Carrier HK680016 Pressure Switch 321894-706 and early 53/55 series residential

and early 53/55 series residential heaters

Can I clean the 52M72 flame sensor instead of replacing it

Maintenance-Free Design: No packing nuts to tighten or seats to replace

The unit is constructed with a durable brass body and high-performance NBR seals

The Belimo B313B is rated for a maximum close-off pressure of 200 psi

Carrier HK680016 Pressure Switch 321894-706 and early 53/55 series residentialThe Carrier HK680016 High Pressure Switch is a critical safety component designed for precise refrigerant pressure monitoring in residential and commercial HVAC units. As the direct replacement for HK02AA359, this electronic switch prevents compressor damage by interrupting the control circuit when discharge pressures exceed safe operating limits. Maintaining a cut out range of 90 to 450 PSI, it ensures your system remains within the manufacturer's