How to detect potential problems?
1. Air Electric Heater Stop operation and check the power supply of the air electric heater to ensure whether the problem is caused by the circuit, whether the three-phase power is normal or has phase loss. If there is phase loss, ask an electrician to repair it in time; check whether the fuse is intact and whether the equipment itself is burned out.; Open the protective cover and use a multimeter to check whether the single heating element is open circuit.
2. Abnormal Temperature Display When the temperature data of the air electric heater is abnormal, we first need to check whether the air switch is closed, and then check whether the control circuit is intact; after power-on, the heater temperature cannot rise properly. We need to troubleshoot the cause. First check whether the fuse is intact. If there is no problem, check whether the heater itself is damaged. In winter when the temperature is often below 0°C, if no measures are taken, the water in the heater can easily freeze, affecting normal operation and possibly causing the pipeline to burst. The reasons for freezing of the surface cooler may vary by region. In milder climates, it may be because there is no preheating coil in winter and there is water in the surface cooler. Freezing occurs after inhaling cold outdoor air.
At this time, attention should be paid to draining the water from the surface cooler when not in use in winter. For example, in the south, freezing of the surface cooler in winter may be due to particularly low temperatures on a certain day, where the return air is not well mixed with fresh air, causing cold outdoor air to blow directly onto the surface cooler. We can install a mixing valve to fully mix fresh air and return air. The air electric heater body consists of multiple tubular heating elements, a shell, a protective cover, a base, and other components. The heating element is a tubular electric heating element made of high-temperature resistance alloy wire, with a stainless steel tube as the protective sleeve, filled with crystalline magnesium oxide, and formed by a compression process. It has good mechanical strength, high thermal efficiency, wear resistance, and corrosion resistance. A guide baffle is installed inside the shell to evenly distribute the air flow for uniform heating. The working principle of the control cabinet is to use an intelligent digital temperature controller, high-power thyristor, and thermal resistance to form a measurement, regulation, and control circuit. The thermal resistance converts the heater outlet temperature into a milliampere signal, which is sent to the intelligent digital temperature controller for amplification and comparison, then displays the corresponding temperature value. When the displayed value is higher than the set value, the thyristor does not conduct. When the displayed value is lower than the set value, the intelligent digital temperature controller triggers the thyristor to conduct. When the displayed value is close to the set value (i.e., near the set value), the intelligent digital temperature controller changes according to P, I, D rules, giving the control cabinet good control accuracy and regulation performance. The intelligent digital temperature controller automatically changes the number of trigger pulses of the thyristor based on the milliampere signal from the thermal resistance, i.e., controls the conduction angle of the thyristor per unit time, adjusts the voltage, controls the heating power of the heating element, ensures energy saving and constant temperature, avoids current surge, and extends service life. When the equipment suddenly shuts down and restarts, the control cabinet can automatically adjust smoothly.
