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SERVICING
34
mini HE --- Installation & Servicing
41 SERVICING SCHEDULE
To ensure the continued safe and efficient operation of the
appliance it is recommended that it is checked at r egular
intervals and serviced as necessary.
The frequency of servicing will depend upon the installation
condition and usage but sho uld be carried out at least
annually.
It is the law that any servic e work must be carried out by a
registered CORGI installer.
In IE, servicing work must be carried out by a competent
person.
1 Turn the heating controls to maximum so that the boiler
lights and remains running. Check that no other gas
appliances in the house are in use or likely to be used.
2 When the boiler has settled down check the gas rate at
the meter (if the meter is of the pointer type you should
time only complete revolutions of the pointer). Check the
gas rate against the figures given in Table 2 for CH
operation.
3 For a combination boiler, fully open a hot water tap. When
the boiler has settled down check the gas rate, as in step
2,checkingthemeasuredrateagainstthefiguresgivenin
Table 3 for HW operation.
4 Run the boiler and check the percentage of CO and CO2
in the flue gasses at the sampling point indicated in the
following drawing.
Sampling points
Exhaust gas
Sampling points
Air intake
Note. If your meter reads CO in parts per million the figure
must be divided by 10,000 to convert it to a percentage.
5 IftheratioofCO/CO
2
is less than ,004 and the gas rates
measured in steps 3 and 4 are clo se to nominal then no
further action need be taken. If not, proceed to step 6.
6 Clean the main burner.
7 Clean the heat exchanger.
8 Check the injectors for blockage or damage.
9 Check that the flue terminal is unobstructed.
10 Check and clean the condensate trap and drain (see
frame 73).
The servicing procedures are covered more fully in Frames 42
to 47 and MUST be carried out in sequence.
WARNING.
ALWAY S turn off the gas supply at the gas service cock, and
switch off and disconnect the electricity supply to the
appliancebeforeservicing.
Switching the boiler on/off switch ‘off’ does not fully
isolate the boiler.
ALWAYS test for gas tightness and carry out functional
checks on reassembly.
IMPORTANT. When work is complete the bo iler inner front
sealing panel MUST be correctly refitted, making a good seal.
DO NOT OPERATE THE BOILER IF THE SEALlNG PANEL
IS NOT FITTED.
Comp lete the service section in the Benchmark
Commissioning Checklist.
SERVICING