36-EN
35-EN
– 18 –
EN
8
Earthing
WARNING
Be sure to connect the earth wire. (grounding work)
Incomplete grounding may cause an electric shock.
Connect the earth wire properly following applicable technical standards.
Connecting the earth wire 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 wire, you may experience an electric shock.
9
Finishing
After the refrigerant pipe, inter-unit wires, and drain pipe have been connected, cover them with
fi
nishing tape and
clamp them to the wall with off-the-shelf support brackets or their equivalent.
Keep the power wires and system interconnection wires off the valve on the gas side or pipes that have no heat
insulator.
10
Test run
y
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.
y
Check the following before starting a test run:
y
That all pipes are connected securely without leaks.
y
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.
y
Operate the air conditioner in the correct procedure as speci
fi
ed 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 quali
fi
ed service
person.
Failure to clean the indoor / outdoor units regularly will result in poor performance, icing, water leaking and even
compressor failure.
12
Air conditioner operating conditions
For proper performance, operate the air conditioner under the following temperature conditions:
Cooling operation
Dry bulb temp.
–15 °C to 46 °C
Heating operation
Wet bulb temp.
–15 °C to 15 °C
If air conditioner is used outside of the above conditions, safety protection may work.
13
Functions to be implemented locally
Handling existing pipe
When using the existing pipe, carefully check for the following:
y
Wall thickness (within the speci
fi
ed range)
y
Scratches and dents
y
Water, oil, dirt, or dust in the pipe
y
Flare looseness and leakage from welds
y
Deterioration of copper pipe and heat insulator
Cautions for using existing pipe
y
Do not reuse a
fl
are nut to prevent gas leaks.
Replace it with the supplied
fl
are nut and then process it to a
fl
are.
y
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.
y
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.
y
The pipe has been opened (disconnected from indoor unit or outdoor unit) for a long period.
y
The pipe has been connected to an outdoor unit that does not use refrigerant R32, R410A.
y
The existing pipe must have a wall thickness equal to or larger than the following thicknesses.
Reference outside
diameter (mm)
Wall thickness (mm)
Ø6.4
0.8
Ø9.5
0.8
Ø12.7
0.8
Ø15.9
1.0
Ø19.0
1.0
y
Do not use any pipe with a wall thickness less than these thicknesses due to insuf
fi
cient pressure capacity.
