Mitsubishi Electric BDT CITY MULTI Installation And Pre-Commissioning Booklet page 52

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ADDITIONAL REFRIGERANT CALCULATIONS (Y SERIES) example
3. Piping Design
3-3. Refrigerant charging calculation
PUHY-P-YKB
At the time of shipping, the outdoor unit is charged with the refrigerant. As this charge does not include the amount needed for extended
piping, additional charging for each refrigerant line will be required on site. In order that future servicing may be properly provided, always keep
a record of the size and length of each refrigerant line and the amount of additional charge by writing it in the space provided on the outdoor unit.
(1) Calculation of additional refrigerant charge
Calculate the amount of additional charge based on the length of the piping extension and the size of the refrigerant line.
Use the table to the below as a guide to calculating the amount of additional charging and charge the system accordingly.
If the calculation results in a fraction of less than 0.1kg, round up to the next 0.1kg. For example, if the result of the calculation
was 12.33kg, round the result up to 12.4kg.
<Additional Charge>
Units "m" and "kg"
<Formula>
When the piping length from the outdoor unit to the farthest indoor unit is 30.5 m (100 ft) or shorter
Amount of
additional
=
charge (kg)
+
When the piping length from the outdoor unit to the farthest indoor unit is longer than 30.5 m (100 ft)
Amount of
additional
=
charge (kg)
+
52
ø19.05 total length ø15.88 total length
+
× 0.29 (kg/m) × 0.2 (kg/m)
Outdoor unit
Amount (kg)
model
P200 0
P250 0
P300 0
P350 0
P400 0
P450 0
ø19.05 total length ø15.88 total length
+
× 0.26 (kg/m) × 0.18 (kg/m)
Outdoor unit
Amount (kg)
model
P200 0
P250 0
P300 0
P350 0
P400 0
P450 0
ø12.7 total length
+ +
× 0.12 (kg/m)
Total capacity of connected
indoor units
80 or below
81 to 160
161 to 330
331 to 390
391 to 480
+
481 to 630
631 to 710
711 to 800
801 to 890
891 to 1070
1071 to 1250
1251 or above
ø12.7 total length
+ +
× 0.11 (kg/m)
Total capacity of connected
indoor units
80 or below
81 to 160
161 to 330
331 to 390
391 to 480
+
481 to 630
631 to 710
711 to 800
801 to 890
891 to 1070
1071 to 1250
1251 or above
ø9.52 total length ø6.35 total length
+
× 0.06 (kg/m) × 0.024 (kg/m)
Amount (kg)
2.0
2.5
3.0
3.5
4.5
5.0
6.0
8.0
9.0
10.0
12.0
14.0
ø9.52 total length ø6.35 total length
+
× 0.054 (kg/m) × 0.021 (kg/m)
Amount (kg)
2.0
2.5
3.0
3.5
4.5
5.0
6.0
8.0
9.0
10.0
12.0
14.0
AN1 2nd