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1. Installation information
1-2. Precautions for Indoor unit and BC controller
1-2-1. Operating environment
The refrigerant (R410A) used in the air conditioner is non-toxic and nonflammable. However, if the refrigerant leaks, the
oxygen level may drop to harmful levels. If the air conditioner is installed in a small room, measures must be taken to
prevent the refrigerant concentration from exceeding the safety limit even if the refrigerant leaks.
If the units operate in cooling mode at a humidity above 80%, condensation may collect and drip from the indoor units.
Regular checking and cleaning of the drain drainage paths, such as the drain pan or the drain pump, is recommended
to prevent clogging. The neglect of a clogged drain pump may trigger the water-leakage protection function which stops
operation of the entire system.
1-2-2. Unit characteristics
The return air temperature display on the remote controller may differ from the displays on the other thermometers.
The clock on the remote controller may be displayed with a time lag of approximately one minute every month.
The temperature measured by the built-in temperature sensor on the remote controller may differ from the actual room
temperature due to the effect of the wall temperature.
Use the built-in thermostat on the remote controller or a separately-sold thermostat when indoor units installed on or in
the ceiling operate the automatic cooling/heating switchover.
The room temperature may rise drastically due to Thermo OFF in areas where the air-conditioning load is large, such
as computer rooms.
Be sure to use a regular filter. If an irregular filter is installed, the unit may not operate properly, and operating noise may
increase.
The room temperature may increase above the preset temperature in environments in which the heating or
air-conditioning load is small.
1-2-3. Unit installation
The insulation for the low-pressure pipe between the BC controller and the outdoor/heat source unit must be at least 20
mm (13/16 in.) thick. If the unit is installed on the top floor or in a high-temperature, high-humidity environment, thicker
insulation may be necessary.
Do not have any branching points on the downstream of the refrigerant pipe header.
When a field-supplied external thermistor is installed or when a device for demand control is used, the unit may stop
abnormally or damage may occur to the electromagnetic contactor. Consult your local distributor for details.
When indoor units employ fresh air intake, install a filter in the duct (locally procured) to remove dust from the air.
The 4-way Cassette Type units that have an outside air inlet can be connected to the duct, but need a booster fan to be
installed at site. Refer to the chapter "Indoor Unit" for the available range for fresh air intake volume.
Employing fresh air intake for the indoor unit may increase the sound pressure level.
Do not install the unit above the cooking or food processing area.
1-2-4. Noise level (Sound pressure level)
The sound pressure level is a value measured in an anechoic room in accordance with the conventional method in JIS
standard. The sound pressure level actually measured at the installation site is usually higher than the value indicated
in this DATA BOOK due to the influence of ambient noise and echoes.
MEES20K084
Installation information
4
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