53
Operation
(Reference)
System Settings
Menu Item
Description
FC Change
Over
(2) Control sequence when the representative indoor unit is in off
With the
FC Change Over
function, control is conducted by the return air temperature of the
representative indoor unit (fixed) as the room temperature. In order for I-TC to reference the
return air temperature of the representative indoor unit, the representative unit must be
operating. Therefore, when the representative indoor unit is switched off, in a malfunction
state, or communication error state, the
FC Change Over
function itself does not work.
When any indoor units other than the representative indoor unit are off, in a malfunction or
communication error state, FC Change Over will be conducted only with indoor units that are
operating normally.
(3)Selection of representative indoor unit
Please do not assign the indoor unit where the room temperature changes often, e.g. near a
window etc., as the representative indoor unit to prevent short cycling the FC Change Over
sequence of operation.
(4) When D
#
Ai is not connected
The FC Change Over function uses the D
#
Ai to detect the outdoor temperature. When
the D
#
Ai for outdoor temperatures is not connected to the system, has a failure, or is in
communication error state, the
FC Change Over
function does not work.
(5) Ventilation equipment
When an isolation damper, for example, is used for ventilation control, it is necessary for it
to be connected to the output of D
#
Dio.
Applicable to HRV Type G and later.
When no ventilation equipment is registered in a control group, only the
Changeover
sequence can be conducted.
(6) Main and sub controller
This function can work only in the main I-Touch Controller. It is not available in the sub I-
Touch Controller.
(7) The temperature display and the control operation
Even if the room temperature display reaches the setpoint of the control,
the control sequence might not be immediately executed because the temperature value
is rounded to the tenth digit for display and the actual temperature may not have yet
achieved the setpoint.
See page
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