Goodman Furnace GKS9 Installation Manual

The Goodman GKS9 is a high-efficiency gas furnace designed for residential heating applications, featuring AFUE ratings up to 96%, multi-speed blower motor, durable heat exchanger, electronic ignition, pressure switch, flame sensor, and compatibility with various thermostat systems. Below are key sections for safety, specifications, installation, wiring, startup, operation, and troubleshooting.

1. Features at a Glance 2. Safety Precautions 3. Installation Requirements 4. Specifications 5. Wiring and Electrical 6. Venting and Combustion Air 7. Gas Supply Connection 8. Startup and Commissioning 9. Maintenance 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Heat exchanger, blower assembly, gas valve, burners, pressure switch, flame sensor, control board, ventor motor.

Feature	Description
Heat Exchanger	Stainless steel primary and secondary heat exchangers
Blower Motor	Multi-speed ECM or PSC motor for airflow control
Gas Valve	Automatic gas valve with pressure regulation
Ignition System	Hot surface igniter for reliable startup
Pressure Switch	Ensures proper venting before ignition
Flame Sensor	Detects flame presence for safety shutdown
Control Board	Integrated furnace control with diagnostic LEDs
Ventor Motor	Induced draft blower for combustion gases
Air Filter	Standard 1-inch or 4-inch media filter compatibility
Thermostat Connections	Standard 24V connections for heating control

Safety Precautions

Read all instructions before installation. Follow local codes and manufacturer guidelines.

Disconnect electrical power before servicing.
Verify gas supply is turned off during installation.
Ensure proper venting to prevent carbon monoxide hazards.
Use correct tools and personal protective equipment.

WARNING! Failure to follow safety procedures may result in fire, explosion, or carbon monoxide poisoning. Installation must be performed by qualified HVAC technician.

Installation Requirements

Proper location and clearances are critical for safe operation.

Location: Indoor installation only, protected from weather and moisture.
Clearances: Minimum 1-inch clearance from combustible materials.
Foundation: Level, solid foundation capable of supporting furnace weight.
Access: Sufficient space for service access to all components.
Ductwork: Properly sized and sealed duct system.

CAUTION! Do not install in areas where flammable vapors may be present.

Specifications

Model Series: GKS9
AFUE Rating: Up to 96%
Input BTU/h: 40,000 - 120,000 (varies by model)
Gas Type: Natural Gas (LP conversion kit available)
Electrical: 115V/60Hz, 1.5-6.0 Amps
Static Pressure: 0.1-0.8 inches WC
Venting: Category IV, PVC pipe approved
Dimensions: Varies by model (check specific model data)
Weight: 85-145 lbs depending on model

Wiring and Electrical

Follow NEC and local electrical codes. Use proper wire sizing and circuit protection.

Electrical Connections: Line voltage (115V) to furnace, low voltage (24V) to thermostat.

Thermostat: R (24V), W (Heat), G (Fan), C (Common). Blower speeds: HEAT (low), COOL (high), FAN (medium). Grounding: Proper equipment grounding required. Circuit protection: Dedicated 15-amp circuit recommended.

Venting and Combustion Air

Category IV venting system required. PVC pipe commonly used.

Vent pipe sizing: 2-inch or 3-inch PVC depending on furnace size.
Vent length: Follow manufacturer tables for maximum length.
Combustion air: Provide adequate fresh air for combustion.
Termination: Proper termination clearances from windows and doors.

Tip: Slope horizontal vent pipes back toward furnace for condensate drainage.

Gas Supply Connection

Use black iron pipe or approved flexible connector.

Pipe sizing: Adequate for BTU input and length.
Gas pressure: Natural gas 3.5" WC, LP gas 10" WC.
Leak test: Test all connections with soap solution.
Sediment trap: Install at gas valve inlet.
Shutoff valve: Install manual gas shutoff valve.

WARNING! Never use matches or open flame to check for gas leaks.

Startup and Commissioning

Complete system checkout before initial operation.

Verify all connections: Electrical, gas, venting.
Check airflow: Proper filter installation, clean ducts.
Gas pressure: Set manifold pressure to specifications.
Combustion analysis: Verify proper combustion parameters.
Sequence of operation: Verify normal heating cycle.

CAUTION! Do not operate without proper venting and combustion air.

Maintenance

Regular maintenance ensures efficient and safe operation.

Monthly: Check and replace air filter as needed. Annual: Professional inspection including heat exchanger, burners, vent system, safety controls. Cleaning: Keep furnace area clean and free of debris.

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

Regulatory Information

UL certified. ANSI Z21.47 standards. CSA International. Installation must comply with National Fuel Gas Code NFPA 54/ANSI Z223.1 and National Electrical Code NFPA 70. For support, contact Goodman Manufacturing at 1-877-466-8626 or visit www.goodmanmfg.com.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Furnace won't start	Power, thermostat, door switch	Check circuit breaker, thermostat setting, door switch engagement.
No heat	Gas supply, igniter, pressure switch	Verify gas valve on, check igniter, test pressure switch.
Short cycling	Filter, airflow, limit switch	Replace filter, check for blocked vents, test limit switch.
Blower won't run	Motor, capacitor, control board	Check motor voltage, test capacitor, verify control signals.
Lockout mode	Safety device tripped	Reset power, check error codes, verify safety device operation.

Reset: Turn power off for 30 seconds then restore.

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