Replacing the old unit with a new Carrier HN680067 restores proper circuit interruption and control

the switch opens due to a low refrigerant charge

and upper spring seat

and Arcoaire part number 1171434

Daikin-McQuay 065498401 Control 320720-756 Replacing the old unit withThe Daikin McQuay 065498401 Control is a heavy duty DPST HVAC controller engineered for precision temperature management within the 55 65F range. Designed for high performance commercial HVAC systems, this unit supports multi tap voltage configurations including 120V, 208V, and 240V AC, providing versatile power compatibility for retrofits and new installations alike. Its Double Pole Single Throw (DPST) architecture ensures reliable switching of both