Nice Riva Serie Instructions Et Avertissements Pour L'installation page 54

12 pass the power cable through the previously prepared cable
duct; to make the electrical connection to the control unit, see
the chapter "ELECTRICAL CONNECTIONS" and refer to the
control unit manual ("Figure 17")
17
12 – ENGLISH
13 position the covers (L), (M) and (N) in the sequence described:
("Figure 18")
1 - place the top cover (L) on the foundation box (A) and slide it until
it stops, simultaneously inserting the cover (M) into the slot
2 - secure the cover (L) using the screws provided
3 - secure the lower cover (N) using the screw provided.
18
2
2
M
3
N
M
1
L
A
N