Refrigerant Volume Adjustment Mode Operation - Mitsubishi Electric PUHY-200YMF-C Service Handbook

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 flow chart.
Notes 1 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 2 A refrigerant volume adjustment performed in the cooling mode must be done with a gauge reading of 13 kg/cm
higher.
If the pressure does not reach refrigerant cannot be collected halfway.
Therefore, collect used refrigerant and evacuate the unit completely, and then fill new refrigerant up to a specified
quantity.
Notes 3 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 4 When supplementing the refrigerant volume, please be careful to charge with liquid refrigerant.
TH1 Self-diagnosis Switch
1 2 3 4 5 6 7 8 9 10
ON
TH7 Self-diagnosis Switch
1 2 3 4 5 6 7 8 9 10
ON
Using these, judge TH1, Tc - TH5 and Tc - TH7.
TH5 Self-diagnosis Switch
1 2 3 4 5 6 7 8 9 10
ON
Tc Self-diagnosis Switch
1 2 3 4 5 6 7 8 9 10
ON
–77–
for PU(H)Y-(P)200·250YMF-C
Pd (High pressure)
1 2 3 4 5 6 7 8 9 10
ON
2 G or