Immergas HERCULES Condensing 26 2 E Manual page 13

Technical Documentation Technical Documentation
Safety devices and controls.
System filling (3).
It is a ball valve positioned between the boiler circuit and the
6 5
domestic cold water inlet that allows to pressurise the CH
system.
The valve is connected to the domestic cold water inlet unit
(4).
System pressure switch (5).
Detects the pressure inside the primary circuit.
Its seat is on the flow pump body directly on the hydraulic unit
and is coupled to a micro switch that prevents functioning of
the burner when the pressure detected is below 0.3 bar.
Prevents overheating of the main heat exchanger.
Automatic air vent valve (6).
Allows the automatic expulsion of the gaseous substances that
may be present in the boiler circuit.
It is mounted on the pump flow directly on the hydraulic
4
unit.
3 bar safety valve (7).
Prevents the safety pressure in the primary circuit from being
exceeded (3 bar).
It is situated in the right side of the boiler and is visible by
opening the right lateral door. It is positioned on the hydraulic
3
unit connection pipe - filling valve.
System expansion vessel (8).
It compensates the volume variation consequent to heating
the water, thus limiting the pressure variations.
It has a capacity of 12 litres and a factory-set pressure of 1.0
7
bar.
It is organised at the rear of the upper right zone of the ap-
pliance.
8
STHCkW ed 04/09 HERCULES Condensing Export
11