Lennox Elite Series Gas Furnace Manual 1998

The Lennox Elite Series Gas Furnace from 1998 is a high-efficiency residential heating system featuring advanced combustion technology, electronic ignition, variable-speed blower motor, and multiple safety controls. This upflow furnace is designed for natural gas operation with AFUE ratings up to 90%, featuring diagnostic LED indicators, multi-speed operation, and compatibility with various thermostat systems. Below are key sections for safety, features, installation, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: Heat exchanger, gas valve, inducer motor, blower assembly, control board, pressure switches, flame sensor, and diagnostic LED.

Installation Requirements

Professional installation required. Verify local codes and obtain permits.

1. Location: Install in clean, dry area with adequate clearance for service.
2. Venting: Use approved PVC or metal venting materials per local codes.
3. Gas Supply: Connect to natural gas line with approved black iron pipe.
4. Electrical: Connect to 120V AC power with proper grounding.
5. Ductwork: Ensure proper return and supply air duct connections.

WARNING! Gas furnaces produce carbon monoxide; proper venting is critical. Installation must comply with NFPA 54 and local codes.

First-Time Startup

Qualified technician must perform initial startup and commissioning.

1. Verify installation: Check all connections, clearances, and venting.
2. Gas pressure: Set manifold pressure to 3.5" WC for natural gas.
3. Electrical: Verify proper voltage and grounding.
4. Start sequence: Initiate heating cycle and monitor operation.
5. Combustion analysis: Verify proper CO levels and efficiency.

CAUTION! Never operate furnace without proper venting. Carbon monoxide poisoning can occur.

Technical Specifications

• Input Capacity: 60,000 - 120,000 BTU/h (model dependent)
• AFUE Rating: Up to 90% Annual Fuel Utilization Efficiency
• Gas Type: Natural Gas (convertible to LP with kit)
• Electrical: 120V AC, 60Hz, 5-8 amps
• Blower Motor: Variable-speed ECM
• Venting: PVC, CPVC, or ABS (2" or 3" diameter)
• Static Pressure: 0.1" to 0.8" WC maximum
• Operating Temp Range: 45°F to 120°F ambient
• Warranty: 20-year heat exchanger, 5-year parts

Controls and Settings

Integrated control board with dip switch settings for configuration.

Thermostat: Compatible with standard 24V thermostats. Heat/cool/fan operation.

DIP Switch Settings: Blower delays, fan speeds, thermostat type. Gas Valve: Manual shutoff valve, pressure regulator. Limit Controls: High temperature limits for safety. Pressure Switches: Verify inducer operation and venting. Diagnostic LED: Flash codes for error diagnosis (1-7 flashes indicating specific faults).

Venting and Combustion Air

Direct vent or conventional venting options available.

1. Direct Vent: Use concentric or separate PVC pipes through wall.
2. Conventional: Metal B-vent through roof with proper clearance.
3. Combustion Air: Provide adequate fresh air per installation requirements.
4. Vent Length: Maximum 50 feet equivalent with two 90° elbows.

Tip: Vent pipes must slope back to furnace for condensate drainage.

Operating Instructions

Normal operation controlled by thermostat.

1. Set thermostat to desired temperature above room temperature.
2. Furnace will initiate ignition sequence: inducer starts, pressure switch closes, igniter glows, gas valve opens.
3. Flame sensor confirms ignition, main burners operate.
4. Blower starts after heat exchanger warm-up delay.
5. Cycle completes when thermostat satisfied.
6. For continuous fan, set thermostat to "FAN ON" position.

WARNING! Never adjust gas pressure or bypass safety controls. Qualified service only.

Maintenance Procedures

Annual maintenance required for safe, efficient operation.

1. Monthly: Check and replace air filter as needed.
2. Annual: Professional inspection and cleaning.
3. Burner inspection: Clean burners and verify flame pattern.
4. Heat exchanger: Inspect for cracks or corrosion.
5. Vent system: Verify clear and unobstructed.
6. Electrical: Check connections and component operation.

CAUTION! Turn off gas and electrical power before servicing.

Safety Features

Multiple safety systems protect against hazardous conditions.

Regulatory Information

UL listed and ANSI Z21.47 compliant. Manufactured to meet 1998 efficiency standards. CSA certified for US and Canada. This appliance must be installed in accordance with local codes, or in the absence of local codes, with the National Fuel Gas Code, ANSI Z223.1/NFPA 54. For technical support, contact Lennox Industries Inc. at 1-800-9-LENNOX or visit www.lennox.com.

Troubleshooting Guide

Reset Procedure: Turn thermostat off, turn furnace power off for 30 seconds, restore power, turn thermostat on.

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