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.
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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.
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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
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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
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BLOWER PERFORMANCE SPECIFICATIONS
S E E R U I R A T
M P T E E R
15
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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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