Pump Shaking / Air Suctioning; Product Pressure And Atomizing Air Pressure; Pressure Relief/Work Interruption - WAGNER Zip 52 Finishing Operating Manual

VERSION 11/2018

7.3.1 PUMP SHAKING / AIR SUCTIONING

If the pump speeds up suddenly and starts to shake, there is no lacquer left inside the device
and the pump is sucking in air. In this case, more lacquer must be supplied.
If enough lacquer is available and the pump still shakes, the suction filter is clogged and must
be cleaned.
In case air accidentally flows into the pump suction inlet, the compressed air pressure
must be reduced to avoid the pump working at an excessive speed.

7.3.2 PRODUCT PRESSURE AND ATOMIZING AIR PRESSURE

The previously indicated values for the product pressure (1–1.5 bar), and for the atomizing air
pressure (1.5–2 bar) should be considered reference values, since the pressure is dependent upon
the characteristics of the lacquer to be used, above all on its viscosity. If paints or other very fluid
products are used, the product pressure should be set extremely low (to approximately 0.5 bar
or even lower).
On the other hand, highly viscous lacquers require a pressure as high as 3 bar or even higher.
The atomizing air pressure must be set to 1–2.5 bar, depending on the lacquer characteristics. To
obtain perfect atomization and to avoid spray mist, the lowest possible atomizing air pressure
must be used. In some cases, the spray gun must be provided with a very low product pressure
and a very high atomizing air pressure.
Carefully choose the appropriate atomizing cap for the spray gun.
7.4

PRESSURE RELIEF/WORK INTERRUPTION

The pressure must always be relieved:
− after the spraying tasks are finished,
− before servicing or repairing the system,
− before carrying out cleaning tasks on the system,
− before moving the system to another location,
− before something needs to be checked on the system,
− before the nozzle or the filter is removed from the spray gun.
The components for pressure relief on a CE-compliant spraying system include:
− Outlet equipment (return valve) mounted between pump and spray gun.
Process for relieving pressure
1. Close the product delivery valve or any other device installed on the delivery line
(such as outlet valves or spray guns).
2. Close the air cut-off valve. Relieve the pressure in the product line, by opening the
return valve (if installed) or the dispensing device (valve or spray gun).
3. Close and secure return valve and dispensing device.
Note:
Control air pressure is still present.
If the system will process 2K products:
NOTICE
Hardened working material in the spraying system when 2K product is processed!
Destruction of pump and injection system.
Observe the manufacturer's processing rules, particularly in regards to the pot life.
Flush thoroughly before the end of the pot life.
The pot life is decreased by warmth.
ORDER NUMBER DOC 2332848
Zip 52 Finishing
30