Installation & Operation Manual - Model AVC5000
Contents of this Manual are Subject to Change Without Notification
Page 34
Example 4: Setback using Presence Sensor on DI-1 and Occupancy Sensor on DI-2
Dry Contact Input Logic:
FH Presence Detected: DI-1=OPEN
No FH Presence Detected: DI-1=CLOSED
Occupancy Detected: DI-2=OPEN
No Occupancy Detected: DI-2=CLOSED
Control Set Point Sequence for Example 4
DI-1 and DI-2 are both
OPEN
Lab is Occupied and Presence is detected at Fume Hood
Controller will maintain face velocity at 100 FPM with a minimum volume limit
of 120 CFM and a maximum volume limit of 850 CFM
DI-1 changes from
OPEN to CLOSED
DI-2 remains OPEN
Lab is Occupied and No Presence is detected at Fume Hood
30 seconds after the DI-1 state changes from OPEN to CLOSED;
•
Face Velocity Set Point changes from 100 to 80 FPM
•
Min Volume Limit remains at 120 CFM
•
Max Volume Limit remains at 850 CFM
•
LCD Display shows “
FH U
nOcc” message
DI-1 changes from
CLOSED to OPEN
DI-2 remains OPEN
Lab is Occupied and Presence is detected at Fume Hood
Immediately after the DI-1 state changes from CLOSED to OPEN;
•
Face Velocity Set Point changes from 80 to 100FPM
•
Min Volume Limit remains at 120 CFM
•
Max Volume Limit remains at 850 CFM
•
LCD Display no longer shows “FH UnOcc” message
DI-1 is OPEN
DI-2 changes from
OPEN to CLOSED
Lab is Unoccupied, however Presence is detected at Fume Hood
•
Face Velocity Set Point remains at 100 FPM
•
Min Volume Limit remains at 120 CFM
•
Max Volume Limit remains at 850 CFM
•
LCD Display shows “LabUnOcc” message
Note:
The occupancy sensor may have an internal time delay of its own. Before setting
the AVC DI time delays, check to see if the occupancy sensor has a time delay and be
sure to take this into consideration when setting the AVC DI time delays.
Enable both DI-1 and DI-2
Select either Dry Contact or BACnet
Enter the Face Velocity Setpoint and
Volume Limits for each of the four
corresponding DI states
Save Changes
Enter the time delay for the controller
to respond to the DI state changes
Enter Messages to be displayed on LCD
during the DI closed state (8 char. max)
