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# 6 Pump pressure adj

Old # 6 Ray Burner that has a viscosity adjustment control. How do you adjust it? There are 2 set screws on it for adjustment and I do not know what they do. We have a problem keeping the flame signal. Pressure is down on the gauge to 30#. The other boilers run fine at 50#. Not sure how to increase pressure on burner. Do I adjust viscosity control or pump pressure?
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