The Smart Way To Use; Caring For The Machine; Troubleshooting - Mitsubishi Electric City Multi PEFY-WP.VMS1-E serie Bedienungshandbuch

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 impor-
tant to clean the filter at the beginning of the cooling and heating seasons. (When
profuse dust and dirt have accumulated, 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.
• Indoor units are equipped with filters to remove the dust of sucked-in air.
Clean the filters following the procedures on the right. (The standard filter
should normally be cleaned once a week, and the long-life filter at the begin-
ning of each season.)
• The life of the filter depends on where the unit is installed and how it is oper-
ated.

6. Troubleshooting

Before you ask for repair service, check the following points:
State of Machine Remote Controller
" " display is not lit up.
No display appears even
It does not run.
when the [ON/OFF] but-
ton is pressed.
Air flows out but it does The liquid crystal display
not cool enough or shows that it is in the
heat enough. state of operation.
The liquid crystal display
Cool air or warm air
shows that it is in opera-
does not come out.
tion.
The "CHECK" and check
It runs briefly, but soon
code flashes on the liquid
stops.
crystal display.
The sound of the
exhaust and rotation of All lights are out except
the motor can still be the powered display of
heard after stop of run- " ".
ning.
The sound of the
exhaust and the rota- All lights are out except
tion of the motor can the powered display of
be heard intermittently " ".
after stop of running.
Warm air comes out
The liquid crystal display
intermittently when the
shows that it is in the
thermostat is OFF or
state of operation.
during fan operation.
• If operation stops due to a power failure, the [restart-preventing circuit at power failure] operates and disables unit operation even after power restoration. In this case, press
the [ON/OFF] button again and start operation.
Prevent intrusion of heat during air-cooling
• To prevent the intrusion of heat during cooling operation, provide a curtain or a
Carry out ventilation sometimes
• Since the air periodically gets dirty in a room that is kept closed for a long time,
How to clean
• Clear dust away lightly or clean it up with a vacuum cleaner. In the case of severe
• Do not dry the filter by exposing it to direct sunlight or warming it using fire,
• Washing it in hot water (more than 50 °C) can also result in deformation.
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.
Cause
Power failure
The power supply is turned OFF.
The fuse in the power supply is gone.
The earth leakage breaker is gone.
Improper temperature adjustment
The filter is filled with dust and dirt.
There are some obstacles at the air inlet and outlet of the
indoor and outdoor units.
Windows and doors are open.
The restart-preventing circuit is in operation for 3 minutes.
Indoor unit operation was restarted during the heating and
defrosting operation.
There are some obstacles at the air inlet and outlet of the
indoor and outdoor units.
The filter is filled with dust and dirt.
When other indoor units are engaged in cooling operation,
the machine stops after running a drain-up mechanism for
3 minutes when air-cooling operation is stopped.
When other indoor units are engaged in cooling operation,
drained water is brought in. If the drain water is collected,
the drain-up mechanism initiates a draining operation.
When other indoor units are engaged in heating opera-
tion, the control valves are opened and closed from time
to time to maintain the stability of the system.
blind on the window to block out direct sunlight. Also, do not open the entrance or
exit except in cases of dire necessity.
ventilation is sometimes necessary. When gas appliances are used together with
the air conditioner, special precautions must be taken. If the "LOSSNAY" ventila-
tion unit developed by our company is used, you can perform ventilation with less
waste. For details on this unit, consult with your dealer.
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:
etc. Doing so can result in the deformation of the filter.
Caution:
Press the [ON/OFF] button after power restoration.
Turn the power supply ON.
Replace fuse.
Put in the earth leakage breaker.
After checking the set temperature and inlet temperature
on the liquid crystal display, operate the adjustment button.
Clean up the filter.
(Refer to [Caring for the machine].)
Remove.
Close.
Wait for a while.
(To protect the compressor, a 3-minute restart-preventing
circuit is built into the indoor unit. Therefore, there are occa-
sions sometimes when the compressor does not start run-
ning immediately. There are cases when it does not run for
as long as 3 minutes.)
Wait for a while.
(Heating operation starts after ending defrosting operation.)
Rerun after removal
Rerun after cleaning the filter. (Refer to [Caring for the
machine].)
Wait for 3 minutes.
It soon stops. (If the noise occurs more than 2-3 times in an
hour, ask for repair service.)
It soon stops. (If the room temperature rises uncomfortably
high in a small room, stop operation.)
Troubleshooting
5