The sensor is designed to protect the pool and spa equipment and plumbing against freeze damage.
Product Review
Product Description
The sensor is designed to protect the pool and spa equipment and plumbing against freeze damage. The sensor plugs into the circuit board on the back of the FP1102T/PF1103T and turns ON the filter pump when air temperature drops below the programmed temperature. The freeze programming mode will not appear unless the sensor is plugged into the clock.