- 23 -
13. DEPRESSURISATION
With the aim of reducing the risk of severe bodily injury,
including the injection of products or injuries caused by
moving parts of the equipment or electric shock, the proce-
dure described below must be followed as soon as the
system is halted, during assembly, cleaning or changing
the cap and also when spraying is interrupted.
1) Set the gun safety catch.
2) With the unit, hose and gun pressurised, turn the unit's
pressure regulator control (No.5 Fig.1) to place it on the
minimum position (left turn, anticlockwise).
3) Remove the spray gun safety catch. Holding a metallic
part of the spray gun to the side of a correctly-grounded
bucket, press the trigger to drain the product (aim the jet
toward the side of the bucket) until the pressure gauge
(No.7 Fig.1) indicate "0".
4) Lock the spray gun trigger with the safety latch.
5) Place the motor switch in the “O” position (off).
6) Open the product return key (No.4 Fig.1).
If you have reason to believe the cap or the hose is
completely clogged, or that the pressure has not been
totally eliminated after having followed the procedure
described above, loosen the hose connector VERY
GENTLY in order to reduce the pressure gradually, and
finally remove it altogether. Clean the cap or the hose
immediately.
14. CLEANING
The spray gun, hoses and the rest of the unit must be
cleaned with the appropriate thinner, in order to remove
any remaining product after each use. The useful service
life of the unit depends largely on the effectiveness of the
cleaning process.
The unit must be cleaned:
- Before using it for the first time, in order to eliminate the
traces of maintenance oil that the equipment comes with
from the factory.
- After each use.
- When proceeding to apply a different product (different
colour or characteristics) to what we are currently using.
Before proceeding to clean the unit you must have
followed each and every one of the steps described in
the section Stopping when work is finished (Section
11.2). This implies that the unit and its accessories
must be depressurised and without any product
inside.
Always use an appropriate thinner when cleaning the unit.
Always use water for waterborne products, for other
products always use whatever is recommended by the
manufacturer of the product to be applied.
1- Ensure the pressure regulator (No.5 Fig.1) is at the
minimum setting (turn anticlockwise), that the drain
stopcock is open (No.4 Fig.1), that there is no pressure in
the interior and that the motor switch in set to "off".
2 - Add the thinner to the external container where the
suction probe (No.1 Fig.1) is located, by inserting the
product return hose (No.3 Fig.1).
Note: If the equipment is fitted with a gravity tank instead
of a suction probe, pour the cleaning solvent into this tank.
Insert the drain tube into the same tank.
3 - To start the engine
4 - Turn the pressure regulator (No.5 Fig.1) clockwise, until
you see that the product circulates through the unit and
flows through the return hose (No.3 Fig.1). Turn the
pressure regulator again in the opposite direction, to the
minimum setting (to the left).
5 - When the solvent starts to flow through the product
return hose (No.3 Fig.1) close the return key (No 4, figure
1).
6 - Place the gun resting a metallic part (such as the hand
protector, for instance) against a correctly grounded meta-
llic container which contains the cleaning solvent.
7 - Remove the safety catch from the gun and press the
gun trigger.
8 - Turn the pressure regulator (No.5 Fig.1) gently to the
right. Within a few seconds cleaning solvent will issue from
the head of the spray gun. Allow the system to circulate for
a few minutes, until the equipment, hose and spray gun is
thoroughly clean. Change the cleaning solvent as many
times as may be necessary to clean all the components
mentioned.
9 - Turn the pressure regulator once again (No.5 Fig.1) to
the minimum setting. Release the gun trigger.
10 - Open the drain stopcock (No.4 Fig.1). Turn the pressu-
re regulator once more to the right. Within a few seconds
the cleaning solvent will run from the drain tube (No 3,
figure 1). Allow this to circulate for a few seconds.
11 - Turn the pressure regulator (No.5 Fig.1) gradually to
the left, to reach the minimum setting.
12 - Stop engine.
ATTENTION
Always leave the suction valve full of cleaning solvent,
in order to avoid any product remaining inside the
equipment from hardening in contact with the air.
