3] refrigerant volume adjustment mode operation – MITSUBISHI ELECTRIC P500YMF-C User Manual
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Pd (High pressure)
[3] Refrigerant Volume Adjustment Mode Operation
(1)
Procedure
Depending on the operating conditions, it may be necessary either to charge with supplementary refrigerant, or to
drain out some, but if such a case arises, please follow the procedure given below.
Switching the function select switch (SW2-4), located on the outdoor unit’s control board, ON starts refrigerant
volume adjustment mode operation and the following operation occurs. (Refrigerant recovery mode and oil recovery
mode will be invalid.)
Additionally, if the LED monitor display switch (SW1) on the outdoor unit’s control board is set to
1 2 3 4 5 6 7 8 9 10
ON
,
the accumulator’s liquid level is indicated by the LED lighting position.
AL = 0 (No fluid in accumulator)
AL = 1 (Liquid in accumulator)
AL = 2 (Overcharge)
1
2
Notes 1
Even if AL = 1 for a short time after operation in the refrigerant volume adjustment mode starts, as
time passes (as the refrigeration system stabilizes), it may change to AL = 0.
Notes 2
As the refrigerant volume can not be adjusted in the heating mode, retrieve the refrigerant, evacu-
ate air and then fill the specified volume of refrigerant if it is necessary to adjust the refrigerant
volume in the winter season.
Notes 3
A refrigerant volume adjustment performed in the cooling mode must be done with a gauge reading of 13 kg/cm
2
G or
higher.
If the pressure does not reach this guage reading the refrigerant cannot be collected.
Therefore, collect used refrigerant and evacuate the unit completely, and then fill new refrigerant up to a specified
quantity.
Notes 4
Judgment by the AL is at best only a rough guideline. Please do not add refrigerant based on the
AL reading alone. (Be sure to obtain calculations of the correct amount before adding refrigerant.)
Notes 5
When supplementing the refrigerant volume, please be careful to charge with liquid refrigerant.
1 2 3 4 5 6 7 8 9 10
ON
1 2 3 4 5 6 7 8 9 10
ON
1 2 3 4 5 6 7 8 9 10
ON
1 2 3 4 5 6 7 8 9 10
ON