Operation
12
3A8109A
Table 1: Baseline Chemical Dosage Settings
Flow rate and time settings are approximate, as every
installation will vary due to external factors. Graco
recommends using the On/Off settings on this chart as a
starting point and using a calibration column to fine tune
the flow output. Adjust the On time slightly up or down to
fine tune the injection flow rate.
Pressure
(PSI)
Flow Rate
1 QPD
(0.25 GPD)
(0.9 LPD)
2 QPD
(0.5 GPD)
(1.9 LPD)
3 QPD
(0.75 GPD)
(2.8 LPD)
4 QPD
(1 GPD)
(3.8 LPD)
8 QPD
(2 GPD)
(7.8 LPD)
12 QPD
(3 GPD)
(11.4)
ON
(sec)
OFF
(sec)
ON
(sec)
OFF
(sec)
ON
(sec)
OFF
(sec)
ON
(sec)
OFF
(sec)
ON
(sec)
OFF
(sec)
ON
(sec)
OFF
(sec)
0
0.3
300
0.5
239
0.7
239
0.2
60
0.5
59
0.7
59
500
0.4
300
0.5
179
0.7
179
0.3
60
0.6
59
1.0
59
1000
0.4
240
0.6
179
0.9
179
0.4
60
0.8
59
1.2
59
1500
0.4
180
0.7
179
1.1
179
0.5
59
1.0
59
1.5
58
2000
0.5
179
0.9
179
0.9
119
0.6
59
1.2
59
1.8
58
Pressure
(PSI)
Flow Rate
16 QPD
(4 GPD)
(15.1 LPD)
20 QPD
(5 GPD)
(18.9 LPD)
24 QPD
(6 GPD)
(22.7 LPD)
28 QPD
(7 GPD)
(26.5 LPD)
32 QPD
(8 GPD)
(30. 3 LPD)
ON
(sec)
OFF
(sec)
ON
(sec)
OFF
(sec)
ON
(sec)
OFF
(sec)
ON
(sec)
OFF
(sec)
ON
(sec)
OFF
(sec)
0
0.9
59
1.2
59
1.4
59
1.6
58
1.9
58
500
1.3
58
1.6
58
1.9
58
2.2
58
2.5
57
1000
1.6
58
2.0
58
2.4
58
2.8
57
3.2
57
1500
2.0
58
2.4
58
2.9
57
3.4
57
3.9
56
2000
2.3
58
2.9
57
3.5
56
4.0
56
4.7
55
