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Prime Empty Sprayer
3A0420H 23
Recirculate or Re-Prime After a
Pump Runs Dry
Without Heat
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 Sprayer, page 21.
2. Close the dual shutoff handle (AE).
3. Ensure the recirculation hoses (U) are in the correct
hoppers (J).
4. Open the circulation valve handle (AC).
5. Turn down the air pressure regulator (CB) and then
open the main air shutoff valve (CA). Use the air
pressure regulator to slowly increase the air pres-
sure to the pumps until they start running slowly.
6. If the pumps are running too quickly, adjust the main
air regulator (CB) to regulate the cycle rate.
7. Run the pumps for a few minutes or until the mate-
rial has reached the desired temperature. See Heat
Fluid.
8. Close the main air shutoff valve (CA).
9. See Spray, page 24.
With Heat
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.
Heat Fluid
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 outlet
temperature to match the spray temperature.
NOTE: 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 tempera-
ture.
NOTE: Agitate, recirculate, and heat the material
only as necessary to avoid mixing air into the fluid.
AC
AE
r_571101_3A0420A_9a-2
U
J
CB
CA
CA
r_571100_3A0420A_11a-1