Mitsubishi Electric PUHZ-SW AA Série Manuel D'installation page 4

1. Safety precautions
1.2. Before installation (relocation)
Caution:
• Be extremely careful when transporting or install-
ing the units. Two or more persons are needed to
handle the unit, as it weighs 20 kg or more. Do not
grasp the packaging bands. Wear protective gloves
to remove the unit from the packaging and to move
it, as you can injure your hands on the fins or the
edge of other parts.
• Be sure to safely dispose of the packaging mate-
rials. Packaging materials, such as nails and other
metal or wooden parts may cause stabs or other in-
juries.
1.3. Before electric work
Caution:
• Be sure to install circuit breakers. If not installed,
electric shock may result.
• For the power lines, use standard cables of suffi-
cient capacity. Otherwise, a short circuit, overheat-
ing, or fire may result.
• When installing the power lines, do not apply ten-
sion to the cables. If the connections are loosened,
the cables can snap or break and overheating or fire
may result.
1.4. Using R410A refrigerant outdoor units
Caution:
• Use C1220 copper phosphorus, for copper and cop-
per alloy seamless pipes, to connect the refrigerant
pipes. Make sure the insides of the pipes are clean
and do not contain any harmful contaminants such
as sulfuric compounds, oxidants, debris, or dust.
Use pipes with the specified thickness. (Refer to
4.1.) Note the following if reusing existing pipes that
carried R22 refrigerant.
- Replace the existing flare nuts and flare the flared sec-
tions again.
- Do not use thin pipes. (Refer to 4.1.)
• Store the pipes to be used during installation in-
doors and keep both ends of the pipes sealed until
just before brazing. (Leave elbow joints, etc. in their
packaging.) If dust, debris, or moisture enters the
refrigerant lines, oil deterioration or compressor
breakdown may result.
• Use ester oil, ether oil, alkylbenzene oil (small
amount) as the refrigeration oil applied to the flared
sections. If mineral oil is mixed in the refrigeration
oil, oil deterioration may result.
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• The base and attachments of the outdoor unit must
be periodically checked for looseness, cracks or
other damage. If such defects are left uncorrected,
the unit may fall down and cause damage or inju-
ries.
• Do not clean the outdoor unit with water. Electric
shock may result.
• Tighten all flare nuts to specification using a torque
wrench. If tightened too much, the flare nut can
break after an extended period and refrigerant can
leak out.
• Be sure to ground the unit. Do not connect the
ground wire to gas or water pipes, lightning rods, or
telephone grounding lines. If the unit is not properly
grounded, electric shock may result.
• Use circuit breakers (ground fault interrupter, iso-
lating switch (+B fuse), and molded case circuit
breaker) with the specified capacity. If the circuit
breaker capacity is larger than the specified capac-
ity, breakdown or fire may result.
• Do not use refrigerant other than R410A refrigerant.
If another refrigerant is used, the chlorine will cause
the oil to deteriorate.
• Use the following tools specifically designed for
use with R410A refrigerant. The following tools are
necessary to use R410A refrigerant. Contact your
nearest dealer for any questions.
Tools (for R410A)
Gauge manifold
Charge hose
Gas leak detector
Torque wrench
• Be sure to use the correct tools. If dust, debris, or
moisture enters the refrigerant lines, refrigeration oil
deterioration may result.
• Do not use a charging cylinder. If a charging cylin-
der is used, the composition of the refrigerant will
change and the efficiency will be lowered.
Flare tool
Size adjustment gauge
Vacuum pump adapter
Electronic refrigerant charg-
ing scale