Before operating the space heater, the cold insulation resistance of the power access terminal and the metal shell should be measured and shall not be less than 20MΩ. The input voltage to the heating element assembly of the electric heater is 380V. If it is a star connection, the voltage of a single electric heating element is 220V; if it is a delta connection, the voltage of a single electric heating element is 380V. The wiring between the outgoing cable of the control cabinet and the heating element group on the electric heater body should be connected in accordance with the regulations and must not be connected indiscriminately. Start the fan and blow the air heater body and pipes for five minutes to check whether they are smooth. After the control cabinet is powered on, check whether the indication of the indicator light is correct and whether the temperature display, adjustment and alarm of the PLC control cabinet manufacturer's intelligent digital temperature controller are sensitive and accurate. If there are any abnormalities, they should be dealt with in time.

During inspection, pay attention to whether there is a large deviation in the pointer values of the three ammeters. If the fan stops working for any reason during use, the air heater should be powered off in time. ˆ

1. Heating of chemical materials in the chemical industry, drying of some powders under a certain pressure, chemical process of air heater manufacturers and spray drying.

2. Hydrocarbon heating, including petroleum crude oil, heavy oil, fuel oil, thermal oil, lubricating oil, paraffin, etc.

3. Heating process water, superheated steam, molten salt, nitrogen (air) gas, water gas and other fluids that need to be heated. Debugging steps for the air heater: Check whether the air heater shell and the control cabinet shell are reliably grounded. Check whether the power cord, output connection, and low-voltage distribution cabinet supplier's thermal resistor wiring are correct and well insulated. Whether the components and fasteners of the control cabinet are loose. If there are any abnormalities, they should be dealt with in time.

Turn on the power switch and the air switch in the control cabinet. The relevant indicator lights should be on and the digital temperature controller light should be on. Set the maximum and minimum temperature values on the intelligent digital temperature controller. Start the electric heater, the heater starts to work and is automatically controlled according to the set temperature.

If there is an imbalance, you can change the phase to see if it is balanced. If it is still unbalanced, further inspection and treatment are required. The control system of the electric heater can be divided into two categories. One is the hybrid control method. The motor starts the control box, which requires the electric heater and the control system to be connected together first. Control can then be taken. Relatively speaking, the system structure of this control method is relatively complex and the investment cost is relatively high. On the other hand, due to the many transformation links in the output channel of the electric heater, especially the transformation of analog quantities, the nonlinearity is relatively serious, resulting in poor anti-interference performance and low control accuracy. In addition, the reliability of this control method is relatively poor and prone to failure. The type and characteristics of the control system in electric heaters. The other is pure computer control. The control method of electric heaters is completely different. It removes D/A conversion, voltage signal amplification, and process at its output end. In the conversion of high-frequency and high-frequency pulse signals, the TTL level pulse signal is directly used to control the on-off of the solid-state relay, and the solid-state relay controls the on-off of the electric heater, which greatly simplifies the control process of the electric heater. Not only that, it also overcomes the shortcomings of the first control method and gives full play to the advantages of computer technology, so that the electric heater can not only greatly reduce costs, but also greatly improve control accuracy. In addition, its anti-interference function and reliability are also more guaranteed, which is the basis for the safe, efficient and stable operation of electric heaters. Since the production processes used by various manufacturers to produce electric heater products are different, there are not only differences in product quality, but also differences in the price of electric heaters. To ensure product quality, the production process must be relatively good, so the cost cannot be too low.We will ignore this aspect of attention, but it is very important, because no matter how good the electric heater is, it will sometimes malfunction, which requires complete after-sales service to solve it, thereby reducing the scope of the problem.