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8
EARTHING
WARNING
• Be sure to connect the earth wire. (grounding work)
Incomplete grounding may cause an electric shock.
Connect the earth line properly following applicable technical standards.
Connecting the earth line is essential to preventing electric shock and to reducing noise and electrical charges on the
outdoor unit surface due to the high-frequency wave generated by the frequency converter (inverter) in the outdoor
unit.
If you touch the charged outdoor unit without an earth line, you may experience an electric shock.
9
FINISHING
After the refrigerant pipe, inter-unit wires, and drain pipe have been connected, cover them with finishing
tape and clamp them to the wall with off-the-shelf support brackets or their equivalent.
Keep the power wires and indoor/outdoor connecting wires off the valve on the gas side or pipes that have no heat
insulator.
10
TEST RUN
• Turn on the leakage breaker at least 12 hours before starting a test run to protect the compressor during
startup.
To protect the compressor, power is supplied from the 220-240 VAC input to the unit to preheat the compressor.
• Check the following before starting a test run:
• That all pipes are connected securely without leaks.
• That the valve is open.
If the compressor is operated with the valve closed, the outdoor unit will become overpressurized, which may
damage the compressor or other components.
If there is a leak at a connection, air can be sucked in and the internal pressure further increases, which may cause
a burst or injury.
• Operate the air conditioner in the correct procedure as specified in the Owner's Manual.
EN-27
11
FUNCTIONS TO BE IMPLEMENTED LOCALLY
Handling Existing Pipe
When using the existing pipe, carefully check for the
following:
• Wall thickness (within the specified range)
• Scratches and dents
• Water, oil, dirt, or dust in the pipe
• Flare looseness and leakage from welds
• Deterioration of copper pipe and heat insulator
Cautions for using existing pipe
• Do not reuse a flare nut to prevent gas leaks.
Replace it with the supplied flare nut and then process
it to a flare.
• Blow nitrogen gas or use an appropriate means to
keep the inside of the pipe clean. If discolored oil or
much residue is discharged, wash the pipe.
• Check welds, if any, on the pipe for gas leaks.
When the pipe corresponds to any of the following, do
not use it. Install a new pipe instead.
• The pipe has been opened (disconnected from indoor
unit or outdoor unit) for a long period.
• The pipe has been connected to an outdoor unit that
does not use refrigerant R22, R410A or R407C.
• The existing pipe must have a wall thickness equal to
or larger than the following thicknesses.
Reference outside
Wall thickness (mm)
diameter (mm)
Ø6.4
Ø12.7
• Do not use any pipe with a wall thickness less than
these thicknesses due to insufficient pressure
capacity.
Recovering Refrigerant
• When recovering refrigerant during reinstallation of the
indoor or outdoor unit, etc., use the refrigerant
recovery switch on the terminal block of the outdoor
unit.
- 14 -
Procedure
1.
Start cooling operation for a while, and then stop the
operation.
2.
Turn on the power supply.
3.
Using the remote controller, set the indoor unit to
FAN operation.
4.
Push the refrigerant recovery switch for 2 seconds
or more on the terminal block of the outdoor unit,
after which the forced cooling operation will begin
(Max. 10 minutes). Recover refrigerant by handling
the valve.
5.
After recovering the refrigerant, push the refrigerant
recovery switch while closing the valve. The
operation will stop.
6.
Turn off the power supply.
DANGER
Be careful of electric shock because the P.C. board has
an electrical current running through it.
0.8
0.8
WARNING
These switches are used for service/maintenance and
should not be operated (the air conditioner may not
operate properly).
Refrigerant
recovery
switch
EN-28
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