Appendix A: VAV Zone Controller Points/Properties
Unit Configuration
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UNIT
Point Name/Description
Default/Range
Heat Enable
– Enables the reheat function.
D:
R:
Enable
Disable/Enable
Parallel Fan Heat On Delay
– Parallel type terminal only. The delay before reheat is
enabled after the zone has a heating demand. The terminal fan runs immediately and
attempts to meet the heating demand using the heated air from the ceiling plenum.
D:
R:
15 minutes
0 to 30 sec
Fan Off Delay
– Fan-type terminals only. The amount of time the terminal fan continues to
operate after a heating demand is satisfied.
D:
R:
120 seconds
0 to 180 seconds
Maximum Heating SAT
– The maximum supply air temperature allowed while ducted heat
is operating. Ducted type supplemental heat is controlled so that it will not exceed this
limit.
D:
R:
105°F (40.6°C)
100 to 140°F
(37.7 to 60°C)
Maximum RH Override Airflow
– The maximum airflow allowed when the RH function
overrides the temperature control. When active, the damper modulates to the
temperature control requirement or the RH override airflow, whichever is greater. This
value is the percentage of the
Maximum Cooling Airflow Setpoint
.
D:
R:
60%
0 to 100%
DCV Max Vent Airflow
– The maximum airflow allowed when the IAQ function overrides the
temperature control. When active, the damper modulates to the temperature control
requirement or the
DCV Max Vent Airflow
, whichever is greater. This value is a percentage
of the
Maximum Cooling Airflow Setpoint
.
D:
R:
70%
0 to 100%
Filter Service Alarm Timer
– Fan type terminals only. The amount of time the fan will run
before generating a
Filter Alarm
. Set to 0 to disable the alarm.
D:
R:
0 hr
0 to 9999 hr
Pushbutton Override
– Enables or disables the use of a pushbutton override from a local
space temperature sensor.
D:
R:
Enable
Disable/Enable
Setpoint Adjustment
– Enables or disables the setpoint adjustment mechanism on the
local space sensor.
D:
R:
Enable
Disable/Enable
Setpoint Adjustment Range
- The maximum amount that a user can adjust the setpoint
on the local SPT sensor.
D:
R:
2∆°F (1.1∆°C)
0 to 5∆°F
(0 to 2.7∆°C)
Heating Lockout Temperature
– Supplemental reheat is disabled if outside air
temperature exceeds this value. Supplemental reheat is enabled when the outside air
temperature falls below a fixed hysteresis of 2∆°F (1.1∆
°C). This function is active only if
there is a valid network outside air temperature.
D:
R:
70°F (21.1°C)
35 to 150°F
(1.6 to 65.5°C)
Power Fail Restart Delay
– How long the controller delays normal operation after the
power is restored. This is typically used to prevent excessive demand when recovering
from a power failure. Applies to Series Fan start delay when system mode transitions from
unoccupied to occupied. A delay of no greater than 120 seconds is recommended for
Series Fan applications.
D:
R:
60 seconds
0 to 600 seconds
52
VAV Zone Controllers