O Potterson CF 20/35, Installation And Servicing Instrucnions, Page: 32 / 43

SERVICING INSTRUCTIONS - Page 19
To ensure continued safe and efficient operation of the boiler, it is necessary t
o carry out servicing and cleaning at regular intervals. The frequency of cleani
ng will dependupon the particular installation conditions, and the use to which
the boiler is put, but in general, once per year should be adequate.
Servicing is best arranged by a contract placed with Potterton International Li
mited and further details are available from the local Potterton Regional Servic
e Office.
The boiler DATA PLATE and WIRING DIAGRAM are attached to the inside of
the casing bottom panel. The boiler CODE NUMBER which should be quoted
when orderingspares or requesting information is on the front of the control pa
nel below the boiler thermostat knob.
The following notes apply to the boiler and its controls but it should be remem
bered that attention must also be paid to the heating circuit itself including radi
ator valves,thermostats, the time control and the expansion and feed water sy
stem. It is advisable to clean the boiler immediately after the end of the heatin
g season.
In all cases prior to servicing, light up the boiler and check that the pilot and m
ain burners have a clean, even flame and that the gas rate and main burner pr
essure is correctlyset.
Before the start of any servicing work, switch off at the external electricity sup
ply by disconnecting the plug at the socket or switching off external isolating s
witch. Turn off thegas service cock.
NOTE:
After completing any servicing or replacement of components check for gas s
oundness and carry out functional checks.
1. PREPARING THE BOILER FOR SERVICING
A
Expose the lower case securing nuts by lowering the door in the front of casin
g. Remove the two securing nuts. See
FIG. 18. Remove case by lifting it from
the locating lugsat the top of the boiler.
B Remove the 5 nuts securing the combustion chamber front panel and remov
e panel. See
FIG. 19 . Inspect the rope seal on the front panel and replace if d
amaged.
2. MAIN BURNER ASSEMBLY - REMOVAL AND CLEANING