Goodman Furnace Installation Manual GKS9

The Goodman GKS9 is a high-efficiency gas furnace designed for residential heating applications. This multi-speed furnace features AFUE ratings up to 96%, durable heat exchanger construction, easy installation with simplified wiring, and compatibility with various thermostat systems. Below are key sections covering safety precautions, installation procedures, wiring, startup, and maintenance guidelines.

Features at a Glance

Key components: Durable tubular heat exchanger, multi-speed blower motor, electronic ignition system, pressure switches, flame sensor, and integrated control board.

Safety Precautions

Critical safety information for installation and operation.

1. Turn off electrical power and gas supply before installation or service.
2. Install carbon monoxide detectors in living areas.
3. Ensure proper combustion air supply and venting.
4. Follow all local codes and manufacturer specifications.

WARNING! Failure to follow safety precautions may result in fire, explosion, property damage, personal injury, or death. Gas furnaces produce carbon monoxide - ensure proper venting.

Pre-Installation Requirements

Site preparation and requirements before installation.

1. Verify furnace size matches heating load calculation.
2. Ensure adequate clearance: 1" sides, 6" front, 24" top for service access.
3. Check gas supply: Natural gas with 7" WC inlet pressure.
4. Confirm electrical: 120V, 60Hz, dedicated 15-amp circuit.
5. Plan venting: PVC schedule 40 or 80 pipe for direct vent.

CAUTION! Installation must comply with National Fuel Gas Code NFPA 54/ANSI Z223.1 and local codes.

Specifications

• Model Series: GKS9
• AFUE: Up to 96%
• Input BTU/H: 40,000 - 120,000 (varies by model)
• Gas Type: Natural Gas
• Electrical: 120V, 60Hz, 15A circuit
• Blower Type: Multi-speed ECM
• Venting: PVC direct vent (2" intake/exhaust)
• Dimensions: Varies by model (typical: 21"W x 21"D x 40"H)
• Warranty: Limited lifetime heat exchanger, 10-year parts

Installation Procedures

Step-by-step furnace installation guide.

1. Position furnace: Level on solid base, maintain clearances.
2. Install filter rack: Ensure proper airflow direction.
3. Connect ductwork: Seal all joints with mastic or foil tape.
4. Mount furnace: Secure to floor or platform.
5. Install condensate drain: Trap and route to approved drain.

Tip: Use bubble level to ensure furnace is perfectly level for proper condensate drainage.

Electrical Wiring

Electrical connections and wiring requirements.

1. Disconnect power at service panel before wiring.
2. Connect line voltage: Black (hot), white (neutral), green (ground).
3. Connect thermostat: R, W, G, C terminals.
4. Connect humidifier/accessories if applicable.
5. Verify proper grounding per NEC requirements.

WARNING! All electrical work must be performed by qualified personnel following NEC and local codes.

Gas Line Connection

Gas piping and connection procedures.

1. Shut off gas supply at main valve.
2. Install sediment trap before gas valve connection.
3. Use approved pipe thread compound or tape.
4. Pressure test: 14" WC for 10 minutes (no drop).
5. Check manifold pressure: Adjust to specifications on rating plate.

CAUTION! Use soap solution to check for gas leaks at all connections. Never use open flame.

Venting System

Combustion air intake and flue gas exhaust installation.

1. Use PVC schedule 40 or 80 pipe approved for furnace venting.
2. Maintain minimum slope: 1/4" per foot toward furnace.
3. Keep intake and exhaust terminals at same pressure zone.
4. Maximum vent length: Consult installation tables for specific model.
5. Install condensate drain in vertical vent sections.

WARNING! Improper venting can cause carbon monoxide poisoning. Test vent system integrity before operation.

Startup and Commissioning

Initial startup procedure and system verification.

1. Verify all connections are secure and proper.
2. Restore electrical power and gas supply.
3. Set thermostat to heat mode above room temperature.
4. Observe ignition sequence: Inducer motor, pressure switch, igniter, gas valve, flame sensor.
5. Check temperature rise: Compare supply/return air temperatures to specifications.
6. Measure gas pressure and combustion analysis.

CAUTION! Complete combustion analysis required for proper operation and warranty validation.

Maintenance Guidelines

Routine maintenance for optimal performance and longevity.

• Monthly: Check and replace air filter as needed
• Annual: Professional inspection and cleaning
• Check burners and heat exchanger for corrosion
• Clean flame sensor with emery cloth
• Verify condensate drain flow and clear obstructions
• Lubricate blower motor if required (check manual)

Tip: Keep area around furnace clean and free of combustible materials.

Troubleshooting

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

Service: Contact qualified HVAC technician for complex issues.