Table of Contents
z Selection of pipe size
*a
Liquid pipe
3/8"
(9.52)
(9.52)
in. (m)
Gas pipe
3/4"
(19.05)
(19.05)
in. (m)
Length ft. (m)
196 (60)
49 (15)
Example
¾ Pipe size "a" selection : The length that between outdoor unit and the farthest indoor unit.
a + b + c + f3 =326 ft. (100 m) > 295 ft. (90m)
Therefore Gas pipe must be size up from 5/8" (15.88 mm) to 3/4" (19.05 mm). (Refer 2-3. PIPE
SIZE)
z Limitation check
Total pipe length
Between outdoor unit and farthest indoor unit
Between the first separation tube and the farthest indoor unit
Between outdoor unit and the nearest indoor unit
Between outdoor unit and the first separation tube
z Calculation of additional charge refrigerant
1. Calculation of additional amount for pipe length
Liquid pipe size
in. (m)
Additional refrigerant
lbs./ft. (kg/m)
Liquid pipe length
ft. (m)
A = (0.039 x 311) + (0.014 x 164) = 14.48 (lbs.)
[(0.058 x 95) + (0.021 x 50) = 6.56 (kg)]
2. Factory charged amount
Outdoor unit
B = 11.7 (lbs.)
[5.30 (kg)]
3. Total refrigerant amount check
C = A + B = 14.48 + 11.7 = 26.18 (lbs.) < 34.61 (lbs.) → OK
[6.56 + 5.30 = 11.86 (kg) < 15.70 (kg) → OK]
Check pipe length and height difference between units by comparing with items shown in "2-2.PIPING
LIMITATION".
b
b1
c
3/8"
3/8"
1/4" (6.35)
(9.52)
3/4"
1/2"
5/8"
(12.70)
(15.88)
32 (10)
49 (15)
3/8"
1/4"
(9.52)
(6.35)
0.039
0.014
(0.058)
(0.021)
312 (95)
165 (50)
Factory charged
Model
amount lbs. (kg)
AOU48
11.7 (5.30)
d
e1
e2
3/8"
1/4" (6.35) 1/4" (6.35) 1/4" (6.35) 1/4" (6.35) 1/4" (6.35)
(9.52)
5/8"
1/2"
1/2"
(15.88)
(12.70)
(12.70)
16 (5)
32 (10)
16 (5)
Diagram
Total
a+b+c+f3
b+c+f3
a+b1
a
- (06 - 25) -
f1
f2
1/2"
1/2"
(12.70)
(12.70)
32 (10)
16 (5)
Example
Limitation
ft. (m)
ft. (m)
475 (145) 590 (180) or less
328 (100) 393 (120) or less
131 (40)
131 (40) or less
229 (70)
16 (5) or more
196 (60)
9 (3) or more
f3
1/2"
(12.70)
32 (10)
Judge
OK
OK
OK
OK
OK
- Quick Links:
- Outdoor Unit
- Indoor Unit
- Controller
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