York R-410A, Technical & Service Manual, Page: 267 / 385

Installation
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4.7) Additional charge of refrigerant
Procedure
1. The refrigerant needed by the pipes installed on fields is not filled in the factory.
After finishing installation, add refrigerant when the length of liquid pipe on field is over 0 m.
2. Calculate the refrigerant to be supplemented in light of the connecting length of liquid
pipe of indoor unit and outdoor unit and pipe diameter.
Calculation
R-410A
Diameter of Liquid Pipe
Equivalent Refrigerant for Pipe Length of 1m (kg/m)
Φ
6. 4 0.022
Φ
9. 5 0.060
Φ
12. 7 0.110
Φ
15. 9 0.170
Φ
19. 1 0.250
Φ
22. 2 0.350
Φ
25. 4 0.520
Φ
28. 6 0.680
Calculating formula of refrigerant to be recharged (R410A):
Local refrigerant to be recharged R (Kg) = (L1×0. 022 kg/m) + (L2×0. 060 kg/m) + (L3×0. 110
kg/m) + (L4×0.170 kg/m) + (L5×0. 250 kg/m) + (L6×0. 350 kg/m) + (L7×0. 520kg/m) + (L8×0.
680kg/m)
Note: Conversion of the equivalent length: Convert into the direct pipe length According to
branch Junction 0.5m/l.
Where:
L1—Actual total length of ▯6.4 liquid pipe (m) L2—Actual total length of ▯9.5 liquid pipe (m)
L3—Actual total length of ▯12.7 liquid pipe (m) L4—Actual total length of ▯15.9 liquid pipe (m)
L5—Actual total length of ▯19.1 liquid pipe (m) L6—Actual total length of ▯22.2 liquid pipe (m)
L7—Actual total length of ▯25.4 liquid pipe (m) L8—Actual total length of ▯28.6 liquid pipe (m)
Caution:
For different series of air conditioning system, the calculating formula of refrigerant to be
supplemented might be different, so it is necessary to checkup the “formula in installation
Calculate refrigerant volume according to liquid pipe
length
Recharge refrigerant