NC normally closed, or NO normally open. What is the difference? How to exercise actuator in case it does not work? What for is the red knob(plug)?
Негізгі бет Underfloor heating actuators. Avoid mistakes. Tips and tricks!
NC normally closed, or NO normally open. What is the difference? How to exercise actuator in case it does not work? What for is the red knob(plug)?
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