Analysis of Common Issues During the Operation of Electrically Heated Jacketed Kettles

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The electrically heated jacketed kettle utilizes high-power electric heating tubes to generate heat, employing thermal oil as a medium for heat transfer. It is characterized by a large heating surface area, high thermal efficiency, uniform heating, rapid temperature rise, and flexible control. Widely adopted in hotels, restaurants, industrial and mining enterprises, schools, and food processing plants, it is suitable for tasks such as cooking porridge and stewing meat. Furthermore, it serves various industries—including confectionery, baking, beverages, fruit juices, pharmaceuticals, and daily chemical products—for applications such as material melting, sterilization, heating, pre-cooking, formulation, boiling, and concentration.

As this product relies on high-power electric heating, it imposes strict requirements on the electrical connection. The incoming three-phase AC power supply must strictly comply with the equipment’s specific power specifications. Where necessary, a leakage protection device should be installed. It is imperative to ensure proper grounding for the equipment and that all electrical connections meet regulatory standards. The electrical distribution box must be protected from water ingress and moisture, and the control circuitry must not be altered arbitrarily.

During the heating process, the exhaust valve located on the kettle body must remain open. This prevents accidents caused by excessive pressure buildup resulting from the thermal expansion of the heating oil.

During operation, the consumption level of the thermal oil should be monitored regularly; if the oil becomes contaminated, it must be replaced promptly. Additionally, the heating tubes should be cleaned at least once every six months to remove any accumulated oil residue, thereby preventing impaired heat transfer that could lead to equipment damage.

Common Faults and Troubleshooting Methods

I. The power indicator light does not illuminate: Please check whether the power input lines are connected correctly and ensure that the electrical contacts are secure.

II. The heating indicator light does not illuminate: Please check the condition of the relay and the AC contactor.

III. Heating is slow: Please check whether there is a phase loss (missing phase) in the power supply; also, check the condition of the heating elements and ensure their surfaces are free of oil stains.

IV. Heating is rapid, but the contents do not come to a boil: Please check if the thermal oil level is too low; add an appropriate amount of thermal oil as needed.

V. During the heating process, abnormal noises or even spurting oil are observed within the jacketed layer of the pot: This indicates the presence of a small amount of water mixed in with the thermal oil. As the heating progresses, the water will evaporate, and this phenomenon will resolve itself.

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