NuTone KG7T Two Stage Fixed Speed Gas Furnace Owner’s Manual

NuTone KG7T Two Stage Fixed Speed Gas Furnace

Technical Specifications

The KG7T (C and L Series) is a two-stage, fixed speed ECM, condensing upflow/horizontal and downflow gas furnace. It has an induced draft with a 95.1 AFUE and an input range of 60,000 to 120,000 Btuh. The furnace can be installed freestanding in a utility room, basement, or enclosed in an alcove or closet. It is designed for upflow or horizontal application and comes with an extended flush jacket for a pleasing appliance appearance. The KG7T is CSA certified for application in Canada and the United States.

Warranty

No information provided in the user manual.

Features and Benefits

• Two-stage operation for improved comfort and energy savings
• Fixed speed ECM motor for efficient airflow
• Condensing design for high efficiency
• Induced draft for safe and reliable operation
• Flame sensor for detecting the presence of a flame
• Roll-out switch for safety in case of overheating
• Pressure switches for proper functioning of the inducer
• Main air limit switch and inducer limit switch for controlling air flow
• Blower door switch for safety during maintenance
• Motor control box for controlling the operation of the motor
• Motor choke (C & D cabinets only) for additional motor protection
• Burner assembly, igniter, gas valve, and furnace control board for heating function
• Pressure switches (condensate) for monitoring condensate levels
• Transformer for converting voltage
• Motor control board for controlling the operation of the blower assembly
• Blower assembly (behind blower panel) for circulating air

Location of Furnace Components

The furnace components are located as follows:

• Flame Sensor
• Finish Flange
• Roll-Out Switch
• Pressure Switches (Inducer)
• Main Air Limit Switch
• Inducer Limit Switch
• Inducer Assembly
• Blower Door Switch
• Motor Control Box
• Motor Choke (C & D cabinets only)
• Burner Assembly
• Igniter
• Gas Valve
• Furnace Control Board
• Pressure Switches (Condensate)
• Transformer
• Motor Control Board
• Blower Assembly (behind blower panel)

Air Flow

The air flow in the furnace is controlled by the main air limit switch, inducer limit switch, and blower assembly. The inducer assembly helps to create the draft necessary for combustion. The blower assembly circulates the heated air throughout the system.

Upflow/Horizontal Gas Furnace Components

The following components are specific to upflow/horizontal units:

• Blower Assembly (behind blower panel)
• Motor Choke (C & D cabinets only)
• Finish Flange
• Furnace Control Board
• Motor Control Board

Downflow Gas Furnace Components

The following components are specific to downflow units:

• Blower Assembly (behind blower panel)
• Motor Choke (C & D cabinets only)
• Finish Flange
• Furnace Control Board
• Motor Control Board

Dimensions

The dimensions of the KG7T furnace vary based on the cabinet size:

Note: Dimensions are shown in inches.

Model Identification Code

The KG7T furnace model identification code is as follows: KG7T + Series + Cabinet Width + Cooling Airflow + Input Heating Capacity

Example: KG7T C 090 C 23 B

The model code provides information about the cabinet width, cooling airflow, and input heating capacity of the furnace.

Specifications

Model Numbers| Input-Btuh(a)| Heating Capacity-Btuh| AFUE| Cooling Airflow| Blower Size| Static Pressure (in WC)| Gas Connection| Weight
---|---|---|---|---|---|---|---|---
KG7TC/TL – 060D-24B| 60,000/39,000| 57,000/37,050| 95.1%| 2-3 Tons| 11×8 1/2-BLDC| 6.2| 0.5| 125 lbs
KG7TC/TL – 080D-35C| 80,000/52,000| 76,000/49,400| 95.1%| 3-5 Tons| 11×10-BLDC| 8.7| 0.5| 135 lbs
KG7TC/TL – 100D-35C| 100,000/65,000| 95,000/61,750| 95.1%| 3-5 Tons| 11×10-BLDC| 8.7| 0.5| 145 lbs
KG7TC/TL – 120D-45D| 120,000/78,000| 114,000/74,100| 95.1%*| 4-5 Tons| 11×10-BLDC| 11.7| 0.5| 160 lbs

Two Stage, Fixed Speed ECM, Condensing Upflow/Horizontal and Downflow Gas Furnaces

• Induced Draft – 95.1 AFUE
• Input 60,000 – 120,000 Btuh

The high efficiency upflow gas furnace may be installed free standing in a utility room, basement, or enclosed in an alcove or closet. Upflow/Horizontal units come ready for upflow or horizontal application. The extended flush jacket provides a pleasing “appliance appearance.” Design certified by CSA for application in Canada and the United States.

WARRANTY

• 10 Year all-parts warranty.
• 1 Year Quality Pledge to replace the unit if the heat exchanger fails within the first 1 year of operation, to the original owner.
• Consumer product registration required for 10 year All Parts Warranty and Quality Pledge within a limited period of time after the installation. See current warranty document or visit our consumer web site listed on the back of this document for warranty details.
• When registered, this product is upgraded to a limited lifetime heat exchanger warranty.

FEATURES and BENEFITS

• 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.
• 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 an appliance type igniter with a 20 year history of reliability. Utilizes proven Smartlite® technology.
• Color coded wire harness: Designed to fit the components, all with quick-connect fittings for ease of service and replacement.
• Flexible category IV venting system: May be vertically or horizontally vented using either a one-pipe or two-pipe system for maximum flexibility in installation.
• High Static Blowers: All models equipped with high static blowers.
• 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 and stainless steel secondary heat exchanger assures a long life.
• 90 second fixed cooling cycle blower-off delay (TDR): Increases cooling performance when matched with a NORDYNE coil.
• Variable speed blower kit: Upgradable to full variable speed with kit.
• LP convertible: Simple burner orifice and regulator spring change for ease of convertibility.
• 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.
• Incorporates integrated control board: With connections for electronic air cleaner and humidifier.
• Two piece door design: Enhances furnace appearance and uses captured screws to prevent losing door screws.
• Sealed vestibule: Reduces burner and inducer sound levels.
• Energy efficient brushless DC (ECM) motor: Gives up to 1 SEER point efficiency gain in cooling.

LOCATION OF FURNACE COMPONENTS

Upflow/Horizontal Gas Furnace Components

DIMENSIONS

• TC 95.1% Upflow/Horizontal Furnace

NOTES:
Dimensions shown in inches.

• TL 95.1% Downflow Furnace

MODEL IDENTIFICATION CODE

SPECIFICATIONS

KG7TC/TL

MODEL NUMBERS:

| -060D-24B| -080D-35C| -100D-35C| -120D-45D
---|---|---|---|---
Input – Btuh (a)| 60,000 / 39,000| 80,000 / 52,000| 100,000 / 65,000| 120,000 / 78,000
Heating Capacity – Btuh| 57,000 / 37,050| 76,000 / 49,400| 95,000 / 61,750| 114,000 / 74,100
AFUE| 95.1| 95.1| 95.1| 95.1*
Blower D x W| 11 x 8| 11 x 10| 11 x 10| 11 x 10
Motor H.P. – Speed – Type| 1/2 – BLDC| 3/4 – BLDC| 3/4 – BLDC| 1 – BLDC
Motor FLA| 6.2| 8.7| 8.7| 11.7
Rated Ext. SP – In. W.C.| 0.5| 0.5| 0.5| 0.5
Temperature Rise Range – ºF| 30-60| 35-65| 35-65| 40-70
Shipping Weights| 125lbs| 135lbs| 145lbs| 160lbs

• *TL 120 is 94.8% AFUE

Note:
All models are 115V, 60 Hz. Gas Connections are 1/2″ N.P.T. AFUE = Annual Fuel Utilization Efficiency (a) Ratings to 2,000 ft. Over 2,000 ft. reduce 4% for each 1,000 ft. above sea level.

BLOWER PERFORMANCE – KG7TC/TL

KG7TC/TL – 95.1% AFUE, Two Stage Gas Furnace

Model Number &

Heating Input (Btuh)

| ****

Motor Switch Settings (0 = OFF, 1 = ON)

| External Static Pressure (in.W.C.)
0.1| 0.2| 0.3| 0.4| 0.5| 0.6| 0.7| 0.8
1/5| 2/6| 3/7| 4/8| CFM| Rise| CFM| Rise| CFM| Rise| CFM| Rise| CFM| Rise| CFM| Rise| CFM| Rise| CFM| Rise

*TC / TL – 060D – 24B (60,000)

| 0| 0| 0| 0| —| —| —| —| —| —| —| —| —| —| —| —| —| —| —| —
1| 0| 0| 0| —| —| —| —| —| —| —| —| —| —| —| —| —| —| —| —
0| 1| 0| 0| —| —| —| —| —| —| —| —| —| —| —| —| —| —| —| —
1| 1| 0| 0| 725| —| —| —| —| —| —| —| —| —| —| —| —| —| —| —
0| 0| 1| 0| 810| —| —| —| —| —| —| —| —| —| —| —| —| —| —| —
1| 0| 1| 0| 940| 56| 890| 59| 845| —| 795| —| 750| —| 700| —| —| —| —| —
0| 1| 1| 0| 990| 53| 945| 56| 905| 58| 860| —| 820| —| 775| —| 735| —| 690| —
1| 1| 1| 0| 1,055| 50| 1,015| 52| 970| 54| 930| 57| 890| 59| 845| —| 805| —| 760| —
0| 0| 0| 1| 1,135| 47| 1,095| 48| 1,055| 50| 1,010| 52| 960| 55| 930| 57| 890| 59| 850| —
1| 0| 0| 1| 1,185| 45| 1,145| 46| 1,105| 48| 1,065| 50| 1,030| 51| 990| 53| 950| 56| 910| 58
0| 1| 0| 1| 1,250| 42| 1,210| 44| 1,170| 45| 1,135| 47| 1,095| 48| 1,055| 50| 1,020| 52| 980| 54
1| 1| 0| 1| 1,290| 41| 1,255| 42| 1,220| 43| 1,180| 45| 1,145| 46| 1,110| 48| 1,075| 49| 1,040| 51
0| 0| 1| 1| 1,315| 40| 1,275| 41| 1,240| 43| 1,200| 44| 1,160| 45| 1,120| 47| 1,085| 49| 1,045| 51
1| 0| 1| 1| 1,350| 39| 1,315| 40| 1,280| 41| 1,245| 42| 1,205| 44| 1,170| 45| 1,135| 47| 1,100| 48
0| 1| 1| 1| 1,390| 38| 1,350| 39| 1,315| 40| 1,275| 41| 1,240| 43| 1,200| 44| 1,160| 45| 1,125| 47
1| 1| 1| 1| 1,420| 37| 1,380| 38| 1,345| 39| 1,310| 40| 1,270| 42| 1,235| 43| 1,200| 44| 1,160| 45

*TC / TL – 80D – 35C (80,000)

| 0| 0| 0| 0| 1,125| 55| 1,040| —| 960| —| 880| —| 795| —| —| —| —| —| —| —
1| 0| 0| 0| 1,205| 58| 1,120| 63| 1,040| —| 960| —| 875| —| 795| —| —| —| —| —
0| 1| 0| 0| 1,305| 54| 1,225| 57| 1,150| 61| 1,070| —| 995| —| 915| —| 840| —| —| —
1| 1| 0| 0| 1,430| 49| 1,350| 52| 1,270| 55| 1,190| 59| 1,110| 63| 1,030| —| 950| —| 865| —
0| 0| 1| 0| 1,525| 46| 1,450| 49| 1,375| 51| 1,300| 54| 1,225| 57| 1,150| 61| 1,075| 65| 1,000| —
1| 0| 1| 0| 1,620| 43| 1,540| 46| 1,465| 48| 1,390| 51| 1,315| 54| 1,240| 57| 1,165| 60| 1,090| 65
0| 1| 1| 0| 1,695| 42| 1,620| 43| 1,545| 46| 1,465| 48| 1,390| 51| 1,315| 54| 1,235| 57| 1,160| 61
1| 1| 1| 0| 1,770| 40| 1,700| 41| 1,630| 43| 1,555| 45| 1,485| 47| 1,410| 50| 1,340| 53| 1,265| 56
0| 0| 0| 1| 1,875| 38| 1,805| 39| 1,730| 41| 1,655| 43| 1,580| 45| 1,510| 47| 1,435| 49| 1,340| 53
1| 0| 0| 1| 1,905| 37| 1,840| 38| 1,775| 40| 1,710| 41| 1,640| 43| 1,575| 45| 1,510| 47| 1,445| 49
0| 1| 0| 1| 1,980| 36| 1,910| 37| 1,845| 38| 1,780| 40| 1,715| 41| 1,650| 43| 1,580| 45| 1,515| 46
1| 1| 0| 1| 2,025| 35| 1,960| 36| 1,895| 37| 1,830| 38| 1,765| 40| 1,700| 41| 1,635| 43| 1,570| 45
0| 0| 1| 1| 2,085| —| 2,025| 35| 1,960| 36| 1,900| 37| 1,840| 38| 1,775| 40| 1,715| 41| 1,655| 43
1| 0| 1| 1| 2,135| —| 2,070| —| 2,010| 35| 1,945| 36| 1,880| 37| 1,815| 39| 1,750| 40| 1,685| 42
0| 1| 1| 1| 2,200| —| 2,145| —| 2,090| —| 2,035| 35| 1,980| 36| 1,925| 37| 1,870| 38| 1,820| 39
1| 1| 1| 1| 2,280| —| 2,225| —| 2,170| —| 2,115| —| 2,065| —| 2,010| —| 1,955| 36| 1,900| 37

1. Motor Switch Settings are for heating speeds using HEAT switches 1, 2, 3, & 4 and cooling speeds using COOL switches 5, 6, 7, & 8.
2. Two openings are recommended for airflows above 1,600 CFM if the filter(s) is (are) adjacent to the furnace.
3. Data is shown without filter.
4. Temperature rises in the table are approximate. Actual temperature rises may vary
5. Cells shaded in gray indicate a temperature rise outside of the recommended range.
6. When in low stage, the circulating airflow is 70% of the tables high value (2-stage furnaces only).

KG7TC/TL – 95.1% AFUE, Two Stage Gas Furnace

Model Number &

Heating Input (Btuh)

| Motor Switch Settings (0 = OFF, 1 = ON)| External Static Pressure (in.W.C.)
0.1| 0.2| 0.3| 0.4| 0.5| 0.6| 0.7| 0.8
1/5| 2/6| 3/7| 4/8| CFM| Rise| CFM| Rise| CFM| Rise| CFM| Rise| CFM| Rise| CFM| Rise| CFM| Rise| CFM| Rise

*TC / TL – 100D – 35C (100,000)

| 0| 0| 0| 0| 1,125| —| 1,040| —| —| —| —| —| —| —| —| —| —| —| —| —
1| 0| 0| 0| 1,205| —| 1,120| —| 1,040| —| —| —| —| —| —| —| —| —| —| —
0| 1| 0| 0| 1,305| —| 1,225| —| 1,150| —| 1,070| —| 995| —| —| —| —| —| —| —
1| 1| 0| 0| 1,430| 62| 1,350| 65| 1,270| —| 1,190| —| 1,110| —| 1,030| —| —| —| —| —
0| 0| 1| 0| 1,525| 58| 1,450| 61| 1,375| 64| 1,300| —| 1,225| —| 1,150| —| 1,075| —| 1,000| —
1| 0| 1| 0| 1,620| 54| 1,540| 57| 1,465| 60| 1,390| 63| 1,315| —| 1,240| —| 1,165| —| 1,090| —
0| 1| 1| 0| 1,695| 52| 1,620| 54| 1,545| 57| 1,465| 60| 1,390| 63| 1,315| —| 1,235| —| 1,160| —
1| 1| 1| 0| 1,770| 50| 1,700| 52| 1,630| 54| 1,555| 57| 1,485| 59| 1,410| 62| 1,340| —| 1,265| —
0| 0| 0| 1| 1,875| 47| 1,805| 49| 1,730| 51| 1,655| 53| 1,580| 56| 1,510| 58| 1,435| 61| 1,340| —
1| 0| 0| 1| 1,905| 46| 1,840| 48| 1,775| 50| 1,710| 51| 1,640| 54| 1,575| 56| 1,510| 58| 1,445| 61
0| 1| 0| 1| 1,980| 44| 1,910| 46| 1,845| 48| 1,780| 49| 1,715| 51| 1,650| 53| 1,580| 56| 1,515| 58
1| 1| 0| 1| 2,025| 43| 1,960| 45| 1,895| 46| 1,830| 48| 1,765| 50| 1,700| 52| 1,635| 54| 1,570| 56
0| 0| 1| 1| 2,085| 42| 2,025| 43| 1,960| 45| 1,900| 46| 1,840| 48| 1,775| 50| 1,715| 51| 1,655| 53
1| 0| 1| 1| 2,135| 41| 2,070| 42| 2,010| 44| 1,945| 45| 1,880| 47| 1,815| 48| 1,750| 50| 1,685| 52
0| 1| 1| 1| 2,200| 40| 2,145| 41| 2,090| 42| 2,035| 43| 1,980| 44| 1,925| 46| 1,870| 47| 1,820| 48
1| 1| 1| 1| 2,280| 39| 2,225| 40| 2,170| 41| 2,115| 42| 2,065| 43| 2,010| 44| 1,955| 45| 1,900| 46

*TC / TL – 120D – 45D (120,000)

| 0| 0| 0| 0| 1,395| —| 1,350| —| 1,305| —| 1,260| —| 1,210| —| 1,165| —| 1,120| —| —| —
1| 0| 0| 0| 1,465| —| 1,420| —| 1,375| —| 1,330| —| 1,290| —| 1,245| —| 1,200| —| 1,155| —
0| 1| 0| 0| 1,555| 68| 1,510| 70| 1,470| —| 1,425| —| 1,380| —| 1,340| —| 1,295| —| 1,250| —
1| 1| 0| 0| 1,625| 65| 1,585| 67| 1,540| 69| 1,500| 70| 1,460| —| 1,415| —| 1,375| —| 1,335| —
0| 0| 1| 0| 1,690| 62| 1,650| 64| 1,610| 66| 1,570| 67| 1,530| 69| 1,485| —| 1,445| —| 1,405| —
1| 0| 1| 0| 1,760| 60| 1,715| 62| 1,670| 63| 1,625| 65| 1,575| 67| 1,530| 69| 1,485| —| 1,440| —
0| 1| 1| 0| 1,835| 58| 1,790| 59| 1,745| 60| 1,695| 62| 1,650| 64| 1,605| 66| 1,555| 68| 1,510| 70
1| 1| 1| 0| 1,885| 56| 1,840| 57| 1,790| 59| 1,745| 60| 1,700| 62| 1,655| 64| 1,610| 66| 1,565| 67
0| 0| 0| 1| 1,945| 54| 1,900| 56| 1,850| 57| 1,805| 58| 1,760| 60| 1,710| 62| 1,665| 63| 1,620| 65
1| 0| 0| 1| 1,950| 54| 1,905| 55| 1,860| 57| 1,820| 58| 1,775| 59| 1,735| 61| 1,690| 62| 1,650| 64
0| 1| 0| 1| 2,075| 51| 2,030| 52| 1,990| 53| 1,945| 54| 1,900| 56| 1,855| 57| 1,810| 58| 1,770| 60
1| 1| 0| 1| 2,125| 50| 2,085| 51| 2,040| 52| 2,000| 53| 1,955| 54| 1,910| 55| 1,870| 56| 1,825| 58
0| 0| 1| 1| 2,170| 49| 2,130| 50| 2,090| 51| 2,045| 52| 2,005| 53| 1,965| 54| 1,925| 55| 1,880| 56
1| 0| 1| 1| 2,215| 48| 2,180| 48| 2,140| 49| 2,105| 50| 2,070| 51| 2,035| 52| 2,000| 53| 1,965| 54
0| 1| 1| 1| —| —| —| —| —| —| —| —| 2,225| 47| 2,165| 49| 2,100| 50| 2,040| 52
1| 1| 1| 1| —| —| —| —| —| —| —| —| —| —| 2,170| 49| 2,120| 50| 2,065| 51

1. Motor Switch Settings are for heating speeds using HEAT switches 1, 2, 3, & 4 and cooling speeds using COOL switches 5, 6, 7, & 8.
2. Two openings are recommended for airflows above 1,600 CFM if the filter(s) is (are) adjacent to the furnace.
3. Data is shown without filter.
4. Temperature rises in the table are approximate. Actual temperature rises may vary
5. Cells shaded in gray indicate a temperature rise outside of the recommended range.
6. When in low stage, the circulating airflow is 70% of the tables high value (2-stage furnaces only).

VENTING

All models are approved for vertical non direct (1 pipe) and direct (2 pipe) venting applications. See Vent Table below for specified sizes and allowable lengths.

VENT TABLE

NOTES:

1. Subtract 2.5 ft. for each additional 2 inch long radius elbow, 5 ft. for each additional 2 inch short radius elbow, 3.5 ft. for each additional 3 inch long radius elbow, and 7 ft. for each additional 3 inch short radius elbow. Subtract 5ft for each 2” tee and 8ft for each 3” tee.
2. Two 45 degree elbows are equivalent to one 90 degree elbow.
3. This table applies for elevations from sea level to 2,000 ft. For higher elevations, decrease pipe lengths by 8% per 1,000 ft of altitude.

ACCESSORIES

KG7TC/TL KITS

Description| SKU
Fixed speed -to- variable speed| 904880
2″ Concentric vent kit| 904952
3″ Concentric vent kit| 904953
“A” Cabinet downflow sub base kit| 902974
“B”, “C”, “D” Cabinet downflow sub base kit| 904911
2″ Side wall vent kit| 904617
3″ Side wall vent kit| 904347
U.S. LP Conversion kit (0 to 10,000 ft.)| 905028
Canada LP Conversion kit (0 to 4,500 ft.)| 905029
Bottom return filter 20 per box, “A” cabinet| 903088
Bottom return filter 20 per box, “B” cabinet| 904916
Bottom return filter 20 per box, “C” cabinet| 904917
Bottom return filter 20 per box, “D” cabinet| 904918
Side return filter kit| 541036
Neutralizer kit| 902377

WARRANTY

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 (1/2015)

• 835C-0913 (Replaces 835C-0513)
• www.nutonehvac.com

References

• TCPDF

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