47
Operation
(Reference)
System Settings
Menu Item
Description
FC Change Over
combines the functions of
Changeover
and
Free Cooling
to maintain
the room temperature within a comfortable range while consuming minimal energy
through the use of outside air. A comfortable range is configurable.
FC Change Over replaces Automatic Changeover, Heating Mode Optimization
functions
and Setpoint Range limitation in the Group Settings.
A DIII Ai unit is needed to sense the outside air temperature.
[1] Features Overview
The two functions provided by the FC Change Over are:
(1)
Changeover
The Controller keeps the room temperature within a comfortable range by automatically
switching the operation mode among Cool, Heat and Fan. The comfortable range is
defined by the preset cooling setpoint (maximum temperature) and the preset heating
setpoint (minimum temperature) which are both configured by the user. The preset
cooling setpoint should be at least 2
°
C above the preset heating setpoint.
(2)
Free Cooling
The Controller reduces the cooling energy consumption by automatically controlling the
ventilation equipment through the intake of outside air by the equipment. This outside air
temperature should be lower than the room temperature. You can specify HRV and / or
an air damper which is connected to a D
#
Dio unit as the ventilation equipment.
You can configure a control group of indoor units and ventilation equipment for FC
Change Over up to 64 groups. Groups cannot overlap. Each group is controlled
independently.
You can specify the preset cooling and heating setpoints for each group and those
setpoints will override the setpoint of all indoor units in the group. The changeover of the
operation mode also affects all indoor units in the group, and is determined by the room
temperature (return air temperature) of the representative indoor unit which you
specified in the group.
FC Change
Over
See page
Maximum 64 groups
1)
Changeover
Controller automatically
switches the operation
modes and overrides the
setpoint of all indoor units in
the group.
2)
Free Cooling
Controller automatically
controls HRV unit and / or a
damper to intake the
outside air comparing the
room and outside air
temperatures.
!
-TC
D
#
plus adapter
Outside air
thermometer
(D
#
Ai)
Outdoor
unit
Outdoor
unit
Outdoor
unit
Representative
indoor unit
indoor
unit
indoor
unit
Control group
HRV unit
D
#
Dio
Damper, etc.
Representative
indoor unit
indoor
unit
indoor
unit
Control group
HRV unit
D
#
Dio
Damper, etc.
Representative
indoor unit
indoor
unit
indoor
unit
Control group
HRV unit
D
#
Dio
Damper, etc.
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