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11. Pipe insulation
After finishing the leak test and vacuum drying, the
piping must be insulated. Take into account the following
points:
Make sure to insulate the connection piping and
•
refrigerant branch kits entirely.
Be sure to insulate the liquid piping and gas piping
•
(for all units).
Use heat resistant polyethylene foam which can
•
withstand a temperature of 70°C for liquid piping and
polyethylene foam which can withstand a
temperature of 120ºC for gas piping (for all units).
Reinforce the insulation on the refrigerant piping
•
according to the installation environment.
Ambient
temperature
≤30°C
75% to 80% RH
>30°C
If there is a possibility that condensation on the stop
•
valve might drip down into the indoor unit through
gaps in the insulation and piping because the outdoor
unit is located higher than the indoor unit, this must
be prevented by sealing up the connections.
See below figure.
2
1
5
12. Electrical wiring work
12.1 Precautions on electrical wiring work
WARNING
Electrical installation. All field wiring and
components must be installed by a licensed
electrician and must comply with the applicable
legislation.
NOTICE
Electrical wiring work recommendations.
To persons in-charge of electrical wiring work:
Do not operate the unit until the refrigerant
piping is complete. "10.4 Leak test and vacuum
drying". Running the unit before the piping is
ready will break the compressor.
DANGER: ELECTRICAL SHOCK
See "2. General safety precautions".
01_EN_3P748230-1.indd 31
Humidity
Minimum thickness
15 mm
≥80% RH
20 mm
1 Insulation material
4
2 Caulking, etc.
3
3 Liquid pipe stop valve
4 Gas pipe stop valve
5 Connection pipe
1
WARNING
A main switch or other means for disconnection,
•
having a contact separation in all poles, must be
incorporated in the fixed wiring in accordance
with the applicable legislation.
Use only copper wires.
•
All field wiring must be carried out in
•
accordance with the wiring diagram supplied
with the unit and the instructions given below.
Never squeeze bundled cables and be sure
•
that it does not come in contact with the
non-insulated piping and sharp edges.
Be sure no external pressure is applied to the
terminal connections.
Power supply wires must be attached securely.
•
If the power supply has a missing or wrong
•
N-phase, equipment will break down.
Be sure to establish an earth. Do not earth
•
the unit to a utility pipe, surge absorber,
or telephone earth.
Incomplete earth may cause electrical shock.
Be sure to install an earth leakage protector.
•
Failure to do so may cause electric shock or
fire.
Be sure to use a dedicated power circuit,
•
never use a power supply shared by another
appliance.
When installing the earth leakage protector
•
be sure that it is compatible with the inverter
(resistant to high frequency electric noise) to
avoid unnecessary opening of the earth
leakage protector.
As this unit is equipped with an inverter,
•
installing a phase advancing capacitor not
only will deteriorate power factor improvement
effect, but also may cause a capacitor
abnormal heating accident due to high
frequency waves.
Therefore, never install a phase advancing
capacitor.
Since this product is equipped with an
•
inverter, harmonics will be generated.
If local laws require the suppression of
harmonics on the building, please take
harmonic suppression measures on the
electrical equipment side.
Be sure to install the required fuses or circuit
•
breakers.
Do not operate until refrigerant piping work is
•
completed.
(If operated before completion of the piping
work, the compressor may break down.)
Never remove a thermistor, sensor, etc., when
•
connecting power wiring and transmission
wiring.
(If operated without thermistor, sensor, etc.,
the compressor may break down.)
31
23/01/2023 17:24:24
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