Common Questions What is the difference between this and a standard T&P valve

preventing the furnace from firing as a safety measure

ensuring the flame remains precisely positioned to satisfy the safety circuit

you must ensure a ground reference is established

Universal Compatibility: Functions as a direct cross-reference for Mars

KMC Controls MEP-3503 Actuator Els PW 17895 Common Questions What is theThe KMC Controls MEP 3503 Actuator is a precision engineered 24VAC zone actuator designed for high reliability on off control in HVAC systems. Built with an internal spring return (S R) mechanism, this normally open (N O) unit ensures a fail safe position during power loss, making it a staple for critical dampening and VEZ series valve applications. For technicians, the MEP 3503 provides a streamlined installation with its compact 2 position design,