20. ANNUAL SERVICING
Check the appearance and airtightness of the gaskets of the gas and combustion circuits;
Check for any impurities inside the combustion chamber. Use a vacuum cleaner to do this;
Check the gas valve is correctly calibrated;
Check the pressure of the heating system;
Check the pressure of the expansion vessel;
Check for any impurities inside the siphon (for condensation boilers);
20.1 HYDRAULIC UNIT
KEY TO HYDRAULIC UNIT - "SECTION" G
A
B
Boiler/system drain tap
C
C-1
C-2
(
&
: access to tap C
D
E
DHW temperature NTC probe
F
20.1.1 CLEANING THE COLD WATER FILTER
Remove the nut on the DHW priority sensor unit
Remove any impurities.
20.2 POSITIONING THE ELECTRODES
20 °F
53
B
CG_2190
7219836.01 (1-04/15)