Nordyne Intertherm Electric Furnace Manual

The Nordyne Intertherm Electric Furnace is a high-efficiency heating system designed for residential use, featuring multiple heating elements, integrated blower system, thermal safety controls, and compatibility with standard thermostat controls. Below are key sections for safety, features, installation, operation, maintenance, and troubleshooting.

1. Features at a Glance 2. Installation Requirements 3. Electrical Connections 4. Specifications 5. Controls and Settings 6. Operation Procedures 7. Maintenance Schedule 8. Safety Features 9. Cleaning & Care 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Heating elements, blower assembly, control board, thermal limit switches, transformer, and access panels.

Feature	Description
Heating Elements	Multiple staged heating elements for efficient operation
Blower Assembly	Variable speed blower for consistent air circulation
Control Board	Microprocessor-controlled operation with diagnostic LEDs
Thermal Limit Switches	Safety devices to prevent overheating
Transformer	24V control circuit power supply
Access Panels	Removable panels for service and maintenance
Sequence Controls	Staged heating element activation
Air Flow Switch	Ensures proper airflow before heating
High Limit Control	Automatic shutdown if temperatures exceed safe limits
Door Safety Switch	Disables operation when access panels are removed

Installation Requirements

Proper installation is critical for safe and efficient operation.

Location: Install in dry, well-ventilated area with adequate clearance
Ductwork: Ensure proper duct sizing and sealing
Electrical: Required 240V AC power supply with appropriate circuit breaker
Thermostat: Compatible 24V thermostat with heat-only operation
Clearances: Maintain minimum clearances as specified in manual

WARNING! Installation must be performed by qualified HVAC technician. Improper installation can cause fire hazard or equipment damage.

Electrical Connections

Follow all local electrical codes and manufacturer specifications.

Disconnect all power before making electrical connections
Connect line voltage wiring to appropriate terminals (L1, L2)
Connect low voltage thermostat wiring (R, W, C, G)
Verify proper grounding and circuit protection
Check all connections for tightness and proper wire sizing

CAUTION! Electrical work should only be performed by licensed electrician. Verify voltage and phase requirements before connection.

Specifications

Voltage: 240V AC, 60Hz
Heating Capacity: Various models from 30,000 to 60,000 BTU
Element Stages: 2 to 5 stages depending on model
Blower Motor: Multi-speed PSC or ECM motor
Air Flow: Adjustable CFM settings
Temperature Rise: 35-70°F across heat exchanger
Control Voltage: 24V AC
Maximum Amperage: Varies by model (check rating plate)
Operating Temp Range: -30°F to 120°F ambient

Controls and Settings

Access control board via front service panel. LED indicators show system status.

Thermostat Connections: R (24V hot), W (heat), G (fan), C (common)

Blower Settings: Adjust blower speed taps for proper airflow. Limit Controls: Automatic reset high limit switches. Element Sequencing: Staged activation based on heating demand. Diagnostic LEDs: Flash codes indicate specific operational status or fault conditions.

Operation Procedures

Normal operation is controlled by thermostat settings.

Set thermostat to desired temperature
System initiates heating sequence when temperature drops below setpoint
Blower activates after warm-up delay
Heating elements stage on as needed to maintain temperature
System cycles off when setpoint is reached

Tip: Allow system to complete full heating cycle before adjusting thermostat settings.

Maintenance Schedule

Regular maintenance ensures optimal performance and longevity.

Monthly: Check and replace air filters
Seasonal: Inspect heating elements and electrical connections
Annual: Professional inspection and cleaning
As needed: Clean blower assembly and check motor bearings
Biannual: Verify safety controls and limit switches

WARNING! Disconnect all power before performing any maintenance. Only qualified technicians should service electrical components.

Safety Features

Multiple safety systems protect against hazardous conditions.

High Limit Switches: Automatic shutdown if temperatures exceed safe limits. Door Safety Interlock: Prevents operation when access panels are removed. Fusible Links: Protect against electrical overloads. Air Flow Monitoring: Ensures proper ventilation before heating activation. Thermal Fuses: Non-resettable protection against overheating.

Cleaning & Care

Regular cleaning maintains efficiency and prevents malfunctions.

Air Filters: Replace monthly during heating season. Blower Assembly: Vacuum annually. Heating Elements: Professional cleaning only. Exterior: Wipe with dry cloth. Condensate Drain: Clear if applicable.

CAUTION! Never use water or cleaning solutions on electrical components. Always disconnect power before cleaning.

Regulatory Information

UL Listed: Complies with UL Standard 1995. CSA Certified: Meets Canadian Standards Association requirements. NEC Compliance: Designed per National Electrical Code. For technical support, contact Nordyne at 1-800-422-4328 or visit www.nordyne.com. Copyright © Nordyne LLC. All rights reserved.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No heat	Power supply, thermostat, limit switch	Check circuit breaker, verify thermostat settings, reset limit switches
Insufficient heat	Dirty filters, duct issues, element failure	Replace filters, check ductwork, test heating elements
Blower not running	Motor, capacitor, control board	Check motor operation, test capacitor, verify control signals
Frequent cycling	Dirty filters, oversized unit, thermostat location	Clean/replace filters, verify proper sizing, relocate thermostat
Strange odors	Dust accumulation, electrical issues	Clean system, inspect electrical connections
Circuit breaker trips	Short circuit, overload, ground fault	Inspect wiring, check element resistance, verify proper circuit sizing

Reset: Turn power off for 5 minutes then restore. Check diagnostic LED codes.

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