Immergas NIKE Mini 24 Export Manual page 17

Technical Documentation Technical Documentation
Safety devices and checks for S models (central
heating only).
Automatic system by-pass (3).
This device guarantees the circulation of water in the central
heating circuit even when it would be prevented by the high
6 2
resistance of the system.
It works between the central heating delivery and return,
inserted inside the by-pass fitting (4) that connects the pump
unit (2) to the delivery manifold.
System filling unit (7).
This is a valve positioned between the boiler circuit and the
7
domestic cold water inlet and makes it possible to pressurise
the heating system.
The filling up unit is connected to the cold water inlet coupling
(6) by means of a threaded fitting and to the pump unit (2)
by means of an O ring.
Automatic air vent (1).
1
It automatically expels any gaseous substances there might be
in the boiler circuit.
It is mounted on the circulator delivery, directly on the pump
unit (2).
2
3-bar safety valve (5).
This valve prevents the safety pressure being exceeded in the
primary circuit (3 bar).
3
5
It is fitted at the front of the pump unit (2) and fixed on the
outside with a fork.
When this valve triggers water exits from the boiler return
4
pipe.
Expansion vessel (8).
It compensates for variations in volume when the water is
heated and also limits pressure variations.
It has a 6-litre capacity (4.5 useful litres) for the 24 S model
and a preload pressure of 1.0 bar.
It is rectangular in shape and located on the right of the boiler,
by the side of the combustion chamber and connected to the
NIKE Mini 24 S
pump unit (2) with a copper pipe.
8
Note: NIKE Mini 24 S is a wall-hung boiler for central heat-
ing only but by using the optional kit consisting of a 3-way
electric valve and domestic hot water probe (together with the
necessary wiring), it can be combined with a separate storage
tank for producing domestic hot water.
STNM ed 07/07 NIKE Mini Export
15