McDonnell & Miller 51-S-2-HD Cut Off Els PW 17895 the York S1-022-08912-000 is specifically

the York S1-022-08912-000 is specifically charged and calibrated for R22 refrigerant

making it suitable for most supply or return air locations in standard HVAC applications

Key Benefits Fail-Safe Operation: The 2-wire spring return actuator ensures the damper defaults to an open position during power loss

electrical connectors and RPM ratings vary

Common Questions: Is the 93G91 compatible with older Lennox G-series units

McDonnell & Miller 51-S-2-HD Cut Off Els PW 17895 the York S1-022-08912-000 is specificallyThe McDonnell & Miller 51 S 2 HD (Part Number 136200) serves as a heavy duty head mechanism only for professional grade water level control. Engineered for high capacity low pressure steam and hot water boiler systems, this unit integrates a mechanical water feeder with a low water cut off (LWCO) function via a built in Snap Acting SPDT switch (No. 2 Switch). It is designed to handle a maximum vessel pressure of 35 PSI and an inlet water supply up to