Dover PSG Neptune, Installation Operation & Maintenance

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13
INSTRUCTIONS FOR OPERATION OF POST-DILUTION UNIT
(Applies to 2 stage dilution furnished on models PAD/PMD-3000 and PAD/PMD-3000R only)
The models PAD/PMD-3000 include two separate water flow indicators with separate water flow adjustment
knobs. The primary dilution flow meter is located on the front face for the Polymaster. The second dilution or
post dilution flow indicator is inside the unit with the rate setting valve at the top of the flow meter.
When using the dual dilution unit, a maximum of 20gpm (1200 gph) of water may be passed through the
primary flow circuit into the Gatlin mixing chamber. Up to 30gpm (1800 gph) of water may be added by
means of the secondary or post dilution water flow indicator.
NOTE:
If the Polymaster stops and the amber fault light comes on when
turning on the post dilution unit, sufficient water flow or pressure
may not be available from your water source.
Complete steps 1-6 of the START -UP procedure on page 9 using only the primary flow indicator on the front
panel of the Polymaster. Calculate the desired final solution percentage and set the post dilution flow indicator
to provide the balance of dilution water required.
It is recommended that both primary and post dilution flow indicators be set to approximately the same flow
rate unless the total water exceeds 2400gph in which case the maximum of 1200gph of water is added by the
primary dilution flow meter and the balance is added by the post dilution flow meter.
The post dilution flow control valve is positioned at the top of the internal flowmeter. The Polymaster should
produce double the desired final solution and then process down to the desired final concentration.
EXAMPLE: If you need 2400 gph of a 0.5% solution, set the Polymaster to produce 1200 gph on the primary
dilution meter and l200gph of water on the secondary dilution water meter. The Gat1in will produce 1%
solution with the primary 1200gph of water and 12gph of neat polymer. The introduction of the secondary
1200gph of post dilution water will result in a total of 2400gph of a 0.5% final solution.
If a model PAD/PMD-3000 unit has been purchased and it is determined that less than 1200gph of total
solution is required, then all of the dilution water should pass through the primary mixing circuit and the
secondary dilution water meter should not be used. This will ensure the maximum velocity of the final
solution through the static mixer.