Panasonic CU-2E18NBU service manual Evacuation of the Equipment, Cutting And Flaring The Piping

CUTTING AND FLARING THE PIPING

1Please cut using pipe cutter and then remove the burrs.

2Remove 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.

3Please 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.

1Connect 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.

2Connect the micron gauge between vacuum pump and service port of outdoor units.

3Turn on the power switch of the vacuum pump and make sure that connect digital micron gauge and to pull down to a value of 500 microns.

4To make sure micron gauge a value

500 microns and close the low side valve of the charging set and turn off the vacuum pump.

5Disconnect the vacuum pump house from the service port of the 3-way valve.

6Tighten the service port caps of gas side

3-way valve at a torque of 13.3 Ibf.ft with a torque wrench.

7Remove 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 (5/32").

8Mount valve caps onto the 2-way valve and 3-way valve.

o Be sure to check for gas leakage.

šIf micron gauge value does not descend 500 microns, take the following measures:

-If the leak stops when the piping connections are tightened further, continue working from step e.

-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 when handling the liquid refrigerant, it may cause frostbite.

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