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OVERVIEW OF SETTINGS
6.4 Boiler & Burner Servicing
In addition to the periodic inspections given on page 36 it
is recommended that a complete check is carried
out on all components at appropriate intervals.
service engineer, ideally under an annual sevice and
maintenance contract.
Hoval Service Department normally provides this service
and will be pleased to provide a written quotation on re-
quest. This would typically cover the operation, cleanli-
associated controls. In the case of gas burners it would
include a check on the gas tightness of the gas control
valves at the burner if a gas leak detection unit is not
could also be covered in this service.
Please note:
No adjustment of internal components is
permissible on either gas or oil burners
-
neer.
make a monthly leak test on these pipes.
6.4.1 Boiler Cleaning for Heating Surface
Frequency of cleaning will be dependent on usage in con-
junction with the condition of the boiler at the periodic
inspections, but the minimum requirements when using
the various fuels are:
Gas (natural or LPG) - once per heating seaon
Oil BS Class D (35 sec) - twice per heating season
Oil heavy grades - 3 to 4 times per heating season
1. Run the boiler until the burner automatically switches
off under action of the control thermostat. (It is easier
to clean a warm boiler).
2. Switch OFF electrical supply to the burner. Where a
to the burner, disconnect at this point. Switch OFF
electrical supply to the booster.
NOTE:
Where heavy oil is being used on a cir-
culatory fuel system, ensure that fuel
pump(s) heaters and tracers are left in
operation at all times.
3. Turn OFF all fuel shut-off valves at the burner.
4. Where rigid fuel pipes to burner are employed, e.g.
gas burners, disconnect pipe(s) to allow the boiler
door to open.
5. Fully open the boiler door complete with burner.
NOTE:
Lengthy periods between cleaning should
only be resorted to when the periodic inspec-
tions prove this is possible.
6. Clean the tubes using the supplied brush. Similarly
clean the combustion chamber when required. Avoid
damage to the ceramic sealing strip against which
the door closes.
NOTE:
Where any hard scaling is present, use a
propietary cleaning medium to soften and
assist removal.
7. Remove rear cleaning/explosion door. Clear loose
soot from the smoke outlet box and thoroughly clean
the box. Clean and examine the boiler backplate; no
hard deposit should be present. Remove any build
up occuring between the projecting tube ends.
8.
9. Check conditions of cleaning/explosion door gasket.
tighten the wing nuts only two full turns against spring
compression.
10. Check condition of boiler door ceramic seal. Ins-
-
al around burner tube. Minor damage to insulating
-
le refractory (e.g. Pyruma) on refractory lined doors.
suffer damage in normal use but in the unlikely event
please consult Hoval. Any serious damage must be
reported to the Service Engineer for repair. Filler
material can be repaired similarly. The door sealing
strip must be in good condition and must be replaced
when an effective seal cannot be obtained under nor-
mal pressure. Replace sealing strip annually. Refer
to Burner Maintenance Instructions Page 38 whilst
the door is open.
11. Close the boiler door, and evenly tighten the nuts
using a tommy bar/spanner.
12. If disconnected, plug in the boiler/burner electrical
connection.
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