Unitary products group GF8 SERIES Technical Manual

TECHNICAL

TECHNICAL

GUIDE

GUIDE

80 AFUE
MULTI-POSITION
GAS FURNACES

MODELS: GF8 SERIES

4-POSITION
50-125 MBH INPUT

3-POSITION
150 MBH INPUT

EFFICIENCY
RATING
CERTIFIED

Certified Quality

Management System

ISO 9001

270846-UTG-A-0407

DESCRIPTION

These compact units (31-1/2" high) employ induced combus­tion, reliable electronic ignition and high heat transfer heat
exchangers. The units may be factory shipped for upflow/hor­izontal application and converted for downflow application.
These units may also be factory shipped for downflow appli­cation and converted for upflow/horizontal applications
Note: The 150 MBH input model is upflow/horizontal only and
may not be converted to the downflow position.
These furnaces are designed for residential installation in a
basement, closet, alcove, attic, or garage. All units are factory
assembled, wired and tested to assure safe dependable and
economical installation and operation.
These units are Category I listed and may be common vented
with another gas appliance as allowed by the National Fuel
Gas Code.

WARRANTY

20-year limited warranty on the heat exchanger.

5-year limited parts warranty.

FEATURES

• 4-position (MU) upflow models allow horizontal-left, hori­zontal-right, downflow and convertible applications

• 4-position (MD) models allow downflow and convertible
upflow/horizontal applications

• 3-position (UH) 150 MBH input model allows upflow, hori­zontal-left and horizontal-right application

• Reliable, hot surface ignitor

• Integrated control module for simplicity and reliable, eco­nomical operation

• Built-in self-diagnostics with fault code display

• 100% shut off main gas valve for added safety

• Rollout safety control

• Low unit amp requirement for easy application

• High quality inducer motor for quiet operation

• 40 VA, fuse protected control transformer

• Terminals for controlling humidifiers and EAC’s

• Easy to connect power and control wiring

• Efficiency ratings of 80 AFUE

• Cooling blower relay supplied for easy installation of add­on cooling

• Blower off-delay for cooling SEER improvement

• Multi-speed PSC, direct-drive blower motors to match
cooling requirements

• Adjustable fan-off settings to eliminate "cold-blow"

• Compact 31-1/2-in height allows installation in small space
confines

• All models are propane convertible with factory kit

• Pre-painted exterior provides attractive, durable finish

• Models are not approved for LoNox applications

FOR DISTRIBUTION USE ONLY - NOT TO BE USED AT POINT OF RETAIL SALE

270846-UTG-A-0407

DOWNFLOW

BOTTOM VIEW

B

29-3/4

UPFLOW

C

K

31-1/2

31-1/2

A

F

G

A

D

J

E

K

16-1/4

14

29-3/4

H

BOTTOM VIEW

CABINET AND DUCT DIMENSIONS

BTUH (kW)

Input

GF8050B12MU11
GF8075B12MU11
GF8075C16MU11
GF8100C16MU11
GF8100D20MU11
GF8125D20MU11
GF8150D20UH11

1. 4-position models may be factory configured as upflow (MU) or downflow (MD).

2. 3-position 150 MBH model available only in upflow/horizontal (UH) configuration.

4. Dimensions “B”, “C”, “D”, and “E” are with duct flanges turned up. “F”, “G”, “H”, & “J” are with flanges flat.

3. All models are supplied with 3” (7.62 cm) vent connections. An installer supplied transition to 4” (10.16 cm) or 5” (12.7 cm) must be used where necessary.

Nominal

CFM

1
1
1
1
1
1
3

1200 B 17 1/2 16 1/2 20 3/8 20.0 16 14 3/4 18 3/4 15 1/8 19.0 3
1200 B 17 1/2 16 1/2 20 3/8 20.0 16 14 3/4 18 3/4 15 1/8 19.0
1600 C 21 20 20 3/8 20.0 19 1/2 18 1/4 18 3/4 18 5/8 19.0
1600 C 21 20 20 3/8 20.0 19 1/2 18 1/4 18 3/4 18 5/8 19.0
2000 D 24.5 23 1/2 20 3/8 20.0 23 21 3/4 18 3/4 22 1/8 19.0
2000 D 24.5 23 1/2 20 3/8 20.0 23 21 3/4 18 3/4 22 1/8 19.0
2000 D 24 1/2 23 1/2 20 3/8 20.0 23 21 3/4 18 3/4 22 1/8 19.0

Cabinet

Size

A(in.) B(in.) C(in.) D(in.) E(in.) F(in.) G(in.) H(in.) J(in.) K Vent (in.)

Cabinet Dimension

2

4

2

4

2

4

2

4

2

5

2

5

2 Unitary Products Group

RATINGS & PHYSICAL / ELECTRICAL DATA - UPFLOW MODELS

270846-UTG-A-0407

Models

GF8050B12MU11 50 40 1200 17-1/2 8.0 80.0 30-60
GF8075B12MU11 75 60 1200 17-1/2 8.0 80.0 35-65
GF8075C16MU11 75 60 1600 21 11.4 80.0 30-60
GF8100C16MU11 100 80 1600 21 11.4 80.0 40-70
GF8100D20MU11 100 80 2000 24 1/2 11.3 80.0 35-65
GF8125D20MU11 125 100 2000 24 1/2 11.3 80.0 40-70
GF8150D20UH11 150 120 2000 24 1/2 11.3 80.0 40-70

Models

GF8050B12MU11 50 160 1/2 7.0 10 x 8 15 14 112
GF8075B12MU11 75 165 1/2 7.0 10 x 8 15 14 118
GF8075C16MU11 75 160 1/2 10.4 10 x 10 15 14 129
GF8100C16MU11 100 170 1/2 10.4 10 x 10 15 14 135
GF8100D20MU11 100 165 1 10.3 (2)10 x 6 15 14 149
GF8125D20MU11 125 170 1 10.3 (2)10 x 6 15 14 155
GF8150D20UH11 150 170 1 10.3 (2)10 x 6 15 14 165

Nominal external static pressure is 0.50” w.c. at furnace outlet ahead of cooling coils.
Annual Fuel Utilization Efficiency (AFUE) numbers are determined in accordance with DOE Test procedures.
Wire size and over current protection must comply with the National Electrical Code (NFPA-70-latest edition) and all local codes.

Input Output Nominal Airflow Cabinet Width

MBH MBH CFM In. Amps °F

Input

MBH °F Hp Amps In. LBS

Max. Outlet

Air Temp

Blower

Blower

Size

Total

Unit

Max

Over-current

protect

AFUE

Min.Wire Size
(awg) @ 75 ft.

one way

Air Temp.

Operation

Rise

Wt.

Unitary Products Group 3