9
Fig. 6: Minimum Clearances from Combustible
Surfaces – Indoor and Outdoor Installations
The combustion air intake elbow
MUST
be used for
outdoor installations. It is shipped loose to be installed
on the air filter intake at the rear of the heater at the job
site. The elbow
MUST
be oriented with the opening
facing downward (shipped loose).
Table D: Clearances – Outdoor Installations
Outdoor Installations
These heaters are design-certified for outdoor installa-
tion. Heaters must not be installed under an overhang
unless clearances are in accordance with local instal-
lation codes and the requirements of the gas supplier.
Three sides must be open in the area under the over-
hang. Roof water drainage must be diverted away
from heaters installed under overhangs.
Combustion and Ventilation Air
Indoor Units
This heater must be supplied with sufficient quantities
of non-contaminated air to support proper combustion
and equipment ventilation. Combustion air can be sup-
plied via conventional means where combustion air is
drawn from the area immediately surrounding the
heater, or via direct vent, where combustion air is
drawn directly from outside. All installations must com-
ply with the requirements of the NFGC (U.S.) and
B149 (Canada), and all local codes.
NOTE:
Use of this heater in construction areas
where fine particulate matter, such as concrete or
dry-wall dust, is present may result in damage to the
heater that is not covered by the warranty. If
operated in a construction environment, a clean
source of combustion air must be provided directly to
the heater.
Heater
Side
Min. Clearance
from Combustible
Surfaces
Minimum
Service
Clearance
Rear
12”
36”
Right Side
1”
24”
Left Side
1”
1”
Top
Unobstructed
10”
Vent
Termination
12”
12”
CAUTION:
Combustion air must not be
contaminated by corrosive chemical fumes which
can cause non-warrantied damage to the heater.
(See the Appendix.)
NOTE:
It is recommended that the intake vent be
insulated to minimize sweating when inistalled in
cold climates.
