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Prime Empty System
3A0420T 25
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 23.
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. Run the pumps for a few minutes or until the mate-
rial has reached the desired temperature. See Heat
Fluid.
7. Close the main air shutoff valve (CA).
8. See Spray, page 26.
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 out-
let 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.
AC
AE
r_571101_3A0420A_9a-2
U
J
CB
CA
CA
r_571100_3A0420A_11a-1