Operation - Graco A Series Instructions-Parts List Manual

I. Pressure relief procedure
WARNING
The system remains pressurized until pressure is
manually relieved. To reduce the risk of serious
injury from pressurized fluid, accidental spray from
the gun or splashing of any fluid, follow this proce-
dure whenever you:
are instructed to relieve pressure;
stop spraying;
check or service any system equipment;
install, clean or change spray nozzles.
1. Be sure the pump air regulator (5a) is still open.
Close the master air valve (A) to relieve pump air
pressure.
2. Turn the ES On/Off valve lever to OFF.
3. Trigger the spray gun to relieve fluid pressure.
4. Open the fluid recirculating valve (35) to relieve all
fluid pressure.
II. Flush the pump before the first use
Flush with a solvent compatible to your fluid. Consult
the fluid manufacturer's literature for recommenda-
tions. See Flushing on page 12.
KEY
A Bleed-Type master air valve
C Air supply line
5a Pump air regulator
5b Gun air regulator
6 Fluid regulator
10 1/4" female quick disconnect coupler
35 Recirculating ball valve
14 Air cap
35 Recirculation ball valve
Fig. 9

Operation

III. Prime the system (Fig. 9)
1. Place the pump on a grounded metal pail of pre-
pared fluid. Tighten the thumbscrews lightly.
2. Close the gun air regulator (5b) and the fluid
regulator (6).
3. Open the recirculating valve (35).
4. Connect the air line (C) to the pump.
5. Open the master air valves (A).
6. Trigger the gun into a waste pail to release any
trapped pressure.
7. Slowly raise the pump air regulator (5a) pressure
to 20–30 psi (140–210 kPa, 1.4–2.1 bar). The
pump will cycle quickly until it is primed. When it is
primed, close the recirculating valve (35); the
pump will stall against pressure. If not, reopen the
recirculating valve for 30 seconds and then close.
Now set the pump air pressure to 40 psi (280 kPa,
2.8 bar).
8. Hold the gun against and aimed into a grounded
metal waste pail. Trigger the gun and slowly open
the fluid regulator (6). The gun will emit air until the
fluid arrives. When fluid flows freely, release the
gun trigger.
A
5b
10
5a
C
6
35