Mitsubishi Electric City Multi PURY-P72TNU-A-BS Manuel D'installation page 30

The amount of refrigerant that is shown in the table below is the maximum total amount in the system.
Unit model Maixmum total amount in the system [kg (oz)]
P72T/YNU
P96T/YNU
P120T/YNU
P144T/YNU
P168T/YNU
P192T/YSNU
P216T/YSNU
P240T/YSNU
P264T/YSNU
P288T/YSNU
P312T/YSNU
P336T/YSNU
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
(kg) × 0.36 (kg/m)
Liquid pipe ø15.88 total
+ length
× 0.2 (kg/m)
Main or sub BC controller
+
Total capacity of
Single
+
Combination
WT09106X03
33.5 (1182)
41.5 (1464)
47.5 (1676)
49.3 (1739)
50.3 (1775)
74 (2611)
90 (3175)
90 (3175)
90 (3175)
90 (3175)
90 (3175)
90 (3175)
High-pressure pipe ø22.2
+ total length
× 0.23 (kg/m)
Liquid pipe ø12.7 total
+ length
× 0.12 (kg/m)
Amount (kg/unit)
J-type 1.5
JA-type 3.0
KA-type 4.7
KB-type 0.4
Amount (kg)
outdoor units (to be added for outdoor unit)
72 0
96 0
120 0
144 0
168 0
192 4.4
216 4.4
240 4.4
192 0
216 0
240 0
264 0
288 0
312 0
336 0
384 8.8
432 8.8
Unit model Maixmum total amount in the system [kg (oz)]
EP72T/YNU
EP96T/YNU
EP120T/YNU
EP144T/YNU
EP168T/YNU
EP192T/YNU
EP192T/YSNU
EP216T/YNU
EP216T/YSNU
EP240T/YNU
EP240T/YSNU
EP264T/YSNU
EP288T/YSNU
EP312T/YSNU
EP336T/YSNU
EP384T/YSNU
EP432T/YSNU
High-pressure pipe ø19.05
+ total length +
× 0.16 (kg/m)
Liquid pipe ø9.52 total
+ length +
× 0.06 (kg/m)
Total capacity of connected
indoor units
27 or below
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
Ⓐ
Total capacity of
outdoor units
72
96
120
144
Single
168
192
216
240
+
192
216
240
264
Combination 288
312
336
384
432
GB-28
33.5 (1182)
41.5 (1464)
47.5 (1676)
49.3 (1739)
50.3 (1775)
50.3 (1775)
74 (2611)
50.3 (1775)
90 (3175)
50.3 (1775)
90 (3175)
90 (3175)
90 (3175)
90 (3175)
90 (3175)
90 (3175)
90 (3175)
High-pressure pipe ø15.88
total length
× 0.11 (kg/m)
Liquid pipe ø6.35 total
length
× 0.024 (kg/m)
Amount (kg)
(to be added for indoor unit)
2.0
2.5
3.0
3.5
4.5
5.0
6.0
8.0
9.0
10.0
12.0
14.0
Amount (kg)
1.5
1.5
3.0
2.5
4.0
3.5
4.0
4.5
4.0
4.5
5.0
2.5
1.5
2.0
2.0
0
0