Part
2. Functional Specifications
52
Design Guide
DCM014A51
7.2 Individual Object Specifications
1. Individual indoor unit object specifications
a.
Occupancy Mode
Member number: 1
Object name:
Occupancy Mode
Object type:
Multistate Output
Description:
Controls the indoor unit based on the occupancy status.
Present_Value property:
1: Unocc
2: Occ
3: Standby
Notes:
1. Controls the indoor unit in accordance with the command also when the same value is
written to Present_Value.
2. Present_Value is set to "1" at
iTM
start-up.
3. Relinquish_Default property is fixed to "1".
When the BMS changes the present value property of the Occupancy Mode object, the
iTM
sends the operation command to the indoor unit and enables/disables the Timer
Extension of the indoor unit management point on the
iTM
as follows:
iTM Action
*1
Occupancy Mode
Sends
On/Off Command
to Indoor Unit
Sends
Energy saving
command
to Indoor Unit
Enable/Disable Timer
Extension of Indoor Unit
management point on iTM
Occ
On
Disable
Disable
Standby
On
Enable
*2
Disable
Unocc
Off
Disable
Enable
*1
iTM
sends the on/off operation command to indoor unit, even if the indoor unit has
the same on/off state.
*2 If the BMS sets ‘Standby’ to the present value property of Occupancy Mode Object,
Remote Controller displays “Central Control” on its screen. When enabled, the indoor
unit setpoint is offset (increased in cool mode or decreased in heat mode) by a fixed
internal value of 3.6
o
F (2
o
C). This value (offset) is not displayed on the local controller,
iTM
or
BACnet
Server’s setpoint present value as the actual setpoint is unchanged.
