Graco PrecisionMix ii, Instructions And Parts List

Page: 20 / 260

2–10
Overview
Changing the Mixing Order
The order in which the three components are mixed
depends on the characteristics of the materials being
used. In the standard configuration, Component A is
mixed with Component C first, then the blend of A and
C is mixed with Component B. The instructions in this
manual correspond with this mixing order.
To convert the PrecisionMix II 3K to a configuration
where Component A is mixed with Component B
before Component C is added, perform the following
steps.
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 4–3.
1. Flush the system and relief the pressure.
2. Refer to Fig. 2.5. Unscrew the nut of the Compo-
nent C tube (T) from the nipple at the dispense
valve (V).
3. Remove the screws (S) and take the Component
C meter (U), bracket, and tube off the fluid panel.
4. Unscrew the nut of the Component B tube (W)
from the nipple at the dispense valve (Y).
5. Remove the screws (S) and take the Component
B meter (Z), bracket, and tube off the fluid panel.
6. Turn the tubes of both meters 180 so the nuts
face in the opposite direction.
7. Reinstall the Component B and C meters, in the
opposite locations.
8. Refer to Fig. 2.6. Disconnect the red air lines (R)
from the elbows at the Component B and C dis-
pense valves and reconnect them to the opposite
dispense valve. Switch the green air lines (G) in
the same way.
9. Refer to Fig. 2.6. Disconnect the red air lines (R)
from the elbows at the Component B and C purge
valves and reconnect them to the opposite purge
valve. Switch the green air lines (G) in the same
way.
10. Using Part No. 196303 Label, relabel dispense
valve B to C and dispense valve C to B.
11. Reverse the wires on terminals 4271 and 4291.
Refer to Fig. 3.21, page 3–29.
Fig. 2.5
TI0223
T
S
S
V
U
W
Y
Z
U
Z
S
S
V
T
W
Y
Affix Label B Here
Affix Label C Here
Disassembly Reassembly