Goodman Mfg Gas Heater GDS8 User Manual

TECHNICAL MANUAL  
GDS8 & GHS8  
33-3/8" 80% Gas Furnace Units  
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.  
RT6622011  
September2009  
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.  
Copyright © 2009 Goodman Manufacturing Company, L.P.  
Copyright © 2005-2007 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.  
GDS80453AXC*  
GDS80703AXC*  
GDS80904BXC*  
GDS81155CXC*  
GHS80453AXC*  
GHS80704AXC*  
GHS81155CXC*  
* These models available in 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  
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  
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 G*S8 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- Accessibility Clearances (Minimum)  
tronic control module. In the event a furnace component is  
Unobstructed front clearance of 24" for servicing is recom-  
mended.  
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.  
MINIMUM CLEARANCE TO COMBUSTIBLE MATERIALS - INCHES  
Vent  
Sides  
1
Rear  
0
Front*  
3
Top  
1
SW  
6
B
1
*
24" clearance for serviceability recommended.  
** Single Wall Vent (SW) to be used only as a connector.  
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  
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.  
INPUT PER BURNER  
-
22,500 BTUH NATURAL GAS / 20,000 BTUH L.P.  
ELEVATION ABOVE SEA-LEVEL (FEET)  
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.  
2000  
3000  
4000  
4500  
5000  
6000  
7000  
8000  
US BURNER  
ORIFICE  
44/55  
44/55  
44/55  
45/56  
45/56  
46/57  
47/58  
47/58  
CANADA BURNER  
ORIFICE  
47/57  
HA-02 HIGH ALTITUDE CONVERSION KIT REQUIRED  
Notes:  
Tabled data is based upon the furnace input being reduced for altitudes above sea level. U.S. 4% per 1,000 feet.  
Canada 10% derate for 2,000-4,000 feet.  
WARNING  
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.  
O PREVENT POSSIBLE PERSONAL INJURY OR DEATH DUE TO ASPHYXIATION,  
T
THIS FURNACE MUST BE ATEGORY VENTED.  
O NOT VENT USING  
D
C
I
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 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
 
PRODUCT DIMENSIONS  
MODEL  
A
B
14 1/2"  
17 1/2"  
21"  
12 1/2"  
16"  
GHS80453AXC*  
GHS80704BXC*  
GHS80905CXC*  
19 1/2"  
MODEL  
A
B
GDS80453AXC*  
GDS80703AXC*  
GDS80904BXC*  
GDS81155CXC*  
14 1/2"  
12 1/2"  
17 1/2"  
21"  
16"  
19 1/2"  
5
 
PRODUCT DESIGN  
GHS8  
Pressure Switch Trip Points  
And Usage Chart  
Trip Point  
ID Blower  
Pressure  
Switch  
ID Blower  
Pressure  
Switch  
Part #  
Model  
-0.80  
-0.70  
-0.70  
0130F00042  
B1370158  
B1370158  
GHS80453AXC*  
GHS80704BXC*  
GHS80905CXC*  
For installations in Canada, the GHS furances are certified only to 4,500 ft.  
* Negative pressure readings are in inches of water column (*w.c.)  
PRIMARY LIMIT  
Part Number  
Open Setting (°F)  
GHS80453AXC*  
GHS80704BXC*  
GHS80905CXC*  
0130M00063  
20162903  
140  
1
120  
---  
1
---  
1
---  
ROLLOUT LIMIT SWITCHES  
AUXILIARY LIMIT SWITCHES  
Part Number  
Open Setting (°F)  
GHS80453AXC*  
GHS80704BXC*  
GHS80905CXC*  
B1370145  
Part Number  
Open Setting (°F)  
GHS80453AXC*  
GHS80704BXC*  
GHS80905CXC*  
0130F00038  
300  
2
120  
1
2
1
2
1
6
 
PRODUCT DESIGN  
GDS8  
Presssure Switches  
Part No.  
Model  
Opens*  
-0.60  
B1370142  
B137158  
B1370142  
B137158  
GDS80453AXC*  
GDS80703AXC*  
GDS80904BXC*  
GDS81155CXC*  
-0.70  
-0.60  
-0.70  
PRIMARY LIMIT  
0130F00035  
Part Number  
Open Setting (°F)  
GDS80453AXC*  
GDS80703AXC*  
GDS80904BXC*  
GDS81155CXC*  
0130F00036  
220  
1
180  
---  
---  
1
1
---  
---  
1
ROLLOUT LIMIT SWITCHES  
AUXILIARY LIMIT SWITCHES  
Part Number  
Open Setting (°F)  
GDS80453AXC*  
GDS80703AXC*  
GDS80904BXC*  
GDS81155CXC*  
B1370145  
Part Number  
Open Setting (°F)  
GDS80453AXC*  
GDS80703AXC*  
GDS80904BXC*  
GDS81155CXC*  
0130F00038  
300  
2
120  
1
2
1
2
1
2
1
7
 
PRODUCT DESIGN  
Coil Matches:  
A large array of Amana® brand coils are available for use with the GHS8 furnaces, in horizontal applications and for the  
GDS8 for downflow applications. These coils are available in both cased and uncased models (with the option of a field  
installed TXV expansion device). These 80% furnaces match up with the existing Amana® brand coils as shown 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 Slab Coils)  
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 AHRI rated with a matched outdoor unit.  
8
 
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:  
SIDE RETURN  
Nominal  
Filter Size  
(in.)  
BOTTOM RETURN  
Approx.  
Flow Area  
(in2)  
Approx.  
Cabinet  
Width  
(in.)  
Cabinet  
Width  
(in.)  
Nominal  
Filter Size  
(in.)  
Flow Area  
(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.  
UPFLOW  
UPFLOW  
COOLING AIRFLOW REQUIREMENT (CFM)  
COOLING AIRFLOW REQUIREMENT (CFM)  
600  
---  
800  
---  
1000 1200  
1400  
672  
1600  
768  
2000  
600  
---  
800  
---  
1000 1200  
1400  
672  
1600  
768  
2000  
---  
0704__XA  
0905__XA  
1155__XA  
564*  
---  
564*  
752*  
940*  
0704__XA  
0905__XA  
1155__XA  
627*  
---  
627*  
836*  
940*  
---  
---  
752*  
940*  
768  
960  
960  
---  
---  
836*  
940*  
836*  
940*  
960  
960  
---  
---  
---  
940*  
---  
---  
---  
COUNTERFLOW  
COOLING AIRFLOW REQUIREMENT (CFM)  
COUNTERFLOW  
COOLING AIRFLOW REQUIREMENT (CFM)  
600  
---  
800  
---  
1000 1200  
1400  
336  
1600  
384  
2000  
---  
600  
---  
800  
---  
1000 1200  
1400  
672  
1600  
768  
2000  
---  
0704__XA  
0905__XA  
320*  
---  
320*  
427*  
0704__XA  
0905__XA  
641*  
---  
641*  
854*  
---  
---  
427*  
427*  
480  
---  
---  
854*  
854*  
960  
*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]  
9
 
PRODUCT DESIGN  
Counterflow Filters  
Thisfurnacehasprovisionsfortheinstallationofreturnairfiltersatthecounterflowtopreturn. Thefurnacewillaccommodate  
the following filter sizes depending on cabinet size:  
Counterflow Top Return  
Return Air  
Filter Size Dimension "A"  
Filter Area  
(in2)  
Optional  
Access  
Door  
Cabinet Width  
Qty  
(in)  
(in)  
"A"  
Min  
21  
24 1/2  
21  
24 1/2  
21  
13.0  
11.3  
18.8  
17.7  
24.3  
23.4  
600  
800  
2
2
2
15 X 20 X 1  
20 X 20 X 1  
25 X 20 X 1  
1000  
24 1/2  
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.  
10  
 
FURNACE SPECIFICATIONS  
GDS8  
MODEL  
GDS80453AXC* GDS80703AXC* GDS80904BXC* GDS81155CXC*  
Btuh Input (US) High Fire(1)  
45,000  
36,000  
80%  
70,000  
56,000  
80%  
90,000  
72,000  
80%  
115,000  
92,000  
80%  
Output (US) High Fire(1)  
A.F.U.E.(2)  
Rated External Static (" w.c.)  
Temperature Rise (°F)  
.20 - .50  
35-65  
.20 - .50  
30-60  
.20 - .50  
35-65  
.20 - .50  
40 - 70  
Pressure Switch Trip Point (" w.c.)  
-0.60  
-0.70  
-0.60  
-0.70  
Blower Wheel (D" x W")  
Blower Horsepower  
Blower Speeds  
10 X 6  
1/3  
10 x 6  
1/3  
10 x 8  
1/2  
10 x 10  
3/4  
Refer toairflow charts.  
Max CFM @ 0.5 E.S.P.  
Power Supply  
115-60-1  
8.5  
115-60-1  
8.5  
115-60-1  
12.9  
15  
115-60-1  
12.9  
15  
Minimum Circuit Ampacity (MCA)(4)  
Maximum Overcurrent Device(5)  
Transformer (VA)  
15  
15  
40  
40  
40  
40  
Heat Anticipator (Amps)  
0.7  
0.7  
0.7  
0.7  
Primary Limit Setting (°F)  
220  
220  
180  
180  
Auxiliary Limit Setting (°F)  
120  
120  
120  
120  
Rollout Limit Setting (°F)  
300  
300  
300  
300  
Gas Supply Pressure (Natural/Propane) (" w.c.)  
7 / 11  
7 / 11  
7 / 11  
7 / 11  
Manifold Pressure  
3.5 / 10  
3.5 / 10  
3.5 /10  
3.5 /10  
(Natural/Propane) High Stage (" w.c.)  
Orifice Size (Natural/Propane)  
#43 / #55  
#43 / #55  
#43 / #55  
#43 / #55  
Number of Burners  
2
4
3
4
4
4
5
4
Vent Connector Diameter (inches)(3)  
Shipping Weight (lbs.)  
120  
130  
153  
175  
1 Natural Gas BTU/h. For altitudes above 2,000’, reduce input rating 4% for each 1,000’ above sea level.  
2 DOE AFUE based upon Isolated Combustion System (ICS)  
3 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).  
4 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.  
5 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.  
NOTES:  
*
*
These furnaces are manufactured for natural gas operation. Optional Kits are available for conversion to propane gas operation.  
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.  
*
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.  
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.  
11  
 
FURNACE SPECIFICATIONS  
GHS8  
MODEL  
GHS80453AXC*  
GHS80704BXC*  
GHS80905CXC*  
Input, Natural Gas (BTUH)(1)  
Output, Natural Gas (BTUH)(1)  
45,000  
36,000  
32,000  
80.0%  
0.20 - 0.50  
15 - 45  
-0.80  
70,000  
56,000  
48,000  
80.0%  
90,000  
72,000  
64,000  
80.0%  
Output, LP (BTUH)  
A.F.U.E.(2 )  
Rated External Static (" w.c.)  
0.20 - 0.50  
30 - 60  
-0.70  
0.20 - 0.50  
35 - 65  
-0.70  
Temperature Rise (°F)  
Pressure Switch Trip Point (" w.c.)  
Blower Wheel (D" x W")  
Blower Horsepower  
11” x 6”  
1/2  
11” x 8”  
3/4  
11” x 10”  
3/4  
Blower Speeds  
Refer to airflow charts.  
Max CFM @ 0.5 E.S.P.  
Power Supply (Volts/Hz/Ph)  
115/60/1  
12.5  
15  
115/60/1  
11.8  
15  
115/60/1  
11.8  
15  
(4)  
Minimum Circuit Ampacity (MCA)  
Maximum Overcurrent Device (5)  
Transformer (VA)  
40  
40  
40  
ID Blower Pressure Switch Trip Point (" w.c.)  
Primary Limit Setting (°F)  
-0.80  
140  
-0.70  
120  
-0.70  
140  
Auxiliary Limit Setting (°F)  
120  
120  
120  
Rollout Limit Setting (°F)  
300  
300  
300  
Gas Supply Pressure (Natural/Propane) (" w.c.)  
Manifold Pressure (Natural/Propane) (" w.c.)  
Orifice Size (Natural/Propane)  
Number of Burners  
7 / 11  
3.5 / 10  
43 / 55  
2
7 / 11  
3.5 / 10  
43 / 55  
3
7 / 11  
3.5 / 10  
43 / 55  
4
Vent Connector Diameter (inches)(3)  
4
4
4
Shipping Weight (lbs.)  
120  
130  
153  
1 Natural Gas BTU/h. For altitudes above 2,000’, reduce input rating 4% for each 1,000’ above sea level.  
2 DOE AFUE based upon Isolated Combustion System (ICS)  
3 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).  
4 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.  
5 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.  
NOTES:  
*
*
These furnaces are manufactured for natural gas operation. Optional Kits are available for conversion to propane gas operation.  
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.  
*
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.  
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.  
 
BLOWER PERFORMANCE SPECIFICATIONS  
GHS8  
BLOWER PERFORMANCE  
(CFM & Temperature Rise vs. External Static Pressure)  
Tons AC  
at 0.5"  
EXTERNAL STATIC PRESSURE (Inches Water Column)  
0.2 0.3 0.4 0.5  
Mo del  
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  
4.0  
3.5  
3.0  
3.0  
5.0  
4.0  
3.5  
3.0  
1,739 19 1,656 20 1,601 21 1,551 21 1,513 22 1,460 1,413 1,353  
1,422 23 1,399 24 1,378 24 1,350 25 1,305 26 1,275 1,220 1,178  
1,207 28 1,213 27 1,197 28 1,169 29 1,158 29 1,131 1,103 1,068  
GHS8  
0453AXC  
(Med)²  
Med-Lo  
Low  
991  
34  
980  
34  
958  
35  
950  
35  
937  
36  
924  
910  
874  
High  
2,097 25 2,068 25 2,012 26 1,939 27 1,869 28 1,795 1,718 1,631  
1,596 32 1,566 33 1,534 34 1,492 35 1,445 36 1,401 1,354 1288  
1,380 38 1,356 38 1,328 39 1,303 40 1,274 41 1,239 1,192 1127  
GHS8  
0704BXC  
(Med)²  
Med  
Med-Lo  
Low  
1239  
42  
1191  
44  
1165  
45  
1133  
46 1,104 47 1,082 1,040 996  
High  
2,382 28 2,315 29 2,234 30 2,158 31 2,078 32 1,971 1,866 1,762  
1,622 41 1,603 42 1,583 42 1,556 43 1,516 44 1,482 1,422 1,359  
1,436 46 1,391 48 1,387 48 1,356 49 1,325 50 1,279 1,239 1,180  
1,240 54 1,214 55 1,191 56 1,157 58 1,120 60 1,083 1,052 1,025  
GHS8  
0905CXC  
(Med)²  
Med  
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 high-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 indicates  
ranges in excess of maximum static pressure allowed when heating.  
The dashed (---) areas indicate a temperature rise not recommended for this model.  
The above chart is for U.S. furnaces installed at 0' - 2,000'. 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.  
13  
 
BLOWER PERFORMANCE SPECIFICATIONS  
GDS8  
BLOWER PERFORMANCE  
(CFM & Temperature Rise vs. External Static Pressure)  
EXTERNAL STATIC PRESSURE (Inches Water Column)  
Tons AC  
at 0.5"  
ESP  
3.0  
Model  
Motor  
Speed  
0.1  
0.2  
0.3  
0.4  
0.5  
0.6 0.7 0.8  
Heating Speed  
( )  
As Shipped  
CFM RISE CFM RISE CFM RISE CFM RISE CFM RISE CFM CFM CFM  
HIGH  
MED  
1,353  
1,183  
980  
25 1,290 26 1,246 27 1,199 28 1,149 29 1,116 1,116 1,099  
28 1,113 30 1,098 30 1,052 32 1,039 32 1,006 1,012 969  
GDS8  
0453AXC  
(Med)²  
2.5  
MED-LO  
LOW  
2.0  
34  
43  
946  
762  
35  
44  
920  
738  
36  
45  
900  
746  
37  
45  
896  
738  
37  
45  
885 855 804  
717 696 678  
1.5  
778  
HIGH  
3.0  
1,290  
1,139  
962  
40 1,236 42 1,194 43 1,166 44 1,176 44 1,166 1,108 1,029  
46 1,090 48 1,035 50 1,063 49 1,063 49 1020 962 895  
GDS8  
0703AXC  
(Med)²  
MED  
2.5  
MED-LO  
LOW  
2.0  
54  
66  
927  
776  
56  
67  
925  
763  
56  
68  
941  
744  
55  
70  
909  
723  
57  
72  
877 834 779  
690 641 581  
1.5  
787  
HIGH  
4.0  
2,128  
1,840  
1,602  
1,277  
2,405  
1,880  
1659  
1,472  
31 2,063 32 2,001 33 1,927 35 1,824 37 1,726 1,628 1,529  
36 1,788 37 1,745 38 1,689 39 1,625 41 1,550 1,470 1,364  
42 1,558 43 1,543 43 1,493 45 1,455 46 1,402 1,328 1,239  
52 1,252 53 1,244 54 1,229 54 1,214 55 1,179 1141 1079  
35 2,361 36 2,250 38 2,161 39 2,037 42 1,937 1,808 1,689  
45 1,838 46 1,794 47 1,734 49 1,677 51 1,568 1,510 1,401  
51 1,630 52 1,587 54 1,537 55 1,492 57 1,445 1,368 1,287  
58 1,454 59 1,404 61 1,366 62 1,326 64 1300 1228 1139  
GDS8  
0904BXC  
(Med)²  
MED  
3.5  
MED-LO  
LOW  
3.0  
2.5  
HIGH  
5.0  
GDS8  
1155CXC  
(Med)²  
MED  
4.0  
MED-LO  
LOW  
3.5  
3.0  
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 indicates  
ranges in excess of maximum static pressure allowed when heating.  
The dashed (---) areas indicate a temperature rise not recommended for this model.  
The above chart is for U.S. furnaces installed at 0' - 2,000'. 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.  
14  
 
BLOWER PERFORMANCE SPECIFICATIONS  
S E E R U I R A T  
M P T E E R  
15  
 
WIRING DIAGRAMS  
G*S8  
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.  
BOX  
Wiring is subject to change, always refer to the wiring diagram on the unit for the most up-to-date wiring.  
16  
 

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