ICP Furnace Model WFMR090B042B1 Manual

The ICP WFMR090B042B1 is a high-efficiency gas furnace with 90,000 BTU input capacity, multi-speed blower motor, electronic ignition system, durable heat exchanger, and advanced safety controls. Designed for residential heating applications with up to 90% AFUE rating. Below are key sections for safety, features, installation, operation, maintenance, and troubleshooting.

1. Features at a Glance 2. Installation Requirements 3. First-Time Setup 4. Technical Specifications 5. Controls and Settings 6. Venting and Combustion Air 7. Operation Instructions 8. Maintenance Procedures 9. Safety Information 10. Regulatory Compliance 11. Troubleshooting Guide

Features at a Glance

Key components: Multi-speed direct drive blower, hot surface ignition, aluminized steel heat exchanger, integrated control board, pressure switches, flame sensor, and limit controls.

Feature	Description
Input Capacity	90,000 BTU/H
AFUE Rating	Up to 90%
Blower Motor	Multi-speed direct drive
Ignition System	Hot surface electronic ignition
Heat Exchanger	Aluminized steel tubular
Gas Type	Natural gas
Venting	PVC pipe (2-inch recommended)
Electrical	115V, 60Hz
Dimensions	See specifications section
Weight	Approximately 120 lbs

Installation Requirements

Professional installation required. Verify local codes and obtain permits.

Location: Install in approved areas with proper clearances (see specifications).
Venting: Install PVC vent pipes according to manufacturer specifications.
Gas connection: Use approved pipe and fittings; pressure test for leaks.
Electrical: Connect to dedicated 115V circuit with proper grounding.
Ductwork: Ensure proper sizing and sealing for optimal performance.

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

First-Time Setup

Initial startup must be performed by qualified technician.

Verify all connections: Gas, electrical, venting, and ductwork.
Check gas pressure: Adjust manifold pressure if necessary.
Test safety controls: Verify limit switches and pressure switches function.
Set blower speeds: Adjust for proper airflow and temperature rise.
Program thermostat: Connect compatible thermostat for optimal operation.

CAUTION! Never operate furnace without proper venting. Test for gas leaks before startup.

Technical Specifications

Model: WFMR090B042B1
Input BTU/H: 90,000
Output BTU/H: 81,000
AFUE: 90%
Gas Type: Natural Gas
Manifold Pressure: 3.5" W.C.
Electrical: 115V, 60Hz, 5.2 Amps
Blower Speeds: Multi-speed (Cooling/Heating)
Vent Size: 2-inch PVC
Dimensions (HxWxD): 44" x 17.5" x 21"
Shipping Weight: 120 lbs

Controls and Settings

Integrated control board manages all furnace operations with LED status indicators.

Control Board Features: Self-diagnostic capability, status LED, blower control, gas valve control, safety lockout.

Thermostat Connections: R (24V), W (Heat), G (Fan), C (Common). Blower Speed Settings: Adjust cooling and heating speeds via motor taps. Limit Settings: Factory set high limit control (200°F). Pressure Switch: Monitors venting operation.

Venting and Combustion Air

Proper venting is critical for safe operation. Use PVC pipe only.

Vent Pipe: 2-inch diameter PVC schedule 40.
Combustion Air: Provide adequate fresh air intake.
Vent Termination: Locate according to local codes and manufacturer guidelines.
Slope: Horizontal runs should slope upward 1/4" per foot toward furnace.

Tip: Always check vent pipes for obstructions before each heating season.

Operation Instructions

Furnace operates automatically when thermostat calls for heat.

Inducer Motor: Starts first to establish draft.
Pressure Switch: Verifies proper draft.
Ignition: Hot surface igniter glows.
Gas Valve: Opens to allow gas flow.
Flame Sensor: Confirms ignition.
Blower Motor: Starts after heat exchanger warms up.
Shutdown: Gas valve closes first, blower continues for cool-down.

WARNING! If furnace fails to start after multiple attempts, call for service. Do not attempt repeated manual resets.

Maintenance Procedures

Annual maintenance by qualified technician recommended.

Monthly: Check and replace air filter
Annual: Clean burners and heat exchanger
Annual: Inspect and clean flame sensor
Annual: Check gas pressure and electrical connections
Annual: Verify safety controls operation

CAUTION! Turn off gas and electrical power before performing any maintenance.

Safety Information

Carbon monoxide detectors required in home with gas appliances.

DANGER! Gas leaks can cause explosion or fire. If you smell gas, evacuate immediately and call emergency services. Do not operate electrical switches or create sparks.

Regulatory Compliance

ANSI Z21.47: Certified for natural gas operation. UL: Listed for safety. Meets U.S. Department of Energy efficiency standards. For technical support, contact ICP at 1-877-4-ICP-PRO or visit www.icpindex.com.

Troubleshooting Guide

Symptom	Possible Cause	Corrective Action
Furnace won't start	Power, thermostat, switch	Check circuit breaker, thermostat setting, door switch
No heat	Gas supply, ignition	Verify gas valve on, check for ignition attempts
Short cycling	Filter, limit switch	Replace air filter, check for blocked vents
Blower won't stop	Thermostat, control board	Check thermostat fan setting, control board operation
Lockout condition	Safety device tripped	Reset power, check LED status code

Reset Procedure: Turn power off for 30 seconds, then restore.

Service: 1-877-4-ICP-PRO; www.icpindex.com