Immergas 3.020928, Instruction And Recommendation Booklet

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INS
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US
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MAINTEN
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3.10''CHIMNEY SWEEP'' FUNCTION.
When activated, this function forces the boiler
to variable output for 15 minutes.
In this state all adjustments are excluded and only
the safety thermostat and the limit thermostat
remain active. To activate the chimney sweep
function, press the “Reset” button (5) event for
activation in the absence of DHW requests.
Its activation is signalled by the indication of the
flow temperature on the indicator (17), the power
percentage on the indicator (21) and activation
of the relative symbol
.
This function allows the technician to check the
combustion parameters.
Once the function is activated, it is possible to
select whether to perform the check in CH status
or in DHW status by opening any domestic hot
water tap (when the boiler is connected to an exter-
nal storage tank unit) and regulating the power by
turning the "CH regulation" selector (1).
Functioning in CH or DHW mode is visualised
by the relative flashing symbols
or .
On completion of the checks, deactivate the
function by pressing the Reset button (5) for
8 seconds.
3.11 PUMP ANTI-BLOCK FUNCTION.
The boiler has a function that starts the pump
once every 24 hours for the duration of 30
seconds in order to reduce the risk of the pump
becoming blocked due to prolonged inactivity.
3.12 THREE-WAY ANTI-BLOCK
FUNCTION.
The boiler is supplied with a function that ac-
tivates the motorised three-way unit every 24
hours, carrying out a complete cycle in order
to reduce the risk of three-way block due to
prolonged inactivity.
3.13 RADIATOR ANTIFREEZE
FUNCTION.
If the system return water is below 4°C, the boiler
starts up until reaching 42°C.
3.14 P.C.B. PERIODICAL SELF-CHECK.
During functioning in central heating mode or
with boiler in standby, the function activates
every 18 hours after the last boiler check/power
supply. In case of functioning in domestic hot
water mode the self-check starts within 10 min-
utes after the end of the withdrawing in progress,
for duration of approx. 10 seconds.
N.B.:
during self-check, the boiler remains off,
including signalling.
3.15 SOLAR PANELS COUPLING
FUNCTION.
In the event of integration of DHW heating with
solar panel systems, for correct use of the boiler
in this condition, it is necessary to set parameter
P0 (DHW thermostat) on "1" (Hysteresis 2).
3.16 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 ignition and operation.
- Check the correct calibration of the burner in
the DHW phase (when the boiler is connected
to an external cylinder unit) and central heating
phase.
- Check the operation of the appliance control
and adjustment devices and in particular:
- intervention of main electrical switch posi-
tioned outside of the boiler;
- system control thermostat intervention;
- the intervention of the DHW adjustment
thermostat
(when the boiler is connected to
an external storage tank unit) .
- 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 clogged.
- Check, after discharging the system pressure
and bringing it to zero (read on boiler pressure
gauge), that the expansion vessel charge is at 1.0
bar.
- Check that the system static pressure (with sys-
tem cold and after refilling the system by means
of the filling cock) 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:
- temperature safety thermostat;
- water pressure switch,
- air pressure switch
- Check the condition and integrity of the electri-
cal system and in particular:
- supply voltage cables must be inside the
fairleads;
- there must be no traces of blackening or
burning.
N.B.: in addition to yearly maintenance, one
must also check the thermal system, with fre-
quency and procedures that comply with the
indications of the technical regulations in force.