ITW Dynatec c. 2004
DYNAMINI ASU Manual #20-25
Page 6-3
Revised 1/05
Flushing the System
Contaminated adhesive, accumulation of residue, or changing the adhesive formulation may require
the system to be flushed. At least 6 liters (1.5 gallons) of flushing fluid is required (PN L15653).
1. Pump out as much of the molten adhesive as possible.
2. Reduce the pump pressure to zero by first turning the pump switch to OFF. Then open the
purge screw, following the instructions given in “Purging the Filter Manifold of Adhesive
and Pressure” on page 6-2.
3. Disconnect one of the supply hoses’ adhesive feed from its applicator head. Do not
disconnect electrical power to the head. Put the hose in a secured position within a container
to catch the used flushing fluid.
4. Add flushing fluid to the hopper and allow approximately fifteen minutes for it to reach
hopper temperature. Carefully stir the flushing fluid to mix with any remaining adhesive.
5.
For Piston Pumps:
Slowly turn the air pressure regulator clockwise.
For Gear Pumps:
Slowly turn the pressure relief control valve clockwise.
6. Pump about half of the fluid into the container.
7.
For Piston Pumps:
Turn the regulator counter-clockwise.
For Gear Pumps:
Turn the motor OFF.
8. Remove the output filter and replace the basket. Install a new o-ring on the filter nut
(lubricate the new o-ring with o-ring lubricant prior to installation) and tighten the brass nut.
9. Add new adhesive to the hopper and heat to application temperature.
10.
For Piston Pumps:
Slowly turn the air pressure regulator clockwise.
For Gear Pumps:
Turn the motor ON.
11. Actuate each applicator until all flushing fluid is removed and a steady stream of new
adhesive flows.
12.
For Piston Pumps:
Re-adjust the pump air pressure for desired flow.
For Gear Pumps:
Re-adjust the pressure relief for desired flow.
13. Re-fill the hopper and resume production.
WARNING
The flushing fluid will splash easily. Wear protective clothing, gloves and
goggles to prevent severe burns.
Pressure
Relief Valve
Pressure
Regulator