035-17473-000-B-1101
10
Unitary Products Group
COMBUSTION CHAMBER
This furnace is equipped with an efficient cerafelt com-
bustion chamber. It is held in place by a retaining
bracket.
The cerafelt combustion chamber is quite soft initially.
After firing, it becomes very brittle. Be sure to do all
alignment and positioning adjustments before the first
firing.
The combustion chamber should be inspected for dam-
age or carbon build-up whenever the oil burner is
removed for repairs or routine maintenance.
BURNER ELECTRODES
Correct positioning of the electrode tips with respect to
each other, to the fuel oil nozzle, and to the rest of the
burners is essential for smooth light ups and proper
operation.
The electrode tips should be adjusted to a gap of 5/32”,
1/16” ahead of the nozzle, 7/16” above the centerline of
the nozzle. The “Z” dimension (front edge of the burner
head to the front face) of the nozzle is 1-1/8 inches.
The electrode porcelains should be free of cracks, the
electrode tips should be tapered and free of burrs, and
the contact rods must be clean and be in firm contact
with the ignition transformer contact springs. The elec-
trodes must not come into contact with the burner
head.
OIL BURNER SET UP
The burner air supply is adjusted to maintain the fuel to
air ratio to obtain ideal combustion conditions. A lack
of air causes "soft" and "sooty" flames, resulting in soot
build-up throughout the heat exchanger passages.
Excess combustion air causes a bright roaring fire and
high stack temperatures resulting in poor fuel effi-
ciency.
PREPARATIONS:
Drill a ¼” test port in the venting, ideally at least 2 diam-
eters (12”) away from the furnace breaching, if venting
horizontally from the furnace, or from the flue pipe
elbow if venting vertically before reaching the furnace.
(see Figures 6 and 7).
Note A: Locate hole at least 6 inches on the furnace
side of the draft control.
Note B: Ideally, hole should be at least 12 inches from
breeching or elbow.
CHECK THE ALIGNMENT OF THE COMBUSTION
CHAMBER AND OIL BURNER BEFORE FIRING. IT IS
POSSIBLE FOR THE COMBUSTION CHAMBER TO
SHIFT IS SUBJECTED TO ROUGH HANDLING DUR-
ING TRANSIT.
Before operating the furnace check burner alignment
with combustion chamber. The end cone of the air
tube must be centered to the accommodating ring pro-
vided in the design of the combustion chamber. Adjust
as necesssary before first firing.
WARNING
CAUTION
FIGURE 5 : TEST PORT LOCATION FOR SMOKE
TEST VERTICAL
FIGURE 6 : TEST PORT LOCATION FOR SMOKE
TEST HORIZONTAL.
