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8.2.2 Procedure for charging the system with refrigerant
(1) Remove the charging cap from the liquid pipe. Use standard refrigeration practices
when charging refrigerant.
(2) Attach a charging hose to the refrigerant gas cylinder, and connect it to the charging
port.
(3) Add refrigerant by calculating the additional refrigerant amount in accordance with
the calculation formula indicated below.
(4) Remove the charging cap and install the charging hose.
(5) Remove the body caps (gas pipe and liquid pipe), and open the valves.
(6) Close the body caps.
(7) After adding refrigerant, indicate the added charging volume on the unit.
NOTES:
• Tighten the body caps and charging caps to the torque values specified in the Table A.
Toopenandclosethevalves,UseanM4hexagonwrenchforliquidpipe.
Usethecompressorfixtureremovedin"3.6.Removingthecompressorfixture"asa
valve wrench for gas pipe.
• If you cannot charge the specified amount of refrigerant with the above method, be
sure to charge the refrigerant through the gas pipe while operating in cooling mode. In
order to prevent liquid back-flow, carefully operate the refrigerant gas cylinder valve so
that the refrigerant will flow in certain part at a time.
8.2.3 Checking total amount of refrigerant and calculating the
amount of refrigerant charge to be added
• 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 decimal places.
Model HP
d
Factory
charged
amount (kg)
a
Additional
amount for
outdoor
unit (kg)
AJG072JATAH
8
9.7 0.0
AJG090JATAH
10
AJG108JATAH
12
AJG126JATAH
14
11. 8
0.4
AJG144JATAH
16
AJG162JATAH
18
0.8
AJG180JATAH
20
Diameter of
liquid pipe
(mm)
b
Additional
amount for pipe
length (kg/m)
Ø 6.35 0.021
Ø 9.52 0.058
Ø 12.70 0.114
Ø 15.88 0.178
Ø 19.05 0.268
Ø 22.22 0.360
(1) Calculation of additional amount for pipe length.
A=
a
Outdoor unit
1 additional
amount for
outdoor unit
+
a
Outdoor unit
2 additional
amount for
outdoor unit
+
a
Outdoor unit
3 additional
amount for
outdoor unit
+
a
Outdoor unit
4 additional
amount for
outdoor unit
=
Total
kg kg kg kg kg
(2) Calculation of additional amount for pipe length.
B=
Total
length of
ø 22.22
mm liquid
pipe
b ×
0.360
(kg/m)
+
Total
length of
ø 19.05
mm liquid
pipe
b ×
0.268
(kg/m)
+
Total
length of
ø 15.88
mm liquid
pipe
b ×
0.178
(kg/m)
+
Total
length of
ø 12.70
mm liquid
pipe
b ×
0.114
(kg/m)
m m m m
kg kg kg kg
+
Total length
of ø 9.52 mm
liquid pipe
b ×
0.058
(kg/m)
=
Total length
of ø 6.35 mm
liquid pipe
b ×
0.021
(kg/m)
+
Total
m m
kg kg kg
(3) Calculation of additional charge refrigerant.
C=A+B=
kg
(Round up C to 2 decimal place)
(4) Calculation of factory charged amount.
A=
d
Outdoor
unit 1 fac-
tory charged
amount
+
d
Outdoor
unit 2 fac-
tory charged
amount
+
d
Outdoor
unit 3 fac-
tory charged
amount
+
d
Outdoor
unit 4 fac-
tory charged
amount
=
Total
kg kg kg kg kg
(5) Total refrigerant amount check.
E=C+D=
kg
NOTES:
Check the total refrigerant amount under the following conditions.
Upper limit of total refrigerant amount
Number of
outdoor unit per
refrigerant system
Total capacity (HP) Total amount of refrigerant (kg)
1 outdoor unit
8 to 16 E≤31.4
18 to 20 E≤38.5
2 outdoor units
16 to 34 E≤62.8
36 to 40 E≤77.0
3 outdoor units
24 to 52 E≤94.2
54 to 60 E≤115.5
4 outdoor units 62 to 80 E≤125.6
<Calculation>
When there are 3 outdoor units (AJG162JATAH, AJG144JATAH, AJG126JATAH)
connected to 1 system.
(1) Calculation of additional amount for outdoor unit.
A=0.8(kg)+0.4(kg)+0.4(kg)=1.6(kg)
(2) Calculation of additional amount for pipe length.
If liquid pipe length is the following.
ø19.05: 50 m, ø15.88: 25 m, ø12.70: 25 m, ø9.52: 20 m, ø6.53: 15 m
Additional charge volume
B=50(m)×0.268(kg/m)+25(m)×0.178(kg/m)
+25(m)×0.114(kg/m)+20(m)×0.058(kg/m)
+15(m)×0.021(kg/m)
=22.175kg
(3) Calculation of additional charge refrigerant
C=A+B=1.6(kg)+22.175(kg)=23.78(kg)
(4) Calculation of factory charged amount
D=11.8(kg)+11.8(kg)+11.8(kg)=35.4(kg)
(5) Check the total amount of refrigerant
When 3 outdoor units are connected to 1 system, the following condition must be
satisfied.
Condition:E=C+D≤94.2(kg)
Calculation:23.78(kg)+35.4(kg)=59.18(kg)<94.2(kg)
→Noproblemiftheaboveconditionissatisfied.
8.3. Installing thermal insulation
• Install thermal insulation material after conducting
the “8.1 Sealing test”.
• To prevent condensation and water droplets, install
thermal insulation on the refrigerant pipe.
• Refer to the table to determine the thickness of the
thermal insulation.
• If the outdoor unit is installed at a level that is higher
than the indoor unit, the water that has condensed
in the 3-way valve of the outdoor unit could travel to
the indoor unit.
Therefore, use putty in the space between the pipe
and the thermal insulation to prevent the entry of
water.
Putty (locally
purchased)
Insulation
Table. Selection of thermal
insulation
(Use a thermal insulation
with equal heat transmis-
sion rate or below 0.040
W/(m·k))
* When the ambient tempera-
ture and relative humid-
ityexceed32°C(DB)and
85% respectively, please
strengthen thermal insula-
tion of refrigerant pipe.
Relative humidity
Thermal insulation minimum
thickness (mm)
≤ 70% ≤ 75% ≤ 80% ≤ 85%
Pipe
diameter
(mm)
6.35 8 10 13 17
9.52 9 11 14 18
12.70 10 12 15 19
15.88 10 12 16 20
19.05 10 13 16 21
22.22 11 13 17 22
28.58 11 14 18 23
34.92 11 14 18 24
41.27 12 15 19 25
44.50 13 16 21 27
50.80 13 17 22 28
9378945746-02_IM_En_240404_2.indd 219378945746-02_IM_En_240404_2.indd 21 2024/04/04 16:26:112024/04/04 16:26:11
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Productinformatie
| Merk | Fujitsu |
| Model | AJG090JATAH |
| Categorie | Airco |
| Taal | Nederlands |
| Grootte | 5576 MB |
