![Delta Controls BACstat III DNT-T221-FCU Application Manual Download Page 17](http://html1.mh-extra.com/html/delta-controls/bacstat-iii-dnt-t221-fcu/bacstat-iii-dnt-t221-fcu_application-manual_2475138017.webp)
Document Edition 1.3
Page 17 of 30
Day Minimum Setpoint (AV7) –
This is the minimum value to which a user can adjust the Day Setpoint. If a lower value is commanded
from the OWS or another device, it will not accept the change. The value for Day Minimum Setpoint can
be set in the Configuration Menu, or by commanding the variable (via GCL+ or ORCAview OWS or 3
rd
Party devices).
Day Maximum Setpoint (AV8) –
This is the maximum value to which a user can adjust the Day Setpoint. It will not accept a higher value.
The value for Day Maximum Setpoint can be set in the Configuration Menu, or by commanding the
variable (via GCL+ or ORCAview OWS or 3
rd
Party devices).
Day Differential (AV9) –
This is the differential setting between the Day Setpoint and the internal Heating Setpoint (which is used
for heating control), and between the Day Setpoint and the internal Cooling Setpoint (which is used for
cooling control). The one value is used for both, one on each side of the Day Setpoint. Refer to the
diagram on page 15.
The purpose of this setting is to separate heating from cooling so as to prevent overlap, and to create a
reasonable null zone, within which no modulating control takes place ( preventing unnecessary actuator
wear when the measured value is close to or on the setpoint). The value for Day Differential can be set in
the Configuration Menu, or by commanding the variable (via GCL+ or ORCAview OWS or 3
rd
Party
devices).
Day Heating Setpoint (Internal)
This is the setpoint used internally for heating control (which is the Day Setpoint – ½ Day Differential).
This value is not directly adjustable. It can only be adjusted by setting either the Day Setpoint or the Day
Differential.
Day Cooling Setpoint (Internal)
This is the setpoint used internally for cooling control (which is the Day Se ½ Day Differential).
This value is not directly adjustable. It can only be adjusted by setting either the Day Setpoint or the Day
Differential.
Night Heating Setpoint (AV10)
This is the setpoint used when in Night mode and night setback heating is required. If the current
temperature is below the current Day Setpoint when in Night mode, this value is displayed on the BACstat
LCD (depending on how setpoint display has been defined by the Display Code).
This value is not adjustable by a user. It can only be adjusted through the configuration menu or by
commanding the variable (via GCL+ or ORCAview OWS or 3
rd
Party devices). Pressing the up or down
arrow cycles to show the Night Cooling Setpoint.
Night Cooling Setpoint (AV11)
This is the setpoint used when in Night mode and night setback cooling is required. If the current
temperature is above the current Day Setpoint when in Night mode, this value is displayed on the
BACstat LCD (depending on how setpoint display has been defined by the Display Code).
This value is not adjustable by a user. It can only be adjusted through the configuration menu or by
commanding the variable (via GCL+ or ORCAview OWS or 3
rd
Party devices). Pressing the up or down
arrow cycles to show the Night Heating Setpoint.