Goodman GMH80905CN 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 GMH80905CN Series Specifications

General

Brand	Goodman
Model	GMH80905CN Series
Category	Furnace
Language	English

Summary

Goodman TECHNICAL MANUAL

GMH8 39" 80% Gas Furnace Introduction

Overview of the GMH8 39" 80% Gas Furnace, including its features.

PRODUCT IDENTIFICATION

Model Number Structure and Breakdown

Explains the structure and components of the furnace model number.

PRODUCT IDENTIFICATION (continued)

Specific Model Numbers Listed

Lists specific model numbers for the GMH8 furnace series.

PRODUCT DESIGN

General Operation and Safety Warnings

Describes furnace operation, safety, and design principles.

PRODUCT DESIGN

Accessibility Clearances and High Altitude

Details minimum clearances and high altitude derating information.

COMPONENT IDENTIFICATION

Upflow/Horizontal Component Diagram

Identifies and labels major furnace components for upflow/horizontal.

PRODUCT DIMENSIONS

Furnace Dimensional Specifications

Provides physical dimensions and a table of model sizes.

PRESSURE SWITCH AND LIMIT SWITCH SPECIFICATIONS

Pressure Switch Trip Points

Lists trip points and part numbers for pressure switches.

Limit Switch Settings

Details settings and part numbers for primary, rollout, and auxiliary limits.

PRODUCT DESIGN

Coil Matches for Furnace

Information on matching indoor coils with the GMH8 furnace.

PRODUCT DESIGN

Thermostats and Filters

Discusses thermostat compatibility and filter requirements.

PRODUCT DESIGN

Dual Saver Configuration and Operation

Explains dual saver modes and dipswitch settings for operation.

FURNACE SPECIFICATIONS

Technical Data Table

Comprehensive technical specifications for GMH8 furnace models.

BLOWER PERFORMANCE SPECIFICATIONS

Blower Performance Data Tables

Detailed tables for blower CFM and temperature rise vs. static pressure.

BLOWER PERFORMANCE SPECIFICATIONS

Blower Performance Rise Chart

Graphical representation of blower output versus temperature rise.

WIRING DIAGRAMS

GMH8 Furnace Wiring Schematic

Electrical wiring diagram for the GMH8 furnace.

SCHEMATICS

Integrated Ignition Control Schematic

Typical schematic of the integrated ignition control system.