Goodman Natural Gas Furnace Manual

The Goodman Natural Gas Furnace is a high-efficiency heating system designed for residential use, featuring advanced combustion technology, multiple safety controls, variable-speed blower motor, electronic ignition system, and compatibility with standard thermostat controls. Available in various BTU capacities with AFUE ratings up to 96%. Below are key sections for safety, features, installation, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: Heat exchanger, burners, inducer motor, blower assembly, gas valve, control board, pressure switches, flame sensor, and limit switches.

Installation Requirements

Professional installation required. Verify local codes and obtain permits.

1. Location: Install in dry, clean area with adequate clearance and combustion air.
2. Gas Connection: Use black iron pipe with proper sizing; pressure test required.
3. Electrical: 120V AC power with proper grounding; dedicated circuit recommended.
4. Venting: PVC pipe for intake and exhaust; maintain proper slope for condensate.
5. Drain Line: Install condensate drain with trap and proper routing.

WARNING! Gas appliances can be hazardous; installation must comply with all local codes and manufacturer specifications. Only qualified technicians should perform installation.

First-Time Setup

Initial startup must be performed by qualified technician.

1. System Check: Verify all connections, clearances, and venting.
2. Gas Pressure: Adjust manifold pressure to specifications on rating plate.
3. Electrical: Verify proper voltage and grounding.
4. Thermostat: Connect compatible thermostat; set to heat mode.
5. Test Operation: Start system and verify proper ignition sequence.
6. Combustion Analysis: Measure flue gases for proper CO levels and efficiency.

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

Technical Specifications

• Input Capacity: 40,000 to 120,000 BTU/hr
• AFUE Rating: Up to 96% efficiency
• Gas Type: Natural Gas (may require conversion kit for LP)
• Gas Pressure: 3.5" WC natural gas; 10" WC LP gas
• Electrical: 120V AC, 60Hz, 1.5-5.0 amps
• Static Pressure: 0.1" to 0.8" WC maximum
• Venting: 2" or 3" PVC depending on model and length
• Sound Level: 65-75 dB depending on model
• Warranty: Limited lifetime heat exchanger, 10-year parts

Controls and Settings

Integrated control board with diagnostic LEDs and DIP switch settings.

Control Board: POWER, STATUS LED (green), FAULT LED (red), RESET button, DIP switches.

Thermostat Connections: R (24V), C (common), W (heat), G (fan), Y (cool if applicable). DIP Switch Settings: Blower speed (HEAT/COOL), fan delay, accessory control. Status Lights: Green (normal operation), Red (fault code - refer to blinking pattern). Gas Valve: Manual shutoff valve with pressure test ports.

Venting and Combustion Air

Direct vent system with separate intake and exhaust. PVC pipe required.

1. Vent Length: Maximum 60 feet equivalent length (consult manual for specific model).
2. Pipe Size: 2" or 3" Schedule 40 PVC depending on furnace size.
3. Termination: Maintain proper clearances from windows, doors, and air intakes.
4. Slope: 1/4" per foot toward furnace for condensate drainage.
5. Combustion Air: Ensure adequate fresh air supply for proper combustion.

Tip: Always use PVC primer and cement for all joints; test for leaks after installation.

Operation Instructions

Normal operation controlled by thermostat.

1. Startup: Thermostat calls for heat, inducer motor starts, pressure switch proves draft.
2. Ignition: Hot surface igniter glows, gas valve opens, burner ignition occurs.
3. Heating: Flame sensor confirms ignition, main burners heat heat exchanger.
4. Blower: Blower motor starts after heat exchanger warms (fan delay).
5. Shutdown: Thermostat satisfied, gas valve closes, blower continues for cool-down.
6. Cycle: System ready for next heating call.

WARNING! If you smell gas, immediately turn off gas supply, evacuate area, and call gas company or fire department.

Maintenance Procedures

Annual professional maintenance recommended; monthly homeowner tasks.

Homeowner Tasks: Replace air filter monthly during heating season, keep area clean, verify vents are clear.

Professional Service: Clean burners and heat exchanger, check gas pressure, test safety controls, clean condensate system, verify combustion efficiency.

Safety Features

Multiple safety systems protect against hazardous conditions.

Regulatory Information

ANSI Z21.47/CSA 2.3: Certified for natural gas operation. UL listed. Complies with U.S. Department of Energy efficiency standards. Manufactured to meet or exceed ASHRAE standards. For technical support, contact Goodman Manufacturing at 1-877-466-8626 or visit www.goodmanmfg.com.

Troubleshooting

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

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