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4
4-1
Starting the Unit
UNIT START-UP (WITH MANUAL BLOW-OFF 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. Open the Return Valve and the Blow-Off Valve. Make sure the drain valves are
closed and plugged.
2. Add fluid to the reservoir tank until the level is near the top of the sight glass.
3. Close the Return Valve inside the unit.
4. Depress the "Pump Start" button to start the pump.
observing the pressure gauge. If the gauge indicates positive pressure, rotation is
correct. If not, disconnect power and reverse the incoming power leads.
5. 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.
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 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.
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).
TDH-6 Series Hot Oil Large Temperature Control Units
Startup Preparations
!
CAUTION
Check motor rotation by
Page 29
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