Model FF-2500 Proportioning Unit
22
25942-1, Issue 4
WARNING:
T
O PREVENT EXCESSIVE PRESSURE BUILD
-
UP IN THE HEATED HOSES
,
ALWAYS
BRING THE HOSES AND PRIMARY HEATER UP TO OPERATING TEMPERATURE BEFORE TURNING
ON THE PUMP SWITCH
.
12. Set the pump switch to NORMAL. One of the amber directional indicator lights
should be ON and the proportioning pumps should move a short distance and
pressurize.
NOTE
:
The standard size 40 pumps have
a material pressure to air pressure
ratio of approximately 25 to 1.
13. Set both pressure regulators as required. Always set the down stroke pressure
regulator first to the desired air pressure, then set the upstroke pressure regulator
approximately 10 psi lower to compensate for the pressure boost generated by
pressure feeding material into the pumps.
14. Connect air to the gun. Consult the gun operating manual and test dispense as per
the directions.
15. Observe the iso and resin pressure gauges on both the up and down strokes.
Readjust the upstroke pressure regulator as required so that the proportioning pump
pressure is equal on both the up and down strokes.
The proportioning unit is now ready for operation.
Daily Shut-Down Procedure
1. Set the pump switch to RETRACT.
2. Trigger the gun off target until the proportioning pumps stop in the retracted (full
down) position and the pressure of both pumps bleeds off to approx. 500 psi.
IMPORTANT: DO NOT bleed the pressure to zero, as some pressure is required to
keep the packings operating normally and prevent seepage during shutdown.
3. Switch OFF the pump switch.
4. Turn the hose heat power set full counterclockwise.
IMPORTANT: Turn the hose heat power control full counterclockwise at every
shut-down to minimize the hose heat amperage and prevent damage to the phase
controller during start-up.
5. Switch OFF the hose heater and primary heater circuit breakers.
6. Switch OFF the main switch.
7. Close both inlet supply ball valves.
8. Coil and store the heated hose in a manner that prevents damage. Remove the hose
thermometer on manual hose heat units.
9. Shut down the chemical supply system as required.
10. Turn OFF the main air supply to the gun and transfer pumps.
11. Shut down and service the gun as required (see gun operating manual).
