European Refrigeration Controls Catalogue
Catalog Section
6
Product Bulletin
P77
Issue
13/05/2003
© 2003 Johnson Controls Inc
Catalogue Section 6
Order No. PD-P77-E
PSC1302
Series P77
Single Pressure Controls for Refrigeration,
Air-conditioning and Heatpump Applications
Introduction
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 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 as well as
controls tested, conforming to DIN 32733, and
approved by TÜV are included in the program.
DIN (HP) models are also tested and approved
according to PED 97/23EC Cat. IV.
Description
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 DIN 32733
have a double bellows on the high pressure
versions. Their IP54 classification means that
these pressure controls are suitable for almost
all applications.
P77 Single Pressure Control
for Refrigeration
Feature and Benefits
Generous wiring space
Easy wiring and maintenance
Splash-proof enclosure (IP54)
Can be used for indoor/outdoor applications
SPDT contacts are provided as
standard on single pressure
controls.
Trip-free manual reset
Can be wired for alarm functions
Override is not possible in the control function
