Consult the manual for the HortiJet pump to regulate the direction and bleed
air from the pump.
5.6
Using the dosing channels for the first time
Ridder Growing Solutions advises you to test the HortiJet first with water,
before using fertilizers and/or acid.
To prepare the dosing channels for use, complete the following steps:
1. Place the suction hoses into a bucket of fresh water and submerge them
completely.
2. Check that the manual valves for the inlet and outlet to the HortiJet are open.
3. Check that the pressure control valves are set correctly (see section
"Pressurizing the HortiJet" on page 38).
4. Test the dosing channels by irrigating briefly using the fertigation recipe.
5. Check for leaks. Rectify any leaks found.
6. Place the suction hoses in the correct fertilizer tank/acid tank.
Please exercise caution when working with acid.
5.6.1
Even fertiliser dosing
Due to differences in viscosity, some fertilizers may flow through the venturi faster
than others. This can cause uneven dosing. This can be prevented by opening or
closing the needle valves (loosen the knob on the front of the needle valve to access
the adjuster screw). This ensures that the liquid levels in all dosing channels are the
same and operating at the capacity set. The liquid level can be read using the sight
glass in the dosing channel.
Figure 5-8:
Fertilizer dosing
No.
Name
No.
Name
1
Needle valve
2
Sight glass / flowmeter
HortiJet-Go!
41