Viconics VT7000 Series Application Guide - Manual (Page 3)

3
Important Notes and Things to Know
When reviewing the following document and planning an application using a Viconics thermostat with PIR functionality, please
remember the important following notes:
• Configuration of PIR Functions: All PIR application related configuration parameters are displayed in the
configuration menu or available as objects in the network object list. However, the advanced occupancy functionality
of a PIR attached to a thermostat is only enabled if either:
- A Viconics VI-PIR cover is installed on the thermostat
- A remote input is configured as a remote PIR sensor ( Motion NO or Motion NC )
• PIR Cover Warm-Up Period: When VI-PIR accessory cover is used and a thermostat is powered up; there will be a
1 minute warm up period before any local movements can being detected and acknowledged by the PIR sensing
device. The local status LEDs for the VI-PIR cover will also not be active during that one minute period.
Only when that 1 minute period has elapsed after initial power up of the thermostat will the PIR functionality and local
movement status LEDs be activated.
• Setpoints: The implemented stand-by setpoints are under the same limitations and restrictions as the occupied and
unoccupied ones. This means that:
- They use exactly the same range:
• Heating setpoints range are: 40 to 90 °F ( 4.5 to 32.0 °C )
• Cooling setpoints range are: 54 to 100 °F ( 12.0 to 37.5 °C )
- They are always limited by the applied minimum deadband configuration
- They will be limited by the Heat Maximum and Cool Minimum configuration parameters
All individual cooling setpoints and all individual heating setpoints can be set independently. However, A typical
arrangement will always have the set value of the stand-by parameters residing between the corresponding occupied
and unoccupied setpoint values.
The installer must make sure that the difference between the stand-by and occupied value can be recovered in a
timely fashion when movement is detected in the zone and large enough to warrant maximum energy savings.
Ex.:
• Application Range: The range of applications covered with the PIR occupancy logic van be segmented in 2
important categories in terms of functionality. Both use different settings and have different behaviours:
- Hotel and lodging applications
- Standard commercial applications
Hotel and Lodging Applications can benefit the addition of an entry door switch wired to one of the appropriately
configured remote input of a thermostat.
When a door contact is used and configured, the Stand-By timer and its configuration are no longer active or used.
The occupancy front toggle between occupied and stand-by is now simply dictated by both the door contact and the
PIR sensing device used.
If movements are detected by the PIR cover, the room will always be occupied. The switch back to stand-by mode will
only happen if the door switch toggles open / close. Please review attached lodging application examples in the
document for more information
Standard Commercial Applications would not typically use a remote door switch contact attached to the
thermostat.
PIR occupancy functionality is simply dictated by both the Stand-By Timer and Unoccupied Timer configuration value
and movements being present or not in the area. Please review attached typical commercial application examples in
the document for more information
Occ Heat
= 72F
Occ Cool
= 75F
St-By Heat
= 69F
Unocc Heat
= 65F
St-By Cool
= 78F
Unocc Cool
= 82F
Room Temperature
Deadband