Table of Contents
Advertisement
Appendix A: VAV Zone II Points/Properties
Point Name/Description
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.
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).
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).
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.
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.
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.
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.
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.
VAV Zone II Controllers
Installation and Start-up Guide
78
Range
English
Metric
D:
Temperature Compensated
None
R:
Temperature Compensated
Learning Adaptive
D:
15.00
R:
0 to 99
D:
15.00
R:
0 to 99
D:
0 °F/ °C
R:
0 to 15 °F
(0 to 8.3 °C)
D:
65%rh
R:
0 to 100%rh
D:
500ppm
R:
0 to 9999 ppm
D:
1050ppm
R:
0 to 9999 ppm
D:
0 cfm (liters/sec)
R:
0 to 99999 cfm
(liters/second)
CARRIER CORPORATION ©2019
All rights reserved
Hide quick links:
Advertisement
Table of Contents
