Product Overview

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Siemens Building Technologies Two-port and three-port small valves PN16, ANSI Class 250 CM1N4845E
HVAC Products 11.2001
AB A
CB
01465
Type VMP45... and VMK45... valves
may be used only in mixing applications.
Mixing:
Flow from A and B → AB
Port AB = Constant total flow (outlet)
Port A = Variable flow A → AB (inlet A)
Port B = Variable flow B → AB through bypass (inlet B)
Stem retracted: Path A → AB open, bypass closed
Stem extended: Path A → AB closed, bypass B open
Mounting notes
4845Z08
Permissible Not permissible
In addition, the direction of flow as described under
«Engineering» must be observed.
The valves are delivered in multipacks; mounting instructions are enclosed with the
packaging.
Commissioning notes
The straight-through path A → AB can be opened electrically via the actuator, or
manually. With three-port valves, this throttles or closes bypass B. Manually, path
A
→ AB can only be opened to 70 % (bypass closes to 30 %). The valves with
k
vs
values 10, 16 and 25 can be fully opened whereas the bypass can be fully closed
The valves are automatically closed by a return spring.
Before performing any service work on the valve and/or actuator: switch OFF the pump
and power supply, close the main shut-off valve in the pipework, release pressure in
the pipes and allow them to cool down completely. If necessary, disconnect electrical
connections from terminals. The valve may be commissioned only with the manual
wheel pre-set or with a correctly mounted actuator.
Three-port valves
with T bypass (4 ports)
VMP45… / VMK45...
Orientation
Manual adjustment
Warning !