33
Response 80 / 100 / 120
- Installation
47
SERVICING SCHEDULE
must be divided by 10,000 to convert it to a percentage.
If the ratio of CO/CO
2
is less than 0.004 and the gas
rates measured in steps 3 and 4 are close to nominal
then no further action need be taken. If not, proceed to
step 5.
5. Clean the main burner.
6. Clean the heat exchanger.
7. Check the main injector for blockage or damage.
8. Check that the flue terminal is unobstructed.
The servicing procedures are covered more fully in Frames
48 to 53 and MUST be carried out in sequence.
WARNING.
ALWAYS turn off the gas supply at the gas service cock, and
switch off and disconnect the electricity supply to the
appliance before servicing.
Switching the boiler on/off switch 'off' when a frost thermostat
is wired directly from the mains may leave a live feed to the
boiler.
ALWAYS test for gas soundness and carry out functional
checks on reassembly.
IMPORTANT. When work is complete the boiler inner front
sealing panel MUST be correctly refitted, making a good
seal.
DO NOT OPERATE THE BOILER IF THE SEALING
PANEL IS NOT FITTED.
48
BOILER SEALING PANEL REMOVAL
3. Remove the screws and pull out the tabs from the slots.
1. Turn off the gas supply at the gas service cock and
disconnect the electricity supply.
2. Remove the screw and lift off the boiler front panel.
SERVICING
SER
VICING
To ensure the continued safe and efficient operation of the
appliance it is recommended that it is checked at regular
intervals and serviced as necessary. The frequency of
servicing will depend upon the installation condition and usage
but should be carried out at least annually. It is the law that
any service work must be carried out by a registered CORGI
installer.
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 1 for CH
operation.
3. Fully open a hot water tap. The pump should stop as the
boiler switches to HW mode. When the boiler has settled
down check the gas rate, as in step 3, checking the
measured rate against the figures given in Table 1 for HW
operation.
4. Check the percentages of CO and CO
2
in the flue gases at
the sampling point provided. Refer to Frame 48.
Note.
If your meter reads CO in parts per million the figure
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