Operation; Pressure Relief Procedure; Flush The Pump Before First Use; Starting And Adjusting The Pump - Graco 24H316 Instructions Manual

Operation

Pressure Relief Procedure

Trapped air can cause the pump to cycle unexpectedly,
which could result in serious injury from accidental
spray from the gun, splashing fluid, or moving parts.
Follow the Pressure Relief Procedure whenever you:
• are instructed to relieve the pressure,
• stop spraying,
• check or service any of the system equipment,
• or install or clean the spray nozzle.
1. Close the red–handled bleed–type master air valve
(11h, required in your system). See F
page 9.
2. Place the drain hose (43) into a waste container.
Turn the 3–way recirculation valve (46) to the drain
position.
3. Trigger the gun at the last gun station to relieve fluid
pressure. Maintain firm metal–to–metal contact
between the gun and a grounded waste pail. Repeat
for all gun stations.
4. Open the drain valve (D) to relieve fluid pressure
which may be trapped in the pump or hose.
If you suspect that pressure is not fully relieved after fol-
lowing the steps above, wrap a fitting near the pump
outlet with a rag, and slowly and carefully loosen the fit-
ting to relieve pressure. Be careful to protect your eyes
from splashing.

Flush the Pump Before First Use

The pump is tested with water before shipment. If the
fluid you are using may be contaminated by the water,
flush it out with a compatible solvent. See Flushing on
page 14.
3A1318B

Starting and Adjusting the Pump

Refer to F
1. Open the fluid shutoff valves (14, 5).
2. Place the suction tube (if used) in the fluid to be
pumped.
NOTE: If the fluid inlet pressure to the pump is more
than 25% of the outlet working pressure, the ball check
valves will not close fast enough, resulting in inefficient
. 2 on
IG
pump operation.
3. Open the back pressure regulator (12). Turn the 3–
way recirculation valve (46) to the circulation posi-
tion.
4. Open the spray gun at the last gun station and keep
it open while starting the pump.
5. Open the bleed–type master air valves (11h, B).
6. Slowly open the air filter/regulator (11a) until the
pump starts. The air filter/regulator controls the
pump speed and fluid outlet pressure.
7. Adjust the fluid pressure to the lowest setting neces-
sary to get the desired results. Higher pressures
may not improve the spray pattern and will cause
premature component wear. Use the air filter/regu-
lator (11a) and the back pressure regulator (12) to
adjust the pump speed and fluid pressure until the
spray is completely atomized. Refer to the back
pressure valve manual (supplied) for adjustment
procedures.
8. To adjust the spray pattern, follow the complete
instructions in your gun manual.
. 3, page 35, and to F
IG IG
Operation
. 5, page 13.
11