For contractors managing building automation systems (BAS) or legacy pneumatic control loops

though effective working limits are often governed by the valve core

5 screw terminals are designed to accommodate up to 2 x 2

crucial for maintaining proportional pneumatic signals

For service technicians and mechanical contractors

Carrier HH18HA490 Rollout Switch For contractors managing building automationThe Carrier HH18HA490 Rollout Switch is a critical safety component designed for high efficiency gas furnaces. This manual reset rollout switch is engineered to monitor temperatures within the burner compartment, providing essential protection against flame rollout conditions. Functioning as a Single Pole Single Throw (SPST) device, it is calibrated to open the electrical circuit at approximately 290 degrees F, effectively shutting down the system if