| Tweet |
Custom Search
|
|
|
||
 (a) Lubricate
in
accordance
with
LO
(f) Remove nipple (27).
551925-204-12.
(g) Withdraw the ignition and sleeve
(b) Inspect ac and dc brushes on
assembly from lower housing (14).
motor/converter. Replace brushes worn to one-half normal
(2) Disassembly.
length.
(a) Unscrew nozzle (20) from nozzle
(c) Clean lint and debris from fan.
adaptor (22). Remove nozzle strainer (21). Remove stem
(d) Inspect fuel pump for evidence of
from nozzle.
leakage. Tighten any loose screws.
(b) Loosen setscrew in clamp (38) and
carefully withdraw electrodes (39).
NOTE
(3) Cleaning and inspection.
Do not disassemble motor/converter or
(a) Clean nozzle strainer in clean fuel oil.
fuel pump in the field. Replace defective
(b) Wash all nozzle parts thoroughly in dry-
units.
cleaning solvent in conformance with FED SPEC P-D-680.
(3) Removal of motor and fan.
NOTE
(a) Disconnect electrical connections from
Deposits in slots and orifice are difficult to
motor.
remove, the deposits are varnish and gum
(b) Remove mounting screws and withdraw
motor and fan assembly from upper housing (4, fig. 5-111).
formed by the oil under operating
(4) Removal of fuel pump.
conditions. A round tooth pick is an ideal
(a) Disconnect fuel inlet and outlet lines
cleaning tool for removing these deposits.
from fuel pump (8).
CAUTION
(b) Remove mounting capscrews (7) and
Never use a material harder than wood to
lockwasher (6). Withdraw fuel pump and flexible coupling (5)
clean nozzles. Use of harder materials will
from upper housing.
result in permanent damage to the
(c) Remove setscrew from coupling (5) and
nozzles.
pull coupling from fuel pump shaft.
(c) Clean electrodes with solvent in
(5) Installation. Installation is in reverse order of
accordance with FED SPEC P-D-680. Examine electrodes for
removal ((1 above).
cracked porcelain or badly burned tips. Replace defective
d. Stack Switch.
electrodes.
(1) General. The stack switch, located on the
(4) Assembly.
smokepipe at the rear of the boiler, provides complete safety
(a) Assembly of nozzle is in reverse order
combustion control for the oil burner. It provides automatic
of disassembly. Tighten stem securely in nozzle tip. Seat
lockout in case of flame or ignition failure, and automatic
nozzle securely to nozzle adaptor.
recycling in case of power failure (does not lock out).
(b) Slip electrodes into mounting clamp
WARNING
and tighten clamp.
After extended period of shutdown, test
(c) Insert sleeve assembly into housing to
operation of stack switch before placing
edge of manifold.
heating unit in operation.
(d) Install nipple (27) and connector (26).
(2) Test.
(e) Set cover plate in position on housing
(a) Remove screws from mounting flange
and fasten with thumbscrew, screws, and washers.
and withdraw stack switch from smoke pipe.
(f) Install adjusting bracket over fuel
(b) Start the heating unit and measure time
connection, and insert thumbscrew into cover plate through
intervals from burner ignition to shutdown.
slot in adjusting bracket. Do not tighten.
(c) If burner does not shutdown within 2
(g)
Set adjusting bracket so that pointer is aligned
minutes, turn heating unit supply switch OFF, replace stack
with position A on cover plate. Tighten thumbscrew.
switch ((5) below) and repeat test.
c. Fuel Pump, Blower Motor, and Fan.
(d) If burner does shutdown automatically
(1) General. The oil burner fan (3, fig. 5-111)
within 2 minutes, wait 5 minutes after shutdown then install
and fuel pump (8) are driven by the motor/converter (2),
stack switch in mounting and fasten with mounting screws.
which, in addition to driving these units, furnishes ac voltage
This test indicates that ignition and flame failure features are
to the transformer from which 10,000 volt ignition voltage is
operative.
supplied to the electrodes. The fan is mounted on the motor
(e) Press reset button, burner should ignite.
shaft, and the fuel unit is driven through a flexible coupling
(f) Allow boiler to heat, then place heating
(5).
unit supply switch in OFF position.
(2) Maintenance and adjustment.
(g) Place heating unit supply switch in ON
position. Unit should not start for several minutes
5-154
|
||
|
||
