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25
Hose Clamp
3" Plastic Pipe
Adaptor Rubber Boot
Outer Clamshell Housing
3" x 3" x 2"
DWV Fitting
Piped To
External Air
Supply
Figure 15. Air Inlet Piping
Adaptor
Rubber Boot
Remove
Filter Media
Filter Media shown inside
the Outer Clamshell Housing
Outer Clamshell
Housing
NOTE: if found difficult to
reattach the outer clamshell
housing to the internal clamshell
housing - apply a thin layer of silicone
grease to the surface of the black rubber
support of the Filter Media.
Figure 16. Filter Media
DIRECT VENT AIR INTAKE MOISTURE PROTECTION
The air intake piping in a direct vent system will normally not
have any moisture accumulation in it. However, in certain cases,
moisture may build up and needs to be drained. Typical situations
include, but are not limited to:
• Cold outdoor temperature, particularly if the air inlet is short,
• Heater being used mostly for space heating,
• Air inlet pipe has vertical rise near the heater and,
• High outdoor humidity.
Installations with any of these conditions are required to provide
a moisture drain with a trap that flows to a waste drain. See
Figure 17. Install a drain tee assembly and a trap in the inlet
vent as close to the water heater as possible. This is to drain any
water that may be in the combustion air pipe and prevent it from
entering the blower. The drain tubing in any installation should
have a loop trap and flow to an appropriate waste drain. The air
intake drain line must be entirely separate from the exhaust vent
outlet condensate line.
INSTALL TEE FITTING AS CLOSE TO
WATER HEATER INTAKE AIR
CONNECTION AS POSSIBLE
INTAKE AIR CONDENSATE TEE INSTALLATION
FIELD SUPPLIED
3"x 3"x 1/2" TEE
WITH HOSE BARB
FITTING INSTALLED
FACTORY
INTAKE AIR
CONNECTION
INTAKE
AIR
PIPING
CONNECT FIELD
SUPPLIED FLEXIBLE
DRAIN HOSE TO BARB
FITTING AND FORM A
LOOP WATER TRAP IN
DRAIN HOSE
RUN DRAIN HOSE
TO SUITABLE FLOOR
DRAIN SEPARATELY FROM
OTHER CONDENSATE DRAINS
Figure 17
HORIZONTAL VENT TERMINAL INSTALLATION
NOTE: If you are installing your system so that it vents through the
roof, please refer to Vertical Vent Terminal Installation on Page 26.
1. A f t e r t h e p o i n t s o f t e r m i n a t i o n h a v e b e e n
determined (see Vent Pipe Termination on page 23)
use the cover plates as templates to mark the holes for
the vent pipes to be inserted through the wall. BEWARE OF
CONCEALED WIRING AND PIPING INSIDE OF WALL. If the
vent terminals are being installed on the outside of a finished
wall, it may be easier to mark both the inside and outside wall.
Align the holes by drilling a hole through the center of the
template from the inside through to the outside. The template
can now be positioned on the outside wall using the drilled
holes as a centering point for the template.
A.) MASONRY SIDE WALLS Chisel an opening approximately
1/2” (1.3 cm) larger than the marked circle.
B.) WOODEN SIDE WALLS Drill a pilot hole approximately
one quarter inch outside of the marked circle. This
pilot hole is used as a starting point for a saws-all or
sabre saw blade. Cut around the marked circle staying
approximately one quarter inch outside of the line.
(This will allow the vent pipe to easily slide through
the opening. The resulting gap will be covered by the
vent terminal cover plates.) Repeat this step on the
inside wall if necessary.
2. Cut a length of pipe about 3.5” (8.9 cm) longer than the
wall thickness at the opening.
3. Glue the air intake terminal to the section of the pipe.
4. Slide the wall plate over pipe to stop against air intake terminal.
5. Place a bead of caulking (not supplied) around the gap between
the pipe and the wall. Place some of the caulking on the
back of the plate to hold it against the wall after installation.
6. If the air intake pipe is installed up to the wall, with a coupling on the
end against the wall opening, the pipe with the air intake terminal can
be prepared for gluing before inserting through the wall. Slide the
pipe through the wall and insert into coupling on the other side of
the wall. See Figure 18 and Figure 19.
7. Refer to Figure 11 in “Vent Pipe Termination” for standard and
alternate vent termination dimensions.
8. Refer to Figure 20 below for the Alternate Horizontal Termination
installation.
Figure 18
Figure 19