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8
Grounding
WARNING
Be sure to connect the grounding wire. (grounding work)
Incomplete grounding may cause an electric shock.
Connect the grounding wire properly following applicable technical standards.
Connecting the grounding wire is essential to preventing electric shock and to reducing noise and electrical
chargeson 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 a grounding wire, you may experience an electric shock.
9
Finishing
After the refrigerant pipe, inter-unit wires, and drain pipe have been connected, make sure they are supported and
fixed in place for the entire length.
Keep the power wires and system interconnection wires away from all factory wiring and piping.
10
Test run
• Turn on the circuit breaker at least 12 hours before starting the system to preheat the compressor and
prevent damage.
To protect the compressor, power is supplied from the 208/230 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 over pressurized, 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 using 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.
27-EN
12
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.
• The existing pipe must have a wall thickness equal to or larger than the following thicknesses.
Reference outside
Wall thickness (in (mm))
diameter (in (mm))
1/4" (6.4)
0.03" (0.8)
3/8" (9.5)
0.03" (0.8)
1/2" (12.7)
0.03" (0.8)
• Do not use any pipe with a wall thickness less than these thicknesses due to insufficient pressure capacity.
� 14 �
EN
28-EN
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