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Recommendations and Requirements
When sizing and installing a vertical flue using metal flue
connectors and either metal flue pipe or a lined masonry
chimney, the following recommendations and requireĆ
ments should be considered in addition to those outlined
above:
1 - Accessories attached to the flue to reduce heat loss
and improve efficiency have not been tested for use
with this furnace.
2 - When the G24MCE furnace is replacing an existing
furnace, inspect the existing flue system for obstrucĆ
tions, corrosion and proper sizing.
3 - Make runs of single-walled or twin-walled metal pipe
used as flue connector easily accessible, so that it
can be inspected annually and cleaned and replaced
if necessary.
4 -
See the regulations that are in force in the counĆ
try of installation for flue connector sizing.
5 - When the vent connector must be located in or pass
through a crawl space or other areas which may be
cold, that portion of the vent connector shall be a
listed twinĆwall flue pipe or a pipe of a material having
equivalent insulation qualities.
6 - Secure all joints with at least two corrosion-resistant
screws. Check all accessible joints for gas tightness
after installation.
WARNING
Failure to properly seal flue system could allow carĆ
bon monoxide leakage resulting in injury or death.
7 - Make flue connector horizontal runs as short as posĆ
sible with a minimum number of elbows. One 90
°
elĆ
bow is equivalent to 1.5m (5 ft.) of straight pipe. One
45
°
elbow is equivalent to .75m (2.5 ft.) of straight
pipe.
8 - Horizontal runs of flue connector must rise at least
20mm per meter (1/4 in. per ft.)
away from the furĆ
nace.
9 - Horizontal run length must not represent more than 75
percent of the vertical rise of the flue system.
10 - Support horizontal runs of flue connector with straps or
hangers, so that there are no dips or sags.
11 - Support the flue connector at 1m (3 ft.) intervals and
at all elbows.
12 - If single wall flue is used, fasten the flue adapter to the
flue outlet of the furnace and the flue connector to the
flue adapter using one or two corrosion-resistant
sheet metal screws. If twin walled flue pipe is used,
fasten according to manufacturer's instructions
13 - Install first flue connector elbow a minimum of 6 in.
(152mm) from furnace flue outlet.
14 - Terminal location must not be within 600 mm (2 ft.) of
an openable window, air vent, or other ventilation
opening. Flue terminal must be located in accorĆ
dance with any national regulations applicable. A
flue guard must be fitted if required by the regulaĆ
tions.
15 - Fit a split flue socket immediately above the furnace
to facilitate servicing and maintenance.
16 - Flue pipes and fittings should be constructed of aluĆ
minium or stainless steel.
VERTICAL FLUE USING MASONRY CHIMNEY
The following additional requirements apply when a lined
masonry chimney is used to vent a G24MCE furnace:
See figure 15 for exterior chimney application.
Masonry chimneys that once served fireplaces cannot be
used for venting purposes unless the fireplace opening is
permanently sealed.
Tile-lined chimneys must be composed of a non-porous,
acid-resistant material. The internal diameter of the chimĆ
ney liner must not be less than the diameter of the furnace
flue adapter.
The G24MCE gas furnace must
not
be connected to a
chimney that is servicing a separate appliance which burns
solid fuel.
IMPORTANT
SINGLE appliance venting of a fanĆassisted furnace
into a tileĆlined masonry chimney (interior or outĆ
side wall) is PROHIBITED. The chimney must first
be lined with either twinĆwalled flue or an insulated
single wall flexible vent lining system, sized in acĆ
cordance with the the regulations in force in the
country of installation.
