Operating Instructions
Pressure Controls PS4 Versions
released for R290 / R1270
Emerson Climate Technologies GmbH
Am Borsigturm 31 I 13507 Berlin I Germany
Date: 19.07.2019
PS4-ATEX_OI_R06_ML_865178.docx
General information:
The Pressure Controls
PS4-…ATEX
are intended to
monitor the pressure and to act as a safety device.
The listed products are electrical operated switches
with ignition source and are in compliance with
EN 60079 / directive 2014/34/EU therefore rated /
marked as:
II 3G ExnA IIA T2Gc U
PS4-…ATEX must be installed in an appropriate
housing to protect them from mechanical damage or
shock.
Safety instructions:
•
Read operating instructions thoroughly. Failure
to comply can result in device failure, system
damage or personal injury.
•
According to EN 13313 it is intended for use by
persons having the appropriate knowledge and
skill.
•
Flammable refrigerants require special handling
and care due to its flammability. Sufficient
ventilation is required during service of the
system. Contact with rapidly expanding gases can
cause frostbite and eye damage. Proper
protective equipment (gloves, eye protection, etc.)
has to be used.
•
In a severely contaminated system, avoid
breathing acid vapors and avoid contact with
skin from contaminated refrigerant / lubricants.
Failure to do so could result in injury.
•
Ensure that the system is correctly labeled with
applied refrigerant type and a warning for
explosion risk.
•
Make sure that the high pressure switch is
installed on high pressure side and low pressure
switch on low pressure side of system. Failure to
do will result in system without protection
against high and low pressure and consequently
risk of explosion and human injury.
•
Do not release any refrigerant into the
atmosphere!
•
Do not exceed the specified maximum ratings for
pressure, temperature, voltage and current.
•
Before opening any system make sure pressure in
system is brought to and remains at atmospheric
pressure.
•
Ensure that the system piping is grounded.
•
Before installation or service disconnect voltage
from system and device.
•
Observe and avoid mechanical damage of
housing in order to maintain protection class.
•
Ensure that design, installation and operation
are according European ATEX Directive, as well
as the according national standards / regulations
are respected.
Installation (Fig. 1):
•
PS4-…ATEX pressure controls should not be
exposed to gas pulsations. When pulsations can be
expected, use a pulsation damper or a capillary tube
connection (min. 1m).
•
Mounting directions per Fig. 1 in order to prevent
the collection of contaminant in pressure sensing
element.
Fig. 1
Brazing (Fig. 2):
•
Perform and consider the brazing joint as per
EN 14324.
•
Before and after brazing clean tubing and brazing
joints.
•
Minimize vibrations in the piping lines by
appropriate solutions.
Fig. 2
Pressure test:
•
After completion of installation, a pressure test must
be carried out according to EN 378 for systems which
must comply with European pressure equipment
directive 2014/68/EU.
•
The max. system test pressure shall be 30 bar for low
pressure side and 41 bar for high pressure side.
Warning:
•
Failure to do so could result in loss of refrigerant
and personal injury.
•
The pressure test must be conducted by skilled
persons with due respect regarding the danger
related to pressure
.
Tightness test:
Conduct tightness test according to EN 378-2 with
appropriate equipment and method to identify tightness
of external joints. The allowable leakage rate must be
according system manufacturer’s specification.
Electrical connection:
•
Entire electrical connections have to comply with
local regulations.
•
Ensure that the cables are mounted without
tension; always leave the cable a bit loose.
•
Ensure that cables are not mounted near sharp
edges.
•
Do not bend or mechanically stress the cable
outlet, maintain a clearance of 20 mm to
neighboring parts.
Operation:
•
Perform a functional test of electrical circuit
before charging the system with refrigerant.
Service / Maintenance:
•
Defective PS4-…ATEX must be replaced; they
cannot be repaired.
•
Disconnect electrical power before service.
•
The lowest pressure inside system must be at least
0.4 bar higher than ambient pressure at any time.
Failure to do so could accumulate air inside the
system and create an explosive mixture over time.
•
Before any debrazing ensure that the flammable
refrigerant is pumped out of the system and the
room around the system is well vented so no
refrigerant left.
Technical Data of PS4-...ATEX:
Max. allowable working
pressure PS
(see table below)
Test pressure PT
(see table below)
Protection class (EN
60529)
IP67
Temperatures
Ambient (housing)
Storage / transportation
Medium
-30°C…+65°C
-30°C…+80°C
-35°C…+135°C
Released / compatible for
R290, R1270
Electrical rating
50mA
max
. at 24VDC
max
Function
Pressure limiter, type
approval EN 12263,
PSL/PSH
Pressure controls PS4-…ATEX are factory preset to
specific switch points (see label). The set points
cannot be modified.
Type of electrical contact
Single pole single throw
(SPST)
Marking
-
ENEC05 and CE
0035
according to PED
2014/68/EU
-
II 3G ExnA IIA T2Gc U
Only PS4-…ATEX types, listed in the following
table, are released for use with flammable
refrigerants!
Type Settings
Part No.
PS
(bar)
PT
(bar)
PS4-W1-0.2/1.4 bar ATEX
808306
22.7
25
808308*
PS4-W1 0.6/1.8 bar ATEX
808301
22.7
25
808303*
PS4-W5 0.6/1.8 bar ATEX
808312
22.7
25
808311*
PS4-W1 18/24 bar ATEX
808305
37
41
808304*
PS4-W1 20/26 bar ATEX
808300
37
41
808302*
PS4-W5 20/26 bar ATEX
808310
37
41
808309*
*) Singlepack
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