–11–
■Refrigerant piping
R32 refrigerant
• Incomplete flaring may cause refrigerant gas leakage.
• Do not re-use flares. Use new flares to prevent
refrigerant gas leakage.
• Use flare nuts that are included with the unit. Using
different flare nuts may cause refrigerant gas leakage.
Use the following item for the refrigerant piping.
Material : Seamless phosphorous deoxidized
copper pipe.
Dia.6.35, Dia.9.52, Dia.12.7 Wall thickness 0.8 mm
or more
Dia.15.88 Wall thickness 1.0 mm or more
When the refrigerant pipe is long, provide support
brackets at intervals of 2.5 to 3 m to clamp the refrigerant
pipe. Otherwise, abnormal sound may be generated.
4 Installation
conditions
■Before installation
Be sure to prepare to the following items before
installation.
Length of refrigerant pipe
* Caution during addition of refrigerant
Charge the refrigerant accurately. Overcharging
may cause serious trouble with the compressor.
• Do not connect a refrigerant pipe that is shorter than
3m.
This may cause a malfunction of the compressor or
other devices.
■Airtight test
1. Before starting an airtight test, further tighten the
spindle valves on the gas and liquid sides.
2. Pressurize the pipe with nitrogen gas charged from
the service port to the design pressure (4.15 MPa) to
conduct an airtight test.
3. After the airtight test is completed, evacuate the
nitrogen gas.
■Air purge
• To purge air, use a vacuum pump.
• Do not use refrigerant charged in the outdoor unit to
purge air. (The air purge refrigerant is not contained
in the outdoor unit.)
■Electrical wiring
• Be sure to fix the power wires and indoor / outdoor
connecting wires with clamps so that they do not
come to contact with the piping, sharp edges and the
cabinet, etc.
■Earthing
Make sure that proper earthing is provided.
Improper earthing may cause an electric shock. For
details on how to check earthing, contact the dealer who
installed the air conditioner or a professional installation
company.
• Proper earthing can prevent charging of electricity on
the outdoor unit surface due to the presence of a
high frequency in the frequency converter (inverter)
of the outdoor unit, as well as prevent electric shock.
If the outdoor unit is not properly earthed, you may
be exposed to an electric shock.
• Be sure to connect the earth wire. (Grounding
work)
Incomplete earthing can cause an electric shock. Do
not connect earth wires to gas pipes, water pipes,
lightning rods or earth wires for telephone wires.
■Test run
Turn on the leakage breaker at least 12 hours before
starting a test run to protect the compressor during
startup.
Incorrect installation work may result in a malfunction or
complaints from customers.
Length of refrigerant pipe
connected to indoor/
outdoor unit
Item
3 to 50 m
An additional amount of
refrigerant may be required
depending on the length of
the piping. For details, refer
to “To charge additional
refrigerant” on page 19.
21-EN 22-EN
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