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Page 24 Portable Hot Oil Temperature Control Units
9. When fluid level has stabilized and air and water is purged from the
system, close the Vent Valve. Do not open the Vent Valve above
250°F.
With the system properly purged, only 2 - 3" of fluid should be visible in the sight glass.
This will allow for expansion of the fluid as it heats, as well as capacity for process fluid
when the pump is reversed and fluid withdrawn from the mold.
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
Cool the unit down by changing the unit’s setpoint to zero. 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
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. Open the Vent Valve to allow in fresh air into the pipes.
3. Depress the STOP button.
4. If the unit is equipped with the pump reverse option, turn the
pump reverse switch to the “ON” position. The pump will
then run in reverse, drawing fluid from the mold and lines,
and into the reservoir tank.