1. The power of the PTC heater is greatly affected by the external environment. The ideal test method is to stop the device in the whole machine under the standard working conditions. Usually, in order to facilitate the inspection and confirmation of both parties, in practice, the test is performed after adjusting the relevant parameters of the imitating air duct with the sealed sample confirmed in the complete machine. During the test, the ambient temperature is generally maintained at about 20～25℃.
2. The PTC heater has heat shrinkage phenomenon when it is working, so it should be considered that there is a certain gap (above 5mm) around the heater when designing the structure;
3. If you choose an external electric heater, you should also consider the anti-electric shock measures and the safety distance of the evaporator when the evaporator is frosted to ensure that there is no possibility of touching the human body, metal objects and frost layer. It is safer to choose an exterior insulated heater;
4. When the heater is connected to a three-phase power supply, a Y-type connection should be used, and the neutral point must be connected to the zero line to prevent the potential for high voltage at the heater terminal due to the unbalanced three-phase.
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