Part
2. Functional Specifications
DCM014A51
Design Guide
57
2. The number of significant digits is up to one decimal place for degrees Celsius and zero
decimal places for degrees Fahrenheit.
3. The settable values are fixed by the system (10.0 to 31.1 [°C] / 50 to 88 [°F]).
If a value outside the range is written, it is corrected to the upper/lower limit value.
4. Out_Of_Service property
If TRUE:
The setback temperature (heat) is disabled.
If FALSE: The setback temperature (heat) is enabled.
The following table shows the correspondence between the Out_Of_Service property
status and the response of the Present_Value and setback temperature (heat) on the
indoor unit to the command from the BMS.
Response to command
from BMS
Out_of_Service
property
Present_Value
Setback temperature
(heat)
TRUE
Error
ErrorClass=PROPERTY
ErrorCode=WRITE_ACCESS_DENIED
No change
FALSE
Change
←
When the Out_Of_Service property changes from TRUE to FALSE, the Present_Value
changes to the value set on the
iTM
.
If the unoccupied heating setpoint point is set by the
iTM
, the BMS does not need to
change the Out_Of_Service property unless a value change is needed.
The table below shows the correspondence between the current status of the
Out_Of_Service property and the Present_Value when a command for Out_Of_Service
property is sent from the
iTM
or BMS.
Command value
Current status
iTM
(Command sent by operating the unit)
BMS
TRUE (Disable)
FALSE (Enable)
TRUE
FALSE
TRUE
―
―
―
―
FALSE
○
―
―
―
○
: Present_Value changed to that of Relinquish_Default.
─: Present_Value remains unchanged.
5. Relinquish_Default property is fixed to 17.8°C/64°F.
6. When subscribed to COV notification, the COV_Increment property is fixed to 1.0 and
cannot be changed.
COV notification is issued when a change of 1°C/1°F or more is detected.
The next COV notification is issued when the temperature further changes for 1°C/1°F or
more from the value of the Present_Value property that triggered the previous COV
notification.
7. Value is associated with the heating setback setpoint of the
iTM
.