Part
4. Programming Guide
DCM014A51
Design Guide
125
2.2 Setpoint Range Limitation
1. Refer to sections 7.2 (10.) – 7.2 (13.) in Part 2.
2. The Min and Max cool and heat setpoints should be enabled and set in the
iTM
during
commissioning. Values set in the
iTM
can be monitored and adjusted from the BMS.
2.3 Auto-Changeover Configuration
1. Auto-changeover should be configured at the
iTM
prior to the BMS integration. This will
prevent the need for the BMS to program the auto-changeover for each indoor unit group from
the master workstation. See section 3.2 (3.) in Part 1, and 7.3 (2.) in Part 2.
2.4 Schedule
1. The BMS should set the Occupied, Unoccupied, and Standby modes from the BMS Master
Schedule (if the
iTM
Schedule is not used). See section 7.2 (1.) in Part 2 for details on Standby
mode.
2. If the BMS Master schedule is used the Optimum Start should be configured from the Master
Schedule.
2.5 Timed Override
1. During the unoccupied period (while Occupancy Mode is Unocc), the timed override is
automatically allowed utilizing the Timer Extension function for the
iTM
Indoor Unit
Management Point. While the Occupancy Mode is Occ, the occupied period is automatically
disabled. See section 7.2 (1.) in Part 2. The timed override time can be set by the BMS with the
Timed Override Minutes point. The typical setting is 120 minutes (2 hours). See section 7.3 (3.)
in Part 2.
2. The timed override can be enabled/disabled by the BMS with the Timed Override Operation if
necessary. See section 7.2 (18.) in Part 2.
3. Override status can be determined with the Current Unit Operation point. See section 7.2 (19.)
in Part 2.
2.6 Remote Controller Prohibits
1. Remote controller prohibits (On/Off, Mode and Setpoint) must be enabled/disabled by the
objects provided to the BMS. See sections 7.2 (20.) – 7.2 (22.) in Part 2.
2. The Remote Controller prohibits can also be set from the
iTM
touch screen or web browser.
3. Prohibiting the remote controller setpoint adjustment should not be enabled if the BMS sets
the Setpoint Range Limitation (see section 7.2 (22.)).
Mode
Min Setpoint
Max Setpoint
Occupant
Note
Cool Mode
70
o
F
74
o
F
Can
adjust setpoint from
70
o
F to 74
o
F
from a zone
controller.
Allows ± 2
o
F adjustment from
72
o
F in Cooling and 68
o
F in
heating set in schedule.
BMS can set range limit
according to controls
specifications.
Heat Mode
66
o
F
70
o
F
Can
adjust setpoint from
66
o
F to 70
o
F
from a zone
controller.
