Recirculate Prior To Spraying Or Re-Prime After A Pump Runs Dry - Graco XP-hf 572407 Instructions Manual

Prime Empty System
Recirculate Prior to Spraying or
Re-Prime After a Pump Runs Dry
NOTE: Agitate, recirculate, and heat the material only
as necessary to avoid mixing air into the fluid.
Use the recirculation mode when heating the material is
required. Note the temperature at the top of the heater
(outgoing or back to the hopper). When the thermome-
ter reaches operating temperature, the material is ready
to spray.
If using a system that does not require heat, recircula-
tion is still required prior to spraying. Recirculation
ensures that any settled fillers are mixed in, the pump
lines are fully primed, and the pump check valves are
operating smoothly.
Recirculation also allows you to re-prime one side that
has run dry.
1. Follow Prime Empty System, page 27.
2. Lift to close the dual shutoff handle (AE).
AC
(open)
AE
(closed)
3. Ensure the recirculation lines (U) are in the correct
hoppers (J).
J
4. Lower to open the recirculation valve handle (AC).
30
5. Turn down the air pressure regulator (CB) and then
open the motor air shutoff valve (CA). Use the air
pressure regulator to slowly increase the air
pressure to the pumps to 15-30 psi (1-2 bar) until
they start running slowly.
CB
6. Run the pumps for a few minutes or until the
material has reached the desired temperature. See
Heat Fluid, page 30.
7. Close the motor air shutoff valve (CA).
Heat Fluid
U
To heat fluid evenly throughout the system:
1. Circulate the fluid at approximately 1/2 gpm
(10-20 cycles/min.) to raise the temperature of the
hoppers to 80-90 °F (27-32 °C).
2. Decrease the circulation rate to approximately
0.25 gpm (5 cycles/min.) to increase the heater
AC outlet temperature to match the spray temperature.
Circulating the fluid too quickly without decreasing the
circulation rate will increase only the hopper
temperature. Similarly, circulating fluid too slowly will
increase only the heater outlet temperature.
CA
B
A
CA
NOTICE
3A4381M