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35
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3.7 CHECK THE NETWORK
PRESSURE (MINIMUM POWER
SUPPLY PRESSURE - ONLY WITH
APPLIANCES OPERATING WITH
METHANE).
- Disconnect power from the water heater
- remove the casing by loosening the fastening
screws situated in the lower part of the water
heater and release the casing from the upper
part
(Fig. 36)
;
- remove the cap that closes the service passage
(situated on the bracket -
Fig. 35
) and make it
pass through the hole of the silicone pipe of the
pressure gauge;
- loosen the pressure point screw upstream of the
gas valve (
Fig. 35
) by approximately two turns
and connect the pressure gauge;
- close the casing properly;
- turn the water temperature adjustment knob
to maximum;
- connect power to the water heater;
- open a hot water tap to the maximum flow rate.
Check the gas pressure by referring to the values
indicated in the data table. If the pressure is above
15 mbar, proceed with calibrating the gas valve.
When measuring, a tolerance of +/- 0.5 mbar
is permitted.
- Close the hot water cock;
- disconnect the pressure gauge and secure the
pressure point screw upstream of the gas valve
again;
- if there are seals, they must be restored.
3.8 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 burner calibration.
- Check correct operation of control and
adjustment devices of the appliance. and in
particular:
- the intervention of the functioning selector
positioned on the water heater control panel;
- domestic hot water control thermostat inter-
vention.
- Check that the internal system is properly
sealed according to the specifications set forth
by technical regulations in force.
- Check the intervention of the device against no
gas ionisation flame control. Intervention time
must be less than 10 seconds.
- Check for water leaks or oxidation from/on the
fittings.
- Visually check that the safety and control
devices have not been tampered with and/or
shorted, in particular:
- temperature safety thermostat;
- Check the condition and integrity of the elec-
trical system and in particular:
- the power cables must be inside the cable
fixings;
- there must be no traces of blackening or
burning.
3.6 SOLAR PANELS COUPLING
FUNCTION.
All Immergas models are supplied as standard
with the NTC probe applied to the DHW cold
water inlet pipe. The probe can be activated by
setting the parameter “P28”.
When parameter "P28" is equal to zero the
probe is disabled; when instead the parameter
is assigned a value between 1 and 20, the probe
is enabled and the function is activated with a
delay that can be set between 1 and 20 seconds.
The water heater is set up to receive pre-heated
water from a system of solar panels up to a max-
imum temperature of 65°C.
Attention:
the manufacturer denies any liabil-
ity for damage to persons or things caused by
exceeding this temperature.
In any case, it is always necessary to install a mix-
ing valve on the hydraulic circuit upstream of the
boiler, on the cold water inlet. Set the temperature
on the mixing valve increased by 5°C with respect
to that set on the water heater, so as to ensure that
the temperature at the water heater inlet does not
exceed the maximum value indicated.
If the temperature detected on the inlet probe
is lower than that set by the user with the knob,
the water heater switches on and goes into mod-
ulation until the desired temperature is reached.
On the other hand, if the temperature detected
on the inlet probe is close to or equal to that set
by the user, the water heater does not switch on.
Key:
1 - Pressure point downstream of the valve
2 - Pressure point upstream of the valve
3 - Service passage
