7.2.1.7 Support
Apply primer to pipe and fitting surfaces. Do not allow primer to
puddle inside the system.
Apply a first coat of cement on the pipe O.D. Apply a full even layer
of cement for a distance slightly greater than the depth of the socket
of the coupler (fitting).
Coat the coupler (fitting) socket with a medium layer of cement,
avoiding puddling inside the system.
Apply a second full even layer of cement on the pipe O.D.
Join Pipe and Coupler (fitting)
Assemble pieces quickly while cement is fluid. Insert the pipe into the
coupler (fitting) until it touches the socket bottom. Turn the pipe a quarter
turn. Hold the joint together until the pipe will not pull out.
Clean excessive cement from the exterior. A properly made joint will
have a continuous bead of cement around the perimeter.
a)
b)
c)
d)
5.
Vent Pipe Support
- For continued safe operation, the vent system must
be properly supported. A ten-foot (3M) length of pipe weighs 20 pounds
(9kg) and has an expansion rate of four times that of metal pipe.
Horizontal CPVC or PVC vent must be supported every six feet (1.8M).
The hangers should provide as much bearing surface as possible and must
be free of sharp edges and burrs. Hangers must allow the pipe to expand
laterally. Consider pipe expansion when placing hangers. Changes in pipe
direction will allow for expansion. Hangers must be placed to allow for some
direction movement. The slip joint at the concentric adapter is designed to
permit some limited expansion. DO NOT USE THE HEATER OR CON
-
CENTRIC ADAPTER BOX TO PROVIDE VENT PIPE SUPPORT.
For a vertical CPVC or PVC vent, it is recommended that an engineer
design the vertical support system. An acceptable support for a simple ver-
tical vent that is 30 feet (9.1M) or less and rises closely from the heater is
illustrated in
FIGURE 10
. DO NOT USE THE HEATER OR CONCENTRIC
ADAPTER TO PROVIDE VENT PIPE SUPPORT.
Combustion Air Pipe Support
- Support a single-wall metal horizontal
combustion air run every six feet (1.8M). Support a vertical single-wall
metal combustion air pipe in accordance with accepted industry practices.
The heater and concentric adapter box may be used to support a vertical
combustion air pipe.
FIGURE 10 - To allow for
expansion, use a field-
supplied cradle-type
vent pipe support
Cradle Support
3 to 6 inches
(76 to 152mm)
Maximum length 6 ft (1.8M) for single support
3/8” threaded rod
attached to building
structural member
Vertical single-wall
combustion air pipe may be
supported by the heater and
the concentric adapter box.
Model
UEAS
Vertical V
ent
Sweep-type
elbow only
Slope a horizontal run downward slightly
toward the vent condensate drain at the heater.
Form I-UEAS, P/N 221232 R6, Page 17
