owners manual for nordyne intertherm furnace feh 9303-01395

The Nordyne Intertherm FEH 9303-01395 is a high-efficiency gas furnace designed for residential heating applications. This furnace features advanced combustion technology, multiple heating stages, electronic ignition, variable-speed blower motor, and comprehensive safety controls. Below are key sections for safety, features, installation, operation, maintenance, and troubleshooting.

1. Features at a Glance 2. Installation 3. First-Time Setup 4. Specifications 5. Controls and Settings 6. Connecting to HVAC System 7. Operating Procedures 8. Safety Features 9. Maintenance & Cleaning 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Gas valve assembly, heat exchanger, blower assembly, control board, ignition system, safety switches, and venting system.

Feature	Description
Gas Valve	Precision gas flow control with multiple stages
Heat Exchanger	Stainless steel construction for durability and efficiency
Blower Assembly	Variable-speed ECM motor for quiet operation
Control Board	Microprocessor-based for precise temperature control
Ignition System	Electronic hot surface ignition
Pressure Switches	Safety monitoring of combustion air flow
Limit Switches	Over-temperature protection
Flame Sensor	Verifies burner ignition
Venting System	PVC pipe compatible for sidewall or roof venting
Filter System	Standard 1-inch or 4-inch media filter compatible

Installation

Unpack and inspect all components. Ensure proper clearances and level installation surface.

Position furnace: Place on stable, level surface with proper clearances (6 inches minimum from combustible materials).
Gas connection: Use approved gas piping and fittings; pressure test for leaks.
Electrical connection: Connect to 120V AC power supply with proper grounding.
Venting: Install PVC vent pipes according to local codes and manufacturer specifications.
Ductwork: Connect supply and return ducts securely.
Thermostat: Connect compatible 24V thermostat wires to control board.

WARNING! Installation must be performed by qualified HVAC technician. Gas leaks can cause explosion or fire.

First-Time Setup

After installation, perform initial startup and system configuration.

Gas pressure adjustment: Set manifold pressure to 3.5" WC for natural gas.
Blower speed settings: Adjust dip switches for proper airflow (CFM).
Thermostat configuration: Set up heating stages and fan control.
System check: Verify proper ignition sequence and flame operation.
Safety testing: Test all limit switches and safety controls.

CAUTION! Never bypass safety controls. Ensure proper combustion air supply.

Specifications

Model: FEH 9303-01395
Heating Capacity: 90,000 BTU/hr
Efficiency: 93% AFUE
Gas Type: Natural Gas
Electrical: 120V AC, 60Hz, 5 Amps
Blower Motor: Variable-speed ECM
Stages: Two-stage heating operation
Venting: PVC 2-inch diameter
Dimensions: 21" W x 21" D x 45" H
Weight: 125 lbs

Controls and Settings

Access control board via front panel. LED status lights indicate system operation and error codes.

Control Board: Power switch, fuse, diagnostic LED, dip switches for configuration.

Heating Stages: Low fire and high fire operation based on demand. Blower Control: Variable speed for optimal airflow and comfort. Temperature Limits: Auto-reset and manual reset limit switches. Diagnostic Codes: Flash patterns indicate specific system status and faults.

Connecting to HVAC System

Proper integration with existing HVAC components and thermostat.

Turn off power to furnace before making connections.
Thermostat wiring: Connect R, W, G, C terminals according to wiring diagram.
Humidifier: Connect to HUM terminal if equipped.
Air cleaner: Connect electronic air cleaner to appropriate terminals.
Zone control: Compatible with most zoning systems.

Tip: Use only compatible thermostats designed for two-stage gas furnaces.

Operating Procedures

Normal heating operation and seasonal startup.

Power on: Turn furnace power switch to ON position.
Thermostat call: Set thermostat above room temperature to initiate heating cycle.
Ignition sequence: Inducer motor starts, pressure switch closes, igniter glows, gas valve opens.
Flame verification: Flame sensor confirms ignition, main burners operate.
Blower operation: Blower starts after heat exchanger warm-up delay.
Cycle completion: System shuts down when thermostat satisfied.

WARNING! Never operate furnace with access panels removed. Keep combustible materials away from furnace.

Safety Features

Multiple safety systems protect against hazardous conditions. Flame Rollout Switches: Detect improper burner flames. High Limit Switches: Prevent overheating. Pressure Switches: Ensure proper venting. Flame Sensor: Confirms burner ignition. Gas Valve: Automatic shutoff if ignition fails.

Maintenance & Cleaning

Regular maintenance ensures optimal performance and safety.

Monthly: Check and replace air filter as needed.
Annual: Professional inspection and cleaning of burners, heat exchanger, and vent system.
Seasonal: Verify proper system operation before heating season.
Blower maintenance: Clean blower wheel and motor annually.

CAUTION! Turn off power and gas supply before performing any maintenance. Only qualified technicians should service gas components.

Regulatory Information

UL listed and ANSI certified for safety. Complies with ASHRAE standards for residential gas furnaces. Manufactured to meet DOE energy efficiency requirements. For technical support, contact Nordyne at 1-800-422-4328 or visit www.nordyne.com. This product must be installed by qualified personnel in accordance with all local codes and ordinances.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Furnace won't start	Power, thermostat, door switch	Check power supply; verify thermostat setting; ensure door switches engaged.
No heat	Gas supply, ignition, limit switch	Verify gas valve open; check for ignition failure; reset limit switches.
Short cycling	Dirty filter, airflow, overheating	Replace air filter; check for blocked vents; verify proper airflow.
Blower won't stop	Thermostat, control board	Check thermostat fan setting; inspect control board relay.
Error codes flashing	Various system faults	Refer to diagnostic chart in service manual; count LED flashes.

Reset: Turn power off for 30 seconds, then restart.

Service: 1-800-422-4328; www.nordyne.com