Nordyne Electric Furnace Service Manual

The Nordyne Electric Furnace is a high-efficiency heating system designed for residential and light commercial applications. This manual covers installation, operation, maintenance, and troubleshooting procedures for various Nordyne electric furnace models. The furnace features multiple heating elements, blower assembly, control board, safety switches, and thermal protection devices. Below are key sections for safety, technical specifications, installation, operation, maintenance, and troubleshooting.

1. Features at a Glance 2. Installation Guidelines 3. Initial Setup and Commissioning 4. Technical Specifications 5. Controls and Operation 6. Electrical Connections 7. Maintenance Procedures 8. Safety Features 9. Care & Cleaning 10. Regulatory Information 11. Troubleshooting Guide

Features at a Glance

Key components: Heating elements, Blower assembly, Control board, Limit switches, Transformer, Sequencer, Air filter compartment.

Feature	Description
Heating elements	Multiple electric heating elements for staged heating
Blower assembly	Variable speed blower for air circulation
Control board	Microprocessor-based control system
Limit switches	Safety devices to prevent overheating
Transformer	Steps down voltage for control circuit
Sequencer	Controls staging of heating elements
Air filter compartment	Standard 1-inch filter access
Thermal protection	Automatic shut-off for high temperature
LED status lights	Diagnostic indicators for troubleshooting
Service disconnect	External power disconnect switch

Installation Guidelines

Unpack and inspect all components. Ensure proper clearances and mounting surface.

Location selection: Choose well-ventilated area with proper clearances (minimum 6 inches from combustible materials).
Ductwork connection: Secure all duct connections with appropriate fasteners and seal with duct tape.
Electrical connections: Connect to dedicated 240V circuit with proper amperage rating.
Grounding: Ensure proper grounding according to local electrical codes.
Filter installation: Install appropriate air filter in filter compartment.

WARNING! Installation must be performed by qualified HVAC technician. Disconnect all power before servicing.

Initial Setup and Commissioning

Power on furnace; verify proper operation through startup sequence.

Power verification: Ensure proper voltage at disconnect switch.
Thermostat connection: Connect thermostat wires to control board terminals.
System check: Verify blower operation and heating element sequencing.
Airflow measurement: Check static pressure and adjust blower speed if necessary.
Temperature rise: Measure and verify within manufacturer specifications.

CAUTION! High voltage present. Use appropriate personal protective equipment during setup.

Technical Specifications

Voltage: 208/240V AC, 60Hz
Heating Capacity: 5kW to 20kW (model dependent)
Blower Motor: PSC or ECM variable speed
Airflow: 400-1400 CFM (depending on model)
Temperature Rise: 30-70°F (varies by model)
Filter Size: Standard 16x25x1 inch or model specific
Control Voltage: 24V AC
Maximum Amperage: 40-80 amps (depending on kW rating)
Operating Temp Range: -30°F to 120°F ambient

Controls and Operation

Access control board via front panel. Main controls: Power switch, Thermostat connections, Diagnostic LEDs.

Operation Sequence: Thermostat call for heat → Control board activation → Blower start delay → Heating element staging → Normal operation → Thermostat satisfied → Heating elements off → Blower cool-down.

Control Board: LED status indicators, DIP switch settings, Terminal connections. Safety Controls: Limit switches, Thermal overload protection, Pressure switches (if equipped).

Electrical Connections

Main power: 240V connection. Control circuit: 24V thermostat connections.

Disconnect all power before making electrical connections.
Follow wiring diagram provided with unit.
Use proper wire gauges per electrical code requirements.
Verify proper grounding and bonding.
Check all connections for tightness and proper termination.

Tip: Always verify power is disconnected with voltage tester before working on electrical components.

Maintenance Procedures

Regular maintenance ensures optimal performance and longevity.

Filter replacement: Replace air filter every 1-3 months depending on usage.
Blower cleaning: Clean blower wheel and housing annually.
Heating elements: Inspect for damage or oxidation annually.
Electrical connections: Check and tighten all connections annually.
Safety devices: Test limit switches and safety controls annually.
Duct inspection: Check ductwork for leaks or obstructions.
Airflow verification: Measure static pressure and adjust as needed.

WARNING! Always disconnect power before performing any maintenance. High voltage present.

Safety Features

Multiple safety systems: High limit switches, Thermal overload protection, Fusible links, Pressure switches (if equipped), Door safety switches.

Care & Cleaning

Disconnect power before cleaning. Use soft brush and vacuum for internal components. Never use water or liquid cleaners.

CAUTION! Do not use compressed air for cleaning as it may damage components. Keep electrical components dry.

Regulatory Information

UL listed and CSA certified. Complies with NEC and local electrical codes. Manufactured to meet industry standards for electric furnace safety and performance. For technical support, contact Nordyne at 1-800-422-4328 or visit www.nordyne.com.

Troubleshooting Guide

Symptom	Possible Cause	Corrective Action
No heat	Power supply, thermostat, limit switch	Check power at disconnect; verify thermostat call; reset limit switches.
Blower not running	Motor, capacitor, control board	Check motor voltage; test capacitor; verify control board output.
Insufficient heat	Heating elements, sequencer	Test heating elements for continuity; check sequencer operation.
Frequent cycling	Filter, airflow, limit switch	Replace dirty filter; check for airflow restrictions; test limit switches.
Circuit breaker trips	Short circuit, overload	Check for grounded heating elements; verify proper wire sizing.
Blower runs continuously	Thermostat, control board	Check thermostat fan setting; test control board relay.
Burning smell	Dust accumulation, electrical issue	Clean heating elements; inspect for overheated wiring.

Reset Procedure: Turn off power for 5 minutes to reset control board.

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