Lennox Pulse Furnace G14 Manual

The Lennox Pulse G14 is a high-efficiency gas furnace featuring pulse combustion technology, electronic ignition, variable-speed blower, and AFUE ratings up to 96%. This furnace is designed for residential heating applications with safety features including flame rollout switch, pressure switch, and limit controls. Below are key sections for safety, operation, maintenance, troubleshooting, and specifications.

1. Features at a Glance 2. Installation Requirements 3. Operation Instructions 4. Technical Specifications 5. Control Panel & Settings 6. Maintenance Procedures 7. Troubleshooting Guide 8. Safety Features 9. Parts List 10. Warranty Information 11. Service Contacts

Features at a Glance

Key components: Pulse combustion system, electronic controls, variable-speed blower motor, stainless steel heat exchanger, pressure switch, flame sensor, and integrated air filter system.

Feature	Description
Pulse Combustion	High-efficiency combustion technology
Variable-Speed Blower	Adjustable airflow for optimal comfort
Electronic Ignition	No standing pilot light
Stainless Steel Heat Exchanger	Durable corrosion-resistant construction
Integrated Air Filter	Standard 1-inch filter slot
Pressure Switch	Safety monitoring of combustion airflow
Flame Rollout Switch	Safety shutdown for flame abnormalities
Limit Control	Prevents overheating
Condensate Drain	Removes combustion byproducts
Gas Valve	Precise fuel control

Installation Requirements

Professional installation required. Verify local codes and obtain permits.

Location: Install in dry, well-ventilated area with proper clearances.
Venting: Use approved PVC or CPVC for concentric vent system.
Gas Supply: Connect to proper gas line with sediment trap.
Electrical: 120V AC power with proper grounding.
Drainage: Install condensate drain line with trap.

WARNING! Gas appliances can be hazardous; installation must be performed by qualified technician. Ensure proper combustion air and venting.

Operation Instructions

Set thermostat to desired temperature; furnace operates automatically.

Startup: Thermostat calls for heat, ignition sequence begins.
Pulse Operation: Gas-air mixture ignited in combustion chamber.
Heat Transfer: Heat exchanger warms circulating air.
Blower Operation: Variable-speed blower distributes heated air.
Shutdown: Thermostat satisfied, system shuts down.

CAUTION! Do not adjust gas valve or controls without proper training. Keep flammable materials away from furnace.

Technical Specifications

Model Series: G14
AFUE Rating: Up to 96%
Input BTU/h: 40,000 - 140,000 (varies by model)
Gas Type: Natural Gas
Electrical: 120V AC, 60Hz
Blower Motor: Variable-speed ECM
Heat Exchanger: Stainless Steel
Venting: PVC/CPVC concentric
Filter Size: 1-inch standard
Sound Level: < 65 dB

Control Panel & Settings

Integrated control board with LED status lights. Access panel must be removed for service.

Status Lights: Power, Heat, Blower, Service

Operating Modes: Heat, Fan Only, Off. Blower Settings: Continuous, Intermittent. Temperature Limits: Adjustable via dip switches. Service Codes: Flashing patterns indicate specific issues.

Maintenance Procedures

Annual maintenance required by qualified technician.

Filter Replacement: Monthly during heating season.
Heat Exchanger Inspection: Annual visual inspection.
Blower Cleaning: Remove debris from blower assembly.
Vent System: Check for obstructions annually.
Drain System: Clear condensate drain lines.
Gas Connections: Check for leaks annually.

Tip: Keep area around furnace clean and unobstructed.

Troubleshooting Guide

Symptom	Possible Cause	Corrective Action
No heat	Thermostat setting, power, gas supply	Check thermostat, circuit breaker, gas valve
Furnace not starting	Pressure switch, rollout switch	Check switch operation, venting
Blower not running	Motor, capacitor, control board	Check power to blower, capacitor condition
Short cycling	Filter, limit switch, airflow	Replace filter, check airflow, verify switch
Unusual noises	Blower, heat exchanger, venting	Inspect blower wheel, check for cracks

Reset: Power cycle furnace if safe to do so.

Service: Contact qualified technician for complex issues.

Safety Features

Multiple safety systems protect against hazardous conditions.

Flame Rollout Switch: Detects improper flame patterns
Pressure Switch: Verifies proper venting
Limit Control: Prevents overheating
Flame Sensor: Confirms burner ignition
Gas Valve: Automatic shutoff capability

WARNING! Never bypass safety devices. Carbon monoxide hazard possible with improper operation.

Parts List

Common replacement parts for G14 series.

Part Number	Description
10L26	Control Board
27W48	Igniter
35C62	Pressure Switch
41V45	Flame Sensor
47L56	Gas Valve
52M56	Blower Motor
62M46	Inducer Motor

Warranty Information

Limited warranties apply to components. Register product for full coverage.

Heat Exchanger: 20-year limited warranty
Parts: 5-year limited warranty
Labor: 1-year from installation

Warranty requires professional installation and proper maintenance. Keep installation receipts.

Service Contacts

For service and support contact authorized Lennox dealers.

Lennox Customer Support: 1-800-9-LENNOX

Website: www.lennox.com

Emergency Service: Contact local authorized dealer

Always use genuine Lennox replacement parts for optimal performance and safety.