GDS8 DIMENSIONS
Sides Rear Front¹ Vent² Top
SW B
1” 0” 3” 6” 1” 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).
MINIMUM CLEARANCES TO COMBUSTIBLE MATERIALS









&
'
GAS INLET
ALT. GAS INLET
HIGH VOLTAGE
LOW VOLTAGE


SS-GMS8 www.goodmanmfg.com 7
PRODUCT SPECIFICATIONS
BLOWER PERFORMANCE SPECIFICATIONS
(CFM & Temperature Rise vs. External Static Pressure)
Model Motor
Speed Tons AC¹
External Static Pressure, (Inches Water Column)
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
CFM Rise CFM Rise CFM Rise CFM Rise CFM Rise CFM CFM CFM
GMS8
0453ANB*
(Med)²
High 3.0 1,555 --- 1,511 --- 1,459 --- 1,392 --- 1,344 25 1,279 1,201 1,120
Med 2.5 1,165 28 1,123 30 1,100 30 1,090 30 1,048 32 1,017 970 903
Med-Lo 2.0 927 36 907 37 889 37 863 38 853 39 822 800 746
Low 1.5 699 47 694 48 668 50 645 51 636 52 592 566 524
GMS8
0703ANB*
(Med)²
High 3.0 1,437 36 1,310 39 1,295 40 1,310 39 1,273 41 1,202 1,129 1,039
Med 2.5 1,127 46 1,100 47 1,095 47 1,075 48 1,050 49 1,018 967 904
Med-Lo 2.0 895 --- 917 --- 878 --- 867 --- 853 --- 830 786 743
Low 1.5 694 --- 681 --- 663 --- 640 --- 625 --- 591 562 522
GMS8
0704BNB*
(Med)²
High 4.0 2,234 23 2,151 24 2,076 25 1,990 26 1,897 27 1,803 1,710 1,569
Med 3.5 1,676 31 1,653 31 1,648 31 1,581 33 1,555 33 1,492 1,414 1,352
Med-Lo 3.0 1,342 38 1,335 39 1,321 39 1,313 39 1,291 40 1,261 1,215 1,149
Low 2.5 1,089 47 1,085 48 1,078 48 1,071 48 1,057 49 1,040 986 932
GMS8
0904BNB*
(Med)²
High 4.0 2,182 --- 2,127 31 2,056 32 1,974 33 1,895 35 1,809 1,715 1,588
Med 3.5 1,645 40 1,628 40 1,615 40 1,597 41 1,541 43 1,491 1,440 1,350
Med-Lo 3.0 1,320 49 1,305 49 1,310 49 1,310 50 1,295 51 1,267 1,217 1,139
Low 2.5 1,063 60 1,061 60 1,057 61 1,056 61 1,039 61 1,025 1,005 948
GMS8
0905CNB*
(Med)²
High 5.0 2,334 --- 2,334 --- 2,284 --- 2,135 --- 2,051 35 1,910 1,748 1,605
Med 4.0 1,754 39 1,735 39 1,728 40 1,685 40 1,628 42 1,551 1,469 1,346
Med-Lo 3.5 1,367 47 1,380 47 1,371 47 1,374 48 1,335 50 1,293 1,246 1,165
Low 3.0 1,098 58 1,109 59 1,109 59 1,088 60 1,066 62 1,050 998 916
GMS8
1155CNB*
(Med)²
High 5.0 2,481 --- 2,395 35 2,288 37 2,217 38 2,076 41 1,999 1,858 1,732
Med 4.0 1,738 49 1,732 49 1,709 50 1,686 50 1,639 52 1,585 1,492 1,385
Med-Lo 3.5 1,364 62 1,378 62 1,372 62 1,372 62 1,350 63 1,313 1,261 1,125
Low 3.0 1,137 --- 1,142 --- 1,140 --- 1,114 --- 1,090 --- 1,056 954 860
GMS8
1405DNB
(Med)²
High 5.0 2,554 41 2,435 43 2,375 44 2,240 47 2,152 49 2,002 1,883 1,744
Med 4.0 1,846 57 1,773 59 1,762 60 1,712 61 1,672 63 1,583 1,526 1,442
Med-Lo 3.5 1,520 69 1,500 70 1,483 --- 1,470 --- 1,435 --- 1,373 1,308 1,245
Low 3.0 1,301 --- 1,274 --- 1,260 --- 1,231 --- 1,207 --- 1,177 1,093 931
* Low NOx model available.
¹ at 0.5” ESP
² Heating speed as shipped
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.
This 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.
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8 www.goodmanmfg.com SS-GMS8
PRODUCT SPECIFICATIONS
¹ at 0.5” ESP
² Heating speed as shipped
See Notes on previous page.•
BLOWER PERFORMANCE SPECIFICATIONS (CONT.)
(CFM & Temperature Rise vs. External Static Pressure)
Model Motor
Speed Tons AC¹
External Static Pressure, (Inches Water Column)
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
CFM Rise CFM Rise CFM Rise CFM Rise CFM Rise CFM CFM CFM
GDS8
0453AXB
(Med)²
High 3.0 1,435 --- 1,421 --- 1,380 --- 1,322 25 1,262 26 1,200 1,144 1,064
Med 2.5 1,140 29 1,114 30 1,084 31 1,063 31 1,039 32 1,002 943 897
Med-Lo 2.0 899 37 889 37 875 38 871 38 857 39 821 780 745
Low 1.5 691 48 674 49 665 50 651 51 637 52 618 562 525
GDS8
0703AXB
(Med)²
High 3.0 1,406 37 1,393 37 1,379 37 1,307 39 1,262 41 1,208 1,145 1,070
Med 2.5 1,153 45 1,101 47 1,077 48 1,039 50 1,028 50 987 947 885
Med-Lo 2.0 890 58 896 58 873 59 862 60 834 --- 798 771 727
Low 1.5 690 --- 682 --- 664 --- 631 --- 616 --- 583 549 509
GDS8
0904BXB
(Med)²
High 4.0 2,007 --- 1,993 --- 1,975 --- 1,940 --- 1,844 36 1,770 1,668 1,559
Med 3.5 1,612 41 1,606 41 1,570 42 1,533 43 1,501 44 1,448 1,373 1,301
Med-Lo 3.0 1,325 50 1,299 51 1,280 52 1,244 53 1,222 54 1,186 1,140 1,079
Low 2.5 1,043 64 1,040 64 1,032 64 1,002 --- 981 --- 955 915 869
GDS8
1155CXB
(Med)²
High 5.0 2,381 --- 2,312 --- 2,312 --- 2,219 --- 2,134 40 2,024 1,930 1,839
Med 4.0 1,801 47 1,667 51 1,667 51 1,638 52 1,613 53 1,513 1,441 1,369
Med-Lo 3.5 969 --- 1,062 --- 1,140 --- 1,223 69 1,269 67 1,292 1,322 1,358
Low 3.0 1,100 --- 1,094 --- 1,060 --- 1,031 --- 1,001 --- 953 937 874
(CFM & Temperature Rise vs. External Static Pressure)
Model Motor
Speed Tons AC¹
External Static Pressure, (Inches Water Column)
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
CFM Rise CFM Rise CFM Rise CFM Rise CFM Rise CFM Rise CFM Rise CFM Rise
GHS8
0453AXB
(Med)²
High 3.0 1,654 --- 1,647 --- 1,605 --- 1,537 --- 1,499 --- 1,493 --- 1,406 --- 1,307 25
Med 2.5 1,489 --- 1,463 --- 1,456 --- 1,416 --- 1,403 --- 1,346 25 1,271 26 1,185 28
Med-Lo 2.0 1,349 25 1,282 26 1,246 27 1,235 27 1,218 27 1,187 28 1,128 29 1,051 32
Low 1.5 1,088 30 1,086 31 1,082 31 1,069 31 1,045 32 1,013 33 968 34 908 37
GHS8
0704BXB
(Med)²
High 4.0 2,040 25 1,991 26 1,942 27 1,912 27 1,891 27 1,850 28 1,828 28 1,785 29
Med 3.5 1,563 33 1,527 34 1,490 35 1,461 35 1,444 36 1,423 36 1,401 37 1370 38
Low 3.0 1165 44 1149 45 1133 46 1122 46 1,111 46 1,089 47 1,048 49 994 52
GHS8
0905CXB
(Med)²
High 5.0 2,402 --- 2,321 --- 2,265 --- 2,193 --- 2,134 --- 2,057 --- 1,962 --- 1,895 35
Med 4.0 1,754 38 1,718 39 1,661 40 1,622 41 1,581 42 1,519 44 1,433 46 1,387 48
Low 3.5 1,266 52 1,234 54 1,177 56 1,143 58 1,071 62 1,024 65 964 --- 878 ---

SS-GMS8 www.goodmanmfg.com 9
PRODUCT SPECIFICATIONS
BLOWER PERFORMANCE SPECIFICATIONS (CONT.)
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
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

10 www.goodmanmfg.com SS-GMS8
PRODUCT SPECIFICATIONS
WIRING DIAGRAM
CAP
BK (HI)
AUXILARY
INTEGRATED
PROPERLY POLARIZED AND GROUNDED.
SERVICING.WIRING TO UNIT MUST BE
WARNING:DISCONNECT POWER BEFORE
24 VAC
FUSE
6
3
9
12
HUMIDIFIER
R
54
12
87
11 10
OR
LED
DIAGNOSTIC
LINE-H XFMR-H HEAT-H COOL-H
CONTROL MODULE
BK
115 VAC HOT AND PARK TERMINALS
2
1
GR
PU
XFMR
BK
BK
BK
115V
24V
115 VAC NEUTRAL
BR
LIMITS
WH
WH (N)
RD (LOW)
OR (MED LOW)
BL (MED)
CICULATOR BLOWER
24V THERMOSTAT CONNECTIONS
RO2 (11) LIMIT
GND (8)
HUMIDIFIER
XFMR (6) GND
G
C
W
YTO
MICRO
R
MV (12)
MVC (9)
AUXILIARY
LIMIT CONTROLS
PS (10)
PSO (4)
HLI (7)
HLO (1)
CONTROL MODULE
INTEGRATED
NO
SWITCH
PRESSURE
ID BLOWER
VALVE
M1
GAS
C2
C
AUTO RESET
PRIMARY
MANUAL RESET ROLLOUT
LIMIT CONTROL(S)
115 VAC
FLAME SENSOR
FP (2)
XFMR-H
XFMR (3)
RO1 (5)
24 VAC
HOT SURFACE
IGNITER
INTEGRATED CONTROL MODULE
BR
BR
COOL-H
IGN
IND
ID
BLWR
CIRCULATOR
HEAT-H
COOL
HEAT
BLWR
TRANSFORMER
40 VA
CONTROL
XFMR-N
INTEGRATED CONTROL MODULE
CIR-N
0140F00119 REV.00
5. UNIT MUST BE PERMANENTLY GROUNDED AND CONFORM TO N.E.C. AND LOCAL CODES.
ON SOME MODELS
HUMIDIFIER
24 VAC
INDUCED DRAFT
°C. USE COPPER CONDUCTORS ONLY.
BLOWER COMPARTMENT
BURNER COMPARTMENT
REPLACED, IT MUST BE REPLACED WITH WIRING MATERIAL HAVING A TEMPERATURE
3. IF ANY OF THE ORIGINALWIRE AS SUPPLIED WITH THE FURNACE MUST BE
CORRECT COOLING CFM. (SEE SPEC SHEET FOR AIR FLOW CHART)
REQUIREMENTS SOASTOPROVIDE THE CORRECT HEATING TEMPERATURE RISE AND THE
4. BLOWER SPEEDS SHOULD BE ADJUSTED BY INSTALLER TO MATCH THEINSTALLATION
INTEGRATED CONTROL
INTERNAL TO
2. MANUFACTURER'S SPECIFIED REPLACEMENT PARTSMUST BE USED WHEN SERVICING.
1. SET HEAT ANTICIPATOR ON ROOM THERMOSTAT AT 0.7 AMPS.
BLOWER
GAS VALVE
PRIMARY LIMIT
BK
GR
WH
IGNITER
SURFACE
HOT
M1
PU
WH
RD
WH
15 PIN PLUG
C
NO
SWITCH
PRESSURE
BR
C2
SENSOR
FLAME
BK
WH
ROLLOUT LIMITS
RAPID FLASHES=REVERSED 115 VAC POLARITY/VERIFY GND
SYSTEM LOCKOUT (RETRIES/RECYCLES EXCEEDED)
7FLASHES = LOW FLAME SIGNAL
5 FLASHES = FLAME SENSE WITHOUT GAS VALVE
4 FLASHES = OPEN HIGH LIMIT
3FLASHES = PRESSURE SWITCH STUCK OPEN
2 FLASHES = PRESSURE SWITCH STUCK CLOSED
STEADY ON = NORMAL OPERATION
OFF = CONTROL FAILURE
5
1FLASH =
0
1
2
3
4
PU
6FLASHES = OPEN ROLLOUT
COLOR CODES:
PU PURPLE
OR ORANGE
YL YELLOW
6
7
C
BK BLACK
GR GREEN
BR BROWN
PK PINK
RD RED
GY GRAY
BL BLUE
WH WHITE
PU
RATING OF AT LEAST 105
NOTES:
OVERCURRENT PROTECTION DEVICE
JUNCTION BOX
MUST BE
WARNING:
SWITCH
WIRING TO UNIT
BEFORE SERVICING.
DISCONNECT POWER
LINE-H
DOOR
AND GROUNDED.
POLARIZED
PROPERLY
L GND
LINE-N
DISCONNECT
N
SWITCH (TEMP.)
FIELD SPLICE
SWITCH (PRESS.)
PROT. DEVICE
OVERCURRENT
EQUIPMENT GND
TERMINAL
JUNCTION
HI VOLTAGE FIELD
HI VOLTAGE(115V)
LOW VOLTAGE FIELD
LOW VOLTAGE (24V)
PLUG CONNECTION
IGNITER
FIELD GND
IND-N
IGN-N
OVERCURRENT PROTECTION
POWER SUPPLY WITH
TO 115 VAC/ 1/60HZ
DEVICE
WH
BK
SWITCH LOCATED IN BLOWER
COMPARTMENT ON SOME MODELS
RD
RD
RD
BL
YL
YL
RD
BL
BL
PU
YL
YL
BR
OR
OROR
YL
YL
RD RD
WHWH
WH
YL
OR
BK
YL
BR
WH
(SINGLE CONTROLONSOME MODELS)
(SINGLE CONTROL ON SOME MODELS)
GC WYR
TO 115VAC/ 1 Ø /60 HZ POWER SUPPLY WITH
JUNCTION
BOX
GND
LINE-N
LINE H
DOOR SWITCH
Wiring is subject to change. Always refer to the wiring diagram on the unit for the most up-to-date schematic.
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.

SS-GMS8 www.goodmanmfg.com 11
PRODUCT SPECIFICATIONS
SCHEMATICS
TYPICAL SCHEMATIC
GMS8 *& GHS8 ____** MODEL FURNACES
WR 50M56-289 INTEGRATED IGNITION CONTROL
.0005
3M
K4
K2
HI
HEAT
COOL PARK
CIR
NEU
K5
GAS VALVE
HIGH
LIMIT
AUX
LIMIT
PRESSURE
SWITCH
FLAME
SENSOR
PROBE
IGNITOR
FP IGN GND MV MLV PS HLO HLI
CIRCULATOR
BLOWER
XFMR
HOT
XFMR
NEU
24 VAC
TH
RO1
RO2
R
TR
C
Y
G
W
COMPRESSOR
CONTACTOR
COIL
THERMOSTAT
R
Y
G
W
INDUCER
IND
ELECTRONIC
AIR CLEANER
EAC
EAC
NEU
K6 ROLLOUT
SWITCH
K1
FACTORY
JUMPER
FACTORY
JUMPER
PSO
K2
K3
K3
LO
HEAT
COM
PM
HI
2-STAGE
K7
TYPICAL SCHEMATIC
GMS8* & GHS8* MODEL FURNACES
WR50M56-289 INTEGRATED IGNITION CONTROL

12 www.goodmanmfg.com SS-GMS8
PRODUCT SPECIFICATIONS
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.
ACCESSORIES
THERMOSTATS
Model Description
CHT18-60 Cooling/Heating, Mechanical
CH70TG Cooling/Heating, Digital, Non-programmable
CHSATG Cooling/Heating, Mechanical
H20TWR Heating Only, Mechanical
Model Description GMS8
0453ANB* GMS8 0703ANB* GMS8 0704BNB* GMS8
0904BNB* GMS8 0905CNB* GMS8 1155CNB* GMS8 1405DNB*
LPT-00A Propane (LP)
Conversion Kit √√√√√√√
HA02 High-Altitude
Natural Gas Kit √√√√√√√
AFE18-60A Fossil Fuel Kit √√√√√√√
FTK-03A Twinning Kit √√√√√√√
Downflow Sub-base for:
SBT14 14” Furnace
SBT17 17½” Furnace
SBT21 21” Furnace
* Low NOx model available.
Model Description GDS8
0453AXB GDS8 0703AXB GDS8 0904BXB GDS8 1155CXB GHS8 0453AXB GHS8 0704BXB GHS8 0905CXB
LPT-00A Propane (LP)
Conversion Kit √√√√√√√
HA02 High-Altitude
Natural Gas Kit √√√√√√√
AFE18-60A Fossil Fuel Kit √√√√√√√
FTK-03A Twinning Kit √√√√√√√
Downflow Sub-base for:
SBT14 14” Furnace √√
SBT17 17½” Furnace √
SBT21 21” Furnace √
* Low NOx model available.