Emerson EX series Betriebsanleitung

Electrical Control Valves
EX4 / EX5 / EX6 / EX7 / EX8
General information and technical data:
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
!
Safety instructions:
• Read installation instructions thoroughly. Failure to comply can result in
device failure, system damage or personal injury.
• It is intended for use by persons having the appropriate knowledge and
skill. Before attempting to install the valve make sure pressure in system is
brought to and remains at atmospheric pressure.
• Do not release any refrigerant into the atmosphere!
• Do not use any other fluid media without prior approval of ALCO
Controls. Use of fluid 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 97/23/EC.
• Do not operate valve connected directly to supply voltage. Use applicable
stepper motor driver.
• Switch off all voltages / currents before cabling.
• Do not operate system before all cable connections are completed.
• Do not operate the valve when the compressor is not running.
• Do not operate the valve when system is under vaccum except for closure
of valve before refrigerant charging.
• Comply with local electrical regulations when wiring.
Mounting location:
• Expansion valve and liquid injection application:
- The valve must be installed in horizontal position to vertical position (Fig. 1)
- For best result, locate the valve as close as possible to the distributor or inlet
of evaporator
• Hot gas bypass applications:
- Electrical connection must be downward (as per Fig 1).
- Install the valves as far as possible from compressor discharge.
- It is also recommended to install a check valve (2) on main hot gas pipe
going to condenser after branch line into the valve (1) (see Fig. 2).
• Suction line application: - Electrical connection must be downward
Technical Data
Type
Maximum working pressure
Operating temperature at motor
Connection, DN
Fluid group
Refrigerant: CFC, HCFC, HFC
Hazard category: PED 97/23/EC
Nominal Supply Voltage U:
Maximum Current Imax.:
Marking
Marking
Document Nr.: EX48_65130__R04
Operating Instructions
EX4
Uni-flow versions: –50°C ... +100°C, Bi-flow versions: -40°C ... +80°C
√ √ √ √
-
24 VDC
0.5 A
not applicable
√ √ √ √
Replacement for: R03
Emerson Climate Technologies GmbH
GB Holzhauser Str. 180 - D-13509
Berlin, Germany
www.emersonclimate.eu
Installation:
• For uni-flow valves the arrow must point in the direction of refrigerant flow.
• Apply brazing for copper to stainless steel with minimum 30% silver brazing
rod and required flux (see Fig. 5).
− When brazing, direct flame away from valve. Use wet rags or other suitable
heat protection.
• Protect the valve against vibration. If the total valve weight results in excessive
stress to the piping joints, the valve must be supported by suitable mounting
bracket(s).
• The valve must be protected against contaminants. Install an ALCO filter drier
before the valve.
• 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 ALCO sight glass AMI or MIA before the valve.
• Warning! : 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.
Leakage test:
After completion of installation, a test pressure must be carried out as follows:
− According to EN378 for systems which must comply with European pressure
equipment directive 97/23/EC
− To maximum working pressure of system for other applications
Remarks:
1) Failure to do so could result in loss of refrigerant and person injury.
2) The pressure test must be conducted by skilled persons with due respect
regarding the danger related to pressure.
Wiring and mounting of plug:
(Fig. 3 A = White, B = Black, C = Blue, D: Brown): 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 tighten.
Wiring to driver/controller:
See wiring diagram of assosiated driver or controller.
Warning: Improper wiring will result wrong direction of rotation or no rotation
of stepper motor. See installation instruction of electronic board.
Operation:
See operation manual of associated electronic driver/controller.
Warning:
All valves are delivered at half open. Do not charge system before closure of
valve. See operating instruction of associated driver/controller.
Service hints:
• Do not apply motor voltage/current out of specified range.
• For motor check, use an ohmmeter with suitable range as shown in Fig. 3.
• EX4/EX5/EX6/EX7/EX8 has capability of positive shut-off when it is driven to
fully close position.
EX5 EX6
PS: 60 bar
see Fig. 4
II
√ √ √ √ √ √ √ √
- -
24 VDC 24 VDC
0.5 A 0.5 A
not applicable not applicable
√ √ √ √ √ √ √ √
EX7 EX8
PS: 45 bar
√ √ √ √ √ √ √ √
I I
24 VDC 24 VDC
0.75 A 0.8 A
√ √ √ √ √ √ √ √
√ √ √ √ √ √ √ √
Date: 07.12.2012 PCN 865 288