13
Connection of level electrode
To connect the level electrode(s) use screened multi-core control cable with a min. conductor size
0.5 mm
2
, e.g. LiYCY 4 x 0.5 mm
2
.
Max. length 100 m with an electrical conductivity of the boiler water > 10 μS/cm at 25 °C.
Wire terminal strip in accordance with the wiring diagram.
Fig. 8, 9
Connect screens to terminals 5 and 13 and to the central earthing point
(CEP)
in the control cabinet.
Electrical Connection
– continued –
1. Undo screw
j
.
Fig. 7
2. Remove upper part
l
of the terminal box from the level electrode but leave insulating plate
n
on
contact plate
o
.
3. Remove cover
k
.
4. Press connecting plate
m
out of upper part of the terminal box
l
.
The upper part of the terminal box can be turned in steps of 90°.
5. Detach cable gland
q
and cable clamp
p
from upper part of the terminal box
l
.
6. Run cable through cable gland
q
and upper part of the terminal box
l
and wire terminals of the
connecting plate
m
in accordance with wiring diagram.
Fig. 8
7. Press connecting plate
m
into the upper part of the terminal box and align cable.
8. Fix cable with cable clamp
p
and cable gland
q
.
9. Put cover
k
in place and insert screw
j
.
10. Put upper part of the terminal box onto the level electrode and fix it with screw
j
.
NRG 16-50 S with four-pole connector
Tools
n
Screwdriver size 1
n
Screwdriver size 2.5, completely insulated according to DIN VDE 0680-1
n
Open-end spanner A.F. 18 (19) mm
