janitrol furnace gmp100 3 manual

The Janitrol GMP100-3 is a high-efficiency gas furnace designed for residential heating applications. This 100,000 BTU furnace features a multi-speed blower, electronic ignition, and safety controls. Below are key sections for safety, features, installation, operation, maintenance, and troubleshooting.

1. Features at a Glance 2. Installation Requirements 3. Initial Setup 4. Specifications 5. Controls and Operation 6. Maintenance Procedures 7. Safety Features 8. Error Codes 9. Cleaning & Care 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Gas valve, heat exchanger, multi-speed blower motor, electronic ignition system, pressure switches, and safety controls.

Feature	Description
Heating Capacity	100,000 BTU/hr input
Efficiency	80% AFUE
Blower Motor	Multi-speed, direct drive
Ignition System	Hot surface electronic ignition
Gas Valve	Automatic, combination type
Heat Exchanger	Clam shell type, aluminized steel
Safety Controls	Flame rollout switch, limit switches
Vent Connection	3-inch PVC for combustion air and flue gas
Electrical	120V AC, 60Hz
Dimensions	See specifications section

Installation Requirements

Proper installation is critical for safe and efficient operation. Follow all local codes and manufacturer instructions.

Location: Install in dry, clean area with adequate combustion air and service clearance.
Venting: Use approved PVC pipe for intake and exhaust; maintain proper slope.
Gas Connection: Use black iron pipe with proper thread sealant; pressure test for leaks.
Electrical: Connect to 120V AC dedicated circuit; proper grounding required.
Ductwork: Ensure proper sizing and sealing for optimal airflow.

WARNING! Installation must be performed by qualified HVAC technician. Improper installation can cause fire, explosion, or carbon monoxide poisoning.

Initial Setup

After installation, perform initial setup and verification.

Gas pressure check: Verify manifold pressure per specifications.
Blower speed: Set appropriate speed for heating application.
Thermostat: Connect compatible 24V thermostat; set to heat mode.
Test operation: Run through complete heating cycle; verify proper ignition and shutdown.
Combustion analysis: Verify proper CO levels in flue gas.

CAUTION! Never bypass safety controls. Always verify proper operation before leaving installation.

Specifications

Model: GMP100-3
Input BTU: 100,000 BTU/hr
Output BTU: 80,000 BTU/hr
Efficiency: 80% AFUE
Gas Type: Natural Gas (convertible to LP)
Manifold Pressure: 3.5" WC Natural Gas
Electrical: 120V AC, 60Hz, 6.5 amps
Blower Speeds: 4 heating speeds
Vent Size: 3-inch PVC
Dimensions: 21" W x 21" D x 46" H
Weight: 125 lbs

Controls and Operation

Integrated control board manages all furnace functions with LED status indicator.

Control Board: Monitors safety devices, controls ignition sequence, manages blower operation.

Operation Sequence: Call for heat from thermostat → Inducer motor starts → Pressure switch proves draft → Hot surface igniter glows → Gas valve opens → Flame proven → Blower starts after heat exchanger warm-up.

Thermostat Settings: Set to AUTO for automatic fan operation, ON for continuous fan. Temperature differential typically 2-3°F.

Maintenance Procedures

Regular maintenance ensures efficiency and longevity.

Monthly: Check air filter; replace when dirty.
Annual: Professional inspection and cleaning.
Blower compartment: Clean annually; check belt tension if applicable.
Heat exchanger: Visual inspection for cracks or damage.
Burners: Clean and verify proper flame pattern.
Vent system: Inspect for obstructions or damage.

Tip: Keep area around furnace clear of combustible materials.

Safety Features

Multiple safety devices protect against hazardous conditions.

Safety Device	Function
Flame Rollout Switch	Detects flame outside combustion chamber
High Limit Switch	Prevents overheating
Pressure Switches	Verify proper venting operation
Flame Sensor	Confirms burner ignition
Gas Valve	Automatic shutoff if flame not detected

WARNING! Never operate furnace with safety devices bypassed.

Error Codes

Control board LED flashes indicate specific error conditions.

Flash Pattern	Description	Action
1 Flash	Pressure switch stuck open	Check venting, pressure switch
2 Flashes	Pressure switch stuck closed	Check inducer, pressure switch
3 Flashes	Limit circuit fault	Check airflow, filters, limits
4 Flashes	Ignition failure	Check gas, igniter, flame sensor
5 Flashes	Flame rollout	Check burners, heat exchanger
Continuous	Normal operation	No action required

Cleaning & Care

Regular cleaning maintains efficiency and safety.

Exterior: Wipe with damp cloth; avoid harsh chemicals.

Interior: Professional cleaning recommended annually. Clean burners, heat exchanger surfaces, blower assembly.

Air Filter: Replace every 1-3 months depending on usage and environment.

CAUTION! Disconnect power before performing any cleaning or maintenance.

Regulatory Information

UL listed and ANSI certified. Complies with U.S. safety standards for gas-fired heating equipment. Manufactured to meet efficiency requirements per DOE regulations. For technical support or warranty service, contact Janitrol customer service at 1-800-654-3286 or visit www.janitrol.com.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Furnace won't start	Power, thermostat, door switch	Check circuit breaker, thermostat setting, door switch engagement
No heat	Gas supply, ignition	Verify gas valve on, check for ignition attempts
Short cycling	Dirty filter, airflow	Replace filter, check for blocked vents/registers
Blower won't stop	Thermostat setting	Check thermostat fan setting (AUTO/ON)
Unusual noises	Mechanical issues	Check blower wheel, motor bearings, inducer assembly
Pilot/ignition failure	Gas valve, sensor	Check gas pressure, clean flame sensor, verify igniter operation

Reset: Turn power off for 30 seconds, then restore. Check error codes if problem persists.

Service: 1-800-654-3286; www.janitrol.com