4
18-CD33D1-4
Installer’s Guide
LOCATION AND CLEARANCES
The location of the furnace is normally selected by the ar-
chitect, the builder, or the installer. However, before the
furnace is moved into place, be sure to consider the fol-
lowing requirements:
1. Is the location selected as near the vent and as cen-
tralized for heat distribution as practical?
2. Do all clearances between the furnace and enclosure
equal or exceed the minimums shown in the Table 1.
3. Is there sufficient space for servicing the furnace and
other equipment? A minimum of 24 inches front ac-
cessibility to the furnace must be provided. Any ac-
cess door or panel must permit removal of the largest
component.
4. Are there at least 3 inches of clearance between the
furnace front panel and any closed panel or door
provided?
5. Are the ventilation and combustion air openings large
enough and will they remain unobstructed? If out-
side air is used, are the openings set 12" minimum
above the highest snow accumulation level (18" in
Canadian applications)?
6. Allow sufficient height in supply plenum above or be-
low the furnace to provide for cooling coil installation
if the cooling coil is not installed at the time of this
furnace installation.
7. A furnace shall be installed so electrical components
are protected from water.
8. If the furnace is installed in a
residential garage
, it
must be installed so that the burners and the ignition
source are located not less than 18 inches above the
floor and the furnace must be located or protected to
avoid physical damage from vehicles.
I
MPORTANT:
The furnace must be installed level. The only allowable
variation would be slightly to the left and/or forward in
upflow installations or slightly toward the front in horizontal
installations. This is necessary for proper condensate
drainage.
▲
CAUTION
!
To prevent shortening its service life, the furnace
should not be used as a “Construction Heater” during
the finishing phases of construction until the require-
ments listed in item 9, a-g of the safety section of this
publication have been met. Condensate in the pres-
ence of chlorides and fluorides from paint, varnish,
stains, adhesives, cleaning compounds, and cement
create a corrosive condition which may cause rapid
deterioration of the heat exchanger.
▲
CAUTION
!
Do NOT install the furnace in a corrosive or contami-
nated atmosphere.
▲
WARNING
!
EXPLOSION HAZARD!
PROPANE GAS IS HEAVIER THAN AIR AND MAY
COLLECT IN ANY LOW AREAS OR CONFINED SPAC-
ES. IN ADDITION, ODORANT FADE MAY MAKE THE
GAS UNDETECTABLE EXCEPT WITH A WARNING
DEVICE. IF THE GAS FURNACE IS INSTALLED IN A
BASEMENT, AN EXCAVATED AREA OR A CONFINED
SPACE, IT IS STRONGLY RECOMMENDED TO CON-
TACT A GAS SUPPLIER TO INSTALL A GAS DETECT-
ING WARNING DEVICE IN CASE OF A GAS LEAK
.
NOTE:
The manufacturer of your furnace does NOT test
any detectors and makes no representations regarding
any brand or type of detector.
