Viconics VT7000 Series Application Guide - Manual (Page 23)

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• 22) VT7300 Networked fan coil application using 2 levels of occupancy with a remote PIR sensor
Set-up and Configuration
Thermostat used VT73x5X5000(BorE)…( lodging models )
PIR used BI1 configured for remote PIR sensor
BI2 Configuration Door dry contact
Stand-by timer value Not used
Unoccupied timer value 0.0 hours
Network interface used Echelon or BACnet MS-TP
Advanced network interface can be obtained when thermostats are fully
integrated to the reservation system
In these cases, the occupancy network commands state enumerations text
presented by a front end system can be expanded to better represent the
nature of the application.
Occupancy network commands state Front end system state text examples
Local Occupancy ( PIR active ) Room rented PIR economy enabled
Occupied Room rented high comfort assured
Unoccupied Room not rented
Sequence of operation:
At initial power-up, when the thermostat 24 Vac power supply is applied; if there is no occupancy network command received
by the thermostat and if the PIR device do not detect any movements, the initial occupancy of the zone will be stand-by mode.
Occupied state network command
At any time, an occupied network command will always force the local zone to be in occupied mode and to use the occupied
setpoints.
Unoccupied state network command
At any time, an unoccupied network command will always force the local zone to be in unoccupied mode and to use the
unoccupied setpoints. If the thermostat local override function is not locked out by configuration, the local user may initiate a
temporary local override to occupied as dictated by the temporary occupancy time configuration parameter setting.
Local occupancy state network command
When the thermostat receives a local occupancy state network command, the local PIR occupancy loop will now be enabled.
If the PIR devices do not then detect any movements, the occupancy of the zone will be stand-by mode.
As soon as the PIR device detects a movement or motion, the occupancy status switches to occupied and the occupied
setpoints are used. The room will then be in occupied mode until a door toggle is detected.
If a door toggle is detected, then the room switches to stand-by mode and the stand-by setpoints are used. If any occupants
are left in the room, local movements must be seen to resume the occupied mode.
At anytime, if the PIR device detects a local movement or motion, the occupancy status switches to occupied and the
occupied setpoints are used.
The local zone never goes into unoccupied mode and the unoccupied setpoints are never used.
Remote PIR Sensor BACnet or Echelon Network
Door Switch
Unoccupied Time
= 0 Hours
First Movement Detected
by a PIR Device
Occupied
Stand-By
Unoccupîed
Time
Network Command
= Local PIR Occupancy
Initial Network
Command = Unoccupied
PIR Movements Ignored
Network Command
= Occupied
PIR Movements Ignored
Network Command
= Unoccupied
PIR Movements Ignored
Always
Occupied
Door Open/Close
Toggle Detected