12-99
12
30750B
R-CAST SERIES WALL FURNACE
B. Vertical Termination.
The following figures are the maximum
distances from the base of the unit, as well as the
minimum air space clearances that must be main-
tained: Maximum straight unsupported rise - 25 feet;
Maximum height - 40' from the base of the unit. maxi-
mum horizontal unsupported run - 3 feet; air space
clearances around vertical venting - 1" on all sides;
air space clearances around horizontal venting - 1
1
⁄
2
"
on top and
1
⁄
2
" on sides and bottom. If an elbow is
being used in an enclosed wall, floor or ceiling, a top
air space clearance of 3" must be maintained. These
clearances must be maintained at all times. In a ver-
tical termination every 1' of horizontal run requires at
least 2' of vertical rise. (Example: a 12' overall instal-
lation height may be offset as much as 6' horizontal-
ly.) The maximum is 20 feet. These clearances must
be maintained at all times.
1. Positioning the Heater.
Position the heater in its
desired location. Maintain all clearances found in
Figure 1 on page 8.
2. Preparing the Ceiling.
Drop a plum bob down
from the ceiling to the position of the heater flue exit,
and mark the location where the vent will penetrate
the ceiling. Drill a small hole at this point. Next, drop
a plumb bob from the roof to the hole previously
drilled in the ceiling, and mark the spot where the
vent will penetrate the roof. Determine if ceiling
joists, roof rafters, or other framing will obstruct the
venting system. You may wish to relocate the appli-
ance, or to offset to avoid cutting load bearing mem-
bers.
Note: For buildings with vinyl siding, a Vinyl
Siding Standoff should be installed between the
vent cap and the exterior wall. Attach the Vinyl
Siding Standoff to the Horizontal Vent Termination.
The Vinyl Siding Standoff prevents excessive heat
from possible melting the vinyl siding material.
Secure the connection between the vent pipe and the vent
cap by attaching the two sheet metal strips extending from
the vent cap assembly into the outer wall of the vent pipe.
Use the two sheet metal screws provided to connect the
strips to the Pipe Section. Bend any remaining portion of the
sheet metal strip back towards the vent cap, so it will be con-
cealed by the decorative wall thimble cover. See Figure 6.
Slide the decorative wall thimble up the wall surface and
attach with screws provided. Apply decorative brass or
chrome trim if desired. See Figure 7.
Figure 6
Insertion of Vent Pipe
Figure 8
Vinyl Siding Standoff
4. Vertical Rise on the Exterior.
For installations requiring a vertical rise on the exterior of the
building, 14-inch and 36-inch tall Snorkel Terminations are
available. Follow the same installation procedures that are
used for standard horizontal termination found in Step 4.
See Figure 8.
Figure 7
Decorative Wall Thimble
