Graco 278680, Instructions Manual, Page: 22 / 28

Pressure Control Transducer
22 332257A
Pressure Control Transducer
Removal
1. Perform Pressure Relief Procedure , page 8.
Unplug power cord.
2. Remove screws (12) and cover (51).
3. Disconnect transducer lead from motor control
board (48).
4. Remove two screws (47) and remove filter housing.
Pull transducer to the right to remove from control
box housing (48).
5. Remove pressure control transducer (38) and o-ring
(3) from filter housing (15).
Installation
1. Install o-ring (3) and pressure transducer (38) into
filter housing (15). Torque to 50 - 58 ft-lb.
2. Thread transducer lead plastic connector through
transducer grommet (20) and slide grommet into
slot in control box housing (48).
3. Install filter housing (15) with screws (47).
Torque to 17 N•m.
4. Connect transducer lead (J11) to motor control
board (48).
5. Install cover (51) with screws (12).
Torque to 3.4 - 4.0 N•m.
Pressure Adjust Potentiometer
Removal
1. Perform Pressure Relief Procedure , page 8.
Unplug power cord.
2. Remove screws (12) from cover (51).
3. Disconnect potentiometer lead from motor control
board (48).
4. Remove potentiometer knob (11), o-ring (129), nut
(37a) and pressure adjust potentiometer (37).
Installation
1. Install pressure adjust potentiometer (37) and nut
(37a).
a. Turn potentiometer fully clockwise.
b. Install knob (11) at full clockwise position.
2. Connect potentiometer lead (J12) to motor control
board (48). See
Wiring Diagram , page 24.
3. Install cover (51) with screws (12). Torque to 3.4 -
4.0 N•m.
SmartControl
The SmartControl contains stored data to assist with
troubleshooting and maintenance. To view this stored
data on the digital display:
1. Perform Pressure Relief Procedure , page 8.
2. Plug in sprayer.
3. Hold down display button and turn sprayer ON.
4. Release display button about 1 second after turning
on sprayer. Sprayer model number displays for a
few seconds and then data point 1 is displayed.
5. Push display button and next data point displays.
6. Turn sprayer OFF and then ON to exit stored data
mode.
Data Point Definition
1 Serial Number of sprayer.
2 Number of hours motor has been running.
3 Last error code. Press and hold display button to clear error code to E=00
4 Software revision