20-EN
19-EN
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EN
4
Installation conditions
Before installation
Be sure to prepare to the following items before
installation.
Length of refrigerant pipe
Length of refrigerant pipe connected to
Indoor / Outdoor unit
5 to 30 m
y
Do not connect a refrigerant pipe that is shorter than
5 m
.
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 (4.29 MPa)
to conduct an airtight test.
3. After the airtight test is completed, evacuate the
nitrogen gas.
Air purge
y
To purge air, use a vacuum pump.
y
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
y
Be sure to
fi
x the power wires and Indoor / Outdoor
connecting wires with clamps so that they do not
come into contact with the cabinet, etc.
Earthing
WARNING
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.
y
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.
y
Be sure to connect the earth wire. (grounding
work)
Incomplete grounding can cause an electric shock.
Do not connect ground wires to gas pipes, water
pipes, lightning rods or ground 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.
CAUTION
Incorrect installation work may result in a malfunction
or complaints from customers.
Bender
Bending pipes
Conventional tools (R410A)
Refrigerant recovery equipment
Refrigerant recovery
Conventional tools (R32 or R410A)
Torque wrench
Tightening
fl
are nuts
Conventional tools (R410A)
Pipe cutter
Cutting pipes
Conventional tools (R410A)
Refrigerant cylinder
Charging refrigerant
Prepared newly (Use for R32 only)
Welding machine and nitrogen
cylinder
Welding pipes
Conventional tools (R410A)
Electronic refrigerant charging
scale
Charging refrigerant
Conventional tools (R32 or R410A)
Refrigerant piping
R32 refrigerant
CAUTION
y
Incomplete
fl
aring may cause refrigerant gas leakage.
y
Do not re-use
fl
ares. Use new
fl
ares to prevent refrigerant gas leakage.
y
Use
fl
are nuts that are included with the unit. Using different
fl
are nuts may cause refrigerant gas leakage.
Use the following item for the refrigerant piping.
Material : Seamless phosphorous deoxidized copper pipe.
Ø9.52 Wall thickness 0.8 mm or more
Ø15.88 Wall thickness 1.0 mm or more
REQUIREMENT
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.
