12
Figure 19
Figure 20
Figure 21
NON-RETURN VALVE, AUTOMATIC AIR VENT VALVE, SAFETY VALVE AND WATER
PRESSURE SENSOR
They can be reached by removing the right side, if you are facing the front side of the boiler . It is not shown in a figure, but
the boiler is shown where the right side is shown in the foreground (Figure 22). All these elements are built in the boiler at the
factory.
7.4.5.1 NON-RETURN VALVE
Non-return valve R5 /4" is installed on the boiler 's pressure line in the factory (Figure 23).
It does not allow cold water to return from the system when the pump is stopped, which prevents condensation of the
boiler .
If there are more than one pump in the installation system, it is necessary to install more non-return valves. A non-
return valve is placed behind each pump.
Make sure that the non-return valve is easy to open (use your finger) so that the pump force can open it.
The non-return valve prevents water in the boiler from cooling and thus prevents creating condensation in the boiler
and smoke pipes. Condensation can occur until 2 - 3 fuel tanks have been used.
Condensation in the boiler when the boiler is started for the first time is normal.
7.4.5.2 AUTOMATIC AIR VENT VALVE
Automatic air vent valve is positioned on the pressure line, under the lid at the highest point of the boiler .
Its purpose is to exhaust air from the boiler .
To get to the valve, you must take the right side off (when facing the boiler ).
Valve safety cap should be loose, not too tight, so that the air could freely leave.
7.4.5.3 SAFETY VALVE
The safety valve is with R1 / 2 "connector, with an outlet on the back side, above the non-return valve.
The safety valve is positioned under the furnace lid on the pressure line. Inlet connector is R1/2". Valve opens at water
pressure of 2.5 bars.
To get to the valve, you must take the right lateral side off (when facing the boiler ).
The safety valve outlet whose white alpex pipe Ø16mm is above the pressure line must be discharged into the sewer.
7.4.5.4 WATER PRESSURE SENSOR
The water pressure sensor does not allow the boiler to operate at low and high pressures. It is factory set to a minimum
operating pressure of 0.2 bar and a maximum of 2 bar.
If the pressure drops below 0.2 bar or increases over 2 bar, the boiler is switched off.
When facing the boiler , you can get to it by removing the right side.
Figure 22
Figure 23
Figure 24
MECHANICAL SAFEY DEVICES – THERMOSTATS
In addition to other safety devices, the boiler is protected against overheating with two mechanical thermostats. Their
outlets with black protective caps are shown in Figure 24.
The upper thermostat ensures that the boiler does not get overheated.
The lower thermostat ensures that screw feeder does not get overheated.
If the temperatures to which the thermostats are set up are reached, the boiler switches off.
It is necessary to wait for the boiler to cool down and then reset the thermostat that got activated.
