Fujitsu AUYG18LVLB Design & Technical Manual page 199

¢ If additional refrigerant is required
When the piping is longer than pre-charge length, additional charging is necessary.
1. Remove the charging cap from the liquid pipe.
2. Attach a charging pipe 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 table be-
low.
4. Remove the charging hose and install the charging cap.
5. Remove the body caps (gas pipe and liquid pipe), and open the valves.
6. Close the body caps.
NOTES:
• Tighten the body caps and charging caps to the torques values specified in the following
table.
Blank cap (mm [in])
• To open and close the valves,
– Use an M5 hexagon wrench for liquid pipes.
– Use an M10 hexagon wrench for gas pipes.
 Pre-charge length
2-5. Additional charge calculation
6.35 (1/4)
9.52 (3/8)
12.70 (1/2)
15.88 (5/8)
19.05 (3/4)
Piping length (L1) pre-charge (m)
Tightening torque (N•m [kgf•cm])
20 to 25 (200 to 250)
20 to 25 (200 to 250)
28 to 32 (280 to 320)
30 to 35 (300 to 350)
35 to 40 (350 to 400)
30
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2. Pipe design