Graco XP-h, Instructions Manual

Page: 28 / 70

Spray
28 3A0420V
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.
Spray
NOTE: After the first day of spraying follow Pres-
sure Relief Procedure, page 24, and tighten the
throat packing nuts on both pumps.
1. If heaters are used, turn them on. To adjust the
heater temperature, refer to the Viscon HP manual
for instructions, and the
Heat Fluid section, page
28. Circulate as necessary.
2. Close the circulation handle (AC) and the solvent
flush valve (AD). Open the dual shutoff handle (AE).
3. Adjust the main air regulator (CB) to 30 psi
(0.21 MPa, 2.1 bar).
4. Remove tip. Disengage the trigger lock and trigger
the gun into a grounded metal pail. Use a metal pail
lid with a hole to dispense through to avoid splash-
ing. Dispense out of the mix hose until a well mixed
coating flows from the gun.
5. Engage the trigger lock. Install the tip on the gun.
6. Adjust the main pump air regulator (CB) to the nec-
essary spraying pressure and apply a coating to a
test panel.
NOTE: Run system verification tests everyday. See
page 34.
7. Excess pressure increases overspray and pump
wear.
8. Check and record gauge readings frequently during
operation. A change in gauge readings indicates a
change in system performance.
NOTE:
• A pressure drop occurs during pump stroke
changeover. It should be quick and synchro-
nous.
• Flush the mix manifold as necessary during the
day’s operation.
9. Follow Flush Mixed Material , page 30 when you
are finished spraying or before potlife expires.
NOTE: Mixed material potlife or working time
decreases with increased temperature. Pot life in
the hose is much shorter than the dry time of the
coating.
Wear gloves when using flush solvents and/or if fluid
temperature exceeds 110°F (43°C).
AC
AE
AD
TI1950a TI1953a
TI1949a