Air Purge, Pressure Switch, Reservoir Tank

Air Purge

Upon initial start-up and mold/process change-out, you’ll need to purge all air and water from the system. The Upright unit has appropriate valving to ensure complete purging. Procedures are covered in Section 3-5 on Page 23.

WARNING! Failure to purge the system of air before heating may result in serious injury or critical system and equipment damage. Make sure you properly purge the system of air before starting the heater cycle.

Pressure Switch

A pressure switch is built into each unit to guard against heater damage. This feature prevents the heater elements from being energized unless the pump is running and fluid is in the system. After a preset time, the pump shuts down if the fluid pressure is not re-established. The pressure switch is preset at the factory; do not tamper with it.

Safety Thermostat

The safety thermostat is a J-thermocouple sensing, adjustable fail-safe device located in the heater tank. This is to guard against the unlikely event of “runaway” heating. If over-heating does occur, the safety thermostat shuts down the heater outputs and sounds an audible alarm. A red pilot light on the status board also illuminates. The unit continues to pump fluid through the system to prevent heater damage. Auxiliary factory installed alarms such as beacons and klaxons are available as options.

All controller functions are locked out until the main supply power is disconnected. Resetting the alarm condition is initiated by depressing the red pump stop button. The reset button is located inside the electrical enclosure, mounted on the left wall of the enclosure. It is imperative that a qualified maintenance technician determine and correct the cause of the fault before resuming operation.

Reservoir Tank

A reservoir tank with sight gauge is standard; usable capacity is seven (7) gallons (26.5 liters). The tank permits thermal expansion of the heat transfer fluid, and provides makeup fluid.

WARNING! The reservoir tank may cause serious injury if it ruptures from not being properly vented. Make sure that the reservoir tank is always properly vented to prevent tank rupture.

The reservoir tank drain is extended beyond the base of the unit for ease of draining. Optional ball valves are available to further simplify draining.

Upright Portable Hot Oil TCUs

Chapter 2: Functional Description