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Old 07-07-2016, 01:57 PM   #1
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Should It, Or Not? And Then What?

I've brought up this question about our 2016 Jay Feather 23RLSW before, and I'd like to try again before cooler weather gets here. Here goes:
  1. Thermostat has 3 functions: Fan, AC, and Furnace. All 3 do function, except the quirky behavior that follows.
  2. Set the Fan on Auto.
  3. Set the Furnace temp so that it comes on.
  4. Sometimes - and ONLY sometimes - when the furnace comes on, the AC's calculator fan comes on as well. Not the AC, just its fan.
  5. Is it supposed to do that?
  6. If it is, why doesn't it do it all the time? And what do I check?
  7. Having the circulator fan run along with the furnace is a GREAT comfort feature, as it helps push warm air into the bedroom.
Additional note: The AC and furnace do not share any duct work. The furnace just blows heated air into the main cabin of the TT. When the circulator fan comes on, it pulls warm air from the main cabin of the TT and distributes it throughout, including the bathroom and bedroom.



FWIW, I contacted Jayco with that question and they did not confirm how this is supposed to work one way or another. Instead, they referred me to my dealer without answering my question. Should I infer from their response that the circulator fan *should* run when the furnace comes on while the fan is set on Auto???


What happens in your unit?


Thanks!


Roger
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Old 07-07-2016, 02:05 PM   #2
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With the fan on "Auto" it will cycle based on temperature. The fan will run whenever the temp in the RV is at or above the setting where the A/C compressor would be activated IF the mode was A/C.


So, yeah. A/C fan operation is a bit 'quirky'.
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Old 07-07-2016, 02:29 PM   #3
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Originally Posted by mike837go View Post
With the fan on "Auto" it will cycle based on temperature. The fan will run whenever the temp in the RV is at or above the setting where the A/C compressor would be activated IF the mode was A/C.


So, yeah. A/C fan operation is a bit 'quirky'.
I didn't include this, but AC temp is set 15 deg. higher, or more. Don't think this is the cause. But thanks for the suggestion!
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Old 07-07-2016, 06:45 PM   #4
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rkresge, I only had 1 chance to run the furnace since I got my 23RLSW. That's been over 3 months ago and I don't think the A/C fan came on with the furnace running. I'm sure I would have noticed it if it did.


The 1 thing I did notice with the furnace was that I had it set for 67 degrees and it didn't cycle on till it was about 63 degrees inside. That was using a accurate digital thermometer to see the actual temp.


Since we don't have ducted heat maybe that is a way to circulate warm air around the unit. Maybe mine may not be working correctly. I wish I could remember if it did come on.


Doesn't surprise me about Jayco not understanding their own units. I haven't found them real helpful when I contacted them. You would think they would have a wiring diagram and could answer your question by looking at that.


You may want to check the thermostat manual and see if anything is mentioned in it about the auto function.
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Old 07-07-2016, 06:53 PM   #5
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Doesn't surprise me about Jayco not understanding their own units. I haven't found them real helpful when I contacted them. You would think they would have a wiring diagram and could answer your question by looking at that.

You may want to check the thermostat manual and see if anything is mentioned in it about the auto function.
In this case I think it's lack of communication skills.

No thermostat manual came with the documentation, but it's a Dometic and I was able to find their docs for the thermostat online. Interesting that it says the Auto setting will cause the fan to come on with the AC, but it does not quite say one way or the other that the fan will come on with the furnace.

Thanks, Steve. Still hoping for a definitive answer from somewhere.
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Old 07-07-2016, 07:04 PM   #6
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the fan for the furnace is controlled by a limit switch and will come on only when the thermostat calls for heat not by the fan switch. When the fan switch is set to on, the AC fan will run constantly even if the heat/cool switch is set to off. The following thermostat settings will produce:
(Off - fan on) AC fan will run constantly
(Off - fan auto) nothing will go on
(Heat - fan on) AC fan will run constantly furnace will cycle based on temp
(Heat - fan auto) AC fan will never run furnace will cycle based on temp
(Cool - fan auto) AC fan will cycle with the compressor based on temp
(Cool - fan on) AC fan will run constantly and compressor will cycle based on temp

Hope this helps
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Old 07-07-2016, 07:20 PM   #7
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Originally Posted by JohnWedell View Post
the fan for the furnace is controlled by a limit switch and will come on only when the thermostat calls for heat not by the fan switch. When the fan switch is set to on, the AC fan will run constantly even if the heat/cool switch is set to off. The following thermostat settings will produce:
(Off - fan on) AC fan will run constantly
(Off - fan auto) nothing will go on
(Heat - fan on) AC fan will run constantly furnace will cycle based on temp
(Heat - fan auto) AC fan will never run furnace will cycle based on temp
(Cool - fan auto) AC fan will cycle with the compressor based on temp
(Cool - fan on) AC fan will run constantly and compressor will cycle based on temp

Hope this helps
Thanks! That's what I had suspected. Which does not explain why the AC fan has *sometimes* also come on with the furnace. Any idea what might cause that to happen?
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Old 07-07-2016, 07:30 PM   #8
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Sorry, you got me there, electrically it shouldn't happen. Maybe a thermostat or wiring problem.
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Old 07-07-2016, 08:52 PM   #9
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ID:	25400 rkresge, here is a photo of my thermostat. Same as yours? Not sure where the auto setting is your talking about. Is that in the menu when it is on?


Again, I haven't used it but 1 time 3 months ago.
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Old 07-08-2016, 07:31 AM   #10
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rkresge, here is a photo of my thermostat. Same as yours? Not sure where the auto setting is your talking about. Is that in the menu when it is on?
Yup, that's the thermostat. Top option is Fan, and it has 3 settings: Auto, Lo, and Hi.

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