User Manual
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Siemens 2-Port and 3-Port Zone Valves, PN 16 / 20 CE1N4867en
Building Technologies For Asia Pacific Use Only 02.10.2008
Engineering notes
The admissible temperatures (see «Technical data») must be observed.
The actuator may be operated only with alternating current AC 230 V.
For safety and protection reasons connect the
actuator with a suitable cable conduit, e.g.
Phase cut and pulse-duration-modulated signals are not suitable.
Recommended number of opening/closing operations: approx. 50 per day, with 200
heating or cooling days
The valves should preferably be installed in the return, where the seals are exposed to
lower temperatures. It is not allowed to put a shut off at the bypass port B.
A strainer should be fitted upstream of the valve. This increases reliability.
Valve construction Valve series Valve flow in control mode Valve stem
Inlet A Outlet AB Retracted Extended
2-port valves
4867Z02
A
AB
MVI421..
A
AB
Variable
Variable
A
AB
closes
A
AB
opens
The direction of flow MUST be as indicated by the arrow, from A AB.
Valve construction Valve series Valve flow in control mode Valve stem
AB A B Retracted Extended
3-port diverting valves
4867Z03
AB
A
B
MXI421..
A
AB
B
Inlet:
constant
Outlet:
variable
Outlet:
variable
AB A
closes
B
AB
opens
AB A
opens
B
AB
closes
The direction of flow MUST be as indicated by the arrow, from AB A
and AB B (diverting valves).
Mounting notes
Mounting instructions 74 319 0362 0 are enclosed with the packaging
85°
4863Z01
85°
The direction of flow as described under «Engineering notes» must be observed.
Assembly is made with the coupling nut; no adjustments are required.
The actuator must be fitted in position 1 (also refer to «Manual operation»):
Position the actuator and tighten the coupling nut manually
Do not use any tools such as wrenches
The actuator must not be lagged
4867Z22
Suitable conduit shall connect to the actuator when undergone the wiring work of
the product.
Electrical installation
Caution
Recommendation
Warning
Warning
Orientation
Mounting
Caution