Amana VCA Service Instructions Manual page 49

SERVICING
Known Factors:
1. RCC48A2A and CCA48TUA coil. Evaporator above
Condenser.
2. Liquid Line 65 linear feet w/ 8 short radius elbows, and
30 ft. vertical lift.
3. Suction Line 65 linear feet w/ 8 long radius elbows.
Determine Suction and Liquid Line sizes:
Procedures:
A. Measure length of suction line. (65 ft.)
B. Count the number of suction line elbows. (8 long radius)
C. Calculate the equivalent length of fittings using the
Fitting Losses in Equivalent Feet Chart. (Calculate using
the recommended suction line size for each unit, and
long radius elbows.) 8 x 1.7 = 13.6 equivalent feet.
D. Add suction line length (A) and equivalent feet of fittings
(C). 65 + 13.6 = 78.6 effective feet.
E. The total effective length of Suction Line is 78.6 feet.
Refer to the Suction Line Sizing Chart to determine the
actual suction line required. (1 1/8")
F. Measure liquid line length. (65 ft.)
G. Count the number of liquid line elbows. (8 short radius)
H. Calculate the equivalent length of fittings using the
Suction Line Elbow chart on page 47. ( Calculate using
the recommended liquid line size for each unit.)
8 x 1.2 = 9.6 equivalent feet.
I. Add liquid line length (F), equivalent feet of fittings (H).
65 + 9.6 = 74.6 effective feet.
J. The total effective length of liquid line is 74.6 ft. Refer to
the Liquid Line Sizing Chart (Evaporator Above Con-
densing Unit) to determine the liquid line size. 75
effective feet with 30 ft. lift will require a 1/2" liquid line.
K. To determine the additional charge required, multiply the
linear feet of liquid line to the refrigerant correction
factor, and subtract the factory charge for the line set.
65 x 1.3 = 84.5
25 x .60 = 15.0
= 69.5 oz. additional charge
20'
10'
5'
10'
LIQUID LINE
5'
SUCTION LINE
2'
10'
3'
49 Rev 1