M039150CF
22
Electrical connections
To execute the electrical connections, proceed as follows:
1
remove the cover from the electrical board, unscrewing the fixing screws;
2
execute the electrical connections to the supply terminal board as shown in the following diagrams and in the wiring diagrams (see
related chapter),
3
check the direction of the fan motor (see next pargraph)
4
refit the panel cover
Connect the three-phase supply to terminals L1, L2, L3 and PE (ground); then shunt the phase and neutral wires (Fig. 19) for the auxi-
liaries on the printed circuit (N-terminal = neutral; L-terminal = phase)
Respect the basic safety rules. make sure of the connection to the earthing system. do not reverse the phase and
neutral connections. fit a differential thermal magnet switch adequate for connection to the mains.
ATTENTION: before executing the electrical connections, pay attention to turn the plant’s switch to OFF and be
sure that the burner’s main switch is in 0 position (OFF) too. Read carefully the chapter “WARNINGS”, and the
“Electrical connections” section.
IMPORTANT: while connecting electric supply wires to burner’s teminal block be sure that ground wire should be
longer than phase and neutral ones.
MC supply terminal block
Keys
IG: main switch
KM1: fan motor contactor
KM2: pump motor contactor
MP: pump motor
MV: fan motor
TP: pump motor thermal cutout
TV: fan motor thermal cutout
Fig. 19
Auxilia
ry
r
e
lais po
wer su
pp
ly
