Lennox G60UHV Series Installation Instructions Manual page 15

Common Venting Using Tile-Lined Interior Masonry Chimney and Combined Vent Connector
J
MINIMUM LENGTH = AS SHORT AS PRACTICAL. _N/ I I INTERIOR TILE=LINED
FOR MAXIMUM LENGTH SEE NOTE TO LEFT I I [ I MASONRY CHIMNEY
NOTE- Refer to provided venting tables I I J
for installations in the USA and the i= =" I ] I ]J
venting tables in current CSA-B149 for F 1 ! 'l IJ_ _ _"_
installations in Canada. _ ' I _ F_ 4--4 [/_ ]
H I ........... _ I A _ I NOTE-thechimneymustbeproperly
H _T L-_-- --_ I _ I ] sizedperprovided venting tables or
_ __ _ _ lined with llsted metal llning system.
I I
FURNACE
I
VENT I
I I _
CONNECTOR I I_
A p_THAENRc E ._ SEE NOTE 1 BELOW iiiMANDN_INTLYL A CE
NOTE - Either single-walled or double-walled vent connector may be used. Refer to the capacity requirements as shown in the pro-
vided venting tables for installations in USA and the venting tables in current CSA-B149 for installations in Canada.
FIGURE 18
DO NOT insulate the space between the liner and the Do not install a manual damper, barometric draft regulator,
chimney wall with puffed mica or any other loose gran-
ular insulating material
klMPORTANT
A fan-assisted furnace may be commonly vented into an
existing lined masonry chimney if the following conditions
are met:
• The chimney is currently serving at least one drafthood
equipped appliance
• The vent connectors and chimney are sized according
to the provided venting tables for the USA, and the ap-
propriate venting tables in the standards of CSA B149
Natural Gas and Propane Installation Codes in Cana-
da.
If type B1 double-wall vent is used inside a chimney, no oth-
er appliance can be vented into the chimney. The outer wall
of type B1 vent pipe must not be exposed to flue products.
A type B1 vent or masonry chimney liner shall terminate
above the roof surface with a listed cap or a listed roof as-
sembly according to the terms of their respective listings
and the vent manufacturer's instructions.
When inspection reveals that an existing chimney is not
safe for the intended purpose, it shall be rebuilt to conform
to nationally recognized standards, lined or relined with
suitable materials, or replaced with a gas vent or chimney
suitable for venting G60UHV(X) series units. The chimney
passageway must be checked periodically to ensure that it
is clear and free of obstructions.
or flue restrictor between the furnace and the chimney.
Never connect a Category I appliance to a chimney that is
servicing a solid-fuel appliance. If a fireplace chimney flue
is used to vent this appliance, the fireplace opening must
be permanently sealed.
A type B or listed chimney lining system that passes
through an unused masonry chimney flue is not considered
to be exposed to the outdoors.
General Venting Requirements
Vent all G60UHV(X) furnaces according to these instruc-
tions:
1 - Vent diameter recommendations and maximum allow-
able piping runs are found in the provided venting tables
for the USA, and the appropriate venting tables in the
standards of CSA B149 Natural Gas and Propane
Installation Codes for Canada.
2 - In no case should the vent or vent connector diameter
be less than the diameter specified in the provided
venting tables for the USA, and the appropriate venting
tables in the standards of CSA B149 Natural Gas and
Propane Installation Codes for Canada.
3 - The minimum vent capacity determined by the sizing
tables must be less than the low fire input rating and the
maximum vent capacity must be greater than the high
fire input rating.
4 - Single appliance vents - If the vertical vent or tile-lined
chimney has a larger diameter or flow area than the
vent connector, use the vertical vent diameter to de-
termine the minimum vent capacity and the vent
connector diameter to determine the maximum vent
capacity, The flow area of the vertical vent, however,
shall not exceed 7 times the flow area of the listed ap-
pliance categorized vent area, drafthood outlet area or
flue collar area unless designed according to approved
engineering methods.
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