Lennox Elite Series G23 Furnace Manual PDF

The Lennox Elite Series G23 Furnace is a high-efficiency gas furnace designed for residential heating applications. This two-stage furnace features variable-speed blower technology, durable heat exchanger construction, and advanced diagnostic controls. With AFUE ratings up to 96%, the G23 provides reliable, energy-efficient heating while maintaining quiet operation. Below are key sections covering safety, features, installation, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: Two-stage gas valve, variable-speed blower motor, durable heat exchanger, integrated control board, pressure switches, and diagnostic LED system.

Installation Requirements

Unpack and inspect all components. Ensure proper clearances and ventilation.

1. Location requirements: Install in approved locations with proper clearances to combustibles.
2. Venting system: Install proper PVC venting for high-efficiency operation.
3. Gas connection: Use approved gas piping materials and test for leaks.
4. Electrical connection: Connect to proper voltage with correct fuse/breaker protection.
5. Ductwork: Ensure proper sizing and sealing for optimal airflow.

WARNING! Installation must be performed by qualified HVAC technician. Gas appliances can be hazardous if improperly installed.

First-Time Setup

Power on furnace; follow startup sequence and verify proper operation.

1. System checkout: Verify all connections are secure and proper.
2. Gas pressure adjustment: Set manifold pressure according to specifications.
3. Blower speed settings: Adjust dip switches for proper airflow.
4. Thermostat configuration: Set up compatible thermostat for two-stage operation.
5. System testing: Run through complete heating cycle to verify operation.

CAUTION! Never bypass safety controls. Always verify proper combustion and venting.

Technical Specifications

• Model Series: G23Q2, G23Q3, G23Q4
• Input BTU/h: 40,000 - 120,000
• AFUE Rating: Up to 96%
• Stages: Two-stage heating
• Blower Type: Variable-speed ECM
• Gas Type: Natural gas or LP (with conversion kit)
• Voltage: 120V AC, 60Hz
• Venting: PVC pipe required
• Sound Level: Ultra-quiet operation
• Warranty: Limited lifetime heat exchanger warranty

Controls and Settings

Access control board via front panel. Integrated control manages all furnace functions.

Control Board: POWER switch, diagnostic LED, dip switches for blower settings, terminal strip for thermostat connections.

Operation: Two-stage heating control, variable-speed blower adjustment, safety lockout features. Settings: Blower speed dip switches, temperature rise verification, pressure switch monitoring. Diagnostics: LED flash codes for troubleshooting, system status indicators, lockout reset procedures.

Operating Instructions

Furnace operates automatically when thermostat calls for heat.

1. Thermostat call: Set thermostat to desired temperature above room temp.
2. Startup sequence: Inducer motor starts, pressure switches prove, igniter heats.
3. Ignition: Gas valve opens, burner ignites, flame sensor confirms.
4. Blower operation: Blower starts after heat exchanger warm-up delay.
5. Shutdown: Burners shut off when thermostat satisfied, blower continues for cool-down.

Tip: Maintain consistent thermostat settings for optimal efficiency.

Maintenance Procedures

Regular maintenance ensures optimal performance and longevity.

1. Air filter: Replace every 1-3 months depending on usage.
2. Burner inspection: Check for proper flame pattern and cleanliness.
3. Heat exchanger: Inspect annually for cracks or corrosion.
4. Blower assembly: Clean blower wheel and housing annually.
5. Venting system: Verify clear and unobstructed vent pipes.
6. Drain system: Clear condensate drain lines and trap.
7. Electrical: Check all connections and component operation.

WARNING! Always disconnect power before performing maintenance. Gas-related service requires qualified technician.

Safety Features

Multiple safety systems protect against hazardous conditions. Flame rollout switches, high limit switches, pressure switches, igniter safety timeout, control board diagnostics, gas valve safety shutoff.

Care & Cleaning

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

CAUTION! Never use water or liquid cleaners on electrical components. Keep area around furnace clear of combustible materials.

Regulatory Information

ANSI Z21.47: Certified for natural gas and LP operation. UL listed for safety. CSA certified for Canadian installations. Meets DOE efficiency standards. Copyright © Lennox Industries Inc. All rights reserved. For technical support, contact Lennox at 1-800-9-LENNOX or visit www.lennox.com.

Troubleshooting

Reset: Power cycle furnace to clear temporary lockouts.

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