Sterlco Midsize - Manual (Page 24)

Page 24 Portable Hot Oil Temperature Control Units
Unit Start-up (With Manual Vent Valve)
The highly engineered controls and controller make this unit almost self operating. Before
you can begin heating, it will be necessary to perform the following start up procedures. This
will ensure that all air is vented from the system to prevent fluid degradation and damage to
the heater.
1. Add fluid to the reservoir tank until the level is near the top of the
sight glass.
2. Open the Vent Valve on the back of the unit.
3. Depress the "Pump Start" button to start the pump. Check motor
rotation by observing the pressure gauge. If the gauge indicates
positive pressure, rotation is correct. If not, disconnect power and
reverse the incoming power leads.
4. As fluid is drawn out of the reservoir tank to fill the process, the fluid
level will fall in the tank. Continue to add fluid to maintain the level
about 4 inches from the bottom of the sight glass.
!
CAUTION
You must purge the system of air before the heating cycle.
Personal injury and system damage can occur from a pressurized
system.
5. Air and Oil will be vented through the Vent Valve and into the
reservoir tank.
6. 2 minutes after the unit has built at least 5psi of pressure, select a set
point of 100°F and switch unit into the "Auto" mode. As the oil
warms up, viscosity will decrease, and the pressure will fall.
7. With 2 minute intervals increase the setpoint to 150 and 200 °F.
8. If any water is present in the system, it must be boiled off before
continuing operation. Select a setpoint of 215ºF (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.
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 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when the pump is reversed and fluid withdrawn from the mold.