Lennox EL296V Furnace Manual

The Lennox EL296V is a high-efficiency, two-stage gas furnace with variable-speed blower motor, achieving up to 96% AFUE efficiency. Features include ComfortSync™ technology, precise temperature control, quiet operation, durable aluminized steel heat exchanger, diagnostic LED lights, and compatibility with Lennox iComfort® thermostats. Below are key sections for safety, features, installation, setup, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: Variable-speed blower motor, two-stage gas valve, aluminized steel heat exchanger, diagnostic LED, pressure switch, flame sensor, igniter, and filter access panel.

Installation

Unpack and inspect contents. Ensure proper location with adequate clearance.

1. Position furnace: Place on stable, level surface with proper clearances (minimum 1 inch from combustible materials).
2. Connect gas line: Use approved gas piping and fittings; pressure test for leaks.
3. Connect electrical: 120V AC power supply with proper grounding.
4. Connect venting: Use approved PVC piping for intake and exhaust.
5. Connect thermostat: Use appropriate wiring for iComfort or standard thermostat.
6. Install filter: Insert proper size filter in filter rack.

WARNING! Gas furnaces produce carbon monoxide; ensure proper venting. Installation must comply with local codes and be performed by qualified technician.

First-Time Setup

Power on furnace; follow startup sequence.

1. Verify gas supply: Ensure gas valve is open and pressure is correct.
2. Check electrical: Confirm proper voltage and grounding.
3. Set thermostat: Configure iComfort thermostat or compatible control.
4. Test operation: Initiate heating cycle and verify proper ignition.
5. Check airflow: Ensure proper air delivery through registers.
6. Monitor diagnostics: Observe LED for normal operation code.

CAUTION! Never bypass safety controls. If furnace fails to start properly, shut off power and gas, then consult troubleshooting section.

Specifications

• AFUE Rating: Up to 96% efficiency
• Stages: Two-stage heating operation
• Blower Type: Variable-speed ECM motor
• Heat Exchanger: Aluminized steel construction
• Input BTU/h: 40,000 to 120,000 (model dependent)
• Gas Type: Natural gas (LP conversion kit available)
• Electrical: 120V AC, 60Hz, 15 amp circuit
• Venting: PVC pipe (2-inch minimum)
• Sound Level: As low as 68 dBA
• Warranty: Limited lifetime heat exchanger warranty

Controls and Settings

Access controls via thermostat or furnace control board. Control Board: POWER switch, diagnostic LED, dip switches.

Thermostat: HEAT/COOL/OFF mode, temperature setpoint, fan control, system status.

Operating Modes: HEAT (two-stage), COOL (with AC), FAN ON/AUTO. Diagnostic Codes: LED flashes indicate specific error conditions. Dip Switches: Configure blower speeds, staging delays, accessory options. Safety Controls: Limit switches, pressure switches, flame rollout protection.

Connecting Thermostat

iComfort thermostat or standard 24V thermostat compatible.

1. Turn off furnace power at disconnect switch.
2. Remove old thermostat and label wires.
3. Mount new thermostat base and connect wires (R, C, W, Y, G).
4. Configure thermostat settings for furnace type.
5. Restore power and test operation.

Tip: For iComfort thermostat, follow on-screen setup wizard for optimal performance.

Operation Modes

Two-stage heating with variable-speed blower operation.

1. First Stage: Lower heat output for mild weather and energy savings.
2. Second Stage: Higher heat output for cold weather and rapid heating.
3. Blower Operation: Variable speed adjusts airflow for efficiency and comfort.
4. Ignition Sequence: Pressure switch check, inducer motor on, igniter heats, gas valve opens, flame sensor verification.
5. Shutdown: Gas valve closes, inducer runs for post-purge, blower continues for heat dissipation.

WARNING! Never operate furnace with access panels removed. Keep combustion area clear of debris.

Maintenance Procedures

Regular maintenance ensures optimal performance and safety.

1. Monthly: Check filter; replace if dirty.
2. Seasonal: Inspect vent pipes for obstructions.
3. Annual: Professional inspection of heat exchanger, burners, and safety controls.
4. As needed: Clean flame sensor with emery cloth.
5. Periodic: Verify proper gas pressure and combustion.

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

Care & Cleaning

Turn off power before cleaning. Use soft brush and vacuum for internal components.

CAUTION! Do not use water or liquid cleaners. Keep electrical components dry. Never spray chemicals into furnace.

Regulatory Information

ANSI Z21.47: Certified for natural gas operation. CSA International: Complies with North American safety standards. UL listed components. For support, visit www.lennox.com or contact 1-800-9-LENNOX. Installation must comply with National Fuel Gas Code (NFPA 54) and local building codes.

Troubleshooting

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

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