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Fig. 13: Recommended Smokepipe Arrangement
and Chimney Requirements
requires less fuel to be burned and sends less heat
up the chimney.
A new boiler probably has a higher efficiency than
the boiler being replaced. That probably means that
the stack temperature from the new boiler will be
lower than that from the old boiler and with less
room air being drawn up the chimney to dilute the
stack gases. The combination of a large uninsulated
chimney, reduced firing rate, reduced firing time,
lower stack temperature and less dilution air can, in
some cases, contribute to the condensing of small
amounts of water vapor in the chimney. Such
condensation, when it occurs, can cause chimney
deterioration. In extreme cases, condensed water
may be visible on the outside of the breeching or
chimney. In those extreme cases, the chimney may
have to be lined to insulate the chimney and thus
prevent the condensation. The addition of dilution
air into the chimney may assist in drying the
chimney interior surfaces.
A massive chimney on a cold, or exposed outside
wall may have produced adequate draft when it was
fired with a higher input and greater volumes of
heated gases. With reduced input and volume, the
draft may be severely affected. In one instance our
research showed a new chimney of adequate sizing
produced only -.035" W.C. after 30 minutes of
continuous firing at 13.0% CO
chimneys take longer to heat up and can have .00"
W.C. draft at burner startup. You may have to
consider a special alloy chimney flue liner with
insulation around it and a stabilizing draft cap or
even a draft inducing fan in severe cases.
. Outside wall
2
16
Fig. 14: Proper and Improper Locations
of Draft Regulator
3. For the same reasons as in (2.) above, heat
extractors mounted into the breeching are not
recommended.
H. INSTALL ELECTRIC WIRING in accordance with
National Electrical Code and local regulations. A
separate ELECTRICAL CIRCUIT should be run from
meter with a Fused Disconnect Switch in the Circuit.
Wiring should conform to Figures 17 thru 23.
CANADA- Refer to CSA standard C22.2 Part 1, 1990,
Electrical Features of Fuel Burning Equipment (Gas
and Oil).
I.
FUEL UNITS AND OIL LINES
SINGLE-PIPE OIL LINES - Standard burners are
provided with single-stage 3450 rpm fuel units with
the by-pass plug removed for single-pipe installations.
The single-stage fuel unit may be installed single-pipe
with gravity feed or lift. Maximum allowable lift is 8
feet. See Figure 15.
TWO-PIPE OIL LINES - For two-pipe systems where
more lift is required, the two-stage fuel unit is
recommended. Table 4 (single-stage) and Table 5
(two-stage) show allowable lift and lengths of 3/8-inch
and 1/2-inch OD tubing for both suction and return
lines. Refer to Figure 16.
Be sure that all oil line connections are absolutely
airtight. Check all connections and joints. Flared
fittings are recommended. Do not use compression
fittings or PTFE ("Teflon®") tape.
Open the air-bleed valve and start the burner. For
clean bleed, slip a 3/16" ID hose over the end of the
bleed valve and bleed into a container. Continue to
bleed for 15 seconds after oil is free of air bubbles.
Stop burner and close valve.
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