Purging - Graco ProMix PD2K Electronic Operation

Purging

To purge one color and fill with a new color, see
Color Change, page 60.
Flush Mixed Material
There are times when you only want to purge the mix
manifold and gun, such as:
• end of potlife
• breaks in spraying that exceed the potlife
• overnight shutdown or end of shift
• before servicing the mix manifold, hose or gun.
1. Press Standby
2. If you are using a high pressure gun or an
electrostatic gun, shut off the atomizing air.
If you are using a high pressure gun, engage
the trigger lock. Remove the spray tip and
clean it separately.
If using an electrostatic gun, shut off the
electrostatics before flushing the gun.
332562B
.
3. Trigger the gun to relieve pressure.
4. Set the solvent supply pressure regulator at the
lowest pressure possible, to avoid splashing or
an injection injury. Generally a setting of 25–50
psi (0.18–0.35 MPa, 1.8–3.5 bar) is sufficient.
5. Set the mix manifold to the FLUSH position.
6. Press Purge
a grounded metal pail until the purge sequence
is complete. When done purging, the system
automatically switches to Standby mode,
signalling the user to release the trigger.
7. If the system is not completely clean, repeat.
NOTE: For optimal efficiency, adjust purge
sequence times so only one cycle is required.
8. Trigger the gun to relieve pressure. Engage the
trigger lock.
9. If the spray tip was removed, reinstall it.
10. Adjust the solvent supply regulator back to its
normal operating pressure.
NOTE: The mix manifold and gun remain full of
solvent after purging.
Operation
. Trigger the gun into
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