29
British Gas 4100 & 4125 RD2 -
Installation & Servicing
SERVICING
46 SCHEDULE
WARNING.
BEFORE SERVICING always turn OFF the gas supply at the
gas service cock and switch OFF and DISCONNECT the
electrical supply to the appliance.
British Gas services recommend that appliances are regularly
serviced at 12 month intervals. However, where an applience is
being constantly monitored, as is the case with an RD
technology boiler, the interval can be extended to 24 months
without detriment to performance or reliability.
It is the law that any service work must be carried out by a
CORGI registered instatller.
a. Light the boiler and carry out a pre-service check, noting any
operational faults.
b. Operate the boiler for at least 20 minutes. Check the gas
consumption.
c. Connect a suitable gas analyser to the sampling point on the
flue collector. Refer to Frame 50.
For correct operation the CO/CO
2
content of the flue gas
should not be greater than 0.004 ratio. If this is the case and
the gas input is within 95% of the nominal then no further
action need be taken. If not the case, proceed to step (d)
d. Clean the main burner. Refer to Frame 49.
e. Clean the heat exchanger. Refer to Frame 50.
f.
Clean the main injectors. Refer to Frame 49.
g. Check that the flue terminal is unobstructed and that the
flue system is sealed correctly.
h. If the appliance has been installed in a compartment, check
that the ventilation areas are clear.
The servicing procedures are covered more fully in Frames
47 to 52 and MUST be carried out in sequence.
Note.
In order to carry out either servicing or replacement of
some components, the boiler casing must removed. Refer
to Frame 47.
IMPORTANT. After completing the servicing or exchange of
components always test for gas soundness and carry out
functional checks as appropriate.
When the work is complete the casing MUST be correctly
refitted and secured.
The boiler must NOT be operated if the casing is not fitted.
47 BOILER CASING REMOVAL
1. Remove the 2 screws and lift off the lower front panel.
2. Remove the 2 screws and lift off the grille assembly.
3. Disconnect the electrical leads from the gas valve.
4. Release the 'Burner On' neon from the lens holder at
the rear of the control panel.
5. Disconnect the thermostat from the control panel:
a. Pull off the thermostat knob.
b. Undo the 2 securing screws and withdraw the
thermostat from the panel.
6. Remove the 2 screws securing the control panel and
pull down to release the tabs from under the top panel.
7. If the boiler is not fitted under a work top, access for
flue cleaning will be improved by removing the top
panel:
a. Remove the 2 securing screws.
b. Pull the panel forward and lift off.
SER
VICING
