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INSTALLATION AND OPERATING MANUAL
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 consequently
reduce operating efficiency.
The centralised plant must service the various floors 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 fitted 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:
• Automatic filling
• Expansion system sized according to total plant capacity
• Overpressure safety valve sized according to current legislation
Each suitably sized column must be fitted 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.
The heating circuit pressure drops downline from the user module (R = 0.3 KPa/m per linear metre + local pressure drops)
and the pressure drop of the module itself must also be considered when calculating the pressure drops.
The
LUNA SAT
user models are fitted with an adjustable and closable by-pass valve which opens the recirculation circuit
when the unit does not require heat.
3. CENTRALISED SYSTEM REQUIREMENTS
INSTALLATION INSTRUCTIONS:
HYDRAULIC CONNECTIONS
