Osburn Designer DV36, Инструкция по установке и эксплуатации

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Figure 3.7 (below) shows an installation in which there is a vertical rise V
1
off the back of unit, followed by a
90
o
elbow, a horizontal run H
1
, another 90
o
elbow, and a horizontal run H
2
to the vent termination. In this
example the equivalent length of the first 90
o
elbow would be 2 horizontal feet; the second 90
o
elbow would
have an equivalent horizontal length of
4
feet. If in this example the design of the system is constrained by the
vertical run V
1
and the horizontal run H
2
, then the Figure 3.5 would be used to determine the maximum
horizontal run H1 allowable in order for the appliance to properly function.
In this example if V
1
were to be 3 ½ feet, then by again referring to Figure 3.5 it can be determined that for a
vertical rise of 3 ½ feet the maximum horizontal run must be 10 feet.
H
T
= H
1
+ H
Equivalent
+ H
2
= 10 feet
Where H
Equivalent
= 2 + H
1
+ 4 + H
2
Therefore H
1
+ H
2
= 10 – 6
= 4 feet.
Therefore in order for this system to be viable the total horizontal length H
1
+ H
2
must not exceed 4 feet.
Figure 3.6 – Example 1
Figure 3.7 – Example 2
Determining Allowable Vent Configurations Determining Allowable Vent Configurations