Goodman 2 Stage Furnace Manual

The Goodman 2 Stage Furnace is a high-efficiency heating system featuring two-stage gas valve operation, variable-speed blower motor, electronic ignition, built-in diagnostics, and compatibility with various thermostat systems. Designed for residential use with AFUE ratings up to 98%, this furnace provides quiet operation and energy-efficient heating. Below are key sections for safety, features, installation, setup, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: Two-stage gas valve, variable-speed ECM blower motor, hot surface ignitor, flame sensor, pressure switches, control board with diagnostic LEDs.

Installation Requirements

Professional installation recommended. Verify local codes and obtain permits.

1. Location: Install in dry, clean area with proper clearance and ventilation.
2. Gas connection: Use approved gas piping; pressure test for leaks.
3. Electrical: 120V AC power supply with proper grounding.
4. Venting: Use approved PVC or metal venting materials.
5. Ductwork: Ensure proper sizing and sealing.
6. Condensate drain: Install drain line with proper slope.

WARNING! Gas appliances can be dangerous; installation by qualified technician required. Ensure proper combustion air and venting.

First-Time Setup

After installation, perform initial startup procedure.

1. Verify all connections: Gas, electrical, venting, and condensate.
2. Set thermostat: Install compatible two-stage thermostat.
3. Power on: Turn on electrical power and gas supply.
4. Test operation: Run through complete heating cycle.
5. Check airflow: Verify proper airflow at registers.
6. Monitor operation: Observe for proper cycling and temperature rise.

CAUTION! Never bypass safety controls. If furnace fails to operate properly, shut off power and gas immediately.

Technical Specifications

• Input Capacity: 40,000 - 120,000 BTU/h (varies by model)
• AFUE Rating: Up to 98% efficiency
• Stages: Two-stage heating operation
• Blower Type: Variable-speed ECM motor
• Ignition: Hot surface electronic ignition
• Gas Type: Natural or LP gas (conversion kit required)
• Electrical: 120V AC, 60Hz
• Venting: PVC, CPVC, or ABS required
• Sound Level: As low as 65 dB
• Warranty: Limited lifetime heat exchanger, 10-year parts

Controls and Settings

Access control board via front panel. LED status lights indicate system operation.

Control Board: POWER switch, diagnostic LEDs, dip switch settings, terminal connections.

Stage Operation: Low fire (65% capacity) for mild weather, high fire (100%) for cold weather. Blower Control: Variable speed adjusts airflow based on heating demand. Diagnostic Codes: LED flash patterns indicate specific fault conditions. Dip Switches: Configure heating stages, blower delays, and other operational parameters.

Thermostat Configuration

Compatible with two-stage heating thermostats. Wiring: Standard thermostat connections (R, W, W2, G, Y, C).

1. Turn off power before wiring thermostat.
2. Connect wires according to terminal designations.
3. Configure thermostat for two-stage operation.
4. Set temperature differential and cycle rates.
5. Test stage operation and temperature control.

Tip: Use programmable thermostat for optimal energy savings and comfort.

Operating Modes

Two-stage heating provides efficient temperature control.

1. Low Stage: Operates at reduced capacity for moderate heating needs.
2. High Stage: Full capacity operation for extreme cold conditions.
3. Blower Operation: Variable speed adjusts based on heating stage.
4. Ignition Sequence: Purge, ignition trial, flame establishment.
5. Safety Monitoring: Continuous monitoring of all safety devices.
6. Shutdown: Proper cool-down cycle before blower stops.

WARNING! Never operate furnace with access panels removed. Keep combustible materials away from furnace.

Maintenance Procedures

Regular maintenance ensures optimal performance and safety.

1. Monthly: Check air filter; replace when dirty.
2. Seasonal: Inspect burners, heat exchanger, and venting.
3. Annual: Professional inspection and cleaning recommended.
4. Blower Maintenance: Clean blower wheel and housing annually.
5. Drain System: Clear condensate drain line and trap.
6. Electrical: Check all connections and components.

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

Safety Features

Multiple safety systems protect against hazardous conditions.

Regulatory Information

UL listed and ANSI certified. Complies with applicable safety standards. Natural gas models certified to ANSI Z21.47/CSA 2.3. Installation must comply with National Fuel Gas Code (NFPA 54) and local codes. Manufactured by Goodman Manufacturing Company, L.P. For technical support, contact 1-877-466-8626 or visit www.goodmanmfg.com.

Troubleshooting

Reset: Turn power off for 30 seconds, then restore. If problem persists, call for service.

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