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6017 Series Hot Oil Large Temperature Control Units Page 31
! CAUTION
You must purge the system of air before the heating cycle.
Personal injury and system damage can occur from a pressurized system.
6. Air and Oil will be vented through the automatic Blow-Off Valve and into the
reservoir tank.
7. After the unit stops requiring more oil and has at least 5 psi of pressure, open the
Return Valve half way. If the Blow-Off cycle times out, start the sequence again.
The timer is factory set at 5 minutes. A longer time can be set if required. The first
time the unit is filled with oil it takes some time to vent out the air. You should
determine how long is appropriate for venting on a regular basis when the unit is
already full.
8. Once the unit has stopped requiring more oil again and has at least 10 psi of pressure,
select a set point of 100°F (38°C) and switch unit into the "Auto" mode. As the oil
warms up, viscosity will decrease, and the pressure will fall.
9. In 2-minute intervals increase the setpoint to 150°F (66°C) and 200°F (93°C).
10. If any water is present in the system, it must be boiled off before continuing
operation. Select a setpoint of 215°F (102ºC) and observe the reservoir tank vent for
any signs of escaping steam. Continue to run at 215ºF (102ºC) until no more steam
appears and pressure has stabilized. Restart the Blow Off cycle as necessary if it
times out.
11. When fluid level has stabilized and air and water are purged from the system, open
the Return Valve all the way. And select a setpoint of 250°F (121°C). Restart the
Blow Off cycle as necessary if it times out.
12. If the fluid level and pressure remain stable allow the Blow-Off Valve to close. The
vent valve will not open the Blow-Off above 250°F.
With the system properly purged, only 4 - 6" 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pump is reversed and fluid withdrawn from the mold.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 6017 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 Steps #9-12 if this
occurs.