UNBRANDED G8SD Single Stage Upflow Horizontal Gas Furnaces User Manual
- June 15, 2024
- UNBRANDED
Table of Contents
UNBRANDED G8SD Single Stage Upflow Horizontal Gas Furnaces
The gas furnace may be installed free-standing in a utility room, or basement, or enclosed in an alcove or closet. The rounded corner jacket provides a pleasing “appliance appearance.” Design certified by UL 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, 100, 140 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.
- 45-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 assemblies: 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.
- 7-segment LED for easy troubleshooting: Saves time by providing easy-to-read fault codes.
- 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 losing 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.
DIMENSIONS
COMPONENTS
MODEL IDENTIFICATION CODE
SPECIFICATIONS
| G8SD MODEL NUMBERS | -050U-T23A* | -070U-T24B* | -100U-T35C* |
|---|---|---|---|
| Input – Btuh (a) | 50,000 | 70,000 | 100,000 |
| Heating Capacity – BtuH | 48,000 | 67,000 | 95,000 |
| AFUE | 95.0 | 95.0 | 95.0 |
| Motor H.P. – Speed – Type | 3/4 – 9 – ECM | 3/4 – 9 – ECM | 1 – 9 – ECM |
| Motor FLA | 8.4 | 8.4 | 11 |
| Rated Ext. SP – In. W.C. | 0.5 | 0.5 | 0.5 |
| Temperature Rise Range – F | 30-60 | 30-60 | 35-65 |
| Shipping Weights | 115 | 133 | 153 |
| NOx | <14ng/J | <14ng/J | <14ng/J |
ACCESSORIES
G8SD KITS
Description| SKU
Side return filter kit| 541036
AIRFLOW DATA
HEATING AIRFLOW (CFM) & TEMPERATURE RISE (°F)
MODEL NAME/ HEATING INPUT G8SD
| ****
RETURN AIR VIA:
| ****
MOTOR SPEED
| EXTERNAL STATIC PRESSURE (IN. W.C.)
0.1| 0.2| 0.3| 0.4| 0.5
CFM| RISE| CFM| RISE| CFM| RISE| CFM|
RISE| CFM| RISE
-050U-T23A*
50,000 BTU/h Input
48,000 BTU/h Output
| ****
Bottom
| Tap 9| | | | | | | | | |
Tap 8| | | | | | | | | |
Tap 7| | | | | | | | | |
Tap 6| | | | | | | | | |
Tap 5| 970| 45| 935| 47| 915| 48| 880| 50| 845| 52
Tap 4| 875| 50| 835| 53| 810| 54| 770| 57| 735| 60
Tap 3| 835| 53| 795| 55| 765| 57| | | |
Tap 2| | | | | | | | | |
Tap 1| | | | | | | | | |
Side
| Tap 9| | | | | | | | | |
Tap 8| | | | | | | | | |
Tap 7| | | | | | | | | |
Tap 6| | | | | | | | | |
Tap 5| 935| 47| 915| 48| 880| 50| 845| 52| 805| 55
Tap 4| 850| 52| 815| 54| 780| 56| 745| 59| |
Tap 3| 815| 54| 775| 57| 740| 59| | | |
Tap 2| | | | | | | | | |
Tap 1| | | | | | | | | |
COOLING AIRFLOW (CFM)
MODEL NAME/ HEATING INPUT G8SD
| ****
RETURN AIR VIA:
| ****
MOTOR SPEED
| EXTERNAL STATIC PRESSURE (IN. W.C.)
0.1| 0.2| 0.3| 0.4| 0.5| 0.6| 0.7| 0.8
CFM| CFM| CFM| CFM| CFM| (CFM)| (CFM)|
(CFM)
-050U-T23A*
50,000 BTU/h Input
48,000 BTU/h Output
| ****
Bottom Only
| Tap 9| 1,420| 1,395| 1,360| 1,330| 1,300| 1,280| 1,245| 1,220
Tap 8| 1,310| 1,270| 1,245| 1,215| 1,180| 1,145| 1,120| 1,095
Tap 7| 1,180| 1,145| 1,115| 1,085| 1,050| 1,020| 990| 955
Tap 6| 1,085| 1,050| 1,015| 985| 950| 920| 890| 855
Tap 5| 970| 935| 915| 880| 845| 810| 780| 745
Tap 4| 875| 835| 810| 770| 735| 700| 665| 630
Tap 3| 835| 795| 765| 725| 690| 655| 615| 580
Tap 2| 650| 590| 560| 520| 465| 430| 380| 340
Tap 1| 550| 485| 450| 405| 330| 290| 250| 195
Left Side Only Motor
| Tap 9| 1,410| 1,380| 1,350| 1,315| 1,285| 1,255| 1,225| 1,200
Tap 8| 1,290| 1,260| 1,230| 1,195| 1,160| 1,135| 1,100| 1,070
Tap 7| 1,145| 1,115| 1,090| 1,055| 1,030| 995| 960| 920
Tap 6| 1,045| 1,015| 980| 950| 920| 885| 855| 825
Tap 5| 935| 915| 880| 845| 805| 775| 745| 695
Tap 4| 850| 815| 780| 745| 715| 665| 625| 585
Tap 3| 815| 775| 740| 700| 675| 620| 575| 540
Tap 2| 605| 575| 530| 495| 445| 390| 325| 235
Tap 1| 495| 470| 410| 365| 320| 260| 160|
NOTES:
- To comply with government-mandated efficiency standards, two openings are required for airflows above 1,600 CFM.
- Data is shown without filter.
- Temperature rises in the table are approximate. Actual temperature rises may vary.
- Individual cells shaded in gray indicate a temperature rise outside of the recommended range.
- To comply with government-mandated efficiency standards, speed settings shaded in gray are not allowed in HEAT mode.
- 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.
HEATING AIRFLOW (CFM) & TEMPERATURE RISE (°F)
MODEL NAME/ HEATING INPUT G8SD|
RETURN AIR VIA:
| MOTOR SPEED TAP| EXTERNAL STATIC PRESSURE (IN. W.C.)
0.1| 0.2| 0.3| 0.4| 0.5
CFM| RISE| CFM| RISE| CFM| RISE| CFM|
RISE| CFM| RISE
G8SD-070U-T24B*
70,000 BTU/h Input
67,000 BTU/h Output
|
Bottom Only
| 9| | | | | | | | | |
8| | | | | | | | | |
7| | | | | | | | | |
6 | 1,460| 42| 1,430| 43| 1,385| 45| 1,345| 46| 1,300| 48
5 | 1,380| 45| 1,330| 47| 1,285| 48| 1,240| 50| 1,200| 52
4| 1,065| 58| | | | | | | |
3| | | | | | | | | |
2| | | | | | | | | |
1 | | | | | | | | | |
Side Only
| 9| | | | | | | | | |
8| | | | | | | | | |
7| | | | | | | | | |
6 | 1,440| 43| 1,400| 44| 1,360| 46| 1,315| 47| 1,270| 49
5 | 1,340| 46| 1,295| 48| 1,255| 49| 1,215| 51| 1,170| 53
4| | | | | | | | | |
3| | | | | | | | | |
2| | | | | | | | | |
1 | | | | | | | | | |
Side + Bottom
| 9| | | | | | | | | |
8| | | | | | | | | |
7| | | | | | | | | |
6 | 1,460| 42| 1,415| 44| 1,375| 45| 1,330| 47| 1,290| 48
5 | 1,400| 44| 1,355| 46| 1,310| 47| 1,270| 49| 1,225| 51
4| 1,065| 58| | | | | | | |
3| | | | | | | | | |
2| | | | | | | | | |
1 | | | | | | | | | |
NOTES:
- To comply with government-mandated efficiency standards, two openings are required for airflows above 1,600 CFM.
- Data is shown without filter.
- Temperature rises in the table are approximate. Actual temperature rises may vary.
- Individual cells shaded in gray indicate a temperature rise outside of the recommended range.
- To comply with government-mandated efficiency standards, speed settings shaded in gray are not allowed in HEAT mode.
- 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.
COOLING AIRFLOW (CFM)
MODEL NAME/ HEATING INPUT G8SD|
RETURN AIR VIA:
| MOTOR SPEED TAP| EXTERNAL STATIC PRESSURE (IN. W.C.)
0.1| 0.2| 0.3| 0.4| 0.5| 0.6| 0.7| 0.8
CFM| CFM| CFM| CFM| CFM| (CFM)| (CFM)|
(CFM)
G8SD-070U-T24B*
70,000 BTUH/h Input
67,000 BTU/h Output
|
Bottom Only
| 9| 1,775| 1,745| 1,705| 1,660| 1,620| 1,580| 1,540| 1,500
8| 1,640| 1,605| 1,560| 1,525| 1,485| 1,440| 1,400| 1,350
7| 1,565| 1,525| 1,480| 1,440| 1,390| 1,355| 1,310| 1,260
6 | 1,460| 1,430| 1,385| 1,345| 1,300| 1,260| 1,215| 1,175
5 | 1,380| 1,330| 1,285| 1,240| 1,200| 1,150| 1,110| 1,065
4| 1,065| 1,015| 965| 920| 870| 815| 755| 700
3| 860| 770| 735| 670| 610| 560| 490| 460
2| 625| 550| 490| 435| 365| | |
1 | 660| 610| 550| 460| 430| 360| |
Side Only
| 9| 1,715| 1,710| 1,675| 1,640| 1,600| 1,565| 1,525| 1,480
8| 1,600| 1,565| 1,530| 1,490| 1,445| 1,410| 1,370| 1,320
7| 1,515| 1,480| 1,440| 1,405| 1,360| 1,320| 1,275| 1,230
6 | 1,440| 1,400| 1,360| 1,315| 1,270| 1,230| 1,180| 1,130
5 | 1,340| 1,295| 1,255| 1,215| 1,170| 1,120| 1,070| 1,020
4| 1,025| 980| 925| 875| 820| 780| 740| 680
3| 830| 760| 700| 650| 595| 525| 495| 465
2| 585| 530| 490| 420| 370| | |
1 | 695| 600| 565| 470| 400| 385| |
Bottom + Side
| 9| 1,820| 1,785| 1,745| 1,710| 1,665| 1,625| 1,585| 1,540
8| 1,675| 1,640| 1,600| 1,550| 1,515| 1,480| 1,435| 1,390
7| 1,585| 1,545| 1,500| 1,460| 1,420| 1,380| 1,340| 1,295
6 | 1,460| 1,415| 1,375| 1,330| 1,290| 1,245| 1,205| 1,160
5 | 1,400| 1,355| 1,310| 1,270| 1,225| 1,180| 1,135| 1,090
4| 1,065| 1,010| 965| 915| 850| 810| 755| 710
3| 860| 790| 735| 680| 625| 550| 500| 460
2| 650| 550| 500| 435| 390| | |
1 | 680| 600| 550| 480| 420| 390| |
NOTES:
- To comply with government-mandated efficiency standards, two openings are required for airflows above 1,600 CFM.
- Data is shown without filter.
- Temperature rises in the table are approximate. Actual temperature rises may vary.
- Individual cells shaded in gray indicate a temperature rise outside of the recommended range.
- To comply with government-mandated efficiency standards, speed settings shaded in gray are not allowed in HEAT mode.
- 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.
HEATING AIRFLOW (CFM) & TEMPERATURE RISE (°F)
MODEL NAME/ HEATING INPUT G8SD|
RETURN AIR VIA:
| MOTOR SPEED TAP| EXTERNAL STATIC PRESSURE (IN. W.C.)
0.1| 0.2| 0.3| 0.4| 0.5
CFM| RISE| CFM| RISE| CFM| RISE| CFM|
RISE| CFM| RISE
G8SD-100U-T35C*
100,000 BTU/h Input
95,000 BTU/h Output
|
Bottom Only
| 9| – – –| – – –| – – –| – – –| – – –| – – –| – – –| – – –| – – –| – – –
8| – – –| – – –| – – –| – – –| – – –| – – –| – – –| – – –| – – –| – – –
7| – – –| – – –| – – –| – – –| – – –| – – –| – – –| – – –| – – –| – – –
6 | 1,850| 48| 1,790| 49| 1,745| 50| 1,700| 52| 1,650| 53
5 | 1,745| 50| 1,690| 52| 1,645| 53| 1,590| 55| 1,535| 57
4| 1,480| 59| 1,420| 62| 1,360| 65| | | |
3| | | | | | | | | |
2| | | | | | | | | |
1 | | | | | | | | | |
Side Only
| 9| – – –| – – –| – – –| – – –| – – –| – – –| – – –| – – –| – – –| – – –
8| – – –| – – –| – – –| – – –| – – –| – – –| – – –| – – –| – – –| – – –
7| – – –| – – –| – – –| – – –| – – –| – – –| – – –| – – –| – – –| – – –
6 | 1,785| 49| 1,740| 51| 1,690| 52| 1,640| 54| 1,590| 55
5 | 1,690| 52| 1,640| 54| 1,595| 55| 1,540| 57| 1,490| 59
4| 1,435| 61| 1,375| 64| 1,300| | | | |
3| | | | | | | | | |
2| | | | | | | | | |
1 | | | | | | | | | |
Side + Bottom
| 9| – – –| – – –| – – –| – – –| – – –| – – –| – – –| – – –| – – –| – – –
8| – – –| – – –| – – –| – – –| – – –| – – –| – – –| – – –| – – –| – – –
7| – – –| – – –| – – –| – – –| – – –| – – –| – – –| – – –| – – –| – – –
6 | 1,865| 47| 1,810| 49| 1,755| 50| 1,695| 52| 1,645| 53
5 | 1,760| 50| 1,705| 52| 1,655| 53| 1,595| 55| 1,535| 57
4| 1,495| 59| 1,430| 62| 1,365| 64| | | |
3| | | | | | | | | |
2| | | | | | | | | |
1 | | | | | | | | | |
NOTES:
- To comply with government-mandated efficiency standards, two openings are required for airflows above 1,600 CFM.
- Data is shown without filter.
- Temperature rises in the table are approximate. Actual temperature rises may vary.
- Individual cells shaded in gray indicate a temperature rise outside of the recommended range.
- To comply with government-mandated efficiency standards, speed settings shaded in gray are not allowed in HEAT mode.
- 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.
COOLING AIRFLOW (CFM)
MODEL NAME/ HEATING INPUT G8SD|
RETURN AIR VIA:
| MOTOR SPEED TAP| EXTERNAL STATIC PRESSURE (IN. W.C.)
0.1| 0.2| 0.3| 0.4| 0.5| 0.6| 0.7| 0.8
CFM| CFM| CFM| CFM| CFM| (CFM)| (CFM)|
(CFM)
G8SD-100U-T35C*
100,000 BTUH/h Input
95,000 BTU/h Output
|
Bottom Only
| 9| 2,250| 2,250| 2,190| 2,130| 2,080| 2,025| 1,975| 1,915
8| 2,055| 2,010| 1,970| 1,900| 1,840| 1,790| 1,730| 1,675
7| 1,900| 1,845| 1,795| 1,750| 1,700| 1,650| 1,575| 1,520
6 | 1,850| 1,790| 1,745| 1,700| 1,650| 1,595| 1,535| 1,470
5 | 1,745| 1,690| 1,645| 1,590| 1,535| 1,485| 1,420| 1,365
4| 1,480| 1,420| 1,360| 1,300| 1,230| 1,165| 1,110| 1,055
3| 1,315| 1,245| 1,170| 1,100| 1,025| 975| 915| 860
2| 1,140| 1,055| 975| 890| 820| 765| 705| 660
1 | 1,025| 920| 830| 745| 690| 625| 580| 500
Side Only
| 9| 2,155| 2,110| 2,075| 2,020| 1,975| 1,965| 1,950| 1,900
8| 1,980| 1,940| 1,890| 1,850| 1,805| 1,760| 1,710| 1,650
7| 1,835| 1,785| 1,740| 1,685| 1,635| 1,585| 1,545| 1,495
6 | 1,785| 1,740| 1,690| 1,640| 1,590| 1,540| 1,490| 1,440
5 | 1,690| 1,640| 1,595| 1,540| 1,490| 1,440| 1,390| 1,340
4| 1,435| 1,375| 1,300| 1,250| 1,195| 1,140| 1,080| 1,020
3| 1,265| 1,190| 1,140| 1,070| 1,005| 935| 875| 815
2| 1,095| 1,015| 945| 870| 790| 715| 665| 615
1 | 980| 905| 835| 740| 665| 590| 525| 440
Bottom + Side
| 9| 2,245| 2,195| 2,155| 2,095| 2,065| 2,070| 2,015| 1,950
8| 2,080| 2,030| 1,980| 1,930| 1,880| 1,820| 1,765| 1,705
7| 1,915| 1,875| 1,820| 1,765| 1,715| 1,655| 1,600| 1,535
6 | 1,865| 1,810| 1,755| 1,695| 1,645| 1,585| 1,530| 1,485
5 | 1,760| 1,705| 1,655| 1,595| 1,535| 1,480| 1,430| 1,370
4| 1,495| 1,430| 1,365| 1,290| 1,235| 1,170| 1,115| 1,065
3| 1,325| 1,245| 1,175| 1,095| 1,035| 970| 910| 855
2| 1,175| 1,065| 965| 900| 810| 775| 705| 635
1 | 1,040| 930| 850| 750| 680| 610| 560| 475
NOTES:
- To comply with government-mandated efficiency standards, two openings are required for airflows above 1,600 CFM.
- Data is shown without filter.
- Temperature rises in the table are approximate. Actual temperature rises may vary.
- Individual cells shaded in gray indicate a temperature rise outside of the recommended range.
- To comply with government-mandated efficiency standards, speed settings shaded in gray are not allowed in HEAT mode.
- 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.
WARRANTY
GENERAL TERMS OF LIMITED WARRANTY
Nortek Global HVAC, LLC will furnish a replacement for any part of this
product that 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 (05/2021)
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