John Wood Direct Vent - Manuel (Page 22)

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VENT ASSEMBLY
The vent piping and the vent termination hood are to be
connected as shown in Figure 19.
Maintain vent clearances to combustibles as shown in
Figure 20.
Depending on your access to where the vent termination
passes through the wall, you may wish to connect the
piping and vent termination hood together fi rst.
Inside the vent piping there are springs that hold the two
corrugated pipes in position. When the pipes are stretched
to the required length, the springs will remain properly
spaced.
To connect the vent piping to the vent termination hood,
fi rst slide the inner (3”) corrugated pipe over the inner vent
termination pipe. Continue this action until the locking
clip on the corrugated pipe snaps into position in the
corresponding groove (see Figure 18). Secure corrugated
pipe with screw (supplied) inserted through hole opposite
the locking clip.
Repeat this process with the outer (6”) corrugated pipe and
lock it into position on the outer pipe on the vent termination
(see Figure 18). Secure corrugated pipe with screw
(supplied) inserted through hole opposite the locking clip.
Note: To reduce the friction between the corrugated pipe
and the O-rings, it is recommended to dampen the O-rings
with water.
The completed connection is shown in Figure 19.
INNER
CORRUGATED PIPE
INNER VENT
TERMINATION PIPE
OUTER VENT
TERMINATION PIPE
O-RING
OUTER
CORRUGATED
PIPE
LOCKING CLIP
GROOVE
LOCKING
CLIP
Figure 18
SCREW
Figure 19
SECURING VENT TERMINATION ASSEMBLY TO
THE EXTERIOR WALL
Some models are supplied with trim plates which may
be used to cover the holes in the wall (see Figure 1 and
Figure 20). Slide one trim plate (if supplied) over the outer
corrugated tube, then insert the outer corrugated tube
through the clearance hole from exterior wall. Secure
the trim plate to the exterior wall, then secure the vent
terminal to the exterior wall with 4 screw anchors (included)
appropriate for the type of wall construction. Caulk the
junction of the vent terminal base plate and the exterior
wall with exterior type sealant (not included). Slide the trim
plate (inside) over the outer corrugated tube and fasten the
trim plate to the interior wall. Caulk the junction of the outer
corrugated tube and the trim plate (inside) with suitable
sealant. The vent termination hood attaches to the vent
piping as shown in Figure 19.
TRIM PLATE
(INSIDE)
TRIM PLATE
(OUTSIDE)
APPLY
SEALANT
SPRING
CUTAWAY TO
SHOW SPRING
PLACEMENT
APPLY
SEALANT
356mm
(14”) ZERO
CLEARANCE
25mm (1”)
CLEARANCE
Figure 20
VENT RESTRICTER PLATE
The vent restricter plate (see Figure 21) is required for
short horizontal runs on low vent installations (see Figure
28) and high vent installations (see Figure 29).
For short horizontal vent runs (see Figure 28) place the
restricter plate over the fl ue tube reducer before connecting
the inner corrugated tube to the fl ue tube reducer. DO NOT
use the restricter plate if the horizontal run is greater than
762mm (30”).
For high vertical runs use the restricter plate only when
the vertical run of the venting above the heater is greater
than 1.21m (48”) (see Figure 29).
UPPER AIR
INLET BOX
FLUE TUBE
REDUCER
RESTRICTER
PLATE
Figure 21
UNCOMPRESSING THE CORRUGATED TUBING
1. Pull the inner corrugated tube towards the water heater
and leave some length over the water heater’s center
for bending (see Figure 22).
2. Pull the outer corrugated tube toward the water
heater and leave it 50mm (2”) shorter than the inner
corrugated tube.
3. Make sure there are two springs evenly spaced at the
bend in the tube.
4. Use metal hangers to keep venting level or with a
slope upward from the heater to terminal.