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12-EN
11-EN
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Refrigerant piping
New refrigerant (R410A)
When using the conventional piping
• When using the conventional piping with no indication of applicable refrigerant types, be sure to use it with a wall
thickness of 0.8 mm for Ø6.4 mm, Ø9.5 mm, and Ø12.7 mm.
Do not use the conventional piping kit with a wall thickness less than these thicknesses due to insuf
fi
cient
pressure capacity.
When using general copper pipes
• Use general copper pipes with a wall thickness of 0.8 mm for Ø6.4 mm, Ø9.5 mm, and Ø12.7 mm.
Do not use any copper pipes with a wall thickness less than these thicknesses.
Flare nuts and flare machining
• The
fl
are nuts and
fl
are machining are different from those for the conventional refrigerant.
Use the flare nuts supplied with the air conditioner or those for R410A.
• Before performing
fl
are machining, carefully read “Refrigerant piping”.
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Before installation
Be sure to prepare to the following items before
installation.
Length of refrigerant pipe
<SM30, SM40>
Length of refrigerant pipe
connected to indoor /
outdoor unit
Item
2 to 15 m
Addition of refrigerant is
unnecessary at the local site.
*16 to 20 m
<Addition of refrigerant>
Add 20 g of refrigerant for
every 1 m of piping that
exceeds 15 m.
*
Caution during addition of refrigerant.
When the total length of refrigerant piping exceeds
15 m, add 20 g/m of refrigerant up to a maximum
total length of piping at 20 m. (Max. amount of
additional refrigerant is 100 g.)
Charge the refrigerant accurately. Overcharging
may cause serious trouble with the compressor.
• Do not connect a refrigerant pipe that is shorter than
2 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 (4.15 Mpa) to
conduct an airtight test.
3. Check for gas leaks using a leak tester for the HFC
refrigerant.
4. 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
fi
x the power wires and system
interconnection 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.
• 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 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.
4
Installation
conditions
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