Emerson EX4 series Betriebsanleitung

G e n e r a l i n f o r m a t i o n :
EX4/5/6/7/8 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
- Liquid injection for subcooling and desuperheating
- Capacity control: hot gas bypass regulator
- Capacity control: suction pressure regulator
- Head pressure regulator
- Liquid level regulator
- Crankcase pressure regulator
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 it is intended for use by
persons 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 exceed the specified maximum ratings for
pressure, temperature, and voltage.
•
Do not operate system before all cable connections
are completed.
• Do not operate valve connected directly to supply
voltage. Use suitable stepper motor driver.
•
Do not operate the valve when the compressor is not
running.
•
Do not operate the valve when system is under
vacuum except for closure of valve before
refrigerant charging.
•
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 fluid not listed could
result in a change of hazard category of product and
consequently change of conformity assessment
requirement for product in accordance with
European pressure equipment directive 97/23/EC.
•
Ensure that design, installation and operation are
according to European
standards/regulations.
T e c h n i c a l D a t a :
Type
Maximum working pressure PS
Factory pressure Test PT
Operating temperature at inlet
at outlet
Connection, DN
Fluid group
Refrigerant: CFC, HCFC, HFC, CO
2
HFO blends
Hazard category: PED 97/23/EC
Nominal Supply Voltage U
Maximum Current Imax
Winding resistance per phase /
isolation resistance
Marking
Emerson Climate Technologies GmbH
Am Borsigturm 31 I 13507 Berlin I Germany
Electrical Control Valves
EX4 / EX5 / EX6 / EX7 / EX8
M o u n t i n g l o c a t i o n : ( F i g . 1 , 2 , 3 )
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 an
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.
Flash tank CO

- Fig. 3:
bypass,
- The motor needs to be pointed downward.
- The valve
contaminants by an upstream filter or strainer
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 . 5 )
•
Perform and consider the brazing joint as per
EN 14324.
• Before and after brazing clean tubing and brazing
joints.
and national
• Minimize vibrations in the piping lines by appropriate
solutions.
• Do not exceed the max. body temperature of 120°C!
• Use flux and silver rod having a minimum of 30%
silver.
EX4
Uni-flow: –50°C*... +100°C, Bi-flow: -50°C ... +80°C
, HFO,

-
24 VDC
0.5 A
13 Ω ± 10% /
> 20 MΩ
,
www.emersonclimate.eu
Operating instruction

) (Fig. 2).
Bypass application:
2
 
: high pressure gas, : liquid,

: max. 60 / 56 bar

must be protected
EX5
60 bar
66 bar
-100°C*...+100°C

-
24 VDC
0.5 A
13 Ω ± 10% /
> 20 MΩ
,
Date: 22.02.2016
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
97/23/EC.
- to maximum working pressure of system for other
applications.
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.

) on
L e a ka g e T e s t :
Conduct a tightness test according to EN 378 with
appropriate equipment and method to identify leakages of
external joints.
E l e c t r i c a l C o n n e c t i o n :
: cold gas
Warning:
• Entire electrical connections have to comply with
against
local regulations.

.
•
Improper wiring will result wrong direction of
rotation or no rotation of stepper motor.
•
Prewired plug and cable assembly (EXV-Mxx) is ready
for connection to the valve.
• There is no specific requirement for positioning of plug
on pins (see Fig. 6): Push the plug on pins on top of the
valve. Rotate the nut one turn in clockwise direction
and push the plug. Repeat this procedure until the plug
is tightened.
Wiring / Mounting to driver/Controller:
See the wiring diagram of applied driver/controller.
O p e r a t i o n :
See operating instructions
driver/controller.
S e r v i c e / M a i n t e n a n c e :
• Defective EX valves must be replaced, they cannot be
repaired.
•
For motor check:
-
Remove cable plug from valve.
- Use an ohmmeter with suitable range.
- Measure windings resistance per phase at opposite
placed pins acc. Fig. 7 and data as in the table below.
•
EX4/5/6/7/8 has capability of positive shut-off when it
is driven to fully close position (as long as outlet
pressure is less than inlet pressure).
EX6 EX7
see Fig. 4
II
 
- I
24 VDC 24 VDC
0.5 A 0.75 A
13 Ω ± 10% / 8 Ω ± 10% /
> 20 MΩ > 20 MΩ
, ,
EX4-8_OI_ML_R07_865288.docx
pressure equipment directive
of applied electronic
EX8
56 bar
UL Approval: 45 bar
61.6 bar
*) UL Approval based on ≥ - 40°C

I
24 VDC
0.8 A
6 Ω ± 10% /
> 20 MΩ
, , ,