Graco ProMix II, Operating Manual

Page: 39 / 58

Operation
◆
Start Up
310633C 39
Start Up
1.
Go through Checklist,
Mix Manifold Valve Settings
To open dispense or purge valves, turn their hex nut (E) counterclockwise. To close, turn clockwise. F
IG
. 41.
✓
Checklist
System grounded
Verify all grounding connections were made. See
Grounding, page 23.
All connections tight and correct
Verify all electrical, fluid, air, and system connec-
tions are tight and installed according to Installa-
tion instructions, page 12.
Fluid supply containers filled
Check component A and B and solvent supply
containers.
Mix manifold valves set
Check that mix manifold valves are set correctly.
Start with the settings recommended in Mix Mani-
fold Valve Settings, below, then adjust as
needed.
Packing nuts on dispense and purge
valves correctly torqued
Use a 3/8” or 10 mm wrench to torque the dis-
pense and purge valves packing nuts (D) to 25
in-lbs (2.8 N•m). F
IG
. 41. Repeat this torque
weekly to extend valve life and avoid leakage.
Fluid supply valves open and pressure set
Component A and B fluid supply pressures should
be equal unless one component is more viscous
and requires a higher pressure setting.
Solenoid pressure set
75-100 psi inlet air supply (0.5-0.7 MPa, 5.2-7 bar)
Mix Manifold Valves
F
IG
. 41
4A
4B
1B
1A
2B
2A
3B 3A
D
Torque to 25 in-lbs
(2.8 N•m)
E
TI4608A
Valve Hex Nut (E) Setting Function
Dispense (3A, 3B) 1 turn out from fully closed Limits maximum fluid flow rate into integrator and
minimizes valve response time.
Purge (4A, 4B)
Fluid Shutoff (1A, 1B) Fully open during Run/Mix oper-
ation Closes component A and B ports to integrator during
ratio check or meter calibration. Open ports during
Run/Mix operation.
Sampling (2A, 2B) Fully closed during Run/Mix
operation Opens valves to dispense component A and B while
calibrating meters. Do not open sampling valves
unless fluid shutoff valves are closed.