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SECTION 3 - SERVICING and
CONVERSION
Important
BEFORE ATTEMPTING ANY SERVICE OPERATION,
TURN OFF ISOLATING COCK AND TAKE STEPS TO
ENSURE IT IS NOT INADVERTENTLY TURNED ON
DURING TASK.
ENSURE UNIT HAS COOLED SUFFICIENTLY TO
ALLOW SAFE MAINTENANCE TO BE CARRIED OUT.
AFTER ANY SUCH MAINTENANCE TASK, CHECK
UNIT TO ENSURE THAT IT PERFORMS CORRECTLY
AND CARRY OUT ANY NECESSARY ADJUSTMENTS
AS DETAILED IN SECTION 1.
After carrying out any servicing or exchange of gas
carrying
components
TIGHTNESS!
3.1 GAS CONVERSION CHECK LIST
For conversion to NATURAL GAS, add governor and
pipe and set burner pressure.
For conversion to PROPANE GAS, remove governor
from gas circuit and fit replacement supply pipework.
Other considerations :
CHANGE INJECTORS
ADJUST BY-PASS SCREW AND SET LOW RATE
CHANGE DATA PLATE
3.2 TO REMOVE CONTROL PANEL
Remove control knob and fixing bracket. Undo fixings
from underside. Ease panel out and down to clear top
locating pins.
3.3 BURNERS
3.3.1 To Remove Burner Assembly
Remove pilot assembly to gain access to burner.
Undo union supply pipe at burner inlet.
Remove fixings that secure burner brackets to cast iron
base plate and lower burner away from base.
3.3.2 To Remove Pilot Burner Assembly
Undo pilot and thermocouple unions from gas valve.
Also remove nut that retains igniter lead to electrode
(see Figure 2).
Undo pilot burner bracket from below burner. Withdraw
pilot burner assembly from unit.
Undo fixings to remove pilot burner from bracket.
-
ALWAYS
CHECK
3.4 INJECTORS
3.4.1 To Remove Burner Injector
Remove injector, located inside air box of burner with a
16mm short armed spanner.
Note
When cleaning injector orifice, a soft fuse wire or wooden
splint should be used.
METAL REAMERS MUST NOT BE USED TO AVOID
ENLARGING THE ORIFICE.
3.4.2 To Remove Pilot Injector
Undo pilot union at pilot end of supply pipe and withdraw
pipe from pilot burner (see Figure 2).
The injector is located by pilot pipe and care must be
taken to avoid losing this upon withdrawal.
GAS
3.5 TO REMOVE THERMOCOUPLE
Undo thermocouple retaining nut from pilot burner and
slide thermocouple from pilot block (see Figure 2).
Remove thermocouple nut at gas tap body.
Note
When replacing, union nut on gas valve end must be
finger tight plus one sixth of a spanner turn.
DO NOT OVERTIGHTEN.
3.6 PIEZO IGNITER / SPARK ELECTRODE
3.6.1 To Remove Piezo Igniter
Pull off lead connection and remove fixings that secure
igniter to bracket.
3.6.2 To Remove Spark Electrode
Undo
electrode
(See Figure 2).
3.7 GAS VALVE
3.7.1 To Remove Gas Valve
Ensure knob is in OFF position.
Undo unions on inlet and outlet of valve, loosen unions on
pilot supply and thermocouple.
Remove fixing at RH side of spindle and push valve back
to clear mounting panel. Remove valve through bottom
compartment.
retaining
nut
and
withdraw
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