Bosch SM Series Installation, Operation And Maintenance Manual page 17

SM Split AH/AV Air Handler
Refrigerant Charge, Line Sizing, and Capacity Multiplier Chart
Factory
System R410A
Models Charge
(Oz)*
SM024
80
SM036
86
SM048
88
SM060
115
CAPACITY MULTIPLIER
EXAMPLE 1:
Model SM036 with 45 ft. of equivalent length of 3/8" O.D.
Liquid Line.
Total System Charge= Factory Charge + (45 ft. - 25 ft.) x .60
oz./ft.
Total System Charge = 93 oz. + (20 ft. x .60 oz./ft.) = 105 oz.
Additional 12 oz. of R410A refrigerant required.
Table 8 Refrigerant Charge, Line Sizing, and Capacity Multiplier Chart
Liquid Line Charge per Linear Foot
LIQUID LINE
SIZE, O.D.
R410A OZ
PER FOOT
Table 9 Liquid Line Charge per Linear Foot
SM Split AH/AV Air Handler
Refrigerant Line O.D. Size (Based on Equivalent Line Length)
25 FT. 36 FT.
LIQ. SUC. LIQ. SUC.
3/8 3/4 3/8 3/4
3/8 3/4 3/8 3/4
3/8 7/8 3/8 7/8
3/8 1–1/8 3/8 1–1/8
1.00 0.995
1/4 5/16
.25 .44
Subject to change without prior notice
45 FT. 50 FT.
LIQ. SUC. LIQ. SUC.
3/8 3/4 3/8
3/8 3/4 3/8
3/8 7/8 3/8
3/8 1–1/8 3/8 1–1/8
0.990 0.990
EXAMPLE 2:
Model SM060 with 10 ft. of equivalent length of 3/8" O.D.
Liquid Line.
Total system charge= Factory charge + (25 ft. -10 ft.) x .60 oz./ft.
Total System Charge = 150 oz. + (15 ft. x .60 oz./ft.) = 141 oz.
Additional 12 oz. of R410A refrigerant required.
3/8
.60
Refrigerant Lines | 17
Suction
75 FT.
Riser
LIQ. SUC.
3/4 3/8 7/8
7/8 3/8 7/8
7/8 3/8 7/8
3/8 1–1/8
0.980
1/2 5/8
1.15 1.95
8733826256 (2020/06)
Line
Max.
3/4
3/4
7/8
7/8