Mitsubishi Electric HP120TNU-A Service Handbook page 305

[8-12 Measures for Refrigerant Leakage ]
(4) Close the ball valves (BV1 and BV2).
(5) Collect the refrigerant that remains inside the outdoor unit. Do not discharge refrigerant into air
into the atmosphere when it is collected.
(6) Repair the leak.
(7) After repairing the leak, replace the dryer with the new one, and perform evacuation
outdoor unit.
(8) To adjust refrigerant amount, open the ball valves (BV1 and BV2) inside the outdoor unit.
3. Leak spot: In the case of extension pipe for indoor unit (Heating season)
(1) Run all the indoor units in heating test run mode.
1) To run the indoor unit in test run mode, set SW4 (769) on the outdoor unit control board to ON.
2) Change the setting of the remote controller for all the indoor units to the heating mode.
3) Check that all the indoor units are performing a heating operation.
(2) Stop all the indoor units, and stop the compressor.
1) To stop all the indoor units and the compressors, turn SW4 (769) on the outdoor control board from ON to OFF.
2) Check that all the indoor units are stopped.
(3) Close the ball valves (BV1 and BV2).
(4) Collect the refrigerant that remains inside the indoor unit. Do not discharge refrigerant into air
into the atmosphere when it is collected.
(5) Repair the leak.
(6) After repairing the leak, perform evacuation of the extension pipe
the ball valves (BV1 and BV2) to adjust refrigerant.
4. Leak spot: In the case of outdoor unit (Heating season)
1) Collect the refrigerant in the entire system (outdoor unit, extended pipe and indoor unit). Do not discharge refrigerant into the
atmosphere when it is collected.
2) Repair the leak.
3) Repair the leak, and evacuate the air from the entire system
(outdoor unit + extension pipe + indoor unit), and charge the system with that amount. For details, refer to the following
page(s). [6-3-3 Maximum refrigerant charge]
*1. For details, refer to the following page(s). [1-3-3 Vacuum Drying]
64
- chapter 8
*1
for the indoor unit, and open
*1
. Then, calculate the proper amount of refrigerant to be added
*1
inside the
HWE18220_GB