Heil Furnace Repair Manual

The Heil Furnace is a high-efficiency heating system designed for residential and light commercial applications. This manual covers various Heil furnace models including gas and electric units, providing comprehensive information on installation, operation, maintenance, troubleshooting, and repair procedures. Below are key sections for safety, features, installation, setup, operation, and troubleshooting.

Features at a Glance

Key components: Heat exchanger, blower motor, gas valve, control board, ignition system, thermostat connection, air filter compartment, flue pipe connection.

Installation

Unpack and inspect all components. Ensure proper location with adequate clearance.

1. Position furnace: Place on level surface with minimum clearance requirements.
2. Connect gas line: Use approved gas piping with proper sizing and shutoff valve.
3. Connect electrical: 120VAC power supply with dedicated circuit and proper grounding.
4. Install venting: Use approved PVC or metal vent pipe per local codes.
5. Connect ductwork: Secure supply and return air ducts with proper sealing.

WARNING! Gas furnaces require professional installation. Ensure all connections are leak-tested and properly secured.

First-Time Setup

Complete installation verification before initial startup.

1. Check gas connections: Use leak detection solution on all joints.
2. Verify electrical: Ensure proper voltage and polarity.
3. Test venting: Confirm proper draft and clearances.
4. Configure thermostat: Set heating mode and desired temperature.
5. Initial startup: Follow lighting instructions for pilot or direct ignition.

CAUTION! Always follow manufacturer's startup sequence. Have fire extinguisher available during initial testing.

Specifications

• Heating Capacity: 40,000 - 120,000 BTU/H depending on model.
• Efficiency Rating: 80% AFUE to 96% AFUE models available.
• Electrical Requirements: 120V AC, 60Hz, 15 Amp circuit.
• Gas Type: Natural gas or propane (conversion kit required).
• Blower Motor: ECM or PSC, 1/3 to 1/2 HP.
• Filter Size: Standard 16x25x1 inch or custom sizes.
• Venting: Category I (metal) or Category IV (PVC).
• Operating Temp Range: -30°F to 120°F ambient.

Controls and Settings

Access control board via front panel removal. Integrated diagnostic LED for error codes.

Thermostat: HEAT/COOL/OFF mode, FAN AUTO/ON, temperature setting, system switch.

Control Board: Diagnostic LED (flash codes), reset button, terminal strip. Gas Valve: Pressure adjustment, manual shutoff. Blower Settings: Speed taps for heating/cooling, delay adjustments. Limit Controls: High limit switch, roll-out switch settings. Safety Features: Pressure switches, flame sensor, ignition control.

Connecting Components

Thermostat: Standard 5-wire or 8-wire connection. Gas Line: Black iron pipe with sediment trap. Electrical: Line voltage and low voltage connections.

1. Turn off power and gas supply before making connections.
2. Match wire colors to terminal designations (R, W, Y, G, C).
3. Use proper pipe compound on gas connections (gas-rated only).
4. Secure all electrical connections with wire nuts.

Tip: Label all wires before disconnecting for easy reconnection.

Operating Procedures

Supports automatic and manual operation modes.

1. Startup: Set thermostat to HEAT mode above room temperature.
2. Normal Operation: Furnace cycles automatically based on thermostat demand.
3. Fan Operation: Use FAN ON for continuous circulation.
4. Shutdown: Set thermostat to OFF or lower temperature setting.
5. Emergency Shutoff: Use gas valve shutoff or electrical disconnect.
6. Diagnostic Mode: Check LED flash codes for system status.
7. Reset Procedure: Power cycle for lockout conditions.
8. Seasonal Startup: Professional inspection recommended.

WARNING! Never bypass safety controls. If furnace locks out repeatedly, call for professional service.

Maintenance Features

Air Filter: Replace every 1-3 months. Flame Sensor: Annual cleaning recommended. Heat Exchanger: Professional inspection annually. Blower Assembly: Lubrication and cleaning as needed.

Care & Cleaning

Turn off power before cleaning. Use soft brush and vacuum for dust removal. Clean flame sensor with fine sandpaper.

CAUTION! Do not use water or chemical cleaners on electrical components. Keep combustion area clear of debris.

Regulatory Information

ANSI Z21.47: Certified for gas-fired central furnaces. UL 1995: Standard for heating and cooling equipment. Local codes may apply for installation and venting requirements. Copyright © 2025 Heil Heating & Cooling Products; trademarks of International Comfort Products. For technical support, visit www.heil-hvac.com or contact 1-800-847-2186.

Troubleshooting

Reset: Power cycle unit or press reset button on control board.

Service: 1-800-847-2186; www.heil-hvac.com