Description of functioning
technical
6
Filling the heating circuit:
In order for the boiler to function correctly, the heating circuit pressure must be at
around 1.6Bar when it is cold.
Both the boiler and the heating installation must be correctly purged, as air in the
water pipes can cause excessive noise and malfunctioning.
The boiler has a pressure relief valve incorporated to the pump body.
The radiators and upper areas of the heating circuit should be provided with an auto-
matic air vents. The procedure for correct filling of the installation is as follows:
- Fill the heating circuit by introducing a sufficient antifreeze/inhibitor solution via the
double check valve on the filling loop assembly.
When the pressure gauge shows that a pressure of 1.6bar has been reached.
Vent radiators and recheck pressure.
- Ensure there is no leakage from the installation or boiler. Check all the con-
nections thoroughly.
Domestic Hot Water Functioning (DHW):
Water begins to circulate through the domestic circuit of the boiler. The cold water
flows through the 3-way valve, this action ports the 3 way valve and micro switch into
DHW mode.
Water heated in the primary circuit flows through the plate heat exchanger to heat up
the water coming from cold mains water supply. As the cold water circulates, it is
heated up in the plate heat exchanger.
The temperature of the DHW is controled by the central heating return
thermistor and the temperature selected by the user and limited for safety.
Heating Functioning:
The pump starts up and water begins to circulate through the radiator circuit. The fan
and the burner then start up. The heating output temperature is controlled at all times by
both thermistors.
Draining the heating circuit:
The boiler has a drain valve incorporated for drai-
ning the heating circuit when necessary.The safety
valve mustn’t be used for this purpose.
