Additional Refrigerant Charge - Mitsubishi Electric City Multi PURY-P72TLMU-A Manuel D'installation

9-9. Additional refrigerant charge

Charge refrigerant in a liquid state.
- Charging refrigerant in the gaseous state will change the composition of the refrigerant and lead to a performance drop.
Do not use a charging cylinder when charging refrigerant.
- The use of a charging cylinder may change the composition of the refrigerant and lead to a performance drop.
The amount of refrigerant that is shown in the table below is factory-charged in the outdoor units. The amount necessary for extended piping is not
included and needs to be added on site.
Unit model Factory-charged amount [kg (oz)]
P72
P96
P120
P140
P168
The amount of refrigerant that is shown in the table below is the maximum amount to be added on site.
Unit model Maximum amount to be added [kg (oz)]
P72T/YLMU
P96T/YLMU
P120T/YLMU
P144T/YLMU
P168T/YLMU
P144T/YSLMU
P168T/YSLMU
P192T/YSLMU
P216T/YSLMU
P240T/YSLMU
P264T/YSLMU
P288T/YSLMU
P312T/YSLMU
P336T/YSLMU
Both refrigerant overcharge and undercharge will cause problems. Charge the system with the proper amount of refrigerant.
Record the added refrigerant amount on the label attached to the control box panel for future servicing.
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 high-pressure piping and 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" (In an R2 system)
<Formula>
・When the piping length from the outdoor unit to the farthest indoor unit is 30.5 m (100 ft) or shorter
Amount of
High-pressure pipe ø28.58
additional charge =
total length × 0.36 (kg/m)
(kg)
Liquid pipe ø12.7 total
+
length × 0.12 (kg/m)
Total capacity of outdoor
units
+
P120
P144–P336
Number of sub BC
controllers
+
1
2
* When connecting PLFY-P08NBMU-E2, add 0.3 kg of refrigerant per indoor unit.
WT07598X02
6.0 (212)
8.0 (283)
10.5 (371)
10.5 (371)
10.5 (371)
27.5 (971)
33.5 (1182)
37 (1306)
47 (1658)
47 (1658)
47 (1658)
48 (1694)
58 (2046)
75 (2646)
76 (2681)
78 (2752)
78 (2752)
78 (2752)
78 (2752)
High-pressure pipe ø22.2
+
total length × 0.23 (kg/m)
Liquid pipe ø9.52 total
+
length × 0.06 (kg/m)
Amount (kg)
(to be added for standard or main BC
controller)
P72 3.0
P96 4.5
4.5
6.0
Amount (kg)
Total capacity of
(to be added for
connected indoor units
sub BC controller)
1.0 27 or below
2.0 28 to 54
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 450
451 or above
High-pressure pipe ø19.05 High-pressure pipe ø15.88
+ +
total length × 0.16 (kg/m) total length × 0.11 (kg/m)
Liquid pipe ø6.35 total
+
length × 0.024 (kg/m)
Main BC controller
+
HA-type
Amount (kg)
(to be added for
indoor unit)
2.0
Single
+
2.5
3.0
3.5 Combination
4.5
5.0
6.0
8.0
9.0
10.0
12.0
14.0
GB-25
Liquid pipe ø15.88 total
+
length × 0.2 (kg/m)
Amount (kg)
2.0
Amount (kg)
Outdoor unit model (to be added for
outdoor unit)
P72 to P96 0
P120 to P168 1.0
P144 to P192 0
P216 1.0
P240 to P336 2.0