this part is specifically designed for VHE Series gas boilers

Rugged Build: Engineered to withstand the extreme thermal cycling and vibration inherent in outdoor condenser environments

this high limit temperature switch monitors plenum temperatures and provides a fail-safe against overheating

Standard L4008A models often require a separate immersion well if one is not already present in the piping or boiler tapping

It is natively compatible with unit heaters

Trane CNT4960 Control 321894-706 this part is specifically designedThe Trane CNT4960 (also identified as CNT04960) is a high performance OEM high pressure control switch engineered for critical system protection in commercial and residential HVAC units. This SPST normally closed safety switch is designed to monitor discharge line pressure, effectively preventing compressor damage by opening the circuit when pressures reach 650 PSI. The control automatically resets and closes once the system pressure stabilizes at 550