MITSUBISHI ELECTRIC PE-15MYC - Manual (Page 94)

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Piping connection
Please follow the following procedures, during the piping connection work is carried out.
If the procedures are not followed properly, the refrigerant and valve sheet might gush out from the ball valve.
It might cause the injury.
Warning.
In case of Brazing type
1. Open the ball valve cap before removing the by-pass tube.
Then, turn the knob of the ball valve from ’close’ to ’open’
position.
2. Please repeat to close and open the ball valve of gas and liquid side at the same time (3 times or more).
And finally make sure the ball valve is at close position.
3. Cut part A (two places) of the by-pass tube as shown in figure below.
There will be small amount of refrigerant gushed
out of the by-pass tube at the moment.
Caution
4. Make sure that the ball valve is wrapped with enough wet cloth, during the brazing of the by-pass tube
(for cooling purpose). Make sure the temperature of ball valve is below 100 degree centigrade. (If the
temperature of the ball valve is over 100 degree centigrade, the refrigerant and valve sheet might gush
out from the ball valve. It might cause the injury.)
5. Please make sure the ball valve is cool enough when removing the by-pass tube. Wait for a while for
further cooling of the ball valve, before the piping connection work begins.
6. When the piping connection begins. Again, make sure that the ball valve is wrapped with enough wet
cloth, during the brazing for cooling the ball valve. Make sure the temperature of ball valve is below 100
degree centigrade. (If the temperature of the ball valve is over 100 degree centigrade, the refrigerant and
valve sheet might gush out from the ball valve. It might cause the injury.)
7. Before charging the refrigerant, vacuum the pipes to clear all the air and water.
8. Charge the additional amount of refrigerant according to the table.
9. Turn the knob of the ball valve to ’open’ position after leak check.
10. Finally, put the cap back to the ball valve.
CLOSE OPEN
CUT
CUT
enough wet
cloth