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AEC/Appllcatlon Engineering
IMPORTANT!
AEC, Inc. strongly recommends AEC TrueThermTM
heat transfer fluid or equivalent for beat results.
Use of fluids not recommended by AEC, Inc. may void your warranty.
2. Close the
RETURN
valve halfway.
3. Open the
BLOW-OFF
valve.
4. Close the VENT valve.
5. Press
CONTROL POWER ON.
6. Press
PUMP START FORWARD
to start the pump. Check motor rotation by observing the
pressure gauge. If the gauge indicates positive pressure, rotation is correct. If not,
disconnect and lock out power, then reverse any two incoming power leads.
7. As fluid is drawn out of the reservoir
tank
to fill the process, fluid level falls in the tank.
Continue adding fluid to maintain the level about six inches above the bottom of the sight
glass.
8. The
BLOW-OFF
valve vents air into the reservoir
tank.
9. After 2 minutes of running, select a set point of l00°F (38°C) and switch the unit to Auto
mode. As the fluid warms up, viscosity decreases and pressure falls. Close the
RETURN
line
valve further to maintain a pressure of 30-50 psi.
I
0. Repeat Step 9 as necessary, increasing the set point to l 50°F (66°C) and 200°F (93°C).
11. When fluid level has stabilized and all air has been purged from the system, close the
BLOW-OFF
valve and open the
RETURN
valve.
12. With the system properly purged, you should be able to view only 6 to 8 inches of fluid in
the sight glass. This allows the fluid to expand as it heats; it also allows for process fluid
capacity when you reverse the pump and withdraw fluid from the mold.
13. Perform the Auto Tune procedure. See Section 5-9 on Page 38 for more information.
The TDH is ready to use. Select a process set point on the controller as described in Section 5-7
on Page 38 .
TOH True Temp"' Serles Hot Oil Temperature Control Units
Page29
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