MITSUBISHI ELECTRIC P500YMF-C User Manual

Page 67

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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

1 2 3 4 5 6 7 8 9 10

, the LED will display the liquid level.

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

25.4 size.

If the liquid pipe size is

12.7, the actual length is 0.3

If the liquid pipe size is

9.52, the actual length is 0.2

If the liquid pipe size is

6.35, the actual length is 0.1

Pipe Length

Additional Refrigerant

Volume

60 m or less

60 ~ 90 m

90 m or longer

18 kg

27 kg

31 kg