SECTION 3 -
SERVICING and CONVERSION
Important
BEFORE ATTEMPTING ANY SERVICING, ENSURE
ISOLATING COCK IS TURNED OFF AND THAT IT
CANNOT BE INADVERTENTLY TURNED BACK ON.
FRYER REQUIRES TO BE COOLED AND DRAINED
PRIOR TO MAINTENANCE.
AFTER ANY SUCH MAINTENANCE TASK, CHECK THE
APPLIANCE TO ENSURE CORRECT PERFORMANCE
AND CARRY OUT ANY NECESSARY ADJUSTMENTS
AS DETAILED IN SECTION 1.
After carrying out any servicing or exchange of
gas carrying components -
ALWAYS CHECK FOR GAS TIGHTNESS!
3.1 GAS CONVERSION CHECK LIST
CHANGE MAIN INJECTORS
CHANGE PILOT INJECTOR
CHANGE CROSS LIGHTING INJECTOR
CHANGE DATA PLATE
To convert from natural to propane gas, remove
governor.
To convert from propane to natural gas, fit external
govenor. Adjust unit manifold pressure as detailed in
Section 1.9.2.
All relevant injectors to be changed to suit gas type.
3.2 BURNERS
Burners should be cleaned periodically to maintain
maximum performance and are best cleaned with a wire
brush. Blocked parts require to be cleared using a metal
broach. Any material pushed into burner should be
shaken out via air inlet.
3.2.1 Removal of Burner Assembly
Turn off main gas supply to unit. Remove fixings that
secure pilot and cross-lighter assemblies to main burner
and drop assemblies slightly. Disconnect compression
joint above manifold. Remove fixings that retain burner
assembly front cross strap to side runners. Pull burner
assembly forward
(approx. 25mm)
and drop it slightly to
clear front cross strap. While supporting weight of
assembly, push it back to clear rear strap from runners
and lower to withdraw. Replace in reverse order.
3.2.2 Removal of Pilot Burner
Isolate main gas supply to unit. Disconnect pilot supply
pipe compression nut and remove pipe from pilot burner.
Withdraw injector. Undo thermocouple retaining nut and
remove thermocouple from pilot burner. Pull lead from
spark electrode.
Undo nuts that secure pilot burner bracket to burner.
Withdraw pilot burner assembly. Replace in reverse
order.
3.3 CLEANING THE INJECTORS
Injectors should be periodically cleaned using a wooden
splinter or soft wire. Avoid use of metal reamers as these
may distort or increase size of orifice.
3.3.1 Removal of Main Burner Injectors
Isolate main gas supply.
Use a 10mm open-ended spanner to remove injector.
3.3.2 Removal of Pilot/Cross-Lighting Injectors
Isolate main gas supply. Undo pilot/cross lighter supply
pipe compression nut and remove pipe from pilot/cross
lighter burner.
Withdraw injector. Replace in reverse order.
3.4 FLAME FAILURE THERMOCOUPLE
Undo nuts at pilot assembly and valve body brass
interruptor.
Disconnect white wires from thermocouple to safety
thermostat.
3.5 PIEZO IGNITER/SPARK ELECTRODE
The igniter is a piezo spark type. The electrode is
mounted upon pilot burner bracket. Push button
is located below valve mounted to control panel inside
door at RH side.
Two wires are connected to push button at one end.
One is orange in colour and the other is a green/yellow
earth wire. Both must be connected at each end for
igniter to function properly.
3.5.1 Removal of Igniter Switch
Remove igniter and earth lead connections from push
button. Undo large nut that that secures push button
flange to control compartment and remove device.
Replace in reverse order.
3.5.2 Removal of the Electrode
Remove igniter lead connection from electrode and
remove nut located below electrode. Withdraw electrode
downward from pilot burner bracket.
Replace in reverse order.
