Prime The Pump; Calibrate Chemical Dosage - Graco Python XL-DA25 Series Instructions And Parts

Operation

Prime the Pump

1. Verify all connections and fluid lines are tight.
NOTE: The pressure regulator (E) and inlet pneumatic
needle valve (B) both effect the pump cycle rate. After
inlet pressure is set, the needle valve can serve as a
speed control.
2. Adjust pneumatic regulator (E) to desired pressure.
3. Open bleed-type pneumatic valve (D). Slowly turn
pump needle valve (B) counter-clockwise, increas-
ing air/gas flow to the pump.
NOTICE
Pump runaway may occur if the needle valve (B) is
opened too far for pressure settings, causing damage
to the packing sets (102 and 107).
4. Keep the pump cycle rate less than 1 cycle every 3
seconds only while priming the pump.
12

Calibrate Chemical Dosage

1. Set the pump to an estimated setting of the flow
rate.
2. Follow the instructions provided with your calibration
gauge.
3. Adjust the cycle rate with the inlet pneumatic needle
valve (B) and/or the pressure regulator (E).
4. Repeat the steps 2 and 3 to verify your changes.
Repeat as necessary until the desired flow rate is
achieved.
Baseline Chemical Dosage Settings
See Performance Charts, starting on page 39, for max-
imum flows at any given pressure.
3/4 in. Fluid
Plunger Pumps Plunger Pumps
CPM
GPD LPD
10
180 680
20
359 1360
30
539 2041
40
719 2721
50
899 3401
60
1078 4081
NOTE: Maximum cycle rate is 60 CPM (cycles per min-
ute), and the minimum cycle rate is 10 CPM. All values
are at 0 psi back pressure. Cycle rates over 60 may
cause excess wear and premature seal failure.
1 in. Fluid
GPD LPD
269 1017
537 2033
806 3050
1074 4066
1343 5083
1611 6100
3A6831A