Goodman Furnace Manual GME80905

The Goodman GME80905 is a high-efficiency gas furnace with 80,000 BTU input capacity, 80% AFUE rating, single-stage operation, multi-speed blower motor, electronic ignition, aluminized steel heat exchanger, and compatibility with standard thermostat systems. Designed for residential use with natural gas, it features safety controls, diagnostic LED, and easy service access. Below are key sections for safety, features, installation, setup, operation, and troubleshooting.

Features at a Glance

Key components: Aluminized steel heat exchanger, multi-speed direct drive blower, electronic hot surface ignition, integrated control board, pressure switch, flame sensor, diagnostic LED.

Installation

Unpack and inspect contents. Ensure proper location with adequate clearance.

1. Position furnace: Install on level surface with minimum clearances (6" sides, 24" front, 1" top).
2. Connect gas supply: Use black iron pipe with sediment trap; pressure test for leaks.
3. Connect electrical: 120V AC power supply with proper grounding.
4. Connect thermostat: Low voltage wiring to R, W, G, C terminals.
5. Connect venting: Category I vent system with proper slope.
6. Connect ductwork: Secure supply and return air connections.

WARNING! Gas furnace installation must be performed by qualified technician. Follow all local codes.

First-Time Setup

Power on furnace; verify proper operation.

1. Check gas connections: Use leak detection solution on all joints.
2. Verify electrical: Ensure proper voltage and grounding.
3. Set thermostat: Install batteries; program heating setpoints.
4. Test operation: Set thermostat above room temperature to initiate heating cycle.
5. Check airflow: Verify adequate supply and return airflow.
6. Monitor ignition: Observe proper burner ignition sequence.

CAUTION! Never bypass safety controls. Ensure proper combustion air supply.

Specifications

• Model: GME80905
• Input Capacity: 80,000 BTU/H
• AFUE Rating: 80%
• Gas Type: Natural Gas
• Stages: Single-stage heating
• Blower Speeds: Multi-speed
• Electrical: 120V AC, 60Hz
• Venting: Category I
• Dimensions: Standard upflow configuration
• Warranty: Limited lifetime heat exchanger

Controls and Settings

Access control board via front panel. Integrated control manages ignition sequence, blower operation, and safety monitoring.

Thermostat Connections: R (24V power), W (Heat), G (Fan), C (Common)

Blower Speed: Factory set for optimal airflow; adjustable via motor taps if needed. Gas Pressure: Factory set; verify during installation. Limit Settings: Factory calibrated for safe operation. Diagnostic Codes: LED flash patterns indicate system status and faults.

Connecting Systems

Gas Supply: 1/2" black iron pipe with shutoff valve. Electrical: 120V dedicated circuit. Thermostat: Standard 24V system. Venting: Category I metal vent pipe. Ductwork: Properly sized supply and return.

1. Turn off gas and electrical power before connecting.
2. Match pipe sizes and use proper thread sealant.
3. Verify vent pipe slope (1/4" per foot upward).
4. Secure all electrical connections with wire nuts.

Tip: Always pressure test gas lines before initial startup.

Operation

Single-stage heating operation with automatic fan control.

1. Startup: Thermostat calls for heat, control board initiates sequence.
2. Prepurging: Blower operates to clear combustion chamber.
3. Ignition: Hot surface igniter glows, gas valve opens.
4. Flame Detection: Flame sensor confirms burner ignition.
5. Heating: Main burner operates, blower starts after heat exchanger warms.
6. Shutdown: Thermostat satisfied, gas valve closes, blower continues for cool-down.

WARNING! Never operate without proper venting. Monitor for unusual sounds or odors.

Maintenance Features

Diagnostic LED: Displays error codes for troubleshooting. Filter Access: Standard 1" filter slot. Service Ports: Access panels for component inspection. Safety Controls: Multiple protection systems including limit switches and pressure sensors.

Care & Cleaning

Turn off power before maintenance. Replace air filter monthly during heating season. Clean burners and heat exchanger annually. Inspect vent system for obstructions.

CAUTION! Use only manufacturer-approved replacement parts. Keep combustion area clear of debris.

Regulatory Information

ANSI Z21.47: Certified for natural gas operation. UL Listed: Meets electrical safety standards. Manufactured to comply with U.S. efficiency standards. For technical support, contact Goodman Manufacturing at 1-877-466-8626 or visit www.goodmanmfg.com.

Troubleshooting

Reset: Turn power off for 30 seconds, then restore.

Service: 1-877-466-8626; www.goodmanmfg.com