Goodman GMH80903BN Series User Manual

C
US
®
RT6621014 Rev. 2
June 2009
Copyright ©2006 - 2009 Goodman Manufacturing Company, L.P.
This manual is to be used by qualified, professionally trained HVAC technicians only.
Goodman does not assume any responsibility for property damage or personal
injury due to improper service procedures or services performed by an unqualified
person.
• Refer to Service Manual RS6610004 for installation, operation, and troubleshooting information.
• All safety information must be followed as provided in the Service Manual.
• Refer to the appropriate Parts Catalog for part number information.
• Model numbers listed on page 3.
GMH8 39" 80% Gas Furnace
80% AFUE, 2-Stage (Convertible),
Multi-Speed, Upflow/Horizontal
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Goodman GMH80903BN Series Specifications

General

Series	GMH8
Heating Capacity	90, 000 BTU
AFUE Rating	80%
Fuel Type	Natural Gas
Stages	Single Stage
Heat Exchanger Material	Aluminized Steel
Model	GMH80903BN
Weight	Varies by model
CFM	Varies by model and speed setting

Summary

Product Identification

Product Design: General Operation and Location

General Operation

Explains the basic functioning and safety features of the furnace.

Location Considerations

Details proper placement requirements for furnace installation.

Product Design: Clearances and Altitude

Accessibility Clearances

Specifies minimum clearances required for servicing the unit.

High Altitude Derate

Information on adjusting furnace performance for high-altitude installations.

Component Identification

Product Dimensions

Product Design: Switch Settings and Limits

Pressure Switch Trip Points and Usage

Details trip points and part numbers for pressure switches.

Primary Limit Settings

Specifies temperature settings for the primary limit control.

Rollout and Auxiliary Limit Switches

Lists settings and part numbers for limit switches.

Product Design: Coil Matching

Coil Matches

Information on compatible indoor coils for the furnace.

Product Design: Thermostats and Filters

Thermostat Compatibility

Notes on thermostat selection and specifications.

Filter Requirements

Details required filter types, sizes, and installation.

Product Design: Dual Saver Operation

Dual Saver Configuration and Operation

Explains the two-stage heating modes and dipswitch settings.

Furnace Specifications

Blower Performance Specifications

Blower Performance Specifications

Wiring Diagrams

Schematics