Goodman GMH81405DN 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
TECHNICAL MANUTECHNICAL MANU
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Goodman GMH81405DN Series Specifications

General

Model	GMH81405DN Series
Efficiency	80% AFUE
Blower Motor	Multi-Speed
Non-Condensing	Yes
Blower Motor Type	PSC
Ignition Type	Hot Surface Ignition
Heat Exchanger Material	Aluminized Steel
Fuel Type	Natural Gas
Installation Type	Upflow/Horizontal
Stages	Single-stage
Warranty	10-year limited heat exchanger warranty

Summary

Product Identification

Product Design

General Operation

The GMH8 furnaces are equipped with an electronic ignition device used to light the burners and an induced draft blower to exhaust combustion products.

Location Considerations

Details regarding the placement of the furnace relative to its surroundings for safe and efficient operation.

Accessibility Clearances

Specifies the minimum required distances from the furnace to combustible materials for servicing.

High Altitude Derate

Explains the necessary adjustments and kits for operating the furnace at high altitudes.

Pressure Switch Trip Points & Usage

Details trip points and part numbers for square nose and round nose pressure switches.

T.O.D. Primary Limit Settings

Lists part numbers and open settings for T.O.D. primary limit controls across different models.

Rollout Limit Switches

Provides part numbers and open settings for rollout limit switches for various models.

Auxiliary Limit Switches

Lists part numbers and open settings for auxiliary limit switches for different furnace models.

Coil Matches

Details Goodman brand indoor coil compatibility with GMH8 furnaces using R22 and R-410A refrigerants.

Thermostats and Filters

Information on thermostat compatibility and required filter specifications for the furnace.

Dual Saver Configuration & Operation

Explains the heating modes (Single Stage, Modified Two-Stage) and dipswitch settings for the furnace.

Furnace Specifications

Blower Performance Specifications

Wiring Diagrams

Schematics