Viconics VT7000 Series Application Guide - Manual (Page 15)

15
• 11) VT7300 Networked fan coil application using 3 levels of occupancy with dual PIR sensors
Set-up and Configuration
Thermostat used VT73x0X5000(BorE) ( commercial models )
PIR used BI1 configured for remote PIR sensor and
COV-PIR-FCU-C-5000 accessory cover
BI2 Configuration None, no function
Stand-by timer value 2.0 hours
Unoccupied timer value 6.0 hours
Network interface used Echelon or BACnet MS-TP
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 while in the local occupancy state network command, the
occupancy status switches to occupied and the occupied setpoints are used.
Anytime the PIR device detects local motion, the elapsed stand-by timer value will be reset. If no motion is detected in the
zone for the entire stand-by timer duration, then the room switches to stand-by mode and the stand-by setpoints are used.
While in stand-by mode, if no motion is detected in the zone for the entire unoccupied timer duration, then the room switches
to unoccupied mode and the unoccupied setpoints are used.
At anytime, if the PIR device detects a local movement or motion, the occupancy status switches to occupied and the
occupied setpoints are used.
Remote PIR Sensor BACnet or Echelon Network
Unoccupied Time
= 6 Hours
Stand-By Time
= 2 Hours
First Movement Detected
by a PIR Device
Occupied
Stand-By
Unoccupîed
Time
Stand-By Time Elapsed
= Stand-By Mode Unoccupied Time Elapsed
= Unoccupied Mode
Network Command
= Local PIR Occupancy
Initial Network
Command = Unoccupied
PIR Movements Ignored
Network Command
= Occupied
PIR Movements Ignored
Network Command
= Unoccupied
PIR Movements Ignored