Viconics VT7000 Series PIR Application Guide - Manual (Page 8)

8
• VT765x Stand-alone application using 2 levels of occupancy with a VI-PIR accessory cover
Scheduling models
Set-up and Configuration
Thermostat used Scheduling VT765xX5000
PIR used COV-PIR-RTU-C-5000 accessory cover
Unoccupied timer value 0.5 hours
Network interface used None, stand-alone
Sequence of operation:
At initial power-up, when the thermostat 24 Vac power supply is applied; the initial occupancy of the zone will be as dictated
by the local thermostat schedule.
If the thermostat schedule is Unoccupied, then the local occupancy mode will be unoccupied and the unoccupied setpoints
will be used.
During unoccupied periods by the schedule, the PIR function is not used and the device will remain unoccupied independently
of movements or motion detected.
During an unoccupied periods by the schedule, a local override can me made by a user by using the “Override Schedule
Y/N?” question prompt In the menu. The override duration will be equivalent to the value set in the “ToccTime” configuration
parameter. The PIR function is not used during the local override period.
The PIR function is only used when the local thermostat is in occupied mode as dictated by the local schedule.
During the occupied period as dictated by the local schedule; as soon as the PIR device detects a movement or motion, the
occupancy status switches to occupied mode and the occupied setpoints are used.
if no movement is detected after the 0.5 hour timer expires, the thermostat occupancy will switch to unoccupied mode.
Anytime the PIR device detects local motion during the occupied period as dictated by the local schedule, the elapsed
unoccupied timer value will be reset. 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 during the occupied period as dictated by the local schedule,
the occupancy status switches to occupied mode and the occupied setpoints are used.
When the thermostat switches to an unoccupied periods as dictated by the local schedule, the PIR function is not used and
the device will remain unoccupied independently of movements or motion detected.
Ceiling mounted
AC or HP unit
Occupied
Unoccupîed
Time
Local schedule = Occupied
Time
Unoccupied Time Elapsed
= Unoccupied Mode
Last Movement Detected
by PIR Activity
Unoccupied Time
= 0.5 Hours
Unoccupied Time
= 0.5 Hours
Unoccupied Time Elapsed
= Unoccupied Mode
Last Movement Detected
by PIR Activity
Local schedule = Unoccupied
Last Movement Detected
by PIR Activity