Technical data

19
SERVICING INSTRUCTIONS
To ensure the continued efficient and safe operation of the boiler, it is recommended that it is checked and
serviced at regular intervals. The frequency of servicing will depend upon the installation conditions and usage
but, in general, once a year should be enough.
It is the law that any servicing is carried out by a competent person.
ROUTINE CLEANING AND INSPECTION
• Operate boiler and check for any faults that need to be put right.
• Isolate boiler from the gas and electrical supplies.
• On completion check all gas carrying parts for soundness with leak detection fluid.
Remove boiler casing as follows:
Outer casing
• Undo screw securing the casing underneath boiler and remove outer
casing by pulling forwards, lifting it up and off.
Sealed chamber
• Unclip two clips holding sealed chamber cover to boiler and lift it for-
wards and off.
Side covers
• Undo 3 screws securing each of side covers and remove outer covers
by pulling to side, forwards and off.
Sealed chamber
• Unclip two clips holding sealed chamber cover to boiler and lift it up
and off, see diagram 16.
Cleaning the burner
• Unscrew and remove 6 screws securing combustion chamber cover and remove cover.
• Disconnect flame sense electrode at burner.
• Disconnect ignition lead at gas valve module.
• Disconnect ignition earth lead.
• Undo nuts (A) securing gas supply pipe between burner
and gas valve and remove pipe, see diagram 17.
Note: The washer between the burner and burner gas supply
must be kept to use on reasembly.
• Unscrew 2 screws (B) securing burner to base of sealed
chamber.
• Pull main burner up and forward out of boiler.
• Examine and clean burner as necessary.
Note: DO NOT use a wire or sharp instrument on the holes.
Heat exchanger
• Locate the heat exchanger inside the sealed chamber.
• Gain acces to heat exchanger by removing fan and flue
hood.
• Examine heat exchanger for any blockages or build up of deposits.
• Clean heat exchanger with soft brush or vacuum cleaner.
Reassembly of parts removed for servicing
All parts are replaced in reverse order to removal.
Flue system
• Check externally to make sure that flue is not blocked.
• Inspect flue system to make sure that all fittings are secure.
Operation of fan
• Switch on electrical supply and turn on gas.
• Remove sealed chamber cover.
• Light burner by operating external controls (if fitted) to call for heat.
• Check that fan operates when burner lights and stops when it goes out.
Diagram 16
Diagram 17