Horizontal Installation - Vermont Castings RADVTCB Homeowner's Installation And Operating Manual

The Cathedral Ceiling Support (CCS) may be used in
pitched or flat ceiling installations and comes with a sup-
port collar and a decorative two part square trim plate. In-
stall by inserting the support box down through the framed
joist opening (end with round hole first) in the ceiling using
tin snips, cut the corners of the open end of the box such
that the sides can be folded down over the top of the joist
framing members. Nail the folded sides to the top of the
framing. (Fig. 37)
Fig. 37 Support box.
A two-part square trim plate is provided to give a finished
look once installed. Simply fit the two halves of the trim
plate around the cathedral ceiling support box hanging
below the ceiling (overlapping if necessary) and screw
them to the ceiling. Both the ceiling support and cathedral
ceiling support can support a maximum of 40' (1 m) of
pipe.
Offsets:
If any offsets are necessary in the vertical system, an Off-
set Support (OS) should be installed directly above the
upper elbow of the offset. Install by attaching the offset
support band to the pipe with two #8 x 1/4" sheet metal
screws (minimum ) and secure the offset support straps
to surrounding structure. (Fig. 38)
Offset Support
Strap
Fig. 38 Offset support.
30004967
Two Part Square
Trim Plate
Support Box
Support Box Collar
ST96
Nail to top of
framing
Offset Support
Collar
ST97
Radiance
Supporting DIRECT-TEMP: Horizontal Support
Horizontal runs of Direct-Temp should be supported ev-
ery 4' (1 cm) of pipe. This can be done with the use of
plumbers strapping or the offset support.
Adjustable Length (AJ)
An Adjustable Length is available to accommodate in-
stallations where non-standard lengths are necessary.
The adjustable length telescopes down over a standard
length of pipe and provides an extension range of 3Z\x"
(89 mm) to 10Z\x" (67 mm). Install by sliding the inlet end
of the adjustable length over the outlet end of a standard
length of pipe. After positioning the adjustable length ap-
propriately, secure it to the standard length with two ()
#8 x 1/4" sheet metal screws (provided). Seal the area
between both the top and bottom of the adjustable length
outer wall and the outer wall of the standard length with
an approved silicone sealant.
Fire Stopping
DIRECT-TEMP must be firestopped wherever it passes
through floors, ceiling or walls. The only location where
a firestop is not required is at the roof level. Both vertical
support components with trim plates provide for firestop-
ping. The wall thimble also acts as a firestop. AT other
locations, a firestop spacer (FS) should be installed. In
the attic the firestop should be placed on top of the joist
framing to prevent debris from falling into the joist fram-
ing. (Fig. 39)
Firestop (FS)
Placed on Top
of Framed
Opening
Attic Framing
(No floor)
Fig. 39 Firestop spacer.

Horizontal Installation

1. Determine the appliance location. Refer to the appli-
ance manufacturer's installation instructions for clearance
to combustible requirements, termination options, number
of elbows, maximum length, etc. Then position the appli-
ance and plan vent routing accordingly. Consider locating
the appliance in a place where there will be no interference
with wall studs, electrical wiring, conduit, plumbing pipe or
other obstructions. The termination should be located at
least 1" (305 mm) (Fig. 40) above grade, remain above
the snow line in geographical areas that accumulate snow
and be away from traffic areas such as walkways if it is
Direct Vent Gas Heater
®
Maintain at Least
Minimum Clearance to
Combustibles, Wire and
Insulation
ST98
3