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Old 10-19-2021, 03:01 PM   #1
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Dometic A/C / Suburban Furnace Newbie questions

2017 FR Blue Ridge 5th wheel
Two Dometic 15k A/Cís with Digital Thermostats
One Suburban Propane Furnace with floor ducts.
Just bought this, no manual, never owned an RV
Both T-Stats have furnace mode yet only overhead units come on in that mode
Heat strip?
No T-Stat for furnace only, that I can find.

Are they interconnected?

First time trying to start the furnace and not interested in a Fireworks display.

Not a rookie to systems and components, just this rig.

What Iím I looking for/ missing?

All help welcome, be kind.....
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Old 10-22-2021, 07:40 PM   #2
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Model numbers of the A/C's will help as will a picture of the thermostat.

Ray
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Old 10-22-2021, 08:41 PM   #3
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So you’re not having any fireworks, right?
If your trailer is like mine, the front thermostat operates the front A/C unit and the back thermostat operates the back A/C. Don’t stop reading. If either thermostat’s FAN mode is set to LO or HI, the corresponding A/C unit’s blower will come on when you set the thermostat mode to HEAT (Furnace). If you plan to set the thermostat to HEAT, set the fan speed to AU (for Auto) to avoid the confusion of the upper blower running.
Now… only my living room thermostat will operate the furnace although the front (bedroom) thermostat has a mode setting for HEAT.
Use my system’s operation as a guide and experiment with your system.
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Old 10-23-2021, 04:01 PM   #4
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Mr. Dan- youíre previous post might be the answer to my problem. 2020 36DSX13 Boost toy hauler. Stayed in it last night and only thing that I hadnít run is the furnace. Came right on so I shut it down until last night. The TH came up to temp but the A/C blower heat running, even when no heat came out of the floor ducts. Iím going to check the front thermostat. Furnace is a Suburban SF series. Not sure of exact model. Nothing in installation instructions provided with unit. JB
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Old 10-23-2021, 04:38 PM   #5
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Just watched a you tube clip on the furnace/thermostat setting. Must have missed the ďautoĒ fan setting. Had it on low. No wonder the A/C fan blew all night. A lot of great info on this forum! Thanks to all. JB
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Old 10-23-2021, 05:12 PM   #6
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Quote:
Originally Posted by JB23 View Post
Just watched a you tube clip on the furnace/thermostat setting. Must have missed the ďautoĒ fan setting. Had it on low. No wonder the A/C fan blew all night. A lot of great info on this forum! Thanks to all. JB
I wrote this to keep you from having to do more research - to prevent the need for you tube viewing; "If you plan to set the thermostat to HEAT, set the fan speed to AU (for Auto) to avoid the confusion of the upper blower running."
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