Design Technical Manual

Table Of Contents
2) 2pipes
2a 2b 2c 2d 2e 2f 2g 2h 2i 2j 2k
Liquid pipe
in. (mm)
1/4
(6.35)
3/8
(9.52)
3/8
(9.52)
3/8
(9.52)
1/4
(6.35)
1/4
(6.35)
3/8
(9.52)
3/8
(9.52)
3/8
(9.52)
3/8
(9.52)
3/8
(9.52)
Gas pipe
in. (mm)
1/2
(12.70)
3/4
(19.05)
3/4
(19.05)
5/8
(15.88)
1/2
(12.70)
1/2
(12.70)
3/4
(19.05)
3/4
(19.05)
3/4
(19.05)
3/4
(19.05)
3/4
(19.05)
Length ft. (m)
Example
33
(10)
27
(8)
16
(5)
16
(5)
27
(8)
27
(8)
33
(10)
33
(10)
16
(5)
16
(5)
16
(5)
z
Calculation of additional charge refrigerant
1. Calculation of additional amount for outdoor unit
Model
Additional amount for
outdoor unit
lbs.(kg)
Outdoor unit1 AOUA96 6.61 (3.00)
Outdoor unit2 AOUA96 6.61 (3.00)
Outdoor unit3 AOUA96 6.61 (3.00)
A = 6.61 + 6.61 + 6.61 = 19.83 (lbs.)
[3.00 + 3.00 + 3.00 = 9.00 (kg)]
2. Calculation of additional amount for pipe length
Liquid pipe size
3/4
(19.05)
5/8
(15.88)
1/2
(12.70)
3/8
(9.52)
1/4
(6.35)
Additional refrigerant
lbs./ft. (kg/m)
0.18 0
(0.268)
0.120
(0.178)
0.077
(0.114)
0.039
(0.058)
0.014
(0.021)
Liquid pipe length
ft. (m)
197
(60)
73
(22)
37
(11)
214
(65)
86
(26)
B = (0.180 x 197) + (0.120 x 73) + (0.077 x 37) + (0.039 x 214) + (0.014 x 86) = 56.37 (lbs.)
[(0.268 x 60) + (0.178 x 22) + (0.114 x 11) + (0.058 x 65) + (0.021 x 26) = 25.57 (kg)]
3. Calculation of additional charge refrigerant
C = A + B = 19.83 + 56.37 = 76.20 (lbs.)
[9.00 + 25.57 = 34.57 (kg)]
4. Calculation of factory charged amount
Model
Factory charged
amount (kg)
lbs.(kg)
Outdoor unit1 AOUA96 26.01 (11.80)
Outdoor unit2 AOUA96 26.01 (11.80)
Outdoor unit3 AOUA96 26.01 (11.80)
D = 26.01 + 26.01 + 26.01 = 78.03 (lbs.)
[11.80 + 11.80 + 11.80 = 35.40 (kg)]
5. Total refrigerant amount check
E = C + D = 76.20 + 78.03 = 154.23 (lbs.) < 231.49 (lbs.) → OK
[34.57 + 35.40 = 69.97 (kg) < 105.00 (kg) → OK]
Check pipe length and height di󰀨erence between units by comparing with items shown in "2-2.
LIMITATION".
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