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Old 10-31-2020, 07:47 AM   #1
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Always on for furnace fan?

Hey, looking for some advice, I can’t seem to figure out how to set the fan on my furnace to run all the time! Maybe this is not an option on my current unit? I have never had an issue with previous RVs. Any guidance would be great!

I have a 2021 Flagstaff Microlite 25FKS
Furnace is the Suburban SFV35FQ
Thermostat is a manual Coleman Mack (photo attached)

I have tried every position on the thermostat and it makes no difference in regards to the furnace fan running. It works fine with the ac but heat, the fan only turns on when heat is called for.
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Old 10-31-2020, 07:51 AM   #2
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Your fan switch seems to be on “low on”. Try putting it on one of the “auto” settings and leave it there until a few minutes after the furnace shuts off. The fan should then shut off unless the furnace turns on again.
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Old 10-31-2020, 07:51 AM   #3
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You should be able to set the bottom right “FAN” switch to “LOW” or “HIGH” by choosing one of the two detents on the right side where it says “ON”.

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Old 10-31-2020, 07:53 AM   #4
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Quote:
Originally Posted by eye95 View Post
Your fan switch seems to be on “low on”. Try putting it on one of the “auto” settings and leave it there until a few minutes after the furnace shuts off. The fan should then shut off unless the furnace turns on again.
The OP is trying to accomplish the opposite of what you described.

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Old 10-31-2020, 07:55 AM   #5
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Welcome from New Jersey, I have the same control in my unit, I don't think the fan will stay on when the heater cycles off, It would be blowing cold air.
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Old 10-31-2020, 07:57 AM   #6
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It would be blowing cold air.
It wouldn’t be blowing cold air. It would be recirculating interior ambient air.

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Old 10-31-2020, 07:58 AM   #7
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Thanks, my goal is to have the fan run all the time, not just when heat is called for, I hate the cycling of the fan when trying to sleep. I have tried every position on the thermostat and none keep the fan running.
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Old 10-31-2020, 08:06 AM   #8
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Originally Posted by Truckinggreg View Post
Thanks, my goal is to have the fan run all the time, not just when heat is called for, I hate the cycling of the fan when trying to sleep. I have tried every position on the thermostat and none keep the fan running.
Not possible with your current thermostat.
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Old 10-31-2020, 08:14 AM   #9
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Not possible with your current thermostat.
That’s what I was thinking! Do you know if it’s possible with that furnace if I switch out the thermostat? Any ideas on what thermostat would allow that and would work in the RV?

Thanks for the help!
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Old 10-31-2020, 08:21 AM   #10
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Originally Posted by 5picker View Post
Not possible with your current thermostat.
I’m not doubting what you say is true, but what is it about that thermostat that makes it impossible?

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Old 10-31-2020, 08:22 AM   #11
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The OP is trying to accomplish the opposite of what you described.

Bruce
Thank you. You are correct. Your solution is the right one.
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Old 10-31-2020, 08:25 AM   #12
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Thank you. You are correct. Your solution is the right one.
But, apparently, even that won’t work with that thermostat, either.

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Old 10-31-2020, 10:59 AM   #13
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Originally Posted by nomad297 View Post
I’m not doubting what you say is true, but what is it about that thermostat that makes it impossible?

Bruce
I'm simply saying that particular basic thermostat has no option to run the fan constantly with furnace use.

The OP 'could' wire a switch to the fan motor to provide constant power or possibly find a home heating type 'stat (geothermal comes to mind) that would provide constant power to the fan/blower but that's another discussion.
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Old 10-31-2020, 11:24 AM   #14
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A word of caution about always having the fan on:

I don’t know if this is the case for RVs, or for the OPs RV, but my understanding of home HVAC systems is that they draw at least some of their input air from the outside. (Probably to avoid air inside from becoming “stale”.)

If an RV draws some of its input air from outside, it could blow cold air while the heater is off, but the fan is on.
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Old 10-31-2020, 11:43 AM   #15
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Thanks for the help and ideas! ! I was worried that I was missing something or something was broken.
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Old 10-31-2020, 11:43 AM   #16
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Quote:
Originally Posted by eye95 View Post
A word of caution about always having the fan on:

I don’t know if this is the case for RVs, or for the OPs RV, but my understanding of home HVAC systems is that they draw at least some of their input air from the outside. (Probably to avoid air inside from becoming “stale”.)

If an RV draws some of its input air from outside, it could blow cold air while the heater is off, but the fan is on.
The RV furnace does not draw air from outside for distribution (mixing) inside. There is no control for the fan speed within the RV furnace. Setting the thermostat fan speed to LO/HI only controls the A/C fan. Setting the thermostat fan speed for AU keeps the A/C fan from coming on when furnace mode is selected.
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Old 10-31-2020, 12:22 PM   #17
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Quote:
Originally Posted by Truckinggreg View Post
Thanks for the help and ideas! ! I was worried that I was missing something or something was broken.

You can modify the furnace wiring to make fan work as you wish. You will need to pull out furnace and modify/add wiring as per sketch below and using a 3 way light switch.
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File Type: pdf Suburban furnace mod wiring.pdf (699.0 KB, 46 views)
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Old 10-31-2020, 01:23 PM   #18
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Umm...

Quote:
Originally Posted by eye95 View Post
Your fan switch seems to be on “low on”. Try putting it on one of the “auto” settings and leave it there until a few minutes after the furnace shuts off. The fan should then shut off unless the furnace turns on again.
Umm... I think the OP wants it always ON, not OFF. He did say
Quote:
how to set the fan on my furnace to run all the time!
That would be SYSTEM=FAN and FAN=ON-->LOW or FAN=ON-->HIGH
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Old 10-31-2020, 02:01 PM   #19
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Quote:
Originally Posted by Larry-NC View Post
Umm... I think the OP wants it always ON, not OFF. He did say


That would be SYSTEM=FAN and FAN=ON-->LOW or FAN=ON-->HIGH
He acknowledged the “always ON” in post #11.
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Old 11-01-2020, 10:06 AM   #20
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Quote:
Originally Posted by nomad297 View Post
You should be able to set the bottom right “FAN” switch to “LOW” or “HIGH” by choosing one of the two detents on the right side where it says “ON”.

Bruce
You want Low for Heat & High for A/C !!!
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