Graco EQ300C manual 0 0 0 8 8 0 0 0 3

Operation

20. Open the abrasive ball valve.

NOTE: Make sure the pot pressure returns to the initial setting (it will not return to the initial setting if the metering valve is closed).

21.Engage the blast control switch and begin blasting.

NOTE: You may have to wait 1–2 minutes for the abrasive material to reach the nozzle.

NOTE: Pot pressure and blast pressure should equalize during blasting. Only set pot pressure with the abrasive ball valve closed. Never adjust pot pressure while blasting.

22.Slowly adjust the abrasive meter valve while the abrasive is blasting from the nozzle. Typical adjustment ranges from 1/8 to 1/4 turn open.

NOTE: The DataTrak can be used to assist in setting the pump cycle rate. Optimal abrasive media consumption typically occurs with the cycle rate set at 7–10 cycles per minute.

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NOTE: Use a piece of test material similar to what you will be blasting.

NOTE: Always start as gently as possible and then increase the blast force as necessary to clean without doing any damage to the substrate. When properly set, the pump should cycle 7-10 times per minute. High production rate users may need to increase cycle rate above 10 cycles per minute.

NOTE: Close the abrasive ball valve whenever you stop blasting for more than 2-3 minutes. This will help to extend the service life of the diaphragm valve.

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