Nordyne Intertherm Furnace Manual

The Nordyne Intertherm Furnace is a high-efficiency gas heating system designed for residential use, featuring electronic ignition, multi-speed blower motor, safety controls, and compatibility with various thermostat systems. 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 Thermostat 7. Operating Procedures 8. Safety Features 9. Maintenance & Cleaning 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Gas valve, heat exchanger, blower assembly, electronic ignition system, safety controls, filter access, and thermostat connections.

Feature	Description
Electronic Ignition	Energy-efficient spark ignition system
Multi-speed Blower	Adjustable airflow for optimal heating
Safety Controls	Automatic shut-off for overheating
Filter Access	Easy-access filter compartment
Gas Valve	Precision gas flow control
Heat Exchanger	Stainless steel construction
Thermostat Connections	Compatible with standard 24V systems
Pressure Switch	Ensures proper venting operation
Limit Switch	Prevents overheating conditions
Flame Sensor	Monitors burner operation

Installation

Unpack and inspect all components. Ensure proper clearances and venting.

Position furnace: Place on stable, level surface with proper clearances.
Connect gas line: Use approved gas piping and fittings.
Install venting: Follow local codes for proper vent installation.
Electrical connections: Connect to 120V power supply and thermostat.
Install filter: Insert proper size air filter in filter rack.

WARNING! Gas appliances can be dangerous; installation must be performed by qualified technician. Ensure proper ventilation.

First-Time Setup

Initial startup and system verification procedures.

Gas pressure check: Verify correct gas pressure at manifold.
Ventilation check: Ensure proper draft and venting operation.
Thermostat setup: Program desired temperature settings.
System test: Run through complete heating cycle.
Safety verification: Confirm all safety controls function properly.

CAUTION! Only qualified technicians should perform initial startup and gas connections.

Specifications

Heating Capacity: 40,000 - 120,000 BTU/h
Efficiency: 80% AFUE or higher
Fuel Type: Natural Gas or LP
Electrical: 120V, 60Hz, 1.5-3.0 Amps
Blower Motor: Multi-speed, permanently lubricated
Gas Connection: 1/2" NPT
Vent Size: 3" - 5" depending on model
Filter Size: 16x25x1 or 20x25x1 standard
Operating Temp Range: -30°F to 120°F ambient

Controls and Settings

Access control board via front panel. Integrated control module with status lights.

Control Board Indicators: Power LED, Status flash codes, Reset button.

Temperature Settings: Adjust via thermostat. Blower Speed: Factory set for optimal airflow. Gas Pressure: Adjust at gas valve (qualified technician only). Limit Controls: Automatic high-limit protection. Pressure Switch: Ensures venting safety.

Connecting Thermostat

Standard 24V thermostat wiring connections at control board.

Turn off power to furnace at disconnect switch.
Remove control panel to access thermostat terminals.
Connect wires: R (24V), W (Heat), G (Fan), C (Common).
Secure connections and replace panel.
Restore power and test operation.

Tip: Use 18-gauge thermostat wire for best performance.

Operating Procedures

Normal heating cycle operation and seasonal startup.

Set thermostat to desired temperature above room temp.
Furnace initiates: Inducer motor starts, pressure switch verifies.
Ignition sequence: Hot surface igniter or spark ignition activates.
Gas valve opens: Burners ignite, flame sensor confirms.
Blower starts: After heat exchanger warms up.
Cycle complete: Thermostat satisfied, gas valve closes, blower continues.

WARNING! Never bypass safety controls. If furnace fails to start, wait 5 minutes before retry.

Safety Features

Multiple safety systems protect against hazardous conditions.

Flame Rollout Switch: Detects improper burner flames. High Limit Switch: Prevents overheating. Pressure Switch: Ensures proper venting. Flame Sensor: Confirms burner ignition. Gas Valve: Automatic shut-off capability.

Maintenance & Cleaning

Regular maintenance ensures optimal performance and safety.

Monthly: Check and replace air filter as needed.
Seasonal: Inspect burners and heat exchanger.
Annual: Professional inspection and cleaning.
Venting: Check for obstructions annually.

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

Regulatory Information

ANSI Z21.47: Certified for gas-fired central furnaces. UL listed for safety. CSA approved for Canadian installations. All installations must comply with local building codes and NFPA 54. For technical support, contact Nordyne at 1-800-422-4328 or visit www.nordyne.com.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Furnace won't start	Power/thermostat	Check circuit breaker; verify thermostat setting; ensure gas valve open.
No heat	Ignition failure	Check status lights; verify gas supply; inspect igniter.
Blower won't run	Motor/controls	Check blower door switch; verify motor operation; inspect capacitor.
Short cycling	Filter/limit switch	Replace dirty filter; check high limit switch; verify airflow.
Unusual noises	Mechanical issues	Inspect blower wheel; check motor bearings; verify ductwork.

Reset: Power cycle furnace at disconnect switch if lockout occurs.

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