Combustion Air - Raypak Versa 105B Brass Installation And Operating Instructions Manual

HIGH WIND CONDITIONS
(OUTDOOR UNITS ONLY)
In areas where high winds are frequent, it may be
necessary to locate the heater a minimum of 3' from high
vertical walls, or install a wind break so the heater is not
in direct wind current.
In areas of daily high winds, it may be necessary to
replace the outdoor stackless top with a stack adapter in
combination with a wind resistant/weather proof outdoor
stack. See illustration below.
The outdoor stack serves the same function as the
low profile stackless top and should be installed in
accordance with the same clearance requirements.
OUTDOOR STACK
STACK ADAPTER
Fig # 9253
INDOOR HEATERS
The design is certified for indoor installation when
equipped with the approved draft hood. Locate heater as
close as practical to a chimney or gas vent. Heater must
always be vented to the outside. See Vent Piping Section
for venting details. Minimum allowable space is shown on
the nameplate.
INDOOR TOP
Fig # 9254

COMBUSTION AIR

Air For combustion And Ventilation
(Indoor Units Only)
The heater must have both combustion and venti-
lation air. Minimum requirements for net free air supply
openings, one 12 inches from ceiling for ventilation and
one 12 inches from the floor for combustion air as outlined
in the latest edition of the National Fuel Gas Code, Z223.1
and any local codes that may have jurisdiction.
CAUTION: Combustion air must not be contaminated
by corrosive chemical fumes which can damage the
heater.
a. All Air From Inside The Building:
Each opening shall have a minimum of 105 net free
square inches.
b. All Air From Outdoors:
When air is supplied directly from outside of
building, each opening shall have a minimum of 27
net free square inches.
11
(INDOOR UNITS ONLY)