Mitsubishi Electric CITY MULTI PUHY-P-YKB-A1 Manuel D'installation page 33

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
ø19.05 total length
additional =
× 0.29 (kg/m)
charge (kg)
Outdoor unit
model
+
・When the piping length from the outdoor unit to the farthest indoor unit is longer than 30.5 m (100 ft)
Amount of
ø19.05 total length
additional =
× 0.26 (kg/m)
charge (kg)
Outdoor unit
model
+
<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
KD79S703H01
ø15.88 total length
+
× 0.2 (kg/m)
Amount (kg)
P200 0
P250 0
P300 0
P350 0
P400 0
+
P450 0
P500 0
ø15.88 total length
+
× 0.18 (kg/m)
Amount (kg)
P200 0
P250 0
P300 0
P350 0
P400 0
+
P450 0
P500 0
ø12.7 total length ø9.52 total length
+ +
× 0.12 (kg/m) × 0.06 (kg/m)
Total capacity of connected
indoor units
80 or below
81 to 160
161 to 330
331 to 390
391 to 480
481 to 630
631 to 710
711 to 800
801 to 890
891 to 1070
1071 to 1250
1251 or above
ø12.7 total length ø9.52 total length
+ +
× 0.11 (kg/m) × 0.054 (kg/m)
Total capacity of connected
indoor units
80 or below
81 to 160
161 to 330
331 to 390
391 to 480
481 to 630
631 to 710
711 to 800
801 to 890
891 to 1070
1071 to 1250
1251 or above
GB-31
ø6.35 total length
+
× 0.024 (kg/m)
Amount (kg)
2.0
2.5
3.0
3.5
4.5
5.0
6.0
8.0
9.0
10.0
12.0
14.0
ø6.35 total length
+
× 0.021 (kg/m)
Amount (kg)
2.0
2.5
3.0
3.5
4.5
5.0
6.0
8.0
9.0
10.0
12.0
14.0