Evacuation Of The Equipment - Panasonic CU-4E23JBE Service Manual

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 end down to avoid the metal powder entering the pipe.
3. Please make flare after inserting the flare nut onto the copper pipes.

10.4. Evacuation Of The Equipment

WHEN INSTALLING AN 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 side
of a charging set and the service port of the gas side
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 Low side valve 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
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 gas side 3-way valve at a
torque of 18 N • m with a torque wrench.
7. Remove the valve caps of both of the gas side and liquid
side 3-way valve. Position both of the valves to "OPEN"
using a hexagonal wrench (4 mm).
8. Mount valve caps onto the gas side and liquid side of the
3-way valve.
• Be sure to check for gas leakages.
• If gauge needle does not move from 0 cmHg (0 MPa) to -76 cmHg (-0.1 MPa), in step
- If the leak stops when the piping connections are tightened further, continue working from step
- 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 reinstallation.
- Take care of the liquid refrigerant, it may cause frostbite.
AVOID REFRIGERANT GAS
above take the following measure:
30
.