Product Description
Power Supply:
- 24V +/- 10%
Consumption:
- 5 VA (working)
- 13 VA (fuse dimensioning)
Frequency:
- 50/60 Hz
Cold Start Timing:
- 120 sec.
Stroke Timing:
- Opening: 180 sec
- Closing: 480 sec
Stroke:
- 4mm
Force:
- 110 N
Application
The Controlli MVA43 Actuator is used in V.ZB globe valves coupling for cool/warm water control in two- and four-pipe terminal units and zone plants.
Operation
MVA actuators are of electro-thermal type and are controlled by an on-off signal or, for MVA41/43 only, by pulse width modulation too. Actuators are powered by control signal; this causes the heating of a thermostatic element. Consequently a small piston comes out and, opposing to return spring, lowers the valve stem. MVA23-43 actuators can be equipped with an auxiliary micro-switch mod. D41, which can be mounted by removing the side cover. The D41 micro-switch has the contact closed when the actuator is supplied. This is a particular application of fan-coil terminal unit since: the fan, connected to the microswitch contact on the actuator, operates with open valve and stops when valve is near to close position. This happens in order to avoid cool air throw.
