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230 VAC Factory Direct Differential Control Pressure Switch Without Time Delay (Johnson Controls, Pe

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230 VAC Factory Direct Differential Control Pressure Switch Without Time Delay (Johnson Controls, Penn)


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.


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



These controls are designed for use only

as operating controls. Where an operating

control failure would result in personal

injury or loss of property it is the

responsibility of the installer to add devices

or systems that protect against, or warn of,

control failure.

Feature and Benefits

•Heavy duty pressure elements. Withstands high overrun pressures.

•These controls may be used in combination with series P28 lube oil protection control on two compressor, single motor units. Reduces the lube oil system cost.

Product Specifications:

• P (bar) 0.6/4.8

Switching differential (bar) 0.7/2 adj.

Medium Non-corrosive Refrigerant

Pressure connector (style) 5

Electrical rating 15(10)A 230 Vac

Maximum bellows pressure absolute (bar) 23

Maximum allowable diff. in pressure between the bellows (bar) 14

Pressure element material stainless steel/copper

Replaces Part Numbers:


Used In Equipment Model Numbers:

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