Others; The Smart Way To Use; Caring For The Machine; Troubleshooting - Mitsubishi Electric PRH-P8 Operation Manual

3.7. Others

: Displayed when control is executed by a separately
CENTRALLY CONTROLLED
sold centralized control unit, etc.
STAND BY
: Displayed from the start of heating operation until the
DEFROST
moment warm air blows out.
: This displays indication when some abnormality oc-
CHECK
curs in the unit.
: When a button is pressed for any function which the
NOT AVAILABLE
indoor unit cannot perform, this display flashes con-
currently with the display of that function.

4. The smart way to use

Even minimal steps to care for your air conditioner can help make its use far
more effective in terms of air-conditioning effect, electricity charges, etc.
Set the right room temperature
• In cooling operation, a temperature difference of about 5°C between indoors
and outdoors is optimum.
• If the room temperature is raised by 1°C during air-cooling operation, about 10%
electric power can be saved.
• Excessive cooling is bad for health. It also results in the waste of electric power.
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 seasons. (When profuse dust and dirt have accu-
mulated, clean the filter thoroughly.)

5. Caring for the machine

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.
• Clean the filter installed in the field once a week (more a dusty place).
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.

6. Troubleshooting

Before you call out a repair man, check the following table to see whether there is
a simple solution to your problem.
G Unit does not cool or heat very well.
• Clean the filter. (Dust and debris that collects in the filter will decrease air-
flow.)
• Check the temperature setting and adjust it if necessary.
• Increase the space surrounding the unit.
Is the air intake or air outlet blocked?
• Is a window or door open?
G The unit does not blow air out right away in the heating mode.
• The unit is preparing to deliver warm air.
G The unit stops operating before arriving at the set temperature in the
heating mode.
• Frost forms when the outdoor temperature is low and humidity is high. Wait
for about 10 minutes for the frost to melt.
G There is a "swishing" noise that occurs from the unit when water flows.
• This sound is made when refrigerant inside of the unit is flowing or refilling.
G A ticking noise is heard from inside of the unit.
• This sound is made when internal parts of the unit expand or contract when
the temperature changes.
: In the system in which the [Sensor] display is indi-
cated as the "remote controller", room temperature
measurement is performed by the room temperature
sensor built into the remote controller. Therefore, pay
attention to the following:
: Displayed when it is time to clean the filter.
FILTER
Press the A [Filter] button twice, then the display is
disappeared.
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 air conditioner, 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.
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
Caution:
Never pour water or flammable sprays onto the air conditioner. Cleaning using
these methods can result in the failure of the air conditioner, electric shock,
or fire.
G An odor is detected in the room.
• This is caused when the unit expels odors that have been absorbed from the
walls, carpets, furniture or clothing.
G A white mist is expelled from the air outlet part.
• This may occur just after the unit is turned on when a high level of humidity is
present in the room.
G Water or moisture is expelled from the unit.
• This occurs to expel water or moisture that may have collected in the pipes
or around piping fixtures.
• This occurs to dispel water from the heat exchanger.
G The indicators of the remote controller do not light up when operated.
• Turn on the power switch. " · " will be displayed.
G CENTRALLY CONTROLLED is displayed in the remote controller.
• The start and stop functions of the remote controller are not available when
the CENTRALLY CONTROLLED message is lit.
G The start and stop functions are not available just after restarting the
unit.
• Wait about three minutes (operation has stopped to prevent damage to the
air conditioner).
°
C) can also result in deformation.
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