Goodman Mfg Co Lp Furnace Gms8 33 3 8 Gas Units Users Manual

RT6621031r2 to the manual f49177a5-82dd-4328-b268-ed7844e8a0c0

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TECHNICAL MANU
AL
MANUAL
GMS8 33-3/8" Gas Furnace Units
80% AFUE, Single Stage,
Multi-Speed, Upflow Horizontal
• Refer to Service Manual RS6612006 for troubleshooting information.
• Refer to the appropriate Parts Catalog for part number information.
• Model numbers listed on page 3.

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 performed by an unqualified
person.

Copyright © 2013 Goodman Manufacturing Company, L.P.

RT6621031r2
November 2013

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.

G

M

PRODUCT
TYPE:
G: Goodman

S

8

040

FURNACE
TYPE
S: Single-Stage/
Multi-Speed

AFUE
8: 80%

WARNING

NOMINAL INPUT
040: 40,000 Btuh
060: 60,000 Btuh
080: 80,000 Btuh
100: 100,000 Btuh
120: 120,000 Btuh
140: 140,000 Btuh

X

AIRFLOW
CAPABILITY
3: 1200
4: 1600
5: 2000

A

A

MAJOR REVISION
A: Initial Release

MINOR REVISION
A: Initial Release

ADDITIONAL
FEATURES
N: Natural Gas
X: Low NOx

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.

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

A

CABINET
WIDTH
A: 14"
B: 17-1/2"
C: 21"
D: 24-1/2"

SUPPLY TYPE
M: Upflow/Horizontal

2

3

Installation and repair of this unit
should be performed ONLY by
individuals meeting the requirements of an "entry level
technician" as specified by the Air-Conditioning, Heating,
and Refrigeration Institute (AHRI). Attempting to install or
repair this unit without such background may result in
product damage, personal injury or death.

WARNING

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.

GMS80403A*BB
GMS80603A*BB
GMS80604B*BB
GMS80804B*BB
GMS80805C*BB
GMS81005C*BB
GMS81205D*BA

GMS81405DNCC

*These models available in Natural Gas and Low NOx.

WARNING

The United States Environmental Protection Agency (“EPA”) has issued various regulations regarding 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.

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

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

3

PRODUCT DESIGN
General Operation
The GMS8 furnaces are equipped with an electronic ignition
device used to light the burners and an induced draft blower
to exhaust combustion products.
An interlock switch prevents furnace operation if the inner
blower door is not in place. Keep the blower access door in
place except for inspection and maintenance. (See illustration on pages 5 and 6.)
This furnace is also equipped with a self-diagnosing electronic 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.
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 Contractors of America.
*Obtain from: American National Standards Institute 1430
Broadway New York, NY 10018
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 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 vehicles.

Notes:

WARNING
TO PREVENT POSSIBLE PERSONAL INJURY OR DEATH DUE TO ASPHYXIATION,
THIS FURNACE MUST BE CATEGORY I VENTED. DO NOT VENT USING
CATEGORY III VENTING.

Category I Venting is venting at a non-positive pressure. A
furnace vented as Category I is considered a fan-assisted
appliance and the vent system does not have to be “gas
tight.” NOTE: Single stage gas furnaces with induced draft
blowers draw products of combustion through a heat exchanger allowing, in some instances, common venting with
natural draft appliances (i.e. water heaters). All installations
must be vented in accordance with National Fuel Gas Code

4

NFPA 54/ANSI Z223.1 - latest edition. In Canada, the furnaces must be vented in accordance with the National Standard of Canada, CAN/CSA B149.1 and CAN/CSA B149.2 latest editions and amendments.
NOTE: The vertical height of the Category I venting system
must be at least as great as the horizontal length of the
venting system.
Accessibility Clearances (Minimum)
Unobstructed front clearanace of 24" for servicing is recommended.
MINIMUM CLEARANCE TO COMBUSTIBLE MATERIALS - INCHES
Sides

Rear

Front*

1

0

3

Vent
SW

B

6

1

Top
1

* 24" clearnace for serviceability recommended.
** Single Wall Vent (SW) to be used only as a conncetor.
Refer to the venting tables outlined in the Installation Manual for
additional venting requirements.

Note: In all cases accessibility clearance shall take precedence over clearances from the enclosure where accessibility clearances are greater. All dimensions are given in inches.
High Altitude Derate
IMPORTANT NOTE: The furnace as shipped requires no
change to run between 0 - 5500 feet. Do not attempt to
increase the firing rate by changing orifices or increasing
the manifold pressure below 5500 feet. This can cause poor
combustion and equipment failure.
High altitude installations above 5500 feet may require both
a pressure switch and an orifice change. These changes
are necessary to compensate for the natural reduction in
the density of both the gas fuel and the combustion air at
higher altitude.
For installations above 5500 feet, please refer to your distributor for required kit(s). Contact the distributor for a tabular listing of appropriate manufacturer’s kits for propane gas
and/or high altitude installations. The indicated kits must be
used to insure safe and proper furnace operation. All conversions must be performed by a qualified installer, or service
agency.

COMPONENT IDENTIFICATION

1 Tubular Heat Exchanger
2 Pressure Switch
3 Flue Pipe Connection
4 Induced Draft Blower
?

5 Gas Line
Entrance
6 Gas Valve
7 Rollout Limit
8 Junction Box
9 Wiring Harness
Grommet
Gas Manifold

Gas Line Entrance
(Alternate)

Inshot Burner

Transformer
Circulator Blower
Blower Door
Interlock Switch
Note: Primary Limit Not Shown

Integrated Control Module

Upflow/Horizontal
1

Tubular Heat Exchanger

9 Wiring Harness Grommet

2

Pressure Switch

10 Gas Manifold

3

Flue Pipe Connection

11 Inshot Burner

4

Induced Draft Blower

12 Transformer

5

Gas Line Entrance

13 Integrated Control Module

6

Gas Valve

14 Blower Door Interlock Swtich

7

Rollout Limit

15 Circulator Blower

8

Junction Box

16 Gas Line Entrance (Alternate)

5

PRODUCT DIMENSIONS
GMS8
Alt. Gas Inlet

Alt. Gas Inlet

Alt. High Voltage

High Voltage Inlet
Low Voltage

Alt. LowVoltage

M ODEL

A

B

14

12 - 1/2

17 - 1/2

16

21

19 - 1/2

24 - 1/2

23

GMS80403A***
GMS80603A***
GMS80604B***
GMS80804B***
GMS80805C***
GMS81005C***
GMS81205D***
GM S81405DN**

6

GMS8[040-100]BB
GMS81205D*BA

PRODUCT DIMENSIONS

GMS81405DNCC

P re ssure S w itch Trip P oints

Model

Trip Point
ID Blow er
Pressure
Sw itch

ID Blow er
Pressure
Sw itch
Part #

GM S80403A*BB

-0.70

B1370158

GM S80603A*BB

-0.75

B1370179

GM S80604B*BB

-0.75

B1370179

GM S80804B*BB

-0.70

B1370158

GM S80805C*BB

-0.75

B1370179

GM S81005C*BB

-0.70

B1370158

GM S81205D*BA

-0.80

0130F00042

GMS81405DNCC

-0.80

0130F00042

For installations in Canada, the GMS furnaces are certifed only to 4,500 ft.
* Negative pressure readings are in inches of water column (*w.c.)

P RIM ARY LIM IT
Pa r t Num ber

20162901

20 1 6 2 9 0 4

2 0 1 62 9 0 3

Open Se tting (°F)

210

150

160

GM S8 0 40 3 A* BB

1

---

---

GM S8 0 60 3 A* BB

---

1

---

GM S8 0 60 4 B* BB

---

1

---

GM S8 0 80 4 B* BB

---

1

---

GM S8 0 80 5 C* BB

---

---

1

GM S8 1 00 5 C* BB

---

1

---

GM S8 1 20 5 D* BA

---

---

1

GMS 81 4 0 5 DNCC

---

---

1

ROLLOUT LIM IT SW ITCHES

AUXILIARY LIM IT S W ITCHES
Pa r t Num be r

0 1 3 0 F00 0 3 8

Ope n Se tting (°F)

120

GM S80403A*BB

1

GM S80603A*BB

1

GM S80604B*BB

1

GM S80804B*BB

1

GM S80805C*BB

1

GM S81005C*BB

1

2

GM S81205D*BA

1

2

GMS 8 14 0 5 DNCC

1

Pa rt Num be r

1 0 1 2 3 5 29

Ope n Se tting (°F)

300

GM S 80 4 0 3 A*BB

2

GM S 80 6 0 3 A*BB

2

GM S 80 6 0 4 B*BB

2

GM S 80 8 0 4 B*BB

2

GM S 80 8 0 5 C*BB

2

GM S 81 0 0 5 C*BB

2

GM S 81 2 0 5 D*BA
GM S8 1 4 0 5 DNCC

7

PRODUCT DESIGN
Thermostats:
It is recommended that a single-stage heat, non-power robbing thermostat be used. Refer to the product marketing
literature for a complete list of thermostats offered.
THERMOSTATS

Filters:

Thermostat

Man/Auto

Programmable

Cool

Heat

Batt. Powered Batt. Bkup

1213406*

Man. Or Auto

Yes

2

3

No

No

1213407

Man. Changeover

Yes

2

2

Yes

Yes

1213411

Man. Changeover

No

2

2

Yes

No

*1213406 is the recommended model for the G*S* furnaces when used with a heat pump in a fossil fuel application.
It is NOT for use with the G*S8 as a sole heating source. 1213406 thermstats are 24V powered with battery
backup.

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

Cabinet
Width
(in.)
All

SIDE RETURN
Approx.
Nominal
Flow
Area
Filter Size
(in.)
(in2)
16 x 25 x 1
400

BOTTOM RETURN
Approx.
Cabinet
Nominal
Flow
Area
Width
Filter Size
(in.)
(in.)
(in2)
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

Refer to Minimum Filter Area tables to determine filter area requirement. NOTE: Filters can also be installed elsewhere in
the duct system such as a central return.

MINIMUM FILTER SIZES for DISPOSABLE FI LTERS
FURNACE I NPUT
40M
60M
80M
100M
120M
140M

FILTER SIZE
320 in 2
483 in 2
640 in 2
2
800 in
2
738 in
2
738 in

DISPOSABLE NOMINAL 300 F.M. FACE VELOCITY

8

GMS8[040-100]BB
GMS81205D*BA

FURNACE SPECIFICATIONS

Tem perature Rise (°F)

GMS80805C*BB

GMS81005C*BB

GMS81205D*BA

GMS81405DNCC

Rated External Static (" w.c.)

GMS80804B*BB

A.F.U.E.

GMS80604B*BB

O utput (US) High Fire

GMS80603A*BB

Btuh Input (US) High Fire

GMS80403A*BB

M O DEL

GMS81405DNCC

40,000

60,000

60,000

80,000

80,000

100,000

120,000

140,000

32,000

48,000

48,000

64,000

64,000

80,000

96,000

112,000

80%

80%

80%

80%

80%

80%

80%

80%

.20 - .50

.20 - .50

.20 - .50

.20 - .50

.20 - .50

.20 - .50

.20 - .50

.20 - .50

25 - 55

25 -55

20 - 50

35 - 65

35 - 65

35 - 65

40 - 70

40 - 70

High Stage Pressure Sw itch
Trip Point (" w .c .)

-0.70

-0.75

-0.75

-0.70

-0.75

-0.70

-0.80

-0.80

Blow er W heel (D" x W ")

10 X 6

10 x 6

10 x 8

10X8

10x10

10X10

11x10

11x10

1/3

1/3

1/2

1/2

1/2

1/2

3/4

3/4

4

4

4

4

4

4

4

4

1298

1157

1883

1725

1960

1974

2131

2131

115-60-1

115-60-1

115-60-1

115-60-1

115-60-1

115-60-1

115-60-1

115-60-1

8.5

8.5

12.9

12.9

12.9

12.9

15.2

14.7

15

15

15

15

15

15

15

15

Transform er (VA)

40

40

40

40

40

40

40

40

Heat Anticipator (Am ps)

0.7

0.7

0.7

0.7

0.7

0.7

0.7

0.7

Prim ary Lim it Setting (°F)

210°

150°

150°

150°

160°

150°

160°

160°

Auxiliary Lim it Setting (°F)

120°

120°

120°

120°

120°

120°

120°

120°

Rollout Lim it Setting (°F)

300°

300°

300°

300°

300°

300°

300°

300°

Gas Supply Pressure
(Natural/Propane) (" w.c.)

7 / 11

7 / 11

7 / 11

7 / 11

7 / 11

7 / 11

7 / 11

7 / 11

3.5 / 10

3.5 / 10

3.5 / 10

3.5 / 10

3.5 / 10

3.5 / 10

3.5 / 10

3.5 / 10

#45 / #55

#45 / #55

#45 / #55

#45 / #55

#45 / #55

#45 / #55

#45 / #55

#43 / #55

2

3

3

4

4

5

6

6

4

4

4

4

4

4

4

4

84

88

98

106

114

118

130

130

Blow er Horsepow er
Blow er Speeds
Max C FM @ 0.5 E.S.P.
Power Supply
Minim um C ircuit Am pacity (MCA)
Maxim um O vercurrent Devic e

(1)

(2)

Manifold Pressure
(Natural/Propane) High Stage (" w.c.)
O rifice Size (Natural/Propane)
Num ber of Burners
Vent Connector D iam eter (inc hes)
Shipping W eight (lbs.)

(3 )

(1)

Wire size should be determined in accordance with National Electrical Codes. Extensive wire runs will require larger wire sizes.
Maximum Overcurrent Protection Device: May use Time Delay Fuse or HACR type Circuit Breaker of the same size as noted.
(3)
See Installation Instructions for appropriate vent diameter, length and number of elbows.
(2)

1.

These furnaces are manufactured for natural gas operation. Optional Kits are available for conversion to propane gas operation.

2.

For elevations above 2000 ft. the rating should be reduced by 4% for each 1000 ft. 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 manufactures method 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, steady state efficiency times
output.

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 unit's serial plate for the most up-to-date general and electrical information.

9

GMS8[040-100]BB
GMS81205D*BA

BLOWER PERFORMANCE SPECIFICATIONS

GMS81405DNCC

(CFM & Te m pe ra ture Rise vs. Ex te rna l S ta tic P re ssure )
Model
Heating Speed
A s Shipped

EXTER N AL STATIC PR ESSUR E (Inches Water C olum n )

Ton s AC
Motor
Spe ed

at 0 .5 "

0.1

0 .2

0.3

0.4

0 .5

0 .6

0 .7

0.8

ESP

C FM R ISE C FM R ISE C FM R ISE CFM R ISE C FM R ISE C FM CFM CFM

H IGH

3 .0

1 52 1

----

146 6

----

14 14

----

1 37 3

----

129 8

----

12 43 1 164 1 07 5

*MS8 04 03A*BB

MED

2 .5

1 16 0

26

116 0

26

11 32

26

1 12 1

26

108 2

27

10 42

99 7

9 25

(MED IUM)

MED -L O

2 .0

9 61

31

9 55

31

94 8

31

9 32

32

9 13

33

88 2

82 1

8 03

L OW

1 .5

7 81

38

7 85

38

78 1

38

7 73

38

7 61

32

74 5

71 6

6 68

H IGH

3 .0

1 42 2

31

135 2

33

13 07

34

1 19 7

37

115 7

38

*MS8 06 03A*BB

MED

2 .5

1 09 8

40

108 1

41

10 51

42

1 03 9

43

102 1

44

10 92 1 075
98 3

92 4

8 68

9 83

(MED IUM)

MED -L O

2 .0

9 19

48

9 13

49

89 2

50

8 47

----

8 29

----

81 8

79 2

7 28

L OW

1 .5

7 58

----

7 41

----

74 1

----

7 33

----

6 99

----

67 7

64 9

6 26

H IGH

4 .0

2 13 4

21

210 0

21

20 42

22

1 97 5

23

188 3

24

17 86 1 700 1 60 1

*MS80 60 4B*BB

MED

3 .5

1 66 8

27

166 3

27

16 56

27

1 64 5

27

161 6

28

15 49 1 492 1 39 1

(MED IUM)

MED -L O

3 .0

1 41 9

31

142 6

31

14 26

31

1 43 2

31

141 9

31

13 78 1 328 1 26 1

L OW

2 .5

1 13 4

39

114 5

39

11 66

38

1 17 1

38

116 0

38

11 44 1 111 1 07 1

H IGH

4 .0

2 05 1

----

198 3

----

18 95

----

1 81 2

----

172 5

----

16 27 1 530 1 43 9

*MS80 80 4B*BB

MED

3 .5

1 73 6

----

170 8

35

16 52

36

1 61 1

37

154 0

38

14 75 1 394 1 30 7

(MED IUM)

MED -L O

3 .0

1 69 3

35

166 8

36

14 59

41

1 42 9

41

138 9

43

13 39 1 274 1 20 4

L OW

2 .5

1 20 0

49

118 5

50

11 80

50

1 17 3

51

115 8

51

11 25 1 125 1 08 0

H IGH

5 .0

2 29 0

----

222 9

----

21 55

----

2 04 7

----

196 0

----

18 37 1 712 1 58 4

*MS80 80 5C *BB

MED

4 .0

1 85 2

----

182 0

----

17 77

----

1 71 9

---

164 1

36

15 67 1 469 1 38 2

(MED IUM)

MED -L O

3 .5

1 61 5

37

159 2

37

15 56

38

1 51 6

39

147 0

40

14 05 1 346 1 23 5

L OW

3 .0

1 29 0

46

128 5

46

12 65

47

1 23 5

48

121 4

49

11 74 1 044

H IGH

5 .0

2 32 3

----

222 5

----

21 20

35

2 04 0

36

197 4

38

18 01 1 688 1 57 7

*MS81 00 5C *BB

MED

4 .0

1 85 8

40

184 7

40

17 99

41

1 74 4

42

167 4

44

15 77 1 493 1 39 9

(MED IUM)

MED -L O

3 .5

1 59 6

46

158 7

47

15 71

47

1 55 2

48

149 3

50

13 97 1 326 1 21 7

L OW

3 .0

1 29 1

57

127 2

58

12 61

59

1 25 7

59

120 5

61

11 68 1 118 1 06 0

H IGH

5 .0

2 46 9

----

238 9

----

23 00

----

2 22 3

40

213 1

42

20 27 1 902 1 78 6

*MS81 20 5D *BA

MED

4 .0

1 57 5

56

155 8

57

15 45

58

1 51 3

59

150 0

59

14 19 1 354 1 27 1

(MED IUM)

MED -L O

3 .5

1 40 2

63

138 0

64

13 43

66

1 31 9

67

129 6

69

12 45 1 183 1 10 6

L OW

3 .0

1 20 0

----

118 6

----

11 61

----

1 12 7

----

108 2

----

10 42

H IGH

5 .0

2 46 9

42

238 9

43

23 00

45

2 22 3

47

213 1

49

20 27 1 902 1 78 6

GMS81 40 5D N CC

MED

4 .0

1 57 5

66

155 8

67

15 45

67

1 51 3

69

150 0

69

14 19 1 354 1 27 1

(MED IUM)

MED -L O

3 .5

1 40 2

----

138 0

----

13 43

----

1 31 9

----

129 6

----

12 45 1 183 1 10 6

L OW

3 .0

1 20 0

----

118 6

----

11 61

----

1 12 7

----

108 2

----

10 42

99 5

99 5

9 04

9 26

9 26

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 hig-speed cooling. Installer must adjust blower cooling 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 must not exceed values shown on the rating plate. The shaded area insicated
ranges in excess of maximum static pressure allowed when heating.

•

The dashed (---) areas indicate a temperature rise not recommended for this model.

•

At higher altitudes, a properly de-rated unit will have approximatley the same temperature rise at a particular CFM, while ESP at the CFM will be lower.

10

TEMPERATURE RISE

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 =

BTU OUTPUT vs TEMPERATURE RISE CHART

150

BLOWER PERFORMANCE SPECIFICATIONS

11

WIRING DIAGRAMS

GMS8

WARNING:DISCONNECT POWER BEFORE
SERVICING.WIRING TO UNIT MUST BE
PROPERLY POLARIZED AND GROUNDED.

INTEGRATED
CONTROL MODULE

HUMIDIFIER
XFMR (6)

24 VAC
HUMIDIFIER

GND

GND (8)
C

C2 GAS
VALVE

MVC (9)

R W Y

G

M1

1

6

5

4

9

8

7

12

11

10

YL
RD
YL

BL

BR

RD
GR

RD

2

AUXILI ARY
LIMITS
11 5 VAC NEUTRAL

INTEGRATED
CONTROL MODULE

G

PS (10)

HLI (7)

W
HLO (1)
AUTO RESET
PRIMARY
LIMIT
CONTROL

R
RO2 (11)
RO1 (5)
MANUAL RESET ROLLOUT
LIMIT CONTROL(S)
(SINGLE CONTROL ON SOME MODELS)
24 VAC

40 VA
TRANSFORMER

BR
XFMR-H

YL

OR

1

115 VAC

YL

RD

FP (2)
HOT SURFACE
IGNITER
IGN-N

ID
BLWR

IND

IND-N
COOL-H
CO
OL

CIRCULATOR
BLWR
AT
HE

CAP

YL

WH

HEAT-H

WH

GR

15 PIN PLUG
ON SOME MODELS
BLOWER COMPARTMENT

LINE-N

LINE-H
JUNCTION BOX

BURNER COMPARTMENT

C

PRESSURE
SWITCH

WH

BK

PRIMARY LIMIT

NO

YL

OR

RD

DOOR
SWI TCH

24 VAC
HUMIDIFIER

BK

DOOR SWITCH
SWITCH LOCATED IN BLOWER
COMPARTMENT ON SOME MODELS
RD

CIR-N

INTEGRATED CONTROL MODULE

WH

BR
BR

YL

RD

XFMR

INTEGRATED CONTROL MODULE

BR

WH

115V

CICULATOR BLOWER

OR

BK
BK

IGN

BK (HI)
BL (MED)
OR (MED LOW)
RD (LOW)
WH (N)

WH

BK
24V

XFMR-N

FLAME SENSOR

WH

PU

BK

PU

115 VAC HOT AND PARK TERMINALS
LINE-H
XFMR-H
HEAT-H
COOL-H

NO

C

PSO (4)

TO
MICRO

Y

XFMR (3)

BL

YL

WH
WH

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.

24V THERMOSTAT CONNECTIONS

2

ID BLOWER
PRESSURE
SWITCH

AUXILIARY
LIMIT CONTROLS

OR

3

MV (12)

C

DIAGNOSTIC
LED

FUSE

WARNING:
DISCONNECT POWER
BEFORE SERVICING.
WIRING TO UNIT
MUST BE
PROPERLY
POLARIZED
AND GROUNDED.

BK

DISCONNECT

N
L
GND
1 Ø /60 HZ POWER SUPPLY WITH
OVERCURRENT PROTECTION DEVICE

TO 115VAC/

BR
BL
OR
BK

M1

HOT
SURFACE
IGNITER

JUNCTION
BOX

WH

C2
FLAME
SENSOR

GAS VALVE

LINE-N
GND
LINE H

PU
INDUCED DRAFT
BLOWER
PU

PU
ROLLOUT LIMITS
(SINGLE CONTROL ON SOME MODELS)

0

1
2

STEADY ON

= NORMAL OPERATION

OFF

= CONTROL FAILURE

1 FLASH

= SYSTEM LOCKOUT (RETRIES/RECYCLES EXCEEDED)

2 FLASHES

= PRESSURE SWITCH STUCK CLOSED

3

3 FLASHES

= PRESSURE SWITCH STUCK OPEN

4

4 FLASHES

= OPEN HIGH LIMIT

5

5 FLASHES

= FLAME SENSE WITHOUT GAS VALVE

6

6 FLASHES

= OPEN ROLLOUT

7

7 FLASHES

= LOW FLAME SIGNAL

C

RAPID FLASHES = REVERSED 115 VAC POLARITY/VERIFY GND

COLOR CODES:
YL YELLOW
OR ORANGE
PU PURPLE
GR GREEN
BK BLACK

PK PINK
BR BROWN
W H WHITE
BL BLUE
GY GRAY
RD RED

TO 115 VAC/ 1/60HZ
POWER SUPPLY WITH
OVERCURRENT PROTECTION
DEVICE

LOW VOLTAGE (24V)
LOW VOLTAGE FIELD
HI VOLTAGE (115V)

EQUIPMENT GND
FIELD GND
FIELD SPLICE

HI VOLTAGE FIELD
SWITCH (TEMP.)
JUNCTION
TERMINAL
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 W HEN SERVICING.
3. IF ANY OF THE ORIGINAL WIRE AS SUPPLIED WITH THE FURNACE MUST BE
REPLACED, IT MUST BE REPLACED W ITH W IRING MATERIAL HAVING A TEMPERATURE
RATING OF AT LEAST 105 C. USE COPPER CONDUCTORS ONLY.
4. BLOWER SPEEDS MUST 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.

0140F00119-C

Wiring is subject to change, always refer to the wiring diagram on the unit for the most up-to-date wiring.

12

SCHEMATICS

GMS8
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.

CIRCULATOR
BLOWER
INDUCER

CIR
PARK PARK NEU

HEAT COOL

IND
R

K2

RO2
RO1
TH

K3
K1

ROLLOUT
SWITCH

XFMR
HOT
24 VAC
.0005
FACTORY
JUMPER

3M
K5

K8
FACTORY
JUMPER

FP

IGN

GND

MV

MV

FLAME
SENSOR
PROBE
IGNITOR

GAS
VALVE

PS

HLO

HIGH
LIMIT

HLI

PSO

XFMR
NEU
TR
C

COMPRESSOR
CONTACTOR
COIL

Y
G
W

Y
G
W

R

THERMOSTAT

AUX
LIMIT

PRESSURE
SWITCH

TYPICAL SCHEMATIC
GMS8 * MODEL FURNACES
WR 50T55-289 INTEGRATED IGNITION CONTROL

This schematic is for reference only. Not all wiring is as shown above. Always refer to the appropriate wiring diagram for the unit being serviced.

13



---

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