Servicing; Introduction; Burner Assembly Standard Range; Burner Assembly Hi-Flo Range - andrews 32/143 Installation Manual, Operation And Service Manual

SECTION 6

INTRODUCTION

PRE-SERVICE
OPERATIONS
BURNER
ASSEMBLY
STANDARD
RANGE
BURNER
ASSEMBLY
HI-FLO RANGE

SERVICING

Servicing must be carried out by a properly qualified person.
Whilst giving these instructions for the care of the Heater, it is recommended that checks
are carried out by the installer or local gas authority, at least annually. Ensure good
ventilation by keeping the heater free of extraneous materials and clear of dust and lint.
Keep pipework, flue and tops of heaters clear of any combustible materials. A water
softener or lime inhibitor should be employed in hard water areas. The heater should be
inspected every few months via the hand hole cleanout and lime or silt deposits removed.
Failure to do so will shorten heater life and may invalidate the warranty.
NOTE! The cleanout hole gasket must be renewed whenever the cover is removed. (C694)
(See parts lists pages 46-49)
Before servicing, carry out the following operations.
1) Turn off the gas service cock.
2) Turn off the cold water supply to the heater.
3) Turn on the hot water draw-off taps served by the water heater, or, for multiple
installations, turn off the hot water outlet connection valve and secondary return valve.
4) Drain down using the drain valve on the heater.
The burner assembly should be checked and cleaned annually.
1. Depress gas control knob and turn to OFF. Remove outer burner cover and slide inner
door to the right. On models 63/62 and 84/87, remove two screws to release the
inner cover.
2. Disconnect pilot tube, thermocouple and main burner supply tube from bottom of control
valve. Withdraw burner assembly from heater.
3. Remove screw securing pilot assembly to main burner.
4. Remove gland nut securing pilot tube to pilot assembly. Withdraw pilot tube and remove
pilot restrictor. Clean pilot restrictor with acetone and blow through pilot burner with
compressed air.
5. Remove two screws securing main burner supply tube to bottom of burner to gain access
to main jet. Remove main jet and clean with acetone. Blow through main burner with
compressed air.
CLEAN ORIFICES WITH WOOD SPLINTER. DO NOT USE SHARP METALLIC OBJECTS.
6. Re-assemble in reverse order of steps 2 - 5, but note:
i) Be sure to engage rear section of main burner supply pipe in it's location bracket on
base pan of heater.
ii) DO NOT OVERTIGHTEN THE THERMOCOUPLE CONNECTION. SCREW IN FINGER
TIGHT THEN TIGHTEN A FURTHER 1/4 TURN USING A SPANNER.
III) Replace and secure inner cover with two screws on Models 63/62 and 84/87.
7. Turn gas control knob to PILOT and depress. Using leak detection fluid, check joints at
both ends of the pilot supply tube. Seal if necessary. DO NOT EXAMINE WITH A NAKED
FLAME.
8. Allow 3 minutes for unburnt gas to disperse. Light the pilot and check flame is correct.
(see Fig. 19, p26). Slide inner door to left (on Models 63/62 and 84/87, lower the
inspection port) and turn gas control knob to ON. The main burner will light.
9. Check main burner connection tube at control valve with leak detection fluid and seal if
necessary. Replace outer cover.
The burner assembly should be checked and cleaned annually.
NOTE! Models 62/341, 54/418 and 54/440 are fitted with an anchor bracket between the
burner manifold and heater body. Take out 2 screws to remove.
1. Turn gas control valve knob to OFF and disconnect union joint from gas service cock.
2. Disconnect thermostat connections (black, red and white wires) from gas control valve.
3. Remove two screws and slide out burner assembly.
4. Disconnect pilot tube and thermopile connections from gas valve. Remove two screws
and withdraw pilot/thermopile assembly.
5. Unscrew two wing nuts and remove draught shield. Remove four screws and disconnect
manifold from burner tray.
6. Clean burners by brushing internally and externally and by blowing through with
compressed air. Do not remove individual burners from the burner tray.
7. Remove the burner and pilot injectors and clean with acetone. CLEAN ORIFICES WITH
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