Johnson P78 Series Pressure Switch P78lca-9300

Johnson Pressure Switches

Johnson P78 Series Pressure Switch P78lca-9300

FEATURES
• Splash-proof enclosure (IP54)
• Trip-free manual reset
• Patented separate alarm contacts for both low pressure and high
• pressure cut-out (except P78ALA)

Dual Pressure for IP54 Applications The P78 series pressure controls may be used for control functions or limit functions, depending on model number. 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 DIN 32733 have a double bellows on the high pressure versions.

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 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.