Immergas 3.020857, Instruction Booklet And Warning

Page: 21 / 28

21
INS
TALL
AT
O
R
US
ER
MAINTEN
AN
CE TECHNI
CI
AN
3.17 YEARLY APPLIANCE CHECK AND
MAINTENANCE.
The following checks and maintenance should
be performed at least once a year.
- Clean the flue side of the heat exchanger.
- Clean the main burner.
- Visually check the flue hood for deterioration
or corrosion.
- Check correct lighting and functioning.
- Check correct calibration of the burner in do-
mestic hot water (when the boiler is connected
to an external cylinder) and central heating
phases.
- Check correct functioning of control and
adjustment devices and in particular:
- the intervention of main electrical switch
positioned outside of the boiler;
- system control thermostat intervention;
- domestic hot water control thermostat inter-
vention
(when the boiler is connected to an
external cylinder) .
- Check sealing efficiency of the gas circuit and
the internal system.
- Check the intervention of the device against no
gas ionisation flame control. Intervention time
must be less than 10 seconds.
- Visually check for water leaks or oxidation
from/on connections.
- Visually check that the water safety drain valve
is not blocked.
- Check that, after discharging system pressure
and bringing it to zero (read on boiler mano-
meter), the expansion vessel load is at 1.0 bar.
- Check that the system static pressure (with
system cold and after refilling the system by
means of the filling valve) is between 1 and
1.2 bar.
- Visually check that the safety and control
devices have not been tampered with and/or
shorted, in particular:
- check the integrity of the storage tank’s Ma-
gnesium Anode ( when the boiler is connected
to an external storage tank unit
).
- temperature safety thermostat;
- water pressure switch,
- flue exhaust control thermostat.
- Check the condition and integrity of the elec-
trical system and in particular:
- electrical power cables must be inside the
whipping;
- there must be no traces of blackening or
burning.
NOTE: in addition to yearly maintenance, you
must also check the thermal system and thermal
efficiency, with the frequency and procedures
that comply with the technical regulations in
force.