Atwood 37357 Motor Kit Instruction Manual

1. Introduction

This manual provides essential information for the proper installation, operation, and maintenance of your Atwood 37357 Motor Kit. This kit is designed as a replacement furnace motor for Atwood 8531-35-III and DC89-III furnace models. Please read this manual thoroughly before proceeding with installation or operation to ensure safety and optimal performance.

2. Safety Information

WARNING: This product may contain materials cautioned by California Proposition 65. Always follow local and national electrical codes and safety regulations when installing or servicing furnace components. Disconnect all power to the furnace before beginning any work. Failure to do so can result in serious injury or death.

It is recommended that installation be performed by a qualified technician.

3. Product Overview and Components

The Atwood 37357 Motor Kit includes the replacement furnace motor and associated wiring. It is designed to replace the original motor in compatible Atwood furnace models.

What's in the Box:

• Atwood 37357 Motor Kit (includes motor and wiring)

4. Installation Instructions

Tools Required:

• Screwdrivers (Phillips and Flathead)
• Wrenches or Socket Set
• Wire Strippers/Crimpers (if new connectors are needed)
• Multimeter (for testing electrical connections)

Procedure:

1. Disconnect Power: Ensure all power to the furnace unit is completely disconnected at the circuit breaker or fuse box before beginning any work. Verify with a multimeter.
2. Access Furnace: Locate and open the access panel(s) to the furnace motor compartment. This may involve removing screws or latches.
3. Identify Old Motor: Carefully observe how the existing motor is mounted and connected. Note the wiring configuration (color-coding, terminal connections). Taking photos can be helpful.
4. Disconnect Wiring: Disconnect the electrical wires from the old motor. Pay attention to which wire connects to which terminal.
5. Remove Old Motor: Unfasten any mounting bolts, clamps, or screws securing the old motor. Carefully remove the motor from its housing. Be aware that the blower wheel (squirrel cage) may be attached to the motor shaft and might need to be removed from the old motor and transferred to the new one. It is highly recommended to inspect the blower wheel for damage or wear and consider replacing it if necessary, as it can be fragile.
6. Install New Motor: Position the new Atwood 37357 motor in the furnace housing. If transferring the blower wheel, ensure it is securely fastened to the new motor shaft. Secure the motor using the existing mounting hardware or the provided clamp (Figure 3.2). Ensure the motor is firmly seated and does not wobble.
7. Connect Wiring: Connect the electrical wires to the new motor, matching the configuration noted in step 3. The Atwood 37357 motor typically uses red and black wires with spade connectors. Ensure connections are secure and insulated.
8. Reassemble: Close and secure all furnace access panels.
9. Restore Power: Restore power to the furnace unit at the circuit breaker or fuse box.
10. Test Operation: Initiate a heating cycle to test the new motor. Listen for unusual noises and ensure proper airflow. The motor should operate smoothly and quietly.

5. Operation

The Atwood 37357 motor is an integral component of your furnace's blower assembly. Once properly installed, its operation is automatic, controlled by the furnace's thermostat and control board. When the thermostat calls for heat, the furnace control board will activate the motor, which in turn spins the blower wheel to circulate heated air throughout your RV or home.

Normal Operation:

• Upon activation, the motor should start smoothly with minimal noise.
• A consistent airflow should be felt from the furnace vents.
• The motor will continue to run until the thermostat's set temperature is reached or the heating cycle completes.

6. Maintenance

The Atwood 37357 motor is designed for long-lasting reliability and typically requires minimal maintenance. However, periodic checks can help ensure its longevity and efficient operation.

• Annual Inspection: It is recommended to have your furnace, including the motor, inspected annually by a qualified technician. They can check for wear, proper lubrication (if applicable to your specific motor type, though many modern motors are sealed), and electrical connections.
• Clean Blower Wheel: Over time, dust and debris can accumulate on the blower wheel (squirrel cage), reducing airflow and putting strain on the motor. Periodically inspect and gently clean the blower wheel if accessible, ensuring power is disconnected first.
• Check Air Filters: Ensure your furnace air filters are clean and replaced regularly according to your furnace manufacturer's recommendations. Clogged filters can restrict airflow, causing the motor to work harder and potentially overheat.
• Listen for Unusual Noises: Pay attention to any new or unusual noises coming from the furnace, such as squealing, grinding, or rattling. These can indicate a developing issue with the motor or blower assembly.

7. Troubleshooting

If you experience issues with your furnace after motor replacement, consider the following common troubleshooting steps:

If troubleshooting steps do not resolve the issue, it is recommended to contact a qualified HVAC technician for further diagnosis and repair.

8. Specifications

9. Warranty and Support

Atwood provides a 5-year EU Spare Part Availability Duration for this product, indicating that spare parts will be available for at least five years from the date of manufacture. For specific warranty terms and conditions, please refer to the documentation provided with your original furnace unit or contact Atwood customer support directly.

For technical assistance or inquiries regarding the Atwood 37357 Motor Kit, please visit the official Atwood website or contact their customer service department. Always provide your product model number (37357) when seeking support.