Before Installation - Mitsubishi Electric PUHZ-W AA Série Manuel D'installation

1. Safety precautions
• All electric work must be performed by a qualified
technician according to local regulations and the
instructions given in this manual. The units must be
powered by dedicated power lines and the correct
voltage and circuit breakers must be used. Power
lines with insufficient capacity or incorrect electri-
cal work may result in electric shock or fire.
• Use C1220 copper phosphorus, for copper and cop-
per alloy seamless pipes, to connect the refriger-
ant pipes. If the pipes are not connected correctly,
the unit will not be properly grounded and electric
shock may result.
• Use only specified cables for wiring. The wiring
connections must be made securely with no ten-
sion applied on the terminal connections. Also,
never splice the cables for wiring (unless otherwise
indicated in this document).
Failure to observe these instructions may result in
overheating or a fire.
• The terminal block cover panel of the outdoor unit
must be firmly attached. If the cover panel is mount-
ed incorrectly and dust and moisture enter the unit,
electric shock or fire may result.
• When installing or relocating, or servicing the out-
door unit, use only the specified refrigerant (R410A)
to charge the refrigerant lines. Do not mix it with any
other refrigerant and do not allow air to remain in
the lines.
If air is mixed with the refrigerant, then it can be the
cause of abnormal high pressure in the refrigerant
line, and may result in an explosion and other haz-
ards.

1.1. Before installation

Caution:
• Do not use the unit in an unusual environment. If the
outdoor unit is installed in areas exposed to steam,
volatile oil (including machine oil), or sulfuric gas,
areas exposed to high salt content such as the
seaside, or areas where the unit will be covered by
snow, the performance can be significantly reduced
and the internal parts can be damaged.
• Do not install the unit where combustible gases
may leak, be produced, flow, or accumulate. If com-
bustible gas accumulates around the unit, fire or
explosion may result.
• The outdoor unit produces condensation during
the heating operation. Make sure to provide drain-
age around the outdoor unit if such condensation is
likely to cause damage.
• Remove the compressor's fixing component in ac-
cordance with the NOTICE attached to the unit. Run-
ning the unit with the fixing component mounted
will result in increased noise.
The use of any refrigerant other than that speci-
fied for the system will cause mechanical failure or
system malfunction or unit breakdown. In the worst
case, this could lead to a serious impediment to se-
curing product safety.
• Use only accessories authorized by Mitsubishi
Electric and ask a dealer or an authorized techni-
cian to install them. If accessories are incorrectly
installed, water leakage, electric shock, or fire may
result.
• Do not alter the unit. Consult a dealer for repairs. If
alterations or repairs are not performed correctly,
water leakage, electric shock, or fire may result.
• The user should never attempt to repair the unit or
transfer it to another location. If the unit is installed
incorrectly, water leakage, electric shock, or fire
may result. If the outdoor unit must be repaired or
moved, ask a dealer or an authorized technician.
• After installation has been completed, check for
refrigerant leaks. If refrigerant leaks into the room
and comes into contact with the flame of a heater
or portable cooking range, poisonous gases will be
released.
• When installing the unit in a hospital or communi-
cations office, be prepared for noise and electronic
interference. Inverters, home appliances, high-
frequency medical equipment, and radio commu-
nications equipment can cause the outdoor unit to
malfunction or breakdown. The outdoor unit may
also affect medical equipment, disturbing medical
care, and communications equipment, harming the
screen display quality.
• When the unit is running, vibrations or the noise of
refrigerant running may be heard from the exten-
sion piping. Try to avoid installing the piping to thin
walls, etc. as much as possible and provide sound
insulation with the piping cover, etc.
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