En-38
Checking total amount of refrigerant and calculating the amount of refrigerant charge to be added
8. 3. 2.
The amount of refrigerant charge to be added is the total value of the basic refrigerant charge amount and the
•
value calculated from the length of the liquid pipe.
Round up the value to 2 dec
• imal
places.
Model
HP
d
Factory charged
amount (kg)
a
Additional amount
for outdoor unit (kg)
AJ A72LALH
8HP
11.20
0
AJ A90LALH
10HP
11.20
0
AJ 108LALH
12HP
11.80
1.20
AJ 126LALH
14HP
11.80
3.30
AJ 144LALH
16HP
11.80
3.30
Diameter of liquid
pipe (mm)
b
Additional amount for
pipe length (kg/m)
Ø6.35
0.021
Ø9.53
0.058
Ø12.70
0.114
Ø15.88
0.178
Ø19.05
0.268
Calculation of additional amount for outdoor unit
(1)
A =
a
Outdoor unit1
additional amount for
outdoor unit
kg
+
a
Outdoor unit2
additional amount for
outdoor unit
kg
+
a
Outdoor unit3
additional amount for
outdoor unit
kg
=
Calculation of additional amount for pipe length
(2)
B =
Total length
of ø19.05 mm
liquid pipe
b
× 0.268
(kg/m)
m
kg
+
Total length of
ø15.88 mm
liquid pipe
b
× 0.178
(kg/m)
m
kg
+
Total length of
ø12.70 mm
liquid pipe
b
× 0.114
(kg/m)
m
kg
+
Total length of
ø9.53 mm
liquid pipe
b
× 0.058
(kg/m)
m
kg
+
Total length of
ø6.35 mm
liquid pipe
b
× 0.021 (kg/
m)
m
kg
=
Calculation of additional charge refrigerant
(3)
C=A+B = (Round up C to 2 decimal place)
Calculation of factory charged amount
(4)
D =
d
Outdoor unit1
factory charged amount
kg
+
d
Outdoor unit2
factory charged amount
kg
+
d
Outdoor unit3
factory charged amount
kg
=
Total refrigerant amount check
(5)
E=C+D=
Note : Check the total refrigerant amount under the following conditions
Condition
Computational formula
For 1 outdoor unit per refrigerant system
: Total amount of refrigerant <
= 31.5kg
E <
= 31.5kg
For 2 outdoor units per refrigerant system :
Total
amount
of
refrigerant <
= 63kg
E <
= 63kg
For 3 outdoor units per refrigerant system : Total amount of refrigerant <
= 94.5kg
E <
= 94.5kg
Total
kg
Total
kg
kg
Total
kg
kg
9378945029-03_IM_EN.indb 38
9378945029-03_IM_EN.indb 38
2011-9-20 16:26:03
2011-9-20 16:26:03
