American Granby 4cb-00-fan0-00 Fan Timer Board

Product Description

The AMERICAN GRANBY 4cb-00-fan0-00 is an electronic fan timer board designed for HVAC systems that require controlled blower motor sequencing. It introduces a 45-second delay to fan operation, allowing heat exchangers to reach operating temperature before airflow begins and keeping residual heat from dissipating immediately after the burner shuts off. Rated for 18 to 30 volts, this control board fits into standard low-voltage control circuits common in residential forced-air heating systems. Licensed HVAC technicians typically handle installation as part of routine control board replacement or system troubleshooting.

This fan timer board is suited for residential forced-air furnace applications where blower timing control is needed to improve comfort and system efficiency. It functions as a direct replacement for the Honeywell St9103A1028, making it a practical service part for technicians maintaining compatible systems. The board manages the sequence between burner ignition and blower activation, reducing cold-air delivery at startup and heat waste at shutdown.

Key Features

• 45-second fan delay timing for controlled blower sequencing on startup and shutdown
• Operating voltage range of 18 to 30 volts for compatibility with standard low-voltage HVAC control circuits
• Electronic air board design for reliable, solid-state fan timing control
• Replaces Honeywell St9103A1028 for straightforward field substitution

Compatibility

Designed as a direct OEM-style replacement for the Honeywell St9103A1028 fan timer board in residential forced-air heating systems requiring low-voltage electronic blower control.

Installation Notes

Installation should be performed by a licensed HVAC technician. Always shut off power at the disconnect and set the thermostat to the off position before removing or installing any control board. Verify that system voltage falls within the 18 to 30 volt operating range before energizing the new board. Follow applicable local codes and manufacturer wiring diagrams when reconnecting low-voltage control wiring.

Technical Specifications

• Fan Delay Timing: 45 seconds
• Operating Voltage: 18 to 30 volts
• Replaces: St9103A1028

Standard Information

• Brand: AMERICAN GRANBY
• Manufacturer Part Number: 4cb-00-fan0-00