Graco LSR Select, Instructions Manual

Page: 19 / 112

Operation
3A2152B 19
Base Purge
1. Navigate to the AUTO MODE SETUP SCREEN.
2. Set the CATALYST PERCENT OF MIX to zero.
3. Set the INHIBITOR PERCENT OF MIX to 6%.
4. Press the footswitch and take about fifteen shots to
get the existing catalyst out of the mixer.
5. Verify the mix will not cure by wiping a small amount
of mixed material from the last shot on the heated
mold in the press and seeing if the material cures.
6. If the material cures, take some more shots, testing
the material until the material does not cure.
To start dispensing again after a base purge, go to the
AUTO MODE SETUP screen, set the catalyst back to
1% and begin dispensing. After the same amount of
shots that took to base purge, material with catalyst
should begin to dispense through the mixer. To verify
this, wipe a small amount of mixed material from the last
shot on the heated mold in the press and see if the
material cures.
Flushing Procedure
Flush out old fluid with new fluid or flush out old fluid
with a compatible solvent before introducing a new fluid.
All fluid components are compatible with common sol-
vents. Use only moisture-free solvents. See
Technical
Data on page 108 for a list of wetted components to ver-
ify compatibility of solvent with wetted materials. See
solvent manufacturer's information for material compati-
bility. Do not use water.
Ground the solvent pails used when flushing: Refer to
Ground the system. on page 13.
If flushing with a compatible solvent, perform the follow-
ing procedure:
1. Perform Shutdown , page 17.
2. Disconnect the valve stack from the screw located
on the press.
3. Disconnect the base pump inlet from the feed pump.
4. Connect the flushing hose into the base pump inlet.
5. Perform Startup , page 17.
6. Navigate to the DRIVE/VALVE CONTROL screen.
7. Press the SET IN MAN'L MODE button to put the
system in manual mode.
8. Push the base OPEN INLET VALVE, OPEN OUT-
LET VALVE, and OPEN SCREW VALVE buttons so
there is a clear path to flush.
9. Start flushing.
10. When the silicone is no longer dispensing from the
mixer, stop flushing.
NOTE: Even though flushing will get the majority of the
material out of the stack and mixer, disassemble the
blocks and mixer and clean these parts individually.
NOTICE
Mixed material with start to gel in the mixer if the
machine is idle for a prolonged periods of time,
causing machine damage. Perform a base purge as
required.
Flush equipment only in a well-ventilated area. Do
not dispense flammable fluids. Do not turn on heaters
while flushing with flammable solvents.