4
The flue pipe should be as short as
possible with horizontal pipes sloping
upward toward the chimney at a rate of
one-quarter inch to the foot. The flue
pipe should not be smaller in cross
sectional area than the flue collar on the
furnace. The flue pipe may be reduced in
size to fit a smaller diameter chimney
with the use of a tapered reducer fitting
at the chimney inlet. The flue pipe should
connect to the chimney such that the flue
pipe extends into, and terminates flush
with the inside surface of the chimney
liner. Seal the joint between the pipe and
the lining. The chimney outlet should be
at least two feet above the highest point
of a peaked roof. All unused chimney
openings should be closed. Chimneys
must conform to local, provincial or state
codes, or in the absence of local
regulations, to the requirements of the
National Building Code.
See Figure 2 and Table 2 for common
chimney problems and their remedies.
THE FURNACE MUST BE
CONNECTED TO A FLUE HAVING
SUFFICIENT DRAFT AT ALL TIMES TO
ENSURE SAFE AND PROPER
OPERATION OF THE APPLIANCE.
The flue pipe must not be routed through
concealed space, because it must be
visually checked for signs of
deterioration during the annual
inspection and servicing. The flue pipe
must not pass through any floor or
ceiling, but may pass through a wall
where suitable fire protection provisions
have been installed. In the United States,
refer to the latest edition of NFPA 31 for
regulations governing the installation of
oil burning equipment. In Canada, refer
to the latest edition of CAN/CSA B139
for rules governing the installation of oil
burning equipment.
DRAFT REGULATOR CONTROL
This device is used in conjunction with
conventional chimney venting. This
control (or draft regulator) automatically
maintains a constant negative pressure
in the furnace to obtain maximum
efficiency. It ensures that proper
pressures are not exceeded. If the
chimney does not develop sufficient
draft, the draft control cannot function
properly. The draft regulator, must be
installed within the same room or
enclosure as the furnace, and should not
interfere with the combustion air supplied
to the burner. The control should be
located a minimum of 3 flue pipe
diameters from the furnace breeching
and installed in accordance to the
instructions supplied with the regulator.
