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INSTALLATION INSTRUCTIONS:
HYDRAULIC CONNECTIONS
3. CENTRALISED SYSTEM REQUIREMENTS
Some general indications concerning the installation of the centralised heating system are shown below. For the-
se types of plants, a cutting-edge bespoke design compliant with current legislation is always necessary in order
to ensure ideal conditions of comfort, save energy and reduce the environmental impact.
Install the boilers in a cascade arrangement (preferably condensation boilers with low pollutant emissions) of a suitable
size to optimise plant performance according to seasonal loads, user demand and Domestic Hot Water demand peaks.
The maximum installed power must consider a simultaneous use factor so as not to oversize the generator and conse-
quently reduce operating ef ciency.
The centralised plant must service the various oors of the building by means of columns positioned in the stairwells or
in utility rooms which should preferably be inspectable.
A hydraulic separator should always be tted downline from the heat generator as this separates circulation in the gene-
rator from circulation in the columns.
The centralised plant must have the following features:
Each suitably sized column must be tted with a circulator (preferably at variable speed depending on the demand of the
modules), on/off valves and a dynamic balancing valve. Automatic air vents must be installed at the top of the columns.
The inlet sections must have the same pressure drop in order to allow the system to balance feed to all the user systems.
The recommended typology is three columns with a reverse return line.
Modules with Domestic Hot Water production require an appropriate centralised plant capacity so as to produce a thermal
mass that can limit the instantaneous operation of the generator (column oversizing).
THE COLUMNS AND MANIFOLDS MUST BE WELL LAGGED.
Make sure that the circuit pressure drops downline from the module (R = 0.3 KPa/m per linear metre + local leaks) are
compatible with the pump supplied together with the module. In this case, the column pump must offset the circuit pres-
sure drops upline from the module (a residue head is acceptable).
SIRIUS SAT user modules are tted with an automatic by-pass valve which opens the circulation circuit when the pressure
drops exceed 60 kPa (inlet valve closed).
INSTALLATION AND OPERATING MANUAL
912.807.1 - GB
5
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