Vacuum De-Gas - Graco HFR Setup And Operation Manual

Setup
n. For EP Gun and GX-16, perform a test pour into
a waste container. Adjust pressure and tem
perature to get desired results. Equipment is
ready to dispense.
o. For all dispense valves other than the EP Gun,
perform mix ratio test using two tared cups.
Weigh the cups and divide the weights to verify
the mix ratio by weight. See Ratio Checking
section in the dispense valve manual for more
information.
p. For Fusion dispense valves, perform DC Power
Pack Hydraulic Pressure Setup. See HFR
Repair manual for procedure.
q. Equipment is ready to dispense.
44

Vacuum De-gas

NOTE: This procedure is for assemblies with vacuum
tree manifold and no agitator or auto-refill.
1. Disable machine movement by pressing the
Machine Disable Mode key (
2. Close the shut-off ball valves at the base of the
tanks.
3. If the tank lid has a fill port, turn off any systems that
might refill the tank during the vacuum de-gas pro
cedure.
4. Close the fill port ball valve.
5. If the tank lid requires a desiccant dryer or nitrogen
pump installed, install one into the top ball valve of
the vacuum tree manifold.
6. Close the top ball valve of the vacuum tree mani
fold.
7. Attach vacuum pump to the bottom ball valve of the
vacuum tree manifold then open the ball valve.
8. Turn on the vacuum pump.
9. Continue to de-gas for sufficient time to de-gas the
material.
10. Close bottom ball valve of the vacuum tree mani
fold.
11. Turn off the vacuum pump.
12. Open the top ball valve of the vacuum tree manifold.
NOTICE
Operating the tank after the vacuum de-gas proce
dure without the top ball valve open will result in
pump cavitation, off-ratio conditions, and possible
collapse of the tank.
13. Open the shutoff valves at the base of the tanks.
).
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