Heat Pumps and Electric Heating - Before I dig in.. One last question

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v b chil-n
02-15-06, 04:02 PM
My parts came today... woooooo hoooooo
one defrost sensor a defrost timer and a crappy installation sheet for the heat pump ( I thought I was ordering a user manual)

I went in the attic to check to make sure I had 24V and I did.
but I also noticed that the 24v line runs right to a small line that goes into where the filter is mounted, looks like some sort of sensor..
what is that little thing called and what does it do.