Pressure Control Assembly - AIRLESSCO LP 2400 Operation Manual And Parts List

PRESSURE CONTROL ASSEMBLY (PCA)
Note: Anytime a sensor, pressure control assembly (board) or both are replaced,
1. ZERO CALIBRATION
1. Place prime/pressure relief valve in the prime (open) position.
2. Set the presssure control knob to the minimum setting (CCW).
3. Remove the screws (Fig. 17, Item 24) and lower the pressure control assembly. Ensure PCA is grounded.
4. Ensure the jumper (Fig. 10, Item 9) is on the "P-ZR" terminal. Note: This jumper comes with a new pressure
control assembly (board) and is installed on the "P-ZR" terminals. If you are "Zero Calibrating" a pressure
control assembly presently in the unit, remove Jumper from Single Terminal P-ZR and place on both
terminals P-ZR. When Zero Calibration is complete replace jumper on a single terminal of P-ZR.
5. Turn machine "ON" and ensure it is not cycling.
6. If the yellow light on the electrical board is ON, use an insulated screwdriver to turn the "ZERO" trimpot
counter-clockwise until the light goes out. Then turn it clockwise until the light just comes back on.
7. If the yellow light is OFF, turn the "Zero" trimpot clockwise, just until the light comes on and stop.
NOTE: If the yellow light remains constantly "ON", or "OFF" during this calibration, the sensor is defective
and should be replaced.
8. When calibration is complete, move jumper from both "PZ-R" terminals to single terminal on P-ZR.
2. PRESSURE CALIBRATION
1. Attach a 50', 1/4" airless hose, airless gun with 0.017 tip and a 5000 psi glycerine filled pressure gauge to
the pump.
2. Place the suction tube into a bucket of Coro-chek and water.
3. Turn Prime/pressure relief valve to the prime (open) position.
4. Complete the ZERO calibration, as per "ZERO CALIBRATION".
5. Turn pressure control knob clockwise until machine starts to prime.
6. Place the prime/pressure relief valve in the pressure (closed) position.
7. While watching pressure gauge, slowly adjust the Pressure Trimpot (clockwise to increase and counter
clockwise to decrease) until the maximum static pressure is 3000 psi, with the pressure control knob fully
clockwise. Trigger the gun several times to ensure pressure returns to 3000 psi .
3. LOW PRESSURE VOLTAGE TRIMPOT CALIBRATION
1. Attach a 50', 1/4" airless hose, airless gun with .017 tip and a 5000 psi glycerine filled pressure gauge to the
pump.
2. Place the suction tube into a bucket of antifreeze (or Coro-chek) and water.
3. Turn pump ON and turn up pressure control until the machine starts to prime.
4. Place the prime/pressure relief valve in the pressure (closed) position.
5. Pressurize pump to 600 psi.
6. Trigger the gun several times noting the deadband (the amount of pressure drop before the pump rebuilds to
set pressure).
7. If deadband is greater than 100 psi, adjust the low pressure voltage trimpot so that the deadband is less than
100 psi and the pressure increase after the gun trigger is released is less than 200 psi. These pressures are
guidelines and may vary slightly from pump to pump.
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the following three calibrations must be performed.