12
Explaination of the Controls System
The fryer has a gas control system for each burner, centering around the `electronic ignition / valve
control module'. When the system is switched on, the electronic control turns on the blower and checks
for air pressure. Once blower air pressure is verified, gas valves are opened to supply gas to the burners
and the ignition sparking starts. The ignition control senses for burner ignition with the flame electrode
and providing ignition has occurred successfully, the burners will stay on and the fryer will heat up to the
set temperature.
The thermostat provides power to both the electronic controls when the fryer is below the set
temperature. The burners will be shut down when the set temperature is reached and re-started when the
temperature drops below the set temperature again.
The over-temperature control provides a closed circuit, via the over-temperature relay, to both the
electronic controls, unless the fryer exceeds allowable temperature. When tripped, the burners will shut
down. Allow the fryer to cool to below 200ºC and the over-temperature will automatically reset, allowing
the fryer to operate again. Tripping of the over-temp indicates a fault condition that should be repaired.
The flame rod allows the electronic control for that burner to sense the continuity to earth of the ionised
flame. If the flame does not ignite, the reset light on the control panel on that side will show. If the flame
goes out the electronic control will spark to re-ignite the flame, if the flame does not ignite, the reset light
on that side will show. After operating the reset switch (next to the main power switch behind the front
door. Refer to Fig 3) for that side, the electronic control will start the ignition sequence again.
Air pressure switch. Each burner ignition sequence, whether first time or repeat heat cycling, requires that
the blower air pressure starts at zero. Once verified, the ignition control turns on the blower and confirms
air pressure after the blower has been ‘ON’ for approx 5 seconds. The burner ignition then starts normally.
NOTE: When cycling, during operation, a delay may occur if the ignition module senses air
pressure from the blower as it slows down from the last cycle. In this case, the
ignition module will wait until the blower air pressure has dropped (approx. 5 secs),
then the ignition will restart automatically. Accordingly, a slight delay may be
experienced when the thermostat calls for heat and as each burner operates
independently, both burners may not always cycle on at exactly the same time. They
may cycle on 2-5 seconds apart.
Apart from the thermostat and over-temp, the control / burner systems operate independently, allowing
one side to continue operating even if the other side is shut down on a fault. Although this seems simple,
very often a problem can be hard to resolve.
Following the Fault Finding Guide will enable a quick
narrowing down of possible causes and lists appropriate solutions.
Operation
C
AUTION
:
Turning ‘OFF’ the thermostat does not turn ‘OFF’ the main power to the fryer.
The power should ALWAYS be turned off at the main power switch located
behind the access door.
