Lennox Elite Furnace Installation Manual

The Lennox Elite Furnace is a high-efficiency gas furnace designed for residential heating applications. This installation manual covers proper installation procedures, safety guidelines, electrical connections, gas line connections, venting requirements, startup procedures, and maintenance guidelines for the Lennox Elite series furnaces. Below are key sections for safety, installation procedures, electrical connections, gas connections, venting, startup, and troubleshooting.

1. Safety Precautions 2. Installation Requirements 3. Electrical Connections 4. Gas Line Connections 5. Venting System 6. Startup Procedure 7. Operating Instructions 8. Maintenance Schedule 9. Technical Specifications 10. Troubleshooting Guide

Safety Precautions

Critical safety information for proper furnace installation and operation.

Hazard	Precaution
Gas Leaks	Check all connections with leak detection solution; never use open flame
Electrical Shock	Disconnect power before servicing; follow local electrical codes
Carbon Monoxide	Ensure proper venting; install CO detectors in living areas
Fire Hazard	Maintain proper clearances from combustible materials
Burn Hazard	Allow furnace to cool before servicing; wear protective gloves

Installation Requirements

Proper location and clearances for furnace installation.

Location: Install in dry, clean area with adequate combustion air and service access.
Clearances: Maintain minimum 1-inch clearance from combustible materials.
Leveling: Ensure furnace is level for proper condensate drainage.
Ductwork: Connect to properly sized and sealed duct system.
Drain Lines: Install condensate drain lines with proper slope.

WARNING! Failure to follow installation requirements may result in fire, explosion, or carbon monoxide poisoning.

Electrical Connections

Wiring and electrical requirements for proper furnace operation.

Power Supply: Connect to dedicated 120V, 15-amp circuit with proper grounding.
Thermostat Wiring: Use 18-gauge thermostat cable; follow wiring diagram.
Grounding: Ensure proper equipment grounding per local codes.
Low Voltage: Connect R, W, G, C terminals as specified.
High Voltage: Connect line voltage per unit rating plate.

CAUTION! All electrical work must be performed by qualified personnel following local codes.

Gas Line Connections

Proper gas line installation and leak testing procedures.

Gas Type: Natural gas or LP gas (conversion kit required for LP)
Pressure: Natural gas: 7" WC; LP gas: 11" WC
Pipe Size: Minimum 1/2" black iron pipe for natural gas
Shut-off Valve: Install manual gas shut-off valve within 6 feet
Drip Leg: Install sediment trap in gas line

WARNING! Always use leak detection solution to check for gas leaks; never use open flame.

Venting System

Proper venting installation for high-efficiency condensing furnace.

Vent Materials: Use only approved PVC or CPVC pipe for venting.

Vent Sizing: Follow manufacturer's specifications for pipe diameter and length.

Slope: Install condensate drain with 1/4" per foot slope toward drain.
Termination: Maintain proper clearances from windows, doors, and air intakes.
Supports: Secure vent pipes every 4 feet with proper hangers.
Sealing: Use approved primer and cement for all joints.

Startup Procedure

Step-by-step procedure for initial furnace startup.

Gas Pressure: Verify correct manifold gas pressure.
Electrical: Restore power to furnace and thermostat.
Thermostat: Set to heating mode and raise temperature above room temp.
Sequence: Observe proper ignition sequence and flame establishment.
Adjustments: Verify proper temperature rise across heat exchanger.
Safety: Test limit switches and rollout safety devices.

CAUTION! Only qualified technicians should perform startup procedures.

Operating Instructions

Normal furnace operation and user controls.

Control	Function
Thermostat	Set desired temperature; system operates automatically
Power Switch	Emergency shut-off located near furnace
Gas Valve	Manual shut-off for gas supply
Filter Access	Monthly filter inspection and replacement

Tip: Keep thermostat set to consistent temperature for optimal efficiency.

Maintenance Schedule

Recommended maintenance intervals for optimal performance.

Monthly: Check and replace air filter if dirty
Annual: Professional inspection and cleaning
Seasonal: Check vent system for obstructions
As Needed: Clean flame sensor and burners

WARNING! Only qualified technicians should perform internal furnace maintenance.

Technical Specifications

Input BTU: 40,000 - 120,000 BTU/hr (model dependent)
Efficiency: Up to 98% AFUE
Electrical: 120V, 60Hz, 15A circuit
Gas Connection: 1/2" NPT
Vent Size: 2" or 3" PVC/CPVC
Dimensions: Varies by model (check specific model data)
Warranty: Limited lifetime heat exchanger warranty

Troubleshooting Guide

Symptom	Possible Cause	Corrective Action
Furnace won't start	Power, thermostat, safety switch	Check power supply; verify thermostat setting; reset safety switches
No heat	Gas supply, igniter, flame sensor	Verify gas valve open; check igniter operation; clean flame sensor
Short cycling	Dirty filter, airflow, thermostat	Replace air filter; check for blocked vents; verify thermostat location
Unusual noises	Blower, inducer motor, ducts	Inspect blower wheel; check inducer motor; examine ductwork
Error codes	System faults	Refer to diagnostic chart; count LED flashes for specific code

Service: Contact authorized Lennox dealer for professional service.

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