John Wood Envirosense Power Direct Vent (May 2010 or later) - Manuel (Page 32)

32
CONCENTRIC VENT INSTALLATION
This water heater is certified for concentric venting with concentric
vent kit #9006328005. Follow instructions below for proper
installations.
Table 8 – KIT COMPONENTS
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 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: 24
Figure: 25
* Dimension 21 1/8 in. may be lengthened to 60 in. maximum.
Dimension 21 1/8 in. may also be shortened by cutting the
pipes, provided in the kit, to 12 in. minimum.
** Dimension 39 will change accordingly as dimension
21 1/8 in. is lengthened or 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
1. Determine best location for termination kit.
NOTE: Roof termination is preferred since it is less
susceptible to damage, has reduced chances to intake contaminants,
and less visible vent vapors.
2. Cut 1 hole (5 in. diameter)
3. Partially assemble concentric vent termination kit.
a) Cement Y concentric fitting to larger diameter kit
pipe, see Figure 24.
b) Cement rain cap to smaller diameter kit pipe, see Figure 26.
Figure: 26
NOTE: Instead of cementing the smaller pipe to the rain cap, a
field-supplied stainless steel screw may be used to secure the
2 components together when field disassembly is desired for
cleaning, see Figure 26.
When using alternate screw method, drill clearance hole in rain
cap and pilot hole in vent pipe for screw size being used. 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.
4. Install Y concentric fitting and pipe assembly through
structure’s hole and field supplied roof boot/flashing.
Figure: 27