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STZM@ ed 05/04 ZEUS Maior @
Technical Documentation
Technical Documentation
Safety devices and controls.
Adjustable system by-pass (2).
is device ensures circulation of water in the primary circuit
(between delivery and return) even when this is prevented by
the system’s high resistance.
It is mounted on the delivery manifold unit (1) and can be
adjusted by a screw, accessible from the bottom of the valve
supporting plate.
System filling device (3).
It is a ball cock mounted between the boiler circuit and the
inlet of the domestic cold water and permits pressurisation of
the central heating system.
e cock is connected to a fill-up fitting (4) which, in turn, is
connected to the motorised 3-way diverter valve unit.
System pressure switch (5).
It reads the pressure inside the primary circuit.
It is housed in the delivery manifold unit (1) and coupled to a
microswitch that prevents the burner working when pressure
is below 0.3 bar.
It prevents the main exchanger from overheating.
Automatic air vent (6).
It automatically expels any gaseous substances from the boiler
circuit.
It is mounted on the pump’s delivery side directly on the
hydraulic unit.
3-bar safety valve (7).
is valve prevents the safety pressure (3 bar) being exceeded
in the primary circuit.
It is coupled to the front of the delivery manifold unit (1) and
fixed on the outside by a fork.
When this valve triggers water exits from the delivery pipe.
System expansion tank (8).
It compensates for variations in volume as a result of heating
the water which also limits pressure variations.
It has a useful capacity of 5.9 litres (ZEUS 21 version) and 7.1
litres (ZEUS 24 version) and a pre-load pressure of 1.0 bar.
It is located at the front of the storage tank in front of the
boiler.
8
System
delivery
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