Shutting Down The Unit; Returning Fluid To The Tank - AEC TDH-6 Series Operation And Installation Manual

4-2

Shutting Down the Unit

UNIT SHUT DOWN (WITH AUTOVENT SOLENOID OR MANUAL VENT VALVE)
Cool the unit down by switching the Mode switch to the "Manual Cool" position. This will
disable the heaters ( i.e. prevent the controller from turning them on) and open the cool solenoid.
Fluid temperature can be monitored on the controller display during cool down. When fluid
temperature is below 120ºF, depress the PUMP STOP button to turn the unit off.
4-3

Returning Fluid to the Tank

RETURNING FLUID TO TANK
If the unit is to be moved from one process to another (i.e. mold changes, etc.), the following
steps must be taken to drain the mold and process lines. Note that this is just the opposite of unit
start up/air purge:
1. Cool fluid to 150°F (66°C) maximum.
2. Depress the PUMP STOP push button.
3. Close the Return Valve.
4. Open the Blow Off Valve. (with autovent, the valve will open on its own)
5. Depress and hold the PUMP REVERSE push-button. The pump will then run in
reverse, drawing fluid from the mold and lines, and into the reservoir tank.
6. Watch the sight glass to prevent overflow of the reservoir tank.
The reservoir tank may not have adequate volume
An overflowing reservoir allows hot fluid to escape
The total capacity of the tank can be found on page 14.
If it appears that the tank may overfill, connect a line from the
a clean auxiliary container.
Page 32
!
CAUTION
to contain the total system capacity of fluid.
and become a potential fire and slip hazard.
FILL
TDH-6 Series Hot Oil Large Temperature Control Units
port of the reservoir tank to