Combustion And Ventilation Air - Raypak 503A Installation & Operating Instructions Manual

Fig. 6: Minimum Clearances from Combustible
Surfaces – Indoor and Outdoor Installations
the heater to be serviced in its installed location with-
out movement or removal of the heater.
Service clearances less than the minimum may
require removal of the heater to service either the heat
exchanger or the burner components. In either case,
the heater must be installed in a manner that will
enable the heater to be serviced without removing any
structure around the heater.
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.
The combustion air intake elbow MUST be used for
outdoor installations. It is shipped loose to be installed
at the job site on the air filter intake at rear of the
heater. The elbow MUST be oriented with the opening
facing downward.
Min. Clearance
Heater
from Combustible
Side
Surfaces
Rear
Front
Right Side
Left Side
Top Unobstructed
Vent
Termination
Table D: Clearances – Outdoor Installations

Combustion and Ventilation Air

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.
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.
Combustion
CAUTION:
contaminated by corrosive chemical fumes which
can damage the heater and void the warranty. (See
the Appendix.)
NOTE: It is recommended that the intake vent be
insulated to minimize sweating.
9
Minimum
Service
Clearance
12" 24"
Open 24"
1" 1"
1" 1"
10"
12" 12"
air must not be