Servicing; Introduction; Pre-Service Operations; Burner Assembly - andrews OFS25 Installation Manual, Operation And Service Manual

SECTION 6

INTRODUCTION

PRE-SERVICE
OPERATIONS
BURNER
ASSEMBLY

FLUEWAY

24

SERVICING

Servicing must be carried out be 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 at least every 6 months. 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 and 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.
(See parts lists pages 32,34,36 & 38).
Before servicing, carry out the following operations.
1. Turn off the fuel supply to the heater.
2. Turn off the electrical supply to the heater.
3. Turn off the cold water supply to the heater.
4. 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.
5. Drain down using the drain valve on the heater.
The burner should be checked every 6 months and if necessary cleaned as follows:
1. Inspect fuel tank and drain any water contamination
2. Clean fuel filters (replace if necessary)
3. Remove the burner from combustion chamber
4. Remove all carbon from burner parts. Pay particular attention to electrode and nozzle
(replace if necessary). Remove all dust/dirt from burner fan
5. Clean HT leads and check condition
6. Clean photo-cell
7. Check condition of control box terminals, check security and condition of wiring
8. Clean pump filter. Check condition of fuel pump drive dog, ensure pump is fitted
correctly when assembling burner. Ensure burner settings are correct
9. Check combustion chamber condition, every 6 months
The flueway should be checked every 6 months and if necessary cleaned as follows:
1. Remove burner assembly complete
2. Disconnect the flue/flue stabiliser from heater
3. Inspect and clean the secondary flue installation as necessary
4. Lift out the baffle/baffles from inside the central flueway
5. Clean the flueway with a brush and clean any deposit from the underside of the
storage vessel bottom and from the flue baffle
6. Re-assemble in the reverse order
7. Re-light and carry out commissioning check