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21 21 11
Flaring
•
Use special pipe cutter and flare tool exclusive for R410A.
(1) Cut the connection pipe to the necessary length with a pipe cutter.
(2) Hold the pipe downward so that the cuttings will not enter the pipe and remove
any burrs.
(3) Insert the flare nut (always use the flare nut attached to the indoor and outdoor
units respectively) onto the pipe and perform the flare processing with a flare tool.
Leakage of refrigerant may result if other flare nuts are used.
(4) Protect the pipes by pinching them or with tape to prevent dust, dirt, or water from
entering the pipes.
Check if [L] is flared uniformly
and is not cracked or scratched.
L
Dimension A (mm)
Pipe outside
Flare tool for R410A,
diameter [mm (in1)]
6.35 (1/4)
9.52 (3/8)
12.70 (1/2)
15.88 (5/8)
•
When using conventional flare tools to flare R410A pipes, the dimension A should
be approximately 0.5mm more than indicated in the table (for flaring with R410A
flare tools) to achieve the specified flaring. Use a thickness gauge to measure the
dimension A.
Width across flats
21 21 21
Bending pipes
•
To prevent breaking of the pipe, avoid sharp bends. Bend the pipe with a radius of
curvature of 100mm or more.
•
If the pipe is bent repeatedly at the same place, it will break.
•
If pipes are shaped by hand, be careful not to collapse them.
•
Do not bend the pipes at an angle of more than 90°.
•
When pipes are repeatedly bent or stretched, the material will harden, making it
difficult to bend or stretch them any more.
•
Do not bend or stretch the pipes more than 3 times.
21 21 21
Pipe connection
•
Be sure to install the pipe against the port on the indoor unit and the outdoor unit
correctly. If the centering is improper, the flare nut cannot be tightened smoothly.
If the flare nut is forced to turn, the threads will be damaged.
•
Do not remove the flare nut from the outdoor unit pipe until immediately before
connecting the connection pipe.
•
After installing the piping, make sure that the connection pipes do not touch the
compressor or outer panel. If the pipes touch the compressor or outer panel, they
will vibrate and produce noise.
(1) Detach the caps and plugs from the pipes.
(2) Center the pipe against the port on the outdoor unit, and then turn the flare nut
by hand.
(3) Tighten the flare nut of the connection pipe at the outdoor unit valve connector.
(4) After tightening the flare nut by hand, use a torque wrench to fully tighten it.
3-way valve (Liquid)
Flare nut
Connection pipe
(Liquid)
9379069366_IM.indb 8
B
Die
A
Pipe
Dimension B
- 014
[mm]
clutch type
9.1
13.2
0 to 0.5
16.6
19.7
Pipe outside
Width across flats
diameter
of Flare nut
[mm (in1)]
[mm]
6.35 (1/4)
17
9.52 (3/8)
22
12.70 (1/2)
26
15.88 (5/8)
29
CAUTION
CAUTION
3-way valve (Gas)
Flare nut
Connection pipe
(Gas)
•
Hold the torque wrench at its grip, keeping it in a right angle with the pipe, in order
to tighten the flare nut correctly.
•
Outer panel may be distorted if fastened only with a wrench. Be sure to fix the
elementary part with a holding wrench (spanner) and fasten with a torque wrench
(refer to below diagram). Do not apply force to the blank cap of the valve or hang a
wrench, etc., on the cap. If blank cap is broken, it may cause leakage of refrigerant.
Holding
wrench
0
Flare nut
[mm (in1)]
6.35 (1/4) dia.
9.52 (3/8) dia.
12.70 (1/2) dia.
15.88 (5/8) dia.
19.05 (3/4) dia.
21 21 41
Handling precautions for the valves
•
Mounted part of Blank cap is sealed for protection.
•
Fasten blank cap tightly after opening valves.
Operating the valves
•
Use a hexagon wrench (size 4mm).
•
Opening
(1) Insert the hexagon wrench into the valve shaft, and turn it
counterclockwise.
(2) Stop turning when the valve shaft can no longer be turned.
(Open position)
•
Closing
(1) Insert the hexagon wrench into the valve shaft, and turn it
clockwise.
(2) Stop turning when the valve shaft can no longer be turned.
(Closed position)
Opening direction
Liquid pipe
21
ELECTRICAL WIRING
21 11
The precautions of electrical wiring
•
Wiring connections must be performed by a qualified person in accordance with
specifications.
The rated supply of this product is 50Hz, 230V. Use a voltage within the range of
198-264V.
•
Before connecting the wires, make sure the power supply is OFF.
•
Be sure to install a breaker of the specified capacity. When selecting breaker,
please comply with the laws and the regulations of each country. One breaker
must be installed on the power supply of the outdoor unit. Wrong selection and
setup of the breaker will cause electric shock or fire.
•
Be sure to install an earth leakage breaker. Otherwise, it will cause electric shock
or fire.
•
Do not connect AC power supply to the transmission line terminal board.
Improper wiring can damage the entire system.
•
Connect the connector cord securely to the terminal.
Faulty installation can cause a fire.
•
Make sure to secure the insulation portion of the connector cable with the cord
clamp. A damaged insulation can cause a short circuit.
•
Never install a power factor improvement condenser. Instead of improving the
power factor, the condenser may overheat.
•
Before servicing the unit, turn the power supply switch OFF. Then, do not touch
electric parts for 10 minutes due to the risk of electric shock.
•
Make sure to perform grounding work. Improper grounding work can cause
electric shocks.
CAUTION
Blank cap
Flare nut
Torque wrench
90°
Torque wrench
Tightening torque
[N·m (lgf·cm)]
16 to 18 (160 to 180)
32 to 42 (320 to 420)
49 to 61 (490 to 610)
63 to 75 (630 to 750)
90 to 110 (900 to 1100)
Opening direction
Hexagon wrench
Seal (blank cap
installation portion)
Gas pipe
WARNING
En-8
15/11/2555 11:18:05
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