For installations above 7,000 ft (2,133.6 m), refer to your
distributor for required kit(s).
LPM-05* supports White-Rodgers 2-stage valve only.
LPM-06* supports both Honeywell and White-Rodgers 2-stage
In Canada, gas furnaces are only certified to 4,500 ft
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 proper
furnace operation. All conversions must be performed by a
qualified installer or service agency.
VENT/FLUE PIPE AND
COMBUSTION AIR PIPE
Failure to follow these instructions can result in bodily
injury or death. Carefully read and follow all instructions
given in this section.
Upon completion of the furnace installation, carefully
inspect the entire flue system both inside and outside of
the furnace to assure it is properly sealed. Leaks in the
flue system can result in serious personal injury or death
due to exposure to flue products, including carbon
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 pipe is used as venting
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.
Do not 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 avoid flue pipe separation, shifting or sagging during
Dual Certification: Nondirect/Direct Vent
This furnace is dual certified and may be installed as a nondirect
vent (single pipe) or direct vent (dual pipe) appliance. A nondirect
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
To avoid bodily injury, fire or explosion, solvent cements
must be kept away from all ignition sources (for example,
sparks, open flames and excessive heat) as they are
combustible liquids. Avoid breathing cement vapors or
contact with skin and/or eyes.
2" or 3" (5.1 cm or 7.6 cm) 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 pipe
manufacturer's instructions for cutting, cleaning and solvent
cementing of PVC.
The use of Schedule 40 PVC 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.
As an alternative to PVC pipe, primer, solvent cement and fittings,
ABS materials which are in compliance with the following
specifications may be used. 2" or 3" (5.1 cm or 7.6 cm) ABS
Schedule 40 pipe must meet ASTM D1527 and, if used in
Canada, must be CSA approved. Solvent cement for ABS to ABS
joints must meet ASTM D2235 and, if used in Canada, must be
CSA approved. 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 approved. Carefully follow the manufacturers'
instructions for cutting, cleaning, and solvent cementing PVC
All 90° elbows must be medium radius (¹⁄₄ bend DWV) or long
radius (long sweep ¹⁄₄ bend DWV) types conforming to ASTM
D3311. A medium radius (¹⁄₄ bend DWV) elbow measures 3¹⁄₁₆"
(7.8 cm) minimum from the plane of one opening to the centerline
of the other opening for 2" (5.1 cm) diameter pipe, and 4⁹⁄₁₆"
(11.6 cm) minimum for 3" (7.6 cm) pipe.