Operation manual
7
HXHD125A7V1B
VRVIII system air conditioner
4PW62583-1 – 11.2010
8.
M
AINTENANCE
8.1.
Maintenance after a long stop period
(e.g. at the
beginning of the season)
■
Check and remove everything that might be blocking inlet and
outlet vents of indoor units and outdoor units.
■
Clean air filters and casings of indoor units. Refer to the
operation manual supplied with the indoor units for details on
how to proceed and make sure to install cleaned air filters back
in the same position.
■
Turn on the power at least 6 hours before operating the unit in
order to ensure smoother operation. As soon as the power is
turned on, the remote controller display appears.
8.2.
Maintenance before a long stop period
(e.g. at the
end of the season)
■
Let the indoor units run in fan only operation for about half a day
in order to dry the interior of the units. Refer to
"6.1. Cooling,
heating, fan only, and automatic operation" on page 4
for details
on fan only operation.
■
Turn off the power. The remote controller display disappears.
■
Clean air filters and casings of indoor units. Refer to the
operation manual supplied with the indoor units for details on
how to proceed and make sure to install cleaned air filters back
in the same position.
9.
F
OLLOWING
SYMPTOMS
ARE
NOT
AIR
CONDITIONER
TROUBLES
Symptom 1: The system does not operate
■
The air conditioner does not start immediately after the ON/OFF
button on the remote controller is pressed.
If the operation lamp lights, the system is in normal condition.
To prevent overloading of the compressor motor, the air
conditioner starts 5 minutes after it is turned ON again in case it
was turned OFF just before. The same starting delay occurs
after the operation mode selector button was used.
■
If "Centralized Control" is displayed on the remote control and
pressing the operation button causes the display to blink for a
few seconds indicating that the central device is controlling the
unit.
The blinking display indicates that the remote control cannot be
used.
■
The system does not start immediately after the power supply is
turned on.
Wait one minute until the micro computer is prepared for
operation.
Symptom 2: Cool/Heat cannot be changed over
■
When the display shows "
" (change-over under
centralized control), it shows that this is a slave remote
controller.
■
When the cool/heat changeover remote control switch is
installed and the display shows "
" (change-over under
centralized control).
This is because cool/heat changeover is controlled by the cool/
heat changeover remote control switch. Ask your dealer where
the remote control switch is installed.
Symptom 3: Fan operation is possible, but cooling and heating do not
work.
■
Immediately after the power is turned on.
The micro computer is getting ready to operate. Wait 12 minutes.
Symptom 4: The fan strength does not correspond to the setting.
■
The fan strength does not change even if the fan strength
adjustment button in pressed.
During heating operation, when the room temperature reaches
the set temperature, the outdoor unit goes off and the indoor unit
changes to whisper fan strength.
This is to prevent cold air blowing directly on occupants of the
room.
The fan strength will not change even if the button is pressed,
when another indoor unit is in heating operation.
Symptom 5: The fan direction does not correspond to the setting
■
The fan direction does not correspond to the remote control
display. The fan direction does not swing.
This is because the unit is being controlled by the micro
computer.
Symptom 6: White mist comes out of a unit
Symptom 6.1: Indoor unit
■
When humidity is high during cooling operation
If the interior of an indoor unit is extremely contaminated, the
temperature distribution inside a room becomes uneven. It is
necessary to clean the interior of the indoor unit. Ask your dealer
for details on cleaning the unit. This operation requires a
qualified service person.
■
Immediately after the cooling operation stops and if the room
temperature and humidity are low.
This is because warm refrigerant gas flows back into the indoor
unit and generates steam.
CAUTION
Pay attention to the fan.
It is dangerous to inspect the unit while the fan is running.
Be sure to turn off the main switch and to remove the fuses
from the control circuit located in the outdoor unit.
