Flowserve NRG 16-51 - Manual (Page 20)

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Connection of level electrode
To connect the level electrode use screened multi-core control cable with a min. conductor size
0.5 mm  , e.g. LiYCY 4 x 0.5 mm  .
Max. length 00 m with an electrical conductivity of the boiler water > 0 μS/cm at 5 °C.
Max. length 30 m with an electrical conductivity of the boiler water < 0 μS/cm at 5 °C.
Wire terminal strip in accordance with the wiring diagram.
Fig. 18
Connect screens only to terminal 5 of the level switch NRS -5.
Electrical Connection
. Undo screw 9. Fig. 12
. Remove upper part a of the terminal box from the level electrode but leave insulating plate c on
contact plate d.
3. Remove cover 0.
4. Press connecting plate b out of upper part of the terminal box a.
The upper part of the terminal box can be turned in steps of 90°.
5. Detach cable gland f and cable clamp e from upper part of the terminal box a.
6. Run cable through cable gland f and upper part of the terminal box a and wire terminals of the
connecting plate b in accordance with wiring diagram. Fig. 19
7. Press connecting plate b into the upper part of the terminal box and align cable.
8. Fix cable with cable clamp e and cable gland f.
9. Re-attach cover 0 and insert screw 9.
0. Put upper part of the terminal box onto the level electrode and fix it with screw 9.
NRG 16-51F, NRG 17-51F, NRG 19-51F with aluminium terminal box
NRG 16-51, NRG 17-51, NRG 19-51 with four-pole connector
. Unscrew screws g and remove housing cover i. Fig. 12
. Undo cable gland h. Pull cable through cable entry.
3. Remove terminal strip k from circuit board.
4. Connect terminal strip according to the wiring diagram.
Fig. 20
5. Attach terminal strip.
6. Tighten the cable gland in order to seal the cable entry.
7. Mount housing cover i and tighten screws g.