17
307–934
Operation
9. Clean the tip guard and spray tip separately, then
reinstall them.
10. Clean the inside and outside of the pail or suction
tube.
Flush with a fluid that is compatible with the fluid you
are pumping and with the wetted parts in your system.
Check with your fluid manufacturer or supplier for
recommended flushing fluids and flushing frequency.
Starting and Adjusting the Pump
Refer to figures 3 and 4.
Be sure the air regulators and bleed–type master air
valve are closed.
DO NOT INSTALL THE SPRAY TIP
YET!
Place the suction tube (23) in the fluid pail. Open the
bleed–type master air valve and the gun air regulator.
Hold a metal part of the spray gun firmly to the side of
a grounded metal pail and trigger the gun. Slowly open
the pump air regulator until the pump starts. Allow the
pump to cycle slowly until all the air is pushed out of
the fluid lines. Release the gun trigger and engage the
safety latch; the pump will stall against the pressure.
With the pump and lines primed, and with adequate air
pressure and volume supplied, the pump will start and
stop as the spray gun is triggered and released.
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure
on page 16.
Relieve the pressure,
then install the spray tip in gun.
Use the pump air regulator to control the pump speed
and fluid pressure. Always use the lowest pressure
necessary to achieve the desired results. Higher
pressures waste fluid and cause premature wear of the
pump packings and spray tip.
The fluid regulator (51f) used on pump model 231–075
is a fluid pressure type. It allows you to run the pump
at an “efficient” air pressure (above 210 kPa [2.1 bar,
30 psi] ) while adjusting fluid pressure with the regula-
tor. The back pressure regulator (40, see figure 4)
used on model 222–294 does the same by requiring a
minimum flow rate and also setting the minimum
circulating rate needed to prevent fluid from settling.
Keep the wet–cup filled with Graco Throat Seal Liquid
(TSL) to help prolong the packing life. Check the
tightness of the packing nut weekly. The packing nut
should be tight enough to prevent leakage – no tighter.
Always follow the
Pressure Relief Procedure Warn-
ing
on page 16 before adjusting the packing nut.
Never allow the pump to run dry of the fluid being
pumped. A dry pump will quickly accelerate to a high
speed, possibly damaging itself. If your pump acceler-
ates quickly, or is running too fast, stop it immediately
and check the fluid supply. If the supply container is
empty and air has been pumped into the lines, refill the
supply container and prime the pump and lines with
fluid, being sure to eliminate all air from the fluid sys-
tem, or flush the pump as described in “Shutdown and
Care”, on this page.
Heated Systems
Operating instructions for a heated circulating system
are provided in the Viscon
Heater manual, 307–805.
Read and understand all warnings and instructions in
the heater manual before operating a heated system.
The three–way ball valve (37) can be set for either fluid
circulation or draining. To circulate fluid back to the
pump, turn the handle toward the CIRC end of the
valve. To drain fluid, turn the handle toward the DRAIN
end.
Shutdown and Care of the Pump
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure
on page 16.
For overnight shutdown, stop the pump at the bottom
of its stroke to prevent fluid from drying on the ex-
posed displacement rod and damaging the throat
packings.
Relieve the pressure.
Always flush the pump before the fluid dries on the
displacement rod. See
Flushing
on page16.
Summary of Contents for Ratio President Hydra-Spray 222-294
Page 26: ...26 307 934 NOTES...
