Immergas ZEUS 24 - Page 22

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INSTALLATORUSERMAINTENANCE
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3.10 PUMP ANTIBLOCK FUNCTION.
If the main selector is set on “domestic water”
( ) the boiler has a function that makes the
pump start at least once every 24 hours for 2.5
minutes in order to reduce the risk of the pump
blocking due to extended inactivity.
If the main selector is set on “domestic water
-heating”( ) the boiler has a function that
makes the pump start at least once every 3 hours
for 2.5 minutes.
3.11 THREEWAY ANTIBLOCK SYSTEM.
Both in “domestic” and in “domestic-heating”
phase the boiler is equipped with a function that
starts the three-way motorized group 24 hours
aer it was last in operation, running it for a full
cycle so as to reduce the risk of the three-way group
becoming blocked due to prolonged inactivity.
3.12 RADIATOR ANTIFREEZE
FUNCTION.
If the system return water is below 4°C, the boiler
starts up until reaching 42°C.
3.13 ELECTRONIC CARD PERIODICAL
SELFCHECK.
During operation in heating mode or with boiler
in standby, the function activates every 18 hours
aer the last boiler check/power supply. In case
of operation in domestic circuit mode the self-
check starts within 10 minutes aer the end of
the drawing in progress, for a length of approx.
10 seconds.
N.B.: During self-check, the boiler remains o,
including signalling.
3.14 CASING REMOVAL.
To facilitate boiler maintenance the casing can be
completely removed as follows (Fig. 3-5):
- Disassemble the lower cover by removing the
two relevant screws (1).
- Unscrew the two screw fasteners on the
dashboard and open it making it pivot.
- Unscrew the 2 xing screws (2) on the casing.
- Unhook the lower part of the casing as
described in the gure.
- Pull the casing (4) forwards and up at the same
time (see gure) to detachit from the upper
hooks.
3.15 YEARLY APPLIANCE CHECK AND
MAINTENANCE.
e following checks and maintenance should
be performed at least once a year.
- Clean the ue side of the heat exchanger.
- Clean the main burner.
- Visually check the fume hood for deterioration
or corrosion.
- Check correct lighting and operation.
- Ensure correct calibration of the burner in
domestic water and heating phases.
- Check correct operation of control and
adjustment devices and in particular:
- intervention of electrical main electrical
switch on boiler;
- system control thermostat intervention;
- domestic water control thermostat
intervention.
- Check that the internal system is properly
sealed according to specications.
- Check intervention of the device against no
gas ionization ame control: intervention time
must be less than10 seconds.
- Visually check for water leaks or oxidation
from/on connections.
- Visually check that the water safety drain valve
is not blocked.
- Check that, aer discharging system pressure
and bringing it to zero (read on boiler pressure
gauge), the expansion tank charge is at 1.0 bar.
- Check that the system static pressure (with
system cold and aer relling the system by
means of the ller cock) is between 1 and 1.2
bar.
- Check visually that the safety and control
devices have not been tampered with and/or
shorted, in particular:
- temperature safety thermostat;
- system pressure switch;
- fumes pressure switch.
- Check integrity of the boiler Magnesium anode.
- Check the condition and integrity of the
electrical system and in particular:
- electrical power cables must be inside the
whipping;
- there must be no traces of blackening or
burning.