Fujitsu Airstage J-II Series Design & Technical Manual page 585

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 Ton
AOU36RLAVM 3
AOU48RLAVM 4
AOU60RLAVM 5
2. Calculation of additional amount for pipe length
Total length
3/8"
of ø
(
9.52mm)
A=
x 0.039 lbs/ft.
liquid pipe (0.058 kg/m)
ft. (m)
3. Calculation of additional charge refrigerant
A = lbs. (kg)
4. Factory charged amount
b : Outdoor unit
factory charged amount
B=
lbs. (kg)
5. Total refrigerant amount check
C = A + B =
Note : Check the total refrigerant amount under the following conditions.
Total amount of refrigerant ≤ 34.61 lbs. (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
pipe [in. (mm)]
amount [lbs. (kg)]
10.6 (4.80) ø1/4" (6.35)
11.7 (5.30) ø3/8" (9.52)
11.7 (5.30)
Total
length
a :
1/4"
of ø
+
x 0.014 lbs/ft.
(
6.35mm)
(0.021 kg/m)
liquid pipe
ft. (m)
lbs. (kg)
Round up A to 2 decimal place.
lbs. (kg)
Condition
- (06 - 21) -
a
Additional amount for pipe
length [lbs./ft. (kg/m)]
0.014 (0.021)
0.039 (0.058)
Total
a :
=
lbs. (kg)
lbs. (kg)
Computational formula
C ≤ 34.61 lbs. (15.70kg)