John Wood Direct Vent Models No Longer in Production - Manual (Page 4)

III) VENT CONNECTIONS
After the location for the vent terminal has been selected
as outlined in Figure 3, use the following illustrations for
installation:
Figure 3A - Locating Clearance Hole For Vent.
Cut a clearance hole, approximately 178mm (7 in.) in
diameter, through the exterior wall for the vent assembly.
The minimum height should not be less than 1.72m (68 in.)
for Models 40BF and 50BF and not less than 1.93m (76
in.) for Model 50TBF, as measured from the hole center to
bottom of water heater. The maximum height recommend-
ed is 2.28m (90 in.) or in compliance with Figure 3M.
* Where the wall is combustible and the wall thickness is
over 356mm (14 in.), 25mm (1 in.) clearance to com-
bustible materials around the terminal pipe is needed. The
first 356mm (14 in.) is zero clearance.
Figure 3B - Moving Water Heater To Its Final Installed
Location.
Move the water heater to its final installed location. Make
certain clearances from combustible material are
observed. The maximum distance from center of water
heater to outside wall must not be more than 2.28m (90
in.).
Figure 3C - Vent Assembly.
The vent pipe and terminal are assembled by the manu-
facturer as shown in Figure 3C. There are springs fas-
tened inside the corrugated pipe. When the vent pipes
are pulled to a required length, the distances between the
springs will still be equally spaced.
Figure 3D - Securing Vent Termination Assembly To
The Exterior Wall.
Introduce the 152mm (6 in.) pipe through the clearance
hole from exterior wall then secure the vent terminal to
the exterior wall with 4 screw anchors appropriate for the
type of wall construction. Caulk the junction of the vent
terminal base plate and the exterior wall with exterior type
silicone sealant.
Figure 3E - Pull The 80mm (3-1/8 in.) And 152mm (6
in.) Corrugated Pipe Towards The Water Heater
Individually.
1. Pull the 80mm (3-1/8 in.) corrugated pipe towards the
water heater and leave some length over the water
heater’s center for bending.
2. Pull the 152mm (6 in.) corrugated pipe toward the
water heater and leave it 25mm (1 in.) shorter than
80mm (3-1/8 in.) pipe.
3. Make sure there are two springs evenly spaced at the
bend in the pipe.
4. Use metal hangers to keep vent pipe level or with a
slope upward from the heater to terminal.
Figure 3F
Bend the 80mm (3-1/8 in.) and 152mm (6 in.) corrugated
pipe all together toward the water heater’s flue connec-
tion.
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178mm (7 in.)
DIAMETER
MINIMUM
(SEE TEXT)
BOTTOM OF HEATER
MAX. 2.28m
(90 in.) 76mm
(3 in.)
102mm
(4 in.)
102mm
(4 in.)
WALL
CLAMP SPRING
SEALANT
REDUCER
H
SPRING