8 308060
Operation
e. Close the outlet (W) and return valves (K) for
the tank being used and open the outlet and
return valves for the other tank.
f. Start the pump and circulate the solvent for at
least one hour.
g. While circulating, open the spray gun at each
drop and flush the hoses with about one gallon
(4 liters) of solvent.
5. When flushing is complete
a. Stop the pump and drain all solvent from the
tanks and lines.
b. Open the filter drain valves (R) to flush out all
filtered residue.
c. Thoroughly blow out the entire system with
clean, dry compressed air, or nitrogen, to
remove all solvent from the system.
6. Pumping paint
a. Fill a tank with paint and start the agitator (C).
b. Start the pump.
c. Use the filter isolation valve (Q) to control the
pump flow to 50 psi (3.5 bar) until the lines are
full, and then open the valve completely.
d. Circulate the paint until all air is removed from
the fluid lines.
e. While the paint is circulating, check and adjust
the viscosity as necessary.
7. Filling standby tank
a. Fill the other mix tank (standby tank) with paint
and start the agitator.
b. Leave the agitator running so that paint in the
standby tank will be ready for use when need-
ed.
c. To keep air out of the system, always switch to
the standby tank before the paint supply in the
tank you have been using is completely
exhausted.
8. Flushing paint from system
Consult the paint supplier for a compatible solvent for
flushing paint from the system. Water reducible paints
should use de-ionized water and a solvent which will
keep resin in the solution. If water reducible paint has
a 20% solvent content, the flush media should also
contain approximately 20% solvent.
CAUTION
Do not flush the pump with any acid, caustic or
abrasive flush solution (line stripper) of any type. The
pump is designed to circulate automotive paint
coatings only.
CAUTION
De-ionized (D.I.) water is an agressive, corrosive
material. It can be used on the wateborne versions of
the Imperial Pumps. Exposure of all other Imperial
Pumps to D.I. water should be minimized, and the
D.I. water should be flushed from the pump with a
non-corrosive material such as alcohol.
Adjusting System Pressure
Use the back pressure valve (F) to adjust the system
pressure.
Determine the line pressure required. Then, with paint
circulating in the line loop only, set the back pressure
valve so that the pressure at the last spray gun is 10
psi (0.7 bar) greater than needed.
Refer to the Typical Installation on page 4 and the
separate back pressure valve instructions.
CAUTION
The pump is set at the factory to deliver the maxi-
mum volume and outlet pressure. The pressure
cannot be increased by any adjustment of the pump.
Refer to Pump Thrust Bearing and Seal Replace-
ment, page 12, for proper adjustments.
