Description
The Johnson Controls P74BA-9 Ammonia Differential Pressure Control on the other hand is a particular equipment that is intended for use in HVAC systems that use ammonia as the refrigerant in question. This makes the system run at its most optimal efficiency since it measures the pressure difference between two locations. It has a setpoint of 10 Psi and a pressure range of 8-70 Psi, as a result of which pressure change is effectively controlled and enhanced system stability and performance is achieved. The control switch of this configuration is in the SPST (Single Pole Single Throw) design that is for maintaining reasonable operating pressures in cold storage, industrial refrigeration, and other HVAC applications using ammonia.
