Coleman 3400 Series Electric Furnace Manual

The Coleman 3400 Series Electric Furnace is a high-efficiency residential heating system designed for reliable performance and energy savings. This furnace features multiple heating stages, advanced airflow management, durable construction, and user-friendly controls. Below are key sections covering 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. Electrical Connections 7. Operation 8. Maintenance 9. Care & Cleaning 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Electric heating elements, blower assembly, control board, air filter, limit switches, and safety controls.

Feature	Description
Heating Elements	Multiple staged electric heating elements for efficient operation
Blower Assembly	Variable speed ECM motor for optimal airflow
Control Board	Microprocessor-based control for precise temperature regulation
Air Filter	Standard 1-inch filter for air quality protection
Limit Switches	Safety devices to prevent overheating
Thermostat Connection	Compatible with standard 24V thermostats
Service Light	LED indicator for maintenance alerts
Access Panels	Removable panels for easy service access
Drain Connection	For humidifier installation if applicable
Power Disconnect	Required safety disconnect switch

Installation

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

Position furnace: Place on stable, level surface with proper clearances (minimum 24 inches front, 6 inches sides).
Ductwork connection: Connect supply and return ducts securely.
Electrical connections: Route power wiring through conduit to disconnect switch.
Thermostat wiring: Connect 24V thermostat wires to control board.
Install air filter: Insert clean filter in filter rack.

WARNING! Installation must be performed by qualified HVAC technician. Ensure power is disconnected during installation.

First-Time Setup

After installation, perform initial startup procedure.

Power verification: Ensure proper voltage (208/240V) at disconnect switch.
Thermostat setup: Program thermostat for heating mode and desired temperature.
System check: Verify blower operation and heating element sequencing.
Airflow verification: Check supply air temperature and airflow patterns.
Safety test: Verify limit switches and safety controls function properly.

CAUTION! Do not bypass safety devices. Test all safety functions before regular use.

Specifications

Model Series: 3400 Series Electric Furnace
Voltage: 208/240V AC, 60Hz
Heating Capacity: 5kW to 20kW (model dependent)
Blower Type: Variable speed ECM
Airflow: 600-1400 CFM
Filter Size: 16x20x1 inches (standard)
Operating Temp Range: 45°F to 120°F ambient
Safety Certifications: UL, ETL listed
Warranty: 10 years heat exchanger, 5 years parts

Controls and Settings

Access control board via front service panel. Thermostat controls heating operation.

Control Board: LED status lights, diagnostic codes, reset button, dip switch settings.

Heating Stages: Multiple stage operation for efficiency. Blower Control: Automatic delay on start/stop. Temperature Limits: High limit protection. Diagnostic Codes: Flash patterns for troubleshooting. Dip Switches: Heating capacity selection, blower speed settings.

Electrical Connections

Power supply: 208/240V dedicated circuit. Thermostat: 24V control circuit.

Disconnect power at main breaker before servicing.
Verify proper wire sizing per local codes.
Connect line voltage to disconnect switch.
Route low voltage thermostat wires to control board.
Ground all electrical components properly.

Tip: Use copper conductors only. Follow NEC and local electrical codes.

Operation

Standard heating cycle operation and user controls.

Thermostat call: Set thermostat above room temperature.
Blower start: Blower begins operation after brief delay.
Heating stage: First heating element energizes.
Additional stages: Subsequent elements engage as needed.
Temperature satisfaction: Heating elements de-energize when setpoint reached.
Blower off: Blower continues running for post-purge cycle.

WARNING! Do not operate with access panels removed. Keep combustible materials away from furnace.

Maintenance

Regular maintenance schedule for optimal performance.

Monthly: Check and replace air filter as needed.
Seasonal: Inspect electrical connections and components.
Annual: Professional inspection and cleaning.
Blower maintenance: Clean blower wheel and housing annually.
Safety check: Test limit switches and safety controls.

CAUTION! Always disconnect power before performing any maintenance.

Care & Cleaning

Disconnect power before cleaning. Use soft brush and vacuum for interior cleaning.

CAUTION! Do not use water or liquid cleaners. Keep electrical components dry.

Regulatory Information

UL Standard 1995: Heating and cooling equipment. Complies with NEC and local building codes. Copyright © 2023 Coleman; trademarks of Johnson Controls. For technical support, visit www.colemanac.com or contact 1-800-626-2000.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No heat	Power supply, thermostat, limit switch	Check circuit breaker, thermostat setting, reset limit switch.
Blower not running	Motor, capacitor, control board	Verify power to blower, check capacitor, inspect control board.
Insufficient heat	Dirty filter, duct restrictions	Replace air filter, check for blocked ducts.
Frequent cycling	Dirty filter, oversized unit	Clean/replace filter, verify proper unit sizing.
Error codes flashing	Various system faults	Refer to diagnostic code chart in service manual.

Reset: Power cycle at disconnect switch if system locks out.

Service: 1-800-626-2000; www.colemanac.com