Pressure Relief Procedure - Graco PGM Instructions - Parts Manual

Pressure Relief Procedure

Pressure Relief Procedure
Follow the Pressure Relief Procedure whenever
you see this symbol.
This equipment stays pressurized until pressure is
manually relieved. To help prevent serious injury from
pressurized fluid, such as skin injection, follow the
Pressure Relief Procedure when you stop dispens-
ing and before cleaning, checking, or servicing the
equipment.
1. Shut off the fluid supply to the PGM inlet block.
2. If equipped, place a waste container beneath the
fluid drain valve under the filter.
3. Place a waste container beneath the dispense
valve.
4. Slowly open the drain valve at each fluid filter to
relieve fluid pressure. Close valve when pressure
gauge reads zero.
5. Navigate to the Maintenance screen. See Screen
Navigation Diagram on page 82 in the Appendix
A - User Interface Display section.
26
6. Perform the following steps to perform a low flow
dispense:
a. From the Mode drop-down menu, select Bead
mode.
b. Enter the minimum flow rate for your system.
For example, 12 cc/min or 40 cc/min depending
on the size of the gear meter.
c. Press
control enclosure to begin the low flow dis-
pense.
d. Continue to dispense until the inlet pressure on
the PGM is near zero.
e. Visually locate the plug installed at the back of
the inlet block.
f. Place a container under the plug and slowly
remove the plug to relieve remaining inlet pres-
sure.
7. In maintenance mode, select Open Dispense Valve
Control mode
the dispense valve. Press the manual dispense but-
ton until fluid flow stops.
or the Purge button on the
, which opens
3A5185B