Operating manual NR-12-TRS-2 Page: 3
Relay K2 switches the filter
pump on once the water
level reaches the top
electrode.
Relay K3 switches the
pump off once the water
level falls below the "dry
operation protection"
electrode.
Connecting the submerged electrodes:
When connecting the submerged electrodes you must ensure that the sequence is not mixed up,
because mixing up the electrodes always leads to failures in the installation.
If the "forced switching" function is not required, the corresponding submerged electrode (terminal 8)
can be omitted. Terminal 8 then remains unused. It does not require bypassing.
All other submerged electrodes are necessary for control system function and may not be omitted or
bypassed.
Functional information:
The NR-12-TRS-2 collection reservoir control system has the following functions:
a) Water level regulation.
Once the water level falls below the "solenoid valve OPEN" submerged electrode due to water
losses in the swimming pool, e.g. due to evaporation or backflushing, the solenoid valves opens
and the fresh water flowing in raises the water level. As soon as the rising water level reaches
the "solenoid valve CLOSE" (terminal 5) submerged electrodes position and contacts the
electrodes, the solenoid valve closes freshwater inflow off.
b) Filter pump dry run protection.
If the water level sinks to below the "dry run protection pump OFF" submerged electrode due to
water losses in the collection reservoir, e.g. due to backflushing, the collection reservoir control
system switches the filter pump off so that it is not damaged by dry running. As soon as the
water level rises to the height of the "dry run protection pump ON" (terminal 6) and contacts the
electrode, the collection reservoir control system switches the filter control system on
again automatically.
c) Forced switching.
If the water level rises in the collection reservoir due to water displacement in the swimming pool
and contacts the "forced switching ON" submerged electrode (terminal 8), the NR-12-TRS-
2 collection reservoir control system switches the filter pump on automatically (in connection with
an filter control system). Now the water is pumped back into the swimming pool to prevent
unnecessary loss of valuable water. The "forced switching ON" submerged electrode must be
located a few centimetres deeper than the overflow.
An electroless closed solenoid valve must be used.
A complete function test must be carried out once installation and assembly work has been completed.
Forced switching
Max. level
Min. level
Dry run protection
Ground
