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s
Use
CE2N4717en
10.11.2011
ACVATIX™
Modulating refrigerant
valves, PS53
for ammonia (R717) and safety refrigerants
One valve type for expansion, hot-gas and suction throttle applications
Hermetically sealed
Selectable standard interface DC 0/2...10 V or DC 0/4...20 mA
High resolution and control accuracy
Precise positioning control and position feedback signal
Short positioning time (< 1 second)
Closed when deenergized
Robust and maintenance-free
DN 25 with k
values from 0.10 to 6.3 m³/h
vs
The MVS661..N refrigerant valve is designed for modulating control of refrigerant cir-
cuits including chillers and heat pumps. It is suitable for use in expansion, hot-gas and
suction throttle applications. In addition to ammonia (R717), the valve can handle all
standard safety refrigerants, noncorrosive gases / liquids and CO
suited for use with inflammable refrigerants.
4
MVS661..N
(R744). It is not
2
Building Technologies
717
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Related Manuals for Siemens ACVATIX PS53
Summary of Contents for Siemens ACVATIX PS53
- Page 1 ACVATIX™ MVS661..N Modulating refrigerant valves, PS53 for ammonia (R717) and safety refrigerants One valve type for expansion, hot-gas and suction throttle applications Hermetically sealed Selectable standard interface DC 0/2...10 V or DC 0/4...20 mA High resolution and control accuracy ...
- Page 2 ASR…N will restore the valve’s characteristics to its original specifications. The valve insert is supplied complete with Mounting Instructions (74 319 0486 0). 2 / 16 Siemens Modulating refrigerant valves, PS53 CE2N4717en Building Technologies 10.11.2011...
- Page 3 LED for indicating the operating state Control The MVS661..N refrigerant valve can be driven by Siemens or third-party controllers that deliver a DC 0/2...10 V or DC 0/4...20 mA output signal. For optimum control performance, we recommend a 4-wire connection between con- troller and valve.
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Page 4: Signal Priority
MVS661..N refrigerant valves are supplied fully calibrated. Execute a calibration after replacing the electronics, when the red LED is on or When is a calibration when the valve is leaking (at seat). required? 4 / 16 Siemens Modulating refrigerant valves, PS53 CE2N4717en Building Technologies 10.11.2011... -
Page 5: Connection Type
For straightforward valve sizing, refer to the tables for the relevant application (from page 9). For accurate valve sizing, we recommend to make use of the valve sizing software "Refrigeration VASP", available from your local Siemens office. Notes The refrigeration capacity Q is calculated by multiplying the mass flow by the specific enthalpy differential found in the h, log p-chart for the relevant refrigerant. -
Page 6: Mounting Notes
The flame should be directed away from the valve. During soldering, cool the valve with a wet cloth, for example, to ensure that it does not become too hot. 6 / 16 Siemens Modulating refrigerant valves, PS53 CE2N4717en Building Technologies 10.11.2011... -
Page 7: Warranty
Current local legislation must be observed. Warranty Application-specific technical data must be observed. If specified limits are not observed, Siemens Building Technologies / CPS Prod- ucts will nor assume any responsibility. Technical data Functional actuator data... - Page 8 At 45 °C < Tamb < 55 °C and 80 °C < Tmed < 120 °C the valve must be installed on its side to avoid shortening the service life of the valve electronics Transformer 160 VA (e.g. Siemens 4AM 3842-4TN00-0EA0) In case of strong vibrations, use high-flex stranded wires for safety reasons.
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Page 9: Operation
Piping must be connected to potential earth! Warning DIL switch Factory setting: Valve characteristics equal-percentage, positioning signal DC 0...10 V. Details see "Configuration DIL switches", page 3. Calibration See "Calibration", page 4. 9 / 16 Siemens Modulating refrigerant valves, PS53 CE2N4717en Building Technologies 10.11.2011... - Page 10 50 % of the k value of the selected valve For accurate valve sizing, the valve selection program "Refrigeration VASP" is rec- ommended 10 / 16 Siemens Modulating refrigerant valves, PS53 CE2N4717en Building Technologies 10.11.2011...
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Page 11: Application Example
/h / 0.4 m /h x 100 % = 115 % (> 50 %) Capacity control a) Refrigerant valve MVS661..N for capacity control of a dry expansion evaporator. 11 / 16 Siemens Modulating refrigerant valves, PS53 CE2N4717en Building Technologies 10.11.2011... - Page 12 To ensure that the selected valve will not be too small for low loads, sizing should take account of both possibilities. Correction table KE R717 Expansion valve R744 R134a R402A R401A R407A R404A R407C R407B 12 / 16 Siemens Modulating refrigerant valves, PS53 CE2N4717en Building Technologies 10.11.2011...
- Page 13 Suitable for large refrigeration systems on air conditioning applications with several compressors or compressor stages, and where the evaporator and compressor are some distance apart (attention must be paid to the oil return). 13 / 16 Siemens Modulating refrigerant valves, PS53 CE2N4717en Building Technologies 10.11.2011...
- Page 14 With superheat = 6 K With subcooling = 2 K ∆p upstream of evaporator = 1.6 bar ∆p condenser = 0.3 bar ∆p evaporator = 0.3 bar 14 / 16 Siemens Modulating refrigerant valves, PS53 CE2N4717en Building Technologies 10.11.2011...
- Page 15 Typical control range 10...100 %. The capacity controller ensures that the com- pressor is adequately cooled, making it unnec- essary to set a minimum stroke in the refriger- ant valve. – 15 / 16 Siemens Modulating refrigerant valves, PS53 CE2N4717en Building Technologies 10.11.2011...
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Page 16: Revision Numbers
∆p condenser = 0.3 bar ∆p evaporator = 0.3 bar Revision numbers Product number Valid from rev. no. MVS661.25-016N MVS661.25-0.4N MVS661.25-1.0N MVS661.25-2.5N MVS661.25-6.3N 16 / 16 2011 Siemens Switzerland Ltd Subject to change Siemens Modulating refrigerant valves, PS53 CE2N4717en Building Technologies 10.11.2011...