6
PROTHO Technical Manual
Bores Group S.r.l.
a) Connecting the detergent injection
circuit (fig. 3)
-
To install the relevant pipe fitting, drill a 12.5 mm
Ø hole in the tank above the water level in a
favourable position.
-
Push the threaded part of the union elbow through
the previously drilled hole from the outside of the
tank (if necessary use a file to remove any burrs
that might prevent the gasket from sealing).
-
Put the gasket on the thread of the union elbow
from the inside of the tank and then carefully
tighten the relevant bolt. Do not overtighten in
order not to damage the components of the union
elbow.
-
Connect the pump’s injection pipe fitting to the
union elbow previously installed in the tank using
the special pipe supplied.
a) Connecting the rinse aid injection circuit
(fig. 4)
When there is this type of installation you have to
identify the ideal point for fitting the components,
considering their dimensions and easy access for
being able to install them readily.
-
Remove the rubber pipe into which the product
will be injected.
-
Push the end of the previously cut pipe onto the
union tee (T Venturi) making sure that the water
flow follows the direction stamped on the union
tee itself.
-
Block the rubber pipes previously fitted onto the
union tee with two metal clamps (not supplied).
If the dishwashing machine is already fitted with a
special injection pipe fitting, a rinse aid injection valve
that allows you to eliminate the operations described
above, is available on request.
-
Using the pipe supplied (made of polyethylene)
connect the delivery pipe fitting of the pump to the
injection pipe fitting, with a nonreturn valve,
locking the threaded locking rings carefully.
4 STARTING
Once the electrical and water connections of the
metering pump are complete you can proceed to
starting it.
When starting the pump for the first
time, the dishwashing machine has to perform
several washing cycles on empty to allow the
device to fill the pipes in the injection circuit.
This snag can be overcome by manually priming the
pump as follows:
ATTENTION!!
This operation is valid only for models with
asynchronous motors (motors without brushes).
On the other hand in the other models, with motor in
continuous cycle (with brushes), it is NOT POSSIBLE
to make this operation.
-
Take the utmost care to check the direction of
rotation of the pump, since an incorrect manoeuvre
could irreparably damage the motor reducer of the
device.
-
Turn the rollers support rotor in the direction of
rotation of the pump (see arrow) using a 6 mm
setscrew (Allen) wrench in the hexagonal hole on
the device until the circuit is completely full (fig. 5).
This operation must be carried out by skilled and
qualified personnel only when the pump is
started for the first time and after each time the
pumping pipe is replaced.
-
Check that there are no leaks from the water
connections.
4.1 REGULATING THE CAPACITY
The functional characteristics of the metering pump
are completed with some technical solutions:
-
intermittent electronic regulation (fig. 6)
this regulation allows you to vary the capacity of the
pump quickly and rapidly by turning a special knob
on the front of the container of the device.
-
conductimetric electronic regulation (fig. 7)
this regulation, on the other hand, allows you to keep
the concentration of the detergent in the water of the
dishwasher’s washing tank constant. To increase or
decrease the dosage, turn the knob on the front of
the container of the metering pump manually.
Specialised personnel must do these regulations
as several checks must be done on site, such as:
the type of detergent used and any hardness in
the water, etc.
