Mitsubishi Electric City Multi CMH-WM250V-A, Service Handbook

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[6-3 Evaluating and Adjusting Refrigerant Charge ]
6 -
chapter 6 BS_06_E
6 Tes
t Ru
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6-3-5 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 hydro unit is 10 m (32 ft) or shorter
 When the piping length from the outdoor unit to the farthest hydro unit is longer than 10 m (32 ft)
Amount of
additional
charge (kg)
=
ø19.05 total
length
× 0.29 (kg/m)
+
ø15.88 total
length
× 0.2 (kg/m)
+
ø12.7 total
length
× 0.12 (kg/m)
+
ø9.52 total
length
× 0.06 (kg/m)
+
ø6.35 total
length
× 0.024 (kg/m)
+
Outdoor unit model Amount (kg)
+
Hydro unit model Amount (kg)
(E)M200 0 WM250 3.0
(E)M250 0 WM350 3.0
(E)M300 0 WM500 3.0
(E)M350 0
(E)M400 0
(E)M450 0
(E)M500 0
* Amount of refrigerant to be charged for
single-module units
Amount of
additional
charge (kg)
=
ø19.05 total
length
× 0.24 (kg/m)
+
ø15.88 total
length
× 0.16 (kg/m)
+
ø12.7 total
length
× 0.10 (kg/m)
+
ø9.52 total
length
× 0.050 (kg/m)
+
ø6.35 total
length
× 0.019 (kg/m)
+
Outdoor unit model Amount (kg)
+
Hydro unit model Amount (kg)
(E)M200 0 WM250 3.0
(E)M250 0 WM350 3.0
(E)M300 0 WM500 3.0
(E)M350 0
(E)M400 0
(E)M450 0
(E)M500 0
* Amount of refrigerant to be charged for
single-module units
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