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7 Instructions to the User
Instruct and demonstrate the safe and efficient operation of theboiler, heating system and domestic hot water system.Advise the user, that to ensure the continued efficient and safeoperation of the boiler it is recommended that it is checked and
serviced at regular intervals.The frequency of servicing will
depend upon the particular installation and usage, but in general
once a year should be enough.Draw attention, if applicable, to the current issue of the currentissue of the Gas Safety (Installation and Use) Regulations,
Section 35, which imposes a duty of care on all persons who letout any property containing a gas appliance.It is the Law that servicing is carried out by a competent person.
Advise the user of the precautions necessary to prevent damageto the system and building in the event of the heating system
being out of use during frost and freezing conditions.Reminder - Leave these instructions and the “Benchmark”logbook with the user.REMEMBER, When replacing a part on this appliance, use onlyspare parts that you can be assured conform to the safety andperformance specification that we require. Do not usereconditioned or copy parts that have not been clearly authorised
by Hepworth Heating Ltd.Notes: To ensure the continued efficient and safe operation ofthe boiler it is recommended that it is checked and serviced asnecessary at regular intervals. The frequency of servicing will
depend upon the particular 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 competentperson.Before servicing turn off the gas and isolate the electrical supplyto the boiler.After completing a service always test for gas soundness andcarry out functional check on controls.Unless stated otherwise all parts are replaced in the reverseorder to removal.
8 Servicing
8.3 Main Burner
Disconnect the pilot pipe union connector.Remove the pilot burner securing nut and shakeproof washer.Remove the pilot burner assembly taking care not to damagethe electrode and lead assembly, see diagram 8.3.Remove the wing nut from the burner support bracket, seediagram 8.4.Remove the main burner from the main injector at the rear.
70445855 8.1 Access
Refer to diagram 6.6 and slide the controls cover forwards and
off.Remove the outer case, see diagram 6.5.Note: As an aid to Servicing the air pressure switch tubeconnection can be used to obtain a products of combustionreading.Remove the RED tube from the connection on the air pressureswitch and insert the analyser probe into the tube.Switch on the electrical supply to operate the fan and turn on thegas supply.On completion of the test switch off the electrical supply and thegas supply and reconnect the red tube to the air pressureswitch.
SECURING SCREW (2) Diagram 8.1
Diagram 8.2
8.2 Cleaning Heat Exchanger Flueways
BAFFLE(6 off)
SECURING SCREW REAR (2)(KEYHOLE SLOTS, SLACKEN SCREW)FLUEHOOD
Disconnect the air pressure tubes see diagram 5.4.Remove the blue and red electrical connections from the fansee diagram 5.4.Remove the fan complete with the fan duct extension, seediagram 5.4 and 5.7.Remove the flue hood, noting that there are keyhole slots at therear, see diagram 8.1.Remove the combustion chamber cover.Remove the burner as Section 8.3.Place a sheet of paper in the base of the combustion chamber.
Remove the baffles, see diagram 8.2.
Clean the heat exchanger flueways with a suitable stiff brush.Remove the paper together with any debris. 25
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