Sterlco Midsize - Manual (Page 25)

Portable Hot Oil Temperature Control Units Page 25
The portable hot oil temperature control unit is now ready for use. All that is required is to
select a process set point on the controller as described in the controller manual.
Note: If all traces of water are not removed from the system,
severe cavitation may occur at elevated temperatures.
Indications are a “gravely” sounding pump, fluctuating
or dropping pressure, or rapidly rising fluid level in the
expansion tank. Repeat Step #7 if this occurs.
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, if equipped with optional heat exchanger. 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 (With Autovent Solenoid)
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 100 degrees °F maximum.
2. Depress the PUMP STOP push button.
3. 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.
4. Watch the sight glass to prevent overflow of the reservoir
tank.
!
CAUTION
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).