Janitrol Furnace Service Manual

The Janitrol Furnace is a high-efficiency residential heating system designed for reliable performance and easy maintenance. This manual covers gas-fired forced air furnaces with features including electronic ignition, multi-speed blower motors, safety controls, and energy-efficient operation. Below are key sections for safety procedures, technical specifications, installation guidelines, maintenance procedures, troubleshooting, and repair instructions.

1. Safety Precautions 2. Technical Specifications 3. Installation Guidelines 4. Component Overview 5. Operating Instructions 6. Maintenance Procedures 7. Troubleshooting Guide 8. Repair Instructions 9. Wiring Diagrams 10. Parts List 11. Warranty Information

Safety Precautions

Critical safety information for proper furnace operation and service.

Hazard	Precaution
Gas leaks	Shut off gas supply immediately; ventilate area
Electrical shock	Disconnect power before servicing
Carbon monoxide	Ensure proper ventilation; install CO detectors
High temperatures	Allow furnace to cool before servicing
Combustible materials	Maintain clearance per installation manual

WARNING! Always follow local codes and regulations. Only qualified technicians should perform service.

Technical Specifications

Model Series: Various residential gas furnace models
Fuel Type: Natural gas or propane
Input Capacity: 40,000 - 120,000 BTU/hr
Efficiency: 80% - 96% AFUE
Electrical: 120V AC, 60Hz
Blower Motor: Multi-speed PSC or ECM
Ignition System: Hot surface or intermittent pilot
Vent Size: 3" - 6" depending on model
Operating Pressure: 3.5" WC natural gas

Installation Guidelines

Proper installation procedures for safe and efficient operation.

Location selection: Choose well-ventilated area with proper clearances
Venting: Install according to manufacturer specifications and local codes
Gas connection: Use approved pipe and fittings; pressure test for leaks
Electrical: Connect to dedicated circuit with proper grounding
Ductwork: Ensure proper sizing and sealing
Startup: Perform initial ignition and safety check sequence

CAUTION! Improper installation can cause fire, explosion, or carbon monoxide poisoning.

Component Overview

Major furnace components and their functions.

Component	Function
Heat exchanger	Transfers heat from combustion to air
Burners	Provide controlled gas combustion
Gas valve	Regulates gas flow to burners
Igniter	Ignites gas-air mixture
Flame sensor	Detects burner flame presence
Blower motor	Circulates air through system
Limit switches	Prevent overheating
Control board	Manages furnace operation sequence
Pressure switch	Ensures proper venting

Operating Instructions

Normal furnace operation and user controls.

Thermostat settings: Set desired temperature and system mode
System modes: Heat, Off, Fan (Auto/On)
Pilot light: Electronic ignition - no manual lighting required
Blower operation: Automatic with heat call or manual fan mode
Safety shutdown: System will lock out after multiple ignition failures

Note: Refer to thermostat manual for specific control instructions.

Maintenance Procedures

Routine maintenance for optimal performance and longevity.

Air filter: Replace every 1-3 months depending on usage
Burner inspection: Clean annually; check for proper flame
Blower assembly: Clean blades and housing annually
Heat exchanger: Inspect for cracks or corrosion annually
Vent system: Check for obstructions and proper draft
Electrical connections: Tighten and inspect for corrosion
Gas connections: Leak test annually

Recommended: Annual professional inspection before heating season.

Troubleshooting Guide

Symptom	Possible Cause	Corrective Action
No heat	Thermostat, power, gas supply	Check thermostat setting, circuit breaker, gas valve
Furnace won't start	Safety lockout, limit switch	Reset power, check error codes, inspect limit switches
Short cycling	Dirty filter, overheating	Replace filter, check airflow, clean heat exchanger
Blower won't stop	Thermostat fan setting, relay	Check thermostat fan setting, test blower relay
Unusual noises	Loose parts, motor issues	Inspect for loose components, lubricate motor if applicable
Pilot outage	Draft, thermocouple	Check venting, clean pilot assembly, replace thermocouple

Repair Instructions

Common repair procedures for qualified technicians.

Igniter replacement: Disconnect power, remove old igniter, install new unit
Flame sensor cleaning: Remove, clean with emery cloth, reinstall
Gas valve replacement: Shut off gas, disconnect wiring, replace valve
Blower motor replacement: Disconnect power, remove blower assembly, replace motor
Control board replacement: Document wiring, remove old board, install replacement
Heat exchanger replacement: Major repair requiring complete disassembly

WARNING! Gas and electrical repairs should only be performed by qualified technicians.

Wiring Diagrams

Reference wiring diagrams for proper electrical connections.

Low voltage thermostat connections (R, W, G, Y, C)
Line voltage power connections (L1, L2, Ground)
Control board terminal identification and functions
Safety circuit wiring (limit switches, pressure switches)
Blower motor speed connections
Gas valve wiring

Note: Specific wiring diagrams vary by model - refer to unit data plate.

Parts List

Common replacement parts and their specifications.

Part Number	Description	Compatible Models
JN-IGN-120	Hot surface igniter	Most 2005+ models
JN-FS-45	Flame sensor	Standard furnaces
JN-GV-NAT	Natural gas valve	80% efficiency models
JN-BL-1/3	1/3 HP blower motor	Residential units
JN-FIL-16x25	16x25 air filter	Standard size
JN-CB-2345	Control board	Multiple models

Warranty Information

Janitrol furnace warranty coverage and terms.

Heat exchanger: 20-year limited warranty
Parts: 5-year limited warranty
Labor: 1-year from date of installation
Registration: Required within 90 days of installation
Transferable: Yes, to subsequent homeowners
Exclusions: Damage from improper installation, lack of maintenance

For warranty claims: Contact Janitrol customer service at 1-800-JANITROL or visit www.janitrol.com