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7309160
Operation and Maintenance
Pressure Relief Procedure
WARNING
SKIN INJECTION HAZARD
The system pressure must be manually
relieved to prevent the system from
starting or dispensing accidentally. Fluid
under high pressure can be injected through the
skin and cause serious injury. To reduce the risk of
an injury from injection, splashing fluid, or moving
parts, follow the Pressure Relief Procedure
whenever you:
S are instructed to relieve the pressure,
S stop dispensing,
S check or service any of the system equipment,
S or install a new or clean the dispense gun
tip/nozzle.
1. Lock the gun trigger safety.
2. Shut off the air to the supply pumps.
3. Turn off the power (air) to the proportioning pump.
4. Unlock the spray gun trigger safety.
5. Hold a metal part of the gun firmly to the side of a
grounded metal pail, then trigger the gun to relieve
pressure.
6. Lock the trigger safety again.
7. If you suspect that the dispense valve or hose is
completely clogged, or that pressure has not been
fully relieved after following the steps above, very
slowly loosen the tip retaining nut or hose end
coupling to relieve pressure gradually, then loosen
completely. Wear protective gloves to avoid skin
injection or burns. Now clear the tip/nozzle or
hose.
8. Be sure the fluid is cool before disconnecting the
hoses.
Operation
WARNING
This equipment should not be used with
more than one type of fluid due to poten-
tial compatibility issues which could
result in an unpredictable reaction.
Graco recommends 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.
CAUTION
S Do not pressurize hose until operating tempera-
ture has been reached.
S Operate at lowest possible temperature and
pressure necessary for application.
S Hose must be vented during startup and shut-
down.
S The dispense valve must be kept open over a
waste container while the system is heating up
and also when cooling down. This will prevent a
pressure build–up caused by fluids or gasses
expanding from the heat.
Refer to your system operation manual for complete
startup and operating instructions.
Maintenance
WARNING
SKIN INJECTION HAZARD
Do not mend or repair any part of a hose
assembly. If the hose is damaged,
replace it immediately to avoid serious
injury from fluid injection and electric shock.
If the hose is not heating, be sure the connector at the
hose control box is firmly plugged in. If that does not
correct the problem, relieve the fluid pressure in the
pump and hoses, as instructed at left. If the hose is
faulty or the problem not corrected, replace the hose.
See Troubleshooting on page 8 for electrical mea-
surements.