P78 Adjustable Pressure Switch

Dual Pressure, IP54
The P78 series pressure controls may be used for control functions
or limit functions, depending on model number.

Product Description

All models are provided with alarm contacts (except P78ALA).
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 have a double bellows on
the high pressure versions.
Their IP54 classification means that these pressure controls
are suitable for almost all applications.
Features
zzHigh refrigerant pressure.
Suitable for R410A and CO2 subcritical applications
•Gold plated contacts
•Generous wiring space
•Splash-proof enclosure (IP54)
•Trip-free manual reset
•Patented separate alarm contacts for both low pressure and high
pressure cut-out (except P78ALA)
Application
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, CO2
and all other noncorrosive 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.

Technical Document