6. Programming Notes
10 Quick User Guide DCM014A51
6.4 Setpoints Range Limitation
“Maximum Cooling Setpoint – Minimum Cooling Setpoint – Maximum Heating Setpoint – Minimum Heating
Setpoint” are the points used to set the setpoints range limitations.
•The Out_Of_Service property for those points is true by default, which will need to change to false in
order to set the range values or enable setpoint range limitation from the iTM.
•The Out_Of_Service properties of Min Cooling Setpoint or Max Cooling Setpoint are synced, if one of
them changes (to True or False), the other will change and the same is true for the Min Heating setpoint
and Max Heating setpoint.
•Suggested setpoint range is 70-74°F for cooling and 66-70°F for heating.
6.5 Schedule
“Enable iTM Schedule Operation” point allows the BMS to enable or disable all schedule programs configured
on the ITM.
•The iTM can handle the everyday scheduling of the indoor unit groups.
•There are 4 types of schedules that can be set in the iTM 7 day, Weekday/Weekend, Weekday/Saturday/
Sunday and Everyday.
6.6 Timed Override
“Time Override Minutes” is number of minutes that can be set from the BMS, which represent the timer
extension on the iTM. This function sets up the time to stop the indoor unit.
“Time Override Operation” Monitors the status of the Timer Extension, and configures it for the indoor unit.
When the timed override function is enabled for an indoor unit group, the units will be turned off automatically
after the preset timer has expired if the unit is turned on during the unoccupied period.
6.7 Remote Controller Prohibits
Remote controller prohibits (On/Off, Mode and Setpoint) may be enabled/disabled by the objects provided to
the BMS or the iTM.
•If the BMS sets the Setpoint Range Limitation, prohibiting the remote controller setpoint adjustment
should not be enabled.
•The Remote Controller On/Off and Mode adjustment can be prohibited during the occupied hours, but
the On/Off may need to be permitted during the unoccupied period for the Timed Override operation.
•When more than one indoor unit is connected to a single remote controller group, the BMS should only
send commands to the indoor unit that is designated to receive the command for the remote controller
group (unit#0). BMS should not send commands to other indoor units in the remote control group. If this
object is sent to the other indoor units in the remote controller group, the indoor unit will not execute
this command.
6.8 Forced System Shutdown
The “Forced System Off” point can be used to turn off all indoor unit groups connected to the iTM via the DIII-
Net communication bus when an emergency signal has been received by the BMS.
•Emergency Stop program should have been configured and enabled in advance on the iTM.
•Indoor unit groups cannot be restarted from the remote controller until the "Forced System Off" point has
been set to inactive.
