WTR2-640
Chapter 4: Operation
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4-3 Returning Fluid to the Tank
If you want to move the unit from one process to another (like mold changes), perform
the following steps to drain the mold and process lines.
This procedure is just the opposite of the unit startup/air purge procedure.
1. Cool the heat transfer fluid to no more than 100°F (38ºC).
2. If so equipped, open the manual vent valve to add air into the pipes.
3. Press the PUMP STOP button.
4. Press and hold the PUMP REVERSE button.
The pump runs in reverse, drawing fluid from the mold and lines, then drains
the fluid into the reservoir tank.
5. Watch the sight glass to prevent overflow of the reservoir tank.
The reservoir tank may not have adequate volume to contain the total
system capacity of fluid.
An overflowing reservoir allows hot fluid to escape and become a potential
fire and slip hazard.
The total capacity of the tank is 7 gallons (26.5 liters).
If it appears that the tank may overfill, connect a line from the FILL port of the reservoir
tank to a clean auxiliary container.
4-4 Shutting Down the Hot Oil TCU
1. Cool down the unit by switching the CONTROL MODE switch to the MAN.
COOL (manual cooling) position.
This step disables the heaters (prevents the controller from turning them on) and, if
so equipped, opens the Cool solenoid.
2. You can monitor fluid temperature on the controller display during cool-down.
When fluid temperature dips below 120ºF (49ºC), press the PUMP STOP button
to turn off the unit.
