Literature Library FG8SA Gas Furnace Owner’s Manual

G8SA Series

FG8SA Gas Furnace

Single Stage Upflow/Horizontal Gas Furnaces
Induced Draft – 80+ AFUE, Ultra-Low NOx
Input 55,000 – 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.
This furnace series requires special heating engine modifications to ensure it emits some of the lowest NOx emissions of any residential furnace. Sound variances from typical 40ng/J furnaces can be expected but have no effect on performance or safety.

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 I 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. Switches on PCB, provide ultra easy motor speed selection.
• 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.

GAS FURNACE DIMENSIONS

ULTRA-LOW NOX UPFLOW/HORIZONTAL FURNACE

**MODEL #’S| DIM. -A-| DIM. -B-| DIM. -C-| DIM. -D-**
055U| 14 1/4| 10 3/4| 12 5/8| 12 7/8
070U| 17 1/2| 11 3/4| 15 7/8| 16 1/8
100U| 21| 14| 19 3/8| 19 7/8

NOTE: Dimensions shown in Inches.

GAS FURNACE COMPONENTS

MODEL IDENTIFICATION CODE

SPECIFICATIONS

ACCESSORIES

G8SA KITS

Description| SKU
Side return filter kit| 541036

AIRFLOW DATA

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

MODEL NAME/ HEATING INPUT G8SA| 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
-055U-T23A| Bottom| 5 – High | | | | | | | | | |
4 – Med-High| | | | | | | | | |
3 – Med-Low | 880| 46| 845| 48| 810| 50| 770| 53| 735| 55
2 – Alternate| 705| 58| 650| 63| 610| | 570| | 530|
1 – Low **| 640| 64| 600| | 555| | 510| | 470|
Side| 5 – High | | | | | | | | | |
4 – Med-High| | | | | | | | | |
3 – Med-Low | 875| 47| 830| 49| 795| 51| 750| 54| 715| 57
2 – Alternate| 685| 59| 650| 63| 595| | 555| | 515|
1 – Low *| 640| 64| 585| | 540| | 500| | 460|
COOLING AIRFLOW (CFM)**

MODEL NAME/ HEATING INPUT G8SA| **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
-055U-T23A| Bottom| 5 – High | 1,180| 1,140| 1,110| 1,080| 1,045| 1,015| 985| 955
4 – Med-High| 920| 880| 850| 810| 775| 740| 700| 665
3 – Med-Low | 880| 845| 810| 770| 735| 700| 665| 630
2 – Alternate| 705| 650| 610| 570| 530| 480| 440| 400
1 – Low | 640| 600| 555| 510| 470| 430| 390| 340
Side| 5 – High | 1,160| 1,125| 1,095| 1,065| 1,040| 1,010| 975| 945
4 – Med-High| 905| 860| 827| 790| 755| 717| 683| 639
3 – Med-Low | 875| 830| 793| 752| 715| 684| 642| 606
2 – Alternate| 685| 650| 595| 555| 515| 471| 424| 376
1 – Low *| 640| 585| 540| 500| 460| 415| |
HEATING AIRFLOW (CFM) & TEMPERATURE RISE (°F)**

**MODEL NAME/ HEATING INPUT| ****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
-070U-T24B| Bottom| 5 – High | | | | | | | | | |
4 – Med-High| | | | | | | | | |
3 – Med-Low | | | | | | | | | |
2 – Alternate| 1,130| 46| 1,070| 48| 1,010| 51| 960| 54| 890| 58
1 – Low | 820| 63| 730| | 630| | 570| | 540|
Side| 5 – High | | | | | | | | | |
4 – Med-High| | | | | | | | | |
3 – Med-Low | | | | | | | | | |
2 – Alternate| 1,090| 48| 1,020| 51| 970| 53| 920| 56| 860| 60
1 – Low *| 740| | 680| | 620| | 560| | 510|
COOLING AIRFLOW (CFM)**

**MODEL NAME/ HEATING INPUT| ****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
-070U-T24B| Bottom| 5 – High | 1,790| 1,740| 1,690| 1,640| 1,590| 1,540| 1,490| 1,440
4 – Med-High| 1,650| 1,590| 1,560| 1,500| 1,450| 1,400| 1,350| 1,290
3 – Med-Low | 1,395| 1,340| 1,290| 1,235| 1,190| 1,130| 1,070| 1,010
2 – Alternate| 1,130| 1,070| 1,010| 960| 890| 820| 770| 720
1 – Low | 820| 730| 630| 570| 540| 490| 430| 380
Side| 5 – High | 1,740| 1,700| 1,660| 1,610| 1,550| 1,510| 1,460| 1,400
4 – Med-High| 1,610| 1,550| 1,510| 1,460| 1,410| 1,360| 1,310| 1,250
3 – Med-Low | 1,350| 1,295| 1,245| 1,185| 1,140| 1,085| 1,035| 985
2 – Alternate| 1,090| 1,020| 970| 920| 860| 800| 750| 700
1 – Low *| 740| 680| 620| 560| 510| 450| 410| 360
HEATING AIRFLOW (CFM) & TEMPERATURE RISE (°F)**

MODEL NAME/ HEATING INPUT G8SA| ****

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
-100U-T35C| Bottom| 5 – High | | | | | | | | | |
4 – Med-High| | | | | | | | | |
3 – Med-Low | 880| 46| 845| 48| 810| 50| 770| 53| 735| 55
2 – Alternate| 705| 58| 650| 63| 610| | 570| | 530|
1 – Low **| 640| 64| 600| | 555| | 510| | 470|
Side| 5 – High | | | | | | | | | |
4 – Med-High| | | | | | | | | |
3 – Med-Low | 875| 47| 830| 49| 795| 51| 750| 54| 715| 57
2 – Alternate| 685| 59| 650| 63| 595| | 555| | 515|
1 – Low | 640| 64| 585| | 540| | 500| | 460|
Side + Bottom or 2 Sides| 5 – High | | | | | | | | | |
4 – Med-High| | | | | | | | | |
3 – Med-Low | 1,600| 46| 1,530| 48| 1,460| 51| 1,400| 53| 1,340| 55
2 – Alternate| 1,525| 49| 1,455| 51| 1,390| 53| 1,330| 56| 1,265| 59
1 – Low *| 1,370| 54| 1,300| 57| 1,230| 60| 1,150| 64| 1,090|
COOLING AIRFLOW (CFM)**

MODEL NAME/ HEATING INPUT G8SA| 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
-100U-T35C| Bottom| 5 – High | 2,310| 2,260| 2,200| 2,150| 2,100| 2,040| 1,990| 1,940
4 – Med-High| 1,870| 1,820| 1,760| 1,720| 1,670| 1,610| 1,560| 1,490
3 – Med-Low | 1,580| 1,530| 1,480| 1,420| 1,360| 1,290| 1,230| 1,155
2 – Alternate| 1,500| 1,450| 1,400| 1,340| 1,280| 1,210| 1,130| 1,050
1 – Low **| 1,390| 1,320| 1,260| 1,200| 1,130| 1,060| 970| 890
Side| 5 – High | 2,160| 2,100| 2,060| 2,020| 2,050| 1,990| 1,950| 1,880
4 – Med-High| 1,810| 1,750| 1,710| 1,660| 1,620| 1,560| 1,510| 1,440
3 – Med-Low | 1,540| 1,490| 1,440| 1,380| 1,330| 1,270| 1,210| 1,150
2 – Alternate| 1,470| 1,420| 1,360| 1,310| 1,260| 1,200| 1,130| 1,070
1 – Low ***| 1,310| 1,250| 1,190| 1,150| 1,080| 1,000| 950| 880

**** Side + Bottom or 2 sides

| 5 – High | 2,280| 2,220| 2,170| 2,120| 2,090| 2,080| 2,020| 1,950
4 – Med-High| 1,880| 1,820| 1,770| 1,720| 1,670| 1,610| 1,560| 1,490
3 – Med-Low | 1,600| 1,530| 1,460| 1,400| 1,340| 1,270| 1,200| 1,120
2 – Alternate| 1,525| 1,455| 1,390| 1,330| 1,265| 1,190| 1,120| 1,045
1 – Low | 1,370| 1,300| 1,230| 1,150| 1,090| 1,000| 920| 860

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.

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 (08/2021)
512F-0821 (Replaces 512F-0520)

References

• TCPDF

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