What's the reasonable level of noise for the compressor of a new Carrier YX38030 2.5 Ton Heat Pump? It was recently installed this past April and matched with a Carrier FV4BNF002 Fan Coil. It works great and cools the house like a charm. My only concern is the noise emanating from the compressor.
I keep comparing the noise level that I'm hearing now--a constant buzzing--to the noise level, or lack of noise, the heat pump gave the first few days after installation. During the cooling test run really marvelled at how quiet the whole unit was at first. All I could hear was the turbine/fan on the heat pump.
Now that summer is here and I've been running the system pretty consistently, is it normal for the compressor to generate a consistent buzzing noise that was not present at installation? Or, should I expect this specific heat pump to be as quiet as I first heard it after installation? That is, hearing only the sounds of the turbine/fan?
I had the business who installed the system send out their tech a month ago to check it out and interestingly, the moment he hooked up his gauges to the unit, the buzzing sound ceased. He mentioned that the noise could be due to liquid slugging back into the compressor. He then identified the problem as the install guys incorrectly hooking up the connections to Y1-Low Speed Compressor instead of Y/Y2 Single or Hi Speed. Once this was corrected, the sound diminished.
Now, the sound is present again, but not as loud as before the service call. Before I think of calling them to come out again, I want to check with the pros on this board to see if I'm being too sensitive/unreasonable.
I may go to Radio Shack and get a noise meter to measure the decibels and compare the reading to the noise level Carrier claims.