Panasonic U-72MF1U9 Technical Data Manual page 35

2. System Design
Additional refrigerant charge before extension
Liquid tube Tubing length (ft)
diameter
La ø1/2
Lb ø3/8
LA ø3/4
LB ø1/2
LC ø1/2
LD ø1/2
LE1 ø3/8
LG ø5/8
LH ø3/8
L1 ø3/8
L2 ø1/4
L3 ø1/4
L7 ø3/8
L8 ø1/4
L9 ø1/4
Additional refrigerant charge after extension
Liquid tube Tubing length (ft)
diameter
LE2 ø3/8
LF ø3/8
L4 ø3/8
L5 ø3/8
L6 ø1/4
Calculation of additional refrigerant charge for the entire 3WAY VRF system
(Additional refrigerant charge for entire 3WAY VRF system)
= (Refrigerant charge at outdoor unit) + (Additional refrigerant charge)
= 881 + 341 = 1222 oz (after extension)
[Before extension: 458 + 297 = 755 oz]
Remark:
When planning an extension model, be sure to include the values of the Table 2-1-1 (Page 2-5) Necessary Amount of
Refrigerant Charge per Outdoor Unit.
Additional refrigerant charge
(A) per 1 ft (oz/ft) (B)
6.6 1.38
65.6 0.602
26.2 2.78
19.7 1.38
19.7 1.38
19.7 1.38
16.4 0.602
26.2 1.99
13.1 0.602
9.8 0.602
9.8 0.279
9.8 0.279
9.8 0.602
9.8 0.279
13.1 0.279
Total (oz)
Additional refrigerant charge
(A) per 1 ft (oz/ft) (B)
13.1 0.602
16.4 0.602
13.1 0.602
19.7 0.602
23.0 0.279
Total (oz)
(A) × (B) oz
9.055
39.501
72.966
27.165
27.165
27.165
9.875
52.231
7.900
5.925
2.746
2.746
5.925
2.746
3.661
296.775 297 oz
(A) × (B) oz
7.900
9.875
7.900
11.850
6.407
43.934 44 oz
2 - 21
Design of 3WAY VRF SYSTEM
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