INSTALLATION CONSIDERATIONS
16
tions the connections can be made either through the “top” or
“bottom” of the furnace.
Drain Pan
A drain pan must be provided if the furnace is installed above
a conditioned area. The drain pan must cover the entire area
under the furnace (and air conditioning coil if applicable).
Freeze Protection
If the drain trap and drain line will be exposed to temperatures
near or below freezing, adequate measures must be taken to
prevent condensate from freezing.
NOTE:
The use of insu
-
lation and/or heat tape is recommended. Failure to provide
proper condensate drainage can result in property damage.
Propane Gas and/or High Altitude Installations
WARNING
P
OSSIBLE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH MAY OCCUR IF
THE CORRECT CONVERSION KITS ARE NOT INSTALLED.
T
HE APPROPRIATE KITS
MUST BE APPLIED TO INSURE SAFE AND PROPER FURNACE OPERATION.
A
LL
CONVERSIONS MUST BE PERFORMED BY A QUALIFIED INSTALLER OR SERVICE
AGENCY.
This furnace is shipped from the factory configured for natural
gas at standard altitude. Propane gas installations require an
orifice change to compensate for the energy content difference
between natural and propane gas.
High altitude installations may require both a pressure switch
and an orifice change. These changes are necessary to com
-
pensate for the natural reduction in the density of both the gas
fuel and the combustion air at higher altitude.
Refer to the
Accessories Charts
in this manual or product
Specification Sheet for a tabular listing of appropriate manu
-
facturer’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 AND COMBUSTION AIR PIPE
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
U
PON COMPLETION OF THE FURNACE INSTALLATION, CAREFULLY INSPECT THE
ENTIRE FLUE SYSTEM BOTH INSIDE AND OUTSIDE 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.
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 com
-
bustion 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 material.
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.
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.
D
ual Certification: Non-Direct/Direct Vent (90%
Furnaces Only)
The 90% furnace is dual certified and may be installed as a
non-direct vent (single pipe) or direct vent (dual pipe) appli
-
ance. A
non-direct vent
installation requires only a vent/flue
pipe. 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.
WARNING
T
O 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.
A
VOID BREATHING
CEMENT VAPORS OR CONTACT WITH SKIN AND/OR EYES.
Precautions should be taken to prevent condensate
from freezing inside the vent/flue pipe and/or at the vent/
flue pipe termination. It is our recommendation that all
vent/flue piping exposed to temperatures below 35°F for
extended periods of time should be insulated with 1/2”
thick closed cell foam. Also all vent/flue piping exposed
outdoors in excess of the terminations shown in this
manual (or in unheated areas) should be insulated with
1/2” thick closed cell foam. Inspect piping for leaks prior
to installing insulation.