Fasco A157 Furnace Draft Inducer Blower Instruction Manual

1. Important Safety Information

SAFETY WARNING: This motor must be grounded in accordance with local or national electrical codes to prevent electrical shock or injury due to possible electrical shock.

• Always disconnect power to the furnace before attempting any installation, maintenance, or repair.
• Installation and servicing should only be performed by a qualified HVAC technician.
• Wear appropriate personal protective equipment (PPE) such as safety glasses and gloves.
• Ensure all electrical connections are secure and properly insulated.
• Do not operate the furnace if the draft inducer blower is damaged or malfunctioning.

2. Product Overview

The Fasco A157 is an OEM authorized draft inducer blower designed for various furnace models. It is a critical component responsible for drawing combustion gases out of the furnace and venting them safely. This unit operates at 115V and 3000 RPM, ensuring efficient and reliable performance for your heating system.

This image displays the Fasco A157 furnace draft inducer blower. The main components visible are the metallic scroll housing, the electric motor with copper windings, and the electrical connection points. A safety warning label is affixed to the motor housing.

3. Specifications

4. Installation Instructions (Setup)

Installation of the Fasco A157 draft inducer blower should only be performed by a qualified HVAC technician. Improper installation can lead to unsafe operation, property damage, or personal injury.

1. Power Disconnection: Ensure the main power supply to the furnace is completely disconnected at the circuit breaker or fuse box before beginning any work.
2. Access and Removal: Gain access to the existing draft inducer blower. Carefully disconnect any electrical wiring, vacuum lines, and mounting hardware. Note the orientation and connections for proper reinstallation.
3. Surface Preparation: Clean the mounting surface on the furnace to ensure a proper seal. A new high-temperature gasket (typically not included with the blower) is often required for an airtight seal. Refer to your furnace manufacturer's specifications for the appropriate gasket material.
4. Mounting the New Blower: Position the Fasco A157 in the correct orientation and securely fasten it using the appropriate mounting screws. Ensure there is no wobble or excessive movement.
5. Electrical Connections: Connect the electrical wiring to the new blower according to the furnace's wiring diagram. Ensure all connections are tight and properly insulated. Verify proper grounding as per safety warnings.
6. Vacuum Lines: Reconnect any vacuum lines or pressure switch hoses to their designated ports on the new blower.
7. Testing: Once installation is complete, restore power to the furnace. Initiate a heating cycle and carefully observe the blower's operation and the furnace's ignition sequence. Check for any unusual noises, vibrations, or gas leaks.

5. Operating Instructions

The Fasco A157 draft inducer blower operates automatically as part of your furnace's heating cycle. When the thermostat calls for heat, the inducer blower activates first to create a negative pressure within the combustion chamber. This action ensures proper airflow for safe and efficient burning of fuel and purges any residual gases from the heat exchanger before ignition.

The blower continues to operate throughout the heating cycle and for a short period after the main burner shuts off to ensure all combustion byproducts are safely vented out of the system. No manual intervention is typically required for its operation.

6. Maintenance

Regular maintenance helps ensure the longevity and efficient operation of your Fasco A157 draft inducer blower and overall furnace system.

• Annual Inspection: Have a qualified HVAC technician inspect the draft inducer blower annually as part of routine furnace maintenance.
• Debris Check: Periodically inspect the blower wheel and housing for any accumulation of dust, lint, or other debris that could impede airflow or cause imbalance. Clean if necessary, ensuring power is disconnected.
• Visual Inspection: Check for signs of wear, corrosion, or damage to the motor, wiring, and housing. Address any issues promptly.
• Clearance: Ensure the area around the furnace and blower remains clear of obstructions to allow for proper ventilation.

7. Troubleshooting

If you experience issues with your furnace, the draft inducer blower may be a contributing factor. Always disconnect power before inspecting components.

• Noisy Operation: If the blower is making unusual squealing, grinding, or rattling noises, it could indicate worn motor bearings, an imbalanced blower wheel, or debris lodged within the housing. Inspection and potential replacement may be necessary.
• Furnace Not Starting: A malfunctioning draft inducer blower can prevent the furnace from igniting. Check if the blower is receiving power and if it attempts to start. Verify that the pressure switch (often connected to the inducer) is functioning correctly, as it signals the furnace that safe venting conditions are met.
• Excessive Vibration: Strong vibrations can be caused by loose mounting hardware, an unbalanced blower wheel, or a failing motor. Ensure the unit is securely mounted and free of obstructions.
• No Air Movement: If the blower motor runs but no air is being moved, check for blockages in the exhaust vent or a detached blower wheel.

For complex issues or if you are unsure about diagnosing a problem, contact a qualified HVAC technician.

8. Warranty Information

As an OEM authorized part, the Fasco A157 draft inducer blower is subject to the manufacturer's standard warranty terms and conditions. Specific warranty details, including coverage period and claim procedures, are typically provided with the product packaging or available directly from Fasco. Please refer to Fasco's official documentation or contact their customer support for specific warranty information.

9. Customer Support

For technical assistance, installation guidance, or troubleshooting beyond the scope of this manual, it is recommended to contact a certified HVAC professional. For product-specific inquiries or warranty claims, please reach out to Fasco customer support through their official website or contact channels.