Graco ProMix 239738 User manual

308740
Rev. C
Supersedes B
First choice when
quality counts.
Certified to CAN/CSA
22.2 No. E79–11–95
Conforms to ANSI/UL
standard 2279
Recognized Component
EExia II A T4
98D.123384
Intrinsically Safe for Hazardous Locations
Class I; Division 1; Group D*
*If an external power supply is connected to the control, the
control is no longer intrinsically safe and the control, as well
as the power supply, must not be operated in hazardous loca-
tions.
If a printer is connected to the control, Printer Barrier Kit
240652 must be installed to maintain intrinsic safety. If the
printer is installed without the Printer Barrier Kit, the control is
no longer intrinsically safe and the control and printer must
not be installed or operated in hazardous locations.
D
7465A
INSTRUCTIONS-PARTS LIST
INSTRUCTIONS
This manual contains important
warnings and information.
READ AND KEEP FOR REFERENCE.
ProMixProportioning System
For proportional mixing of plural component coatings
See page 3 for the model numbers and descriptions.
GRACO INC. P.O. BOX 1441 MINNEAPOLIS, MN 55440–1441
http://www.graco.com
COPYRIGHT 1997, GRACO INC.
Graco Inc. is registered to I.S. EN ISO 9001
Parts
Contents

2 308740
Symbols
Warning Symbol
WARNING
This symbol alerts you to the possibility of serious
injury or death if you do not follow the instructions.
Caution Symbol
CAUTION
This symbol alerts you to the possibility of damage to
or destruction of equipment if you do not follow the
instructions.
Table of Contents
Symbols 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ProMix Models 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Warning 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ProMix Proportioner Overview 6. . . . . . . . . . . . . . . . .
Installation 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Location 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Setup 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operator Controls 12. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pressure Relief Procedure 12. . . . . . . . . . . . . . . . . . . .
Startup 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reporting 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Shutdown 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Purging 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Purging the ProMix of Mixed Material 17. . . . . . . . . . . .
Purging the Fluid Supply 18. . . . . . . . . . . . . . . . . . . . . . .
Ratio Check 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Alarm Troubleshooting 23. . . . . . . . . . . . . . . . . . . . . . . . .
Instruction Manuals 23. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Part No. 239736 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Part No. 239737 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Part No. 239738 28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Part No. 239739 30. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fluid Lines 28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Accessories 33. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Dimensions 34. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Technical Data 35. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Graco Standard Warranty 36. . . . . . . . . . . . . . . . . . . . .
Graco Phone Number 36. . . . . . . . . . . . . . . . . . . . . . . .

308740 3
ProMix Models
WARNING
COMPONENT RUPTURE HAZARD
To avoid component rupture and serious injury, including injection, do not exceed the maximum
working pressure of the system components.
The maximum working fluid pressures below are based on the component A and B pump outputs at 100 psi
incoming air pressure. The solvent supply line inside the control has a 3000 psi (21 MPa, 207 bar) maximum
working fluid pressure, so the fluid supply for solvent purging must not exceed 3000 psi (21 MPa, 207 bar)
maximum working pressure.
Medium Pressure Models
ProMixMaximum Working Maximum Working Includes:
ProMix
Part No.
g
Fluid Pressure
g
Air Pressure Pump
Part No.
Quantity Description
239738 3000 psi
(21 MPa, 207 bar)
100 psi
(0.7 MPa, 7 bar)
223843 2 30:1 Ratio President
Pumps for supplying
plural components
239739 3000 psi
(21 MPa, 207 bar)
100 psi
(0.7 MPa, 7 bar)
223843 2 30:1 Ratio President
Pumps for supplying
plural components
223596 1 23:1 Ratio Monark
Pump for supplying
solvent
High Pressure Models
ProMixMaximum Working Maximum Working Includes:
ProMix
Part No.
g
Fluid Pressure
g
Air Pressure Pump
Part No.
Quantity Description
239736 4000 psi
(28 MPa, 276 bar)
with 239954 High
Pressure Spring Kit
100 psi
(0.7 MPa, 7 bar)
239140 2 46:1 Ratio President
Pumps for supplying
plural components
239737 4000 psi
(28 MPa, 276 bar)
with 239954 High
100 psi
(0.7 MPa, 7 bar)
239140 2 46:1 Ratio President
Pumps for supplying
plural components
g
Pressure Spring Kit 223596 1 23:1 Ratio Monark
Pump for supplying
solvent

4 308740
WARNING
INJECTION HAZARD
Spray from the gun, hose leaks, or ruptured components can inject fluid into your body and cause
extremely serious injury, including the need for amputation. Splashing fluid in the eyes or on the skin
can also cause serious injury.
Fluid injected into the skin might look like just a cut, but it is a serious injury. Get immediate medi-
cal attention.
Do not point the spray gun at anyone or at any part of the body.
Do not put hand or fingers over the spray tip.
Do not stop or deflect fluid leaks with your hand, body, glove, or rag.
Follow the Pressure Relief Procedure on page 12 whenever you: are instructed to relieve pres-
sure; stop spraying; clean, check, or service the equipment; or install or clean the spray tip.
Tighten all the fluid connections before operating the equipment.
Check the hoses, tubes, and couplings daily. Replace worn, damaged, or loose parts immediately.
Permanently coupled hoses cannot be repaired; replace the entire hose.
FIRE, EXPLOSION, AND ELECTRIC SHOCK HAZARD
Improper grounding, poor air ventilation, open flames, or sparks can cause a hazardous condition and
result in fire or explosion and serious injury.
Ground the equipment and the object being sprayed. See “Ground the System”on page 11.
The ProMix control is intrinsically safe when used without any external electrical components
connected to it. If an external power supply or printer is connected to the control, the control is no
longer intrinsically safe and the control, as well as the power supply and printer, must not be oper-
ated in hazardous locations, as defined in article 500 of the National Electrical Code (USA) or your
local electrical code.
If using an external power supply, do not exceed the +24 volts maximum applied voltage. Discon-
nect electrical power at the main switch before servicing the equipment.
Turn off the air to the air driven power supply before servicing the equipment.
Provide fresh air ventilation to avoid the buildup of flammable vapors from solvent or the fluid being
sprayed.
Extinguish all the open flames or pilot lights in the spray area.
Keep the spray area free of debris, including solvent, rags, and gasoline.
Do not turn on or off any light switch in the spray area while operating or if fumes are present.
Do not smoke in the spray area.
Do not operate a gasoline engine in the spray area.
If there is any static sparking while using the equipment, stop spraying immediately. Identify and
correct the problem.
Keep liquids away from the electrical components.

308740 5
WARNING
INSTRUCTIONS
EQUIPMENT MISUSE HAZARD
Equipment misuse can cause the equipment to rupture, malfunction, or start unexpectedly and result
in serious injury.
This equipment is for professional use only.
Read all instruction manuals, tags, and labels before operating the equipment.
Use the equipment only for its intended purpose. If you are uncertain about usage, call your Graco
distributor.
Do not alter or modify this equipment. Use only genuine Graco parts and accessories.
Check the equipment daily. Repair or replace worn or damaged parts immediately.
Do not exceed the maximum working pressure of the system components. See the instruction
manuals of the individual system components for their maximum working pressures. See page 3
for the maximum working pressures of your ProMix model.
Route the hoses away from the traffic areas, sharp edges, moving parts, and hot surfaces. Do not
expose Graco hoses to temperatures above 180F (82C) or below –40F (–40C).
Use only Graco approved hoses. Do not remove hose spring guards, which help protect the hose
from rupture caused by kinks or bends near the couplings.
Do not use the hoses to pull the equipment.
Use fluids or solvents that are compatible with the equipment wetted parts. See the Technical
Data section of all the equipment manuals. Read the fluid and solvent manufacturer’s warnings.
Comply with all applicable local, state and national fire, electrical and other safety regulations.
TOXIC FLUID HAZARD
Hazardous fluids or toxic fumes can cause serious injury or death if splashed in the eyes or on the
skin, swallowed, or inhaled.
Know the specific hazards of the fluid you are using. Read the fluid manufacturer’s warnings.
Store hazardous fluid in an approved container. Dispose of hazardous fluid according to all local,
state and national guidelines.
Wear the appropriate protective clothing, gloves, eyewear, and respirator.

6 308740
ProMix Proportioner Overview
Fig. 1
16
69
C
D
E
F
G
9
9
10
11
18
18
28
43
15
16
7466A
7475A
28
28
ProMix with solvent pump shown
(Part No. 239737 or 239739)
KEY
C ProMix Fluid Section
D Mix Manifold
E Keypad
F LED Display
G Operator Station
9 Plural Component Supply Pump
10 Solvent Supply Pump
11 Air Regulator
15 Air Filter
16 Air Shutoff Valve
18 Fluid Regulator
28 Fluid Drain Valve
43 Fluid Filter (one out of three pointed out)
69 ProMix Control

308740 7
Installation
NOTE:
Reference numbers and letters in parentheses in
this text refer to the numbers and letters in the
illustrations.
Icons in the text refer to the icons on the equip-
ment, keypad, or reference card.
Be sure all accessories are adequately sized and
pressure-rated to meet the system requirements.
For maintenance and safety, you must have a ball
valve between each fluid supply line and the ProMix
system.
See page 34 for dimensions.
CAUTION
The ProMix pot life timer will not function properly
when used with multiple guns that are operating
simultaneously. To avoid having mixed material set in
the equipment, carefully monitor the pot life by some
other means.
Location
WARNING
FIRE AND EXPLOSION HAZARD
The ProMix control is intrinsically safe
when used without any external electri-
cal components connected to it. If an
external power supply or printer is
connected to the control, the control is
no longer intrinsically safe and the
control, as well as the power supply and printer,
must not be operated in hazardous locations, as
defined in article 500 of the National Electrical
Code (USA) or your local electrical code.
If moving the ProMix with a forklift, be sure to tie the
unit securely to the forklift before lifting it. An optional
Caster Kit is available.
Setup
1. Remove the front panels from the ProMix control
(69) and the fluid section (C).
2. Tighten the fluid line connections between the flow
meter, mix manifold, and other system compo-
nents as they may have loosened during shipment.
3. Connect the ProMix control (69) to the fluid section
(C). See Fig. 2.
a. Place the brackets (6) into the slots in the
ProMix fluid section (C). Loosely install the
control bracket set screws (47).
b. Connect the ProMix control (69) to the brack-
ets (6) with the screws (74).
c. Tighten the screws (41) to make the fluid
section and control sides flush. Tighten the set
screws (47) for further adjustment.
NOTE: If you choose to mount the control on a
wall, rather than connecting it to the fluid section,
make sure the mounting surface can support the
weight of the control and any hoses and accesso-
ries connected to it and any stress that may be
applied during operation. See the control manual
308783 for mounting dimensions.
d. Install the beaker tray (I) with the two screws
(included), and place the beakers (H) in the
tray.
Fig. 2
69
C
6
KEY
C Fluid Section
H Beaker
I Beaker Tray
6 Control Bracket
69 ProMix Control
74 Screw
H
6
I
7467A
74
41
47

8 308740
Installation
4. Connect the supply lines from the fluid section to
the ProMix control connectors. See Fig. 3.
WARNING
COMPONENT RUPTURE HAZARD
To avoid component rupture and serious
injury, including injection, the fluid supply
unit for solvent purging must not exceed
3000 psi (21 MPa, 207 bar) maximum working fluid
pressure. See page 3 for additional maximum
working pressure information.
a. Connect the component A (resin) line from the
pump to control connector A.
b. Connect the component B (catalyst) line from
the pump to control connector B.
c. Connect the solvent line from the pump or
other solvent supply to control connector S.
d. Connect the air lines to the two control air
connectors .
NOTE:
The Control Air line supplies the air to the control
solenoids and air driven power supply and to the
spray gun.
The Manifold Purge Air line supplies the air for the
mix manifold solvent/air purge sequence.
5. Screw the air filter (15) into the Pump/Purge air
inlet. See Fig. 4.
NOTE: This air inlet is for the air supply to the two
plural component pumps and the manifold for air
purging.
6. Screw the shutoff valve (16-1) into the air filter (15).
7. Screw the second shutoff valve (16-2) into the
Control/Gun air inlet.
NOTE: This air inlet is for the air supply to the
solenoids and air driven power supply and to the
spray gun.
Fig. 3
KEY
A Component A Inlet
B Component B Inlet
S Solvent Inlet
Control Air
Manifold Purge Air
7469A
Fig. 4
15
16-1
16-2
KEY
15 Air Filter
16-1 Shutoff Valve for Pump/Purge Air
16-2 Shutoff Valve for Control/Gun Air
7470A

308740 9
Installation
8. Connect the air supply lines (J) to the two shutoff
valves (16). See Fig. 5.
9. Connect the fluid supply lines (K) to the pump fluid
inlets (L). See Fig. 5.
a. Connect the component A line to the compo-
nent A pump.
b. Connect the component B line to the compo-
nent B pump.
c. Connect the solvent line to the solvent pump
or other solvent supply.
10. Connect fluid and air supply lines to the spray gun.
See Fig. 5 and 7.
a. Connect the gun fluid supply line (N) between
the manifold’s static mixer outlet (P) and the
gun fluid inlet.
b. Connect the gun air supply line (M) between
the ProMix gun air outlet (O ) and the gun
air inlet.
NOTE: Install an air shutoff valve in the gun air
supply line or at the gun air inlet.
WARNING
FIRE AND EXPLOSION HAZARD
To reduce the risk of fire and explosion,
an automatic shutoff valve must be
properly installed in the gun air line if using a Graco
electrostatic PROGun.
Contact your Graco representative for information
on air shutoff valves for electrostatic applications.
11. Plug the operator station (G) into the connector
(Q ) on the ProMix control, using the 50 ft. cable
supplied. See Fig. 5 and 7.
Mount the operator station in an area where the
operator can easily access it.
Fig. 5
KEY
G Operator Station
J Air Supply Line
K Pump Fluid Supply Line
L Pump Fluid Inlet
M Gun Air Supply Line
N Gun Fluid Supply Line
O Gun Air Outlet
P Manifold Static Mixer
Outlet
Q Operator Station Con-
nector
16 Shutoff Valve
K
L
M
N
O
P
J16
7471A
G
Q

10 308740
Installation
WARNING
FIRE AND EXPLOSION HAZARD
The ProMix control is intrinsically safe
when used without any external electri-
cal components connected to it. If an
external power supply or printer is
connected to the control, the control is
no longer intrinsically safe and the
control, as well as the power supply and printer,
must not be operated in hazardous locations, as
defined in article 500 of the National Electrical
Code (USA) or your local electrical code.
12. If using a printer, plug the printer cable into the
printer cable connector on the ProMix control.
See Fig. 7.
13. If the external power option is used instead of the
air driven power supply (R) inside the control,
disconnect the wire harness from the power supply
connector (S). See Fig. 6.
Plug the power cable into the external power
connector . See Fig. 7. Use a 12–18 Vdc, 0.3
amp power supply. Do not exceed the +24 volts
maximum applied voltage.
14. If the alarm option is used, connect an air line
between the alarm air outlet on the control and
the air inlet on the alarm. See Fig. 7.
Fig. 6
R
S
7682A
KEY
R Air Driven Power Supply
S Power Supply Connector
Fig. 7
KEY
Gun Air Outlet
Air Signal Outlet (optional)
Alarm Air Outlet (optional)
Operator Station Connec-
tor
Printer Cable Connector
External Power Connector
P Manifold Static Mixer Outlet
7472A
P

308740 11
Installation
15. Ground the system. See Fig. 8.
WARNING
FIRE, EXPLOSION, AND ELECTRIC
SHOCK HAZARD
To reduce the risk of fire, explosion, or
electric shock, the system must be
properly grounded. Follow the Fire,
Explosion, and Electric Shock Hazard
warnings on page 4 and follow the
instructions below.
a. Connect the ground wire (T) supplied to the
ProMix ground lug (50). See Fig. 8. Connect
the ground wire clamp to a true earth ground
as defined in your local code.
b. A ground wire (U) is connected to a ground lug
inside the ProMix fluid section. See Fig. 9.
Connect the other end of the ground wire to
the ProMix control ground lug (50).
c. Ground the other system components as
instructed in their separate instruction manu-
als.
d. Use only grounded air and fluid hoses.
e. Ground the fluid supply container according to
your local code.
f. Ground the object being sprayed according to
your local code.
g. Ground the solvent pails according to your
local code. Use only metal pails, which are
conductive, placed on a grounded surface. Do
not place the pail on a nonconductive surface,
such as paper or cardboard, which interrupts
the grounding continuity.
h. Maintain grounding continuity when purging or
relieving pressure. Follow the instructions in
your separate gun manual for safely grounding
your gun while purging.
16. Check grounding continuity.
Have a qualified electrician check the resistance
between each ProMix component and the true
earth ground. The resistance must be less than 25
ohms. If the resistance is greater than 25 ohms, a
different ground site may be required. Do not
operate the system until the problem is corrected.
Fig. 8
KEY
T Ground Wire with Clamp
50 Ground Lug
50
T
7473A
Fig. 9
KEY
U Ground Wire
50 Ground Lug
50
U
7468A

12 308740
Operator Controls
Two devices provide operator interface; they are the
Operator Station, located in the spray booth, and the
Keypad, located on the control.
The operator station has four functions, represented by
four icons on its cover. See Fig. 10.
See the control manual 308783 for additional informa-
tion on using the Operator Station and the Keypad for
setup and operation. The keypad icons are also
explained in manual 308783.
7475A
Report
Standby
Purge
Mix
Fig. 10
Pressure Relief Procedure
WARNING
INJECTION HAZARD
The system pressure must be manually
relieved to prevent the system from
starting or spraying accidentally. Fluid
under high pressure can be injected through the
skin and cause serious injury. To reduce the risk of
an injury from injection, splashing fluid, or moving
parts, follow the Pressure Relief Procedure
whenever you:
are instructed to relieve the pressure,
stop spraying,
check or service any of the system equipment,
install or clean the spray tip.
1. Set the operator switch to standby . See Fig.
10.
16-
1
2. Close the Pump/Purge air
shutoff valve (16-1).
7512A
Air Shutoff Valve
3. Shut off the air at the spray gun.
VV
4. Place waste containers under each of the pump
drain valves (V) and open the drain valves to
relieve fluid pressure at the pumps.
7485A
5. Set the operator switch to mix .
6. Hold a metal part of the
spray gun firmly to the side
of a grounded metal pail,
and trigger the gun to
relieve fluid pressure.
ÄÄÄ
ÄÄÄ
ÄÄÄ
7. Set the operator switch to standby .
8. If you suspect that the spray tip or hose is com-
pletely clogged or that pressure has not been fully
relieved after following the steps above, very
slowly loosen the hose end coupling and relieve
pressure gradually, then loosen the coupling
completely. Now clear the tip or hose obstruction.
9. Close the pump drain valves before spraying
again.

308740 13
Startup
CAUTION
The ProMix pot life timer will not function properly
when used with multiple guns that are operating
simultaneously. To avoid having mixed material set in
the equipment, carefully monitor the pot life by some
other means.
NOTE: If the ratio is set to 0.6:1 to 20:1, the ratio will
remain at its setting when powered off and on. If the
ratio is set to 0.5:1 or less and the system is powered
off and on, the ratio will reset to the default of 1:1. All
other settings will also reset to their default.
1. Make sure the operator switch is set
at standby to avoid mixing or purging
material at startup.
7475A
2. Check that the supply containers for component A
and B and solvent are filled.
3. Check that the mix manifold fluid shutoff knobs,
dispense valve knobs, and purge valve knobs are
set as follows:
(W) Fluid Shutoff Knobs: fully open
(X) Dispense Valve Knobs: three “clicks”open
from fully closed setting
(Y) Purge Valve Knobs: two turns open from fully
closed setting
(Z) Ratio Check Valve Knobs: fully closed
7384B
X
Y
W
Reference
W
Z
16-1
16-2
4. Turn the air supply on and
open the air shutoff valves
(16-1,16-2).
A diagnostic test will run
and the last known Target
Ratio will display on the
LED panel. This will be a
1.0:1 ratio on the initial
startup. 7474
A
Target Ratio
5. If this is the first startup of the system, purge it as
instructed in Purging the Fluid Supply on page
18. The system was tested with light-weight oil,
which should be flushed out to avoid contaminating
the fluid you will spray.
6. You can check the tolerance, pot life time, and
other operation status information by pressing the
proper key on the keypad. See the control manual
308783 for the meaning of the icons on the key-
pad.
7. Setup the ratio and other values as needed. See
control manual 308783 for setup information.
8. Make sure the operator switch is set
at standby.
7475A

14 308740
Startup
9. Check that the component pump air regulator
(11-2) is properly set for your application. Do not
exceed the 100 psi (0.7 MPa, 7 bar) maximum
working air pressure of the pump.
7478A
11-2
10. Check that the fluid valves are open and the fluid
pressure regulators (18-1,18-2)are properly set for
your application. Do not exceed the maximum fluid
working pressure of your system components.
18-118-27485A
Air Shutoff Valve
11. Shut off the air at the spray gun.
12. Prime the system.
CAUTION
Do not use the first 4 to 5 oz. (120 to 150 ml) of
material from the system, as it may not be thor-
oughly mixed due to alarms while priming the sys-
tem.
NOTE: If the flow meters overrun because of air in the
system, operation will stop. See control manual
308783 for alarm troubleshooting information.
a. Touch the token (on the back of the reference
card) to the setup contacts (AA). Number 1
appears on the display, indicating the control is
at level 1 setup.
Setup Level
AA
b. Refer to the reference card, and press the
return key 〈↵) on the keypad twice to move to
level 3 setup.
c. 3 appears on the display, indicating that the
system is at level 3 setup, and the light under
the first icon lights up.
d. Refer to the reference card and
hold down the component A valve
key to open the component A
valve.
ÄÄÄ
ÄÄÄ
e. Trigger the gun into
a grounded waste
container until com-
ponent A flows from
the gun.

308740 15
Startup
f. Release the component A valve key to
close the valve.
g. Hold down the component B
valve key to open the component
B valve. Trigger the gun into a
grounded waste container until
component B flows from the gun.
h. Release the component B valve key to
close the valve.
13. Clear the lines of unmixed material by purging with
solvent.
a. Press the return key 〈↵) to move to level 1
setup.
b. Adjust the solvent pump air pressure regulator
(11) or other solvent supply regulator. Use the
lowest pressure possible to avoid splashing.
11
7478A
c. Hold down the solvent valve key to open
the solvent valve.
d. Trigger the gun into a grounded waste con-
tainer until solvent flows from the nozzle.
e. Release the solvent valve key to close the
valve.
f. Touch the token to the setup contacts to exit
setup mode.
14. Prime the lines with mixed material.
a. Turn the operator switch to mix.
7476A
b. Trigger the gun into a grounded waste con-
tainer until mixed material flows from the
nozzle.
c. Turn the operator switch to
standby.
7475A

16 308740
Startup
15. Spray
Air Shutoff Valve
a. Open the gun air shutoff valve.
b. Turn the operator switch to mix.
c. Spray the material as instructed in your spray
gun manual.
d. If the fluid output is too low, increase the air
pressure to the component supply pumps or
increase the regulated fluid pressure.
If the fluid output is too high, reduce the air
pressure, close the manifold dispense valves
further, or adjust the fluid pressure regulator.
NOTE: The pressure adjustments of each component
will vary with the viscosity. In general, start with the
same feed pressures for component A and B and then
adjust as needed.
CAUTION
Never allow the fluid supply tanks to empty com-
pletely while the ProMix is operating. Fill them
periodically, as needed. Failure to fill the tanks when
they are low may allow air or off-ratio material into
the fluid lines, causing an alarm condition and stop-
ping production.
Reporting
Report Button
7475A
If a printer is connected to the ProMix
control, set the operator switch to
standby and press the report button to
generate a report.
NOTE: The system must be in standby
mode to run a report.
The control will reset the component A and B totalizers
and send the following information to the printer:
Start Date and Time
End Date and Time
Consumption A
Consumption B
Desired Ratio
Ratio Tolerance
Maximum Ratio Deviation
Shutdown
WARNING
INJECTION HAZARD
To reduce the risk of a serious injury,
follow the Pressure Relief Procedure
on page 12 whenever you:
are instructed to relieve the pressure,
stop spraying,
check or service any of the system equipment,
install or clean the spray tip.
Stop production at any time by setting the operator
switch to standby. If your stop time will not exceed the
pot life, no additional action is needed, except to
relieve the system pressure. If your stop time will
exceed the pot life, you must purge the mixing system.
See Purging the ProMix of Mixed Material, page 17.
NOTE: If the ratio is set to 0.6:1 to 20:1, the ratio will
remain at its setting when powered off and on. If the
ratio is set to 0.5:1 or less and the system is powered
off and on, the ratio will reset to the default of 1:1. All
other settings will also reset to their default values.

308740 17
Purging
There are two purging procedures: one for purging the
ProMix control of mixed materials, and one for purging
the fluid supply system.
Purging the ProMix of Mixed Material
Follow the procedure below:
After a ratio check,
Before any break or service procedure that
exceeds the pot life of the fluid,
Before servicing the control assembly.
NOTE: In general, the ratio check valves only need to
be purged after a ratio check. To purge the ratio check
valves, see page 22.
WARNING
INJECTION HAZARD
To reduce the risk of a serious injury,
follow the Pressure Relief Procedure
on page 12 whenever you are instructed
to relieve the pressure.
1. Make sure the solvent is compatible with the
equipment wetted parts and with the fluid being
sprayed.
2. Make sure the operator switch is set
at standby.
7475A
WARNING
FIRE, EXPLOSION, AND ELECTRIC
SHOCK HAZARD
To reduce the risk of fire, explosion, or
electric shock, the air to the gun must be
shut off on a Graco PROelectrostatic
spray gun to ensure the electrostatic
power is not on when purging.
Air Shutoff Valve
3. Shut off the air at the spray gun.
4. If you are using a high pressure gun*, relieve the
pressure as instructed on page 12, and remove
the spray tip before purging the system. Clean the
tip separately.
16-1
16-2
5. Turn the air supply on and
open the air shutoff valves
(16-1, 16-2).
7474A
6. Adjust the solvent pump air pressure regulator (11)
or other solvent supply regulator. Use the lowest
pressure possible to avoid splashing.
11
7478A
7. Turn the operator switch from
standby to purge.
7477A
* A gun is considered high pressure when its maximum working pressure is 900 psi [6.2 MPa, 62 bar] or greater.

18 308740
Purging
8. Trigger the gun into a
grounded waste container.
The control will run, alter-
nating solvent and air,
until the set purge time is
over.
ÄÄÄ
ÄÄÄ
If the fluid section is not clean after completing the
purge sequence, repeat the purge by turning the
operator switch to standby and back to purge. If
the purge time is repeatably too short, change to
setup mode and lengthen the purge time.
9. Turn the operator switch to standby.
7475A
10. Relieve the pressure as instructed on page 12.
Purging the Fluid Supply
Follow the procedure below:
During initial startup,
Before changing colors,
At the end of each workday,
Before servicing the system if possible or after
servicing if production will not resume right away.
WARNING
INJECTION HAZARD
To reduce the risk of a serious injury,
follow the Pressure Relief Procedure
on page 12 whenever you are instructed
to relieve the pressure.
1. Make sure the solvent is compatible with the
equipment wetted parts and with the fluid being
sprayed.
2. Make sure the operator switch is set
at standby.
7475A
WARNING
FIRE, EXPLOSION, AND ELECTRIC
SHOCK HAZARD
To reduce the risk of fire, explosion, or
electric shock, the air to the gun must be
shut off on a Graco PROelectrostatic
spray gun to ensure the electrostatic
power is not on when purging.
Air Shutoff Valve
3. Shut off the air at the spray gun.
4. Relieve the pressure as instructed on page 12.
5. Disconnect the component A and B fluid supply
lines, and connect regulated solvent supply lines in
their place.
AB7485A

308740 19
Purging
16-1
6. Turn the air supply on and
open the air shutoff valves
(16-1, 16-2).
16-2 7474A
7. Touch the token to the setup contacts (AA). Num-
ber 1 appears on the display, indicating the control
is at level 1 setup.
Setup Level
AA
8. Refer to the reference card, and press the return
key 〈↵) on the keypad twice to move to level 3
setup.
9. 3 appears on the display, indicating that the sys-
tem is at level 3 setup, and the light under the first
icon lights up.
10. Refer to the reference card and hold
down the component A valve key to
open the component A valve.
11. Trigger the gun into a grounded waste container
until the component A fluid lines are clean.
ÄÄÄ
ÄÄÄ
12. Release the component A valve key to close
the valve.
13. Hold down the component B valve
key to open the component B valve.
Trigger the gun into a grounded
waste container until the component
B fluid lines are clean.
14. Release the component B valve key to close
the valve.
15. If changing colors/materials, change the ratio and
other values as needed.
16. Touch the token to the setup contacts to save any
new values that were entered and exit setup
mode.
17. Relieve the pressure as instructed on page 12.
18. Disconnect the solvent supply lines, and reconnect
the component A and B fluid supply lines.
19. See page 13 for startup procedure.

20 308740
Ratio Check
Check the ratio at least once per month, as part of a
regular maintenance routine, and anytime a flow meter
is changed.
WARNING
PRESSURIZED EQUIPMENT HAZARD
To avoid splashing fluid in the eyes when
performing a ratio check or purging:
Wear eye protection.
Only open the ratio check valves enough to
allow fluid to flow at a rate of 100 to 200 cc per
minute.
CAUTION
The fluid shutoff valves and ratio check valves are
retained in their housings by mechanical stops that
prevent accidental removal of the valve stem while
the manifold is pressurized. If manual force cannot
turn the valve stems, the system pressure must be
relieved and the valve properly disassembled and
cleaned to remove the resistance.
Reference
W
Z
KEY
W Fluid Shutoff Knobs
Z Ratio Check Valve Knobs
W
7384B
1. Make sure the operator switch is set
at standby.
7475A
2. Turn off all the spray or dispense devices con-
nected to the ProMix.
3. Close both fluid shutoff valves (W) and ratio check
valves (Z) by turning the knobs in.
7480
A
H
4. Make sure the two bea-
kers (H) and the ratio
dispense tubes are in
place.
NOTE: Use 5/32”
I.D. tubing for the
ratio dispense tubes.
5. Touch the token to the setup contacts. 1 appears
on the display, indicating the control is at level 1
setup. The last known target ratio will also display.
Target RatioSetup Level