Closed Expansion Vessel Connection; Mounting Of Heat Discharge Valve (Not Supplied) - Extraflame TERMOPELLET TC30 Installer Manual

Chapter 4

CLOSED EXPANSION VESSEL CONNECTION

The appliance must be connected directly to the vessel of plant expansion vessels unit through a pipe with
internal diameter not lower than 18 mm.
Intercepting objects nor practical section decreases must be inserted on the connection piping, which can
be constituted by plant portions. The insertion of a three-way intercepting valve which allows connection
between the vessel and the atmosphere for maintenance operations, is allowed. Such device must be
protected against accidental manoeuvres. The connection pipe must be realised in order not to present
scales or deposits storage points.
In case of more heat generators which feed the same plant or the same secondary circuit, each heat
generator must be connected directly to the expansion vessel or plant expansion vessels unit, altogether
dimensioned for the total volume of water contained in the same plant or the same independent circuit.
Where it is necessary to separate the individual heat generator from the vessel or expansion vessels unit,
a three-way tap must be applied on the connection piping between the generator and the vessel, in
order to ensure, in every position, the connection of the generator with the expansion vessel or with the
atmosphere.

MOUNTING OF HEAT DISCHARGE VALVE (NOT SUPPLIED)

The solid fuel heat generators must be installed with safety devices determined by laws in force. For this
purpose, the boiler TC 30 is equipped with a safety exchanger.
The safety exchanger must be connected on one side to the water network (A) and the other to the drainage
network (C). The heat discharge valve (compulsorily supplied by the installer for closed vessel plant for
manual and automatic-manual feeding appliances), which bulb will be connected to attachment B, once
the safety temperature is reached enables the cold water to enter the copper coil contained in the boiler,
discharging the thermal excess through pipe C towards a conveniently installed discharge. The pressure
upstream from the cooling circuit must be at least 1.5 MPa (1.5 bar).
A
C
fi gure 4.1 fi gure 4.2
B
fi gure 4.3
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HYDRAULIC PLANT CONNECTION