Operation; Purge System - Graco Therm-O-Flow 20 Instructions - Parts Manual

Operation

Operation
1. Turn the Main Power Switch ON. The Graco logo
will display until communication and initialization is
complete.
2. Press the button. Verify the machine is in
"Warm Up" state, and that the temperatures are
increasing. Allow the system to reach the "Ready"
state before pumping. The Pump will automatically
turn on, if autostart is enabled in setup screens,
when all the heat zones reach their setpoint
temperature.

Purge System

NOTICE
Purge the system before initial use and when
chemicals are changed to prevent material
contamination, which may cause the material to fail
or perform poorly. The system was factory- tested
using a light soluble oil, a soybean oil, or some other
oil as tagged. Flush the system to avoid
contaminating the material that has been designated
for initial material loading.
28
NOTICE
Use fluids that are chemically compatible with the
equipment wetted parts. See Technical
Specifications in all of the equipment manuals.
1. Select the material for the initial material load.
2. Verify whether the factory-test oil and the initial
material load are compatible:
a. If the two substances are compatible omit the
remaining steps in this procedure and refer to
Load Material, page 29.
b. If the two substances are incompatible perform
the remaining steps in this procedure to flush
the system.
3. Select a pail of material that can eliminate the
factory-test oil from the system. If necessary, check
with Graco or the material supplier for a
recommended solvent.
4. Before purging, be sure the entire system and
waste pail are properly grounded. See Grounding,
page 20.
5. Turn all heat zones' setpoint temperature to the
material manufacturer's recommended dispense
temperature, or a minimum of 100°F (37°C)
minimum.
NOTE: Remove any dispense valve orifices before
purging. Reinstall after purging has been completed.
6. Purge the material through the system for
approximately 1 to 2 minutes.
7. Remove the pail if purge material was used. See
Change Pail, page 37.
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