Goodman Mfg Co Lp Gas Heater Gds8 Users Manual

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TECHNICAL MANU
AL
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.

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.

RT6622011
September 2009

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.

G

D

S

8

045

BRAND:
®
G: Goodman
Brand

3

AIRFLOW
CAPABILITY:
3: 1200
4: 1600
5: 2000

AFUE:
8: 80%
AIRFLOW DIRECTION
D: Dedicated Downflow
H: High Airflow

2

C

A

ADDITIONAL
FEATURES:
N: Natural Gas
X: Low NOx

MINOR
REVISION:

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

NOMINAL INPUT:
045: 45,000 Btuh
070: 70,000 Btuh
090: 70,000 Btuh
115: 115,000 Btuh

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

X

MAJOR
REVISION:
FURNACE
TYPE
S: Single Stage/
Multi-speed

WARNING

A

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.
GDS80453AXC*
GDS80703AXC*
GDS80904BXC*
GDS81155CXC*
GHS80453AXC*
GHS80704AXC*
GHS81155CXC*

* These models available in 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 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 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.

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 clearance 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" 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.

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
When this furnace is installed at high altitude, the appropriate High Altitude orifice kit must be installed. This is required 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.
INPUT PER BURNER - 22,500 BTUH NATURAL GAS / 20,000 BTUH L.P.
ELEVATION ABOVE SEA-LEVEL (FEET)
2000

3000

4000

US BURNER
ORIFICE

44/55

44/55

45/56

CANADA BURNER
ORIFICE

44/55

4500

5000

6000

7000

8000

45/56

46/57

47/58

47/58

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
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

High altitude kits are purchased according to the installation 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 Natural Gas and Propane Gas kits. For a tabular listing of appropriate 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 Accessory Charts in Service Instructions.

PRODUCT DIMENSIONS

MODEL

A

B

GHS80453AXC*

14 1/2"

12 1/2"

GHS80704BXC*

17 1/2"

16"

GHS80905CXC*

21"

19 1/2"

MODEL

A

B

14 1/2"

12 1/2"

GDS80904BXC*

17 1/2"

16"

GDS81155CXC*

21"

19 1/2"

GDS80453AXC*
GDS80703AXC*

5

PRODUCT DESIGN

GHS8
Pressure Switch Trip Points
And Usage Chart

Model

Trip Point
ID Blower
Pressure
Switch

ID Blower
Pressure
Switch
Part #

GHS80453AXC*

-0.80

0130F00042

GHS80704BXC*

-0.70

B1370158

GHS80905CXC*

-0.70

B1370158

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

0130M00063

20162903

Open Setting (°F)

140

120

GHS80453AXC*

1

---

GHS80704BXC*

---

1

GHS80905CXC*

1

---

ROLLOUT LIMIT SWITCHES

6

AUXILIARY LIMIT SWITCHES

Part Number

B1370145

Part Number

0130F00038

Open Setting (°F)

300

Open Setting (°F)

120

GHS80453AXC*

2

GHS80453AXC*

1

GHS80704BXC*

2

GHS80704BXC*

1

GHS80905CXC*

2

GHS80905CXC*

1

PRODUCT DESIGN

GDS8
Presssure Switches
Model

Part No.

Opens*

GDS80453AXC*

B1370142

-0.60

GDS80703AXC*

B137158

-0.70

GDS80904BXC*

B1370142

-0.60

GDS81155CXC*

B137158

-0.70

PRIMARY LIMIT
Part Number

0130F00035

0130F00036

Open Setting (°F)

220

180

GDS80453AXC*

1

---

GDS80703AXC*

1

---

GDS80904BXC*

---

1

GDS81155CXC*

---

1

ROLLOUT LIMIT SWITCHES

AUXILIARY LIMIT SWITCHES

Part Number

B1370145

Part Number

0130F00038

Open Setting (°F)

300

Open Setting (°F)

120

GDS80453AXC*

2

GDS80453AXC*

1

GDS80703AXC*

2

GDS80703AXC*

1

GDS80904BXC*

2

GDS80904BXC*

1

GDS81155CXC*

2

GDS81155CXC*

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

EXPANSION
DEVICE:
F: Flowrater

PRODUCT
TYPE:
C: Indoor Coil

CABINET FINISH:
U: Unpainted
P: Painted
N: Unpainted Case
APPLICATION
A: Upflow/Downflow Coil
H: Horizontal A Coil
S: Horizontal Slab Coil

A
REVISION
A: Revision

REFRIGERANT
CHARGE:
6: R-410A or R-22
2: R-22
4: R-410a
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)

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
Approx.
Cabinet
Nominal
Width
Filter Size Flow Area
(in.)
(in.)
(in2)
All
16 x 25 x 1
400

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

UPFLOW
COOLING AIRFLOW REQUIREMENT (CFM)

600

800

1000

1200

1400

1600

2000

0704__XA

---

---

564*

564*

672

768

0905__XA

---

---

---

752*

752*

768

960

1155__XA

---

---

---

940*

940*

940*

960

Input__Airflow

Input__Airflow

UPFLOW
COOLING AIRFLOW REQUIREMENT (CFM)

600

800

1000

1200

1400

1600

2000

0704__XA

---

---

627*

627*

672

768

---

0905__XA

---

---

---

836*

836*

836*

960

1155__XA

---

---

---

940*

940*

940*

960

COUNTERFLOW
COOLING AIRFLOW REQUIREMENT (CFM)

600

800

1000

1200

1400

1600

2000

0704__XA

---

---

641*

641*

672

768

---

0905__XA

---

---

---

854*

854*

854*

960

Input
Airflow

Input
Airflow

COUNTERFLOW
COOLING AIRFLOW REQUIREMENT (CFM)

600

800

1000

1200

1400

1600

2000

0704__XA

---

---

320*

320*

336

384

---

0905__XA

---

---

---

427*

427*

427*

480

*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
This furnace has provisions for the installation of return air filters at the counterflow top return. The furnace will accommodate
the following filter sizes depending on cabinet size:

Counterflow Top Return

Return Air
Optional
Access
Door

Cabinet Width
"A"
Min

21
24 1/2
21
24 1/2
21
24 1/2

Filter Area Qty Filter Size Dimension "A"
(in)
(in)
(in2)
600

2

15 X 20 X 1

800

2

20 X 20 X 1

1000

2

25 X 20 X 1

13.0
11.3
18.8
17.7
24.3
23.4

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
MODEL

GDS8

GDS80453AXC* GDS80703AXC* GDS80904BXC* GDS81155CXC*

(1)

45,000

70,000

90,000

115,000

36,000

56,000

72,000

92,000

80%

80%

80%

80%

.20 - .50

.20 - .50

.20 - .50

.20 - .50

Temperature Rise (°F)

35-65

30-60

35-65

40 - 70

Pressure Switch Trip Point (" w.c.)

-0.60

-0.70

-0.60

-0.70

10 X 6

10 x 6

10 x 8

10 x 10

1/3

1/3

1/2

3/4

Btuh Input (US) High Fire
Output (US) High Fire

(1)

(2)

A.F.U.E.

Rated External Static (" w.c.)

Blower Wheel (D" x W")
Blower Horsepower
Blower Speeds

Refer toairflow charts.

Max CFM @ 0.5 E.S.P.
Power Supply

115-60-1

115-60-1

115-60-1

115-60-1

8.5

8.5

12.9

12.9

15

15

15

15

Transformer (VA)

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

7 / 11

7 / 11

7 / 11

7 / 11

3.5 / 10

3.5 / 10

3.5 /10

3.5 /10

#43 / #55

#43 / #55

#43 / #55

#43 / #55

2

3

4

5

4

4

4

4

120

130

153

175

(4)

Minimum Circuit Ampacity (MCA)
(5)

Maximum Overcurrent Device

Gas Supply Pressure (Natural/Propane) (" w.c.)
Manifold Pressure
(Natural/Propane) High Stage (" w.c.)
Orifice Size (Natural/Propane)
Number of Burners
(3)

Vent Connector Diameter (inches)
Shipping Weight (lbs.)

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
MODEL

GHS8
GHS80453AXC*

GHS80704BXC*

GHS80905CXC*

45,000

70,000

90,000

36,000

56,000

72,000

Output, LP (BTUH)

32,000

48,000

64,000

(2)

80.0%

80.0%

80.0%

0.20 - 0.50

0.20 - 0.50

0.20 - 0.50

15 - 45

30 - 60

35 - 65

-0.80

-0.70

-0.70

11” x 6”

11” x 8”

11” x 10”

1/2

3/4

3/4

Input, Natural Gas (BTUH)

(1)
(1)

Output, Natural Gas (BTUH)
A.F.U.E.

Rated External Static (" w.c.)
Temperature Rise (°F)
Pressure Switch Trip Point (" w.c.)
Blower Wheel (D" x W")
Blower Horsepower
Blower Speeds

Refer to airflow charts.

Max CFM @ 0.5 E.S.P.
Power Supply (Volts/Hz/Ph)

115/60/1

115/60/1

115/60/1

12.5

11.8

11.8

15

15

15

40

40

40

-0.80

-0.70

-0.70

Primary Limit Setting (°F)

140

120

140

Aux iliary Limit Setting (°F)

120

120

120

Rollout Limit Setting (°F)

300

300

300

7 / 11

7 / 11

7 / 11

Manifold Pressure (Natural/Propane) (" w.c.)

3.5 / 10

3.5 / 10

3.5 / 10

Orifice Size (Natural/Propane)

43 / 55

43 / 55

43 / 55

2

3

4

4

4

4

120

130

153

(4)

Minimum Circuit Ampacity (MCA)
Maximum Overcurrent Device

(5)

Transformer (VA)
ID Blower Pressure Switch Trip Point (" w.c.)

Gas Supply Pres sure (Natural/Propane) (" w.c.)

Number of Burners
(3)

Vent Connector Diameter (inches)
Shipping Weight (lbs.)

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

Model

(

Heating Speed
As Shipped

GHS8
0453AXC
(Med)²

GHS8
0704BXC
(Med)²

GHS8
0905CXC
(Med)²

)

Motor
Speed

at 0.5"
ESP

EXTERNAL STATIC PRESSURE (Inches Water Column)
0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

CFM RISE CFM RISE CFM RISE CFM RISE CFM RISE CFM CFM CFM

High

3.0

1,739

19

1,656

20

1,601

21

1,551

21

1,513

22

1,460 1,413 1,353

Med

2.5

1,422

23

1,399

24

1,378

24

1,350

25

1,305

26

1,275 1,220 1,178

Med-Lo

2.0

1,207

28

1,213

27

1,197

28

1,169

29

1,158

29

1,131 1,103 1,068

Low

1.5

991

34

980

34

958

35

950

35

937

36

High

4.0

2,097

25

2,068

25

2,012

26

1,939

27

1,869

28

1,795 1,718 1,631

Med

3.5

1,596

32

1,566

33

1,534

34

1,492

35

1,445

36

1,401 1,354 1288

Med-Lo

3.0

1,380

38

1,356

38

1,328

39

1,303

40

1,274

41

1,239 1,192 1127

Low

3.0

1239

42

1191

44

1165

45

1133

46

1,104

47

1,082 1,040

High

5.0

2,382

28

2,315

29

2,234

30

2,158

31

2,078

32

1,971 1,866 1,762

Med

4.0

1,622

41

1,603

42

1,583

42

1,556

43

1,516

44

1,482 1,422 1,359

Med-Lo

3.5

1,436

46

1,391

48

1,387

48

1,356

49

1,325

50

1,279 1,239 1,180

Low

3.0

1,240

54

1,214

55

1,191

56

1,157

58

1,120

60

1,083 1,052 1,025

924

910

874

996

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)

(

)

Heating Speed
As Shipped

GDS8
0453AXC
(Med)²

GDS8
0703AXC
(Med)²

GDS8
0904BXC
(Med)²

GDS8
1155CXC
(Med)²

EXTERNAL STATIC PRESSURE (Inches Water Column)

Tons AC

Model

Motor
Speed

at 0.5"
ESP

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

CFM RISE CFM RISE CFM RISE CFM RISE CFM RISE CFM CFM CFM

HIGH

3.0

1,353

25

1,290

26

1,246

27

1,199

28

1,149

29

1,116 1,116 1,099

MED

2.5

1,183

28

1,113

30

1,098

30

1,052

32

1,039

32

1,006 1,012 969

MED-LO

2.0

980

34

946

35

920

36

900

37

896

37

885

855

804

LOW

1.5

778

43

762

44

738

45

746

45

738

45

717

696

678

HIGH

3.0

1,290

40

1,236

42

1,194

43

1,166

44

1,176

44

1,166 1,108 1,029

MED

2.5

1,139

46

1,090

48

1,035

50

1,063

49

1,063

49

1020

962

895

MED-LO

2.0

962

54

927

56

925

56

941

55

909

57

877

834

779

LOW

1.5

787

66

776

67

763

68

744

70

723

72

690

641

581

HIGH

4.0

2,128

31

2,063

32

2,001

33

1,927

35

1,824

37

1,726 1,628 1,529

MED

3.5

1,840

36

1,788

37

1,745

38

1,689

39

1,625

41

1,550 1,470 1,364

MED-LO

3.0

1,602

42

1,558

43

1,543

43

1,493

45

1,455

46

1,402 1,328 1,239

LOW

2.5

1,277

52

1,252

53

1,244

54

1,229

54

1,214

55

1,179 1141 1079

HIGH

5.0

2,405

35

2,361

36

2,250

38

2,161

39

2,037

42

1,937 1,808 1,689

MED

4.0

1,880

45

1,838

46

1,794

47

1,734

49

1,677

51

1,568 1,510 1,401

MED-LO

3.5

1659

51

1,630

52

1,587

54

1,537

55

1,492

57

1,445 1,368 1,287

LOW

3.0

1,472

58

1,454

59

1,404

61

1,366

62

1,326

64

1300 1228 1139

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

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 =
÷ CFM
1.08

BTU OUTPUT vs TEMPERATURE RISE CHART

150

BLOWER PERFORMANCE SPECIFICATIONS

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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