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Siemens Modulating refrigerant valves, PS53 CE2N4717en
Building Technologies 10.11.2011
LED Indication Function Remarks, troubleshooting
Green Lit
Control mode Automatic operation; everything o.k.
Flashing
Calibration in pro-
gress
Wait until calibration is finished
(green or red LED will be lit)
Red Lit
Calibration error
Internal error
Recalibrate (operate button in opening 1x)
Replace electronics module
Flashing
Mains fault Check mains network (outside the frequency or
voltage range)
Both Dark
No power supply
Electronics faulty
Check mains network, check wiring
Replace electronics module
The 4-wire connection should always be given preference!
SNA PMED IFWire cross-section [mm2]
1.5 2.5 4.0 2)
Product number [VA] [W] [A] max. cable length L [m]
MVS661..N 22 12 1.6…4 A 65 110 160
MVS661..N 22 12 1.6…4 A 20 35 50
SNA = nominal apparent power for selecting the transformer
PMED = typical power consumption
IF= required slow fuse
L = max. cable length; with 4-wire connections, the max. permissible length of the separate 1.5 mm2
copper positioning signal wire is 200 m
1) All information at AC 24 V
2) With 4 mm2electrical wiring reduce wiring cross-section for connection inside valve to 2.5 mm2.
Sizing
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.
The refrigeration capacity Q0is calculated by multiplying the mass flow by the specific
enthalpy differential found in the h, log p-chart for the relevant refrigerant. To help de-
termine the refrigeration capacity more easily, a selection chart is provided for each
application (from page 10). With direct or indirect hot-gas bypass applications, the en-
thalpy differential of Qc(the condenser capacity) must also be taken into account when
calculating the refrigeration capacity.
If the evaporating and/or condensing temperatures are between the values shown in
the tables, the refrigeration capacity can be determined with reasonable accuracy by
linear interpolation (refer to the application examples from page 11).
At the operating conditions given in the tables, the permissible differential pressure
pmax (25 bar) across the valve is within the admissible range for these valves.
If the evaporating temperature is raised by 1 K, the refrigeration capacity increases by
about 3 %. If, by contrast, subcooling is increased by 1 K, the refrigeration capacity
increases by about 1 to 2 % (this applies only to subcooling down to approximately
8 K).
Engineering notes
Depending on the application, it may be necessary to observe additional Installation
Instructions and fit appropriate safety devices (e.g. pressurestats, full motor protection,
etc.).
In order not to damage the seal inside the valve insert, the plant must be vented on the
low-pressure side after the pressure test has been made (valve port AB), or the valve
Indication of operating
state
Connection type 1)
4-wire connection
3-wire connection
Notes
Warning
