WAGNER U580.00, Translation Of The Original Operating Manual, Page: 28 / 52

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Unica 4-270
.
OPERATING MANUAL
EDITION 04 /2007 PART NO. ZZB006ENG
5.2.2
PRESSURE RELEASE PROCEDURE
1. Interrupt the pump compressed air supply.
2. Open the usage and discharge the remaining pressure inside the pump and circuit.
3. To guarantee a complete depressurisation of the pneumatic motor, pull the ring on the
safety valve (see Paragraph 4.4.1).
5.2.4
FILLING WITH WORKING FLUID
In this description reference is made to the exemplifying diagram given in Paragraph
5.1.6.
1. Make sure the pump is correctly connected to a grounding terminal. Please see
Pragraph 5.1.7 - “Grounding” for further informaion.
2. Check the tightness of all fi ttings and make sure they are tight enough.
3. Connect the pump suction duct to the tank with the working fl uid (I). For example, if a
drip-in pipe is used, dip it in the barrel of the product to be pumped.
4. Connect the pump delivery duct to the usage. If a washing is in progress, direct the
product outlet pipe into the container collecting the solvent.
5. Close the pump air pressure controller (C) , pressurise the compressed air supply line
and open the air shut-off valve on the pump (D).
6. Slowly open the air pressure controller on the pump (C) until it starts to work. Have the
pump work slowly until all the air left inside the suction and delivery circuits has been
discharged. Continue until the pump has correctly primed.
7. Only if the pump is being washed with solvent, have it cycle until the clean solvent
fl ows inside the delivery circuit. Then close the pump air pressure controller (C).
5.2.3
PUMP WASHING
The Unica 4-270 pump is tested in the factory with oil.
In case eventual testing fl uid residues may contaminate the working material, carry out a
preliminary washing using a solvent compliant with the product. To perform the washing
follow the instructions in the following paragraph, considering the solvent instead of the
working material.
5.2.5
PUMP STOP
For a short-term stop, perform the pressure release procedure (Paragraph 5.2.2).
For a permanent stop, such as for example an overnight standstill:
1. Clean the pump fl uid section by washing it with a compliant solvent.
2. Leave the solvent inside the pump fl uid section.
3. Perform the pressure release procedure (Paragraph 5.2.2).
For a stop preceding maintenance or disconnection of the pump, see the instructions
given in Paragraph 5.3.