199 Rev. 3
SERVICING
REFRIGERANT LINE SIZING
Known Factors:
1. RCC36A2A and matching "A" coil. Condenser above
Evaporator.
2. Liquid Line 72 linear feet w/ 9 long radius elbows
3. Suction Line 72 linear feet, and 43 ft. vertical lift.
Determine Suction and Liquid Line sizes:
Procedures:
A. Measure length of suction line. (72 ft.)
B. Measure the vertical lift of the suction line (43'). Using
the Suction Line Traps Chart determine the number of
traps required in the suction line (3). Count the number
of suction line elbows. (12 long radius)
C. Calculate the equivalent length of fittings using the Fitting
Losses in Equivalent Feet Chart. (Calculate using the rec-
ommended suction line size for each unit.) 12 x 1.7 =
20.4 equivalent feet.
D. Add suction line length (A) and equivalent feet of fittings
(C). 72 + 20.4 = 92.4 effective feet.
E. The total equivalent length of Suction Line is 92.4 feet.
Refer to the Suction Line Sizing Chart to determine the
actual suction line required. (Since 92.4' is greater than
75' but less than 100', use the 100' column). A 7/8" Suc-
tion line will be adequate.
F. Measure liquid line length. (72 ft.)
G. Count the number of liquid line elbows. (9 long radius)
H. Calculate the equivalent length of fittings using the Fitting
Losses in Equivalent Feet Chart. (Calculate using the rec-
ommended liquid line size for each unit.)
9 x .8 = 7.2 equivalent feet.
I.
Add liquid line length (F) equivalent feet of fittings (H). 72
+ 7.2 = 79.2 effective feet.
J. The total effective length of liquid line is 79.2 ft. Refer to
the Liquid Line Sizing Chart (Condensing Unit Above
Evaporator) to determine the liquid line size. 79.2 effec-
tive feet will require a 3/8" 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.
72 x .60 = 43.2
25 x .60 = 15.0
= 28.2 oz. additional charge
SUCTION LINE
LIQUID LINE
5'
2'
2'
40'
20'
3'
3rd Trap
2nd Trap
1st Trap
