Graco Hydra-Cat 207-388 F, Instructions And Parts List

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I N S T A L L A T I O N
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For assistance in setting up a plural component system,
you should contact Fluid Systems, 9451 West
Belmont, Chicago, Illinois 60121-2891,
This will help ensure that you select the proper type and
size of equipment for your job.
All inlet connections on this mixer have
threads.
Use an air regulator to control the mixer motor speed.
Install a bleed-type master air valve on the air line to
shut off and relieve air to the mixer motor.
Start and prime the solvent pump and check the
flushing system before connecting the material hoses.
ASSEMBLY
O P E R A T I O N
Determine Motor Air Pressure Setting
Pull the actuating lever (29) back to close the inlet
valves. Then refer to the separate operating instructions
for your proportioning pump, and start the system.
Set the air pressure to the mixer motor at about 30 psi
(2.5 bar). Place a small waste container under the mixer
outlet (A). Open the air valve to start the mixer motor,
then open the material inlet valves. When the container
is full, close the valves.
Increase the air pressure slightly and dispense another
sample. Repeat this procedure five or six times, record-
ing the air pressure setting for each sample. Place
another waste container under the mixer outlet, start
the mixer motor, and open the solvent valve. When
clean solvent comes form the outlet, close and the sol-
vent valve then stop the mixer motor.
Let all samples “cure”, or harden, completely. Examine
each one for proper cure. Select the sample which
cured properly at the lowest air pressure and use that
pressure for the mixer air supply. Repeat the test if none
of the samples cured properly.
CAUTION
Always use the lowest possible air pressure as this
produces the least amount. of heat created by fric-
tion of the mixing shaft the motor.
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Determine Material Pot Life
To test the pot life, use a cup with approximately the
same shape and size as the mixing assembly chamber; 1
cubic inch for Model 207389, or 2.1 cubic inch for
Model 207-390. Start the mixer motor and open the
material valves to fill the container. Close the material
valves and starting timing the reaction.
Flush the mixing chamber with solvent to remove the
mixer material.
When the material starts to gel, check how long the
reaction has taken. This is the operating pot life of your
material. Reduce that time by at least 10% to determine
how long your system can remain idle without flushing
or dispensing material. For example, if the pot life is 11
minutes, then 9 minutes is the maximum time that mix-
ed material should be left in the mixing chamber and
hoses before dispensing or flushing.
NOTE:
If the material pot life is 10 minutes or less,
use the Automatic Power Mixer.