Mitsubishi Electric CITY MULTI PUHY-HP-TNU-A Série Manuel D'installation page 35

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
HP72
HP96
+
HP120
* Amount of refrigerant to be
charged for single-module units
・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
HP72
HP96
+
HP120
* Amount of refrigerant to be
charged for single-module units
* When connecting PLFY-EP06NEMU-E, add 0.4 kg of refrigerant per indoor unit.
* When connecting PLFY-EP18NEMU-E1, add 0.4 kg of refrigerant per indoor unit.
* When connecting PLFY-EP30NEMU-E, add 0.4 kg of refrigerant per indoor unit.
* When connecting PLFY-EP36NEMU-E, add 0.4 kg of refrigerant per indoor unit.
* When connecting PEFY-P06NMAU-E, add 0.3 kg of refrigerant per indoor unit.
* When connecting PEFY-P24NMAU-E, add 0.3 kg of refrigerant per indoor unit.
* When connecting PEFY-P36NMAU-E, add 0.3 kg of refrigerant per indoor unit.
<Example>
Outdoor unit model: HP120
Total capacity of connected indoor units: 144
* 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
ø15.88 total length ø12.7 total length
+ +
× 0.2 (kg/m) × 0.12 (kg/m)
Total capacity of connected
Amount (kg)
indoor units
0 27 or below
0 28 to 54
+
0 55 to 126
127 to 144
145 to 180
181 to 234
235 to 273
274 to 307
308 to 342
343 to 411
412 to 480
481 or above
ø15.88 total length ø12.7 total length
+ +
× 0.18 (kg/m) × 0.11 (kg/m)
Total capacity of connected
Amount (kg)
indoor units
0 27 or below
0 28 to 54
+
0 55 to 126
127 to 144
145 to 180
181 to 234
235 to 273
274 to 307
308 to 342
343 to 411
412 to 480
481 or above
ø9.52 total length ø6.35 total length
+ +
× 0.06 (kg/m) × 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
ø9.52 total length ø6.35 total length
+ +
× 0.054 (kg/m) × 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