Panasonic CS-VA75KE, Service Manual

Page: 78 / 112

CUTTING AND FLARING THE PIPING
1. Please cut using pipe cutter and then remove the burrs.
2. Remove the burrs by using reamer. If burrs is not
removed, gas leakage may be caused.
Turn the piping and down to avoid the metal powder
entering the pipe.
3. Please make flare after inserting the flare nut onto the
copper pipes.
11.3.4. EVACUATION OF THE EQUIPMENT
WHEN INSTALLING AND AIR CONDITIONER, BE SURE TO
EVACUATE THE AIR INSIDE THE INDOOR UNIT AND PIPES
in the following procedure.
1. Connect a charging hose with a push pin to the Low and
High side of a charging set and the service port of the 3-way
valve.
•
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 0 cmHg (0
MPa) to -76 cmHg (-0.1 MPa). Then evacuate the air
approximately ten minutes.
4. Close the valve of both the Low and High sides of the
charging set and turn off the vacuum pump. Make sure that
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 torque of
18 N.m 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 (4 mm).
8. Mount valve caps onto the 2-way valve and the 3-way valve.
•
Be sure to check for gas leakage.
CAUTION
•
If gauge needle does not move from 0 cmHg (0
MPa) to -76 cmHg (-0.1 MPa), 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 the location of leak.
•
Do not release refrigerant during piping work for
installation and re-installation. Take care of the
liquid refrigerant, it may cause frostbite.
11.3.5. 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 5 × 1.5 mm
2
flexible cord, type designation H05 RN-F 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.
11.3.6. PIPE INSULATION
1. Please carry out insulation at pipe 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 6 mm or above.
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CS-VA75KE CU-VA75KE / CS-VA95KE CU-VA95KE / CS-VA125KE CU-VA125KE