3- Inallcases,securetheplenumtothetop flanges of the
furnace using sheet metal screws.See figure 13.
PLENUM.._._ JSECURE
._ HEMMED EDGE
FIGURE 13
4 - In closet installations,it may be necessary to install
sheetmetalscrewsfrom the inside.Ifthis isthe case,
make plenumwitha removablefront to installscrews
as shownin figure 14.
a _ PLENUM
SECURE FROM .jl_
,NSIDE_,_._ HEMMED EDGE
FIGURE t4
: ::_:i_:::_:::_::'::::iii%::_:.iiii::iiiiiiiiii'ii'::iiii ::ii_ii'ii_i::ii'i_=:i'==:i"i_i'i'i?i_i'iii_i;i_iii'i_i'i':.:iiiiii::%::i":::.i i:.i'
.V mg ...................................................................................................................................................................
A vent adapter is factory-installed on the combustion air
blower outlet of all models, except the G24M-140. On the
G24M-140, the flue adapter is supplied with the furnace,
and must be field-installed, between the combustion air
blower flueouUetand the vent connector, using one or two
corrosion-resistant screws. Modification of or failure to
install the adapter will cause unsafe unit operation and
will void AGA and CGA unit certification, The vent con-
nectordoes not require insulation.
The G24M sedes units are classified as fan-assisted Cate-
gory tfurnaces when vertically vented according to the btest
edition of ANSI Z21.47 Central Fumaca Standard in the
USA and the current standards of CAN/CGA B149.1 and
B149.2 of the Natural Gas and Propane Installation Code in
Canada. A fan-assisted Category Ifurnace is an appliance
equipped with anintegral mechanical means to eitherdraw
or force productsof combustion through the combustion
chamber and/or heat exchanger.
NOTE - Use these instructions as e guide. They do not su-
persedelocal codes.
The vent sizingtables in this manual were extracted from
the National Fuel Gas Code (NFPA 54 /ANSI Z223.1 ) end
are provided as a guide for proper vent installation. Proper
application,termination, construction and location of vents
must conform to local codes having jurisdiction. In the ab-
senceof local codes,the NFGC servesas thedefiningdoc-
ument.
Referto the tablesand theventinginformationcontained in
theseinstructionsto properlysize and installthe venting
system.
Installthe first ventconnectorelbowa'minimumof 6 inches
(152 ram) fromthe furnace vent outlet.
Venting Using a Masonry Chimney
The following additional requirements apply when a lined
masonry chimney is used to vent an G24M furnace.
Masonry chimneys used to vent Category I central fur-
naces must be either tile-lined or lined with e listed metal
lining system or dedicated gas vent. Unlined masonry
chimneys are prohibited. See figures 15 and 16 for com-
mon venting.
A Category I appliance must never be connected to a chim-
ney that is servicing e solid-fuel appliance. If a fireplace
chimney flue is used to vent this appliance, the fireplace
opening must be permanently sealed.
A fan-assisted fumaca may be commonly vented into an
existing lined masonry chimney if the following conditions
are met:
1 - The chimney is currently serving at least one draft-
hood equipped appliance.
2 - The vent connectors end chimney are sized according
tothe provided venting tables for the USA, and the ap-
propriate venting tables in the standards of CAN/CGA
B149.1 and B149.2 of the Natural Gas and Propane
Installation Code in Canada.
A type B1vent or mascnry chimney Itoershallterrninatsabove
the roofsurfacawithe listedcap or a listed roof assemblyac-
cordingto the terms oftheir respective listingsand thevent
manufacturer'sinstrucfions.
Do notinstalla manualdamper, barometric draft regulator,
or flue restdctor between the furnace and the chimney.
If type B1 double-wall vent is used insidee chimney, no oth-
er appliance can be vented into the chimney. Outer wall of
type B1 vent pipe must not be exposed to flue products.
Insulation for the flexible vent pipe must be an encapsu-
lated fiberglass sleeve recommended by the flexiblevent
pipe manufacturer. See figure 15.
The space between the liner and the chimney wail
should NOT be insulated with puffed mica or any other
loose granular insulating material.
If B1 ventor an insulated flexiblevent pipe cannot be used
as liners, the chimney must be rebuilt to accommodate one
of these methods or some alternate approved method
must be found to ventthe appliance.
When inspection reveals that an existingchimney is not safe
for_e intended purpose, it shall be rebuilt to conformto na-
tionally recognized standards, linedor relined with suitable
materials or replaced with e gas vent or chimney suitablefor
venting G24M seriesunits. The chimney passageway must
be checked periodically to ensure that it is clear and free of
obstructions.
Page 12
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