Unitary products group GF8 SERIES Technical Manual
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Unitary products group GF8 SERIES Technical Manual

80 afue multi-position gas furnaces
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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
FOR DISTRIBUTION USE ONLY - NOT TO BE USED AT POINT OF RETAIL SALE
ISO 9001
Certified Quality
Management System
DESCRIPTION
These compact units (31-1/2" high) employ induced combus-
tion, reliable electronic ignition and high heat transfer heat
exchangers. The units may be factory shipped for upflow/hor-
izontal application and converted for downflow application.
These units may also be factory shipped for downflow appli-
cation 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, hori-
zontal-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, hori-
zontal-left and horizontal-right application
• Reliable, hot surface ignitor
• Integrated control module for simplicity and reliable, eco-
nomical 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 add-
on 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
270846-UTG-A-0407

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Summary of Contents for Unitary products group GF8 SERIES

  • Page 1 These units are Category I listed and may be common vented GAS FURNACES with another gas appliance as allowed by the National Fuel Gas Code. MODELS: GF8 SERIES WARRANTY 20-year limited warranty on the heat exchanger. 4-POSITION 5-year limited parts warranty.

  • Page 2: Cabinet And Duct Dimensions

    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. Unitary Products Group...

  • Page 3: Ratings & Physical / Electrical Data - Upflow Models

    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. Unitary Products Group...

  • Page 4: Blower Performance

    1209 High 2570 2462 2361 2244 2128 1983 1826 1655 Med-High 2205 2105 2033 1952 1865 1738 1617 1459 GF8150D20UH11 Med-Low 1993 1931 1869 1880 1708 1590 1485 1330 1831 1782 1722 1660 1575 1477 1364 1231 Unitary Products Group...

  • Page 5: Return Air And Filters

    • 18” minimum height for return air box for bottom return only on Heating only applications with fur- nace in the upflow configuration. • 24” minimum height for return air box for bottom return only on A/C applications with furnace in the upflow configuration. Unitary Products Group...

  • Page 6: Filter Performance - Pressure Drop Inches W.c. And (Kpa)

    0.15 751 - 1000 0.05 0.05 0.20 1001 - 1250 0.10 0.10 0.20 1251 - 1500 0.10 0.10 0.25 1501 - 1750 0.15 0.14 0.30 1751 - 2000 0.19 0.18 0.30 2001 & Above 0.19 0.18 0.30 Unitary Products Group...

  • Page 7: Applying Filter Pressure Drop To Determine System Airflow

    24-1/2" "D" Cabinets 1BR0320BK This accessory conversion kit may be used to convert natural gas units for high altitude operation at altitudes from 2,000 to 8,000 ft. Conversion must be made by qualified distributor or dealer personnel. Unitary Products Group...
  • Page 8 NOTES Subject to change without notice. Printed in U.S.A. 270846-UTG-A-0407 Copyright © by York International Corp. 2007. All rights reserved. Supersedes: 265923-BTG-C-0806 Unitary 5005 Norman Products York Group Drive 73069...

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