Mitsubishi City Multi PURY-P400 Service Handbook page 66

Note: 1 If there are any units that are not operating, it will cause refrigerant to accumulate, so by all means operate all the
indoor units. Also, in order to prevent stable operation from being disrupted by the thermostat going OFF, set the trial
operation mode.
Note: 2 If the high pressure is stabilized, it is safe to judge that the operation condition is stable.
Judge that operation is stabilized or not stabilized by whether the compressor starts after 3 or more minutes have
passed.
Note: 3 When turning on SW1 to
Note: 4 If AL = 1, it indicates that adjustment is not necessary, but when the liquid level is on the low side even if it is in the
AL = 1 region, if one unit only is run and refrigerant is accumulating in the units that are stopped, it may result in
there being insufficient refrigerant, so at such a time, adjustment is necessary.
Note: 5 Determine the difference in the volume of refrigerant necessary for cooling and for heating as follows, and carry out
supplementary charging in accordance with the table below.
* The piping length is the total pipe length calculated for a high press pipe with a ø25.4 size.
Pipe Length
60 m or less 60 ~ 90 m 90 m or longer
Additional Refrigerant
18 kg
Volume
1 2 3 4 5 6 7 8 9 10
ON
, the LED will display the liquid level.
27 kg 31 kg
–65–
If the liquid pipe size is ø 12.7, the actual length is 0.3
If the liquid pipe size is ø 9.52, the actual length is 0.2
If the liquid pipe size is ø 6.35, the actual length is 0.1