Lennox Pulse Furnace Manual PDF

The Lennox Pulse Furnace is a high-efficiency gas furnace featuring pulse combustion technology, electronic ignition, variable-speed blower, and advanced diagnostic systems. This manual covers safety precautions, installation guidelines, operation procedures, maintenance schedules, and troubleshooting for models G14, GSR14, and Pulse 21 series. Below are key sections for proper use and maintenance.

1. Safety Information 2. Installation Guidelines 3. Operating Instructions 4. Technical Specifications 5. Control System Overview 6. Maintenance Procedures 7. Troubleshooting Guide 8. Error Code Diagnostics 9. Parts Replacement 10. Warranty Information 11. Technical Support

Safety Information

Critical safety warnings and precautions for Lennox Pulse furnace operation and maintenance.

Hazard	Precaution
Gas leaks	Shut off gas supply immediately; ventilate area; do not operate electrical switches
High voltage	Disconnect power before servicing; capacitor discharge required
Hot surfaces	Allow furnace to cool before handling; wear protective gloves
Combustion gases	Ensure proper venting; install carbon monoxide detectors
Moving parts	Keep hands clear of blower wheel during operation

Installation Guidelines

Proper installation procedures for Lennox Pulse furnace models.

Location selection: Install in dry, well-ventilated area with adequate clearance
Gas connection: Use approved pipe thread compound; pressure test for leaks
Electrical wiring: Follow NEC codes; proper grounding required
Venting system: Use only approved PVC vent pipe; maintain proper slope
Drain line: Install condensate drain with trap; route to approved disposal

WARNING! Installation must comply with local codes and be performed by qualified technician.

Operating Instructions

Daily operation procedures and thermostat settings.

Startup sequence: Verify power and gas supply; set thermostat to heat mode
Normal operation: Furnace will initiate purge cycle followed by ignition
Temperature control: Use thermostat to set desired temperature range
Shutdown: Turn thermostat to off position; furnace will complete cool-down cycle
Seasonal startup: Perform safety checks before heating season

CAUTION! Do not attempt to override safety controls or bypass limit switches.

Technical Specifications

Models: G14, GSR14, Pulse 21 series
Input Capacity: 40,000-140,000 BTU/hr
AFUE Rating: Up to 96.7% efficiency
Gas Type: Natural gas or LP (with conversion kit)
Electrical: 120V AC, 60Hz, 5-15 amp circuit
Venting: PVC pipe (2-3 inch diameter)
Dimensions: Varies by model (typical 21"W x 26"D x 40"H)
Weight: 90-150 lbs depending on model

Control System Overview

Integrated furnace controller with diagnostic capabilities.

Control Board: Microprocessor-based with LED status indicators, fault memory, and self-diagnostic features.

Status Lights: Power (green), Heat (yellow), Fault (red). Diagnostic Codes: Flash patterns indicate specific system faults. Safety Controls: Limit switches, pressure switches, flame sensor, rollout switches. User Interface: Thermostat connections (R, W, G, Y, C terminals).

Maintenance Procedures

Recommended maintenance schedule and procedures.

Monthly: Check air filter; replace if dirty
Seasonal: Inspect vent system for obstructions
Annual: Professional inspection of heat exchanger, burners, and safety controls
Biannual: Clean flame sensor and igniter
As needed: Lubricate blower motor (if required)

Tip: Keep maintenance records for warranty compliance and service history.

Troubleshooting Guide

Common operational issues and solutions.

Symptom	Possible Cause	Corrective Action
Furnace won't start	Power loss/thermostat	Check circuit breaker; verify thermostat settings; ensure door switch engaged
No heat	Gas supply/ignition	Verify gas valve open; check for spark at igniter; inspect flame sensor
Short cycling	Dirty filter/overheat	Replace air filter; check for blocked vents; verify proper airflow
Blower not working	Motor/capacitor	Check blower door switch; test capacitor; verify motor voltage
Unusual noises	Mechanical issues	Inspect blower wheel; check for loose panels; examine heat exchanger

Error Code Diagnostics

LED flash code interpretation for fault diagnosis.

Flash Pattern	Fault Description	Resolution
1 flash	Pressure switch stuck open	Check venting; verify pressure switch operation
2 flashes	Pressure switch stuck closed	Inspect tubing; replace pressure switch if faulty
3 flashes	Rollout switch open	Check for restricted airflow; inspect heat exchanger
4 flashes	Open high temperature limit	Verify proper airflow; check filter; examine ductwork
5 flashes	Ignition failure	Check gas supply; clean flame sensor; verify spark

Parts Replacement

Common replacement parts and procedures.

Air filter: Slide out old filter; insert new one with arrow indicating airflow direction
Flame sensor: Disconnect wire; remove mounting screw; clean or replace
Igniter: Disconnect power; remove wires; install new igniter carefully
Pressure switch: Label wires; remove old switch; install replacement
Control board: Document wiring; take photos; transfer wires one at a time

WARNING! Use only Lennox-approved replacement parts for safety and warranty.

Warranty Information

Lennox Pulse furnace warranty coverage and registration.

Heat Exchanger: Limited lifetime warranty
Parts: 5-year limited warranty from installation date
Labor: 1-year limited warranty through installing dealer
Registration: Complete warranty registration within 90 days of installation
Transfer: Limited transferability to subsequent homeowners

For warranty claims, contact authorized Lennox dealer with installation details.

Technical Support

Contact information and resources for technical assistance.

Lennox Industries Inc.: PO Box 799900, Dallas, TX 75379-9900. Customer Support: 1-800-9-LENNOX (1-800-953-6669). Website: www.lennox.com. Technical Literature: Download manuals and technical bulletins from Lennox website. Dealer Locator: Use online dealer locator for authorized service providers.

Emergency Service: For gas leaks or carbon monoxide concerns, evacuate immediately and call emergency services.