•The magnet has been contaminated (with metal particles).
The NGX cannot be connected directly to a SPS control. (If the wiring diagram as shown on page 3
of the installation instructions of the BR-NWt W 4651-6.11 is modified, the design approval is void)
8. TRANSPORT AND STORAGE
All openings (connections, etc.) are covered with yellow protection caps to prevent the intake of moisture or
dirt. Storage or transportation of sensor and relay should be dry at all times. Pay special attention that no
metal particles can enter the NGX housing to prevent the magnet may get weight down.
9. INSTALLATION
If the standard NGX is ordered there should be a DN 32 (42,4 x 3,2 mm) connection at the surge drum at the
height of the desired level, to weld on the supplied stop valve EA 32.
When a stainless steel execution has been ordered a DN 40 (48,3 x 3,2 mm) connection has to be fitted to
the surge drum at the relevant height of the maximum allowable level.
The sensor should not be fitted directly into the connection of the surge drum, because the
balancing bar would interfere with the boiling refrigerant.
If a different brand valve should be used, a threaded connection G1“-NGX should be ordered, in which the
NGX can be screwed. Please ensure that the liquid refrigerant can reach the balancing bar unhindered and
the inner diameter of the connection to the surge drum is at least 35 mm. The connection to screw in the
NGX showed be sized in such a way that the balancing bar cannot touch the valve seat.
Screw back the counter nut to the end position so you can install the NGX into the seat connection of the EA
32 (take care that the O-ring will not get damaged!). When the installation is finished the cable outlet should
face vertical down. When tightening the counter nut you will achieve a seal similar to a packing box. With the
bracket you may connect the junction box to the valve, whereas the cable connections should face
downwards. Pay attention that the LED is visible at all times!
The electrical connections should be executed according to the wiring diagram as shown in the installation
instructions of the relay BR-NWt W 4651-6.11:
In addition to the limit-contact-relay BR-NWt you will require an auxiliary contactor and a reset switch, which
are not within the scope of delivery. Furthermore it is recommended to install a fault signal indication.
When the maximum level switch NGX shall be used without the relay BR-NWt, only safety extra low voltage
(SELV oder PELV) should be provided to activate the magnet switch.
All electrical connections must we executed by a certified electrician familiar with the system, who is
familiar with the standards and local regulations, e.g. BGV A2 (VBG 4), VDE 0100, VDE 0113 (EN
60204 T1) und VDE 0660 T5 (EN 60439 T1) or equivalent.
10. COMMISSIONING AND START-UP
Operate the maximum level switch NGX only when you are sure that all connections have been installed
properly and the following tests have been executed.
Functioning check:
Turn the housing of the NGX 180°, by carefully loosening the counter nut ¼ turn. On the nameplate you
should be able to read the word “Prüfstellung” in the proper position. If the balancing bar is not obstructed it
will fall down and the magnet will release the reed contact. The red LED will switch off.
Adjusting the limit-contact-relay BR-NWt
See installation instructions fort he relay BR-NWt W 4651-6-11.
