Precautions For Indoor Unit - Mitsubishi Electric PQRY-P72TLMU-A Manual

14. INSTALLATION INFORMATION
14-1-7. Optional Accessories
• Only use accessories recommended by Mitsubishi Electric. Consult your local distributor or a qualified technician when installing
them. Improper installation by an unqualified person may result in water leakage, electric leakage, system breakdown, or fire.
• Some optional accessories may not be compatible with the air conditioning unit to be used or may not suitable for the installation
conditions. Check the compatibility when considering any accessories.
• Note that some optional accessories may affect the air conditioner's external form, appearance, weight, operating sound, and other
characteristics.
14-1-8. Operation/Maintenance
• Read the Instruction Book that is provided with each unit carefully prior to use.
• Maintenance or cleaning of each unit may be risky and require expertise. Read the Instruction Book to ensure safety.
Consult your local distributor or a qualified technician when special expertise is required such as when the indoor unit needs to be
cleaned.

14-2. Precautions for Indoor unit

14-2-1. Operating Environment
• The refrigerant (R410A) used for 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 should leak.
• If the units operate in the cooling mode at the humidity above 80%, condensation may collect and drip from the indoor units.
14-2-2. Unit characteristics
• The return air temperature display on the remote controller may differ from the ones 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 using a built-in temperature sensor on the remote controller may differ from the actual room temperature due to the
effect of the wall temperature.
• Use a 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 the places 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 the operation noise may
increase.
• The room temperature may rise over the preset temperature in the environment where the heating air conditioning load is small.
14-2-2. Unit Installation
• For simultaneous cooling/heating operation type air conditioners (R2, H2i R2, WR2 series), the G-type BC controller cannot be
connected to the P144 outdoor unit model or above, and the G- and GA-type BC controllers cannot be connected to the P264 model
or above. The GB- and HB-type BC controllers (sub) cannot be connected to the outdoor unit directly, and be sure to use them with
GA- and HA-type BC controllers (main).
• The insulation for low pressure pipe between the BC controller and outdoor unit shall be at least 20 mm 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 the demand control is used, abnormal stop of the unit or
damage of the electromagnetic contactor may occur. Consult your local distributor for details.
• When indoor units operate a fresh air intake, install a filter in the duct (field-supplied) to remove the dust from the air.
• The 4-way or 2-way Airflow Ceiling 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.
• Operating fresh air intake on the indoor unit may increase the sound pressure level.
WR2-148
PQRY-P-T(S)LMU, Y(S)LMU (April 2017 Ver2)
© 2017 Mitsubishi Electric US, Inc.