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TR Series
Any oil-fired boiler must have a steady draft* and an ample supply of
combustion air at all times during firing. If air supply or chimney
draft* is unreliable, CO
and overfire draft* will change unpredictably.
2
DO NOT vent this boiler to the same chimney flue used by a
fireplace or coal or wood burning furnace or boiler. The draft*
produced by solid fueled devices varies tremendously between
high fire and low fire:
In modern, weather stripped, energy-saving buildings or older
buildings which have been modified similarly, natural infiltration
may not supply enough air for combustion, particularly if other fuel
burning appliances, exhaust fans or draft inducers are competing for
the same air supply. Fireplaces, other solid fuel burning appliances
and exhaust fans consume great quantities of air; if air supply is not
* Draft is negative or suction pressure
TABLE 2: Provisions for Combustion and Ventilation Air Supply. See CSA B139, latest edition, section 7, for more detailed
information.
Boiler Location
2.1
Unconfined space
2.2
Unconfined space
2.3
Confined space
2.4
Confined space
(1) Test for sufficient air for combustion by infiltration by running this boiler for 30 minutes under all of the following conditions and at the same time: a) all doors,
windows and other like openings must be closed, b) all fuel burning appliances should be FIRING, c) all exhaust fans and clothes dryers turned ON. At the
above conditions the CO
, smoke and draft readings must be normal. (CO
2
(.02") W.C. and 1.0 mm (.04") W.C. negative pressure.)
(2) Aside from tight construction, some of the conditions that steal air for combustion from a boiler are other fuel burning appliances, exhaust fans and clothes dry-
ers.
(3) Generally, louvers made of wood have a free open area of 20% and those made of metal have a 60% to 70% free open area. Screens also reduce the open area
of the louvers.
Air Supply
Is there sufficient air for combus-
tion by natural infiltration (see
NOTE (1), "Test..." below)?
If there in NOT sufficient air for
combustion by natural infiltration
due to tight construction or other
conditions, then it REQUIRES AIR
FROM OUTDOORS. SEE "ACTION
REQUIRED" column at right. See
Notes (1) and (2) below.
If there is sufficient air for combus-
tion from within building but it
comes from outside of the
confined space, see "ACTION
REQUIRED" column at right.
See Note (1) below.
If there is NOT sufficient air for
combustion due to tight construc-
tion or other conditions it
REQUIRES AIR FROM OUT-
DOORS. SEE "ACTION
REQUIRED" column at right.
See NOTE (2) below.
ample, such an appliance will create a downdraft in the oil-fired boiler
flue. This can create a hazardous condition. Flue gases can be
sucked out of the chimney through the vent regulator into the living
space. DO NOT operate this boiler and a solid fuel burning appliance
at the same time, unless the solid fuel burner is provided with its own
outside air supply.
See Table 2, "Provisions for Combustion and Ventilation Air Supply"
for determining need and method of providing air for combustion and
ventilation.
If fly screen must be used over air supply openings, areas calculated
should be doubled; the screen should be inspected and cleaned fre-
quently to maintain free air flow.
Protect air openings against closure by snow, debris, etc. Openings
such as doors or windows, if used, must be locked open.
Action Required
NONE
Provide air from outdoors directly through a permanent out-
side wall opening or openings with a free open area of not
less than 645 mm
/1172W (1 sq. in. per 4000 Btu/hr) of
2
TOTAL input of ALL fuel burning appliances in the building.
See Note (1) and (3).
The confined space shall be provided with two permanent air
openings, one near the top of the enclosure and one near the
bottom. EACH opening shall have a free air opening of not
less than 645 mm
/293 W (1 sq. in. per 1000 Btu/hr.) of
2
TOTAL input of ALL fuel burning appliances within the enclo-
sure. The two openings shall freely communicate with the
interior areas of the building which in turn would have to have
adequate infiltration of air from outdoors. See Notes (1, 3)
and Figure 3a.
(a) Air from the outdoors shall be provided to the confined
space by two permanent openings, one in or near the top
of the enclosure space and one in or near the bottom.
The openings shall communicate directly, or by means of
ducts, with outdoors or to such spaces (crawl or attic) that
freely communicate with outdoors (See figures 3b, 3c
and 3d).
(b) Where directly communicating with outdoors or by means
of vertical ducts, each opening shall have a free area of
not less than 645 mm
or 5964 mm
/litre/hr (35 sq. in. per gal. per hr.) of total
2
input rating of all appliances in the enclosure. If horizontal
ducts are used, each opening shall have a free area of not
less than 645 mm
2
11928 mm
/Litre/hr ((70 sq. in. per gal. per hr.) of total
2
input of all appliances in the confined space. See Figures
3b, 3c and 3d.
between 11% and 13%, smoke between ZERO and a TRACE, draft between 0.5 mm
2
/1172 W (1 sq. in. per 4,000 Btu/hr.)
2
/586 W (1 sq. in. per 2,000 Btu/hr.) or
5
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