11
Controls
If gas control fails to operate, check the following;
1.
The thermocouple is in the pilot flame. The thermocouple must be hot in order to generate energy to
operate an electromagnetic system to lift and maintain open the control valve.
2.
To do so, it is necessary to generate approximately 650 milli-volts. If not functioning correctly, the
thermocouple should be replaced.
3.
Check both main and safety thermostats switching systems. If thermostat is malfunctioning, it should
be replaced.
Thermostat
1.
Pull thermostat knob off and unscrew thermostat from control panel.
2.
Remove control panel.
3.
Remove both terminals from the thermostat.
4.
Remove thermostat capillary gland and remove thermostat bulb.
5.
To fit new thermostat, reverse the above procedures
Pilot Assembly
1.
Undo the two screws holding the pilot bracket assembly located on the front shield behind the gas
valve.
2.
Gently pull the pilot assembly bracket down and outwards.
3.
To change thermopile
a. Undo locking screw holding thermopile to pilot assembly bracket and gently pull the
thermopile down.
b. Undo terminal
screws on located on ‘TH TP’ and ‘TP’ on main gas valve.
c. Replace with new thermopile and assemble in reverse order.
4.
To change thermocouple
a. Undo locking screw holding thermocouple to pilot assembly bracket and gently pull the
thermocouple down.
b. Undo thermocouple screw located in the main gas valve.
c. Replace with new thermocouple and assemble in reverse order.
5.
To change new pilot assembly
a. Follow steps 1 and 2.
b. Undo the two screws on the pilot mounting bracket and pilot bracket.
c. Follow procedures 3. A. and 4. A. listed above.
d. Remove piezo lead from piezo.
e. Undo pilot gas flexible tube.
f.
Change pilot assembly over and reassemble in reverse order.
Piezo Assembly
1.
To change piezo ignitor
a.
Undo the piezo screw located on the back of the piezo ignitor located on the bottom right
hand side of the main gas control
b.
Gently remove piezo lead from rear of piezo ignitor
c.
Replace piezo ignitor and replace in reverse order
2.
To change piezo lead
a.
Gently remove piezo lead from rear of piezo igitor
b.
Gently remove piezo ignitor lead from pilot assembly
c.
Replace with new lead and assemble in reverse order.
Burners
1.
To change/service burner (ensure burner is cool to prevent injury to service person)
a. Undo the wing nut(s) located on the front burner support channel.
b. Gently lift the front section on an angle and pull forwards so that the rear of the burner is
removed off the burner injector.
c. Allow the rear section of the burner to fall outside the combustion chamber and move
