Mitsubishi PLA-A12BA Technical Data Book page 68

9-1-4. ADDITION OF REFRIGERANT
• Additional charging is not necessary if the pipe length does not exceed 20 m(70 ft) for A12-A36 or 30 m(100 ft) for A42.
• If the pipe length exceeds the specified length above, charge the unit with additional R410A refrigerant according to the
permitted pipe lengths in the chart below.
* When the unit is stopped, charge the unit with the additional refrigerant through the liquid stop valve after the pipe
extensions and indoor unit have been vacuumized.
* When the unit is operating, add refrigerant to the gas check valve using a safety charger. Do not add liquid refrigerant
directly to the check valve.
* After charging the unit with refrigerant, note the added refrigerant amount on the service label (attached to the unit).
• Be careful when installing multiple units. Connecting to an incorrect indoor unit can lead to abnormally high pressure and have
a serious effect on operation performance.
Max. pipe
Model
length
A12, A18 30 m, 100 ft
A24, A30, A36 50 m, 165 ft
A42 50 m, 16 5 ft
68
Max. height
20 m 25 m
difference
70 ft 80 ft
0.06 kg
30 m, 100 ft 0
2 oz
0.17 kg
30 m, 100 ft 0
6 oz
30 m, 100 ft 0 0
Additional refrigerant charging amount (kg/oz)
27 m 30 m 33.5 m 36.6 m
90 ft 100 ft 110 ft 120 ft
0.11 kg 0.17 kg
– –
4 oz 6 oz
0.34 kg 0.51 kg 0.68 kg 0.85 kg
12 oz 18 oz 24 oz 30 oz
0.17 kg 0.34 kg
0 0
6 oz 12 oz
40 m 43 m 45.5 m 48.8 m
130 ft 140 ft 150 ft 160 ft
– – – –
1.02 kg 1.19 kg 1.36 kg 1.53 kg
36 oz 42 oz 48 oz 54 oz
0.51 kg 0.68 kg 0.85 kg 1.02 kg
18 oz 24 oz 30 oz 36 oz
50 m
165 ft
–
1.70 kg
60 oz
1.19 kg
42 oz