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Johnson Control Penn Pressure Switch

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The P77 series pressure controls may be used for control functions or limit functions, depending on model number. All models are provided with alarm contacts. All standard models have phosphor bronze bellows and brass pressure connections. Models for use with ammonia are provided with stainless steel bellows and connectors.

Devices conforming to PED 97/23/EC Cat. IV (HP models) have the fail-safe function with double bellows.

Their IP54 classification means that these pressure controls are suitable for almost all applications.


These pressure controls are designed for use in a variety of applications involving refrigeration high or low pressure.

Models supplied have a “whole range” design, enabling them to be used with refrigerants R22, R134A, R404A, R410A and all other non-corrosive refrigerants which are within the operating range of the control. They may also be used for other high or low pressure applications such as air, water etc. Models which can be used with ammonia are included in the program. Also models tested and approved to PED 97/23/EC Cat. IV (supersedes DIN and TUV approval) are included in the program.

  • Generous wiring space
  • Splash-proof enclosure (IP54)
  • SPDT contacts are provided as standard on single pressure controls
  • Trip-free manual reset