With Heat; Heat Fluid - Graco XM Series Operation

Recirculate
11. Close recirculation valves (AC, AD).
AC
12. See Spray, page 33.
NOTE: If you circulate the A side pump at pressures
greater than 3000 psi (21 MPa, 210 bar), an advisory is
issued and the yellow LED on the display illuminates.
This is a reminder to select Spray mode prior to
spraying and to circulate at a lower pressure to avoid
excessive pump wear.
If you circulate the A side pump above 5200 psi (35.4
MPa, 354 bar), an alarm shuts the pump down to
prevent accidentally spraying material while still in
circulation mode.
32

With Heat

Using recirculation mode when heating the material is
required. Note the temperature at the top of the heater
(outgoing or back to hopper). When the thermometer
and display reach operating temperature, the material is
ready to spray.
AD

Heat Fluid

To heat fluid evenly throughout the system:
1. Circulate fluid at approximately 1 gpm (10-20
cycles/min.) to raise temperature of hoppers to
80-90° F (27-32° C).
2. Decrease circulation rate to approximately 0.25 gpm
(5 cycles/min.) to increase the heater outlet
temperature to match the spray temperature.
NOTE: Circulating 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.
NOTE: Agitate, recirculate, and heat material only as
necessary to avoid mixing air into the fluid.
312359M