Viconics VBZS Application Guide - Manual (Page 17)

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2 G) Passive Infra Red Motion Detector Cover (PIR)
The Viconics zone controllers are compatible with the new Viconics PIR (Passive Infra Red) cover
accessory. Controllers equipped with a PIR cover provide advanced active occupancy logic, which can
automatically switch occupancy levels from occupied to stand-by as required when local activity is detected
in the room.
This advanced occupancy functionality provides advantageous energy savings during occupied hours
without sacrificing occupant comfort. All zone controllers can be ordered with or without a factory installed
PIR cover.
This allows zones, which are infrequently occupied such as a conference room, storage areas or other
rooms to use relaxed set points during periods when there are no occupants present in the zone.
The advantage of using stand-by set points is to permit the system to recover fairly rapidly from stand-by to
occupied set points once movements are detected in a zone. The relaxed values of the stand-by setpoints
need to be far enough from occupied set points to optimise the energy savings a PIR cover can provide yet
close enough for the system to recover quickly and be within the occupants comfort zone in as short a time
as possible. If the span (Delta Temperature) from occupied to stand-by setpoints is too large, the zone will
not be able to recover quickly and the occupants will be left uncomfortable for the duration of the occupied
periods initiated by the PIR.
In order for the PIR logic function to be enabled, the following settings must be enabled at the zone
controller.
- If a local PIR cover is used, be sure to set the (PIR Func) parameter to ON.
- If a remote PIR sensor is used on BI1, be sure to set the (BI1) parameter to Motion NO or Motion
NC.
PIR logic
The PIR function is only used during occupied periods. If occupancy is desired during an unoccupied
period, simply press the local override button (if allowed by the local lockout level configuration). Then local
occupancy will toggle to override (local occupied) as per the ToccTimer time value for overrides.
Zone commanded occupied by the RTU schedule
Initial state when no movements
are detected by the PIR sensor Stand-by
Initial movement detected by the
controller ( PIR cover or remote
PIR ) Occupied for 60 minutes after the last movement has been
detected. When the 60 minute timer value has expired and no new
movements have been detected, the controller will resume the
stand-by mode.