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308783
Purging
There are two purging procedures: one for purging the
ProMix control of mixed materials, and one for purging
the fluid supply system.
Purging the ProMix of Mixed Material
Follow the procedure below:
After a ratio check,
Before any break or service procedure that
exceeds the pot life of the fluid,
Before servicing the control assembly.
NOTE:
In general, the ratio check valves only need to
be purged after a ratio check. To purge the ratio check
valves, see page 27.
WARNING
INJECTION HAZARD
To reduce the risk of a serious injury,
follow the
Pressure Relief Procedure
on page 17 whenever you are instructed
to relieve the pressure.
1.
Make sure the solvent is compatible with the
equipment wetted parts and with the fluid being
sprayed.
2.
Make sure the operator switch is set
at standby.
7475A
WARNING
FIRE, EXPLOSION, AND ELECTRIC
SHOCK HAZARD
To reduce the risk of fire, explosion, or
electric shock, the air to the gun must be
shut off on a Graco PRO
electrostatic
spray gun to ensure the electrostatic
power is not on when purging.
Air Shutoff Valve
3.
Shut off the air at the spray gun.
4.
If you are using a high pressure gun*, relieve the
pressure as instructed on page 17, and remove
the spray tip before purging the system. Clean the
tip separately.
5.
Turn the control air supply
on (J
-1
, J
-2
).
J
-1
J
-2
7492A
X
6.
Adjust the solvent fluid
supply pressure (X). Use
the lowest pressure pos-
sible to avoid splashing.
7.
Turn the operator switch from
standby to purge.
7477A
* A gun is considered
high pressure
when its maximum working pressure is 900 psi [6.2 MPa, 62 bar] or greater.
