Carrier HH18HA017 Limit Switch Els PW 17895 Veteran technicians recognize this as

Veteran technicians recognize this as a vital safeguard against heat exchanger rollout or blower motor failure

featuring a 1 3/4" Rotolock suction connection with a 1 1/8" ODF sleeve and a 1 1/4" Rotolock discharge with a 3/4" ODF sleeve

For contractors maintaining Argo electric hydronic blocks

Fine-tuning the BMS controller offset is recommended for low-end accuracy

Carrier HH18HA017 Limit Switch Els PW 17895 Veteran technicians recognize this asThe Carrier HH18HA017 is a critical safety component designed for precise thermal management in high performance HVAC systems. This L170 40F limit switch functions as a primary high limit control, monitoring the heat exchanger or plenum temperatures to prevent equipment damage. When the internal temperature reaches the 170F threshold, the internal bimetal disc interrupts the electrical circuit to the burner or heating elements. As the system cools to