40
Operation
(Reference)
System Setup
Menu Item
Description
Change
Over
Settings
<Precautions when using this control>
1.Do not use the set temperature restriction function in indoor units which are subject
to control.
If it is used, operation modes will be switched and the set temperature will be changed
repeatedly, possibly causing the air conditioners to break down.
(See P44 for how to set the set temperature restriction function.)
2.The following will happen if a communication error (the icon on the screen is blue)
occurs in the air conditioner being controlled.
2-1.Fixed air conditioner
If the main unit experiences a communication error, the automatic cooling / heating
switch group control will not happen.
2-2.Operating Air Conditioner Selection Method
Remove the air conditioner experiencing the communication error from selection
as the main unit, and select an air conditioner with normal communication.
2-3.Average Method
Remove the air conditioner experiencing the communication error from the
calculation for the average, and only use air conditioners with normal
communication for calculating the average.
3.Control which matches the main unit’s operation mode
(Control for when the operation mode of the main unit does not represent the
automatic cooling / heating switch group.)
It is possible that only the operation mode for the main unit is changed when control
using this function is done based on the main group unit (when the control method
is fixed air conditioner or operating air conditioner). The following control is
performed because it is possible that the operation mode of air conditioners other
than the main unit in the group might be in violation of the purpose of control and
not automatically switch if the conditions for implementing control using this function
are not satisfied.
[Example] Heating Mode-Matched Control
When the main unit is already operating in heating mode, whether or not the
conditions for implementing a switch from cooling to heating (main room temperature
< main set temperature – temperature difference) depends on the state
(environment) of the main unit. (If only the main unit is in heating operation, it is
possible that the room temperature might not rise because of the indoor units other
than the main unit which are in cooling operation, and the above control conditions
might not be satisfied.)
Therefore, only when control is performed based on the main group unit is the
control below performed depending on the operation mode of the main group unit.
Caution
Cooling Mode-Matched Control
Operation mode Set temperature
Operation mode Cooling / Automatic cooling
Temperature
Heating Mode-Matched Control
Operation mode
Set temperature
Operation mode
Heating / Automatic heating
Temperature
State of main unit (control conditions)
Heating main set temperature
State of main unit (control conditions)
Cooling main set temperature
Instructions to indoor units registered in the automatic
cooling / heating switch group
Instructions to indoor units registered in the automatic
cooling / heating switch group
Main room temperature <
main set temperature
Main room temperature <
main set temperature
73
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