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Topic ClosedAir conditioner and furnace
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AKgo View Drop Down
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Joined: 11 Nov 2014
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Posts: 7 		Direct Link To This Post Topic: Air conditioner and furnace
    Posted: 27 Nov 2014 at 12:35pm
Greetings again....My second post.   We are new owners of a brand new 179....we are on our first outing and are having a problem.   First night out the temps dropped to about 28 degrees and we decided  to test the furnace.  The thermostat gives 3 selection...fan, cool, furnace.   I selected furnace and set a temperature and all worked well.  Night 2 was different.  Selected furnace and both the air conditioner and furnace came on.   Tried everything I could think of and finally killed the air by tripping the breaker, we were getting cold.  We have a small space heater, but I want to test all ewquipment to make sure it works.  This AM I turned the air breaker back on and same thing happened.  What in the ^%#%*& did I do wrong?????
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fwunder View Drop Down
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Posts: 1676 		Direct Link To This Post Posted: 27 Nov 2014 at 1:28pm
Hi AKgo,

You may find a solution in this thread:


Happy Holidays,

fred
2014 RPod 178 => MyMods and Buying Habits
2008 4Runner Limited 4.0-liter V6
Yes, those are wild ponies dining on grass while dumping tanks!
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AKgo View Drop Down
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Posts: 7 		Direct Link To This Post Posted: 27 Nov 2014 at 5:55pm
FWUnder.....Thanks....there was a thread within the thread....when on air it must be set on AU...not LO or HI....Thanks again...
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Luv2Q View Drop Down
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Posts: 309 		Direct Link To This Post Posted: 27 Nov 2014 at 8:52pm
Originally posted by AKgo

/ .. snip .. /....when on air it must be set on AU...not LO or HI....Thanks again...

Don't think it works quite as you described.  Here's how mine works.

Cooling:
A.  You want cooling and want fan working only when a/c compressor is on.
Actions: Set fan to AU then select Cool.
B.  You want cooling and want fan always on constantly regardless of whether a/c compressor is on.
Actions:  Set fan to Hi or Lo, wait for fan to come on, then select Cool.

Furnace:
A.  You want heat but use only the furnace fan.
Actions: Set fan to AU then select Heat.
B.  You want heat and want the a/c fan on constantly regardless of whether furnace is on.
Actions: Set fan to Hi or Lo, wait for fan to come on, then select Heat.

A couple of additional notes:
  1. When on heat, there is no way to have the a/c fan cycle on only when the furnace comes on.
  2. You'll notice I've suggested waiting for the fan to come on after selecting Hi or Lo.  This is not absolutely necessary.  If you immediately select Heat, likely not a problem.  If you immediately select Cool, however, without waiting for the fan to spin up, you could have a problem especially if you're using a 20 amp input or a smallish generator. 
This may be TMI but hope it helps.
John & Teri
Tundra 5.7L V8 / RP 180
E2 WDH / Integrated controller (POS) replaced by Tekonsha P3
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