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W415-0788 / A / 09.22.09
Example 8:
V
1
= 1.5 FT
V
2
= 5 FT
V
T
= V
1
+ V
2
= 1.5 + 1 + 5 = 6.5 FT
H
1
= 1 FT
H
2
= 1 FT
H
3
= 10.75 FT
H
R
= H
1
+ H
2
+ H
3
= 1 + 1 + 10.75 = 12.75 FT
H
O
= .03 (four 90° elbows + one 45° elbow - 90°)
= .03 (360° + 45° - 90°) = 6.75 FT
H
T
= H
R
+ H
O
= 12.75 + 6.75 = 19.5 FT
H
T
+ V
T
= 19.5 + 6.5 = 26 FT
Formula 1:
H
T
< 3 V
T
3 V
T
= 3 x 6.5 = 19.5 FT
19.5 = 19.5
Formula 2:
H
T
+ V
T
< 40 FT
26 < 40
Since both formulas are met, this vent configuration is acceptable.
90°
V
1
V
2
H
1
H
2
90°
90°
H
3
45°
18.2_3
4.1 ORIFICE REPLACEMENT
REAR VENT TERMINATION:
In rear exit installations with no vertical vent run, the BTU input must
be reduced to 21,000 BTU by changing the orifi ce.
In order to access the orifi ce, the log support secured by two screws,
must be removed.
Care should be taken not to damage the gas pipe. When removing
the orifi ce, using a 9/16" socket wrench, a 7/8" back-up wrench must
be used on the manifold, located below the housing, to ensure that
the aluminum tubing does not twist or kink.
4.0 INSTALLATION PREPARATION - MODEL GDS60
FIGURE 3.11e
FIGURE 4.1a
FIGURE 4.1b