Fondital ITACA KC 24, Инструкция по установке, эксплуатации и обслуживанию, Страница: 58 / 100

Instructions for the installer
58
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 par. Wiring diagrams on page
71 )
after having eliminated 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.
3.12 Installation of the (optional) external probe and sliding temperature operation
The boiler can be connected to an (optional) external temperature probe (optional, provided by the manufacturer) for sliding tempe-
rature operation.
WARNING
Only original external temperature probes supplied by the manufacturer must be used.
If non-original external temperature probes are used, correct operation of the boiler and external probe cannot be gua-
ranteed.
The external temperature probe must be connected by means of a double insulated wire, minimum cross-section 0.35 sq.mm.
The external probe must be connected to terminals 5-6 of boiler electronic board.
WARNING
The temperature probe cables must NOT be routed together with power cables.
The temperature probe must be installed on an outside wall facing NORTH - NORTH EAST, in a position protected from weather.
Do not install near a window, ventilation openings or sources of heat.
The external temperature probe automatically modifies the CH flow temperature in relation to:
• Measured external temperature.
• Selected thermoregulation curve.
•
Selected fictitious ambient temperature.