FireLake 155 Owner's Manual page 42

For a more thorough service the aluminum preheat block can be cleaned. The need
to increase oil pressures to maintain a good flame is a indicator block passages may
be restricted. How quickly a block becomes restricted varies with hours of use and
oil quality. Block cleaning is a skilled service that inexperienced persons should
not undertake. Improper methods could damage threads or passageways. Consult
your dealer if you think this operation is needed on your burner.
ALUMINUM PREHEAT BLOCK
NOZZLE END
NOZZLE ADAPTER RECESS
CAP SCREW TAP HOLES (4) AIR PORT, OIL/NOZZLE PORT
OIL BOX END
OIL PASSAGE TO FRONT OF
BLOCK
160 DEGREE STAT TAP
RETURN OIL PASSAGE FROM
FRONT OF BLOCK
140 DEGREE STAT TAP
OIL PASSAGE TO FRONT OF
BLOCK
300 WATT HEATER PORT 130 WATT HEATER PORT
OIL BOX END
OIL FROM SOLENOID INTO
BLOCK AND ON TO NOZZLE
OIL FROM REGULATOR OR OIL
PUMP ENTERS & GOES TO
FRONT OF BLOCK
OIL FROM FRONT OF BLOCK
COMES OUT TO SOLENOID
UNDER BLOCK IS TAPPED PORT FOR AIR FROM REGULATOR TO GET INTO BLOCK
Page 42 of 42