PENN COMMERCIAL REFRIGERATION
PRESSURE CONTROLS
ADJUSTABLE DIFFERENTIAL PRESSURE SWITCH
P74
DIFFERENTIAL PRESSURE
The P74 series of differential pressure switches incorporate two opposing pressure elements and an adjustable range setpoint spring with a calibrated scale .
The control switches at the indicated setpoint on an increase in differential pressure and switches back to the normal position when the different pressure decreases to the setpoint less the mechanical switching differential .
FEATURES
• Heavy duty pressure elements .
• These controls may be used in combination with series P28 lube oil protection control on two compressor , single motor units .
APPLICATION
These controls are designed to sense pressure differences between two points and may be used as operating or limit controls . Typical applications are to detect flow across a chiller or water cooled condenser , to detect flow in a heating system and sensing lube oil pressure differential on refrigeration compressors .
35 - REFRIGERATION
European Products Catalogue 2021