Table of Contents
12. PIPING DESIGN
12-3. Refrigerant charging calculation
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 [4oz], round up to the next 0.1kg [4oz]. For example, if the result of the calculation
was 12.38kg [436.4oz], round the result up to 12.4kg [437oz].
* When connecting PEFY-P06NMAU-E**, PEFY-P24NMAU-E**, or PEFY-P36NMAU-E**, add 0.3 kg [11 oz] of refrigerant per indoor unit.
* When connecting PLFY-EP06NEMU-E**, add 0.4 kg [15 oz] of refrigerant per indoor unit.
* When connecting PLFY-EP18NEMU-E**, PLFY-EP30NEMU-E** or PLFY-EP36NEMU-E**, add 0.65 kg [23oz] of refrigerant per indoor
unit.
Units "m" and "kg"
• When the piping length from the outdoor unit to the farthest indoor unit is 30.5 m (100 ft) or shorter
Amount of
ø19.05 total length
additional
=
× 0.29 (kg/m)
charge (kg)
Outdoor unit
model
HP72
+
HP96
HP120
*Amount of refrigerant to be
charged for single-module units
• When the piping length from the outdoor unit to the farthest indoor unit is longer than 30.5 m (100 ft)
Amount of
ø19.05 total length
additional
=
× 0.26 (kg/m)
charge (kg)
Outdoor unit
model
HP72
+
HP96
HP120
*Amount of refrigerant to be
charged for single-module units
MEES21K108
ø15.88 total length
ø12.7 total length
+
+
× 0.2 (kg/m)
× 0.12 (kg/m)
Total capacity of connected
Amount (kg)
indoor units
0
27 or below
+
0
28 to 54
0
55 to 126
127 to 144
145 to 180
181 to 234
235 to 273
274 to 307
308 to 342
343 to 411
412 to 480
481 or above
ø15.88 total length
ø12.7 total length
+
+
× 0.18 (kg/m)
× 0.11 (kg/m)
Total capacity of connected
Amount (kg)
indoor units
0
27 or below
+
0
28 to 54
0
55 to 126
127 to 144
145 to 180
181 to 234
235 to 273
274 to 307
308 to 342
343 to 411
412 to 480
481 or above
Hyper Heating Inverter Y-Series
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
100
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