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Old 03-14-2018, 08:21 PM   #1
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HVAC question

Yet another "newbie" question....

My ducted combo hvac system has a thermostat that has a "hi", "low" and "auto" fan setting. The fan seems to be part of the rooftop AC unit and I am assuming that the furnace has its own blower (since it is fairly quiet when the heat is on).

My main question is that when putting the fan in "auto", the fan is actually "off". I am a bit confused as to why the setting says "auto" instead of simply "off".

I moved into this unit before I had a chance to "study up" on living in an RV and I am encountering a bit of a learning curve.

Thanks in advance for any help.
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Old 03-14-2018, 08:33 PM   #2
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If the temp is 78 inside and you set it to 70 in Auto, does the fan still not blow? No cold air comes out when in Auto?
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Old 03-14-2018, 08:35 PM   #3
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When your fan is in auto it will turn On /Off automatically when AC unit turns On/Off according to the temperature you selected when you select the Cool mode. If you change the Fan setting to Hi/Lo your fan will then run continously at the HI or Lo setting you selected. The Hi/Lo Fan is handy when you simply want to circulate air without Cooling or Heating being turned on.
I sometimes run my electric fireplace and turn on Lo Fan to circulate the heat.
When you select Furnace then it turns on a different fan for the floor ducts.
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Old 03-14-2018, 08:37 PM   #4
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There is no OFF etting. AUTO means it comes on when temperature hvac demands air flow, and it blows on high. HI (or LO) means the fan runs on HI (or LO) whether or not the hvac is trying to change the temp.
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Old 03-14-2018, 10:51 PM   #5
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Some systems actually do have an off setting (off, auto, hi, low).

In cool mode, its almost always as follows:

Off - System completely off

Auto - Fan runs only when AC compressor turns on

Hi - Fan runs on hi continuously. AC compressor will turn on and off (air blow cold) as needed

Lo - Same as Hi except a lower fan speed.

In fan mode, its the same as above except the AC compressor will never turn on
In my case, I keep both AC controls on Cool mode - Auto.
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Old 03-15-2018, 12:20 AM   #6
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Thanks for the replies. I bought this unit before I was "up to speed" about rv'ing because it likely would have sold quickly and I liked the floor pan. That said, I am not as prepared (knowledge wise) as I need to be.

In my own defense, the manufacturers owners manual leaves a lot to be desired. I guess that they use the same book for about a hundred models. as such, the info is very generic.

"Thanks" to all for the helpful replies.
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Old 03-15-2018, 10:54 AM   #7
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Well, you would not have any better manuals with any other brand--they are all so generic as to be almost useless...
The answer by ac5501 is probably the clearest, keep it in mind.
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Old 03-15-2018, 11:00 AM   #8
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One thing NOT mentioned....

With the A/C FAN in Hi or Lo setting and thermostat set to HEAT the A/C Fan will come on when furnace runs
Idea is to help circulate warm air inside RV......actually ends up just be nosy and cooling the air down
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Old 03-16-2018, 10:17 PM   #9
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Quote:
Originally Posted by Old-Biscuit View Post
One thing NOT mentioned....

With the A/C FAN in Hi or Lo setting and thermostat set to HEAT the A/C Fan will come on when furnace runs
Idea is to help circulate warm air inside RV......actually ends up just be nosy and cooling the air down
Funny- I never encountered that til I installed the digital stats. Confused me for a moment before I figured it out.
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Old 03-18-2018, 09:52 AM   #10
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[QUOTE=wingnut60;4086340]Well, you would not have any better manuals with any other brand--they are all so generic as to be almost useless...
QUOTE]

That may be the understatement of the year.....
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