Graco ProMix 3KS, Installation Manual

Page: 18 / 44

Fluid Supply
18 313881C
Fluid Supply
Requirements
ProMix models are available to operate air spray or
air-assisted systems with a capacity of up to 3800
cc/min.
• Fluid supply pressure tanks, feed pumps, or circulat-
ing systems can be used.
• Materials can be transferred from their original con-
tainers or from a central paint recirculating line.
• For an airless system, the user must supply a gun
trigger signal to the ProMix 3KS.
• See manual 313599 for Coriolis meter installation
and operation instructions.
NOTE: The fluid supply must be free of pressure spikes,
which are commonly caused by pump stroke change-
over. If necessary, install pressure regulators or a surge
tank on the ProMix fluid inlets to reduce pulsation. Con-
tact your Graco distributor for additional information.
Fluid Connections
1. Connect the solvent supply lines.
a. Connect the solvent supply line to the 1/4 npt(f)
solvent purge valve inlet. See F
IG
. 7.
b. Multiple color system: also connect a solvent
supply line to the color change stack (Q), top
valve 4 or 5. See F
IG
. 8.
NOTE: Solvent supplied by a single source can cause
cross contamination and damage to the system. Install
check valves or use separate solvent sources.
2. Connect the component C supply line(s).

Single component C system: connect
component supply line to the component C
flow meter inlet.

Multiple component C system: connect
component C supply lines to the color
change valve stack (S) inlets. See F
IG
. 8.
The color number is marked on the valve air
supply line.
NOTE: Paint Recirculating System Only
• The color change valves have two fluid
ports for each individual valve. If you are
recirculating paint, plumb the valves in one
port and out the other.
• Another option is to use a tee fitting to recir-
culate.
3. Connect the 6 ft (1.83 m) fluid line (supplied) from
the 2KS fluid manifold static mixer outlet to the 3KS
fluid manifold inlet. See F
IG
. 7.
NOTE: The fluid meter inlets have fluid check valves to
prevent backflow from fluid supply pressure fluctuations.
Backflow can cause ratio inaccuracies.
4. Connect the gun fluid supply line between the 3KS
fluid manifold static mixer outlet and the gun fluid
inlet.
Do not exceed the pressure rating of the lowest rated
component. See the identification label (F
IG
. 1 on page
4).
To reduce the risk of injury, including fluid injection, you
must install a shutoff valve between each fluid supply
line and the fluid manifold assembly. Use the valves to
shut off fluid during maintenance and service.
NOTICE
Verify that all unused fluid ports on the color change
valve stack are plugged before operation. An open
port will leak fluid.