Water heaters; compressor; fan; noise;
The paper made an investigation on noise problems of A.O Smith heat pump water heaters. One problem is that the noise and vibration performance of 1P compressor of wall hanging type water heater was unqualified. The sound pressure level of compressor sample was about 40dBA, and the clients hope to be controlled below 39dBA. Another problem is that the noise of HV-80 floor type water heater is large when used matching with the 1.5P compressor of our company. According to the test and analysis with Test.Lab software, it is found that the main noise came from fan and compressor. The solutions of noise reduction on fan and compressor were made and the consequences were recognized by clients and markets.