OPERATING INSTRUCTIONS
Electronic Expansion Valve CX2
for CO
2
subcritical application
Emerson Climate Technologies GmbH
Pascalstrasse 65 I 52076 Aachen I Germany
Date: 13.05.2022
OI_CX2_A1_EN_DE_FR_ES_IT_RU_Rev05_865913.docx
EN
G e n e r a l i n f o r m a t i o n :
CX2 electronic expansion valve is designed based on Pulse
width modulation concept.
S a f e t y i n s t r u c t i o n s :
•
Read operating instructions thoroughly. Failure to
comply can result in device failure, system damage or
personal injury.
•
This product is intended for use by qualified personnel
having the appropriate knowledge and skills like trained
according to EN 13313 or a specific training for
flammable refrigerants.
•
In a severely contaminated system, avoid breathing acid
vapours and avoid contact with skin from contaminated
refrigerant / lubricants. Failure to do so could result in
injury.
•
Before opening any system make sure pressure in
system is brought to and remains at atmospheric
pressure.
•
Do not release any refrigerant into the atmosphere!
•
Do not exceed the specified maximum ratings for
pressure and temperature.
•
Ensure that the system piping is grounded.
•
Do not operate the valve at atmospheric pressure.
•
Before installation or service disconnect all voltages
from system and device.
•
Do not use any other fluid media without prior approval
of EMERSON. Use of fluids not listed could result in:
-
Change of hazard category of product and
consequently change of conformity assessment
requirement for product in accordance with European
Pressure Equipment Directive 2014/68/EU.
•
Ensure that design, installation and operation comply
with European and national standards/regulations.
M o u n t i n g l o c a t i o n :
• The CX2 should be installed in a position, which allows
the enclosing tube to be above the horizontal axis
(preferred: vertical position ± 45°). If the enclosing tube
is lower than the body of the valve, particle may
accumulate causing inconsistent operation.
Fig. 1
• For best results locate the valve as close as possible to
the distributor or inlet of evaporator.
• Allow sufficient clearance above the valve for removal of
Coil.
• A filter drier mounted upstream of the valve is
recommended to protect the valve against contaminates.
I n s t a l l a t i o n :
• Do not remove seal caps until ready for installation in
order to minimize entering of moisture and dirt.
• The seal caps should be removed with care to avoid
damaging the extension tube connections.
•
WARNING: Avoid damaging the connections!
• Direction of flow must match with arrow on valve body.
• Installation of an optional orifice to the valve outlet before
Brazing. (flat screw driver).
Fig. 2
• After Brazing open the valve to allow evacuation of
system prior to charging with refrigerant.
B r a z i n g :
• Perform the brazing joint as per EN 14324.
• Before and after brazing clean tubing and brazing joints.
• To avoid oxidization, it is advised to purge the system
with an inert gas such as nitrogen while brazing.
•
Do not exceed the
max. surface
temperature of
100 °C!
Fig. 3
• To avoid overheating it is advised to make the joint at one
end cool the device completely before repeating the
procedure on the other end connection.
• Remove the coil from valve prior to brazing.
I n s t a l l a t i o n C o i l :
• For coil mounting please refer to corresponding coil
operating instruction.
P r e s s u r e T e s t :
After completion of installation, a pressure test must be
carried out as follows:
-
according to EN 378 for systems which must comply with
European pressure equipment directive 2014/68/EU.
-
to maximum working pressure of system for other
applications.
T i g h t n e s s T e s t :
Conduct a tightness test according to EN 378-2 with
appropriate equipment and method to identify leakages
from joints and products. The allowable leakage rate must
be according system manufacturer’s specification.
WARNING:
•
Failure to pressure test or tightness test as
described could result in loss of refrigerant, damage
to property and/or personal injury.
•
The tests must be conducted by skilled personnel
with due respect regarding the danger related to
pressure.
O p e r a t i o n :
•
NOTE:
CX2 is mainly designed for use in liquid line.
Prevent to operate the valve under vacuum condition or
lack of liquid refrigerant in system.
• In close position CX2 has capability of positive shut-off
(as long as inlet pressure is 0.5 bar above outlet
pressure).
• Perform a functional test of electrical circuit before
charging the system with refrigerant.
• Check for leaks, sufficient refrigerant charge and be sure
no flash gas is present before attempting to check valve
operation.
S e r v i c e / M a i n t e n a n c e :
• Defective CX2 must be replaced, they cannot be
repaired.
• According to EN 378-4 during each periodic
maintenance, tightness tests shall be carried out at the
relevant part of the refrigerating system. This shall apply
where appropriate following any repair.
T e c h n i c a l D a t a :
Max. allowable pressure PS 90 bar
Test pressure PT
129 bar
Medium temperature
-40…+65 °C
Max. ambient temperature
ESC-M24VAC
ESC-W24VAC/W230VAC
+60 °C
+45 °C
Connection sizes
3/8” x 1/2”
(10 x 12 mm) ODF
Solenoid Coil
ESC-M24VAC
ESC-W24VAC
ESC-W230VAC
50 (60) Hz
Supply voltage /
Ambient temperature
MOPD
ESC-W24VAC
ESC-W230VAC
Nominal / 25°C
40 bar
-10% / 25°C
40 bar
Nominal / 45°C
40 bar
-10% / 45°C
40 bar
ESC-M24VAC
Nominal / 25°C
40 bar
-10% / 25°C
40 bar
Nominal / 60°C
35 bar
-10% / 60°C
30 bar
NOTE:
MOPD values are valid only for 50 Hz supply
voltage operation. The MOPD decrease with increasing
ambient temperature.
Medium compatibility
Fluid Group II
R744
Oils: Mineral, Alkyl
benzene and ester
lubricants
Marking
