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8. 3. Additional charging
CAUTION
Do not turn on the power unless all operations are complete.
After evacuating the system, add refrigerant.
Do not charge the system with a refrigerant other than R410A.
Always keep to the limit on the total amount of refrigerant. Exceeding the limit on
the total amount of refrigerant will lead to malfunction during charging of refrigerant.
Do not reuse recovered refrigerant.
Use an electronic scale to measure the charging amount of refrigerant.
Adding more refrigerant than the specifi ed amount will cause a malfunction.
Charge refrigerant using the liquid pipe.
Adding refrigerant through the gas pipe will cause a malfunction.
Add refrigerant by charging the system with the refrigerant in the liquid state. If
the refrigerant cylinder is equipped with a siphon, it is not necessary to place the
cylinder upright.
8. 3. 1. Procedure for charging the system with refrigerant
1) Remove the charging cap from the liquid pipe. Use standard refrigeration prac-
tices when charging refrigerant.
2) Attach a charging hose to the refrigerant cylinder, and connect it to the charging
port.
3) Add refrigerant by calculating the additional refrigerant volume 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.
* Tighten the body caps and charging caps to the torque values specifi ed in the
Table A.
To open and close the valves, Use an M4 hexagon wrench for liquid pipe.
Use an M10 hexagon wrench for gas pipe.
* *
If you can not charge the specifi ed 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-fl ow, carefully operate the refrigerant cylin-
der valve so that the refrigerant will fl ow in certain part at a time.
8. 3. 2. 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 refrig-
erant 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)
AJ
072LNTCH 8HP 11.70 0
AJ
090LNTCH 10HP 11.70 0
AJ
108LNTCH 12HP 11.80 3.30
AJ
126LNTCH 14HP 11.80 3.30
AJ
144LNTCH 16HP 11.80 3.30
AJ
162LNTCH 18HP 11.80 3.30
Diameter of liquid pipe (mm)
b
Additional amount for pipe length (kg/m)
Ø6.35 0.021
Ø9.52 0.058
Ø12.70 0.114
Ø15.88 0.178
Ø19.05 0.268
(1) Calculation of additional amount for outdoor unit
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
=
Total
kg
(2) Calculation of additional amount for pipe length
B =
Total length
of ø19.05 mm
liquid pipe
b
× 0.268
(kg/m)
m
kg
+
Total le
ngth
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 ø9.52 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
=
Total
kg
(3) Calculation of additional charge refrigerant
C=A+B =
kg
(Round up C to 2 decimal place)
(4) Calculation of factory charged amount
D =
d
Outdoor unit1
factory charged amount
kg
+
d
Outdoor unit2
factory charged amount
kg
+
d
Outdoor unit3
factory charged amount
kg
=
Total
kg
(5) Total refrigerant amount check
E=C+D=
kg
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
<Calculation>
• When there are 3 outdoor units (AJ
144LNTCH, AJ
126LNTCH, AJ
108LNTCH)
connected to 1 system
(1) Calculation of additional amount for outdoor unit
A = 3.30 (kg) + 3.30 (kg) + 3.30 (kg) = 9.90 (kg)
(2) Calculation of additional amount for pipe length
If liquid pipe piping length is the following
ø
19.05 : 50m,
ø
15.88 : 25m,
ø
12.70 : 0m,
ø
9.52 : 20m,
ø
6.53 : 15m
Additional charge volume B = 50 (m) × 0.268 (kg/m) + 25 (m) × 0.178 (kg/m)
+ 0 (m) × 0.114 (kg/m) + 20 (m) × 0.058 (kg/m)
+ 15 (m) × 0.021 (kg/m)
= 19.325kg
(3) Calculation of additional charge refrigerant
C = A + B = 9.90 (kg) + 19.33 (kg) = 29.23 (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
satisfi ed.
Condition: E = C + D ≤ 94.5 (kg)
Calculation: 29.23 (kg) + 35.4 (kg) = 64.63 (kg) < 94.5 (kg)
→ No problem if the above condition is satisfi ed.
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Productinformatie
| Merk | Fujitsu |
| Model | AJH090LNTCH |
| Categorie | Airco |
| Taal | Nederlands |
| Grootte | 5465 MB |
