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6-1-2 NIGHT QUIET mode (Available only for COOL
operation)
NIGHT QUIET mode requires initial programming during
installation. Please consult your retailer or dealer for assistance.
NIGHT QUIET mode reduces the operation noise of the
outdoor unit during the night-time hours to prevent annoyance
to neighbours.
• NIGHT QUIET mode is activated when the temperature
drops 6°C or more below the highest temperature recorded
that day.
When the temperature difference between the current
outdoor temperature and the maximum outdoor temperature
becomes less than 4°C, this function will be cancelled.
• NIGHT QUIET mode slightly reduces the cooling efficiency
of the unit.
6-1-3 OUTDOOR UNIT QUIET operation
Refer to "OUTDOOR UNIT QUIET Operation" on page 10.
When the priority room setting is active but the set unit is
not operating or when the priority room setting is inactive
When using the OUTDOOR UNIT QUIET operation feature with
a multi system, set all indoor units to OUTDOOR UNIT QUIET
operation using their remote controllers.
When cancelling OUTDOOR UNIT QUIET operation, simply
cancel the mode on one of the operating indoor units using their
remote controller.
However OUTDOOR UNIT QUIET operation will remain
displayed on the remote controllers for the other rooms.
We recommend you cancel operation in all rooms using their
remote controllers.
With the priority room setting active
Refer to "6-1-5 Priority room setting".
6-1-4 COOL/HEAT mode lock
The COOL/HEAT mode lock requires initial programming
during installation. Please consult your authorized dealer for
assistance. The COOL/HEAT mode lock sets the unit forcibly
to either COOL or HEAT operation. This function is convenient
when you wish to set all indoor units connected to the multi
system to the same operation mode.
Note:
• The COOL/HEAT mode lock cannot be activated together
with the priority room setting.
6-1-5 Priority room setting (Not available on some models)
The priority room setting requires initial programming
during installation. Please consult your authorized dealer for
assistance.
The room designated as the priority room takes priority in the
following situations.
Operation mode priority
• As the operation mode of the priority room takes
precedence, you can select a different operation mode from
other rooms.
[Example]
• Room A is the priority room in this example.
When COOL operation is selected in room A while operating
the following modes in room B, C and D:
17
Operation mode in
room B, C and D
COOL or DRY or FAN
HEAT
AUTO
Priority when POWERFUL operation is used
[Example]
• Room A is the priority room in this example.
The indoor units in rooms A, B, C and D are all operating.
If the unit in room A enters POWERFUL operation, operation
capacity will be concentrated in room A. In such a case,
the cooling (heating) efficiency of the units in room B, C and
D may be slightly reduced.
Priority when OUTDOOR UNIT QUIET operation is used
[Example]
• Room A is the priority room in this example.
Just by setting the unit in room A to QUIET operation, the air
conditioner starts OUTDOOR UNIT QUIET operation.
You do not have to set all the indoor units in operation to
OUTDOOR UNIT QUIET operation.
7. Maintenance and service
7-1 Overview: Maintenance and service
The installer has to perform yearly maintenance.
WARNING
• The refrigerant inside the unit is mildly flammable, but normally
does NOT leak. If the refrigerant leaks in the room and comes
in contact with fire from a burner, a heater, or a cooker, this
may result in fire, or the formation of a harmful gas.
• Turn off any combustible heating devices, ventilate the room,
and contact the dealer where you purchased the unit.
• Do NOT use the unit until a service person confirms that the
part from which the refrigerant leaked has been repaired.
• Do NOT pierce or burn refrigerant cycle parts.
• Do NOT use cleaning materials or means to accelerate the
defrosting process other than those recommended by the
manufacturer.
• Be aware that the refrigerant inside the system is odourless.
• The appliance shall be stored in a room without continuously
operating ignition sources (example: open flames, an
operating gas appliance or an operating electric heater).
Status of room B, C and D when
the unit in room A is in COOL
operation
The current operation mode is
maintained.
The unit enters the standby mode.
Operation resumes when the room
A unit stops operating.
If the unit is set to COOL
operation, it continues. If the unit
is set to HEAT operation, it enters
the standby mode. Operation
resumes when the room A unit
stops operating.
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Troubleshooting
