Appendix A: VAV Zone Controller Points/Properties
Point Name/Description
Default/Range
Fan
– The current value of the fan output relay. To override normal control for
troubleshooting purposes, select
Lock value to
and then enter
On
or
Off
. The relay
stays in that state until the
Lock value to
checkbox is cleared.
R: Off/On
Cooling Max Airflow
– The maximum airflow the terminal will supply when trying to
meet a zone cooling demand when the air source mode is Cooling, Vent, or Free
Cooling.
D:
R:
2100 cfm
(991.2 liters/second)
0 to 99999 cfm
(liters/second)
Heating Max Airflow
– The maximum airflow the terminal will supply when trying to
meet a zone heating demand when the air source mode is Heating or Warm-up and
VAV heating
has been enabled.
D:
R:
2100 cfm
(991.2 liters/second)
0 to 99999 cfm
(liters/second)
Occupied Min Airflow
– The minimum airflow setpoint the terminal controls to when
the air source is operating and the terminal mode is occupied.
D:
R:
315 cfm
(148.9 liters/second)
0 to 99999 cfm
(liters/second)
Unoccupied Min Airflow
– The minimum airflow setpoint the terminal controls to
when the air source is operating and the terminal mode is unoccupied.
D:
R:
315 cfm
(148.9 liters/second)
0 to 99999 cfm
(liters/second)
Auxiliary Heat Min Airflow
– ONLY used for Single Duct units with ducted reheat. Set
to the minimum airflow specified by the manufacturer to allow the reheat to provide
optimum performance. This value is compared to the appropriate
Min Airflow
value
above and the greater of the two values determines the damper position. For all
other terminal types, set to 0.
D:
R:
1680 cfm
(793 liters/second)
0 to 99999 cfm
(liters/second)
Test and Balance
– Use the following command buttons when commissioning a zone, balancing the system, replacing
the zone controller, or troubleshooting. If
Automatic Control
is not selected within 4 hours, the controller will resume
normal control.
Zero Flow
– Closes the damper, takes a number of flow samples, then sets the zero calibration.
Damper Full Open
– Opens damper fully and enables the
Damper Full Open
calibration fields.
Cool Max Airflow
– Forces the damper to its maximum cooling position. Calibration fields apply only if the primary use of
this damper is cooling.
Occupied Min Airflow
– Forces the damper to its maximum cooling position. Calibration fields apply only if the primary
use of this damper is cooling.
Automatic Control
– Returns the damper to its normal control routines.
This must be activated when you finish using
any of the other Test and Balance commands.
Close
Damper
– Forces the damper to its full closed position.
Heat Max Airflow
– Forces the damper to its maximum heating position. Calibration fields apply only if the primary use
of the damper is heating.
System Space Temperature
– The current value of the controlling space temperature
received over the network from another source. -999 indicates no value has been
received and it will not be used.
R: -50 to 150°F
(-45.5 to 65.5°C)
System Setpoint Adjustment
– The space temperature setpoint adjustment value received
over the network.
R: -
5 to 5∆°F
(-
2.7 to 2.7∆°C)
System Space RH
– The relative humidity received over the network. -999 indicates no
value has been received and it will not be used.
R: 2 to 100%
64
VAV Zone Controllers
