Product Overview

The hot-gas diverting valve may be used for modulating recovery of the heat from
the condenser, even in the event of high differential pressures.
Heat recovery
Recomme
nded differential pressure Δp
v100 across the fully opened valve
(control path AB → A) 0.5 < Δp
v100
< 1 bar.
4721Z07
+
–
+
A
B
AB
Example:
Refrigeration capacity Q
0
Refrigerant
Condensation temperature t
c
Evaporation temperature t
0
Liquid temperature t
fl
Selected valve
Actual pressure drop Δp
v100
67 kW
R134a
50 °C
2 °C
45 °C
M3FB32LX
0.7 bar
Mounting notes
Mounting instructions are enclosed with the valve:
•
Nr. 35548 (refrigerant valve)
• Nr. 35541 (ZM.. terminal housing)

4721Z01
4721Z02
• The refrigerant valves can be mounted in any orientation,
but upright mounting is preferable.
• Arrange the pipework in such a way that the valve is not
located at a low point in the plant where oil can collect.
• The pipes should be fitted in such a way that the alignment
does not distort the valve connections. Fix the valve body
so that that it cannot vibrate. Vibration can lead to burst
connection pipes.
• Before soldering the pipes, ensure that the direction of flow
through the valve is correct.
• The pipes must be soldered with care. To avoid dirt and the
formation of scale (oxide), inert gas is recommended for
soldering.
• The flame should be large enough to ensure that the
junction heats up quickly and the valve does not get too hot.
• 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.
• Port B must be sealed off when a 2-port valve (control path
AB → A) is used.
• The valve body and the connected pipework should be
lagged.
• The actuator must not be lagged.
Always switch off the power supply before connecting or disconnecting the ZM..
terminal housing.
Caution
Installation note
s
The hot-gas control valves are maintenance-free.
The low friction and robust design make regular maintenance unnecessary and
ensure a long product life.
The valve cannot be repaired. It has to be replaced as a complete unit.
Repai
r
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Siemens Modulating refrigerant valves with magnetic actuator‚ PS43 CE2N4721en
Building Technologies 03.05..2011