Ferroli OPERA Instructions D'utilisation, D'installation Et D'entretien page 139

OPERA
Before installation, flush all the pipes of the system thoroughly to remove
B
any residuals or impurities that could affect proper operation of the unit. Use
chemical conditioners suitable for the purpose; i.e. able to remove from the walls
and bottom of the pipes and the various components of the system, sludge, metal
oxides and, in low temperature systems, also biomass, with just the circulation of
the water, with system hot and/or cold. The products used must not be corrosive
and/or aggressive for metals and plastics and must not significantly alter the natu-
ral pH of the water.
Also, a filter must be installed on the system return piping to prevent impurities or
B
sludge from the system clogging and damaging the heat generators.
The filter must be installed when replacing generators in existing systems. The ma-
nufacturer declines any liability for damage caused to the generator by failure to
install or inadequate installation of this filter.
Carry out the relevant connections according to the diagram in sec. 4.1 and the symbols on the unit.
Table 2- SIZE OF CONNECTIONS
MODEL
System flow
Main system return / LOW TEMPERATURE
Gas inlet
In case of installation in bank, the water circuit of each boiler must be fitted with a motor-operated shutoff valve (contro-
lled by the unit, see wiring diagram fig. 85) that prevents reverse circulation with the boiler not working.
A single safety valve must also be provided for each boiler according to the requirements "file R".
The following optional kits are available for this purpose:
052000X0 - MOTOR-OPERATED BUTTERFLY VALVE DN50
052001X0 - MOTOR-OPERATED BUTTERFLY VALVE DN65
If the supply system adjustment is independent of the generators' electronics, it is advisable to create a bypass
between the flow manifold and the system return manifold, to protect the circulating pumps..
System water characteristics
Before installing the OPERA generator, the new or existing system must be properly cleaned in order to eliminate ins-
tallation residues, solvents, sludge and contaminants in general that may compromise the effectiveness of the protective
conditioning treatments. Use neutral cleaning products that do not attack metals, rubber and plastic parts of the gene-
rator/system. Empty, wash and recharge the system in compliance with the following instructions. A dirty system will not
guarantee the life of the generator over time, even with the use of protective conditioners.
OPERA boilers are suitable for installation in heating systems with non-significant
B
entry of oxygen (ref. systems "case I" EN14868). A physical separator (e.g. plate
heat exchanger) must be provided in systems with continuous entry of oxygen (e.g.
underfloor systems without anti-diffusion pipes or open vessel), or frequent (fre-
quent water replenishment).
The water in a heating system must be treated in compliance with the laws and re-
gulations in force, have the characteristics required by UNI 8065, and comply with
the provisions of EN14868 (protection of metallic materials against corrosion).
EN
70
1" 1/4 threa-
ded
1" 1/4 threa-
ded
3/4" threaded
cod. 3541R960 - Rev. 00 - 09/2019
125 220
1" 1/4 threa- 2" threaded
ded
1" 1/4 threa- 2" threaded
ded
1" threaded 1" threaded
320
DN65 flanged
DN65 flanged
1" threaded
139