PEX Installation Manual

51
IM-PF 724596 0416
Z-type expansion offset:
The Z-type expansion offset integrates two 90° elbows that form a “Z” pattern.
With this type of configuration ½ of the “L” dimension is applied to the center area of the “Z” (represented
as L1 in the table and illustration) while ¼ of the “L” dimension would be applied to each of the top and
bottom areas (represented as L2).
Calculate the necessary L1 and L2 dimensions or use the chart below, which was figured using the
maximum run for a single expansion compensator (50 feet).
L = 20.7"
L1 = ½ (L)
L1 = 20.7"/2 = 10.35"
L1 = 10.35"
L2 = ¼ (L)
L2 = 20.7"/4 = 5.18"
L2 = 5.18"
Z- Type Expansion Offset (in)
per 50 linear feet of run
Tubing
∆T(°F)
Tube
nom.
60 80 100 120 140 160 180 200
L1 L2 L1 L2 L1 L2 L1 L2 L1 L2 L1 L2 L1 L2 L1 L2
ViegaPEX
&
ViegaPEX
Ultra
¾" 10.2 5.1 11.8 5.9 13.2 6.6 14.4 7.2 15.6 7.8 16.7 8.3 17.7 8.8 18.6 9.3
1" 11.6 5.8 13.4 6.7 15.0 7.5 16.4 8.2 17.7 8.8 18.9 9.5 20.1 10.0 21.1 10.6
1¼" 12.8 6.4 14.8 7.4 16.5 8.3 18.1 9.1 19.6 9.8 20.9 10.5 22.2 11.1 23.4 11.7
1½" 13.9 7.0 16.1 8.0 18.0 9.0 19.7 9.8 21.3 10.6 22.7 11.4 24.1 12.1 25.4 12.7
2" 15.9 8.0 18.4 9.2 20.5 10.3 22.5 11.3 24.3 12.2 26.0 13.0 27.6 13.8 29.1 14.5
L1 = 10.35"
L2 = 5.18"
L2 = 5.18"
Illustration of Example
Figure 16.2 Z-Type Expansion
Table 16.3 Z-Type Expansion
Anchor Point
Anchor Point
L2
L2
LT
L1
Z-Type Offset
∆L
∆L