31
4.5.5.
Electrical supply connection
The boiler is supplied with a three-poled power cable, already connected to the electronic board and it is provided with an anti-rupture
firming clamp.
The boiler is to be connected to a 230V~50Hz electrical power supply.
When connecting the boiler to power mains, follow correct phase/neutral polarity sequence.
Installation standards BS7671 IEE WIRING REGS must be complied with and are which are considered herein integrally transcribed.
An easy accessible two-poled switch is to be installed externally to the boiler, in an easy to reach position. The switch minimum distance
between contacts is to be 3 mm.
The switch is to allow power supply interruption in order to safely perform maintenance and service procedures.
Power supply to the boiler is to be fitted with a differential magnetic-thermal automatic switch of appropriate shut-down capacity.
Electrical power supply is to be appropriately earthed.
The above mentioned safety measure is to be verified. When in doubt, ask a qualified technician to thoroughly check the power network.
DO NOT:
• touch the electrical connections with wet hands
• put any electrical cables under stress
• leave the electrical components exposed to weather conditions
Check and inspect the cable supplied with the boiler do not use if this cable is damaged. The boiler should be
connected in line with the requirements of the IEE electrical regulations and should only be connected by a competent
person.
The manufacturer shall not be held responsible for any damage due to failure in grounding the system: gas, hydraulic,
or CH system pipes are not suitable for grounding power networks.
4.5.6.
Room thermostat connection (optional equipment)
The boiler can be connected to a room thermostat (not supplied with the boiler).
Room thermostat contacts must be properly sized for 5 mA at 24 V D.C.
The room thermostat must be connected to the terminal block shown in pic. 39, after removal of the jumper which is delivered as stand-
ard fitting to the boiler.
Room thermostat wiring must not be grouped together with power mains supply cables.
4.5.7.
External temperature probe installation (optional equipment) and “sliding temperature” operation
The boiler can be connected to an external temperature probe (optional equipment), which adjusts CH flow temperature for temperature
compensation operation (pic. 28).
The manufacturer supplies 0SONDAES01: external probe for direct connection to the boiler.
pic.28