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Connection of combustion air piping to the terminal
DV-2000™
Refer to Part 1, section 5.3 (1.5.3), Outdoor Combustion Air –
Side-wall Venting, DV-2000™ for a complete description.
1.5
AIR FOR COMBUSTION
WARNING
Poisonous carbon monoxide gas hazard.
Comply with NFPA or CSA standards for the
installation of Oil Burning Equipment and
applicable provisions of local building codes to
provide combustion and ventilation air.
Failure to provide adequate combustion and
ventilation air can result in death or personal
injury.
1.5.1
General
Oil furnaces must have an adequate supply of combustion air. It
is common practice to assume that older homes have sufficient
infiltration to accommodate the combustion air requirements for
the furnace. However, home improvements such as new
windows, doors, and weather stripping have drastically reduced
the volume of air infiltration into the home.
Home air exhausters are common. Bathroom and kitchen fans,
power vented clothes dryers and water heaters all tend to create
a negative pressure in the home. Should this occur the chimney
becomes less and less effective and can easily downdraft.
Heat Recovery Ventilation Systems (HRVS) are gaining in
popularity. HRVS are not designed to supply combustion air. If
not properly balanced, a serious negative pressure condition
could develop in the dwelling.
1.5.2
Contaminated Combustion Air
Installations in certain areas or types of structures will increase
the exposure to chemicals or halogens which may harm the
furnace. These instances will require that only outside air be
used for combustion.
The following areas or types of structures may contain or be
exposed to certain substances, potentially requiring outside air
for combustion:
a.
Commercial buildings;
b.
Buildings with indoor pools;
c.
Furnaces installed near chemical storage areas.
Exposure to the following substances:
a.
Permanent wave chemicals for hair;
b.
Chlorinated waxes and cleaners;
c.
Chlorine based swimming pool chemicals;
d.
Water softening chemicals;
e.
De-icing salts or chemicals;
f.
Carbon tetrachloride;
g.
Halogen type refrigerants;
h.
Cleaning solvent (such as perchloroethylene);
i.
Printing inks, paint removers, varnishes, etc. ;
j.
Hydrochloric acid;
12
k.
Solvent based glue;
l.
Antistatic fabric softeners for clothes dryers;
m.
Acid based masonry cleaning materials.
1.5.3
Ducted outdoor combustion air
Three burners are set up to duct outside combustion air directly to the
burner; the Beckett AFII and Riello 40-BF for side-wall venting and the
Beckett AFG for use with conventional chimney venting. The Riello 40-F is
not suitable for direct-connected outdoor air.
CAUTION
The use of ducted outside combustion air is mandatory for
the DV-2000™ venting system. This system operates on a
balanced flue principle and will not function properly if the
combustion air piping is not attached and sealed at all
connections between the vent terminal and burner inlet.
Outdoor combustion air kit – chimney venting
The following kit has been certified for use on this appliance. The kit
contains an important safety feature, namely a vacuum relief valve, or VRV.
During normal operation the burner aspirates outdoor air. If the intake
terminal ever becomes partially blocked or fully blocked from ice or snow
etc., the VRV will open to allow a proportion of air from the dwelling to enter
the burner thus maintaining proper combustion. Once the blockage is
removed, the VRV will close and the burner will draw all air from the
outdoors again.
CAS-2B Components (except air duct) for the Beckett AFG burner: The kit
includes the intake terminal, vacuum relief valve (VRV) and special air boot
connection with integral air adjustment means for the AFG burner. The
CAS-2B can be used with a 0.10 m (4") galvanized steel air duct or with a
0.10 m (4") flexible aluminium air duct. It is recommended that the metallic
air ducting material be insulated from the air intake up to 1.5 m (5') from the
burner, to avoid condensation on the outside of the intake pipe.
CAD-1
This air duct kit consists of 7.6 m (25') of insulated UL/ULC Listed
Class 1 air duct and two 0.10 m (4") steel band clamps. The duct
incorporates a corrugated flexible aluminium core, surrounded by fibreglass
insulation and a vinyl vapour barrier.
CAUTION
The CAS-2B does not turn the furnace installation into a
direct vent system. Therefore, the building structure must
provide for adequate combustion air to be delivered to the
Vacuum Relief Valve. The burner will need to draw
combustion air from the VRV's surroundings if the intake
ever
becomes
blocked.
installation codes must be followed.
Comprehensive installation instructions are provided with the kit.
Outdoor combustion air – side-wall venting, DV-2000™
The DV-2000™ venting system is a sealed system and completely isolates
the furnace from the interior of the building. The burner is totally unaffected
by any pressure fluctuations within the building which makes it ideal for tight
home construction.
Therefore,
non-direct
vent
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