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1 Connect a charging hose with a push pin to the Low side of a charging set and the service port of the 3-way
valve.
z Be sure to connect the end of the charging hose with the push pin to the service port.
2 Connect the center hose of the charging set to a vacuum pump.
3 Turn on the power switch of the vacuum pump and make sure that the needle in the gauge moves from
0cmHg (0 Mpa) to -76cmHg (-0.1Mpa). Then evacuate the air approximately ten minutes.
4 Close the Low side valve of the charging set and turn off the vacuum pump. Make sure the needle in the
gauge does not move after approximately five minutes.
Note: BE SURE TO TAKE THIS PROCEDURE IN ORDER TO AVOID REFRIGERANT GAS LEAKAGE.
5 Disconnect the charging hose from the vacuum pump and from the service port of the 3-way valve.
6 Tighten the service port caps of the 3-way valve at a torque of 18Nym with a torque wrench.
7 Remove the valve caps of both of the 2-way valve and 3-way valve. Position both of the valves to “OPEN”
using a hexagonal wrench (4mm).
8 Mount valve caps onto the 2-way valve and the 3-way valve.
z Be sure to check for gas leakage.
Caution
• If gauge needle does not move from 0cmHg (0Mpa) to -76cmHg (-0.1Mpa), in step 3 above take the following
measure:
• If the leak stops when the piping connections are tightened further, continue working from step 3.
• If the leak does not stop when the connections are retightened, repair location of leak.
• Do not release refrigerant during piping work for installation and reinstallation. Take care of the liquid refrigerant,
it may cause frostbite.
8.3.4 Connect the cable to the outdoor unit
1 Remove the control board cover from the unit by loosening the screw.
2 Connecting cable between indoor unit and outdoor unit shall be approved polychloroprene sheathed 3x 1.0
mm
2
. ( YC9MKV,YC9MKV-7) or 3 x 1.5mm
2
(YC12MKV, YC12MKV-6, YC12MKV-7) flexible cords, type
designation 245 IEC 57 or heavier cord.
3 Secure the cable onto the control board with the holder (clamper).
4 Attach the control board cover back to the original position with the screw.
5 For wiring stripping and connection requirement, refer to instruction 8.2.4.1 of indoor unit.
8.3.5 Piping insulation
1 Please carry insulation at piping connection portion as mentioned in Indoor/Outdoor Unit Installation Diagram.
Please wrap the insulated piping end to prevent water from going inside the piping.
2 If drain hose or connecting piping is in the room (where dew may form), please increase the insulation by
using POLY-E-FOAM with thickness 6mm or above.
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