Emerson EX4 Instrucciones De Funcionamiento

G e n e r a l i n f o r m a t i o n :
EX4-8 are stepper motor driven valves for precise control
of refrigerant mass flow in refrigeration, air conditioning,
heat pumps, industrial cooling process and close control
systems as:
- expansion valves and liquid injection valves
- suction pressure regulator (evaporator or crankcase)
- hot gas bypass regulator
- hot gas flow such as heat reclaim application
- Condensing pressure regulator and liquid duty
The device has a potential ignition source and has not
been qualified according to ATEX standards. Installation
only in "non-explosive location".
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.
• 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.
• Do not operate the valve when system is under vacuum
except for closure of valve before refrigerant charging.
• Do not operate the valve when the compressor is not
running.
• 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.
• Do not operate system before all cable connections are
completed.
T e c h n i c a l D a t a :
Type
Maximum allowable pressure PS
Factory pressure Test PT
Hazard category: PED 2014/34/EU
PED Conformity Assessment
Fluid group (acc. PED)
Refrigerants
Operating temperature
Dimensions
Nominal Supply Voltage U
Maximum Current Imax
Winding resistance per phase /
Isolation resistance
Markings
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
Electrical Control Valves EX4-8
• 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 / 2 )
Expansion valve and liquid injection applications:
- The motor needs to be pointed between downward to
sideways. (Fig. 1)
- For best result, locate the valve as close as possible to
the distributor or inlet of evaporator.
- Check for sufficient refrigerant charge/subcooling and
make sure no flash gas is present at the inlet of valve
before attempting to check valve operation. Install a sight
glass as well as a filter drier before the valve.
Hot gas bypass applications:
- The motor needs to be pointed downward.
- Install the valves as far as possible from compressor
discharge.
- It is also recommended to install a check valve (
main hot gas pipe going to condenser after branch line
into the valve (
Suction line application:
- The motor needs to be pointed downward.
Oil free system:
- The motor needs to be pointed downward.
I n s t a l l a t i o n :
• Direction of refrigerant flow must match with arrow on the
label ((except bi-flow valves).
WARNING:
• All valves are delivered at half open. Do not charge
system before closure of valve. See operating
instruction of used driver/controller.
• The interior parts of valve must be protected against
moisture and water at any time. It is not permitted the
use of water, steam or any other solvent to the inside of
valve for cleaning purpose.
B r a z i n g : ( F i g . 3 )
• 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.
• Use flux and silver rod with minimum of 30 % silver.
• 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.
EX4
90 bar (uni-flow),
60 bar (bi-flow, UL Approval)
99 bar (uni-flow),
66 bar (bi-flow)
-
-
R744 (subcritical), R448A, R449A, R513A, R450A, R134a, R452A, R23,
R410A, R407C, R404A, R507, R124
R1234ze, R32, R452B, R454B, R454A, R454C, R1234yf, R455A
*
at inlet: Uni-flow: –50 ... +100°C, Bi-flow: -50
*
at outlet: -100 ...+100°C
www.climate.emerson.com/en-gb


) (Fig. 2).
EX5
60 bar 60 bar
66 bar 66 bar
-
-
I (listed A2L refrigerants) & II (listed A1 refrigerants)
*
...+80°C
see Fig. 4
24 VDC
0.5 A
14 Ω ± 10 % /
> 20 MΩ
,
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 :
WARNING:
• 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.
) on
• 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.
• Installation plug valves
• Prewired plug and cable assembly (EXV-M...) are not
in compliance with EN60335-1-40/89 and are ready for
connection to the valve.
• There is no specific requirement for positioning of plug
on pins. (see Fig. 5)
1. Push the plug on pins on top of the valve.
2. Rotate the nut one turn in clockwise direction and push
the plug.
3. Repeat this procedure until the plug is tightened.
• Ensure, that the plug (with cable) is correctly placed
and tighten.
W i r i n g :
• See the wiring diagram of applied driver/controller.
O p e r a t i o n :
• See operating instruction of used driver/controller.
S e r v i c e / M a i n t e n a n c e :
• Defective EX4-8 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 to EN 378-4
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 remove cable plug from valve and use
an ohmmeter with suitable range. Measure windings
resistance per phase at opposite placed pins acc. Fig. 6
and data as in the table below.
• EX4-8 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).
EX6 EX7
60 bar
86 bar
- II
- Module D1
NOTE:
UL Approval: only A1 refrigerants
*) UL Approval: ≥ - 40°C
0.75 A
10 Ω ± 10 % /
> 20 MΩ
OI_EX4-8_A1_A2L_EN_DE_FR_ES_IT_RU_Rev10_865288.docx
EN
during each periodic
EX8
45 bar
65 bar
II
Module D1
0.8 A
7.5 Ω ± 10 % /
> 20 MΩ
, 1017,
Date: 18.08.2022