Graco 3A0868G important safety instructions Pressure Too High Pressure Too Low Pressure B Pressure

Setup Mode Details

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BPressure Too High

BPressure Too Low

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B Pressure

Too High

BPressure Too Low

A Pressure B Pressure

A Pressure B Pressure

FIG. 50. A/B Control Range with Properly Sized Restrictor

NOTE: If the restrictor is too small, it may be necessary to supply more differential pressure than is available in your system.

FIG. 51. A/B Control Range with Too Large a Restrictor

Component A (continuous flow)

Proportioned Material

To Static

Mixer

Component B (pulsed injection)

FIG. 52. Schematic Diagram of Dynamic Dosing Operation

Table 2: Dynamic Dosing Troubleshooting Guide

(for complete system troubleshooting, see Table 3 beginning on page 52)

Error Message	Solution
Ratio Low Error (R1)	• Increase A pressure or decrease B pressure.
	• Use a smaller restrictor.
Ratio High Error (R4)	• Increase B pressure.
	• Clean restrictor or use a larger size.
	• Verify B valve is opening properly.

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