ICP Furnace Model WFMR090B042B Manual Code

The ICP WFMR090B042B is a high-efficiency gas furnace with 90,000 BTU input capacity, 80% AFUE rating, single-stage operation, natural gas fuel type, multi-speed blower motor, electronic ignition system, durable heat exchanger, and built-in safety controls. 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. Specifications 5. Controls and Settings 6. Gas Line Connection 7. Electrical Wiring 9. Maintenance Procedures 10. Safety Information 11. Regulatory Compliance 12. Troubleshooting

Features at a Glance

Key components: Heat exchanger, blower assembly, gas valve, igniter, flame sensor, pressure switches, control board.

FeatureDescription
Heat ExchangerDurable aluminized steel construction
Blower MotorMulti-speed ECM motor for efficient airflow
Gas ValveSingle-stage automatic gas control
Ignition SystemHot surface electronic ignition
Flame SensorSafety device to detect burner flame
Pressure SwitchesVerify proper venting operation
Control BoardIntegrated furnace controller with diagnostic LEDs
Air FilterStandard 1-inch filter slot
Thermostat ConnectionsStandard 24V thermostat terminals
Safety SwitchesDoor safety interlock system

Installation Requirements

Unpack and inspect all components. Verify proper clearances and location requirements.

  1. Location: Install in approved area with proper combustion air and clearances.
  2. Venting: Connect approved PVC vent pipes according to local codes.
  3. Gas line: Connect 1/2-inch black iron pipe with proper shutoff valve.
  4. Electrical: Connect 120V AC power supply with dedicated circuit.
  5. Ductwork: Connect supply and return ducts with proper sealing.

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

First-Time Setup

Complete installation verification and initial startup procedure.

  1. Gas pressure check: Verify manifold pressure set to 3.5" WC for natural gas.
  2. Venting verification: Confirm proper draft and vent pipe slope.
  3. Electrical connections: Verify 120V power and thermostat wiring.
  4. Airflow adjustment: Set blower speeds for heating operation.
  5. Initial ignition: Start furnace and verify proper flame characteristics.

CAUTION! Always check for gas leaks using soap solution before initial startup.

Specifications

Controls and Settings

Access control board via front panel. Integrated diagnostic LED for troubleshooting.

Control Board: POWER switch, Fuse, Thermostat terminals, Gas valve connector, Blower motor connections, Pressure switch terminals, Limit switch connections.

Operating Modes: Heating mode activated by thermostat call for heat. Blower delay settings: 30-second blower-on delay, 90-second blower-off delay. Temperature rise: Verify 35-65°F temperature rise across heat exchanger. Airflow settings: Adjust blower speeds for proper CFM delivery.

Gas Line Connection

Natural gas supply connection requirements and procedures.

  1. Turn off gas supply at main shutoff valve.
  2. Install sediment trap before gas valve connection.
  3. Use approved pipe thread compound on all connections.
  4. Connect 1/2-inch black iron pipe to furnace gas valve.
  5. Install manual shutoff valve within 6 feet of furnace.
  6. Pressure test all connections for leaks.

Tip: Always purge air from gas line before initial ignition.

Electrical Wiring

Power supply and control wiring connections.

  1. Disconnect power at circuit breaker before wiring.
  2. Connect 120V AC power to control board L1 and L2 terminals.
  3. Connect ground wire to grounding lug.
  4. Connect thermostat wires to R, W, G, C terminals.
  5. Verify proper polarity and secure all connections.
  6. Install 3-5 amp fuse in control board fuse holder.

WARNING! Electrical work must comply with NEC and local codes. Use lockout/tagout procedures.

Maintenance Procedures

Regular maintenance schedule and procedures for optimal performance.

  1. Monthly: Check and replace air filter as needed.
  2. Annual: Professional inspection and cleaning.
  3. Clean flame sensor with emery cloth.
  4. Inspect heat exchanger for cracks or damage.
  5. Verify proper burner flame pattern.
  6. Check vent system for obstructions.
  7. Lubricate blower motor if required.
  8. Test safety controls and limit switches.

CAUTION! Always disconnect power and gas supply before performing maintenance.

Safety Information

Carbon monoxide detectors required in sleeping areas. Maintain proper clearances to combustibles.

WARNING! Never operate furnace without door panels installed. Keep combustible materials away from furnace. Install CO detectors according to manufacturer instructions.

Regulatory Compliance

ANSI Z21.47/CSA 2.3: Certified for natural gas operation. UL listed. Complies with U.S. Department of Energy efficiency standards. Manufactured by International Comfort Products. For technical support, contact 1-800-ICP-HELP or visit www.icpindex.com.

Troubleshooting

SymptomPossible CauseCorrective Action
Furnace won't startPower/thermostatCheck circuit breaker; verify thermostat setting; check door switch.
No heatGas supply/ignitionVerify gas valve on; check for ignition lockout; inspect flame sensor.
Short cyclingAirflow/overheatingCheck air filter; verify proper airflow; inspect limit switch.
Blower not runningMotor/controlCheck blower capacitor; verify control board signals; test motor windings.
Lockout conditionSafety trippedReset power; check pressure switches; verify venting; inspect flame rollout switches.

Diagnostic Codes: Refer to control board LED flash patterns for specific error codes.

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

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