Additional Refrigerant Charge - Mitsubishi Electric City Multi CMB-WM108V-AA Manuel D'installation

4.4. Additional refrigerant charge

Notes:
• 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 table below summarizes the factory-charged amount of refrigerant, the
maximum amount of refrigerant to be added on site, and the maximum total amount
of refrigerant in the system.
* R32 refrigerant is charged in the (E)M200–500YNW model of units, and R410A
refrigerant is charged in the (E)P200–500YNW model of units.
Factory-charged
Unit model
amount
5.2 (184)
M200YNW
M250YNW 5.2 (184)
M300YNW 5.2 (184)
M350YNW 8.0 (283)
M400YNW 8.0 (283)
M450YNW 10.8 (381)
M500YNW 10.8 (381)
Factory-charged
Unit model
amount
EM200YNW 5.2 (184)
EM250YNW 5.2 (184)
EM300YNW 5.2 (184)
EM350YNW 8.0 (283)
EM400YNW 8.0 (283)
EM450YNW 10.8 (381)
EM500YNW 10.8 (381)
Factory-charged
Unit model
amount
P200YNW 5.2 (184)
P250YNW 5.2 (184)
P300YNW 5.2 (184)
P350YNW 8.0 (283)
P400YNW 8.0 (283)
P450YNW 10.8 (381)
P500YNW 10.8 (381)
Factory-charged
Unit model
amount
EP200YNW 5.2 (184)
EP250YNW 5.2 (184)
EP300YNW 5.2 (184)
EP350YNW 8.0 (283)
EP400YNW 8.0 (283)
EP450YNW 10.8 (381)
EP500YNW 10.8 (381)
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.
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).
• The refrigerant does not need to be added for the indoor units in a Hybrid
City Multi system.
Maximum amount to Maximum total
be added on site amount in the system
13.5 (477) 18.7 (660)
13.5 (477) 18.7 (660)
15.5 (547) 20.7 (731)
15.5 (547) 23.5 (829)
19.5 (688) 27.5 (971)
19.5 (688) 30.3 (1069)
19.5 (688) 30.3 (1069)
Maximum amount to Maximum total
be added on site amount in the system
13.5 (477) 18.7 (660)
13.5 (477) 18.7 (660)
15.5 (547) 20.7 (731)
15.5 (547) 23.5 (829)
19.5 (688) 27.5 (971)
19.5 (688) 30.3 (1069)
19.5 (688) 30.3 (1069)
Maximum amount to Maximum total
be added on site amount in the system
31.8 (1122) 37.0 (1306)
37.8 (1333) 43.0 (1517)
37.8 (1333) 43.0 (1517)
41.3 (1457) 49.3 (1740)
47.3 (1668) 55.3 (1951)
44.5 (1570) 55.3 (1951)
45.2 (1595) 56.0 (1976)
Maximum amount to Maximum total
be added on site amount in the system
28.3 (998) 33.5 (1182)
34.3 (1210) 39.5 (1394)
34.3 (1210) 39.5 (1394)
39.0 (1375) 47.0 (1658)
39.0 (1375) 47.0 (1658)
44.7 (1577) 55.5 (1958)
45.2 (1595) 56.0 (1976)
■ (E)M200 to 500YNW (R32 refrigerant)
(1) Units "m" and "kg"
<Formula>
• When the piping length from the outdoor unit to the farthest HBC controller is
10 m (32 ft) or shorter
Amount of High-pressure pipe
additional = ø22.2 total length
charge (kg) × 0.23 (kg/m)
Outdoor unit model
(E)M200
(E)M250
[kg (oz)]
(E)M300
+
(E)M350
(E)M400
(E)M450
(E)M500
* Amount of refrigerant to be charged for
single-module units
• When the piping length from the outdoor unit to the farthest HBC controller is
longer than 10 m (32 ft)
Amount of High-pressure pipe
additional = ø22.2 total length
charge (kg) × 0.19 (kg/m)
Outdoor unit model
(E)M200
(E)M250
(E)M300
+
(E)M350
(E)M400
(E)M450
(E)M500
* Amount of refrigerant to be charged for
single-module units
<Example>
Outdoor unit model: PURY-EM300YNW-A1
Main HBC controller 1 model: CMB-WM108V-AA
Main HBC controller 2 model: CMB-WM108V-AA
Sub HBC controller model: CMB-WM108V-AB
* Refer to the pipe connection examples in Fig.2.4.2 (P.2).
A : ø15.88; 18 m
1
A : ø15.88; 5 m
2
A : ø15.88; 10 m
3
B: ø15.88; 8 m
The total length of the high-pressure piping and liquid piping in each case is as fol-
lows:
ø15.88 total length: 18 (A
ø15.88 total length: 5 (A
Therefore, when the piping length from the outdoor unit to the farthest HBC con-
troller is longer than 10 m (32 ft),
Amount of additional charge = (41 × 0.09) + 2.8 × 2
High-pressure pipe
+ ø19.05 total length +
× 0.16 (kg/m)
Amount (kg)
+
1.0
1.0
0
0
0
0
0
High-pressure pipe
+ ø19.05 total length +
× 0.13 (kg/m)
Amount (kg)
+
1.0
1.0
0
0
0
0
0
)
1
) + 10 (A ) + 8 (B) = 23
2 3
= 9.3 kg (Fractions are rounded up.)
High-pressure pipe
ø15.88 total length
× 0.11 (kg/m)
Amount
(kg/HBC controller)
2.8
High-pressure pipe
ø15.88 total length
× 0.09 (kg/m)
Amount
(kg/HBC controller)
2.8
11