Lear Siegler Furnace Manual

The Lear Siegler Furnace is a high-efficiency residential heating system featuring advanced combustion technology, electronic ignition, variable-speed blower motor, multi-stage heating capability, built-in diagnostic system, safety shut-off controls, and energy-saving programmable thermostat compatibility. Designed for natural gas or propane operation with AFUE ratings up to 96%. Below are key sections for safety, features, installation, setup, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: Heat exchanger assembly, Burner system, Blower motor, Gas valve, Ignition control, Pressure switches, Limit controls, Diagnostic LED.

Installation Requirements

Unpack and inspect all components. Ensure proper clearances and level installation surface.

1. Location requirements: Minimum 1-inch clearance from combustible materials, level concrete pad or approved flooring.
2. Gas connection: Use approved gas piping with sediment trap; pressure test for leaks.
3. Electrical connection: 120V AC dedicated circuit with proper grounding.
4. Venting: Install PVC vent pipes per local codes with proper slope for condensation drainage.
5. Drain line: Connect condensate drain to approved drainage system.

WARNING! Installation must be performed by qualified HVAC technician. Gas leaks can cause explosion or fire.

First-Time Setup

Power on furnace; follow startup sequence.

1. System check: Verify gas supply, electrical power, and thermostat connections.
2. Initial ignition: System will perform self-check and attempt ignition sequence.
3. Temperature settings: Set desired temperature on compatible thermostat.
4. Blower speed: Adjust blower speed dip switches for proper airflow.
5. Gas pressure: Verify correct manifold pressure per specifications.

CAUTION! Do not bypass safety controls. Ensure proper ventilation during initial operation.

Technical Specifications

• Heating Capacity: 40,000-120,000 BTU/hr (model dependent)
• AFUE Rating: Up to 96% efficiency
• Fuel Type: Natural gas or propane (conversion kit required)
• Electrical: 120V AC, 60Hz, 5-10 amps
• Blower Motor: Variable-speed ECM, ½ to ¾ HP
• Static Pressure: 0.1-0.8 inches water column
• Gas Pressure: Natural gas: 3.5" WC; Propane: 10" WC
• Venting: 2" PVC required for high-efficiency models
• Operating Temp Range: -30°F to 120°F ambient
• Warranty: 20-year heat exchanger, 5-year parts

Controls and Settings

Access control board via front service panel. Thermostat connections: R, W, Y, G, C terminals.

Control Board: POWER switch, Diagnostic LED, Mode dip switches, Blower speed settings.

Operating Modes: HEAT, COOL (with AC), FAN ONLY. Blower Settings: Adjustable delay-on and delay-off timers. Temperature Control: Compatible with programmable thermostats for energy savings. Safety Controls: Automatic shut-off for high temperature, pressure failure, flame failure. Diagnostic Codes: LED flash patterns indicate specific error conditions.

Operating Instructions

Normal operation controlled by thermostat. Manual operation via service switch.

1. Thermostat operation: Set to HEAT mode and desired temperature.
2. Startup sequence: Inducer motor starts, pressure switch proves, igniter heats, gas valve opens.
3. Flame verification: Flame sensor confirms ignition, main burner operates.
4. Blower operation: Blower starts after heat exchanger warm-up delay.
5. Shutdown: Gas valve closes, inducer purges, blower continues cool-down cycle.

Tip: Keep thermostat away from heat sources and drafts for accurate temperature control.

Maintenance Procedures

Regular maintenance ensures efficiency and longevity.

1. Monthly: Check and replace air filter as needed.
2. Seasonal: Inspect burners, heat exchanger, and flame sensor.
3. Annual: Professional inspection of gas pressure, heat exchanger, venting, and safety controls.
4. Blower maintenance: Clean blower wheel and housing annually.
5. Drain system: Clear condensate drain line and trap monthly during heating season.
6. Venting: Inspect vent pipes for obstructions or damage.

WARNING! Turn off power and gas supply before performing any maintenance. Only qualified technicians should service gas components.

Safety Features

Multiple safety systems protect against hazardous conditions. Flame Rollout Switches: Shut off gas if flame escapes burner area. High Limit Switches: Cut power if temperature exceeds safe limits. Pressure Switches: Ensure proper venting before ignition. Flame Sensor: Shuts off gas if flame not detected. Ignition Control: Limited number of ignition attempts before lockout.

Care & Cleaning

Turn off power before cleaning. Use soft brush and vacuum for dust removal.

CAUTION! Do not use water or chemical cleaners on electrical components. Keep area around furnace clear of combustible materials.

Regulatory Information

ANSI Z21.47: Certified for safe operation. UL listed components. Meets DOE efficiency standards. CSA International certified for US and Canada. For technical support, contact Lear Siegler Technical Services at 1-800-555-HEAT or visit www.learsieglerfurnace.com. Copyright © 2024 Lear Siegler HVAC Systems.

Troubleshooting

Reset Procedure: Turn power off for 30 seconds, then restore. Check diagnostic LED for error codes.

Service: 1-800-555-HEAT; www.learsieglerfurnace.com