Mitsubishi Electric CITY MULTI PUHY-400YMF-B, Руководство по обслуживанию, Страница: 130 / 204

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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
ON
, the LED will display the liquid level.
SW4-2 OFF : Variable Capacity Unit AL Display
SW4-2 ON : Constant Capacity Unit AL Display
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
ø
19.05 size.
Note: 6 When turning on SW 1 to
1 2 3 4 5 6 7 8 9 10
ON
, the LED will display the liquid level (AL).
SW4-2 OFF : Variable Capacity Unit AL Display
SW4-2 ON : Constant Capacity Unit AL Display
Note: 7 Middle capacity operation refers to the smallest indoor unit operation capacity attainable with the constant
capacity Unit. Unlike the outdoor unit models, operate about 70 % of the indoor units when operating the
constant capacity unit.
Note: 8 With Super Y, liquid refrigerant correction control will begin after there has been an preliminary overcharged
refrigerant abnormality (Code 1600).
To determine whether there will be liquid refrigerant correction control, turn SW1-3 ON. (During control, one of
LD2 through LD8 will Blink.)
Note: 9 In the case of the PUHY-(P)400·500 YMF-B
If the adjustments in 6 ~ 0 are sure, even if the refrigerant is supplied in B until the maximum refrigerant level
is reached, it will not become AL = 2. Therefore, in the case of AL = 2, replenishment is cone at
6
and
8
, or it
can be judged that there was a calculation mistake in B .
Pipe Length
Additional Refrigerant
Volume
60 m or less 60 ~ 90 m 90 m or longer
19 kg 24 kg 29 kg
If the liquid pipe size is ø 15.88, the actual length is 0.85
If the liquid pipe size is
ø
12.7, the actual length is 0.4
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