En-23
Additional charging
8. 3.
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 speci
fi
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.
Procedure for charging the system with refrigerant
8. 3. 1.
Remove the charging cap from the liquid pipe. Use standard refrigeration prac-
1)
tices when charging refrigerant.
Attach a charging hose to the refrigerant cylinder, and connect it to the charging
2)
port.
Add refrigerant by calculating the additional refrigerant volume in accordance with
3)
the calculation formula indicated below.
Remove the charging cap and install the charging hose.
4)
Remove the body caps (suction gas pipe, discharge gas pipe and liquid pipe),
5)
and open the valves.
Close the body caps.
6)
After adding refrigerant, indicate the added charging volume on the unit.
7)
Tighten the body caps and charging caps to the torque values speci
fi
ed in the
*
Table A.
To open and close the valves, Use an M4 hexagon wrench for liquid pipe.
Use
an
M8
hexagon
wrench
for
suction gas pipe and discharge gas pipe.
*
*
If you can not charge the speci
fi
ed amount of refrigerant with the above
method, be sure to charge the refrigerant through the gas pipe while operat-
ing in cooling mode. In order to prevent liquid back-
fl
ow, carefully operate
the refrigerant cylinder valve so that the refrigerant will
fl
ow in certain part at
a time.
Checking total amount of refrigerant and calculat-
8. 3. 2.
ing 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 dec
• imal
places.
Model
HP
d
Factory charged amount
(kg)
a
Additional amount for
outdoor unit (kg)
AJ A72GALH
8HP
11.8
3.0
AJ A90GALH
10HP
11.8
3.0
AJ 108GALH
12HP
11.8
3.0
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
=
Total
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
=
Total
kg
Calculation of additional charge refrigerant
(3)
C=A+B =
kg
(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
kg
Total refrigerant amount check
(5)
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
≤
35kg
E
≤
35kg
For 2 outdoor units per refrigerant system
: Total amount of refrigerant
≤
70kg
E
≤
70kg
For 3 outdoor units per refrigerant system
: Total amount of refrigerant
≤
105kg
E
≤
105kg
<Calculation>
When there are 3 outdoor units (AJ
•
108GALH, AJ A90GALH, AJ A72GALH)
connected to 1 system
Calculation of additional amount for outdoor unit
(1)
A=3.0(kg)+3.0(kg)+3.0(kg)=9.0(kg)
Calculation of additional amount for pipe length
(2)
If liquid pipe piping length is the following
ø
19.05 : 50m,
ø
15.88 : 25m,
ø
12.70 : 0m,
ø
9.53 : 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
Calculation of additional charge refrigerant
(3)
C=A+B =9.0(kg)+19.33(kg)=28.33(kg)
Calculation of factory charged amount
(4)
D=11.8(kg)+11.8(kg)+11.8(kg)=35.4 (kg)
Check the total amount of refrigerant
(5)
When 3 outdoor units are connected to 1 system, the following condition must be
satis
fi
ed.
Condition: E=C+D
≤
105(kg)
Calculation: 28.33(kg)+35.4(kg)=63.73(kg)<105(kg)
→
No problem if the above condition is satis
fi
ed.
9378945074_IM.indb Sec1:23
9378945074_IM.indb Sec1:23
2012-7-19 16:44:37
2012-7-19 16:44:37
Summary of Contents for AirStage AJH108GALH
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