11
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 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.
Installation of this furnace at altitudes above
7000 ft (2134m) shall be made in accordance
with the Listed High Altitude Conversion Kit
available with this furnace.
L’installation de ce générateur de chaleur à
des altitudes supérieures à 7000 pi (2134m) doit
être effectuée conformément aux instructions
accompagnant la trousse de conversion pour
haute altitude fournie avec cet appareil.
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.
HIGH STAGE LOW STAGE
#45 (1)
#50 (2)
LPM-08* (1) 1.25MM (1)
LPM-30* (2)
#57 (2)
*supports both Honeywell and White-Rodgers 2-stage valves
(1) FOR USE WITH ALL MODELS EXCEPT *MEC960303AN and *MEC960302BN
(2) FOR USE WITH ONLY *MEC960302BN MODEL
NATURAL
0 - 7000
NONE
3.5" w.c.
1.9" w.c.
NONE
PROPANE
10.0" w.c.
6.0" w.c.
NONE
GAS
ALTITUDE
KIT
ORIFICE
MANIFOLD PRESSURE
PRESSURE SWITCH
CHANGE
Vent Pipe & Combustion Air
WARNING
Failure to follow these instructions can result in bodily
injury or death. Carefully read and follow all instructions
given in this section.
WARNING
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 monoxide.
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.
This furnace is dual certified and may be installed as a
non-direct vent (single pipe) or direct vent (dual pipe)
appliance.
M
aterials - Installations in the U.S.
A
PVC, CPVC, or ABS pipe & fittings are typically used as
venting and intake pipe materials. All 90° elbows must
be medium or long radius types. A medium radius elbow
should measure ~3-1/16” minimum from the plane of
one opening to the center line of the other opening for 2”
diameter pipe, and ~4-9/16” minimum for 3” pipe.
In addition to these materials, 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. 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. Refer to the following chart for plastic pipe &
fittings specifications
M
aterials - Installations in Canada
All installations in Canada must conform to the
requirements of CAN/CSA B149.1-15 code. All vent
components, including primer and cement, must be listed
to ULC S636. The certified pipe and fittings should be
clearly marked with the ULC standard “S636”. The primer
and cement used must be of the same manufacturer as
the vent system. For Royal Pipe System 636; use GVS-
65 Primer (Purple) and GVS-65 PVC Solvent Cement.
For IPEX System 636, use PVC/CPVC Primer, Purple
or clear. Use PVC Solvent cement (Gray). For Canadian
installations, ABS may be used as a combustion air pipe
only. ABS is not an approved vent material in Canada.
If ABS is used as a combustion air pipe, it must be CSA
certified. Always follow the manufacturer’s instructions
in the use of primer and cement. Do not use primer and
cement around potential sources of ignition. Do not use
primer or cement beyond its expiration date.
Materials and Joining Methods
WARNING
To avoid bodily injury, fire or explosion, solvent cements
must be kept away from all ignition sources (i.e., sparks,
open flames, and excessive heat) as they are combustible
liquids. Avoid breathing cement vapors or contact with skin
and/or eyes.
