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Selection of pipe size
a a1 b b1 c c1 d d1 e e1
Liquid pipe
in. (m)
3/8"
(9.52)
1/4" (6.35)
3/8"
(9.52)
1/4" (6.35)
3/8"
(9.52)
1/4" (6.35)
3/8"
(9.52)
1/4" (6.35)
3/8"
(9.52)
1/4" (6.35)
Gas pipe
in. (m)
3/4"
(19.05)
1/2"
(12.70)
3/4"
(19.05)
1/2"
(12.70)
3/4"
(19.05)
1/2"
(12.70)
5/8"
(15.88)
1/2"
(12.70)
5/8"
(15.88)
1/2"
(12.70)
Length ft. (m)
Example
131 (40) 49 (15) 16 (5) 32 (10) 16 (5) 32 (10) 16 (5) 32 (10) 16 (5) 32 (10)
f f1 g g1 h
Liquid pipe
in. (m)
3/8"
(9.52)
1/4" (6.35)
3/8"
(9.52)
1/4" (6.35) 1/4" (6.35)
Gas pipe
in. (m)
5/8"
(15.88)
1/2"
(12.70)
5/8"
(15.88)
1/2"
(12.70)
1/2"
(12.70)
Length ft. (m)
Example
16 (5) 32 (10) 16 (5) 32 (10) 22 (7)
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Limitation check
Diagram
Example
ft. (m)
Limitation
ft. (m)
Judge
Total pipe length Total 498 (152) 590 (180) or less OK
Between outdoor unit and farthest indoor unit a+b+c+d+e+f+g+h 252 (77) 393 (120) or less OK
Between the rst separation tube and the farthest indoor unit b+c+d+e+f+g+h 121 (37) 131 (40) or less OK
Between outdoor unit and the nearest indoor unit a+a1 180 (55) 16 (5) or more OK
Between outdoor unit and the rst separation tube a 131 (40) 9 (3) or more OK
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Calculation of additional charge refrigerant
1. Calculation of additional amount for pipe length
Liquid pipe size
in. (m)
3/8"
(9.52)
1/4"
(6.35)
Additional refrigerant
lbs./ft. (kg/m)
0.039
(0.058)
0.014
(0.021)
Liquid pipe length
ft. (m)
230 (70) 270 (82)
A = (0.039 x 230) + (0.014 x 270) = 12.75 (lbs.)
[(0.058 x 70) + (0.021 x 82) = 5.79 (kg)]
2. Factory charged amount
Model
Factory charged
amount lbs. (kg)
Outdoor unit AOU60 11.7 (5.30)
B = 11.7 (lbs.)
[
5.30 (kg)]
3. Total refrigerant amount check
C = A + B = 12.75 + 11.7 = 24.45(lbs.) < 34.61 (lbs.) → OK
[5.79 + 5.30 = 11.09(kg) < 15.70 (kg) → OK]
Check pipe length and height dierence between units by comparing with items shown in "2-2.PIPING
LIMITATION".
- (06 - 23) -
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