E.C.A. Fortius Service Manual page 20

PRESSURE RELIEF VALVE (3 BAR)
7
Pressure relief valve (3 bar) protects the central heating circuit and the appliance against increasing
pressure. When the pressure in the central heating circuit is over 3 bars, the relief valve functions
and decreases the pressure (the outlet tap of the 3 bar relief valve should be connected to the drain
line with a plastic hose). The pressure relief valve is on the hydroblock, on the central heating
return.
Table 9 Pressure relief valve
Hydroblock connection
Water discharge pipe connection
DISCHARGE TAP
8
The discharge tap is used for removing the water in the central heating circuit. It is on the outlet
manifold in bithermic types while it is on the inlet manifold in monothermic types.
Table 10 Discharge Tap
Hydroblock connection
FILLING TAP
9
The filling tap is for filling the central heating circuit using the domestic water line. It is integrated
on the inlet manifold of the hydroblock.
WATER PRESSURE SWITCH
10
Water pressure switch prevents the operation of the appliance in low water pressure. If the water
pressure in the central heating circuit is below 0.8 bar, the water pressure switch goes OFF and the
signal sent from the water pressure switch to the main board prevents the boiler operation. When
the pressure is above 1 bar, the boiler goes back to normal operation. The water pressure switch is
on the outlet manifold of the hydroblock, on the central heating flow.
The electric circuit connection of the water pressure switch is COM and CO terminals (NC not
connected).
TABLE 11 Water Pressure Switch
Hydroblock connection
fig. 8 Pressure Relief Valve
Rapid connection (O-ring)
G ½"
G ¼" (External thread)
G ¼" (External thread)
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