Lennox Electric Furnace Manual

The Lennox Electric Furnace is a high-efficiency heating system designed for residential use, featuring electric heating elements, multi-speed blower motor, integrated safety controls, thermal overload protection, and compatibility with various thermostat systems. Below are key sections for safety, features, installation, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: Electric heating elements, Blower assembly, Control board, Limit switches, Transformer, Filter rack, Service access panels.

Installation Requirements

Professional installation recommended. Ensure proper clearances and electrical requirements.

1. Location: Install in dry, level area with adequate clearance for service access.
2. Electrical: Requires dedicated 240V circuit with proper amperage rating.
3. Ductwork: Connect to properly sized and sealed duct system.
4. Venting: Ensure adequate combustion air and proper ventilation.
5. Thermostat: Install compatible 24V thermostat with appropriate wiring.

WARNING! Installation must comply with local codes and be performed by qualified technician. Electrical shock hazard exists.

First-Time Setup

Initial startup and configuration procedures.

1. Power connection: Verify proper electrical connections and circuit breaker rating.
2. Thermostat wiring: Connect R, W, G, C terminals as required.
3. System check: Verify all safety switches are closed and operational.
4. Initial startup: Set thermostat to heat mode and verify proper operation.
5. Airflow verification: Check blower operation and air delivery.

CAUTION! Always disconnect power before servicing. Verify proper grounding.

Technical Specifications

• Heating Capacity: 10kW to 30kW depending on model
• Voltage Requirements: 208/240V AC, 60Hz
• Blower Type: Multi-speed direct drive
• Airflow Capacity: 800-2000 CFM
• Temperature Rise: 35-70°F
• Filter Size: Standard 16x25x1 inch or custom sizes
• Safety Controls: Manual reset high limit, automatic thermal cutoff
• Operating Ambient: 32°F to 120°F
• Warranty: Limited lifetime heat exchanger, 5 years parts

Controls and Settings

Access control board via service panel. Thermostat controls heating operation.

Control Board: LED status indicators, DIP switch settings, terminal connections.

Heating Stages: Single or multi-stage operation based on model. Blower Settings: Adjustable delay-on and delay-off timers. Temperature Limits: Factory-set high limit protection. Diagnostic Codes: LED flash patterns for error identification.

Electrical Connections

Power supply and control wiring requirements.

1. Disconnect all power before making electrical connections.
2. Main power: Connect L1 and L2 to line voltage terminals.
3. Control circuit: Connect 24V transformer secondary to control board.
4. Thermostat: Connect R, W, G, C terminals as required.
5. Grounding: Ensure proper equipment grounding connection.

Tip: Use copper conductors only. Follow NEC requirements for wire sizing.

Operation Instructions

Normal heating operation and thermostat settings.

1. Power on: Ensure disconnect switch and circuit breaker are on.
2. Thermostat setting: Set to HEAT mode and desired temperature.
3. Heating cycle: Furnace will initiate heating when thermostat calls for heat.
4. Blower operation: Blower starts after heating element warm-up period.
5. Shutdown: System cycles off when thermostat satisfied.
6. Continuous fan: Set thermostat to FAN ON for continuous airflow.

WARNING! Do not operate with access panels removed. Keep flammable materials away.

Safety Features

Multiple safety systems protect against overheating and electrical hazards.

High Limit Switches: Automatic shutdown if temperature exceeds safe limits. Thermal Overload: Protects heating elements from overheating. Fusible Links: One-time thermal protection devices. Pressure Switch: Ensures proper airflow before heating. Door Safety Switch: Cuts power when service panels are removed.

Maintenance & Cleaning

Regular maintenance ensures optimal performance and longevity.

1. Filter replacement: Change every 1-3 months depending on usage.
2. Blower cleaning: Vacuum blower assembly annually.
3. Heating elements: Inspect for damage or corrosion yearly.
4. Electrical connections: Check for tightness and corrosion annually.
5. Ductwork: Inspect for leaks and proper insulation.

CAUTION! Always disconnect power before maintenance. Use only approved replacement parts.

Regulatory Information

UL listed and complies with ANSI/UL standards. Meets DOE energy efficiency requirements. Installation must comply with NEC, local electrical codes, and HVAC regulations. Copyright © Lennox Industries Inc. For technical support, contact Lennox customer service at 1-800-9-LENNOX or visit www.lennox.com.

Troubleshooting

Reset: Turn power off for 30 seconds then restore. Check for tripped limits.

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