4-14. Fuel Strainer
a. Removal.
(1) Heater must be shut off and cool. Depress valve trip lever (fig. 2-4 (2) to shut off fuel flow.
(2) Place a receptacle below fuel control valve. Loosen two screws holding siphon drain (27, fig. 4-2) to top of
frame (29). Disconnect line (26) from bottom of the siphon drain. Remove screws (18), gasket (20) and cap (17). Allow
surplus oil to drain into receptacle.
b. Cleaning and Inspection.
(1) Brush strainer inside and out with a soft brush. Rinse in clean fuel oil.
(2) Wipe strainer chamber with a lint free cloth. Inspect for any damage. Replace if necessary.
c. Installation. Install strainer, strainer cap and gasket in reverse order of removal. Check for leaks.
4-15. Fuel Strainer (Used on Models 441-4ABJ and 444-4A).
a. Removal.
(1) Heater must be off and cool. Raise reset lever (fig. 2-4) to shut off fuel flow.
(2) Place a receptacle below fuel control valve and remove strainer screws(18, fig. 4-2), gasket (20), and
strainer cap (17). Allow surplus oil to drain into receptacle. Remove strainer (19).
b. Cleaning and Inspection.
(1) Brush strainer inside and out with a small stiff brush, such as a tooth brush, or place in boiling wafer for ten
minutes. Rinse in clean fuel oil.
4-16. Siphon System
a. General.
The siphon system consists of
the siphon assembly (fig. 4-1) and the siphon drain tube (27, fig. 4-2).
The siphon assembly fits into the siphon drain tube when heater is ready for operation.
b. Removal.
(1) Lift and remove siphon assembly from siphon drain tube.
(2) Remove two bolts holding the siphon drain tube to the frame (29) and remove tube. Flush tube with clean
fuel oil and be sure the outlet connection is clean.
(3) Remove bottom (2, fig. 4-1) from siphon barrel (1). Remove screen (3) spring (4) and plunger (5). Clean
siphon by flushing with clean fuel oil. Clean inside of barrel and plunger in clean oil.
CAUTION
Do not kink siphon or siphon tube.
4-17. Fuel Lines
a. Removal and Installation. Remove fuel lines from fuel system as necessary for cleaning, inspection or
replacement. Refer to figure 4-2 for fuel lines and major components.
b. Cleaning and Inspection.
(1) Clean lines and fittings in an approved solvent and dry thoroughly.
(2) Inspect all meter parts for damaged threads obstructions kinks or bend cracks or other damage. Replace if
damaged.
Section VII. MAINTENANCE OF THE BURNER ASSEMBLY
4-18. General
The burner should be cleaned quarterly or as often as necessary. A natural accumulation of carbon on the bottom and
sides need not be removed unless oil inlet becomes clogged.
4-19. Burner Cleaning
To clean burner proceed as follows:
a. Shut off heater and allow it to cool.
b. Open burner door, bend up tabs which hold burner rings in position and remove burner ring section and low fire
rings. Tabs are used only to keep burner rings in place during shipment.
c. Examine burner ring sections and low fire segments. Replace all warped or burned out-of-shape rings. Clean
rings with a wire brush.
d. Use a wire brush to clean carbon from burner. Do not scrape carbon from sides of burner. Clear clogged holes
with a toothpick. Remove all carbon from burner.
CAUTION
Do not use metal pick on holes in the sides of the burner as this will enlarge them.
e. Remove drain plug (6, fig. 4-3) and clean oil inlet pipe of
all carbon with a
wire. Hold oil inlet tube with a
wrench
when removing plug. Replace drain plug securely after cleaning. Clean inside of combustion chamber if there is a
heavy accumulation of soot or carbon.
4-20. Burner Parts Replacement
a. Replace one low fire ring (3, fig. 4-3) in
burner between ring dividers. The word TOP on
ring must be in
the up
position. Rings must rest on three studs on wall of burner. Replace other rings m the same manner.
b. Replace two piece burner ring evenly and securely on burner top rim. Convex side of ring must be upward.
4-6