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7. Caring for the unit
Always have filter maintenance performed by a service person.
Before care-taking, turn the power supply OFF.
Caution:
•Before you start cleaning, stop operation and turn OFF the power supply.
Remember that the fan is rotating inside at high speed, posing a serious
risk of injury.
•Indoor units are equipped with filters to remove the dust of sucked-in air.
Clean the filters using the methods shown in the following sketches. (The
standard filter should normally be cleaned once a week, and the long-life
filter at the beginning of each season.)
•The life of the filter depends on where the unit is installed and how it is
operated.

How to clean

•Clear dust away lightly or clean it up with a vacuum cleaner. In the case of
severe staining, wash the filter in lukewarm water mixed with dissolved neutral
detergent or water, and then rinse off the detergent completely. After washing,
dry it and fix it back into place.
Caution:
•Do not dry the filter by exposing it to direct sunlight or warming it using
fire, etc. Doing so can result in the deformation of the filter.
•Washing it in hot water (more than 50 °C) can also result in deformation.
Caution:
Never pour water or flammable sprays onto the unit. Cleaning using these
methods can result in the failure of the unit, electric shock, or fire.
6. The smart way to use
Even minimal steps to care for your unit can help make its use far more
effective in terms of air-conditioning effect, electricity charges, etc.

Clean the filter thoroughly

•If the screen of the air filter becomes clogged, the airflow and air-conditioning
effect can be significantly reduced.
Further, if the condition is left unattended, failure can result. It is particularly
important to clean the filter at the beginning of the cooling and heating sea-
sons. (When profuse dust and dirt have accumulated, clean the filter thor-
oughly.)

Prevent intrusion of heat during air-cooling

•To prevent the intrusion of heat during cooling operation, provide a curtain or a
blind on the window to block out direct sunlight. Also, do not open the entrance
or exit except in cases of dire necessity.

Carry out ventilation sometimes

•Since the air periodically gets dirty in a room that is kept closed for a long time,
ventilation is sometimes necessary. When gas appliances are used together
with the unit, special precautions must be taken. If the “LOSSNAY” ventilation
unit developed by our company is used, you can perform ventilation with less
waste. For details on this unit, consult with your dealer.

3.6. Selecting Normal and Local Operation

Selecting Local operation
Set the Normal/Local switch C to local.
Start and stop is only possible with the remote controller (remote ON/OFF input
disabled) when Local is selected, and faults occurring during checks are not dis-
played with remote output.

3.7. Fault Reset

Reset when a fault display lamp is lit
Press the ON/OFF button B.
The unit stops and the fault is reset.
* When repairs by the retailer or a specialist technician are complete, ensure
that the unit is safe, and reset. The customer should not engage in repairs.
Caution:
•The unit cannot be stopped in the Normal mode. Select the Local opera-
tion mode and press the switch on the remote controller. Note that if the
SW 1 - 10 on the indoor unit control board are ON (ie remote ON/OFF
input not used) ON/OFF is also possible from the remote controller in the
Normal mode.
5. Control of Indoor Unit Inlet or Outlet Temperature4. “Failure” Display Lamps
PFD-P250VM-A * If both the “Operating” and “Failure” lamps are lit, either a fault has developed
in the unit and it has stopped operating, or it is operating in the emergency
mode.
Note the unit number and error code appearing on the panel, and contact your
serviceman.
* A refrigerant system is operating normally if the associated fault display lamps
are extinguished.
Either of the above methods of temperature control may be selected with this model.
The method of control is selected with the switch SWC on the address board in-
side the indoor unit controller shown in the Fig. A.
When the unit is shipped from the factory it is set to outlet temperature control
(SWC set to ‘Standard’).
Change the method of control by setting SWC on the address board inside the
controller as follows.
Inlet temperature control: Set to “Option”.
Outlet temperature control: Set to “Standard”.
•Remote ON/OFF input and ON/OFF from the central controller (optional)
are disabled in the Local operation mode.
•See the central controller users manual for details of ON/OFF from the
central controller (optional) and input of temperature settings.
•Selecting ON/OFF from the remote controller requires a few seconds.
This is not a fault.
•Following reset after a power failure, the unit begins operation again au-
tomatically, and ‘HO’ appears on the MA remote controller display after
an interval of approximately 15 seconds. The MA remote controller can-
not be used during this interval. Turn power OFF with the earth leakage
breaker to stop the unit in an emergency.

3.8. Others

CENTRALLY CONTROLLED
:Displayed when control is executed by a separately
sold centralized control unit, etc.
CHECK
:This displays indication when some abnormality oc-
curs in the unit.
NOT AVAILABLE
:When a button is pressed for any function which the
indoor unit cannot perform, this display flashes con-
currently with the display of that function.
[Fig. A] (P.4)
AAddress board BControl board
CAddress board DOption: Inlet temperature control
EStandard: Outlet temperature control
Operating
Power
Check No.1
Failure
No.2
Failure
The diagram at left shows an example of a fault in
a refrigerant system.
Operating
Power
Check Failure
PFD-P500VM-A