Design Technical Manual

Table Of Contents
z
Calculation of additional charge refrigerant
1. Calculation of additional amount for outdoor unit
Model
Additional amount for
outdoor unit
lbs.(kg)
Outdoor unit1 AOUA120 14.99 (6.80)
Outdoor unit2 AOUA96 6.61 (3.00)
A = 14.99 + 6.61 = 21.60 (lbs.)
[6.80 + 3.00 = 9.80 (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)
0
197
(60)
128
(39)
217
(66)
0
B = (0.120 x 197) + (0.077 x 128) + (0.039 x 217) = 41.96 (lbs.)
[(0.178 x 60) + (0.114 x 39) + (0.058 x 66) = 18.95 (kg)]
3. Calculation of additional charge refrigerant
C = A + B = 21.60 + 41.96 = 63.56 (lbs.)
[9.80 + 18.95 = 28.75 (kg)]
4. Calculation of factory charged amount
Model
Factory charged
amount
lbs.(kg)
Outdoor unit1 AOUA120 26.01 (11.8 0)
Outdoor unit2 AOUA96 26.01 (11.80)
D = 26.01 + 26.01 = 52.02 (lbs.)
[11.80 + 11.80 = 23.60 (kg)]
5. Total refrigerant amount check
E = C + D = 63.56 + 52.02 = 115.58 (lbs.) < 231.49 (lbs.) → OK
[28.75 + 23.60 = 52.35 (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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