Desa VF-24N-BTB - Manual (Page 8)

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AIR FOR COMBUSTION
AND VENTILATION
Continued
Figure 3 - Ventilation Air from Outdoors
Outlet
Air
Ventilated
Attic
Outlet
Air
Inlet
Air
Inlet Air
Ventilated
Crawl Space
To
Crawl
Space
To Attic
INSTALLATION
NOTICE: This heater is intended
for use as supplemental heat.
Use this heater along with your
primary heating system. Do not
install this heater as your pri-
mary heat source. If you have a
central heating system, you may
run system’s circulating blower
while using heater. This will help
circulate the heat throughout the
house. In the event of a power
outage, you can use this heater
as your primary heat source.
WARNING: A qualified ser-
vice person must install heater.
Follow all local codes.
NOTICE: State or local codes
may only allow operation of this
appliance in a vented configura-
tion. Check your state or local
codes.
WARNING: Make sure the
selector switch is in the OFF po-
sition before installing heater.
WARNING: Before installing in
a solid fuel burning fireplace, the
chimney flue and firebox must be
cleaned of soot, creosote, ashes
and loose paint by a qualified chim-
ney cleaner. Creosote will ignite
if highly heated. A dirty chimney
flue may create and distribute soot
within the house. Inspect chimney
and firebox flue for damage. If
damaged, repair flue and firebox
before operating heater.
WARNING: Seal any fresh
air vents or ash clean-out doors
located on floor or wall of fire-
place. If not, drafting may cause
pilot outage or sooting. Use a
heat-resistant sealant. Do not
seal chimney flue damper.
WARNING: Never install the
heater
• in a bedroom or bathroom un-
less installed as a vented unit,
see page 11
• in a recreational vehicle
• where curtains, furniture, cloth-
ing or other flammable objects
are less than 42" from the front,
top or sides of the heater
• in high traffic areas
• in windy or drafty areas
ventilation Air From Outdoors
Provide extra fresh air by using ventilation grills or
ducts. You must provide two permanent openings:
one within 12" of the ceiling and one within 12"
of the floor. Connect these items directly to the
outdoors or spaces open to the outdoors. These
spaces include attics and crawl spaces. Follow the
National Fuel Gas Code, ANSI Z223.1/NFPA 54,
Section 5.3, Air for Combustion and Ventilation for
required size of ventilation grills or ducts.
IMPORTANT:
Do not provide openings for inlet
or outlet air into attic if attic has a thermostat-
controlled power vent. Heated air entering the attic
will activate the power vent.