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2
Venting
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.
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 - Negative Draft
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 unless a power venter is used, see Fan Assisted
Venting. 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 jobsite re stric tions. 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.
16
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
Exterior masonry
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.
Fan Assisted Venting
A Power Venter Kit is available on Models 45,000 - 135,000
Btu/hr only (see Table 2B).
Number
KIT3103
KIT3104
Figure 2-6_Unit with Fan Assisted Venting
Installation & Service Manual
TABLE - 2B
VENT MATERIALS
Kit
Input
Btu/hr
45,000
75,000
90,000
135,000
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
Material
PVC Rated (CPVC Optional)
PVC Rated (CPVC Optional)
CPVC Rated
CPVC Rated
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