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 circuit issues, whether the three-phase power is normal or has phase loss. If there is phase loss, promptly ask an electrician to repair it; check if the fuse is intact and if the equipment itself is burned out.; Open the protective cover and use a multimeter to check whether individual heating elements are open-circuited.
2. Abnormal Temperature Display When the temperature data of the air electric heater displays abnormally, we first need to check whether the air switch is closed, and then check whether the control circuit is intact. After powering on, if the heater temperature cannot rise properly, we should troubleshoot the cause by first checking if the fuse is intact. If there is no problem, check whether the heater itself is damaged. In winter when temperatures often drop below 0°C, if no preventive measures are taken, the water in the heater can easily freeze, affecting normal operation and possibly causing pipe bursts. The reasons for freezing of surface coolers may vary by region. In milder climates, it may be due to the lack of a preheating coil in winter while water remains in the surface cooler. Freezing occurs after inhaling cold outdoor air.
At this point, attention should be paid to draining the water from the surface cooler when not in use in winter. For example, freezing of surface coolers in southern winter may be due to particularly low temperatures on certain days, where return air does not mix well 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 with 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 through a compression process. It features good mechanical strength, high thermal efficiency, wear resistance, and corrosion resistance. A guide baffle is installed inside the shell to ensure uniform heating of the air during circulation. The working principle of the control cabinet is to use an intelligent digital temperature controller, high-power thyristor, and thermal resistance to form measurement, regulation, and control circuits. 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, ensuring 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 elements, ensures energy saving and constant temperature, avoids current surges, and extends service life. When the equipment suddenly shuts down and restarts, the control cabinet can automatically adjust smoothly.
