Operating Instructions
Pressure Transmitter
PT5 Versions released for R290
General Information:
Pressure Transmitters convert a pressure into a linear
electrical output signal.
PT5...FLR meets explosion protection requirements
for electrical equipment, equipment group II,
equipment categories 3G, in ignition protection class
“nC” as hermetically sealed device in explosion group
IIB and temperature class T4. They are marked with:
II 3G Ex nC IIB T4 Gc X
PT5…FLR must be installed in an appropriate
housing to protect them from mechanical damage,
shock and light.
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.
•
R290 requires 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.
•
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 all
voltages 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 to European and national
standards/regulations.
Installation (Fig. 1):
•
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.
•
Use of flux and silver rod having a minimum of
30% silver.
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 97/23/EC.
•
Max. system test pressure: 38.5 bar.
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 EN378-2 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.
Wiring:
•
PT5…FLR are in compliance with European EMC
directive and bear CE-marking.
•
Connection cables should not be extended beyond
standard 6m length, otherwise entire system needs
to be verified from the system manufacturer for free
system signal emissions and immunity for
conformity to EMC directive and standards.
•
Signal line should not be installed parallel with
power lines to avoid electrical interference.
•
Ensure polarity for connection of 2-wire cable to
controller:
•
+24V DC to be connected to brown wire
•
Output Signal / 0V to be connected to green wire
Operation:
•
Perform a functional test of electrical circuit
before charging the system with refrigerant.
Service / Maintenance:
•
Defective PT5…FLR must be replaced; they
cannot be repaired.
•
Disconnect electrical power before service.
•
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 PT5…FLR:
•
Max. allowable working pressure PS:
35 bar
•
Test pressure PT:
38.5 bar
•
Supply voltage:
7V...30V DC, class 2
•
Output signal:
4 mA…20 mA
•
Protection class (EN 60529):
IP65
•
Medium temperature:
-40°C…+100°C
•
Ambient temperature:
-20°C…+80°C
•
Released/compatible for: R290; mineral-, alkyl
benzene and ester lubricants
•
Cable length (2 wire):
6.0 m
•
Marking:
-
CE-Mark according 2004/108/EC, EN61326
Emission (Group 1, Class B) and immunity
(industrial locations)
-
II 3G Ex nC IIB T4 Gc X
PT5 types, not listed in the following table, are not
released for use with flammable refrigerants!
Type Range
Part No.
PT5-30L-FLR 0…30 bar
802 389M
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Emerson Climate Technologies GmbH
Holzhauser Str. 180 I 13509 Berlin I Germany
Date: 01.10.2014
PT5-FLR_OI_R05_ML_865901.docx