2. THERMOSTAT CONTROL
1. Slacken the tubing nuts at the inlet and outlet of the thermostat body.
2. Slide the thermostat phial out of the case fixing bracket behind the back panel at the lower L.H. corner, pull down
the r.h. end and slide it out of it’s locating clip.
3. Disconnect the gas supply tube at the control tap, and unscrew the two injector mounting screws at the l.h. side
of the heater.
4. Unscrew the two screws fixing the thermostat mounting bracket to the back flange of the heater, and slide the
whole assembly out to the left and forward when the injector is clear of the heat exchanger (retain the sealing
gasket), taking care not to damage the trailing thermostat phial.
5. Noting the orientation of the thermostat in it’s bracket, remove (one fixing nut) and fit the replacement. Transfer
the two tubes to the new thermostat (do not fully tighten).
7. Feed the assembly back into the heater, taking care to engage the injector housing (complete with it’s sealing
gasket) and the supply tube into the gas control. Re-fit the injector holder fixing screws and tighten the supply tube
compression nut at the gas tap.
8. Re-fit the mounting bracket fixing screws, and tighten the tubing nuts at the inlet and outlet of the thermostat.
9. Re-fit the thermostat phial, in reverse order of removal. Do not uncoil more than is required to locate the phial
and tidy the coils after locating the phial.
Thermostat phial
fixing clip
Phial location between back panel and wall,
lower L.H. side of heater
fixing clip
locate in innerface of case fixing bracket
3. THERMOCOUPLE
1 Release the tubing nuts on the copper thermocouple phial at the rear of the control and at the pilot assembly.
2. Remove the thermocouple, fit the new one and refit the two tubing nuts. Make sure that the thermocouple is
pushed fully home into the pilot assembly before tightening the nut.
