1. Connect pressure gauge to nipple
N
. Initial cold start
should indicate a cold pressure reading of 3.1mm w.g.
(0.125in w.g.) which on hot cycling, should rise to a stable
4.1mm w.g. (0.165in w.g.).
2. Adjust excess air pressure via air pressure adjustment
flap on top of air duct at the L.H. side of cooker. (See fig.
11) No adjustment of the air pressure switch is needed.
If pressure is low, remove plastic sensor tubes from Fan
Scroll and Fan Duct, and connect a differential pressure
gauge across the nipples. This reading should register
between 9-11mm water gauge with duct fully open. This
should confirm whether the fan performance is adequate.
If the fan performance is not confirmed, there must be a
windbox air leak. Investigate by removal of the boiler
burner assembly for examination of the underside gasket
seal.
IMPORTANT
: BEFORE COMMENCING, ISOLATE THE
ELECTRICITY SUPPLY (SWITCH
OFF
AND REMOVE
PLUG) AND THEN TURN
OFF
THE OIL SUPPLY AT
THE ISOLATING VALVE NEAR TO THE APPLIANCE.
3. Disconnect pressure gauge and replace plug nipple.
Fail-safe protection has been built into the Sequential
Control so that in the event of any deviation from the
timing programme, or component malfunction, a lock-out
condition occurs, with the display of lamp
L
.
Interruption of the Sequential Control power with the
exception of the continuous running fan.
To cancel the lock-out condition, turn the boiler thermostat
knob from
ON
to
OFF
, then back to
ON
. The cycle will
then re-commence.
WAIT 3 MINUTES BEFORE TURNING THE
THERMOSTAT KNOB ON.
Continued lock-out indicates a malfunction that requires
qualified inspection - See Fault Finding Chart.
Check that:-
1. The boiler system is full of water and all valves are fully
open.
2. Any room thermostat is
ON
.
3. Any programmer or time switch is set at continuous
heating.
4. Ensure the electricity supply is
ON
, that the pump is
running and the boiler thermostat set at 80°C (180°F).
5. Allow the heating system to warm up then set the
pump adjuster to maintain a boiler ‘flow and return’
temperature differential of 10°C-14°C (18°-25°F). Checks
must be made by the installer to see that this differential
is obtained after the boiler ‘Flow’ temperature is stabilised.
The system should be balanced by regulating the water
flow rate through individual heat emitters to ensure a
satisfactory water temperature at each emitter. A system
balance must also be made, so that the minimum flow
required through the boiler is achieved when supplying
D.H.W. only.
6. When the water system reaches working temperature,
check that the boiler thermostat operates satisfactorily.
Check that any room temperature controls and
programmer or time switch are fully operative.
7. Examine the system for water soundness. The system
should then be turned off and rapidly drained while still
hot.
The water system should again be filled and cleared of all
air locks.
It is recommended that a corrosion inhibitor is added to
protect the heat exchanger and pipe work.
1. Depress the trip lever
D
on the front of the oil control
valve and turn the cooker oil control knob
C
to No.6
setting.
NOTE:
THE ACTUATING LEVER
B
ON THE ELECTRIC
TOP MOUNTED ON THE OIL CONTROL VALVE TOP,
PERMITS MANUAL CONTROL TO OBTAIN MAXIMUM
OIL FLOW RATES IN THE EVENT OF POWER FAILURE
AND DEPRIVATION OF THERMOSTAT USE, ENGAGE
THE ACTUATING LEVER
B
BY PUSHING TO THE LEFT
AND ENGAGING IN THE NOTCH OF THE COVER. THIS
ALLOWS THE ACTUATING PLUNGER BUTTON TO
EXTEND UPWARD AND GIVE HIGH FIRE OIL RATE.
USE ACTUATING LEVER WITH POWER FAILURE
ONLY.
2. Switch power
ON
and set oven thermostat knob
A
to
maximum.
3. With the outer door
E
open, remove/lift out the cooker
burner door
F
.
4. After allowing 15 minutes for oil to settle in the cooker
burner base, open the lighting cover
G
on front of burner
shells to expose a lighting port. Fig. 13.
5. Light the front wick through the lighting port and close
the lighting cover.
CHECKING THE BOILER BURNER
FAN PRESSURE
BOILER BURNER LOCKOUT
BOILER CONTROL CHECK
Fig.13
LIGHTING THE COOKER BURNER
13
DESN 510836 A
