Concentric Vent Installation - A.O. Smith 300 Series Instruction Manual

CONCENTRIC VENT INSTALLATION

This water heater is certified for concentric venting with concentric
vent kit #100111100. Follow the instructions below for proper
installations.
Table 7. Concentric Vent Kit Components
Item
Rain Cap
SDR-26 pipe
SDR-26 pipe
Y Concnetric Fitting
Installation Instructions
Field supplied pipe and fittings are required to complete the
installation.
This concentric vent termination kit may be used with 3 inch diameter
pipe systems.
SAFETY CONSIDERATIONS
Installing and servicing water heating equipment can be hazardous
due to gas and electrical components. Installation and service of
the concentric vent termination requires ability equivalent to that of
a qualified installer or qualified service technician. See Qualifications
(page 7). All precautions in the literature, on tags, and labels
attached to the unit must be observed.
Follow all safety codes. Wear safety glasses and work gloves.
Figure 30. Concentric Termination Components
Figure 31. Concentric Termination Dimensions
* Dimension 19.50 in. may also be shortened by cutting the pipes, pro-
vided in the kit, to 12 in. minimum.
** Dimension 36.10 will change accordingly as dimension 19.50 in. is
shortened.
Do not use field-supplied couplings to extend pipes. Airflow restriction
will occur and the heater pressure switch may cause intermittent
operation.
INSTALLATION VERTICAL ROOF TERMINATION
Determine best location for termination kit.
1.
Note: Roof termination is preferred since it is less susceptible
to damage, has reduced chances to intake contaminants,
and less visible vent vapors.
Description Qty.
3 in. 1
4 in. dia.
1
2 1/2 in. dia.
1
3 in. 1
196151 1
Cut one hole (5 in. diameter).
2.
Partially assemble concentric vent termination kit.
3.
A. Cement Y concentric fitting to larger diameter kit pipe. See
Figure 33.
B. Cement rain cap to smaller diameter kit pipe. See Figure 33.
Figure 32. Securing Rain Cap with Screw
Note: Instead of cementing the smaller pipe to the rain cap,
a stainless steel screw may be used to secure the 2
components together when field disassembly is desired
for cleaning. See Figure 32. Locate the drill location dimple
on the outside of the rain cap; at this location, drill a 3/16"
hole through the cap and the inner pipe wall with the
path of the hole perpendicular to the inner pipe NOT the
outside of the cap; insert the screw and tighten the bolt;
do not over tighten.
When using alternate screw method, failure to drill adequate
holes may cause cracking of PVC components, allowing
combustion products to be recirculated. Failure to follow this
warning could result in personal injury or death.
Do not operate the heater with rain cap removed or recirculation
of combustion products may occur. Water may also collect inside
larger combustion-air pipe and flow to the burner enclosure.
Failure to follow this warning could result in product damage
or improper operation, personal injury or death.
Install Y concentric fitting and pipe assembly through structure's
4.
hole and field supplied roof boot/flashing.
Figure 33. Installing Concentric Termination Assembly on a Roof
Note: Do not allow insulation or other materials to accumulate
inside pipe assembly when installing through hole.
Secure assembly to roof structure as shown in Figure 33 using
5.
field supplied metal strapping or equivalent support material.
Note: Ensure termination height is above the roof surface or
anticipated snow level as shown in Figure 33 .
Install rain cap and small diameter pipe assembly in roof
6.
penetration assembly, Ensure small diameter pipe is cemented
and bottomed in Y concentric fitting.
31
STAINLESS STEEL
SCREW AND NUT