
18
R
Electrical safety of the appliance is only guaranteed by correct grounding, in compliance with the
applicable laws and regulations.
Connect the boiler to a 230V mon ground power supply by means of the three-pin cable
supplied with it and make sure you connect polarities correctly.
Use a double-pole switch with a contact separation of at least 3mm in both poles.
In case you replace the power supply cable fit a HAR H05 VV-F’ 3x0.75mm
2
cable with an 8mm
diameter max.
The fuse, a fast-acting type rated 2A, is incorporated into the power supply terminals (remove the
black fuse holder to enable inspection and/or replacement).
IMPORTANT:
Check that the overall current drawn by accessories connected to the appliance is
less than 2 A. If the value is greater, a relay must be wired between the boiler control circuit board
and the accessories drawing the higher current.
13. Connecting the mains
supply
Figure 9
Turn the control box downwards and access the terminal blocks M1 and M3 by taking off the main
protective cover.
The pumps of the heating system (P1 and P2) have to be connected to boiler terminal block follow-
ing the wiring of figure 10, a relay must be wired between the boiler control circuit board and the
pumps.
If the boiler unit’s electronic card is wired up to a single pump with these characteristics
230 V AC; 50 Hz; 1 A max; cos
φ
> 0.8.
then it is not necessary to add a relay.
Check the correct size and rating of the pump by referring to graph n° 1, which shows the boiler
pressure losses.
13.1 Connecting the pump -
heating system
0601_2003/CT_0674
Terminal board
Terminal board
Cover
Terminal board
Cover