Safety And Control Devices - Immergas ZEUS kW Export Technical Documentation Manual

Technical Documentation

Safety and control devices.

Adjustable system by-pass (2).
The adjustable system by-pass guarantees water circulation in
the primary circuit (between flow and return) even when high
resistance in the system would not allow circulation.
By-pass is assembled on the flow manifold group (1) and can be
adjusted by acting on a screw to be accessed from underneath
the valve support plate.
System filling valve group (3).
The system filling valve group consists in a ball valve located
between the boiler circuit and the cold domestic water inlet,
which allows the central heating system to be pressurized.
The cock is connected to a filling fitting (4) which is connected
to the 3-way valve group.
Automatic vent valve (6).
The vent valve automatically expels any gaseous substances
from the boiler circuit.
The valve is located on the pump flow pipe directly on the
hy draulic group.
3-bar safety valve (5).
The safety valve ensures 3-bar safety pressure not to be ex-
ceeded.
It is inserted on the front of the flow manifold group (1) and
it is secured by a clip.
When triggered, the safety valve releases water from the flow
pipe.
System expansion vessel (7).
The expansion vessel compensates the variations in volume
caused when water is heated, and therefore it changes in
pressure.
The vessel has a 10-litre capacity (7.7 liter useful capacity) and
a 1.0 bar factory set pressure.
It is located above the storage tank and is connected to the
3-way valve group by a copper pipe.
STZkW ed 10/07
Technical Documentation
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System flow
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ZEUS kW Export