Connecting The Power Supply Cables - Navien NCB-20LHWE Installation & Operation Manual

8.2 Connecting the Power Supply Cables

To correctly establish the boiler's electrical connection, follow
the indications given in the gure and the indications on the
identi cation label for the terminal strip connections.
DANGER
Disconnect the main electrical supply before beginning any
work and make sure all the necessary safety precautions are
taken into account.
1. Remove the cap "A" from the cable gland on the underside
of the boiler.
2. Remove the black silicon seal "B" from the cable gland and
thread it onto cable "C".
B
3. Insert cable "C" into the lid "A" together with the seal "B".
36 Connecting Electrical Supplies
A
C
4. Insert all these elements in the cable gland and press on the
lid "A" until the cable is su ciently xed in place and the unit
is sealed.
The boiler must be connected to the supply terminals,
Note
which are clearly indicated on the left side of the PCB,
via the cable supplied with the boiler for this purpose.
Fuse Size: 5 mm x 20 mm
Note
Fuse Rating: 250 V, 3.15 A
DANGER
This appliance must be earthed.
Electrocution caused by touching live parts can be fatal.
and secure against restart
The boiler must be earthed.
Note
Connection of the whole electrical system of the boiler,
including any heating controls, to the electrical supply
must be through one common isolator and must be
fused 3.15 Amp maximum.
Detail View
Live
Earth
Neutral