Error! No text of specified style in document. DNS-24, DNT-T103, & DNT-T221 Application Guide
Page 16 of 35
Document Edition 3.1
SETPOINTS
The BACstat II uses a series of setpoints for various purposes, most of which interact with one another.
For a complete list of these setpoints and other objects and their defaults, refer to the Object table on page
9. It is important to note that when you change the units setting between ºC and ºF all of these setpoints
will revert back to their matching default values – the BACstat does not do a conversion on-the-fly. What
follows hereafter is a working description for each of these setpoints. If the particular setpoint is settable
in the Configuration Menu it is indicated with its LCD text.
Day Setpoint (AV6) – SEt
This is the setpoint used when in D
AY mode. With the Display Code (AV15) set to an appropriate value
the setpoint can be adjusted up or down by pressing the buttons. Whether or not this setpoint is displayed
or is adjustable on the LCD, it is used internally for control. The units for the setpoint are ºC or ºF (as per
AI1) unless the second digit of the Display Code (AV15) is set to 3 (for Humidity), in which case the units
become %RH. The value for Day Setpoint can also be set in the Configuration Menu, or by commanding
the variable (via GCL or ORCAview OWS or 3
rd
Party devices).
Day Minimum Setpoint (AV7) – LO
This is the minimum value a user can adjust the Day Setpoint to. If an attempt is made to adjust the Day
Setpoint lower, it will not change. 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) – HI
This is the maximum value a user can adjust the Day Setpoint to. If an attempt is made to adjust the Day
Setpoint higher it will not change. If a higher value is commanded from the OWS or another device, it
will not accept the change. 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) – DIF
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 14. 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 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 - 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 Setpoint + Day Differential).
This value is not directly adjustable. It can only be adjusted by setting either the Day Setpoint or the Day
Differential.
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