User Manual
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Siemens Control device PN25, safety function to DIN EN 14597 CE1N4389en
Building Technologies 10.01.2011
Commissioning notes
The manual adjuster must remain secured with anti-tamper screws as factory
delivered.
When removing anti-tamper screws TÜV approval for the safety function to
DIN EN 14597 ceases.
Valve stem retracts: valve opens = increasing flow
Valve stem extends: valve closes = decreasing flow
When commissioning the system, check the wiring and functions, and set any aux-
iliary switches and potentiometers as necessary, or check the existing settings.
The actuator is driven to OPEN (valve open) until the red clamp, that fixes a stroke
position of ca. 50 % can be easily removed. Voltage must be applied to either ter-
minal 21 and Y1 to drive to OPEN, or voltage to G-G0 as well as Y > 70 %.
The safety function is only enabled after the red safety clamp is removed.
Cylinder with valve
stem connector
fully retracted
stroke = 0%
4564Z12
0
1
Cylinder with valve
stem connector
fully extended
stroke = 100 %
4564Z13
0
1
The control device can only be operated in auto-
matic mode. The crank (2) on the manual adjust-
ment knob (1) is engaged and secured with anti-
tamper screws.
When removing anti-tamper screws TÜV approval
for the safety function to DIN EN 14597 ceases.
1
2
4564Z14
Engaged crank
(2) on the
manual adjustment knob
(1)
Maintenance notes
The MK..5..G control devices are maintenance-free
When servicing the control device:
• Never disassemble valve and actuator for maintenance or servicing else
TÜV approval for the safety function to DIN EN 14597 ceases.
• Switch off pump of the hydronic loop
• Interrupt the power supply to the actuator
• Close the main shutoff valves in the system
• Release pressure in the pipes and allow them to cool down completely
• If necessary, disconnect electrical connections from the terminals
Recommendation MKB562..G: Trigger stroke calibration after servicing or mainte-
nance.
The control device has to be replaced as a whole unit else TÜV approval for the
safety function to DIN EN 14597 ceases.
MKB..
Automatic operation
Repair