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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.
11
ANNUAL MAINTENANCE
• For an air conditioning system that is operated on a regular basis, cleaning and maintenance of the indoor/outdoor
units are strongly recommended.
As a general rule, if an indoor unit is operated for about 8 hours daily, the indoor/outdoor units will need to be cleaned
at least once every 3 months. This cleaning and maintenance should be carried out by a qualified service person.
Failure to clean the indoor/outdoor units regularly will result in poor performance, icing, water leaking and even
compressor failure.
EN-21
- 11 -
12
FUNCTIONS TO BE IMPLEMENTED LOCALLY
Night operation control
• Low-noise operation is available during nighttime
hours by connecting a commercially available timer
and separately sold applicable control wire TCB-
KBOS1E. For more information, refer to the manuals
of these parts.
• The power saving function of the air conditioner
reduces the level of nighttime operating noise.
• Sufficient capacity for low-noise operation cannot
always be provided, depending on external conditions,
including the outside air temperature.
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)
Ø9.5
Ø15.9
Reference outside
diameter (mm)
Ø19.1
• Do not use any pipe with a wall thickness less than
these thicknesses due to insufficient pressure
capacity.
• To use an existing Ø19.1 mm pipe, set bit 3 of SW802
(switch for existing pipe) on the P.C. board of the
outdoor unit to ON. In this case, the heating
performance may be reduced depending on the
outside air temperature and room temperature.
SW802
When shipped from factory When using existing pipe
0.8
1.0
Wall thickness (mm)
1.0
EN-22
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