SYSTEM OPERATION
11
For furnaces being converted to LP gas, it is strongly
recommended 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
installations. 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 combustion
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
Centrotherm 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 manufacturers’
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-direct
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 specifications
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
materials must be UL S636 listed.
NOTE: Requirement does not apply to the combustion air
pipe.
