Fujitsu Airstage J-II - Additional Charge Calculation

ADDITIONAL CHARGE CALCULATION2-5.
The outdoor unit is charged refrigerant at the factory. ●
Additional refrigerant required to be charged on site depending on pipe length. ●
The additional refrigerant charge amount is calculated according to the following formula. ●
Round up the calculated result to two decimal places. ●
CALCULATION OF ADDITIONAL CHARGE REFRIGERANT

1. Calculation of additional amount for outdoor unit
Model HP
b
Factory charged
amount (kg)
AJ

A40LALH 4 4.80
AJ

A45LALH 5 5.30
AJ

A54LALH 6 5.30
Diameter of liquid
pipe (mm)
a
Additional amount for
pipe length (kg/m)
ø6.35 0.021
ø9.52 0.058
2. Calculation of additional amount for pipe length
Total
length of
ø9.52mm
liquid pipe
a :
x 0.058
kg/m
m
kg
Total
length of
ø6.35mm
liquid pipe
a :
x 0.021
kg/m
m
kg
+
A=
=
Total
kg
3. Calculation of additional charge refrigerant
A =
kg
Round up A to 2 decimal place.
4. Factory charged amount
b : Outdoor unit
factory charged amount
kg
B=
5. Total refrigerant amount check
C = A + B =
kg
Note : Check the total refrigerant amount under the following conditions.
Condition Computational formula
Total amount of refrigerant ≤ 15.70kg C ≤ 15.70kg
When total refrigerant amount exceed limitation.
Reduce pipe length for refrigerant system. ●
Change the refrigerant system configuration. ●
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