ICP Furnace Model WFMR090B042B1 Manual Code

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, integrated control board, safety switches, pressure switches, flame sensor, and diagnostic LED indicators. Designed for residential forced-air heating systems with 80% AFUE rating. Below are key sections for safety, features, installation, setup, operation, maintenance, and troubleshooting.

1. Features at a Glance 2. Installation Requirements 3. First-Time Setup 4. Technical Specifications 5. Controls and Settings 6. Wiring Connections 7. Operating Procedures 8. Maintenance Schedule 9. Safety Features 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Multi-speed blower motor, electronic ignition system, aluminized steel heat exchanger, integrated control board, pressure switches, flame sensor, diagnostic LED.

Feature	Description
Input Capacity	90,000 BTU/hour
AFUE Rating	80% Annual Fuel Utilization Efficiency
Blower Motor	Multi-speed ECM motor
Ignition System	Hot surface electronic ignition
Heat Exchanger	Aluminized steel tubular
Control Board	Integrated furnace control with diagnostics
Gas Valve	Automatic gas control with regulator
Pressure Switches	Draft and vent pressure verification
Flame Sensor	Flame rectification safety
Diagnostic LED	Flash code error indication

Installation Requirements

Professional installation required. Verify local codes and obtain permits.

Location: Install in clean, dry area with proper clearances and combustion air.
Venting: Use approved Category I venting materials; maintain proper slope.
Gas Supply: Connect with black iron pipe; test for leaks with soap solution.
Electrical: 120V AC power with proper grounding; install disconnect switch.
Ductwork: Size properly for airflow; seal all connections.

WARNING! Gas appliances can be dangerous; installation must be performed by qualified technician only.

First-Time Setup

Complete installation verification before initial startup.

Gas pressure check: Verify manifold pressure (3.5" WC natural gas).
Venting verification: Confirm proper draft and vent clearances.
Electrical connections: Check voltage and thermostat wiring.
Blower speed: Set appropriate CFM for heating application.
Initial startup: Follow lighting instructions; observe flame pattern.

CAUTION! Never bypass safety controls; ensure proper ventilation at all times.

Technical Specifications

Model: WFMR090B042B1
Input BTU: 90,000 BTU/hour
Output BTU: 72,000 BTU/hour
AFUE: 80%
Gas Type: Natural Gas
Manifold Pressure: 3.5" WC Natural Gas
Electrical: 120V AC, 60Hz
Motor Type: Multi-speed ECM
Airflow Range: 900-1400 CFM
Venting: Category I
Dimensions: Refer to installation manual
Weight: Approximately 120 lbs

Controls and Settings

Integrated furnace control board with diagnostic capabilities.

Control Board: POWER switch, Diagnostic LED, DIP switches, terminal strip.

Blower Speeds: Adjustable for heating and continuous fan operation. Gas Valve: Automatic operation with pressure regulator. Thermostat Connections: R, W, G, Y, C terminals. Diagnostic Codes: LED flash patterns indicate specific error conditions. DIP Switch Settings: Configure for specific installation requirements.

Wiring Connections

Follow wiring diagram provided with unit and local electrical codes.

Disconnect power before servicing any electrical components.
Thermostat wiring: Connect to control board terminal strip.
Line voltage: 120V AC to designated power terminals.
Grounding: Proper equipment grounding required.
Check all connections for tightness and proper wire routing.

Tip: Use wire nuts and electrical tape for secure connections.

Operating Procedures

Normal heating operation sequence.

Thermostat calls for heat: Sends signal to control board.
Inducer motor: Starts to establish draft.
Pressure switch: Verifies proper draft.
Hot surface igniter: Heats up for ignition.
Gas valve: Opens to supply gas to burners.
Flame sensor: Confirms flame establishment.
Blower motor: Delays then starts to circulate heated air.
Shutdown: Follows reverse sequence when thermostat satisfied.

WARNING! Never operate without access panels properly installed.

Maintenance Schedule

Annual professional maintenance recommended.

Monthly: Check air filter; replace if dirty
Annual: Professional inspection and cleaning
Every 2 years: Heat exchanger inspection
As needed: Blower wheel cleaning, flame sensor cleaning

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

Safety Features

Multiple safety systems protect against hazardous conditions.

Safety Feature	Function
Flame Rollout Switches	Detects flame outside combustion chamber
High Limit Switch	Prevents overheating
Pressure Switches	Verifies proper venting
Flame Sensor	Confirms burner ignition
Gas Valve	Automatic shutoff if ignition fails

Regulatory Information

UL listed and ANSI certified. Complies with applicable safety standards. Manufactured to meet or exceed industry specifications. For technical support or replacement parts, contact ICP technical support at 1-800-ICP-HELP or visit www.icp.com. Keep this manual for future reference.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No heat	Power, thermostat, gas supply	Check power switch; verify thermostat setting; confirm gas valve open.
Furnace won't start	Safety lockout, pressure switch	Reset power; check pressure switch tubing; verify venting.
Short cycling	Dirty filter, high limit	Replace air filter; check for restricted airflow.
Blower won't stop	Thermostat fan setting	Check thermostat fan setting (AUTO/ON); verify G terminal connection.
Error codes flashing	Various system faults	Count LED flashes; refer to diagnostic code chart in manual.

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

Service: 1-800-ICP-HELP; www.icp.com