Emerson Alco Controls CX2 Instructions De Service

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.
Note: CX2 is released as expansion valve and during
operation of valve CO must be feed in liquid phase to
2
inlet of the valve.
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.
• According to EN 13313 this product is intended
for use by personnel having the appropriate
knowledge and skill.
• 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 operate the valve at atmospheric pressure.
• Ensure that the system piping is grounded.
• 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
accordance with European pressure equipment
directive 2014/68/EU.
• Ensure that design, installation and operation are
according to European
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
contaminates.
Emerson Climate Technologies GmbH
Am Borsigturm 31 I 13507 Berlin I Germany
Electronic Expansion Valve CX2 for CO
subcritical application
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.
• 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 and consider the brazing joint as per
EN 14324.
for product in
• 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
and national
brazing.
• 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.
• Do not exceed the
maximum body
temperature of
100°C!
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.
the valve against
www.climate.emerson.com/en-gb
Operating instructions
Fig. 3
2
Warning:
• Failure to do so could result in loss of refrigerant
and personal injury.
• The pressure test must be conducted by skilled
personnel with due respect regarding the danger
related to pressure.
L e a k a g e T e s t :
Conduct a tightness test according to EN 378-2 with
appropriate equipment and method to identify leakages
of external joints. The allowable leakage rate must be
according system manufacturer's specification.
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.
• CX2 has capability of positive shut-off when it is
driven to fully close position (as long as inlet pressure
is 0.5 bar above outlet pressure).
S e r v i c e / M a i n t e n a n c e :
Defective CX2 valves must be replaced, they cannot be
repaired.
T e c h n i c a l D a t a :
Maximum allowable
working pressure PS
Test pressure PT
Medium temperature
Connection sizes
Compatibility
Permissible coils
MOPD Supply voltage
65 bar Nominal voltage
60 bar -5%
50 bar -10%
45 bar -15%
Note: MOPD values are valid only for 50 Hz
supply voltage operation.
Markings
CX2_OI_EN_DE_FR_ES_IT_RU_0321_R02_865913.docx
90 bar
129 bar
-40... +65°C
3/8" x 1/2" (10 x 12
mm) ODF
R744
Oils: Mineral, Alkyl
benzene and ester
lubricants
ESC24/230VAC,
50(60) Hz (AC)
Date: 05.03.2021