To Remove Ignition Transformer - See Fig. 26.
a. Isolate electrical supply (switch
OFF
and remove
plug), remove the side cover panel via its fixing screws.
b. Open outer burner door.
c. Remove glo-coil cable locking nut and detach both
cable leads from go-coil termination spindle.
d. Detach transformer primary cable leads from terminal
block with earth lead.
e. Remove transformer securing screws and withdraw
transformer.
f. Replace transformer in reverse manner of dis-
assembly and remake electrical connections.
To Remove Glo-Coil Ignitor - See Fig. 16.
a. Isolate the electrical supply (switch
OFF
and remove
plug).
b. Open outer burner door.
c. Remove glo-coil cable locking nut and detach both
cable leads from go-coil termination spindle.
d. Using a spanner on hexagon skirt of glo-coil body,
slacken and withdraw glo-coil.
e. Replace with new go-coil in reverse manner of dis-
assembly and remake electrical connections.
To Remove Sequential Control Panel - See Fig. 27.
a. Isolate the electrical supply (switch
OFF
and remove
plug).
b. Pull and remove two thermostat knobs - Fig. 15 or 16.
c. Remove side cover panel via its four fixing screws -
Fig. 16.
d. Remove the cable clamp straps via fixing screws.
e. Disconnect all electrical connections on terminal
blocks and the nuts on earth posts.
f. Slacken the two top screws and one bottom screw
securing the control panel to the L.H. side plate.
g. Fit replacement control box in reverse order of
dismantling, ensuring that all the cable connections are
fitted to their respective terminal strip positions.
Finish re-assembly of appliance.
With the oil valve trip lever depressed
ON
, the knob in the
oil control valve set No.6 oil will flow to the cooker burner.
It is intended that the cooker burner be operated on a
‘high-low’ oil rate basis, with idling oven temperatures
obtained by a thermostat knob setting of ‘
LOW
’ (oven
temperature 135ÞC approx.), without the use of electrical
power.
Setting the thermostat knob from
LOW TO MAX
will
cause the thermostat to switch electrical power
ON-OFF
automatically and vary the oil rate to provide a selected
oven temperature, thermostatically controlled.
See Users Instructions for details of thermostat knob
settings and oven temperatures.
Despite the loss of electrical power, high oven cooking
temperatures can still be obtained, but oven temperature
control must be manual only.
Method:
Holding the actuating lever on the top of the oil
control valve, push it to left and engage it in the notch of
the cover.
Ensure the knob on the oil control valve is set at No.6
setting to obtain maximum oil rate and adjust later to suit
temperature requirements.
Electrical thermostat control will not be possible until the
actuating lever is dis-engaged and the oil control valve
knob is returned to No.6 setting.
Because the control system is basically simple, only two
electrical malfunctions are likely to occur, namely:-
1. Oven thermostat malfunctions and must be replaced.
2. Oil control valve electric top, bi-metal heater element
fails. The complete electric top must be replaced.
The operation of the boiler burner is under the overall
control of an electronic sequential control box, whose
function is to provide the following service:-
1. A purpose-made orderly timing sequence of electrical
signals, to various electrical controls, to enable the boiler
to cycle upon boiler thermostat demand.
2. To recognise an electrical control malfunction or
condition and prevent the timing sequence continuing, by
causing a lock-out condition. With the oil valve trip lever
depressed
ON
, oil will exit from the oil control valve as far
as the de-energised main and pilot solenoid valves only.
NOTE: WHERE THERE IS A LIKELIHOOD OF
AIRLOCKING SUCH AS INITIAL COMMISSIONING OR
REPLACEMENT OF CONTROLS, PREPURGE THE
PILOT AND MAIN OIL FEED PIPES OF AIR BY
BREAKING THE PIPE JOINTS AT THE BOILER
BURNER FRONT.
19
Fig.27
DESN 510389
BOILER OPERATING SEQUENCE
COOKER ELECTRICAL FAULTS
COOKER OPERATING SEQUENCE
ELECTRICAL POWER FAILURE
