Goodman GHS8, GDS8 User Manual

TECHNICAL MANUTECHNICAL MANU

TECHNICAL MANU

TECHNICAL MANUTECHNICAL MANU

ALAL

AL

ALAL

GDS8 & GHS8

33-3/8" 80% Gas Furnace Unit s

• 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.

Copyright © 2009 Goodman Manufacturing Company, L.P.

Copyright © 2005-2007 Goodman Manufacturing Company, L.P.

RT6622011

September 2009

PRODUCT IDENTIFICATION

x

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 3 A X C A

BR AND:

G: Go od m an
Brand

®

A IR FL O W DIRE CTION

D: Ded icat ed Downflow
H: Hig h A irf low

FURNACE
TYPE

S: Single Stage/

Multi- speed

AFUE:

8: 80%

NOMINAL INPUT:

045: 45,000 Btuh
070: 70,000 Btuh
090: 70,000 Btuh
115 : 115,000 B tuh

AIRFLOW

CAPABILITY:

3 : 120 0
4 : 160 0
5 : 200 0

CA BINE T WIDTH :

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

MAJOR
REVISION:

ADDITIO N AL
FE AT URES:

N: Natural Gas

X: Low NO

MINOR
REVISION:

WARNING

WARNING

WARNING

WARNING

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.

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

2

HIGH VOLTAGE!

WARNING

WARNING

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.

Installation and repair of this unit
should be performed ONLY by

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

WARNING

WARNING

WARNING

Serious property damage, personal injury, reduced unit
performance and/or hazardous conditions may result
from the use of such non-approved devices.

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.

WARNING

WARNING

do not store combustible materials or use gasoline or
other flammable liquids or vapors in the vicinity of this
appliance.

To prevent the risk of property
damage, personal injury, or death,

3

PRODUCT DESIGN

g

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 illustra-

tion on pages 5 and 6.)

This furnace is also equipped with a self-diagnosing elec­tronic control module. In the event a furnace component is
not operating properly, the control module LED will flash on
and off in a factory-programmed sequence, depending on
the problem encountered. This light can be viewed through
the observation window in the blower access door. Refer to
the Troubleshooting Chart for further explanation of the LED
codes and Abnormal Operation - Integrated Ignition Control
section in the Service Instructions for an explanation of the
possible problem.

The rated heating capacity of the furnace should be greater
than or equal to the total heat loss of the area to be heated.
The total heat loss should be calculated by an approved
method or in accordance with “ASHRAE Guide” or “Manual
J-Load Calculations” published by the Air Conditioning Con­tractors of America.

*Obtain from: American National Standards Institute 1430
Broadway New York, NY 10018

Location Considerations

• The furnace should be as centralized as is practical
with respect to the air distribution system.

• Do not install the furnace directly on carpeting, tile, or
combustible material other than wood flooring.

• When installed in a residential garage, the furnace
must be positioned so the burners and ignition source
are located not less than 18 inches (457 mm) above
the floor and protected from physical damage by ve­hicles.

Notes:

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 CL EARAN CE TO COMBUSTIBLE MATERIALS - INCHES

Sides TopRear Front*

1036 11

* 24" c learance for serviceabil ity r ecommended.
** Sin

le Wal l V ent (SW) to be used only as a c onnec tor .
Refer to the v enting tables outli ned in the Ins tall ation M anual for
addit ional vent ing requirements.

Vent

SW B

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)

US BURNER

ORIFICE

CANADA BURNER

ORIFICE

HA-02 HIGH ALTITUDE CONVERSION KIT REQUIRED

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.

2000 3000 4000 4500 5000 6000 7000 8000

44/55 44/55 45/56 45/56 46/57 47/58 47/58

44/55 47/57

WARNING

O PREVENT POSSIB LE PERSONAL I NJURY OR DEATH DUE TO ASPHYXI ATION,

T

THIS FURNACE MUST BE

C

ATEGORY

III

VENTING.

ATEGORY I VENTED. DO NOT VENT USI NG

C

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*

GHS80704BXC*

GHS80905CXC*

MODEL A B

GDS80453AXC*

GDS80703AXC*

GDS80904BXC*

GDS81155CXC*

14 1/ 2" 12 1/2"
17 1/2" 1 6"

21" 1 9 1/2"

14 1/ 2" 12 1/2"

17 1/2" 1 6"

21" 1 9 1/2"

5

PRODUCT DESIGN

GHS8

Pressure Switch Trip Points

And Usage Chart

Trip Point

Model

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.)

ID Blower

Pressure

Switch

-0.80 0130F00042

-0.70 B1370158

-0.70 B1370158

ID Blower

Pressure

Switch

Pa rt #

PRIMARY LIMIT

Part Number 0130M00063 20162903

Open Setting (°F)

GHS80453AXC*

GHS80704BXC*

140 120

1---

--- 1

GHS80905CXC*

ROLLOUT LIMIT SWITCHES

Part Number B1370145

Open Setting (°F)

GHS80453AXC*

GHS80704BXC*

GHS80905CXC*

300

2

2

2

1---

AUXILIARY LIMIT SWITCHES

Part Number 0130F00038

Open Setting (°F)

GHS80453AXC*

GHS80704BXC*

GHS80905CXC*

120

1

1

1

6

PRODUCT DESIGN

GDS8

Presssure Switches

Model Part No. Opens*

GDS80453AXC*

GDS80703AXC*

GDS80904BXC*

GDS81155CXC*

B1370142 -0.60

B137158 -0.70

B1370142 -0.60

B137158 -0.70

PRIMARY LIMIT

Part Nu mber 0130F00035 0130F00036

Open Setting (°F)

GDS80453AXC*

GDS80703AXC*

GDS80904BXC*

GDS81155CXC*

220 180

1---

1---

--- 1

--- 1

ROLLOUT LIMIT SWITCHES

Part Number B1370145

Open Setting (°F)

GDS80453AXC*

GDS80703AXC*

GDS80904BXC*

GDS81155CXC*

300

2

2

2

2

AUXILIARY LIMIT SWITCHES

Part Number 0130F00038

Open Setting (°F)

GDS80453AXC*

GDS80703AXC*

GDS80904BXC*

GDS81155CXC*

120

1

1

1

1

7

PRODUCT DESIGN

r

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

PRODUCT

TYPE:

C: Indoor Coil

APPLICATION

A: Up fl ow/Downfl ow Coil
H: Horizontal A Coil
S: Horizo ntal Slab Coil

EXPANSION
DEVICE:

F: Flowrate

CAB INET F INI SH:

U: Unpainted
P: Painted
N: Unpaint ed Case

NOMINAL CA P ACIT Y RA NGE
@ 13 SEER

1824: 1 1/2 t o 2 Ton s
3030: 2 1/2 To ns
3636: 3 Tons
3642: 3 to 3 1/ 2 Ton s
3743: 3 to 3 1/ 2 Ton s
4860: 4 & 5 Tons
4961: 4 & 5 Tons

REVISION

A : Revision

REFRIGERANT
CHARGE:

6 : R- 4 10A or R-22
2: R - 22
4: R - 410a

NOM IN AL WIDT H FO R GAS FURN ACE

A: Fits 14 " F ur nace Cabine t
B: Fits 17 1/2" Furnace Cabinet
C: Fits 21" Furnace Cabinet
D: Fits 24 1/2" Furna ce Cabinet
N : Do es Not Apply (Hor izontal Slab Coils)

• 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:

BOTT O M RET URNSIDE RETURN

Cabinet

Width

(in.)

Nominal

Filter Size

(in.)

Approx.

Flow Area

2

)

(in

Cabinet

Width

(in.)

Nominal

Filter Size

(in.)

All 16 x 25 x 1 400 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

Approx.

Flow Area

2

)

(in

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.

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

COOLING AIRFLOW REQUIREMENT (CFM)

600 800 1000 1200 1400 1600 2000

0704__XA --- --- 641* 641* 672 768 ---

Input

0905__XA --- --- --- 854* 854* 854* 960

Airflow

UPFLOW

COUNTERFLOW

COOLING AIRFLO W 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

Input__Airflow

COOLING AIRFLO W REQUIREMENT (CFM)

600 800 1000 1200 1400 1600 2000

0704__XA --- --- 320* 320* 336 384 ---

Input

0905__XA --- --- --- 427* 427* 427* 480

Airflow

*Minimum filter area dictated by heating airflow requirement. *Minimum filter area dictated by heating airflow requirement.

Disposable Minimum Filter Area (in2)

[Based on a 300 ft/min filter face velocity]

Permanent Minimum Filter Area (in2)

[Based on 600 ft/min filter face velocity]

UPFLOW

COUNTERFLOW

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

Filter Area

2

(in

)

600

800

1000

Qty

2

2

2

Filter Size

(in)

15 X 20 X 1

20 X 20 X 1

25 X 20 X 1

Dimension "A"

(in)

Optional

Access

Door

Return Air

"A"
Min

Cabinet Width

21 13.0

24 1/2 11.3

21 18.8

24 1/2 17.7

21 24.3

24 1/2 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 GDS80453AXC* GDS80703AXC* GDS80904BXC* GDS8115 5CXC*

GDS8

Btu h Inpu t (US) Hig h Fi r e
Output (US) High Fire
A.F.U.E.

(2)

(1)

(1)

45,000 70,000 90,000 115,000
36,000 56,000 72,000 92,000

80% 80% 80% 80%
Ra ted External Static (" w.c.) .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

Bl ower Wheel (D" x W") 10 X 6 10 x 6 10 x 8 10 x 10
Blower Hor s epower 1/ 3 1/3 1/ 2 3/ 4
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

Minimum Circuit Ampacity (MCA)
Maximum Overcurrent Device

(5)

(4)

8.5 8.5 12.9 12.9
15 15 15 15

Trans former ( V A ) 40 40 40 40
Hea t Antic i pato r (Am ps) 0. 7 0.7 0 .7 0.7
Primary Lim it S etting (° F) 220 220 180 180
Au xi liary Limi t Setting (°F) 120 120 120 120
Ro llout Limi t Set ting (°F) 300 300 300 3 00
Gas Supply Pressure (Natural/Propane) (" w.c.) 7 / 11 7 / 11 7 / 11 7 / 11

Manifold Pressure
(N atural/ P r opane) High Stage (" w.c.)

3. 5 / 10 3.5 / 10 3. 5 /10 3.5 /10

Orifice Siz e ( Nat ur al/Propane) #43 / #55 #43 / #55 #43 / #55 #43 / #55
Nu m ber of Burner s 2 3 4 5
Ve nt Conne c tor Diamet er ( inches)

(3)

4444

Shipping Weight (lbs.) 120 130 153 175

1 Nat ur al Gas BTU/h. F or altitu des abov e 2,000’, reduce input rating 4% fo r each 1,000’ abov e sea level.
2 DOE AF UE ba sed upon Isol ated C ombu st i on System ( ICS)
3 Vent and combus ti on ai r diame ters may vary de pendi n g upon ven t le ngth.
Refer to the latest editions of the National Fuel Gas Code NFPA 54/ANSI Z22 3.1 (in the USA) and the Canada National Standa rd of Canada, CAN/CSA B149.1

an d C AN /CSA B142.2 (i n Ca nada) .
4 Minim um Circuit Ampacity = (1.25 x Circulator Bl owe r Am ps) + I D Blower am ps. Wi re si ze s houl d be determined in accorda nc e w ith National Electrical Codes.

Extensi ve wire runs wil l requir e l ar ger wir e size s.
5 Maxi m um Ov er current Protec tio n De vice refers to m aximum re comm ended fuse or cir cuit break er size. Ma y us e fus es or H AC R - type circuit breakers of the s ame siz e as not e d.

Notes:

• All furnac e s are manufactur ed for use on 11 5 VAC, 60 Hz, sin g l e-p hase electr ical supply.

• Gas Serv ice C o nnect i o n ½ ” FPT

• Imp or tant: Si ze fuses and wir es properly and m ake elect r ical connections in ac cordanc e w it h the National E lectri cal Co de and /or all existing lo cal 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 GHS80453AXC* GHS80704BXC* GHS80905CXC*

GHS8

Input, Natural Gas (BTUH)

(1)

Output, Natu ral Gas ( BTU H )

(1)

45,000 70,000 90,000

36,000 56,000 72,000
Output, LP (BTUH) 32,000 48,000 64,000
A.F.U.E.

(2)

80.0% 80.0% 80.0%
Ra ted Exter nal Static (" w. c .) 0.20 - 0.50 0.20 - 0.50 0.20 - 0. 50
Tem perature Ris e (°F) 1 5 - 4 5 30 - 60 35 - 65
Pres sure Swi tch Trip Point (" w.c.) -0. 80 -0.70 -0. 70
Blower Wh eel (D" x W") 11 ” x 6” 11” x 8” 11 ” x 10”
Blo w er Ho r sepow er 1/ 2 3 /4 3 /4
Blower Spe eds

Refe r to air f lo w char ts.

Max CFM @ 0.5 E.S.P.
Power Supply (Volts/Hz/Ph) 115/60/1 115/60/1 115/60/1

Mini mum Circ u i t Am p a city ( M CA )
Maximum Overcurrent Device

(5)

(4)

12.5 11.8 11.8
15 15 15

Transformer ( V A) 4 0 40 40
ID Blower Pressure Switch Trip Point (" w.c.) -0.80 -0.70 -0.70
Primary Limit Setting (°F) 140 120 140
Auxiliary Limit Sett ing (°F) 1 20 1 20 12 0
Ro llout Limit Sett ing (°F) 3 00 3 00 30 0
Gas Supply Pre ssu r e ( Nat ur al/Pr opane) (" w. c.) 7 / 11 7 / 11 7 / 11
Manifol d P r essure (Na tural/Pr opane) (" w.c.) 3.5 / 10 3.5 / 10 3.5 / 10
Or ifice Size (Natural/Pr opane) 43 / 55 43 / 5 5 4 3 / 55
Nu m ber of Burners 2 3 4
Vent Connector Diameter (inches)

(3)

444

Shipping W eight (lbs.) 120 130 153

1 Nat ur al Gas BTU/h. F or altitu des abov e 2,000’, reduce input rating 4% fo r each 1,000’ abov e sea level.
2 DOE AF UE ba sed upon Isol ated C ombu st i on System ( ICS)
3 Vent and combus ti on ai r diame ters may vary de pendi n g upon ven t le ngth.
Refer to the latest editions of the National Fuel Gas Code NFPA 54/ANSI Z22 3.1 (in the USA) and the Canada National Standa rd of Canada, CAN/CSA B149.1

an d C AN /CSA B142.2 (i n Ca nada) .
4 Minim um Circuit Ampacity = (1.25 x Circulator Bl owe r Am ps) + I D Blower am ps. Wi re si ze s houl d be determined in accorda nc e w ith National Electrical Codes.

Extensi ve wire runs wil l requir e l ar ger wir e sizes.
5 Maxi m um Ov er current Protec tio n De vice refers to m aximum re comm ended fuse or cir cuit break er size. Ma y us e fus es or H AC R - type circuit breakers of the s ame siz e as not e d.

Notes:

• All furnac e s are manufactur ed for use on 11 5 VAC, 60 Hz, sin g l e-p hase electr ical supply.

• Gas Serv ice C o nnect i o n ½ ” FPT

• Imp or tant: Si ze fuses and wir es properly and m ake elect r ical connections in ac cordanc e w it h the National E lectri cal Co de and /or all existing lo cal 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 PERF ORMANCE

(CFM & Temperature Rise vs. External Static Pressure)

Model

Heating Speed

(

As Shipped

GHS8

0453AXC

(Med)²

GHS8

0704BXC

(Med)²

GHS8

0905CXC

(Med)²

Tons AC

Motor

Speed

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 36 924 910 874
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 1,040 996
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

a t 0. 5" 0.6 0.7 0 .8

ESP CFM RISE CFM RISE CF M RISE CFM RISE CFM RISE CFM CF M CFM

0.1 0.2 0.3 0.4 0.5

EXTERNAL STATIC PRESSURE (Inches Water Co lumn)

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

BLOWER PERFORMANCE

(CFM & Temp eratur e Ri se vs. External Sta tic Press ure)

GDS8

Model

Motor

Heating Speed

()

As Shipped

GDS8

0453AXC

(Med)²

GDS8

0703AXC

(Med)²

GDS8

0904BXC

(Med)²

Speed

H IGH 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
H IGH 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
H IGH 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

Tons AC

a t 0.5" 0 . 6 0.7 0.8

0.1 0.2 0.3 0.4 0.5

EXTERNAL STATIC PRESS URE (Inches Water Column)

ESP CFM RISE CFM RISE CFM RISE CFM RISE CFM RISE CFM CFM CFM

H IGH 5.0 2,405 35 2,361 36 2,250 38 2,161 39 2,037 42 1,937 1,808 1,689

GDS8

1155CXC

(Med)²

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.

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

14

BLOWER PERFORMANCE SPECIFICATIONS

÷ CFM

130 140 150

FORMULAS

BTU OUTPUT = CFM x 1.08 x RISE

1.08

BTU OUTPUT

RISE =

100

2400 CFM

2200

2000

1800

1600

1400

1200

1100

1000

900

800

OUTPUT BTU/HR x 1000

BTU OUTPUT vs TEMPERATURE RISE CHART

600 CFM

700

30 40 50 60 70 80 90 110 120

100

90

80

70

60

50

40

30

20

10

TEMPERATURE RISE

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.

16

X

O

B

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