owners manual for nordyne intertherm furnace feha-015ha-01

The Nordyne Intertherm FEHA-015HA-01 is a high-efficiency gas furnace designed for residential heating applications. This 15,000 BTU unit features electronic ignition, multi-speed blower motor, safety controls, and compatibility with standard thermostat systems. Below are key sections covering safety precautions, installation, operation, maintenance, and troubleshooting guidelines.

1. Features at a Glance 2. Safety Precautions 3. Installation Requirements 4. Specifications 5. Controls and Operation 6. Wiring and Electrical Connections 7. Startup and Shutdown Procedures 8. Maintenance Schedule 9. Troubleshooting Guide 10. Warranty Information

Features at a Glance

Key components: Gas valve, heat exchanger, blower assembly, electronic ignition system, limit switches, pressure switch, and venting system.

FeatureDescription
Electronic IgnitionEnergy-efficient hot surface ignition system
Multi-speed BlowerAdjustable airflow for optimal performance
Safety ControlsAutomatic shutoff for over-temperature conditions
Heat ExchangerStainless steel construction for durability
Gas ValvePrecise gas flow regulation
Pressure SwitchEnsures proper venting operation
Limit SwitchesPrevents overheating
Venting SystemCategory IV venting compatible
Thermostat ConnectionStandard 24V thermostat terminals
Service LightLED indicator for diagnostic codes

Safety Precautions

Critical safety information for proper furnace operation and maintenance.

  1. Install carbon monoxide detectors in living areas near bedrooms.
  2. Keep combustible materials at least 18 inches from furnace.
  3. Ensure proper ventilation and combustion air supply.
  4. Turn off gas and electrical power before servicing.
  5. Only qualified technicians should perform installation and repairs.

WARNING! Failure to follow safety precautions may result in fire, explosion, carbon monoxide poisoning, or electrical shock. Never bypass safety controls.

Installation Requirements

Professional installation by qualified HVAC technician required.

  1. Location: Install in dry, well-ventilated area with service clearance.
  2. Venting: Use approved Category IV vent pipe; maintain proper slope.
  3. Gas Connection: Use black iron pipe with drip leg; pressure test required.
  4. Electrical: 120V, 60Hz power supply with proper grounding.
  5. Combustion Air: Ensure adequate fresh air supply per local codes.
  6. Ductwork: Properly sized and sealed return and supply ducts.

CAUTION! Improper installation may void warranty and create hazardous conditions.

Specifications

Controls and Operation

Main control board manages ignition sequence, blower operation, and safety functions.

Operating Sequence: Thermostat call for heat → Inducer motor starts → Pressure switch proves → Hot surface igniter heats → Gas valve opens → Flame sensor confirms ignition → Blower starts after heat exchanger warms.

Control Board LED: Steady green = normal operation; Flashing = error code (refer to diagnostic chart).

Gas Valve: Regulates gas flow; includes manual shutoff.

Limit Switch:Automatically shuts off burner if over-temperature detected.

Wiring and Electrical Connections

Standard 24V thermostat connections and 120V power supply requirements.

  1. Disconnect power before making electrical connections.
  2. Connect thermostat wires to R, W, G, C terminals.
  3. Ground furnace chassis to electrical service ground.
  4. Verify proper voltage at control board (24VAC for controls, 120VAC for blower).
  5. Use wire nuts and electrical tape for secure connections.

Tip: Use 18-gauge thermostat wire for runs under 50 feet.

Startup and Shutdown Procedures

Proper procedures for seasonal operation and extended shutdown.

  1. Startup: Verify gas supply on → Turn on electrical power → Set thermostat to heat mode → Observe ignition sequence → Check for proper flame → Verify blower operation.
  2. Normal Shutdown: Set thermostat to off position → System completes cool-down cycle.
  3. Emergency Shutdown: Turn off gas valve → Turn off electrical power → Contact qualified technician.
  4. Seasonal Shutdown: Turn off gas and electrical power → Clean furnace components → Cover unit if storing.

WARNING! Never attempt to relight pilot or service gas components without proper training.

Maintenance Schedule

Regular maintenance ensures efficient operation and extends furnace life.

Maintenance TaskFrequencyProcedure
Air Filter ReplacementMonthly during heating seasonReplace disposable filter or clean permanent filter
Blower CleaningAnnuallyVacuum blower wheel and housing
Heat Exchanger InspectionAnnuallyCheck for cracks or corrosion
Vent System InspectionAnnuallyCheck for obstructions or damage
Gas Pressure CheckAnnuallyVerify inlet and manifold pressures
Safety Control TestAnnuallyVerify proper operation of all safety switches

Troubleshooting Guide

SymptomPossible CauseCorrective Action
Furnace won't startPower off, thermostat setting, door switchCheck power supply, verify thermostat setting, ensure door properly closed
No heatGas supply, igniter, flame sensorCheck gas valve, inspect igniter for damage, clean flame sensor
Short cyclingDirty filter, blocked vent, limit switchReplace filter, check vent for obstructions, test limit switch
Blower won't stopThermostat fan setting, control boardCheck thermostat fan setting (auto/on), inspect control board
Unusual noisesLoose components, motor bearingsTighten mounting hardware, lubricate motor if applicable
Error code flashingVarious system faultsCount flashes and refer to diagnostic code chart in service manual

Reset: Turn power off for 30 seconds then restore to reset control board.

Service: Contact qualified HVAC technician for complex issues.

Warranty Information

Nordyne Intertherm furnaces are backed by limited warranties. Register product within 60 days of installation.

Warranty requires professional installation and proper maintenance. Keep installation receipt and maintenance records. For warranty claims, contact Nordyne customer service at 1-800-422-4328 or visit www.nordyne.com.

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