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Tecumseh AH5540E
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81
Cond. Unit
CAPACITY
(Btu/h)
Line Size, Type L Copper OD (in)
SUCTION LINE SIZE OD (in)
Line Length, Equivalent Feet
Velocity
= 1500
fpm*
LIQUID LINE SIZE OD (in)
Line Length, Equivalent Feet
Velocity
= 100
fpm*
DISCHARGE LINE SIZE OD (in)
Line Length, Equivalent Feet
Velocity
= 1500
fpm*
10 25 50 100 10 25 50 100 10 25 50 100
1,000 1/4 5/16 5/16 3/8 1/4 3/16 3/16 3/16 3/16 ~ 3/16 3/16 1/4 1/4 ~
2,000 5/16 3/8 3/8 1/2 5/16 3/16 3/16 1/4 1/4 3/16 1/4 1/4 1/4 5/16 3/16
3,000 3/8 3/8 1/2 1/2 3/8 3/16 1/4 1/4 1/4 1/4 1/4 1/4 5/16 5/16 3/16
4,000 3/8 1/2 1/2 5/8 3/8 3/16 1/4 1/4 5/16 1/4 1/4 5/16 5/16 3/8 1/4
6,000 1/2 1/2 5/8 5/8 1/2 1/4 1/4 5/16 5/16 5/16 5/16 5/16 3/8 1/2 5/16
8,000 1/2 5/8 5/8 3/4 1/2 1/4 5/16 5/16 3/8 5/16 5/16 3/8 3/8 1/2 5/16
10,000 1/2 5/8 3/4 3/4 5/8 1/4 5/16 5/16 3/8 3/8 3/8 3/8 1/2 1/2 3/8
12,000 1/2 5/8 3/4 7/8 5/8 1/4 5/16 3/8 3/8 3/8 3/8 1/2 1/2 1/2 3/8
18,000 5/8 3/4 7/8 1 1/8 3/4 5/16 3/8 3/8 1/2 1/2 1/2 1/2 1/2 5/8 1/2
24,000 3/4 7/8 7/8 1 1/8 7/8 5/16 3/8 1/2 1/2 1/2 1/2 1/2 5/8 5/8 1/2
30,000 3/4 7/8 1 1/8 1 1/8 7/8 3/8 1/2 1/2 1/2 5/8 1/2 5/8 5/8 3/4 1/2
36,000 3/4 7/8 1 1/8 1 3/8 1 1/8 3/8 1/2 1/2 5/8 5/8 1/2 5/8 3/4 3/4 5/8
48,000 7/8 1 1/8 1 1/8 1 3/8 1 1/8 1/2 1/2 5/8 5/8 3/4 5/8 3/4 3/4 7/8 3/4
60,000 1 1/8 1 1/8 1 3/8 1 3/8 1 3/8 1/2 1/2 5/8 5/8 7/8 5/8 3/4 7/8 1 1/8 7/8
Table 5-8: R-404A Refrigerant Line Sizes, -10°F Evap Temp, 40°F Suction Vapor Temp, 105°F Condensing and Liquid Temp
1,000 5/16 3/8 3/8 1/2 5/16 3/16 3/16 3/16 3/16 ~ 3/16 1/4 1/4 1/4 ~
2,000 3/8 1/2 1/2 5/8 3/8 3/16 3/16 1/4 1/4 3/16 1/4 1/4 1/4 5/16 3/16
3,000 1/2 1/2 5/8 5/8 1/2 3/16 1/4 1/4 1/4 1/4 1/4 5/16 5/16 5/16 1/4
4,000 1/2 5/8 5/8 3/4 1/2 1/4 1/4 1/4 5/16 1/4 5/16 5/16 5/16 3/8 1/4
6,000 1/2 5/8 3/4 7/8 5/8 1/4 1/4 5/16 5/16 5/16 5/16 3/8 3/8 1/2 5/16
8,000 5/8 3/4 3/4 7/8 3/4 1/4 5/16 5/16 3/8 3/8 3/8 3/8 1/2 1/2 3/8
10,000 5/8 3/4 7/8 1 1/8 7/8 1/4 5/16 3/8 3/8 3/8 3/8 1/2 1/2 1/2 3/8
12,000 3/4 7/8 7/8 1 1/8 7/8 5/16 5/16 3/8 1/2 3/8 3/8 1/2 1/2 5/8 3/8
18,000 3/4 7/8 1 1/8 1 1/8 1 1/8 5/16 3/8 1/2 1/2 1/2 1/2 1/2 5/8 5/8 1/2
Table 5-7: R-404A Refrigerant Line Sizes, 20°F Evap Temp, 40°F Suction Vapor Temp, 105°F Condensing and Liquid Temp
* Largest line size that will maintain the stated refrigerant velocity. Please consult industry references such as the ASHRAE Refrigeration Handbook for additional infor-
mation regarding how to properly size suction and discharge line risers and condenser to receiver condensate lines.

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