Features & Benefits
Electro-Mechanical Actuators – Modulating with feedback
Forced convection (active) terminal units, i.e. FCU (Fan Coil Units) and active Chilled Beams are designed to be very responsive to changes in room temperature.
Modulating actuators enable flow rate changes, and consequently heat output changes, to quickly match demand requirements, therefore, modulating actuators should be chosen for forced convection terminal units.
Modulating actuators allow all intermediate flow rates between full flow and no flow.
The actuator can actively communicate its stroke position to the control system to monitor building operations.
Feedback signal allows customers to monitor the exact actuator position and can be a benefit for maintenance. On a typical site there will be hundreds of actuators and it can be difficult to diagnose a system fault.
Feedback signal can be used to identify issues e.g. valve is sticking, perhaps due to debris in the pipe. Variation in feedback signal during operation could also be an indication that the valve / actuator will require maintenance soon. This means feedback feature could be viewed as a tool for preventative maintenance.
It is important to note that the feedback signal reports the actual position of the actuator, and is not simply the control signal repeated. For example if the control signal is set to 5V (Linear control) and the
Thermal Actuators – On/Off
Natural convection (passive) terminal units, i.e. passive Chilled Beams and underfloor heating are designed to be less responsive to changes in room temperature than forced convection terminal units.
Therefore, thermal on/off actuators should be chosen for natural convection terminal units.
On/off actuators only allow for full flow or no flow