30
3.2.10. Plumbing connections
Prior to installing the boiler, the hydraulic system must be cleaned thoroughly to remove any impurities that are present in the system com-
ponents and would damage the pump and the heat exchanger (see subsection 3.2.4.).
CENTRAL HEATING
The CH flow and return pipes must be connected to the relevant 3/4” fittings on the boiler (pics. from 4 to 10).
When calculating the size of the pipes in the CH system, bear in mind load losses caused by radiators, thermostatic valves, radiator gate val-
ves, and the configuration of the system itself.
The boiler safety valve must be discharged into the sewage system.
If this precaution is not taken and the safety valve activates, boiler room flooding may occur.
The MANUFACTURER cannot be held liable for damage resulting from failure to follow this technical precaution.
DOMESTIC HOT WATER (for models CTN and CTFS)
DHW flow and mains water inlet pipes must be connected to the 1/2” fittings on the boiler (pics. from 4 to 10).
The hardness of the water supplied to the boiler may increase the cleaning frequency for the secondary plate-heat exchanger.
If the water is particularly hard, it may be necessary to install a suitable water treatment device for domestic use that
complies with the applicable laws and standards.
Water treatment is always advisable when the hardness of the water supplied to the boiler is more than 20°f.
Water treated using standard water softeners may not be compatible with some components in the system.
3.2.11. Adjustable by-pass
The boiler is equipped by an adjustable by-pass. By-pass operation can be inhibited.
Pic. 25a shows an adjusting by-pass screw set for by-pass operation preclusion.
Pic. 25b shows an adjusting by-pass screw set for by-pass operation.
The boiler is supplied with by-pass set to closed by-pass.
3.2.12. Power mains connection
The boiler is supplied with a three-wire power cable connected to the electronic board,
and it is provided with an anti-rupture firming clamp.
This boiler must be connected to a 230V-50Hz power supply.
When connecting the boiler to the power mains, keep the phase / neutral polarity sequence.
Installation standards must be complied with and are considered an integral part of this manual.
An easily accessible two-pin switch must be installed outside the boiler. The minimum distance
between the contacts of the switch is 3 mm. The switch must allow power supply interruption
so that maintenance and servicing can be performed safely.
The power supply to the boiler must be fitted with a differential magneto-thermal automatic switch of appropriate shut-down capacity.
The electricity supply must be appropriately earthed.
This safety precaution must be verified. If in doubt, ask a qualified electrician to check the electricity supply.
The MANUFACTURER cannot be held liable for damage due to failure to earth the system.
Gas, hydraulic or CH system pipes are not suitable for earthing electricity supplies.
A
Closed
by-pass
Open
by-pass
B
pic. 25 - Adjustable by-pass
