Vermont Castings RADVTCB Homeowner's Installation And Operating Manual page 24

Radiance ® Direct Vent Gas Heater
less than 7' (.1 m) high. Refer to Pages 11, 1, Figures
11, 1 for more detail.
Window Well
Maintain "
(51 mm)
Clearance
Below Snorkel
Adequate
Drainage as per
Local Codes
Fig. 40 Below grade installation.
. Assemble the pipe (and elbow if using) and attach it to
the appliance. Plan for a level to 1/4" per foot rise (6 mm
per 305 mm) (from inlet to outlet) in the horizontal system
if not specified by the appliance manufacturer. Horizontal
runs should be supported every 4' (1 cm).
3. Push the appliance near the desired location. Determine
the centerpoint of the penetration by locating the centerline
of the outlet of the pipe with respect to the wall.
4. Frame an opening to the dimension specified in the
Framing Dimension Table 1. Ensure the centerline of the
pipe lines up with the center of the prepared opening un-
less otherwise specified by the appliance manufacturer.
NOTE: As a general rule, the wall thimble is optional in
the U.S. However, there may be some manufacturers that
require it. Contact the appliance manufacturer for infor-
mation if uncertain. When installed in Canada, a wall
thimble is required on all installations in which the
vent passes through a combustible wall.
5. If required, install the outside half of the wall thimble
(WT) through the opening and screw or nail in place. (Fig.
41) Seal around the perimeter of the thimble face plate on
the exterior wall using an RTV silicone sealant to provide
protection from possible rain infiltration. (Fig. 41)
NOTE: The wall thimble accommodates wall thickness-
es of 4Z\x" (114 mm) to 7Z\x" (191 mm). If a larger range
is needed due to a thicker wall, it is permissible to field
fabricate a metal sleeve extension and attach it to the
shields.
6. Install the horizontal termination to the exterior wall
using four (4) all purpose screws through the holes lo-
cated at each corner of the termination. Make sure the ar-
row (embossed on the front of the termination) is pointing
up. (Fig. 4) If the house has vinyl siding, a Vinyl Siding
Standoff (VS) must be installed prior to installing the hori-
44
Snorkel Termination
1" (305 mm) Minimum
Clearance Above Grade Level to
Air Intake
Grade Level
Sloped Away
From Building
ST99
Wall Thimble
Shield
Wall
Thimble
Shield
Wall
Thimble
Face
Plate
Fig. 41 Wall thimble.
Fig. 42 Horizontal termination.
zontal termination. Refer to the appliance manufacturer
to determine if one is recommended. Attach the vinyl sid-
ing standoff to the exterior side of the wall (making sure
it is level and centered with respect to the opening) with
screws (provided) at each corner of the standoff. Attach
the horizontal termination to the standoff. (Fig. 43)
If the wall is brick or concrete, and contains no combus-
tible material, a 7" (178 mm) round penetration hole is ad-
Horizontal Termination
Fig. 43 Vinyl siding standoff and horizontal termination.
ST932
Selkirk standoff
6/07
Seal with RTV
Silicone Sealant
on Exterior side
here (around
perimeter)
Wall Thimble
Face Plate
ST930
Horizontal Termination
ST931
Vinyl Siding Standoff
ST93
30004967