ITC HD7515 Manuel D'instructions page 10

Dos & Don'ts
INSTALLING INLETS
When installing your vacuum inlets, we recommend that the principle of electric
polarity be taken into account. Ensure that the wire connected onto contact A on
inlet 1 is the same as that connected to contact A on inlet 2, and so on. Do not
cross, reverse or interchange wires.
A
B
A
B
1 INLET
2 INLET
A
B
A
B
1 INLET
2 INLET
10 Installation