Luxaire Furnace GM9SO80C16UP11K Manual

The Luxaire GM9SO80C16UP11K is an 80,000 BTU high-efficiency gas furnace with 96% AFUE rating, two-stage heating operation, variable-speed blower motor, durable aluminized steel heat exchanger, direct spark ignition, pressure switch safety controls, multi-speed ECM motor, and compatibility with 2-inch PVC venting. Designed for residential forced-air heating systems with standard 120V AC power requirement. Below are key sections for safety, features, installation, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: Two-stage gas valve, variable-speed blower, aluminized steel primary heat exchanger, stainless steel secondary heat exchanger, direct spark ignition, pressure switches, flame sensor, inducer motor assembly.

Installation Requirements

Professional installation required. Verify local codes and obtain permits.

1. Location: Install in dry, clean area with adequate combustion air and service clearance.
2. Venting: Use 2-inch PVC for intake and exhaust; maintain proper slope and termination clearances.
3. Gas connection: Use approved black iron pipe with sediment trap; pressure test for leaks.
4. Electrical: Connect to dedicated 120V circuit; proper grounding required.
5. Ductwork: Ensure proper sizing and sealing; install cleanable filter.

WARNING! Gas appliances can be hazardous; installation must comply with all local codes and manufacturer specifications. Carbon monoxide hazard exists with improper installation.

First-Time Setup

Professional startup and commissioning required.

1. Verify installation: Check all connections, clearances, and venting.
2. Gas pressure: Set manifold pressure to 3.5" WC for natural gas.
3. Electrical: Verify proper voltage and polarity.
4. Thermostat: Connect compatible two-stage thermostat; configure staging.
5. Test operation: Run through complete heating cycle; verify proper ignition and airflow.
6. Commissioning: Measure temperature rise, gas pressure, combustion analysis.

CAUTION! Only qualified HVAC technicians should perform startup procedures.

Technical Specifications

• Model: GM9SO80C16UP11K
• Heating Capacity: 80,000 BTU/h input
• AFUE: 96%
• Stages: Two-stage heating
• Blower Type: Variable-speed ECM
• Motor Speeds: Multi-speed adjustable
• Heat Exchanger: Aluminized steel primary, stainless steel secondary
• Venting: 2-inch PVC
• Gas Type: Natural gas
• Electrical: 120V AC, 60Hz
• Dimensions: Standard upflow configuration
• Warranty: Limited lifetime heat exchanger, 10 years parts

Controls and Operation

Integrated furnace control board with LED status indicator. Two-stage operation for enhanced comfort and efficiency.

Control Board LED Codes: Steady green = normal operation; Slow flash = pressure switch error; Rapid flash = ignition failure; Off = no power.

Operation: Furnace communicates with thermostat for staging control. Low stage operates for mild weather, high stage for extreme cold. Variable-speed blower adjusts airflow for optimal performance and comfort.

Thermostat Configuration

Compatible with most two-stage heating thermostats.

1. Wiring: Connect R, C, W1, W2 terminals for two-stage operation.
2. Configuration: Set thermostat for two-stage heat with appropriate staging parameters.
3. Testing: Verify both stages activate properly during heating demand.

Tip: Use programmable thermostat for maximum energy savings.

Maintenance Procedures

Annual professional maintenance recommended.

1. Filter: Replace monthly during heating season; use MERV 8-11 filter.
2. Heat exchanger: Professional inspection annually for cracks or corrosion.
3. Burners: Clean and inspect for proper flame pattern.
4. Venting: Inspect PVC pipes for obstructions or damage.
5. Drain system: Clear condensate trap and drain line.
6. Electrical: Check connections and control board operation.

WARNING! Turn off gas and electrical power before servicing.

Safety Features

Multiple safety systems: Flame rollout switches, pressure switches, high-limit switches, flame sensor, igniter control.

Pressure switches: Verify proper venting before ignition. Flame rollout switches: Detect improper burner combustion. High-limit switches: Prevent overheating. Flame sensor: Confirms burner ignition. Ignition control: Safe start-up sequence.

Care & Cleaning

Regular maintenance ensures optimal performance and safety.

Monthly: Replace air filter. Annual: Professional cleaning of burners, heat exchanger, blower assembly, and drain system. Keep area around furnace clean and unobstructed.

CAUTION! Never operate without filter. Keep combustion air openings clear.

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 industry safety standards. For technical support, contact Luxaire at 1-855-583-8206 or visit www.luxaire.com.

Troubleshooting

Reset: Turn power off for 30 seconds then restore.

Service: 1-855-583-8206; www.luxaire.com