Lennox Elite Gas Furnace Manual

The Lennox Elite Gas Furnace is a high-efficiency heating system designed for residential use, featuring advanced combustion technology, variable-speed blower motors, and smart thermostat compatibility. With AFUE ratings up to 98.7%, it provides reliable heating while minimizing energy consumption. Below are key sections for safety, features, installation, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: Duralok Plus heat exchanger, variable-speed blower motor, direct spark ignition, pressure switches, flame sensor, and smart thermostat compatibility.

Installation Requirements

Professional installation required. Ensure proper clearances and venting.

1. Location: Install in dry, well-ventilated area with proper clearances (see specifications).
2. Venting: Use approved PVC piping for intake and exhaust; maintain proper slope.
3. Gas Connection: Use black iron pipe with proper sizing; pressure test required.
4. Electrical: 120V AC power supply with proper grounding; dedicated circuit recommended.
5. Ductwork: Ensure proper sizing and sealing for optimal performance.

WARNING! Gas furnaces produce carbon monoxide; proper installation and venting are critical for safety. Installation must be performed by qualified HVAC technician.

First-Time Setup

Initial startup must be performed by qualified technician.

1. System Check: Verify all connections, gas pressure, and electrical wiring.
2. Venting Verification: Confirm proper draft and combustion air supply.
3. Gas Pressure Adjustment: Set manifold pressure according to specifications.
4. Blower Speed Settings: Configure for proper airflow and temperature rise.
5. Thermostat Configuration: Program heating cycles and temperature settings.

CAUTION! Never attempt to adjust gas pressure or electrical settings without proper training and equipment.

Technical Specifications

• Model Series: EL296V, EL297V, EL298V
• Heating Capacity: 40,000 to 120,000 BTU/h
• AFUE Rating: Up to 98.7%
• Stages: Two-stage heating operation
• Blower Motor: Variable-speed ECM
• Gas Type: Natural gas (LP conversion kit available)
• Electrical: 120V AC, 60Hz, 15A circuit
• Venting: PVC, CPVC, or ABS (2" or 3")
• Sound Level: As low as 68 dBA
• Warranty: Limited lifetime heat exchanger, 5-year parts

Controls and Settings

Integrated control board with LED status lights and diagnostic codes.

Thermostat Controls: Heating setpoint, fan operation (auto/on), system mode (heat/off)

Control Board: LED status lights indicate system operation and fault codes. Blower Speed Settings: Adjustable for heating and continuous fan operation. Gas Valve: Two-stage operation for high and low fire settings. Limit Switches: High-temperature protection. Pressure Switches: Verify proper venting operation.

Venting and Combustion Air

Direct vent system with separate intake and exhaust.

1. Vent Pipe: Use approved PVC, CPVC, or ABS piping.
2. Clearances: Maintain required distances from combustible materials.
3. Terminations: Install vent caps according to local codes and manufacturer specifications.
4. Slope: Ensure proper drainage away from furnace.
5. Combustion Air: Provide adequate fresh air supply for proper combustion.

Tip: Regular inspection of venting system is essential for safe operation.

Operation and Maintenance

Regular maintenance ensures optimal performance and efficiency.

1. Startup Sequence: Thermostat call for heat initiates pre-purge, ignition, and burner operation.
2. Normal Operation: Two-stage heating provides precise temperature control.
3. Shutdown: Burners shut off followed by post-purge cycle.
4. Filter Replacement: Replace air filters every 1-3 months depending on usage.
5. Annual Maintenance: Professional inspection and cleaning recommended annually.
6. Blower Maintenance: Keep blower assembly clean and lubricated as needed.
7. Heat Exchanger Inspection: Visual inspection for cracks or damage during service.
8. Vent System: Check for obstructions and proper operation.

WARNING! Never operate furnace without proper air filter installed.

Safety Features

Multiple safety systems protect against hazardous conditions.

Flame Rollout Switches: Detect improper burner operation. High Limit Switches: Prevent overheating. Pressure Switches: Ensure proper venting. Flame Sensor: Verifies burner ignition. Gas Valve: Automatic shutoff in case of system fault. Carbon Monoxide Detection: Install CO detectors in living areas.

Care & Maintenance Schedule

Regular maintenance is essential for safety and efficiency.

Monthly: Check air filter, replace if dirty

Annually (Professional Service): Clean burners and heat exchanger, inspect heat exchanger for cracks, check gas pressure and connections, verify venting system, test safety controls, lubricate blower motor if required, check electrical connections

CAUTION! Always turn off power and gas supply before performing any maintenance.

Regulatory Information

ANSI Z21.47: Certified for natural gas operation. CSA International: Approved for safety standards. UL Listed: Electrical components certified. For proper installation, follow all local building codes and regulations. Copyright © 2024 Lennox Industries Inc. For support, visit www.lennox.com or contact 1-800-9-LENNOX.

Troubleshooting

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

Service: 1-800-9-LENNOX; www.lennox.com