Panasonic CS-A9CKPG - Manual (Page 52)

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.
11.3.4. 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 and High side of a charging set and the service port of the 3-way valve.
•
Besureto connect theend of thecharging hosewith thepush pin to theserviceport.
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. Closethevalveof both theLow and High sides of thecharging set and turn off thevacuum pump. Makesurethat theneedle
in the gauge does not move after approximately five minutes.
Note: BE SURE TO FOLLOW THIS PROCEDURE IN ORDER TO AVOID REFRIGERANT GAS LEAKAGE.
5. Disconnect thecharging hosefrom thevacuum pump and from theserviceport of the3-way valve.
6. Tighten the service port caps of the 3-way valve at a torque of 18 N.m with a torque wrench.
7. Removethevalvecaps of both of the2-way valveand 3-way valve. Position both of thevalves to “OPEN” using a hexagonal
wrench (4 mm [0.16 inch]).
8. Mount valvecaps onto the2-way valveand the3-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 reinstallation. Take care of the liquid refrigerant, it may cause
frostbite.
52
CS-A9CKPG CU-A9CKP6G / CS-A12CKPG CU-A12CKP6G