SYSTEM OPERATION
13
For furnaces being converted to LP gas, it is strongly recom
-
mended that a LPLP03 kit also be installed. The use of this
kit will prevent the furnace from firing when the LP gas supply
pressure is too low to support proper combustion.
High altitude installations may require both a pressure switch
and an orifice/spring change. These changes are necessary
to compensate for the natural reduction in the density of both
the gas fuel and the combustion air at higher altitude.
For installations above 7000 feet, please refer to the furnace
Specification Sheets for required kit(s).
Contact the distributor for a tabular listing of appropriate
manufacturer’s kits for propane gas and/or high altitude instal
-
lations. The indicated kits must be used to insure safe and
proper furnace operation. All conversions must be performed
by a qualified installer, or service agency.
VENT / FLUE PIPE & COMBUSTION AIR PIPE
This manual will refer to the pipe that discharges products of
combustion to the outdoors as the “vent” pipe or “flue” pipe.
The pipe that supplies air for combustion to the furnace will
be referred to as the “intake” pipe or “combustion air” pipe. A
condensing gas furnace achieves its high level of efficiency by
extracting almost all of the heat from the products of combus
-
tion and cooling them to the point where condensation takes
place. Because of the relatively low flue gas temperature and
water condensation requirements, PVC or ABS are typically
used venting and intake pipe materials. In Canada ABS is not
an approved vent pipe material but it is permissible to use as
combustion air pipe material.
In addition to PVC and ABS pipe and fittings, Innoflue
®
by Cen
-
trotherm Eco Systems and PolyPro
®
by M&G Duravent are also
approved vent and combustion air materials for installations in
the U.S.A. and Canada. Manufacturers Installation instructions
for these products must be followed. These products have
specific instructions for installing, joining and terminating. Do
not mix materials or components of one manufacturer with
materials or components of another manufacturer.
All furnaces are manufactured with 2" vent / intake pipe and
connectors. For furnaces requiring installation of 3" pipe, the
transition from 2" to 3" should be done as close to the furnace
as practically possible.
This furnace must not be connected to Type B, BW, or L vent
or vent connector, and must not be vented into any portion
of a factory built or masonry chimney except when used as
a pathway for PVC as described later in this section. Never
common vent this appliance with another appliance or use
a vent which is used by a solid fuel appliance. Do not use
commercially available “no hub connectors” other than those
shipped with this product.
It is the responsibility of the installer to follow the manufac
-
turers’ recommendations and to verify that all vent/flue piping
and connectors are compatible with furnace flue products.
Additionally, it is the responsibility of the installer to ensure
that all piping and connections possess adequate structural
integrity and support to prevent flue pipe separation, shifting,
or sagging during furnace operation.
U
PON
COMPLETION
OF
THE
FURNACE
INSTALLATION
,
CAREFULLY
INSPECT
THE
ENTIRE
FLUE
SYSTEM
BOTH
INSIDE
AND
OUTSIDE
OF
THE
FURNACE
TO
ASSURE
IT
IS
PROPERLY
SEALED
. L
EAKS
IN
THE
FLUE
SYSTEM
CAN
RESULT
IN
SERIOUS
PERSONAL
INJURY
OR
DEATH
DUE
TO
EXPOSURE
TO
FLUE
PRODUCTS
,
INCLUDING
CARBON
MONOXIDE
.
WARNING
F
AILURE
TO
FOLLOW
THESE
INSTRUCTIONS
CAN
RESULT
IN
BODILY
INJURY
OR
DEATH
. C
AREFULLY
READ
AND
FOLLOW
ALL
INSTRUCTIONS
GIVEN
IN
THIS
SECTION
.
WARNING
DUAL CERTIFICATION: NON-DIRECT/DIRECT VENT
This furnace is dual certified and may be installed as a non-di
-
rect vent (single pipe) or direct vent (dual pipe) appliance.
A
non-direct vent
installation requires only a vent/flue pipe,
while a
direct vent
installation requires both a vent/flue pipe
and a combustion air intake pipe. Refer to the appropriate
section for details concerning piping size, length, number of
elbows, furnace connections, and terminations.
MATERIALS AND JOINING METHODS
Two-three-inch nominal diameter PVC Schedule 40 pipe
meeting ASTM D1785, PVC primer meeting ASTM F656,
and PVC solvent cement meeting ASTM D2564 specifi
-
cations must be used. Fittings must be DWV type fittings
meeting ASTM D2665 and ASTM D3311. Carefully follow the
manufacturer’s instructions for cutting, cleaning, and solvent
cementing of PVC.
The use of Schedule 40 PVC cellular core DWV meeting
ASTM F891-1 or ABS cellular core (Foam Core) plastic pipe
is also acceptable as a flue/vent and intake pipe material.
PVC primer meeting ASTM F656 and PVC solvent cement
meeting ASTM D2564 specifications must be used. Fittings
must be DWV type fittings meeting ASTM D2665 and ASTM
D3311. Carefully follow the manufactures instructions for
cutting, cleaning and solvent cementing of PVC.
For Canadian installations; field supplied PVC venting mate
-
rials must be UL S636 listed.
NOTE
: Requirement does not apply to the combustion air
pipe.
As an alternative to PVC pipe, primer, solvent cement, and
fittings, ABS materials which are in compliance with the fol
-
lowing specifications may be used. Two-or-three-inch ABS
Schedule 40 pipe must meet ASTM D1527 and, if used in
Canada, must be CSA listed. Solvent cement for ABS to
ABS joints must meet ASTM D2235 and, if used in Canada,
must be CSA listed. The solvent cement for the PVC to ABS
transition joint must meet ASTM D3138. Fittings must be DWV
type fittings meeting ASTM D2661 and ASTM D3311 and,
if used in Canada, must be CSA listed. Carefully follow the
manufacturers’ instructions for cutting, cleaning, and solvent
cementing PVC and/or ABS.
