Heat Pumps and Electric Heating - carrier heat pump gear noise on defrost

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awabrams
02-27-06, 10:08 AM
re: noise (gear grinding?) when carrier 38YXA030 goes into (or comes out of?) defrost cycle

greetings,

after countless calls to carrier complaing about noise we learned that there is a switch on the outdoor unit that has some sort of control over the defrost cycle. Can someone explain what this does, and if there's a risk of causing a freeze-up?

Thanks in advance,

Alan Abrams

Pendragon
02-27-06, 12:18 PM
What you are probably hearing is the reversing valve, which reverses the flow of coolant to enable defrost. Defrost is a noisy (and sometimes steamy) process, you aren't the first to think something is wrong with it.

It's particularlly noisy coming out of defrost, less so going into defrost.
awabrams
02-27-06, 03:02 PM
thanks Pendragon. we are aware of the noise that is characteristic of defrost. however, it seems like it has been a bigger than average issue with the new carriers; apparently they redesigned their pump recently to address the noise issue.

Now they tell us--if noise is a problem-- to flip "dipswitch number 3" to the reverse position. But I'm having trouble understanding what that is supposed to do.

Cheers,

Alan