This HVAC high limit control is built to stringent standards

pressure for stable LPG combustion

Doing so allows large debris to short out the ionizing wires

This indicates that the electrical contacts are normally closed and will move to the open position when the sensed pressure rises to the 1

you can always go up in voltage rating but never down

Resideo 50001464-004 Sensor Assembly This HVAC high limit controlThe Resideo 50001464 004 Sensor Assembly is a critical replacement component for residential and light commercial boiler systems. Designed for technical precision, this 36 inch leadwire sensor provides real time temperature feedback to Honeywell Electronic Aquastat Controllers, including the L7224A, L7248C, and L7248L series. This assembly is a drop in replacement for the 50001464 004 B and includes a pre terminated Molex connector and mounting