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12.2 connecting the puMps
Turn the control box downward to access terminal boards M1 and M3 used for the electrical connections by
removing the protective covers (see figure 11).
Terminals M1 a – b: connection of the Primary loop pump for the heating system (Plp)
Check the correct size and rating of the pump by referring to graph n° 1, which shows the boiler pressure
losses.
Terminals M3 11 – 12: connection for heating pump (P1)
Terminals M3 13 – 14: connection for hot water tank pump (PDHW)
The electrical specifications of the pump must be as follows:
230 V AC; 50 Hz; 1 A max; cos
> 0.8.
f
If the specifications of the installed pump are different, a relay must be wired between the boiler control circuit
board and the pump.
It is advisable not to adopt any electrical connection other than those described.
connect earth to earth strip
Figure 11
12.3 connecting the hot water tank sensor
Remove the resistor from terminals 9-10 of terminal strip M2 (figure 12), and connect the hot water priority
NTC sensor, which is supplied as an accessory.
The sensing element of the NTC device must be located in the recess provided on the storage tank (figure 12).
The temperature and on-off programming of the domestic hot water supply are selected directly from the
boiler control panel, as described in this manual under the user instruction headings.
InstructIons pertaInInG to the InstaLLer
912.823.1 - GB
24
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