Purging The System - Graco Therm-O-Flow 20 Instructions - Parts Manual

Installation

Purging the System

Purging the system before the initial use can prevent
material contamination, which may cause the material to
fail or perform poorly.
CAUTION
Purge the system before performing the initial material
loading procedure. 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.
To purge the system perform the following procedure:
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
the start up and operation instructions.
b. If the two substances are incompatible perform
the remaining steps in this procedure to flush
the system at ambient temperature.
Use fluids that are chemically compatible with the
equipment wetted parts. See the Technical Data sec-
tions of all the equipment manuals.
This equipment should not be used with more than one
type of fluid due to potential compatibility issues which
could result in an unpredictable reaction. Graco recom-
mends using new hoses when chemicals are changed
or care must be taken to assure that all traces of one
chemical are removed before introducing a second
chemical.
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3. Select a pail of material that can eliminate the fac-
tory-test oil from the system. If necessary, check
with Graco or the material supplier for a recom-
mended solvent.
4. Before purging be sure the entire system and waste
pail are properly grounded. Refer to Grounding on
page 14.
5. Turn all heat zones to 70°F (21.1°C). This allows air
to the air motor, with no alarms, in a cold state. Heat
soak must = 0 or you will need to wait for the preset
time to elapse (default is 45 minutes).
Remove any dispense valve orifices before purg-
ing. Reinstall after purging has been completed.
6. Purge the material through the system for approxi-
mately 1 to 2 minutes.
7. Remove the pail if purge material was used.
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