Fujitsu AOU48RLXFZ Design & Technical Manual page 179

Limitation check
Total pipe length
Between outdoor unit and the farthest indoor unit
Between outdoor unit and branch boxes
Between branch box and indoor unit
Between outdoor unit and the first separation tube
Calculation of additional charge refrigerant
Liquid pipe size
in. (mm)
Additional refrigerant
oz./ft. (g/m)
Liquid pipe length
ft (m)
Additional charge = (0.224 x 117) + (0.624 x 173) = 134.16 oz. = 8.39 lbs
[Additional charge = (21 x 36) + (58 x 53) = 3830 g = 3.83 kg]
Diagram
Total
a + b + c + l
a + b + c + d + e
Total f + i + l
Each unit f, i, l
a
1/4 3/8
(6.35) (9.52)
0.224 0.624
(21) (58)
117 173
(36) (53)
- (06 - 25) -
Example Limitation
ft (m) ft (m)
290
Less than 377 (115)
(89)
180
Less than 230 (70)
(55)
173
Less than 180 (55)
(53)
117
Less than 197 (60)
(36)
39 Between 10 to 49
(12) (3 to 15)
23
Greater than 16 (5)
(7)
6. SYSTEM DESIGN
Judge
OK
OK
OK
OK
OK
OK