Pressure Control Assembly Calibration; Zero Calibration - AIRLESSCO SL1100 Operation And Repair Manual

Pressure Control Assembly Calibration

NOTE: Anytime a sensor or pressure control assembly
(board) or both are replaced, the following calibrations
must be performed.
NOTE: Pressure control assemblies (boards) are now
being equipped with a green grounding wire attached.
Connect the grounding wire to terminal box using the
same screw that holds the grounding wire from the
power cord.

Zero Calibration

1. Place prime/pressure relief valve in the prime (open)
position.
2. Set the pressure control knob to the minimum set-
ting (CCW).
3. Remove the screws and lower the pressure control
assembly.
4. Remove any jumper on the "P-ZR" terminal.
NOTE: This jumper is no longer used.
5. Turn machine "ON" and ensure it is not cycling.
6. If the yellow light on the electrical board is ON and
you have "0000" on the LCD display, the Zero Cali-
bration is complete no further adjustment is neces-
sary. If the light is ON and there are numbers on the
display, use an insulated screwdriver to turn the
"ZERO" trimpot counter-clockwise until the light
goes out. Then turn it clockwise until the yellow light
comes on, continue to turn the trimpot and the num-
bers will reduce until the LCD shows "0000". The
Zero Calibration is now complete. If you adjust
beyond "0000". The Zero Calibration is now com-
plete. If you adjust beyond "0000" the numbers will
start to increase.
If the digital display shows "---" and no yellow light,
you should turn the Zero trimpot clockwise until the
yellow light is on, continue turning until "0000" is
shown.
The goal is to see the "0000" on the digital display,
this is when you have Zero Calibration (Relying on
the yellow light is no longer used.)
3A1184A
Pressure Calibration
1. Complete the ZERO calibration, as per "ZERO CAL-
IBRATION" prior to commencing this calibration.
2. Attach a 50', 1/4" airless hose, airless gun with
0.017 tip and a 5000 psi glycerin filled pressure
gauge to pump.
3. Place the suction tube into a bucket of Pump Condi-
tioner and water.
4. Turn prime/pressure relief valve to the prime (open)
position.
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.
LCD Display Calibration
If so equipped
1. Complete the "ZERO CALIBRATION" and "PRES-
SURE CALIBRATION" procedures prior to com-
mencing this calibration.
2. Turn pressure control knob up until system pressure
is above 2500 psi (as indicated on the glycerin filled
pressure gauge) and the machine is not cycling.
3. Use an insulated screwdriver to adjust the Set trim-
pot. Turn trimpot CCW until it clicks, then adjust to
match pressure against pressure gauge reading.
4. Move the pressure control knob to different settings
and trigger the gun several times to ensure that the
LCD continues to match the pressure gauge read-
ing.
Maintenance
17