The F262 Series Airflow Switch detects airflow or the absence of airflow only in response to the velocity of air movement within a duct. You can wire the switch to open one circuit and close a second circuit, single-pole, double-throw (SPDT), for either signaling or interlock purposes.
Airflow failure during the normal operation of air handling systems may cause overheating, coil icing, or other conditions that may be detrimental to the equipment.
Typical applications include:
- Make-up air systems
- Air cooling or heating processes
- Exhaust systems
The switch has a Type 3R/IP43 enclosure with an integral mounting plate. A mounting plate gasket is supplied with each control.
The enclosed SPDT Penn switch has color-coded terminals for ease of wiring. The control is factory set at approximately the minimum flow rate. See Table 1. You must not set the control any lower than the factory setting because the control may fail to return to a no-flow condition. If you require a higher flow rate setting, turn the range adjusting screw clockwise.
Mount the F262 switch on the top, side, or bottom of a duct in a horizontal position whenever possible. If vertical duct mounting is required and the flow is downward, you must readjust the control. If the flow is upward, refer to Table 1 for minimum flow required to actuate the control.
The switch is not designed for use where it is exposed to outside weather.