Install Instructions

2 Venting (continued)
Installation & Service Manual
Masonry Chimney Installation
A masonry chimney must be properly sized for the installation
of a gas fired appliance. Venting of an appliance into a cold
or oversized masonry chimney can result in op er a tion al and
safety problems. Exterior masonry chim neys, with one or
more sides exposed to cold out door tem per a tures, are more
likely to have venting problems. The temperature of the flue
gases from an appliance may not be able to suf fi cient ly heat
the ma son ry structure of the chim ney to generate proper
draft. This will result in condensing of flue gases, damage
the masonry flue/tile, insufficient draft and possible spill age
of flue gases into an occupied living space. Care ful ly in spect
all chimney systems before installation. If there is any doubt
about the sizing or condition of a masonry chimney, it must
be relined with a prop er ly sized and approved chimney liner
system.
Inspection of a Masonry Chimney
A masonry chimney must be carefully inspected to determine
its suitability for the venting of flue gas es. A clay tile lined
chimney must be structurally sound, straight and free of
misaligned tile, gaps between liner sections, missing sections
of liner or any signs of con den sate drainage at the breaching
or clean out. If there is any doubt about the condition of a
masonry chimney, it must be relined. An unlined masonry
chimney must not be used to vent flue gases from this
appliance. An unlined chimney must be relined with an
approved chimney liner system when a new appliance is be ing
attached to it. Metallic liner systems (Type “B” double wall
or flexible or rigid metallic liners) are recommended. Consult
with local code officials to determine code requirements or
the advisability of using or relining a masonry chimney.
Sidewall Venting
This appliance is NOT approved for sidewall venting with
the negative draft venting system as shipped from the factory.
An induced draft fan MUST be used if the installation
requires that the flue gases be vented out a sidewall. A
properly sized and in stalled induced draft fan may also be
used to vent the flue gases ver ti cal ly if required by job site
conditions. The induced draft fan must be listed by a nationally
recognized test agency, be properly sized and installed per the
rec om men da tions of the in duced draft fan manufacturer and
meet local code requirements. Use care to ensure that the
me chan i cal ly supplied draft does not exceed the range of a
negative 0.02 to 0.05 inches water column to ensure proper
operation. If draft exceeds the spec i fied range, the fan must be
adjusted or the installation of a baro met ric damper in the flue
may be required to prop er ly control draft.
An induced draft fan MUST be interlocked into the appliance’s
control circuit to start when the appliance calls for heat. The
in duced draft fan MUST also be equipped with a prov ing
switch, properly interlocked into the ap pli ance’s con trol circuit
to prove fan operation before the main burn ers are allowed
to fire. A vertical or sidewall vent termination for an induced
draft fan MUST be in stalled per the recommendations of the
fan manufacturer and provide proper clearances from any
combustion or ventilation openings, win dows, doors or other
open ings into the building. All induced draft fan in stal la tions
must comply with local code requirements. See FIG. 2-7 for
minimum sidewall venting clearances.
TABLE 2B - VENT MATERIALS
Kit
Number
Input
Btu / hr
Material
100157734
90,000 CPVC Rated
135,000 CPVC Rated
Minimum Vent Length = 12 Equivalent Feet *
(ALL UNITS)
Maximum Vent Length = 25 Equivalent Feet * *
(ALL UNITS)
*Equivalent Feet: 90° Elbow = 5 Feet
45° Elbow = 3 Feet
Figure 2-6_CW135 with Fan Assisted Venting
Fan Assisted Venting
A Power Venter kit is available on models 90,000 - 135,000
Btu/hr, water heaters only.
DO NOT use Radel or cellular (foam) core
PVC or CPVC pipe.
CAUTION
NOTE: In Canada, CPVC and PVC vent pipe,  ttings and
cement/primer must be ULC-S636 certi ed.
⚠ WARNING
DO NOT insulate PVC or CPVC venting
materials. Use of insulation will cause
increased vent wall temperatures, which
could result in vent pipe failure.
17
All CPVC and PVC vent pipes must be
glued, properly supported, and the exhaust
NOTICE
must be pitched a minimum of 1/4" per foot back to the water
heater (to allow drainage of condensate). Horizontal runs
shall have supports suitable for non-metallic vent piping that
do not clamp tightly onto vent allowing for vent expansions or
contraction. Supports shall be as close to joints and fittings as
practical and no more than 5 ft. apart.
When available, follow all vent
manufacturer's installation instructions.
NOTICE