DDPHCL2_man_r1.0 – 03/2021 Page 8
HYDRAULIC CONNECTIONS
Check that the suction line does not exceed the maximum height of 1.5 m from the tank bottom.
Unscrew the pipe-wrench nut and remove the two protective caps from fittings (in the case a pump
head needs to be removed, it is recommended to reuse the protective caps, to prevent any leakage
from the pump body).
Note: If the product to be dosed is sulfuric acid (10% max concentration), previously remove any water
from the pump and use polyethylene pipes.
All operations to tighten the pipe connections of the pumps must be done by hand, without using any
tools (e.g. pliers squeeze tube), to avoid damaging the hydraulic connections.
Warning! Before performing any kind of operation on the pump, carefully read the HSDS of
the chemical to be dosed, in order to define the proper behaviours to be followed, and the
personal safety equipment to be worn.
Suction Line
(also see drawing)
1. Unscrew the fixing nut of the connector located on the bottom left
side of the pump head and marked in the figure with an incoming
arrow.
2. Cut the transparent PVC Crystal tube.
3. Insert the fixing nut and the tube-wrench on the tube.
4. Mount the tube on the conic tube-holder of the suction connector,
pushing it until it reaches the stop collar.
5. Fix the tube by screwing the fixing nut onto the suction connector of
the pump head.
6. Locate the PVC Crystal tube inside the tank and/or the suction lance.
7. Unscrew the fixing nut of the foot filter.
8. Cut the transparent PVC Crystal tube.
9. Insert the fixing nut and the tube-wrench on the tube.
10. Mount the tube on the conic tube-holder of the foot filter connector,
pushing it until it reaches the stop collar.
11. Fix the tube by screwing the fixing nut onto the connector of the foot filter.
12. Screw the foot filter onto the suction lance (if used) and/or locate it in its working place.
Notes:
•The foot filter must be located at a minimum distance of 5 cm from the tank bottom.
•If a dense product is dosed, it is recommended to remove the small inside filter from the foot valve,
in order to facilitate the suction.
Injection Line
(also see drawing)
1. Unscrew the fixing nut of the connector located on the bottom right side of the pump head and
marked in the figure with an outgoing arrow.
2. Cut the white, semi-rigid polyethylene tube.
3. Insert the fixing nut and the tube-wrench on the tube.
4. Mount the tube on the conic tube-holder of the suction connector, pushing it until it reaches the stop
collar.
5. Fix the tube by screwing the fixing nut onto the head connector of the pump head.
6. Place the injection tube avoiding as much as possible the curves and ensuring that the pulses do
not make the tube rub against rigid bodies.
7. Perform electrical connections (see related section in the manual) and power the pump.
8. At the injection point on the pipeline, mount a ½” GAS connection, internally threaded (not supplied.
