Goodman Mfg Furnace GMS8 33 3 8 GAS FURNACE UNITS User Manual

TECHNICAL 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.  
RT6621031r2  
November 2013  
Copyright © 2013 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.  
GMS81405DNCC  
GMS80403A*BB  
GMS80603A*BB  
GMS80604B*BB  
GMS80804B*BB  
GMS80805C*BB  
GMS81005C*BB  
GMS81205D*BA  
*These models available in Natural Gas and Low NOx.  
The United States Environmental Protection Agency (“EPA”) has issued various regulations re-  
garding the introduction and disposal of refrigerants introduced into this unit. Failure to follow  
these regulations may harm the environment and can lead to the imposition of substantial fines.  
These regulations may vary by jurisdiction. Should questions arise, contact your local EPA office.  
WARNING  
WARNING  
Do not connect or use any device  
To prevent the risk of property  
WARNING  
thatisnotdesigncertifiedbyGood-  
damage, personal injury, or death,  
man for use with this unit. Serious  
do not store combustible materials or use gasoline or  
property damage, personal injury, reduced unit perfor-  
mance and/or hazardous conditions may result from the  
use of such non-approved devices.  
other flammable liquids or vapors in the vicinity of this  
appliance.  
3
 
PRODUCT DESIGN  
General Operation  
NFPA 54/ANSI Z223.1 - latest edition. In Canada, the fur-  
naces must be vented in accordance with the National Stan-  
dard of Canada, CAN/CSA B149.1 and CAN/CSA B149.2 -  
latest editions and amendments.  
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 illustra-  
tion on pages 5 and 6.)  
NOTE: The vertical height of the Category I venting system  
must be at least as great as the horizontal length of the  
venting system.  
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)  
Unobstructed front clearanace of 24" for servicing is rec-  
ommended.  
MINIMUM CLEARANCE TO COMBUSTIBLE MATERIALS - INCHES  
Vent  
Sides  
1
Rear  
0
Front*  
3
Top  
1
SW  
6
B
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.  
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.  
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  
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.  
Location Considerations  
The furnace should be as centralized as is practical  
with respect to the air distribution system.  
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.  
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 ve-  
hicles.  
For installations above 5500 feet, please refer to your dis-  
tributor for required kit(s). Contact the distributor for a tabu-  
lar 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 conver-  
sions must be performed by a qualified installer, or service  
agency.  
Notes:  
WARNING  
O PREVENT POSSIBLE PERSONAL INJURY OR DEATH DUE TO ASPHYXIATION,  
T
THIS FURNACE MUST BE ATEGORY VENTED.  
O NOT VENT USING  
D
C
I
ATEGORY  
C
VENTING.  
III  
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 ex-  
changer 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
 
COMPONENT IDENTIFICATION  
Tubular Heat Exchanger  
1
2 Pressure Switch  
3
Flue Pipe Connection  
Induced Draft Blower  
4
?
Gas Line  
Entrance  
5
6
Gas Valve  
7
Rollout Limit  
8
Junction Box  
Wiring Harness  
Grommet  
9
Gas Manifold  
Inshot Burner  
Gas Line Entrance  
(Alternate)  
Transformer  
Circulator Blower  
Blower Door  
Interlock Switch  
Note: Primary Limit Not Shown  
Integrated Control Module  
Upflow/Horizontal  
1
2
3
4
5
6
7
8
Tubular Heat Exchanger  
9 Wiring Harness Grommet  
Pressure Switch  
Flue Pipe Connection  
Induced Draft Blower  
Gas Line Entrance  
Gas Valve  
10 Gas Manifold  
11 Inshot Burner  
12 Transformer  
13 Integrated Control Module  
14 Blower Door Interlock Swtich  
15 Circulator Blower  
Rollout Limit  
Junction Box  
16 Gas Line Entrance (Alternate)  
5
 
PRODUCT DIMENSIONS  
GMS8  
Alt. Gas Inlet  
Alt. Gas Inlet  
Alt. High Voltage  
Alt. LowVoltage  
High Voltage Inlet  
Low Voltage  
MODEL  
A
B
GMS80403A***  
GMS80603A***  
GMS80604B***  
GMS80804B***  
GMS80805C***  
GMS81005C***  
14  
12 - 1/2  
17 - 1/2  
16  
21  
19 - 1/2  
23  
GMS81205D***  
GMS81405DN**  
24 - 1/2  
6
 
GMS8[040-100]BB  
GMS81205D*BA  
GMS81405DNCC  
PRODUCT DIMENSIONS  
Pressure Switch Trip Points  
Trip Point  
ID Blower  
Pressure  
Sw itch  
ID Blower  
Pressure  
Sw itch  
Model  
Part #  
-0.70  
-0.75  
-0.75  
-0.70  
-0.75  
-0.70  
-0.80  
-0.80  
B1370158  
B1370179  
B1370179  
B1370158  
B1370179  
B1370158  
0130F00042  
0130F00042  
GMS80403A*BB  
GMS80603A*BB  
GMS80604B*BB  
GMS80804B*BB  
GMS80805C*BB  
GMS81005C*BB  
GMS81205D*BA  
GMS81405DNCC  
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.)  
PRIMARY LIMIT  
Part Number  
Open Setting (°F)  
GMS80403A*BB  
GMS80603A*BB  
GMS80604B*BB  
GMS80804B*BB  
GMS80805C*BB  
GMS81005C*BB  
20162901  
20162904  
20162903  
210  
1
150  
---  
1
160  
---  
---  
---  
---  
1
---  
---  
---  
---  
---  
1
1
---  
1
---  
GMS81205D*BA  
GMS81405DNCC  
---  
---  
---  
---  
1
1
AUXILIARY LIMIT SWITCHES  
ROLLOUT LIMIT SW ITCHES  
Part Number  
Open Setting F)  
GMS80403A*BB  
GMS80603A*BB  
GMS80604B*BB  
GMS80804B*BB  
GMS80805C*BB  
GMS81005C*BB  
0130F00038  
Part Number  
Open Setting F)  
GMS80403A*BB  
GMS80603A*BB  
GMS80604B*BB  
GMS80804B*BB  
GMS80805C*BB  
GMS81005C*BB  
10123529  
120  
1
300  
2
1
2
1
2
1
2
1
2
1
2
GMS81205D*BA  
GMS81405DNCC  
1
1
GMS81205D*BA  
GMS81405DNCC  
2
2
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  
Thermostat  
Man/Auto  
Programmable  
Cool Heat Batt. Powered Batt. Bkup  
1213406*  
1213407  
1213411  
Man. Or Auto  
Man. Changeover  
Man. Changeover  
Yes  
Yes  
No  
2
2
2
3
2
2
No  
Yes  
Yes  
No  
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:  
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  
SIDE RETURN  
Nominal  
BOTTOM RETURN  
Approx.  
Approx.  
Cabinet  
Width  
(in.)  
Cabinet  
Width  
(in.)  
Nominal  
Filter Size  
(in.)  
Flow Area  
Flow Area  
(in2)  
Filter Size  
(in.)  
(in2)  
All  
16 x 25 x 1  
400  
17-1/2  
21  
14 x 25 x 1  
16 x 25 x 1  
20 x 25 x 1  
350  
400  
24-1/2  
500  
RefertoMinimumFilterAreatablestodeterminefilterarearequirement.NOTE: Filterscanalsobeinstalledelsewherein  
the duct system such as a central return.  
MINIMUM FILTER SIZES for DISPOSABLE FILTERS  
FURNACE INPUT  
FILTER SIZE  
320 in2  
40M  
60M  
483 in2  
80M  
100M  
120M  
140M  
640 in2  
800 in2  
738 in2  
738 in2  
DISPOSABLE NOMINAL 300 F.M. FACE VELOCITY  
8
 
GMS8[040-100]BB  
GMS81205D*BA  
GMS81405DNCC  
FURNACE SPECIFICATIONS  
MODEL  
Btuh Input (US) High Fire  
Output (US) High Fire  
A.F.U.E.  
40,000  
32,000  
80%  
60,000  
48,000  
80%  
60,000  
48,000  
80%  
80,000  
64,000  
80%  
80,000  
64,000  
80%  
100,000  
80,000  
80%  
120,000  
96,000  
80%  
140,000  
112,000  
80%  
Rated External Static (" w.c.)  
Temperature Rise (°F)  
.20 - .50  
25 - 55  
.20 - .50  
25 -55  
.20 - .50  
20 - 50  
.20 - .50  
35 - 65  
.20 - .50  
35 - 65  
.20 - .50  
35 - 65  
.20 - .50  
40 - 70  
.20 - .50  
40 - 70  
High Stage Pressure Switch  
Trip Point (" w.c.)  
-0.70  
-0.75  
-0.75  
-0.70  
-0.75  
-0.70  
-0.80  
-0.80  
Blower Wheel (D" x W")  
Blower Horsepower  
10 X 6  
1/3  
10 x 6  
1/3  
10 x 8  
1/2  
10X8  
1/2  
10x10  
1/2  
10X10  
1/2  
11x10  
3/4  
11x10  
3/4  
Blower Speeds  
4
4
4
4
4
4
4
4
Max CFM @ 0.5 E.S.P.  
Power Supply  
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  
Minimum Circuit Ampacity (MCA)(1)  
Maximum Overcurrent Device(2)  
Transformer (VA)  
8.5  
15  
8.5  
15  
12.9  
15  
12.9  
15  
12.9  
15  
12.9  
15  
15.2  
15  
14.7  
15  
40  
40  
40  
40  
40  
40  
40  
40  
Heat Anticipator (Amps)  
Primary Limit Setting (°F)  
Auxiliary Limit Setting (°F)  
Rollout Limit Setting (°F)  
0.7  
0.7  
0.7  
0.7  
0.7  
0.7  
0.7  
0.7  
210°  
120°  
300°  
150°  
120°  
300°  
150°  
120°  
300°  
150°  
120°  
300°  
160°  
120°  
300°  
150°  
120°  
300°  
160°  
120°  
300°  
160°  
120°  
300°  
Gas Supply Pressure  
7 / 11  
7 / 11  
7 / 11  
7 / 11  
7 / 11  
7 / 11  
7 / 11  
7 / 11  
(Natural/Propane) (" w.c.)  
Manifold Pressure  
3.5 / 10  
3.5 / 10  
3.5 / 10  
3.5 / 10  
3.5 / 10  
3.5 / 10  
3.5 / 10  
3.5 / 10  
(Natural/Propane) High Stage (" w.c.)  
Orifice Size (Natural/Propane)  
Number of Burners  
#45 / #55 #45 / #55 #45 / #55 #45 / #55 #45 / #55 #45 / #55 #45 / #55 #43 / #55  
2
4
3
4
3
4
4
4
4
4
5
4
6
4
6
4
Vent Connector Diameter (inches)(3)  
Shipping Weight (lbs.)  
84  
88  
98  
106  
114  
118  
130  
130  
(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) See Installation Instructions for appropriate vent diameter, length and number of elbows.  
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  
GMS81405DNCC  
BLOWER PERFORMANCE SPECIFICATIONS  
(CFM & Temperature Rise vs. External Static Pressure)  
Model  
EXTERNAL STATIC PRESSURE (Inches Water Colum n)  
0.2 0.3 0.4 0.5  
Tons AC  
at 0.5"  
ESP  
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  
5.0  
4.0  
3.5  
3.0  
5.0  
4.0  
3.5  
3.0  
Motor  
Speed  
0.1  
0.6  
0.7  
0.8  
Heating Speed  
As Shipped  
CFM RISE CFM RISE CFM RISE CFM RISE CFM RISE CFM CFM CFM  
1521 ---- 1466 ---- 1414 ---- 1373 ---- 1298 ---- 1243 1164 1075  
1160 26 1160 26 1132 26 1121 26 1082 27 1042 997 925  
HIGH  
MED  
*MS80403A*BB  
(MEDIUM)  
MED-LO  
LOW  
961  
781  
31  
38  
955  
785  
31  
38  
948  
781  
31  
38  
932  
773  
32  
38  
913  
761  
33  
32  
882 821 803  
745 716 668  
HIGH  
MED  
1422 31 1352 33 1307 34 1197 37 1157 38 1092 1075 983  
*MS80603A*BB  
(MEDIUM)  
1098 40 1081 41 1051 42 1039 43 1021 44  
983 924 868  
818 792 728  
677 649 626  
MED-LO  
LOW  
919  
758  
48  
913  
741  
49  
892  
741  
50  
847  
733  
----  
----  
829  
699  
----  
----  
----  
----  
----  
HIGH  
MED  
2134 21 2100 21 2042 22 1975 23 1883 24 1786 1700 1601  
1668 27 1663 27 1656 27 1645 27 1616 28 1549 1492 1391  
1419 31 1426 31 1426 31 1432 31 1419 31 1378 1328 1261  
1134 39 1145 39 1166 38 1171 38 1160 38 1144 1111 1071  
2051 ---- 1983 ---- 1895 ---- 1812 ---- 1725 ---- 1627 1530 1439  
1736 ---- 1708 35 1652 36 1611 37 1540 38 1475 1394 1307  
1693 35 1668 36 1459 41 1429 41 1389 43 1339 1274 1204  
1200 49 1185 50 1180 50 1173 51 1158 51 1125 1125 1080  
2290 ---- 2229 ---- 2155 ---- 2047 ---- 1960 ---- 1837 1712 1584  
1852 ---- 1820 ---- 1777 ---- 1719 --- 1641 36 1567 1469 1382  
1615 37 1592 37 1556 38 1516 39 1470 40 1405 1346 1235  
1290 46 1285 46 1265 47 1235 48 1214 49 1174 1044 904  
2323 ---- 2225 ---- 2120 35 2040 36 1974 38 1801 1688 1577  
1858 40 1847 40 1799 41 1744 42 1674 44 1577 1493 1399  
1596 46 1587 47 1571 47 1552 48 1493 50 1397 1326 1217  
1291 57 1272 58 1261 59 1257 59 1205 61 1168 1118 1060  
2469 ---- 2389 ---- 2300 ---- 2223 40 2131 42 2027 1902 1786  
1575 56 1558 57 1545 58 1513 59 1500 59 1419 1354 1271  
1402 63 1380 64 1343 66 1319 67 1296 69 1245 1183 1106  
1200 ---- 1186 ---- 1161 ---- 1127 ---- 1082 ---- 1042 995 926  
2469 42 2389 43 2300 45 2223 47 2131 49 2027 1902 1786  
1575 66 1558 67 1545 67 1513 69 1500 69 1419 1354 1271  
1402 ---- 1380 ---- 1343 ---- 1319 ---- 1296 ---- 1245 1183 1106  
1200 ---- 1186 ---- 1161 ---- 1127 ---- 1082 ---- 1042 995 926  
*MS80604B*BB  
(MEDIUM)  
MED-LO  
LOW  
HIGH  
*MS80804B*BB  
(MEDIUM)  
MED  
MED-LO  
LOW  
HIGH  
*MS80805C*BB  
(MEDIUM)  
MED  
MED-LO  
LOW  
HIGH  
MED  
*MS81005C*BB  
(MEDIUM)  
MED-LO  
LOW  
HIGH  
*MS81205D*BA  
(MEDIUM)  
MED  
MED-LO  
LOW  
HIGH  
MED  
GMS81405DNCC  
(MEDIUM)  
MED-LO  
LOW  
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  
 
BLOWER PERFORMANCE SPECIFICATIONS  
E I S E T U P E T E  
11  
 
WIRING DIAGRAMS  
GMS8  
INTEGRATED  
CONTROLMODULE  
HUMIDIFIER  
XFMR (6)  
WARNING:DISCONNECT POWER BEFORE  
SERVICING.WIRING TO UNIT MUST BE  
PROPERLY POLARIZED AND GROUNDED.  
GND  
24 VAC  
HUMIDIFIER  
GND (8)  
MVC (9)  
GAS  
VALVE  
C2  
W
C
G
R
Y
M1  
MV (12)  
C
DIAGNOSTIC  
LED  
ID BLOWER  
PRESSURE  
SWITCH  
AUXILIARY  
LIMITCONTROLS  
FUSE  
OR  
G
Y
NO  
PS (10)  
PSO (4)  
HLI (7)  
C
3
2
1
4
TO  
MICRO  
6
9
5
8
YL  
W
HLO (1)  
7
RD  
AUTO RESET  
PRIMARY  
LIMIT  
12  
10  
11  
YL  
R
RO2 (11)  
RO1 (5)  
BR  
CONTROL  
AUXILI ARY  
LIMITS  
INTEGRATED  
CONTROLMODULE  
MANUAL RES ET ROLLOUT  
LIMITCONTROL(S)  
(SINGLE CONTROL ON SOME MODELS)  
24 VAC  
XFMR (3)  
40VA  
TRANSFORMER  
2
BR  
1
XFMR-H  
FP (2)  
115 VAC  
XFMR-N  
FLAME SENSOR  
HOT SURFACE  
IGNITER  
IGN  
IGN-N  
115 VAC HOT AND PARK TERMINALS  
LINE-H XFMR-H HEAT-H COOL-H  
ID  
BLWR  
IND  
IND-N  
CIR-N  
COOL-H  
24V  
BK  
BK  
CIRCULATOR  
BLWR  
115V  
XFMR  
WH  
HEAT-H  
15 PIN PLUG  
ON SOME MODELS  
BLOWER COMPARTMENT  
LINE-N  
LINE-H  
DOOR  
JUNCTIONBOX  
BURNER COMPARTMENT  
24 VAC  
HUMIDIFIER  
DOOR SWITCH  
SWITCH  
SWITCH LOCATED INBLOWER  
COMPARTMENT ON SOME MODELS  
NO  
C
YL  
WARNING:  
RD  
RD  
DISCONNECT POWER  
BEFORE SERVICING.  
WIRING TO UNIT  
MUST BE  
DISCONNECT  
PRESSURE  
SWITCH  
YL  
PRIMARY LIMIT  
PROPERLY  
POLARIZED  
AND GROUNDED.  
WH  
BK  
L
GND  
N
TO 115VAC/  
1
BR  
Ø /60 HZ POWER SUPPLY WITH  
BL  
OVERCURRENT PROTECTION DEVICE  
OR  
BK  
JUNCTION  
BOX  
C2  
HOT  
SURFACE  
IGNITER  
M1  
FLAME  
SENSOR  
LINE-N  
GND  
GAS VALVE  
LINE H  
PU  
INDUCED DRAFT  
BLOWER  
TO 115 VAC/ 1/60HZ  
POWERSUPPLY WITH  
OVERCURRENT PROTECTION  
DEVICE  
PU  
PU  
ROLLOUT LIMITS  
(SINGLE CO NTROL ON SOME MODELS)  
0
STEADY ON  
= NORMAL OPERATION  
= CONTROL FAILURE  
LOW VOLTAGE (24V)  
LOW VOLTAGE FIELD  
HI VOLTAGE (115V)  
HI VOLTAGE FIELD  
JUNCTION  
EQUIPMENT GND  
FIELD GND  
OFF  
1
2
3
4
5
6
7
C
1 FLASH  
= SYSTEM LOCKOUT (RETRIES/RECYCLES EXCEEDED)  
= PRESSURE SWITCH STUCK CLOSED  
2 FLASHES  
FIELD SPLICE  
SWITCH (TEMP.)  
IGNITER  
3 FLASHES  
4 FLASHES  
5 FLASHES  
= PRESSURE SWITCH STUCK OPEN  
= OPEN HIGH LIMIT  
= FLAME SENSE WITHOUT GAS VALVE  
TERMINAL  
6 FLASHES  
7 FLASHES  
= OPEN ROLLOUT  
SWITCH (PRESS.)  
INTERNAL TO  
INTEGRATED CONTROL  
= LOW FLAME SIGNAL  
OVERCURRENT  
PROT. DEVICE  
RAPID FLASHES = REVERSED 115 VAC POLARITY/VERIFY GND  
PLUG CONNECTION  
NOTES:  
PK PINK  
COLOR CODES:  
YL YELLOW  
OR ORANGE  
PU PURPLE  
GR GREEN  
1. SET HEAT ANTICIPATOR ON ROOM THERMOSTAT AT 0.7 AMPS.  
BR BROWN  
WH WHITE  
BL BLUE  
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 MUST BEADJUSTED BY INSTALLER TO MATCH THE INSTALLATION  
REQUIREMENTS SOAS TO PROVIDE THE CORRECT HEATING TEMPERATURE RISE AND THE  
CORRECT COOLING CFM. (SEE SPEC SHEET FOR AIR FLOW CHART)  
GY GRAY  
RD RED  
BK BLACK  
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  
NEU  
HEAT COOL  
K2  
PARK PARK  
IND  
R
RO2  
RO1  
UT  
ROLLO  
SWITCH  
K3  
TH  
K1  
XFMR  
HOT  
24 VAC  
XFMR  
NEU  
.0005  
3M  
COMPRESSOR  
CONTACTOR  
COIL  
TR  
C
FACTORY  
JUMPER  
K8  
R
K5  
FACTORY  
JUMPER  
Y
G
W
Y
G
W
GND  
IGN  
PS  
MV MV  
HLI  
HLO  
FP  
PSO  
THERMOSTAT  
FLAME  
SENSOR  
PROBE  
AUX  
LIMIT  
HIGH  
LIMIT  
GAS  
VALVE  
IGNITOR  
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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