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It is standard practice to turn the screw an additional 1/4 turn beyond the threshold to provide operational margin and prevent nuisance switching
the replaceable valve insert and stainless steel spindle allow for maintenance and operator swaps without the need to drain or shut down the entire heating loop
37" WC setpoint is accurate to factory specs
An "OL" reading indicates an open winding
Johnson Controls T-4002-9012 Pneumatic Thermostat 30067439-890 It is standard practice toThe Johnson Controls T 4002 9012 is a high performance, single temperature pneumatic room thermostat designed for precision control in commercial HVAC systems. As a direct acting (DA) controller, this unit provides a proportional output air signal that increases as the space temperature rises, making it an essential component for modulating pneumatic valves and damper actuators in heating and cooling applications. Engineered for vertical mount