Graco EcoQuip EQ200T Operation, Repair, And Parts page 13

14. Wait for pot pressure to increase. NOTE:
can take up to several minutes for the pot to
pressurize.
NOTE: The bung cannot be pushed down unless
NOTE: NOTE:
all of the pressure in the pot is released by
opening the dump valve.
15. Set the pot pressure 30 psi (2.0 Bar, 0.2 MPa)
higher than the intended blast pressure. Quickly
open and close the dump valve after the pump
stalls. Relieve pot pressure to 40 psi (2.7 Bar,
0.27 MPa) before closing the dump valve.
Repeat until pot pressure is consistent.
16. Turn the selector valve to WASH.
17. Set the blast air pressure 30 psi (2.0 Bar, 0.2
MPa) lower than the pot pressure while blasting.
NOTE: In order to adjust the blast pressure, the
NOTE: NOTE:
blast control must be engaged. For the initial
setting, leave the abrasive ball valve closed.
NOTE: NOTE: Engage and release the blast control NOTE:
handle each time the blast regulator is adjusted.
18. Turn the selector valve to BLAST.
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NOTE: It
NOTE: 19. Open the abrasive ball valve.
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NOTE: NOTE: Make sure the pot pressure returns to the NOTE:
initial setting (it will not return to the initial setting
if the metering valve is closed).
20. Engage the blast control switch and begin
blasting.
NOTE: You may have to wait 1–2 minutes for the
NOTE: NOTE:
abrasive material to reach the nozzle.
NOTE: NOTE: Pot pressure and blast pressure should NOTE:
equalize during blasting. Only set pot pressure
with the abrasive ball valve closed. Never adjust
pot pressure while blasting.
Operation
13