Viconics VWZS Application Guide - Manual (Page 9)

9
2) Zone Controllers VZ7260X5x00W Operation
The following information needs to be carefully read and properly understood if proper system
commissioning is to be achieved.
Contrary to low end commercial and residential zoning controllers which use a two positions open-close
actuator, Viconics VZ7260X5x00X uses proportional analog 0 to 10 VDC modulating damper actuator. This
enables performances and control sequences to be much closer to what is normally found in DDC
application specific control devices.
The operation of the zone controllers is intrinsically linked with the operation of their RTU controller.
Although it will operate in a stand-alone mode if the communication network is down, normal operation of
the system as a whole requires that communication with the RTU controller is functional.
Data exchanged from the zone controllers to the RTU controller:
• Current PI heating demand ( output value is based on PI heating weight configuration )
• Current PI cooling demand ( output value is based on PI cooling weight configuration )
Data exchanged from the RTU controller to the zone controllers:
• Current central system occupancy
• Current system mode active ( hot air or cold air being delivered )
• Outdoor air temperature