Johnson Controls P78 Installationsanweisungen

PSC9705
Introduction
These dual 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 models are also tested and
approved according to PED 97/23CE Cat. IV
Description
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. Their
IP54 classification means that these pressure
controls are suitable for almost all applications.
! 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)
© 2002 Johnson Controls Inc.
Order No. PD-P78-E
P
RODUCT
Series P78
Dual Pressure Controls for Refrigeration,
Air-conditioning and Heatpump Applications
Feature and Benefits
European Refrigeration Controls Catalogue
B
ULLETIN
P78 Dual Pressure Control for
Easy wiring and maintenance
Can be used for indoor/outdoor applications
Override is not possible in the control
function
Easy monitoring of the fault location
Catalog Section 6
Product Bulletin P78
Issue 03/04/2002
Refrigeration
Catalogue Section 6