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20 | Installation
4 .4 .9
Power supply cable connection
The power supply cable can be inserted into the boiler using one of the
three holes on the top panel (or one of the three holes on the back panel),
as shown on fig. 18.
Each boiler is equipped with a main 2-pole service switch accessible on
the front door, to quickly and safely disconnect electrical service
Power
supply cable
Fig. 21 Power supply cable connection
To access the electrical box, open the front door (see Fig. 22).
Front Door
Cover Panel
Fig. 22 Electrical Internal Layout
6720866942 (2018/06) US
905 PB Service
Display
Electrical box
Loosen the screws of the cover and remove panel to access the internal
connections shown in Fig. 23.
Electrical box
(open view)
Fig. 23 Electrical box
The majority of the components are installed in the electrical box. Some
of them are mounted on a DIN rail.
(C)
(C)
(A)
Fig. 24 Electrical Box Layout
(A)
= High Voltage Terminal Strip
(B)
= Low Voltage Terminal Strip
(C)
= 905 MN Controllers
(D)
= Pumps relays
(B)
(C)
(D)
SSB
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