Additional Charge Calculation - Fujitsu AIRSTAGE J-II Design & Technical Manual

2-5.

ADDITIONAL CHARGE CALCULATION

● 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
AJ  A40LALH 4
AJ  A45LALH 5
AJ  A54LALH 6
2. Calculation of additional amount for pipe length
Total
a :
length of
ø9.52mm
x 0.058
A=
liquid pipe
kg/m
m
3. Calculation of additional charge refrigerant
kg
A =
4. Factory charged amount
b : Outdoor unit
factory charged amount
B=
5. Total refrigerant amount check
C = A + B =
Note : Check the total refrigerant amount under the following conditions.
Total amount of refrigerant ≤ 15.70kg
When total refrigerant amount exceed limitation.
● Reduce pipe length for refrigerant system.
● Change the refrigerant system configuration.
b
Diameter of liquid
Factory charged
amount (kg)
4.80
5.30
5.30
Total
a :
length of
ø6.35mm
x 0.021
+
liquid pipe
kg/m
m
kg
Round up A to 2 decimal place.
kg
kg
Condition
- (06 - 22) -
Additional amount for
pipe (mm)
pipe length (kg/m)
ø6.35 0.021
ø9.52 0.058
Total
=
kg
kg
a
Computational formula
C ≤ 15.70kg