andrews RFF190 Installation Manual, Operation And Service Manual page 24

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. Move the gas service cock to "OFF". Isolate from the electrical supply. Unhook and
remove the outer door. Remove inner door by sliding it to the side on the RFF190
model, or by removing two screws on the RFF280 model.
2. Disconnect from the bottom of the gas control valve, the pilot tube, thermocouple,
bleedline and main burner supply tube. Withdraw the burner assembly from the
heater complete with blue ignition lead, disconnect from gas control panel.
3. Remove the screw securing the pilot assembly to the main burner supply tube.
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 and
blow through the pilot burner with compressed air.
5. Remove the main burner pipe jet assembly from the burner by rotating jet
anticlockwise, remove jet and clean. 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 pins of the main burner on the RFF280 model or the
flattened flange of the main burner supply tube on the RFF190 model into their
proper locations in the bracket on the base pan of the heater.
7. Re-light and carry out commissioning check as pages 16 and 17.
SECTION 6
BURNER
ASSEMBLY
19