Technical documentation
Technical documentation
STZS ed 06/03
7
ZEUS SUPERIOR
- SAFETY DEVICES AND CONTROLS
System by-pass
(6)
This ensures water circulation in the primary circuit
(
between flow and return
) even when this is prevented
by the high resistance of the system.
It is mounted on the delivery manifold and can be
adjusted by means of a screw accessible from the
bottom part of the valve plate.
System filling valve
(5)
This valve is installed between the boiler circuit and the
domestic circuit cold water inlet is used to pressurize the
heating system.
Downstream of the cock, an one way valve is fitted
(nr 2
of hydraulic circuit)
that prevents accidental flow of
water from the primary circuit to the water network
(d.h.w. circuit).
Its seat is located in the lower part of the monobloc where
it is screwed on.
Pump pressure meter
(2)
This detects the difference in pressure at pump
extremities.
Its housing is in the delivery manifold and is coupled to
a micro-switch (3) that prevents burner operation in the
event of pump blockage or no water in the boiler circuit.
Prevents primary exchanger overheating.
3-bar safety valve
(4)
Prevents safety pressure (3 bar) being exceeded in the
circuit
.
On the versions 21 and 24 is fitted to the rear part of the
delivery manifold group, while on the version 27 is
fastened in its front part by means of a socket head screw.
When this trips, water exits from the flow pipe.
Automatic air vent
(7)
Automatically expels any gaseous substances in the
boiler circuit.
On the versions 21 and 24 , the valve is screwed on the water
side of the expansion vessel.
On the version 27 is mounted on the pump body.
Expansion vessel (
8)
Compensates changes in volume following heating of water
and permits reducing pressure changes.
It has a pre-load pressure of 0.8 bar and a capacity of 8 l
on the versions 21-24 and 10 l on the version 27.
It is located in front of the storage tank .
21 and 24 versions
27 version
21-24versions
27 version
