Hydraulic Installation; Safety Valves; Closed Expansion Vessel - BOREAL HYDROBOREAL Série Instructions D'installation, D'utilisation Et D'entretien

SOLID FUEL NATURAL VENTILATION
EN
SOLID FUEL FORCED VENTILATION

7. HYDRAULIC INSTALLATION

Boreal's Hydroboreal boilers have been designed for installation with a closed expansion vessel, where the water contained does not communicate
direct or indirectly with the atmosphere. In general, the installation of closed expansion vessel is provided with a pre-charged closed vessel with a gas-
tight membrane.

SAFETY VALVES

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The boiler is provided with a safety valve set at 3 bars pressure, in order to work during possible increases of pressure on the installation.
The discharge flow rate of the safety valve must allow to discharge an amount of vapour not lower than Q / 0.58 [kg. h], where Q is the useful power
transferred to the water of the generator expressed in kilowatts.
The fitter must control the maximum pressure in each point of the installation so that it does not pass the maximum working pressure of each component.
The safety valve is placed on the top of the boiler, next to the exit tube. The discharge tube of the safety valve must be made so that it allows the normal
operation and does not cause damages to people; the discharge must end near to the safety valve and be visible and accessible.

CLOSED EXPANSION VESSEL

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The boiler is provided with a 6 l. closed expansion vessel, pre-charged at 1.5 bars.
The maximum working pressure of the vessel is lower than the calibrated pressure of the safety valve. The fitter must anticipate the capacity of the
expansion vessel by analysing the total capacity of the installation and placing another additional vessel if necessary.
The closed expansion vessels must conform to the provisions in terms of design, fabrication, conformity assessment and use for pressure equipments.
In case of multiple heating generators (boilers that use other fuels or wood-burning thermo-fireplaces) that work in the same installation or the same
secondary circuit, it is compulsory to connect each generator with an expansion vessel, completely scaled for the total volume of water contained in the
same installation and in the same independent circuit.
CONTROLS DURING THE FIRST START-UP
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Before the connection of the boiler make:
a. A careful cleaning of all installation pipes to remove any residues that may damage the operation of some components of the installation (pumps,
valves, etc.)
b. A control to check the correct draught of the smoke exit, the absence of strangulations and make sure that there are not discharges from other
equipments in the smoke exit duct.
c. The correct purged of the installation.
INSTALLATION, OPERATING AND SERVICING INSTRUCTIONS
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