Appendix A: VAV Zone II Points/Properties
VAV Zone II Controllers
CARRIER CORPORATION ©2019
Installation and Start-up Guide
All rights reserved
78
Point Name/Description
Range
English
Metric
Optimal Start Type
– The method used to change from unoccupied to occupied
setpoint.
Options:
None*
– Unit will not change to occupied setpoint until the scheduled time or the unit
goes into an occupied mode. Setpoints do not ramp, but change immediately from
unoccupied to occupied values.
Temp Compensated*
– Unit changes to occupied setpoints at a variable time prior to
the occupied time, which is calculated by the current difference between space
temperature and the appropriate heating or cooling setpoint. At that time, the setpoints
do not ramp, but change immediately from unoccupied to occupied values.
Learning Adaptive Start
– Unit gradually changes to occupied setpoints by adjusting the
unoccupied setpoints over a specified period of time to achieve the occupied setpoint
by the time scheduled occupancy begins.
D:
R:
Temperature Compensated
None
Temperature Compensated
Learning Adaptive
Heat Start K factor (min/deg)
– If
Optimal Start Type
is
Temp Compensated
, this is the
time in minutes per degree that the equipment starts before the occupied period when
the space temperature is below the occupied heating setpoint (including any setpoint
offset).
D:
R:
15.00
0 to 99
Cool Start K factor (min/deg)
– If
Optimal Start Type
is
Temp Compensated
, this is the
time in minutes per degree that the equipment starts before the occupied period when
the space temperature is above the occupied cooling setpoint (including any setpoint
offset).
D:
R:
15.00
0 to 99
Standby Offset
– The value by which the occupied setpoints are expanded when the
space occupancy sensor indicates that the space is unoccupied. If 0, the unoccupied
setpoints are used.
D:
R:
0 °F/ °C
0 to 15 °F
(0 to 8.3 °C)
Occupied RH Control Setpoint
– If
Optional Sensor Type
is set to
RH Sensor
and
RH
Control
is set to
Enable
, this is the relative humidity setpoint during occupancy. The air
source mode must be
Cool
or
Vent
and the terminal mode must be
Cooling
or
Vent
before the dehumidification function can be active.
D:
R:
65%rh
0 to 100%rh
DCV Start Ctrl Setpoint
– If
Optional Sensor Type
is set to
IAQ Sensor
and
DCV Control
is set to
Enable
, this is the value that the CO2 sensor must exceed to begin the DCV
control function. This value should be set to approximately 75 ppm above the outdoor
air CO2 level.
D:
R:
500ppm
0 to 9999 ppm
DCV Max Ctrl Setpoint
– If
Optional Sensor Type
is set to
IAQ Sensor
and
DCV Control
is
set to
Enable
, this is the value that the CO2 level must exceed to begin the IAQ function
to control the damper to
DCV MAX Vent Airflow
.
D:
R:
1050ppm
0 to 9999 ppm
Parallel Fan ON Value
– If
Terminal Type
is
Parallel Fan
and the zone does not require
heating, when the zone’s airflow control setpoint decreases below this value, the
parallel fan turns on to increase airflow, ventilation, and prevent cold air dumping into
the zone. If the airflow control setpoint rises above this value by more than 1 cfm
(liters/sec), the parallel fan turns off. We recommend this value be set to approximately
10% above the
Occupied Min Airflow
setpoint. Set to 0 to disable this function.
D:
R:
0 cfm (liters/sec)
0 to 99999 cfm
(liters/second)
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