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DESCRIPTION
Total Extension of Pipe
(Liquid Pipe)
Distance Between Outdoor
Units
Piping Length
Furthest Piping Length L
Furthest Equivalent Piping Length From the First Y-Joint
L1
Height Between Outdoor
Height
and Indoor Unit H1
Difference
Height Between Indoor Units H2
CONDITION
If distance from the first Y-joint to the last Y-
joint (pipes C+E+d) is ≥ 131 ft or ≤ to 295 ft
Fig. 21 —Piping Lengths and Drop Height
Table 7 — Permitted Pipe Lengths and Drop Heights
Actual Length
Actual Length
Equivalent Length
Actual Length
Outdoor Unit Above
Outdoor Unit Below
Table 8 — Extending Pipe Diameters
PIPES TO INCREASE
B, C, D, E
ALLOWABLE VALUE (ft)
3280
13
≤ 738
≤ 656
≤ 131 / 295
164
131
98
INCREASED PIPE SIZE
→
ø
/
in.
ø
/
in.
3
1
8
2
→
ø
5
/
in.
ø
3
/
in.
8
→
4
ø
7
/
in.
ø 1
1
/
8
8
→
ø 1
3
/
in.
ø 1
5
8
14
PIPES
La + Lb + Lc + Ld + A + (B + C + D
+ E) x 2 + a + b + c + e + f
La, Lb, Lc, and Ld
La + Ld + A + C + E + d
C + E + d
---
---
---
→
ø
/
in.
ø
/
in.
1
5
2
8
→
ø
3
/
in.
ø
7
/
in.
4
→
8
in.
ø 1
1
/
in.
ø 1
3
/
in.
8
8
/
in.
8
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