G8SD Series Single Stage Upflow Horizontal Gas Furnaces

Technical Specifications

G8SD Series

Single Stage Upflow/Horizontal Gas Furnaces

Induced Draft – 95+ AFUE, Ultra-Low NOx Input 50,000 – 100,000
Btuh

The gas furnace may be installed free standing in a utility
room, basement, or enclosed in an alcove or closet. The rounded
corner jacket provides a pleasing appliance appearance. Design
certified by CSA for application in the United States.

This furnace series is approved and certified by the SCAQMD and
the SJVAPC Districts in the state of California with NOx levels
below 14 ng/J when operating on natural gas.

Features and Benefits

• Ultra-Low NOx emissions
• High efficiency with AFUE of 95+
• Single stage heating
• Induced draft for improved combustion
• Free standing or enclosed installation options
• Rounded corner jacket for attractive appearance

Gas Furnace Dimensions

Note: Dimensions shown in Inches.

Gas Furnace Components

• Air / Fuel Mixing Tube
• Gas Burner Head
• Igniter / Flame Sensor Assembly
• Access In-Line Drain Assembly
• Sight Glass
• Primary Air Limit Switch
• Flexible Gas Line Pressure Switches
• Pressure Transducer
• Inducer Assembly
• Inducer Motor
• Pressure Switch
• Blower Door Switch
• Combustion Air Orifice Plate
• Gas Valve
• Pressure Switch
• Blower Limit Switch
• Motor Choke

Gas Furnace Design Series

S = Single Stage T = Two Stage M = Modulating
A = 80% Upflow/Horizontal C = 92.1% / 95.1% Upflow/Horizontal D =
95% Upflow/Horizontal E = 96% Upflow K = 80% Downflow L = 92.1% /
95.1% Downflow M = 95% Downflow N = 96% Downflow Q = 96.4+% AFUE
Upflow/Horizontal

Model Identification Code

G 8 S D 050 U
Input Heating Capacity 050 = 50,000 100 = 100,000
T 23 A
1P
Powder Painted
First Revision
Cabinet Width A = 14.25 B = 17.50 C = 21.00 D = 24.50
Cooling Airflow 23 = 2-3 Tons 24 = 2-4 Tons 35 = 3-5 Tons 45 = 4-5
Tons
Motor Technology V = VSHE E = FSHE T = 5 Tap ECM
NOx C/D = 40 Ng/J or less NOx U = 14 Ng/J or less NOx

Specifications

G8SD MODEL NUMBERS| Input – Btuh (a)| Heating Capacity – BtuH| AFUE| Motor H.P. – Speed – Type| Motor FLA| Rated Ext. SP – In. W.C.| Temperature Rise Range – F| Shipping Weights| NOx
---|---|---|---|---|---|---|---|---|---
-050U-T23A1| 50000| 48000| 95.0| 3/4 – 9 – ECM| 8.4| 0.5| 30-60| 115| C/D = 40 Ng/J or less NOx U = 14 Ng/J or less NOx
-100U-T35C1| 100000| 95000| 95.0| 1 – 9 – ECM| 11| 0.5| 35-65| 153| C/D = 40 Ng/J or less NOx U = 14 Ng/J or less NOx

FAQ

Q: Can the gas furnace be installed in an enclosed
space?

A: Yes, the gas furnace can be installed in an enclosed space
such as a utility room, basement, alcove, or closet.

Q: What is the AFUE rating of this gas
furnace?

A: The gas furnace has an AFUE rating of 95+ which means it is
highly efficient in converting fuel to heat.

Q: Is this gas furnace approved for use in
California?

A: Yes, this gas furnace is approved and certified by the SCAQMD
and the SJVAPC Districts in California with NOx levels below 14
ng/J when operating on natural gas.

Q: What are the dimensions of the gas
furnace?

A: The dimensions vary depending on the model. Please refer to
the “Gas Furnace Dimensions” section for specific dimensions.

Q: What is the motor technology used in this gas
furnace?

A: The motor technology used in this gas furnace can be either
VSHE (Variable Speed High Efficiency), FSHE (Fixed Speed High
Efficiency), or 5 Tap ECM (Electronically Commutated Motor with 5
speed taps).

TECHNICAL SPECIFICATIONS

G8SD Series
Single Stage Upflow/Horizontal Gas Furnaces
Induced Draft – 95+ AFUE, Ultra-Low NOx Input 50,000 – 100,000 Btuh
The gas furnace may be installed free standing in a utility room, basement, or enclosed in an alcove or closet. The rounded corner jacket provides a pleasing “appliance appearance.” Design certified by CSA for application in the United States.
This furnace series is approved and certified by the SCAQMD and the SJVAPC Districts in the state of California with NOx levels below 14 ng/J when operating on natural gas.

FEATURES and BENEFITS
· Ultra-low emissions: 65% less NOx than standard furnaces.
· 100% fired and tested: All units and each component are tested on the manufacturing line.
· Best packaging in the industry: Unique corner post design assures product will arrive to the homeowner dent free.
· Low Boy Height: Easy to apply in low ceiling applications, works well with taller high SEER coils, easier to handle and install.
· Tubular primary heat exchanger: Heavy gauge aluminized steel heat exchanger assures a long life.
· 30 second blower delay at start-up: Assures a warm duct temperature at furnace start-up. Adjustable blower off settings (60, 90, 120 and 180 seconds).
· 30 second post purge: Increases life of heat exchanger. · Hot surface igniter: Innovative application of a silicon
nitride igniter. · Color coded wire harness: Designed to fit the
components, all with quick-connect fittings for ease of service and replacement. · High static blowers: All models equipped with high static blowers. · 60 second cooling cycle blower-off delay (TDR): increases cooling performance when matched with a Nortek Global HVAC coil. · Flexible category IV venting system: May be vented with dedicated venting system or common vented with other category one appliances. · High efficiency blower kits: Maximize efficiencies and provide better temperature control, humidity control and air distribution. · Multi-speed direct drive blower: Energy-efficient, brushless DC (ECM). Designed to give a wide range of cooling capacities. · Diagnostic lights for easy troubleshooting without counting flashes: Dedicated light for flame signal strength and 2 lights in combination to indicate all other fault codes with easy to recognize states without counting flashes. · Integrated control board: Incorporates connections for electronic air cleaner and humidifier. Ergonomically located for ease of service. · Two piece door design: Enhances furnace appearance and uses captured screws to prevent loosing door screws. · Furnace Air Leakage: These furnaces comply with Energy Star cabinet air leakage requirement of less than or equal to 2%. Keep the conditioned air flowing to where it’s needed.

2

GAS FURNACE DIMENSIONS

ULTRA-LOW NOX UPFLOW/HORIZONTAL FURNACE

MODEL #’S

DIM. -A-

DIM. -B-

050U 100U

14 1/4 21

10 3/4 14

NOTE: Dimensions shown in Inches.

DIM. -C-
12 5/8 19 3/8

DIM. -D-
12 7/8 19 7/8

TOP VIEW B

FLANGES

19

BOTTOM VIEW C
Front Brace
Bottom Panel

23 1/2

34 1/2 17 1/4 17 7/8

2 3/4 22 1/2
25 3/8 22 1/2 Vent pipe (Ø 3″)
28 LEFT SIDE

3 1/4
T-stat (Ø 7/8)
Electric (Ø 7/8)
Gas (Ø 1 5/8)

Combustion Air

A

T-stat (Ø 7/8)

Vent pipe (Ø 3″)

Electric (Ø 7/8)
22 1/2 Gas (Ø 1 5/8)

24 7/8

Condensate (Ø 1 1/16)

FRONT VIEW

4 Knockouts

(both sides)

15

1

Cond. (Ø 1 1/16)

23 RIGHT SIDE

1 1/4

GAS FURNACE COMPONENTS
Air / Fuel Mixing Tube

Gas Burner Head
Igniter / Flame Sensor Assembly
Access
In-Line Drain Asssembly

Sight Glass
Primary Air Limit Switch
Flexible Gas Line Pressure Switches

Pressure Transducer
Inducer Assembly
Inducer Motor
Pressure Switch
Blower Door Switch

Combustion Air Orifice Plate
Gas Valve
Pressure Switch
Blower Limit Switch

Motor Choke

3

Gas Furnace
Design Series
S = Single Stage T = Two Stage M = Modulating
A = 80% Upflow/Horizontal C = 92.1% / 95.1% Upflow/Horizontal D = 95% Upflow/Horizontal E = 96% Upflow K = 80% Downflow L = 92.1% / 95.1% Downflow M = 95% Downflow N = 96% Downflow Q = 96.4+% AFUE Upflow/Horizontal

MODEL IDENTIFICATION CODE

G 8 S D 050 U
Input Heating Capacity 050 = 50,000 100 = 100,000

T 23 A

1P

Powder Painted
First Revision
Cabinet Width A = 14.25 B = 17.50 C = 21.00 D = 24.50
Cooling Airflow 23 = 2-3 Tons 24 = 2-4 Tons 35 = 3-5 Tons 45 = 4-5 Tons
Motor Technology V = VSHE E = FSHE T = 5 Tap ECM

NOx C/D = 40 Ng/J or less NOx U = 14 Ng/J or less NOx

SPECIFICATIONS

G8SD MODEL NUMBERS Input – Btuh (a) Heating Capacity – BtuH AFUE Motor H.P. – Speed – Type Motor FLA Rated Ext. SP – In. W.C. Temperature Rise Range – F Shipping Weights NOx

-050U-T23A1 -100U-T35C1

50000

100000

48000

95000

95.0

95.0

3/4 – 9 – ECM 1 – 9 – ECM

8.4

11

0.5

0.5

30-60

35-65

115

153

<14ng/J

<14ng/J

4

ACCESSORIES

Description Side return filter kit

G8SD KITS

SKU 541036

AIRFLOW DATA

MODEL NAME/ HEATING INPUT
G8SD
-050U-T23A*

RETURN AIR VIA:

MOTOR SPEED

Bottom Side

Tap 9 Tap 8 Tap 7 Tap 6
Tap 5
Tap 4 Tap 3 Tap 2 Tap 1 Tap 9 Tap 8 Tap 7 Tap 6 Tap 5 Tap 4 Tap 3 Tap 2 Tap 1

HEATING AIRFLOW (CFM) & TEMPERATURE RISE (°F)

TORQUE SETTING

0.1

CFM

RISE

EXTERNAL STATIC PRESSURE (IN. W.C.)

0.2

0.3

0.4

CFM

RISE

CFM

RISE

CFM

RISE

51.0 42.0 33.0 27.6

22.5

970

45

935

47

915

48

880

50

18.2

875

50

835

53

810

54

770

57

16.2

835

53

795

55

765

57

9.5

6.0

51.0

42.0

33.0

27.6

22.5

935

47

915

48

880

50

845

52

18.2

850

52

815

54

780

56

745

59

16.2

815

54

775

57

740

59

9.5 6.0

MODEL NAME/ HEATING INPUT
G8SD

RETURN AIR VIA:

MOTOR SPEED

-050U-T23A*

Tap 9

Bottom Only

Tap 8 Tap 7 Tap 6 Tap 5 Tap 4 Tap 3

Tap 2

Tap 1

Tap 9

Tap 8

Tap 7

Tap 6 Left Side Only

Motor

Tap 5

Tap 4

Tap 3

Tap 2 Tap 1

COOLING AIRFLOW (CFM)

TORQUE SETTING
51.0 42.0 33.0 27.6 22.5 18.2 16.2 9.5 6.0 51.0 42.0 33.0 27.6 22.5 18.2 16.2 9.5 6.0

0.1
CFM
1,420 1,310 1,180 1,085 970 875 835 650 550 1,410 1,290 1,145 1,045 935 850 815 605 495

EXTERNAL STATIC PRESSURE (IN. W.C.)

0.2

0.3

0.4

0.5

0.6

CFM

CFM

CFM

CFM

(CFM)

1,395 1,270 1,145 1,050
935
835 795 590 485 1,380 1,260 1,115 1,015 915 815 775 575 470

1,360 1,245 1,115 1,015
915
810 765 560 450 1,350 1,230 1,090 980 880 780 740 530 410

1,330 1,215 1,085 985
880
770 725 520 405 1,315 1,195 1,055 950 845 745 700 495 365

1,300 1,180 1,050 950
845
735 690 465 330 1,285 1,160 1,030 920 805 715 675 445 320

1,280 1,145 1,020 920
810
700 655 430 290 1,255 1,135 995 885 775 665 620 390 260

0.7
(CFM)
1,245 1,120 990 890 780 665 615 380 250 1,225 1,100 960 855 745 625 575 325 160

0.8
(CFM)
1,220 1,095 955 855 745 630 580 340 195 1,200 1,070 920 825 695 585 540 235

NOTES: 1. To comply with government mandated efficiency standards, two openings are required for airflows above 1,600 CFM. 2. Data is shown without filter. 3. Temperature rises in the table are approximate. Actual temperature rises may vary. 4. Individual cells shaded in gray indicate a temperature rise outside of the recommended range. 5. To comply with government mandated efficiency standards, speed settings shaded in gray are not allowed in HEAT mode. 6. The “” denotes the factory COOL setting, “” denotes the factory HEAT setting, and “” denotes factory FAN setting. If the Alternate
speed is to be used, the speed tap must be adjusted at the blower motor plug.

0.5

CFM

RISE

845

52

735

60

805

55

5

AIRFLOW DATA

HEATING AIRFLOW (CFM) & TEMPERATURE RISE (°F)

MODEL NAME/ HEATING INPUT
G8SD

RETURN AIR VIA:

MOTOR SPEED
TAP

9 8 7 6 Bottom Only 5 4 3 2 1 9 8 7 6 G8SD-100U-T35C Side Only 5 4 3 2 1 ** 9 8 7 6 Side + Bottom 5 4 3 2 1 ***

0.1 CFM RISE — —– —– –1,850 48 1,745 50 1,480 59 1,315 1,140 1,025 — —– —– –1,785 49 1,690 52 1,435 61 1,265 1,095 980 — —– —– –1,865 47 1,760 50 1,495 59 1,325 1,175 1,040

EXTERNAL STATIC PRESSURE (IN. W.C.)

0.2

0.3

0.4

CFM RISE CFM RISE CFM RISE

— — — — — —

— — — — — —

— — — — — —

1,790 49 1,745 50 1,700 52

1,690 52 1,645 53 1,590 55

1,420 62 1,360 65 1,300

1,245

1,170

1,100

1,055

975

890

920

830

745

— — — — — —

— — — — — —

— — — — — —

1,740 51 1,690 52 1,640 54

1,640 54 1,595 55 1,540 57

1,375 64 1,300

1,250

1,190

1,140

1,070

1,015

945

870

905

835

740

— — — — — —

— — — — — —

— — — — — —

1,810 49 1,755 50 1,695 52

1,705 52 1,655 53 1,595 55

1,430 62 1,365 64 1,290

1,245

1,175

1,095

1,065

965

900

930

850

750

0.5 CFM RISE — —– —– –1,650 53 1,535 57 1,230 1,025 820 690 — —– —– –1,590 55 1,490 59 1,195 1,005 790 665 — —– —– –1,645 53 1,535 57 1,235 1,035 810 680

NOTES: 1. To comply with government mandated efficiency standards, two openings are required for airflows above 1,600 CFM. 2. Data is shown without filter. 3. Temperature rises in the table are approximate. Actual temperature rises may vary. 4. Individual cells shaded in gray indicate a temperature rise outside of the recommended range. 5. To comply with government mandated efficiency standards, speed settings shaded in gray are not allowed in HEAT mode. 6. The “” denotes the factory (default) COOL setting, “” denotes the factory (default) HEAT setting, and “” denotes the factory (default) FAN setting. If an alternate speed is to be used, refer to the installation instructions for Speed Tap Selection.

6

AIRFLOW DATA

COOLING AIRFLOW (CFM)

MODEL NAME/ HEATING INPUT
G8SD

RETURN AIR VIA:

MOTOR SPEED
TAP

0.1 CFM

EXTERNAL STATIC PRESSURE (IN. W.C.) 0.2 0.3 0.4 0.5 0.6 0.7 0.8 CFM CFM CFM CFM (CFM) (CFM) (CFM)

G8SD-100UT35C*

9

8

7

6 *

Bottom Only

5 **

4

3

2

1 ***

9

8

7

6 *

Side Only 5 **

4

3

2

1 ***

9

8

7

6 *

Bottom + Side

5 **

4

3

2

1 ***

2,250 2,055 1,900 1,850
1,745
1,480 1,315 1,140 1,025 2,155 1,980 1,835 1,785 1,690 1,435 1,265 1,095 980 2,245 2,080 1,915 1,865 1,760 1,495 1,325 1,175 1,040

2,250 2,010 1,845 1,790
1,690
1,420 1,245 1,055 920 2,110 1,940 1,785 1,740 1,640 1,375 1,190 1,015 905 2,195 2,030 1,875 1,810 1,705 1,430 1,245 1,065 930

2,190 1,970 1,795 1,745
1,645
1,360 1,170 975 830 2,075 1,890 1,740 1,690 1,595 1,300 1,140 945 835 2,155 1,980 1,820 1,755 1,655 1,365 1,175 965 850

2,130 1,900 1,750 1,700
1,590
1,300 1,100 890 745 2,020 1,850 1,685 1,640 1,540 1,250 1,070 870 740 2,095 1,930 1,765 1,695 1,595 1,290 1,095 900 750

2,080 1,840 1,700 1,650
1,535
1,230 1,025 820 690 1,975 1,805 1,635 1,590 1,490 1,195 1,005 790 665 2,065 1,880 1,715 1,645 1,535 1,235 1,035 810 680

2,025 1,790 1,650 1,595
1,485
1,165 975 765 625 1,965 1,760 1,585 1,540 1,440 1,140 935 715 590 2,070 1,820 1,655 1,585 1,480 1,170 970 775 610

1,975 1,730 1,575 1,535
1,420
1,110 915 705 580 1,950 1,710 1,545 1,490 1,390 1,080 875 665 525 2,015 1,765 1,600 1,530 1,430 1,115 910 705 560

1,915 1,675 1,520 1,470
1,365
1,055 860 660 500 1,900 1,650 1,495 1,440 1,340 1,020 815 615 440 1,950 1,705 1,535 1,485 1,370 1,065 855 635 475

NOTES: 1. To comply with government mandated efficiency standards, two openings are required for airflows above 1,600 CFM. 2. Data is shown without filter. 3. Temperature rises in the table are approximate. Actual temperature rises may vary. 4. Individual cells shaded in gray indicate a temperature rise outside of the recommended range. 5. To comply with government mandated efficiency standards, speed settings shaded in gray are not allowed in HEAT mode. 6. The “” denotes the factory (default) COOL setting, “” denotes the factory (default) HEAT setting, and “” denotes the factory (default) FAN setting. If an alternate speed is to be used, refer to the installation instructions for Speed Tap Selection.

7

GENERAL TERMS OF LIMITED WARRANTY Nortek Global HVAC, LLC will furnish a replacement for any part of this product which fails in normal use and service within the terms and conditions of the warranty.
For complete details of the Limited Warranty, including applicable terms and conditions, see your local installer or contact the Nortek Global HVAC, LLC warranty department for a copy.

Before purchasing this appliance, read important energy cost and efficiency information available from your retailer. Specifications and illustrations subject to change without notice and without incurring obligations. Printed in U.S.A (10/2020)

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