Additional Charging - Fujitsu AOU48RLXFZ1 Installation Manual

71 31

Additional charging

• Do not turn on the power unless all operations are complete.
• Do not charge the system with a refrigerant other than R410A.
• Do not reuse recovered refrigerant.
• Use an electronic scale to measure the charging amount of refrigerant.
Adding more refrigerant than the specified 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.
71 31 11 Procedure for charging the system with refrigerant
1) Remove the charging cap from the liquid pipe.
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 hose and install the charging cap.
5) Remove the blank caps (gas pipe, liquid pipe), and open the valves.
6) Close the blank caps.
7) After adding refrigerant, indicate the added charging volume on the unit.
* Tighten the blank caps and charging caps to the torque values specified.
To open and close the valves, use an M4(5/32in.) hexagon wrench for liquid and gas pipes.
71 31 21 Calculating the amount of refrigerant charge to be added
• Round up the value to 2 decimal places.
Diameter of liquid
pipe
(mm (in1))
Φ6.35 (1/4)
Φ9.52 (3/8)
Calculation of additional amount for pipe length
Total length of
Φ9.52mm
L =
(Φ3/8in.)
liquid pipe
m (ft)
<Example>
If liquid pipe piping length is the following
Φ9.52 (3/8") : 20m, Φ6.35 (1/4") : 15m
Additional charge volume L=20(m)×0.058(kg/m)+15(m)×0.021(kg/m)
Φ9.52 (3/8") : 78ft, Φ6.35 (1/4") : 110ft
Additional charge volume L=78(ft)×0.624(oz./ft)+110(ft)×0.224(oz./ft)
En-24
Additional amount for
pipe length
(kg/m (oz1/ft))
0.021 (0.224)
0.058 (0.624)
Total length of
× 0.058
Φ6.35mm
kg/m
+
(Φ1/4in.)
(0.624
liquid pipe
oz./ft)
m (ft)
kg (oz.)
=1.475kg≒1.48kg
=48.672oz.+24.64oz.=73.312oz.≒73.31oz.
CAUTION
Total
× 0.021
kg/m
=
(0.224
oz./ft)
kg (oz.)
kg (oz.)