Hardi ZENIT A750, Instruction Book

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3 - Description
Liquid circuit
Technical information
All the liquid circuit functions are operated via the MANIFOLD system and the pressure collector. The use of
pictorial symbols helps to clearly identify these functions.
HLC Circuit
The pressure circuit is called HLC (Hardi Liquid Circuit). designed
for diaphragm pump. The pressure collector is synthetic and deli-
vers the flow to three different places.
The HLC pressure collector is fitted with three mechanical valves
which allow the functions of the liquid circuit to be operated.
The first valve
sends the flow of water with pressure to the
agitator. The second activates the powder mixer so as to
clean the filter at the entrance to the tank when powder has been
loaded through it (remember to close the valve after use or this
may cause a lack of pressure). The third valve
activates the
rotary nozzle for cleaning inside the tank when it is cleaning the
liquid circuit with clean water.
Each function is identified by a pictograph.
(
and are optionals)
The MANIFOLD System
Depending on the model, there may be a MANIFOLD valve. This is
a three-way manual valve that allows you to select the tank from
which the pump is to aspirate. It is black and is situated on the lo-
wer left-hand side of the blower, above the suction filter. Optiona-
lly, a blue return manifold valve can be fitted, which allows a return
flow circuit to be set up. This valve is to be found at the front of the
equipment, behind the operating unit.
3.4
Rinse tank
Main tank
Selection lever
A
B
C
A
B
C
Safety valve
The safety valve acts like a fuse when the circuit carries out an
operation that causes a sudden increase in pressure.
This valve normally keeps the return manifold in a closed po-
sition, by way of a spring and a washer. When the amount of pres-
sure in the circuit is above the maximum allowed for the valve, this
opens and allows the flow to return.
This valve is 15 bar.
Do not eliminate the safety valve from the liquid circuit as
this could put your safety at risk.
A
A
B
C