Process phases
The process computer recognises the following process phases (depending on the software used):
1. Rest: the pump(s) are at a standstill and the irrigation valves and flush valve are closed. The
hydronic part of the system is filled with irrigation water. The process computer waits until a
start condition is met.
2. Pre-purge: the system pump is running and the flush valve is open so that the contents of the
main irrigation line are discharged. At the same time, the unit prepares irrigation water so that
the old irrigation water in the system is replaced by new irrigation water. This phase can be gone
through when changing the recipe or if the system has been idle for a long period as a result of
which the quality of the irrigation water in the system is no longer clear.
3. Operation: the system pump is running and the fertiliser solution is being supplied to a stock
tank (indirect distribution method) or to the valve sections (direct distribution method). In the
latter case the irrigation valves are controlled open by or via the unit according to the set
conditions. At the same time, the unit prepares new fertiliser solution.
4. Post-purge: the supply pump, if fitted, stops, the valves in the distribution system close (with
the direct distribution method) and the dosage valves close. The system pump continues to run
for 3 s to rinse the dosing channel. This prevents sediment forming in the dosing channel. After
the post-purge the unit returns to the idle phase.
The pre-purge and post-purge phases can be skipped if desired.
Turning the unit on and off
The unit can be switched on and off electrically using the main disconnect switch. In principle,
however, the unit must remain on constantly, unless there is a specific reason for switching the unit
off. The running program can be interrupted via the operating software (see Setting the unit to
maintenance mode (page 26)).
NutriJet - user - 00.00222
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