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CAUTION
Tightening with an excessive torque may crack the
nut depending on installation conditions.
Piping with outdoor unit
Shape of valve differs according to the outdoor unit.
For details of installation, refer to the Installation
Manual of the outdoor unit.
Evacuation
Perform vacuuming from the charge port of valve of
the outdoor unit by using a vacuum pump.
For details, follow to the Installation Manual attached
to the outdoor unit.
Do not use the refrigerant sealed in the outdoor unit
for evacuation.
REQUIREMENT
For the tools such as charge hose, use those
manufactured exclusively for R32 or R410A.
Refrigerant amount to be added
For addition of the refrigerant, add refrigerant "R32 or
R410A" referring to the attached Installation Manual of
outdoor unit.
Use a scale to charge the refrigerant of specified
amount.
REQUIREMENT
Charging an excessive or too little amount of
refrigerant causes a trouble of the compressor.
Charge the refrigerant of specified amount.
A personnel who charged the refrigerant should
write down the pipe length and the added
refrigerant amount in the F-GAS label of the
outdoor unit. It is necessary to fix the compressor
and refrigeration cycle malfunction.
Airtight test / Air purge, etc.
For air tightness test, vacuum drying and adding
refrigerant, refer to the Installation Manual attached to
the outdoor unit.
CAUTION
Do not supply power to the indoor unit until the airtight
test and vacuuming are completed. (If the indoor unit
is powered on, the pulse motor valve is fully closed,
which extends the time for vacuuming.)
15-EN
Open the valve fully
Open the valve of the outdoor unit fully.
For details, refer to the Installation Manual attached to
the outdoor unit.
Gas leak check
Check with a leak detector or soap water whether gas
leaks or not, from the pipe connecting section or cap
of the valve.
REQUIREMENT
Use a leak detector manufactured exclusively for
HFC refrigerant (R32, R134a, R410A, etc.).
Heat insulation process
Apply heat insulation for the pipes separately at liquid
side and gas side.
For the heat insulation to the pipes at gas side,
be sure to use the material with heat-resisting
temperature 120°C or higher.
Using the attached heat insulation material, apply the
heat insulation to the pipe connecting section of the
indoor unit securely without gap.
REQUIREMENT
Apply the heat insulation to the pipe connecting
section of the indoor unit securely up to the root
without exposure of the pipe. (The pipe exposed
to the outside causes water leak.)
Wrap heat insulator with its slits facing up
(ceiling side).
Wrap the pipe with the attached heat insulator
without any gap between the indoor unit.
The seam must be faced upward
Indoor unit
(ceiling side).
Flare nut
Heat insulator
Heat insulation
of the pipe
Union
pipe
Banding band
(Accessory)
(Locally procured)
6
Electrical connection
WARNING
Use the specified wires for wiring connect the terminals. Securely fix them to prevent external forces
applied to the terminals from affecting the terminals.
Incomplete connection or fixation may cause a fire or other trouble.
Connect earth wire. (grounding work)
Incomplete grounding cause an electric shock.
Do not connect earth wires to gas pipes, water pipes, lightning conductor or telephone earth wires.
Appliance shall be installed in accordance with national wiring regulations.
Capacity shortage of power circuit or incomplete installation may cause an electric shock or a fire.
CAUTION
For communication line, use wires with the same type and size. lf each wire has a different type and
size from another one, it will cause a communication trouble.
If incorrect / incomplete wiring is carried out, it will cause an electrical fire or smoke.
Install an earth leakage breaker that is not tripped by shock waves. If an earth leakage breaker is not installed,
an electric shock may be caused.
Use the cord clamps attached to the product.
Do not damage or scratch the conductive core and inner insulator of power and system interconnection wires
when peeling them.
Use the power supply wire and control wires of specified thickness, type, and protective devices required.
Do not connect 208-240V power to the terminal blocks (Uv (U1)), (Uv (U2)), (A), (B) for control wiring.
(Otherwise, the system will fail.)
Perform the electric wiring so that it does not come to contact with the high-temperature part of the pipe.
The coating may melt resulting in an accident.
REQUIREMENT
For power supply wiring, strictly conform to the Local Regulation in each country.
For wiring of power supply of the outdoor units, follow the Installation Manual of each outdoor unit.
After connecting wires to the terminal blocks, provide a trap and fix wires with the cord clamp.
Run the refrigerant piping line and control wiring line in the same line.
Do not turn on the power of the indoor unit until vacuuming of the refrigerant pipes completes.
Power supply wire and communication wires specifications
Power supply wire and communication wires are locally procured.
For the power supply specifications, follow to the table below.
If capacity is little, it is dangerous because overheat or burnout may be caused.
For specifications of the power capacity of the outdoor unit and the power supply wires, refer to the Installation
Manual attached to the outdoor unit.
Indoor unit power supply
For the power supply of the indoor unit, prepare the exclusive power supply separated from that of the outdoor
unit.
Arrange the power supply, circuit breaker, and main switch of the indoor unit connected to the same outdoor unit
so that they are commonly used.
Power supply wire specification: Cable 3-core 2.5 mm², in conformity with Design 60245 IEC 57.
– 8 –
16-EN
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