Graco ProMix II Service And Parts page 21

Replacing Air Flow or Pressure
Switch
The air flow switch (702) detects whether there is
atomizing air flow to the gun (gun is triggered).
The pressure switch (717) detects if a gun is in the
gun flush box with the box door closed.
1.
Follow Preparation
off power at main circuit breaker.
2.
Air Flow Switch (702): Disconnect wires from
connector (V). F . 17.
IG
Pressure Switch (717): Disconnect wires from
switch, noting their connection points. F
3.
Air Flow Switch (702): Unscrew nut from fitting
(704a), and remove assembly from enclosure.
Remove fittings from air flow switch (702).
Pressure Switch (717): Unscrew bushing (716)
from fitting (704b). Remove bushing from pressure
switch (717).
4.
Apply pipe thread sealant to new air flow or
pressure switch threads and install.
5.
Reconnect wires that were disconnected in step 2.
Switch wires are not polarized.
6.
Reassemble Smart Fluid Panel
Replacing Solenoids
The Smart Fluid Panel has a minimum of 4 solenoids. If
you have a color change valve option installed, you have
additional (optional) solenoids for each additional color.
Refer to Pneumatic Diagram, page 30.
To replace a single solenoid.
1.
Follow Preparation
off power at main circuit breaker.
2.
Disconnect 2 solenoid wires (N) from control board
(706). F . 17.
IG
3.
Unscrew 2 screws (P) and remove solenoid (712).
310653B
procedure, page 19, and shut
. 17.
IG
(page 22).
procedure, page 19, and shut
Solenoid Actuates
Standard
1 Dispense Valve A
2 Dispense Valve B
3 Air Purge Valve A
4 Solvent Purge Valve B
Optional
5 Gun Flush Box Pilot Valve
6 Color Change Solvent Valve
7 Color Change Valve 1
8 Color Change Valve 2
9 Color Change Valve 3
10 Color Change Valve 4
11 Color Change Valve 5
12 Color Change Valve 6
716 717
704b
702
704a
6
P 5
4
3
2
1
712
F . 17
IG
4.
Install new solenoid (712).
5.
Connect 2 wires (N) to control board (706).
Solenoid wires are polarized (red +, black –). Refer
to ProMix™ II Electrical
6.
Reassemble Smart Fluid Panel
Service ◆ Smart Fluid Panel
706
V
12
11
10
N
9
8
7
TI4875
Schematic, page 31.
(page 22).
21