Graco 223-599 Instructions Manual page 21

REPLACING THE PRESSURE CONTROL & CIRCUIT BOARD
WARNING
To reduce the risk of serious bodily injury, including
fluid injection or splashing in the eyes or on the skin,
or injury from moving parts, always follow the Pres-
sure Relief Procedure W arning on page 14 be-
fore checking, adjusting, cleaning or shutting off the
sprayer. Unplug the power supply cord.
NOTE: A circuit board (23f) is not included with a new
pressure control (50). However, it is included with
a new motor, and it can be ordered separately.
Be sure to order the correct circuit board. See the
application information on page 24.
CAUTION
Do not allow the fittings (A) to move when removing
the elbow (312) or nipple (313) from the pressure
control, to avoid altering the factory setting of the
pressure control or permanently damaging the
pressure control.
Circuit Board Removal
1. Remove the pressure control cover (41). Pull the
board (23f) out carefully, just enough to reach the wire
terminals. Disconnect the leads. Remove the board.
See Fig 21.
Pressure Control Removal
2. Disconnect the hose (52) from the nipple (302). See
Fig 20.
3. Disconnect the motor leads. See Fig 21.
4. Remove the screws (7), lockwashers (4), and nuts
(3). See Fig 20 .
5. Pull the pressure control (50) away from the conduit
while carefully guiding the leads through the connec-
tor (303 ) one at a time. See Fig 21.
6. Remove the mounting bracket (40). Remvoe the fit-
tings (302, 312, and 313). Install these parts on the
new pressure control. See Fig 20.
7. Guide the motor leads into the new pressure control.
Circuit Board Installation
8. Position the circuit board in the control so the wire
connectors are at the top. Connect the leads to the
board. Guide the leads into the pressure control,
making sure they don't catch on anything. Slide the
board into place.
Pressure Control Installation
9. Connect any other loose wires. See Fig 21.
10. Mount the pressure control on the frame.
11. Adjust the pressure control. See page 22.
WARNING
Adjust the pressure control whenever a new or used
pressure control or circuit board is installed, to re-
duce the risk of overpressurization which can result
in component rupture, fire or explosion. Improper
adjustment may also prevent the sprayer from ob-
taining the maximum working pressure, resulting in
poor sprayer performance.
47
3
4
312
302
Fig 20
130
TRIAC
LEADS
WHITE
RED
WHITE
50
41
Fig 21
84
25
40
50
A
313
52
7
23
MOTOR
BLACK LEADS
GREEN &
YELLOW
1
RED
PINK
BROWN
303
23c
23f
GREEN
BLACK
WHITE
POWER SUPPLY
CORD LEADS