Description
Carrier HF660005 Filter On Off Switch Relay With Assembly 70Lb TRQ is a switch used to control air filters in HVAC systems. It functions through the tracking of the pressure differential across the air filter. When the filter is full and there is limited airflow, then the pressure differential rises. The relay then feels this pressure change and sends a signal to shut off the HVAC system so that it does not struggle to overcome a clogged filter. This serves to guard the equipment and keeps the environment as a receptacle to the airflow properly ventilated. This relay switch is normally used in commercial HVAC systems especially those that have large air handling units and large heavy-duty air filters.
