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7
Notes on operations and performance
Check before operation
• Turn on the power switch at least 12 hours before
starting operation.
• Make sure the earth wire is securely connected.
Defrosting during heating
• If frost falls on the outdoor unit during heating,
defrosting is automatically performed (for
approximately 2 - 10 minutes) to increase the
heating effect.
• The hot water module outputs the pump operation
during defrosting.
3-minute protection
The outdoor unit will not operate for approximately 3
minutes after the air conditioner (including hot water
module) has been immediately restarted after
stopping, or the power switch has been turned on. This
is to protect the system.
Power failure
• In the case of a power failure, all operations stop.
• To resume operations, push the ON/OFF button.
Protective device
(High pressure switch)
The high pressure switch stops the air conditioner
(including hot water module) automatically when
excessive load is applied to the air conditioner system.
If the protective device activates, the unit’s running
stops and the operation lamp blinks.
When the protective device activates, the
indicator
and the check code are displayed on the remote
controller.
The protective device may activate in the following
cases:
During cooling
• When the air intake or air discharge of the outdoor
unit is blocked.
• When strong wind blows continuously against the air
discharge of the outdoor unit.
During heating
• When dust or dirt is excessively adhered to the
strainer (locally procured) of water pipe.
• When the water flow rate is lower.
NOTE
When the protective device activates, turn off the
power switch, remove the cause, and then restart
running.
Cooling / Heating operations
Each unit can be controlled individually. However,
indoor units connected to the same outdoor unit cannot
perform cooling and heating simultaneously.
When you attempt simultaneous operation, hot water
module performing heating are stopped, and the
running preparation indicator
is displayed on the
remote controller.
An indoor unit performing cooling continues running.
When you attempt an operation without the configured
settings, the running preparation indicator
is
displayed on the remote controller and operation stops.
If operation is fixed to cooling or heating by the air
conditioner administrator, only the configured settings
apply to the operation.
Characteristics of heating
When the outside temperature increases, the outdoor
unit may stop.
8
Maintenance
WARNING
For daily maintenance, make
sure to ask the qualified
service person particularly
following models as the
maintenance requires high-
place work;
Cleaning the hot water
module and remote controller
• Ask qualified service person to clean the hot water
module for the models listed in the warning on the
top of this chapter.
• Wipe with a dry, soft cloth.
• Do not use benzine, thinner, scouring powder,
chemical cloth, etc. as those may cause deformation
or breakage.
If unused for over a month
• Before a long period of none use, purge the water
out of the pipes and thoroughly let them dry.
• Turn off the main power switch.
Periodic inspection
• After being used for a long period of time, the parts
may deteriorate or malfunction, or the drainage may
worsen, due to heat, moisture, dust, or general
usage.
• In addition to the maintenance, it is recommended
that you have a inspection (charges apply)
performed by the dealer where you purchased the
unit, etc.
Before the operating season
Ask a qualified service person to clean the drain
pan.
CAUTION
Clean the drain pan
Without cleaning, the drain pan
may be filled with waste, and
water may overflow onto the
floor.
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18-EN
