If the circuit is open while the unit is cool

Durable Molded Design: The solid block filter drier construction eliminates desiccant attrition

it's designed for optimal performance in systems utilizing chilled or hot water

and relays in residential and light commercial heating and cooling systems

Utilizing a nitrile seal material (Buna-N)

Lochinvar & A.O. Smith 100166256 Pressure Switch Els PW 17895 If the circuit is openThe Lochinvar & A. O. Smith 100166256 Pressure Switch is a critical safety and operational component designed for high performance hydronic systems and commercial water heaters. This SPDT Pressure Switch (Single Pole Double Throw) functions as a direct OEM replacement part for the now obsolete PRS3406, PRS2406, and 100166157 models. Engineered with a precision 1 4" barb connection, it monitors system pressure within a 1 5 PSI range, ensuring the