Goodman High Efficiency Furnace Manual

The Goodman High Efficiency Furnace is a reliable heating system designed for optimal energy efficiency and performance. Featuring advanced combustion technology, variable-speed blower motors, and durable heat exchangers, this furnace provides consistent warmth while reducing energy costs. Below are key sections covering safety, features, installation, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: High-efficiency heat exchanger, variable-speed blower motor, electronic ignition system, multi-speed inducer motor, diagnostic LED system.

Installation Requirements

Professional installation required. Ensure proper clearances and venting.

1. Location: Install in well-ventilated area with proper clearances to combustibles.
2. Venting: Use approved PVC or CPVC for intake and exhaust vents.
3. Gas Connection: Use black iron pipe with proper sizing for BTU input.
4. Electrical: 120V AC power supply with proper grounding.
5. Drain Line: Install condensate drain with proper slope and trap.

WARNING! Installation must be performed by qualified HVAC technician. Improper installation can cause fire, explosion, or carbon monoxide poisoning.

First-Time Setup

Initial startup must be performed by qualified technician.

1. Verify all connections: Gas, electrical, venting, and drain lines.
2. Check gas pressure: Adjust manifold pressure to specifications.
3. Test safety controls: Verify limit switches, pressure switches, and rollout switches.
4. Commission system: Set blower speeds, check temperature rise, verify combustion.
5. Program thermostat: Set heating schedule and temperature preferences.

CAUTION! Never attempt to adjust gas pressure or combustion settings without proper training and equipment.

Technical Specifications

• Efficiency Rating: Up to 96% AFUE
• BTU Input: 40,000 to 120,000 BTU/h (model dependent)
• Gas Type: Natural gas or LP (conversion kit required)
• Electrical: 120V AC, 60Hz, 15A circuit
• Blower Motor: Variable-speed ECM
• Sound Level: As low as 65 dBA
• Venting: 2" PVC/CPVC for most applications
• Warranty: Limited lifetime heat exchanger, 10-year parts
• Operating Temp Range: -30°F to 120°F ambient

Controls and Settings

Integrated control board with diagnostic LED. Access via control panel cover removal.

Control Board: LED status lights, dip switches for configuration, test terminals.

Settings: Blower speeds (HEAT/COOL), temperature rise adjustment, timing delays. Diagnostic codes: Flash patterns indicate specific fault conditions. Thermostat compatibility: Standard 24V systems, compatible with most programmable thermostats.

Venting and Airflow

Direct vent system with separate intake and exhaust. Requires proper sizing and installation.

1. Vent Material: PVC or CPVC pipe only
2. Vent Length: Follow manufacturer's specifications for maximum run
3. Clearances: Maintain proper clearances to windows, doors, and air intakes
4. Airflow: Ensure proper return and supply duct sizing
5. Filters: Install correct size and MERV rating for system

Tip: Regular inspection of vent pipes for blockage or damage is essential for safe operation.

Operating Instructions

Normal operation controlled by thermostat. System includes automatic safety features.

1. Startup: Thermostat calls for heat, inducer motor starts, pressure switch verifies, ignition sequence begins
2. Heating: Gas valve opens, burner ignites, blower starts after warm-up delay
3. Shutdown: Thermostat satisfied, gas valve closes, blower continues for cool-down period
4. Safety: Multiple safety switches monitor temperature, pressure, and flame
5. Diagnostics: LED lights indicate normal operation or fault conditions

WARNING! If you smell gas, immediately shut off gas supply and call qualified service technician.

Maintenance Schedule

Regular maintenance ensures optimal performance and longevity.

Safety Features

Multiple safety systems protect against hazardous conditions.

• Flame Rollout Switches: Detect improper burner combustion
• High Limit Switches: Prevent overheating
• Pressure Switches: Verify proper venting operation
• Ignition Control: Monitors flame presence
• Gas Valve: Automatic shutoff in case of system fault

CAUTION! Never bypass safety controls. Always address the root cause of safety switch activation.

Regulatory Information

UL listed and ANSI certified. Complies with ASHRAE standards for residential gas furnaces. Manufactured to meet or exceed Department of Energy efficiency standards. For technical support or warranty service, contact Goodman Manufacturing at 1-877-466-8626 or visit www.goodmanmfg.com.

Troubleshooting

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

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