User Manual

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Siemens Modulating refrigerant valves, PN 63 A6V11160433en / A5W00038735

Building Technologies 2018-07-17

Sizing

For accurate valve sizing, we recommend using the "Refrigeration VASP" software

sizing tool, available from your local Siemens office.

Engineering notes

Additional installation notes may also need be observed as well as the use of proper

safety elements (e.g. pressure switches, motor protection) depending on the particular

application.

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

must be fully open during the pressure test and during venting (power supply connect-

ed and positioning signal at maximum or forced opening by G ↑ ZC).

To prevent the formation of flash gas on expansion applications, the velocity of the

refrigerant in the fluid pipe must not exceed 1 m/s. To assure this, the diameter of the

fluid pipe must under certain circumstances be greater than the nominal size of the

valve.

1 = evaporator

2 = compressor

3 = condenser

4 = expansion valves

a) The differential pressure over reduction must be less than half the differential pres-

sure Δp

b) The inlet path between diameter reduction and expansion valve inlet

ƒ Must straight for at least 600 mm

ƒ May not contain any valves

A filter / dryer must be mounted upstream of the expansion valve.

Warning

Expansion application

Engineering notes