Installer’s Guide
5
AIR FOR COMBUSTION AND VENTILATION
VENTILATION REQUIRED!
Relief openings in the front or top of the furnace casing
should not be obstructed or blocked. These openings
supply combustion and ventilation air to the furnace.
Chloride, fluoride, iodide, and bromide bearing com-
pounds when present, even in low concentrations, in
air supplied for combustion to the furnace, can result
in accelerated and severe corrosion of the heat ex
-
changer and/or the venting system. This condition can
occur with less efficient furnaces, but is more likely to
happen on furnaces with efficiencies of 80% or greater.
1) When the furnace is installed in the horizon-
tal configuration, the oil burner must be mount-
ed in an upright position. It will be necessary to re-
move the burner then cutoff one (1) of the threaded
burner-mounting studs before attempting to repo
-
sition the burner in the upright position. See Fig-
ure 3. Trial fit the burner to the burner mounting
plate to determine which stud to remove. (A rota
-
ry tool with a cutting (abrasive) disk or a hacksaw
should work well to remove the stud.)
A machine bolt (furnished with the parts package)
will substitute for the removed stud and provide
a third point to secure the burner flange to the
burner mounting plate. Thread the bolt through
the burner-mounting flange and into the open hole
within the burner mounting plate. See Figure 3.
2) Install the flange gasket and the burner on the
mounting plate threaded studs. Using fasteners
supplied in the parts bag with each furnace [use
two (2) or three (3) 5/16 in. brass hex nuts and flat
washers, as required], secure the burner to the
mounting studs on the burner mounting plate.
3) Secure the electrical conduit of the wiring harness
to the oil burner junction box with the hardware
provided.
POSSIBLE OVERHEATING!
When converting to horizontal, the high limit and fan
control may have to be moved.
Failure to do so may result in an overheating condition
leading to property damage, or loss of life.
4) When the furnace is installed in the horizon-
tal configuration, the high limit and fan control
must also be located in the upper position on the
casing when the furnace is placed in the final in
-
stalled position, refer to Figure 4.
If the control must be relocated, remove the cov
-
er of the control to gain access to the mounting
screws. Remove the mounting screws and the con
-
trol. Insert the control into the alternate mounting
hole in the casing and mark the screw locations.
Drill pilot holes for the new screws. Install the
control in the new mounting location and secure it
with the mounting screws. Replace the cover of the
control. A metal, snap-in cap is furnished with the
furnace to close the unused hole, for the control, in
the cabinet.
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