10
CLEARANCE –
ACCESSIBILITY
The design of forced air furnaces with
input ratings as listed in the tables on
the following pages are certified by
CSA for the clearances to combustible
materials shown in inches.
See name/rating plate and clearance
label for specific model number and
clearance information.
Service clearance of at least 24 inches
is recommended in front of all furnaces.
ACCESSIBILITY CLEARANCES,
WHERE GREATER, MUST TAKE
PRECEDENCE OVER FIRE PROTEC-
TION CLEARANCES.
UPFLOW AND HORIZONTAL
FURNACES MUST NOT BE
INSTALLED DIRECTLY ON CARPET-
ING, TILE OR OTHER COMBUSTIBLE
MATERIAL OTHER THAN WOOD
FLOORING. INSTALLATION ON A
COMBUSTIBLE MATERIAL CAN
RESULT IN FIRE CAUSING PROPER-
TY DAMAGE, SEVERE PERSONAL
INJURY OR DEATH.
A gas-fired furnace for installation in a
residential garage must be installed so
that the burner(s) and the ignition
source are located not less than 18”
above the floor and the furnace is locat-
ed or protected to avoid physical dam-
age by vehicles.
DOWNFLOW UNIT DESIGN IS CERTI-
FIED FOR INSTALLATION ON NON-
COMBUSTIBLE FLOOR. A SPECIAL
COMBUSTIBLE FLOOR SUB-BASE,
FIGURE 5, IS REQUIRED WHEN
INSTALLING ON A COMBUSTIBLE
FLOOR. FAILURE TO INSTALL THE
SUB-BASE MAY RESULT IN FIRE,
PROPERTY DAMAGE, PERSONAL
INJURY OR DEATH.THIS SPECIAL
BASE IS OFFERED AS AN ACCES-
SORY FROM THE FACTORY. SEE THE
CLEARANCE LABEL LOCATED
INSIDE THE FURNACE FOR THE
APPROPRIATE MODEL NUMBER.
THE SPECIAL BASE IS NOT
REQUIRED WHEN THE FURNACE IS
INSTALLED ON TOP OF AN AIR
CONDITIONING PLENUM.
DUCTING
Proper air flow is required for the
correct operation of this furnace. Too
little air flow can cause erratic oper-
ation and can damage the heat
exchanger. The duct system must
carry the correct amount of air for
heating and cooling. Position the
unit to minimize long runs or runs
with many turns and elbows.
Size and install the ducts according
to acceptable industry standards
and methods. The total static pres-
sure drop (including evaporator coil,
if used) of the entire system should
not exceed 0.8” w.c.
Be sure to have
adequate space for unit filter. NOTE:
Airflow external static pressure mea-
surements do not include filter or
coil.
IMPORTANT: Some high efficiency
filters have a greater than normal
resistance to air flow. This can
adversely affect furnace operation.
BE SURE TO CHECK AIR FLOW if
using any filter other than the facto-
ry-provided filter.
NOTE: DO NOT take return air from
bathrooms, kitchens, furnace rooms,
garages, utility or laundry rooms, or
cold areas.
IMPORTANT: Return air tempera-
ture must be above 55°F during the
heating season.
NEVER ALLOW PRODUCTS OF
COMBUSTION OR THE FLUE
PRODUCTS TO ENTER THE
RETURN AIR DUCTWORK, OR
THE CIRCULATING AIR SUPPLY.
ALL RETURN DUCTWORK MUST
BE ADEQUATELY SEALED AND
SECURED TO THE FURNACE
WITH SHEET METAL SCREWS,
AND JOINTS TAPED. WHEN A
FURNACE IS MOUNTED ON A
PLATFORM, WITH RETURN
THROUGH THE BOTTOM, IT MUST
BE SEALED AIRTIGHT BETWEEN
THE FURNACE AND THE RETURN
AIR PLENUM. THE RETURN AIR
PLENUM MUST BE PERMANENT-
LY ENCLOSED. NEVER USE A
DOOR AS A PART OF THE
RETURN AIR PLENUM.THE
FLOOR OR PLATFORM MUST
PROVIDE SOUND PHYSICAL
SUPPORT OF THE FURNACE,
WITHOUT SAGGING, CRACKS,
GAPS, ETC., AROUND THE BASE
AS TO PROVIDE A SEAL
BETWEEN THE SUPPORT AND
THE BASE.
SITE SELECTION
1. Select a site in the building near the
center of the proposed, or existing,
duct system.
2. Give consideration to the vent sys-
tem piping when selecting the fur-
nace location. Be sure the venting
system can travel from the furnace to
the termination with minimal length
and elbows.
3. Locate the furnace near the existing
gas piping. Or, if running a new gas
line, locate the furnace to minimize
the length and elbows in the gas pip-
ing.
4. Locate the furnace to maintain prop-
er clearance to combustibles as
shown in Figures 3 and 4.
WHEN COILS ARE INSTALLED
ABOVE A FINISHED CEILING OR
LIVING AREA, IT IS RECOMMENDED
THAT AN AUXILIARY SHEET METAL
CONDENSATE DRAIN PAN BE FAB-
RICATED AND INSTALLED UNDER
ENTIRE UNIT. FAILURE TO DO SO
CAN RESULT IN PROPERTY DAM-
AGE. RUN CONDENSATE TO A
LOCATION WHERE IT IS NOTICE-
ABLE.
COMBUSTIBLE MATERIAL MUST
NOT BE PLACED ON OR AGAINST
THE FURNACE JACKET OR WITHIN
THE SPECIFIED CLEARANCES OF
THE VENT PIPE. THE AREA AROUND
THE FURNACE MUST BE KEPT
CLEAR AND FREE OF ALL COM-
BUSTIBLE MATERIALS INCLUDING
GASOLINE AND OTHER FLAMMA-
BLE VAPORS AND LIQUIDS.
PLACEMENT OF COMBUSTIBLE
MATERIALS ON, AGAINST OR
AROUND THE FURNACE JACKET
CAN CAUSE AN EXPLOSION OR
FIRE RESULTING IN PROPERTY
DAMAGE, PERSONAL INJURY OR
DEATH. THE FURNACE OWNER
SHOULD BE CAUTIONED THAT THE
FURNACE AREA MUST NOT BE
USED AS A BROOM CLOSET OR
FOR ANY OTHER STORAGE PUR-
POSES.
CAUTION
!
WARNING
!
WARNING
!
WARNING
!
WARNING
!
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