Data Sheet for Product

6/20
Siemens Modulating refrigerant valves with magnetic actuator, PS45 CE2N4714en
Smart Infrastructure 2021-08-02
Engineering notes
Depending on the application, additional installation instructions may need to be
observed and appropriate safety devices (e.g. pressostats, full motor protection, etc.)
fitted.
To prevent damage to the seal inside the valve insert, the plant must be vented on the
low-pressure side following a pressure test (valve port AB), or the valve must be fully
open during the pressure test and during venting (power supply connected and
positioning signal at maximum or forced opening by G → ZC).
To prevent formation of flash gas on expansion applications, the velocity of the
refrigerant in the fluid pipe may not exceed 1 m/s. To assure this, the diameter of the
fluid pipe must be greater than the nominal size of the valve, using reducing pieces for
making the connections to the valve.
1 = Evaporator
2 = Compressor
3 = Condenser
4 = Expansion valves
a) The differential pressure over reduction must be less than half the differential
pressure Δp
FL
.
b) The inlet path between diameter reduction and expansion valve inlet
 Must straight for at least 600 mm
 May not contain any valves
A filter / dryer must be mounted upstream of the expansion valve.
The valve is not explosion-proof.
It is not approved for use with ammonia (NH3, R717).
Warning
Expansion application
Engineering notes