Servicing; Burner Assembly; Gas Control Valve - andrews RSC 150 Installation And Operation Manual

SECTION 6
BURNER
ASSEMBLY
GAS
CONTROL
VALVE
Fig. 9
Replacement of
Gas Control
18

SERVICING

Whilst giving the following instructions for the care of the Andrews Water Heater, we
would recommend that an arrangement is made with your local gas region or installer to
carry out periodic checks of the appliance to ensure trouble free operation and continued
satisfaction.
The burner assembly should be cleaned and checked annually as follows:-
1. Depress slightly the gas control knob and turn to "OFF". Remove the outer burner
cover and the inner door. Remove the IO fixing screws to remove the inner cover.
2. Disconnect from the bottom of the control valve the 'pilot tube, thermocouple and
main burner supply tube. Withdraw the burner assembly from the heater.
3. Remove the screw securing the pilot assembly to the main burner.
4. Remove the gland nut connecting the pilot tube to the pilot assembly. Withdraw the
pilot tube and remove the pilot restrictor from the end. Clean the pilot restrictor with
acetone and blow through the pilot burner with compressed air.
5. Remove the two screws securing the main burner supply tube to the bottom of the
burner to gain access to the main jet. Remove the main jet and clean with acetone.
Blow through the main burner with compressed air.
DO NOT ATTEMPT TO CLEAN ORIFICES WITH SHARP METALLIC OBJECTS, IF
NECESSARY, USE A WOOD SPLINTER TO CLEAR.
6. Re-assemble in the reverse order of steps 2 to 5 but note:
i) Be sure to engage the rear section of the main burner supply pipe in its location
bracket on the base pan of the heater.
ii)
DO NOT OVERTIGHTEN THE THERMOCOUPLE CONNECTION, SCREW IN
FINGER TIGHT AND TIGHTEN A FURTHER 1/4 TURN USING A SPANNER.
7. Turn the control knob to "PILOT" and depress. Using a leak detection fluid check the
joints at both ends of the pilot supply tube. Seal if necessary.
8. Allow 3 minutes for any unburnt gas to disperse and light the pilot flame, check that
the flame is correct, see Fig. 7 and turn the control knob to 'ON', the main burner will
light.
9. Check the main burner tube connection at the control valve with leak fluid and seal if
necessary. Replace the outer cover.
This should be checked and serviced by an engineer fully conversant with every aspect of
this piece of equipment.
To remove gas control, first
drain appliance, disconnect
gas pipe union and turn
control anti clockwise, taking
care not to damage threads,
knobs or the valve itself.