Emerson EXM Serie Instrucciones De Funcionamiento

G e n e r a l i n f o r m a t i o n :
EXM/L are unipolar stepper motor driven electronic
expansion valves for precise control of refrigerant mass flow
in refrigeration systems.
The valve consists of two individual part:
-
Valve body & Coil
WARNING:
• The device has a potential ignition source and has not
been qualified according to ATEX standards. Installation
only in "non-explosive location".
• Do not approach strong magnetic object to the valve
casing.
• Do not use the valve in case the valve suffers a hard
impact.
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.
• 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.
• Ensure that the system is correctly labelled with applied
refrigerant type and a warning for explosion risk.
• 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, temperature, voltage and current.
• Ensure that the system piping is grounded.
• Do not connect valve directly to supply voltage. Use a
suitable stepper motor driver.
• Before installation or service disconnect all voltages
from system and device.
• Observe and avoid mechanical damage of component
housing.
• 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.
• Do not operate system before all cable connections are
completed.
• For flammable refrigerants only use valves and
accessories approved for it!
M o u n t i n g l o c a t i o n : ( F i g . 1 / 3 / 5 )
• Choice of mounting location: If the coil is exposed to
moisture/water (regardless of temperature), the metal
parts of coil may begin to rust over time.
• The valve must be installed with head upside or within
± 90° from upside as per Fig. 1a.
• Recommendation for use in refrigeration applications
(self-contained display cabinet/unit): Valve to be installed
vertical with coil upside or between vertical and maximum
angle of 60° from vertical if the valve is located in cold/wet
compartment. (Fig. 1b)
• For best results locate the valve as close as possible to
the distributor or inlet of evaporator.
• Allow 50 mm space above the valve to mount the coil as
shown in Fig. 3/ 5.
: The valve must be installed in an appropriate
housing to protect them from mechanical damage or shock.
Emerson Climate Technologies GmbH
Pascalstrasse 65 I 52076 Aachen I Germany
O P E R A T I N G I N ST RU C T I O N S
Electronic Expansion Valves EXM / EXL
I n s t a l l a t i o n :
• The valve has Bi-flow performance capability.
• Protect the orifice of valve against entering particle by
means of installing filter or filter drier at the inlet of valve
or on liquid line.
• Install a sight glass (AMI or MIA) before the valve.
• Make sure that the valve is fully open during brazing/
pressure test / leakage Test.
B r a z i n g : ( F i g . 2 )
• Remove the coil by pulling it from valve prior to brazing.
• Perform 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.
• 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 120 °C!
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.
E l e c t r i c a l c o n n e c t i o n :
• Entire electrical connections have to comply with
local regulations.
• Improper wiring will result wrong direction of rotation
or no rotation of stepper motor.
• 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 neighbouring parts.
• The connecting part of the lead wire must be securely
fixed so as not to be disconnected by vibration.
Wiring and mounting of coil: (see Fig. 3/6)
• Prewired coil with cable length of approximately 1 meter
is ready for connection to the electronic board.
• Push coil on the valve until it rests completely on valve
head and the clamp is fixed on inlet pipe (A)
Wiring to driver/controller: (Fig. 4)
• See the wiring diagram of applied driver/controller.
E X M / E X L - 1 2 5
White
Winding 1/2
Orange
Yellow
E X M / E X L - 2 4 U
White
Winding 1/2
Red
(common)
Orange
Yellow
Fig. 4
www.climate.emerson.com/en-gb
O p e r a t i o n :
• Check the valve opening prior to vacuuming or
performing a pressure test. Do not charge the system
before the valve is fully closed.
• Check for leaks, sufficient refrigerant charge and be sure
no flash gas is present before attempting to check valve
operation.
• See
driver/controller.
• If the power to the valve is interrupted, the valve will keep
as the position it was before power off.
S e r v i c e / M a i n t e n a n c e :
• Before shutting the power off, bring the valve to fully close
position.
• Defective EXM/ EXL must be replaced, they cannot be
repaired.
• 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.
• According
maintenance, tightness tests shall be carried out at the
relevant part of the refrigerating system. This shall apply
where appropriate following any repair.
• For motor check, use an ohmmeter with suitable range.
• Internal resistance between each winding is 46 Ω for
EXM/EXL-125 and 185 Ω for EXM/EXL-24U (see Fig. 4).
T e c h n i c a l D a t a :
Max. allowable
pressure PS
Temperature range TS
Nominal Supply
Voltage U
Resistance per phased
Protection class
Connection (DN)
Fluid group (PED)
Released Refrigerants
NOTE: *) according to PED 2014/68/EU.
Marking
Dimensions
Blue Brown
Winding 3/4 (common)
Blue
Winding 3/4
OI_EXML_A1_A2L_A3_EN_DE_FR_ES_IT_Rev08_865021.docx
operating instructions of
to EN 378-4 during
45 bar
Storage / Transport /
Ambient -30...+60 °C
Medium -30...+70 °C
EXM/L-125 12 VDC ±10 %
EXM/L-24U 24 VDC ±10 %
EXM/L-125 46 Ω ±10 %
EXM/L-24U 185 Ω ±10 %
IP65 excluded JST (IP30) terminal
(see Fig. 6)
EXM 1/4" ODM
EML 1/4" ODF / 8 mm ODM
I + II
Fluid Group II* R134a, R410A, R407C
Fluid Group I* R32, R454B, R452B
Fluid Group I* R290
not required
See Fig. 5
EN
used electronic
each periodic
Date: 12.05.2023