Mitsubishi Electric PUHY-P450YKB-A1.TH [33/106] 9 1 calculation of the amount of additional refrigerant

Mitsubishi Electric PUHY-P200YKB-A1.TH [33/106] 9 1 calculation of the amount of additional refrigerant
GB
GB-31
KD79S703H01
9-9-1. Calculation of the amount of additional refrigerant
The amount of refrigerant to be added depends on the size and the total length of the liquid piping.
Calculate the amount of refrigerant to be charged according to the formula below.
Round up the calculation result to the nearest 0.1 kg (0.1 oz).
(1) Units "m" and "kg"
<Formula>
When the piping length from the outdoor unit to the farthest indoor unit is 30.5 m (100 ft) or shorter
Amount of
additional
charge (kg)
=
ø19.05 total length
× 0.29 (kg/m)
+
ø15.88 total length
× 0.2 (kg/m)
+
ø12.7 total length
× 0.12 (kg/m)
+
ø9.52 total length
× 0.06 (kg/m)
+
ø6.35 total length
× 0.024 (kg/m)
+
Outdoor unit
model
Amount (kg)
+
Total capacity of connected
indoor units
Amount (kg)
P200 0 80 or below 2.0
P250 0 81 to 160 2.5
P300 0 161 to 330 3.0
P350 0 331 to 390 3.5
P400 0 391 to 480 4.5
P450 0 481 to 630 5.0
P500 0 631 to 710 6.0
711 to 800 8.0
801 to 890 9.0
891 to 1070 10.0
1071 to 1250 12.0
1251 or above 14.0
When the piping length from the outdoor unit to the farthest indoor unit is longer than 30.5 m (100 ft)
Amount of
additional
charge (kg)
=
ø19.05 total length
× 0.26 (kg/m)
+
ø15.88 total length
× 0.18 (kg/m)
+
ø12.7 total length
× 0.11 (kg/m)
+
ø9.52 total length
× 0.054 (kg/m)
+
ø6.35 total length
× 0.021 (kg/m)
+
Outdoor unit
model
Amount (kg)
+
Total capacity of connected
indoor units
Amount (kg)
P200 0 80 or below 2.0
P250 0 81 to 160 2.5
P300 0 161 to 330 3.0
P350 0 331 to 390 3.5
P400 0 391 to 480 4.5
P450 0 481 to 630 5.0
P500 0 631 to 710 6.0
711 to 800 8.0
801 to 890 9.0
891 to 1070 10.0
1071 to 1250 12.0
1251 or above 14.0
<Example>
Outdoor unit model: P300
Total capacity of connected indoor units: 361
* Refer to the pipe connection examples in section 9-4 for the pipes marked with the letters below.
A: ø12.7; 40 m
B: ø9.52; 10 m
C: ø9.52; 15 m
D: ø9.52; 10 m
a: ø9.52; 10 m
b: ø9.52; 5 m
c: ø6.35; 10 m
d: ø6.35; 10 m
e: ø9.52; 10 m

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