Automatic Slow Ignition Function With Timed Ramp Delivery; Solar Function; Solar Panels Coupling Function; Yearly Appliance Check And Maintenance - Immergas Caesar 14 4 ERP Instruction And Recomendation Booklet

3.8 AUTOMATIC SLOW IGNITION
FUNCTION WITH TIMED RAMP
DELIVERY.
In the ignition phase, the burner ignites at the
"ignition power value" set (P3), after which, on
the basis of the DHW withdrawal it carries out
a gas supply increasing ramp (with pressure
values that depend on the type of gas selected)
with a pre-defined duration. This prevents every
calibration or precision adjustment of the water
heater ignition phase in any conditions of use.

3.9 SOLAR FUNCTION.

The solar function is always active.
During a request for DHW, if the inlet tem-
perature is the same as or higher than -3°C with
respect to the value set, the water heater does
not switch-on.
Functioning is however shown on the display by
the flashing of the relevant signal (4).
3.10 SOLAR PANELS COUPLING
FUNCTION.
The water heater is set-up to receive pre-heated
water from a system of solar panels up to a
maximum temperature of 65°C. In all cases, it is
always necessary to install a mixing vale on the
hydraulic circuit upstream from the water heater
on the cold water inlet.
Note: to ensure the water heater operates cor-
rectly; the temperature selected on the mixing
valve must be 5 °C greater with respect to the
temperature selected on the water heater con-
trol panel.
In this condition, parameter P1 (solar delay
timing) must be set at a temperature sufficient
to receive water from a storage tank situated
upstream from the water heater. The greater the
distance from the storage tank, the longer the
stand-by time to be set. When these regulations
have been performed, when the water heater inlet
water is at the same or greater temperature with
respect to that set by the DHW selector switch,
the water heater does not switch on.
3.11 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 ignition and operation.
- Check correct burner calibration.
- Check the operation of the appliance control
and adjustment devices 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 technical regulations in
force;
- 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 safety and control
devices have not been tampered with and/or
shorted, in particular:
- temperature safety thermostat;
- 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.
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