39
Operation
(Reference)
System Settings
Menu Item
Description
Automatic
Changeover
The control instruction is sent to the indoor units registered in the automatic cooling /
heating switch group when the control implementation conditions shown on the
previous page are fulfilled. The actual control instructions sent differ according to the
control method setting (fixed air conditioner / operating air conditioner selection /
average) and the fulfilled conditions such as to switch from cooling to heating. The
control instructions for each situation are shown below.
<Instructions sent to indoor units when control is implemented>
1.Fixed air conditioner/operating air conditioner selection methods
The control instructions are determined by the operation mode of the main indoor
unit and the main set temperature. Instructions regarding the operation mode and
the set temperature, shown below, are sent to all the indoor units registered in the
group once all the control implementation conditions on the previous page are
satisfied.
For this control, when the operation mode of the main indoor unit is automatic,
whether it is automatic cooling mode or automatic heating mode is checked when
judging the control conditions. Once the instructions have been determined, either a
cooling or a heating instruction is sent to indoor units in automatic operation mode.
(They switch from automatic to cooling or heating.)
2. Average Method
Unlike the fixed air conditioner and operating air conditioner selection methods, the
set temperature is decided based on considerations of the current set temperature
for each individual unit, without sending the same instruction based on the main
indoor unit to all the air conditioners. When implementing the control, the following
operation modes and set temperature instructions are executed.
NOTE:
When the Average method is selected, the temperature is not specified to the indoor
unit which the operation mode is not changed.
When conditions are met for
switching from heating to cooling
Operation mode
Set temperature
Heating / Automatic heating
cooling
main unit setting temptemperature difference
Cooling / Automatic cooling
cooling
main unit setting temperature
When conditions are met for
switching from cooling to heating
Operation mode
Set temperature
Cooling / Automatic cooling
heating
main unit setting temperature–temperature difference
Heating / Automatic heating
heating
main unit setting temperature
Operation mode
of the main
indoor unit
Operation mode
of the main
indoor unit
Instructions to indoor units registered in the
automatic cooling / heating switch group
Instructions to indoor units registered in the
automatic cooling / heating switch group
When conditions are met for
switching from heating to cooling
Operation mode
Set temperature
Heating / Automatic heating
cooling
Current set temptemperature difference
Cooling / Automatic cooling No instruction
No instruction
Other than the above
cooling
main unit setting temp
temperature difference
When conditions are met for
switching from cooling to heating
Operation mode
Set temperature
Cooling / Automatic cooling
heating
Current set temperature-temperature difference
Heating / Automatic heating No instruction
No instruction
Other than the above
cooling
main unit setting temperature–
temperature difference
Current indoor
unit operation
mode
Instructions to indoor units registered in the
automatic cooling / heating switch group
Instructions to indoor units registered in the
automatic cooling / heating switch group
Current indoor
unit operation
mode
81
See page