Servicing & Routine Maintenance - Potterton Combi 80 Installation & Service Instructions Manual

4. Servicing & Routine Maintenance - Page 21
•
To ensure the continued safe and efficient operation of
the appliance it is recommended that it is checked and
serviced as necessary at regular intervals.
The frequency of servicing will depend upon the
particular installation conditions and usage but in
general, once per year should be adequate. It is the law
that all servicing work is carried out by competent
persons such as CORGI registered personnel.
•
WARNING: Before the start of any maintenance work,
disconnect the mains electricity supply to the appliance
by removing the plug from the socket or by switching off
at the external isolating switch. The gas distribution
pipework and all associated appliances (including the
boiler) must be checked for gas soundness. The
appliance gas supply should be isolated at the gas
service cock, (one quarter turn of square spindle) if
dismantling gas carrying components.
•
The following notes apply to the appliance but it should
be remembered that attention must also be paid to the
heating and hot water systems in the property with
special attention to radiator valves, thermostats, clocks,
leaking hot water taps etc.
Where it is necessary to replace a gasket that relies on
adhesive for securing - this adhesive will be supplied
with the gasket in the spares kit.
Prior to servicing, Remove the white front case (see
Section 4.1 on Page 22). Operate the appliance by
turning On a hot water tap to a high water flow and
observe the main burner.
Look through the sight glass and check that the flame
covers all the flame ports and is of a light blue colour.
Yellow flames and excessive lifting of flames indicate
poor combustion.
•
It is preferable to measure the CO% and CO2% content
of the flue products. This is achieved by placing a
suitable sampling probe into the fluehood via the sample
test point on the air box door.
Typical figures based on a 500mm flue length with the
boiler operating at maximum output are:-
CO 0.002 - 0.005%
CO 4.5 - 5.0 %
2
•
IMPORTANT: After completing any servicing or
replacement of a gas carrying component, it is essential
that a test for gas soundness is made and functional
checks of controls operation carried out.