Installation & Service Manual
16
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 - Negative Draft
Figure 2-6_Unit with Fan Assisted Venting
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.
Fan Assisted Venting
A Power Venter Kit is available on Models 45,000 - 135,000 Btu/hr only
(see Table 2B).
TABLE - 2B
VENT MATERIALS
Kit
Number
Input
Btu/hr
Material
KIT3103
45,000
PVC Rated (CPVC Optional)
75,000
PVC Rated (CPVC Optional)
KIT3104
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
2
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 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.
Содержание CBN045
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