Mitsubishi Electric PUHY-200YMF-B Service Handbook page 88

Note 1 If there are any units which 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 basically 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 liquid pipe with a ø12.7 size.
Pipe Length 60 m or less
Additional Refrigerant
8 kg
Volume
• PUHY-P200·250YMF-B
Note 6 When turning on SW1 to
If the adjustment in items 6~A is sure, AL will not become AL = 2 even if the MAX refrigerant volume is
Note 7
charged. Therefore, in the case of AL = 2, it can be judged that there was overcharging in items 6 and 8, or
that there was a mistake in the calculations in B.
1 2 3 4 5 6 7 8 9 10
ON
, the LED will display the liquid level.
60~90 m 90 m or longer
10 kg 12 kg
1 2 3 4 5 6 7 8 9 10
ON
, the LED will display the liquid level.
–86–
for PU(H)Y-(P)200·250YMF-B
If the liquid pipe size is ø9.52, the actual length is 0.50
If the liquid pipe size is ø6.35, the actual length is 0.2