The fail-safe direction (CW or CCW) is determined by a physical selector switch located under the cover

it supports conventional or reverse mounting

though the control range is limited by the installed spring (20-200 PSI for this unit)

65" WC rating indicate

Steam Compatible: Unlike brass-trim models

Marvair K/40055 Control mario The fail-safe direction (CW orThe Marvair K 40055 Low Ambient Fan Cycle Control is a critical genuine OEM replacement part engineered for telecommunication and schoolroom HVAC systems. Designed specifically to maintain head pressure by regulating the condenser fan operation, this control ensures the refrigeration cycle remains stable within its design parameters during low temperature outdoor conditions. As a direct replacement for Marvair S 03998 and 70555, it eliminates the