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S.D. WY
MEE15K036
3. Piping Design
SYSTEM DESIGN
3-3. Refrigerant charging calculation
(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 below as a guide to calculate 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.
* When connecting PEFY-P20VMA3-E units, add 0.54 kg of refrigerant for each of these units.
* When connecting PEFY-P25/32/40VMA3-E units, add 0.74 kg of refrigerant for each of these units.
* When connecting PEFY-P50/63/71/80/100/125VMA3-E units, add 1.16 kg of refrigerant for each of these units.
At the time of shipping, the heat source 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 heat source unit.
<Additional Charge>
Units "m" and "kg"
<Formula>
When the piping length from the heat source unit to the farthest indoor unit is 30.5 m (100 ft) or shorter
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)
+
Heat source unit
model
Amount (kg)
+
Total capacity of connected
indoor units
Amount (kg)
P200
0
80 or below
2.0
P250
0
81 to 160
2.5
P300
0
161 to 330
3.0
P350
0
0
1
331 to 390
3.5
P400
391 to 480
4.5
P600
1
P550
0
P500
0
P450
481 to 630
5.0
631 to 710
6.0
711 to 800
8.0
801 to 890
9.0
891 to 1070
10.0
1071 to 1250
12.0
1251 or above
14.0
When the piping length from the heat source unit to the farthest indoor unit is longer than 30.5 m (100 ft)
Amount of
additional
charge (kg)
=
ø19.05 total length
× 0.26 (kg/m)
+
ø15.88 total length
× 0.18 (kg/m)
+
ø12.7 total length
× 0.11 (kg/m)
+
ø9.52 total length
× 0.054 (kg/m)
+
ø6.35 total length
× 0.021 (kg/m)
+
Heat source unit
model
Amount (kg)
+
Total capacity of connected
indoor units
Amount (kg)
P200
0
80 or below
2.0
P250
0
81 to 160
2.5
P300
0
161 to 330
3.0
P350
0
0
1
331 to 390
3.5
P400
391 to 480
4.5
P600
1
P550
0
P500
0
P450
481 to 630
5.0
631 to 710
6.0
711 to 800
8.0
801 to 890
9.0
891 to 1070
10.0
1071 to 1250
12.0
1251 or above
14.0
0000003812.BOOK 194 ページ ２０１５年１１月１１日 水曜日 午後３時５９分
