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3.9
Hydraulic connections
3.9.1
Central heating
Prior to installing the boiler, the hydraulic system is to be cleaned in order to remove impurities; they could be present in system components
and damage the pump and the heat exchanger.
The CH outlet and return pipes must be connected to the respective 3/4" connectors M and R on the boiler (see Fig. 5 Paper template).
When calculating the cross section of CH system pipes, bear in mind load losses induced by radiators, thermostatic valves, radiator gate valves,
and the configuration of the system itself.
WARNING
It is advisable to convey the discharge flow of boiler safety valve to the sewer system. Should the above precaution not be
implemented and the safety valve be activated, boiler room flooding may occur.
The manufacturer shall not be held responsible in case of damage to people, animals, or property due to failure to follow the above
mentioned instructions.
3.9.2
DHW
Prior to installing the boiler, the hydraulic system is to be cleaned in order to remove impurities; they could be present in system components
and damage the pump and the heat exchanger.
Cold water inlet and DHW outlet shall be connected to the boiler through the dedicated 1/2" F and C fittings (see Fig. 5 Paper template).
Hardness of water supplied to the boiler may increase the plate heat exchanger cleaning/replacement intervals.
3.10 Connection to electrical mains
The boiler is supplied with a three-poled power cable, already connected to the electronic board and it is provided with a safety clamp.
The boiler is to be connected to a 230V-50Hz electrical power supply.
When connecting it to power mains, follow correct phase / neutral polarity sequence.
Installation standards must be complied with and they are herein considered as entirely transcribed.
An easily accessible two-poled switch, with a minimum 3 mm distance between contacts, is to be installed ahead of the boiler. The switch is to
allow power supply cut-off in order to safely perform maintenance and service procedures.
Power supply to the boiler must be fitted with a residual-current circuit breaker having suitable disconnection capacity. Electric power supply
must be properly earthed.
The above mentioned safety measure must be verified. If in doubt, ask a qualified technician to thoroughly check the power network.
WARNING
The manufacturer cannot be held responsible for any damage caused by failure to earth the system correctly: gas, water, or CH
system pipes are not suitable for grounding power networks.
3.11 Connection to ambient thermostat (optional)
The boiler is designed to be connected to an ambient thermostat (optional, not compulsory).
Ambient thermostat contacts must be properly sized in compliance with a load of 5 mA at 24 Vdc.
The ambient thermostat cables must be connected to terminals (1) and (2) of the electronic board (see Wiring diagram on page 40) after
eliminating the jumper supplied as a standard with the boiler.
The ambient thermostat cables are not to be grouped together in the same sheath as power mains supply cables.
Instructions for the installer
33
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