goodman furnace manual pdf

The Goodman furnace is a high-efficiency gas heating system designed for residential use, featuring advanced combustion technology, variable-speed blower motors, durable heat exchangers, and comprehensive safety controls. Available in various models with AFUE ratings up to 98%, these furnaces provide reliable heating performance with easy maintenance access and diagnostic LED indicators. Below are key sections for safety, features, installation, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: Stainless steel heat exchanger, variable-speed ECM blower motor, hot surface ignitor, flame sensor, pressure switches, and diagnostic control board.

Installation Requirements

Professional installation required. Verify local codes and obtain permits.

1. Location selection: Indoor, level surface with proper clearances and combustion air.
2. Gas connection: Use black iron pipe with sediment trap; pressure test for leaks.
3. Electrical: 120V AC power with proper grounding; install disconnect switch.
4. Venting: PVC pipe system for high-efficiency models; maintain proper slope.
5. Ductwork: Properly sized and sealed; install return air filter.

WARNING! Gas appliances can be hazardous; installation must comply with all codes. Carbon monoxide poisoning risk if improperly installed.

First-Time Setup

Initial startup must be performed by qualified technician.

1. Verify installation: Check all connections, clearances, and venting.
2. Gas pressure adjustment: Set manifold pressure per model specifications.
3. Electrical connections: Verify proper voltage and grounding.
4. System checkout: Test ignition sequence, flame operation, and safety controls.
5. Customer orientation: Explain thermostat operation and basic maintenance.

CAUTION! Never bypass safety controls. Ensure proper ventilation during operation.

Technical Specifications

• Models: GMVC96, GMEC96, GMS8, various sizes from 40,000 to 120,000 BTU
• AFUE Rating: Up to 98% for high-efficiency models
• Gas Type: Natural gas or LP (with conversion kit)
• Electrical: 120V, 60Hz, 1.5-7.5 amps depending on model
• Blower Motor: Variable-speed ECM, 3/4 to 1-1/2 HP
• Static Pressure: 0.1 to 0.9 inches water column
• Venting: PVC, CPVC, or ABS for high-efficiency models
• Warranty: Limited lifetime heat exchanger, 10-year parts
• Dimensions: Varies by model; typical 21"W x 21"D x 45"H

Controls and Settings

Integrated control board with diagnostic LED. Thermostat connections for conventional and communicating systems.

Control Board: LED status lights for normal operation and error codes. DIP switches for blower speed settings, gas type selection.

Thermostat: Compatible with most 24V systems. Wiring terminals: R, C, W, Y, G. Advanced features: Multi-stage heating, variable fan control, smart thermostat compatibility.

Venting and Ductwork

High-efficiency models use PVC venting; conventional models require metal flue.

1. Vent pipe sizing: Follow manufacturer specifications for pipe diameter and length.
2. Condensate drainage: Install neutralizer kit if required by local codes.
3. Duct design: Proper sizing critical for efficiency and performance.
4. Airflow: Minimum 400 CFM per ton of cooling capacity.

Tip: Ensure vent pipes are properly supported and sealed against weather.

Operating Instructions

Normal operation controlled by thermostat settings.

1. Thermostat setting: Set to HEAT mode and desired temperature.
2. Startup sequence: Inducer motor starts, pressure switch proves, ignitor heats, gas valve opens.
3. Flame establishment: Flame sensor confirms ignition, main blower starts after delay.
4. Shutdown: Gas valve closes, inducer continues for post-purge, blower runs for cool-down.
5. Continuous operation: Cycles automatically based on thermostat demand.

WARNING! Never operate without filter installed. Keep combustible materials away from furnace.

Maintenance Procedures

Regular maintenance ensures efficiency and longevity.

1. Monthly: Check and replace air filter as needed.
2. Annual professional service: Clean heat exchanger, check burners, verify gas pressure.
3. Blower maintenance: Clean blower wheel and housing annually.
4. Drain system: Flush condensate trap and lines each season.
5. Safety check: Test carbon monoxide detectors and furnace safety controls.

CAUTION! Turn off power and gas before performing any maintenance.

Safety Information

Carbon monoxide detectors required in home. Never block combustion air openings.

Emergency shutdown: Turn off gas valve and electrical power if abnormal operation detected.

Regulatory Compliance

ANSI Z21.47/CSA 2.3: Certified for US and Canadian standards. UL listed. Meets Department of Energy efficiency standards. For technical support, visit www.goodmanmfg.com or contact 1-877-466-8626.

Troubleshooting Guide

Reset: Power cycle unit to clear temporary lockouts.

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