Honeywell Bimetal Disc Controls

Overview

The HONEYWELL 3f01-350 is a snap disc fan switch control used in high-temperature airflow applications to automatically open and close a fan circuit based on temperature thresholds. The switch activates at a cut-in temperature of 350 degrees F and deactivates at a cut-out temperature of 320 degrees F. This bimetal snap disc design provides reliable, self-actuating switching without external power to the sensing element. It is commonly installed by HVAC technicians in furnaces, duct heaters, and similar heating equipment where automatic fan activation and shutdown based on heat exchanger temperature is required. This snap disc fan switch is suited for residential and light commercial heating applications where a fixed-temperature fan control is needed. It mounts directly in the airstream or on the heat exchanger surface and responds to rising and falling temperatures to cycle the indoor blower. It is typically installed during system commissioning, control board replacement, or when an original fan switch has failed or drifted out of calibration. Key Features Cut-in temperature of 350 degrees F initiates fan operation when heat exchanger reaches set point Cut-out temperature of 320 degrees F shuts down fan as system cools Snap disc bimetal design provides positive, repeatable switching action Self-actuating temperature sensing requires no separate power to the sensing element Compact form factor suits direct surface-mount or duct-mount installation Compatibility Designed as…