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WT09050X01
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 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.
[kg (oz)]
Unit model
Factory-
charged
amount
Maximum
amount to be
added on site
Maximum total
amount in the
system
Unit model
Factory-
charged
amount
Maximum
amount to be
added on site
Maximum total
amount in the
system
M200YNW
5.2 (184)
13.5 (477)
18.7 (660)
EM200YNW
5.2 (184)
13.5 (477)
18.7 (660)
M250YNW
5.2 (184)
13.5 (477)
18.7 (660)
EM250YNW
5.2 (184)
13.5 (477)
18.7 (660)
M300YNW
5.2 (184)
15.5 (547)
20.7 (731)
EM300YNW
5.2 (184)
15.5 (547)
20.7 (731)
M350YNW
8.0 (283)
15.5 (547)
23.5 (829)
EM350YNW
8.0 (283)
15.5 (547)
23.5 (829)
M400YNW
8.0 (283)
19.5 (688)
27.5 (971)
EM400YNW
8.0 (283)
19.5 (688)
27.5 (971)
M450YNW
10.8 (381)
19.5 (688)
30.3 (1069)
EM450YNW
10.8 (381)
19.5 (688)
30.3 (1069)
M500YNW
10.8 (381)
19.5 (688)
30.3 (1069)
EM500YNW
10.8 (381)
19.5 (688)
30.3 (1069)
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).
・
The refrigerant does not need to be added for the indoor units in a Hybrid City Multi system.
(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 additional
charge (kg)
=
High-pressure pipe
ø22.2 total length
× 0.23 (kg/m)
+
High-pressure pipe
ø19.05 total length
× 0.16 (kg/m)
+
High-pressure pipe
ø15.88 total length
× 0.11 (kg/m)
+
Outdoor unit model
Amount (kg)
+
Amount
(kg/HBC controller)
(E)M200
1.0
2.8
(E)M250
1.0
(E)M300
0
(E)M350
0
(E)M400
0
(E)M450
0
(E)M500
0
* Amount of refrigerant to be charged for
single-module units
