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Old 01-07-2013, 01:10 PM   #15
Rivet Master
1988 32' Excella
Robbinsville , New Jersey
Join Date: May 2012
Posts: 1,017
Originally Posted by afneill View Post
Generally Thermostat wire is 18 or 20 AWG wire which is used only for sending a signal to a contactor which uses that signal to close the contacts to complete a 120v circuit to the AC/Heat pump. The T-stat wire usually carries only low voltage, 12v.
True but phone and network wire is only 24 AWG so undersized for thermostats and the connecters are a weaker point then the wire.

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Old 01-07-2013, 03:53 PM   #16
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1992 34' Excella
Austin , Texas
Join Date: Mar 2007
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I've got a single Dometic heat pump and my manual says that when the outside temp reaches 40 the compressor will shut down and will not run again until the ambient temp reaches 45 or better. When it's somewhere near that temp, my fan turns off with the compressor still running and stays that way for 5-10 minutes before the fan comes back on. My guess is that the unit is running the compressor to heat the freon as much as it can before any heat is extracted. I turn on a couple of electric heaters when the temp is going to drop into the 30's. Even with those operating quirks I still like mine quite a bit.

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