Data Sheet for Product

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Siemens Modulating refrigerant valves, PN 63 CE2N4717en
Smart Infrastructure 2019-11-25
ASR70 extends the application range of valves for refrigerant temperatures at the valve
inlet below 0° C. Typical applications pump systems with ammonia or CO
2
refrigerant
machines.
Direct mounting on refrigerant valve, no adjustments.
See data sheet A6V11858863.
The PTC conductive heating element is supplied complete with Mounting Instructions
A6V11858868.
Ordering
Valve body and magnetic actuator form one integral unit and cannot be separated.
Should the valve’s electronics become faulty, the entire electronics housing is to be
replaced by spare part ASR61, which is supplied complete with Mounting Instructions
(74 319 0270 0).
See table on page 20.
Technical design / functions
· 4 selectable standard signals for setpoint and measured value
· DIL switch to reduce the k
vs
value to 63 % of the nominal value
· Potentiometer for adjustment of minimum stroke for suction throttle applications
· Automatic stroke calibration
· Forced control input for "Valve closed" or "Valve fully open”
· LED for indicating the operating state
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. When operating on DC voltage, a 4-wire connection is mandatory!
The valve stroke is proportional to the control signal.
If the positioning signal is interrupted, or in the event of a power failure, the valve’s
return spring will automatically close control path 1 à 3.
4716Z15
2
on
1 2 3 4
G0 G Y UM ZC
1
3
4 5
1 Connection terminals
2 LED for indication of operating state
3 Minimal stroke setting potentiometer Rv
4 Autocalibration
5 DIL switches for mode control
PTC conductive heating
element
ASR
70
Example:
Product number Stock number Designation Quantity
MVS661.25-0.4N MVS661.25-0.4N Refrigerant valve 1
Spare parts
Replacement electron-
ics ASR61
Rev. no.
Features and benefits
Control
Sp
ring return function
Operator controls and
indicators in the
ele
c
tronics housing