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Applying the Table:
If a furnace with 0.60 USGPH nozzle is to be connected to a 20 ft. tall
clay-lined masonry chimney, the thermal resistance of this chimney
type is R2, which is less than R6. The actual firing rate at 156 psig is
1.25 x .60 = .75. Therefore this table shall apply as:
Total input rating of all
connected appliances
kW
kBtu/h
21
70
27
91
31
105
36
119
41
140
51
175
5)
AIR FOR COMBUSTION
WARNING
WARNING
!
Poison carbon monoxide gas hazard.
Comply with ANSI/NFPA (in U.S.) or CSA (in
Canada) standard for the installation of Oil Burning
Equipment and applicable provision of local
building
codes
to
ventilation air.
Failure to provide adequate combustion and
ventilation air can result in personal injury and/or
death.
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 requirement for the
furnace. However, home improvements such as new windows, doors,
and weather stripping have dramatically reduced the volume of air
leakage 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 become less
and less effective and can easily downdraft.
Heat recovery ventilation (HRV) systems are gaining in popularity. The
HRVs are not designed to supply combustion air. If not properly
balanced, a serious negative pressure condition could develop in the
dwelling.
5.2)
Contaminated Combustion Air :
Installation 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 for combustion.
The following areas or types of structures may contain or have
exposure to the substances listed below. The installation must be
6
Flue inside diameter (in)
USGPH
Min.
0.50
3
0.65
3
0.75
4
0.85
4
1.00
4
1.25
4
provide
combustion
The minimum size permitted shall be 4 in. inside diameter.
The maximum size permitted shall be 5 in. inside diameter.
The minimum base temperature shall be about 320ºF.
TABLE # 2
Max.
11
5
300
5
275
5
260
5
250
6
225
6
240
evaluated carefully as it may be necessary to provide outside air for
combustion.
a.
Commercial building.
b.
Building with indoor pools.
c.
Furnaces i nstalled near chemical storage areas.
Exposure to these substances:
a.
Permanent wave solutions for hair.
b.
Chlorinated waxes and cleaners.
c.
Chlorine based swimming pool chemicals.
d.
Water softening chemicals.
e.
De-icing salts or chemicals.
and
f.
Carbon tetrachloride.
g.
Halogen type refrigerants.
h.
Cleaning solvent (such as perchloroethylene).
i.
Printing inks, paint removers, varnishes, etc..
j.
Hydrochloric acid.
k.
Solvent cements and glues.
l.
Antistatic fabric softeners for clothes dryers.
m.
Masonery acid washing materials.
5.3)
Ducted outdoor combustion air:
Outdoor combustion air kit – chimney venting:
The following kit has been certified for use on the appliance. The
component kits contain 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 4" galvanised air duct or
with 4" flexible aluminium air duct. It is recommended that the metallic
air ducting material should be insulated from the air intake up to 5 feet
from the burner to avoid condensation on the outside of the intake
pipe.
CAD-1
Air duct kit consists of 25 feet of insulated UL/ULC Listed
Class 1 air duct, and two 4" steel band clamps. The duct incorporates
a corrugated flexible aluminium core, surrounded by fibreglass
insulation covered with a vinyl vapour barrier.
Minimum base temperature (ºF)
for chimney height (ft) of :
20
400
535
340
430
320
380
300
355
300
365
275
320
28
36
725
535
475
430
430
365
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