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Old 05-28-2013, 09:30 PM   #1
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Heater-AC Fan

It got cold first night in foothills of Virginia, go figure. Turned on heater in the dining area and the AC unit fans came on. Heater cycled off but AC unit Fans continued. Used heater from rear controller (bedroom) same story but with rear AC unit fans. Has anyone asked Coachmen about this? Is it normal? Seems like a very strange operational mode if this is normal. On a hot day AC runs, room reaches temperature that is set, compressor goes off but fan continues to run on AC. Coachmen really needs to work on a good Coach Operations manual to explain how everything functions. Hot water heater DSI fault kept illuminating. I found the detailed manual on-line and found several reasons...had to adjust the air mix tube, gas was pulsing. After the adjustment everything was smooth (combustion) and no more DSI faults. I will post download for the hot water heater and a really excellent troubleshooting site.
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Old 05-28-2013, 09:50 PM   #2
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Sounds very strange. My Sportscoach has to thermostats, one in the bed room for rooftop unit only and one in the main area that runs furnace nc forward rooftop. Both ave auto or maul controls for fan only mode but nothing tied together like your situation. Maybe a crossed or missed wired stat?
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Old 05-28-2013, 10:03 PM   #3
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check your thermostat, if it is a dometic or like and you have the fan speed set on low or high and you run the heat the a/c fan will come on. If you set the fan speed to auto it will not do this.
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Old 05-28-2013, 10:04 PM   #4
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Ran into the same issue with my Cardinal. I had to pull out the instructions for the thermostat and read. I found out that you had to "fan" function on the main living thermostat in "auto" mode to get the AC to shut off. (I also had the bed room thermostat shut off - not sure if this is important or not??) If you have the fan in "hi" or "lo" mode the AC runs to circulate the air in the coach. The problem I found was the air coming out of the ceiling vents was cold.
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Old 05-29-2013, 07:22 AM   #5
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Quote:
Originally Posted by Scott Colegrove View Post
check your thermostat, if it is a dometic or like and you have the fan speed set on low or high and you run the heat the a/c fan will come on. If you set the fan speed to auto it will not do this.

This should do it. I actually like the consistent/ambient noise, so I have mine set to keep the fan on at all times, weather I have the heat or AC on.

On another note -- not sure if you have this or not -- It seems like my AC is not distributed evenly throughout the ceiling coach vents (some blow out a lot more air than others). Same with the floor registers for heat. We get a TON of heat in the small bathroom, though. When we purchased the coach, was told that Coachmen has a unique ducting system through the ceiling somehow and they wouldn't be able to alter this in any way without ripping the ceiling apart. Lovely.
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Old 05-29-2013, 12:35 PM   #6
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This should do it. I actually like the consistent/ambient noise, so I have mine set to keep the fan on at all times, weather I have the heat or AC on.

On another note -- not sure if you have this or not -- It seems like my AC is not distributed evenly throughout the ceiling coach vents (some blow out a lot more air than others). Same with the floor registers for heat. We get a TON of heat in the small bathroom, though. When we purchased the coach, was told that Coachmen has a unique ducting system through the ceiling somehow and they wouldn't be able to alter this in any way without ripping the ceiling apart. Lovely.
We had the AC continue to run after the furnace shut down too. Dealer figured it out and advised the fan setting to stop it. No problem since.

Agree that the AC vents in the ceiling do not distribute evenly but would add that this has not really been a problem for us. The good news is that that AC units are adequate even in very hot weather and will keep your coach cool for you.

The heating ductwork is another matter and we have the same issue. Heat pours out of the bathroom vent (no way to close it, did you notice that) and heat just trickles out of the bedroom vent. I took the bathroom vent off and covered the rear with metal tape, then cut a small hole in the tape about 1/2 inch by 1 1/4 inches to restrict the air flow into the bath and hopefull force more heat out in the bedroom. My solution was only about 40% effective. A little more heat in the bedroom now but mostly the extra air flow goes into the kitcheon and the living room, neither of those vents are adjustable either.

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Old 05-29-2013, 05:05 PM   #7
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We had the AC continue to run after the furnace shut down too. Dealer figured it out and advised the fan setting to stop it. No problem since.

Agree that the AC vents in the ceiling do not distribute evenly but would add that this has not really been a problem for us. The good news is that that AC units are adequate even in very hot weather and will keep your coach cool for you.

The heating ductwork is another matter and we have the same issue. Heat pours out of the bathroom vent (no way to close it, did you notice that) and heat just trickles out of the bedroom vent. I took the bathroom vent off and covered the rear with metal tape, then cut a small hole in the tape about 1/2 inch by 1 1/4 inches to restrict the air flow into the bath and hopefull force more heat out in the bedroom. My solution was only about 40% effective. A little more heat in the bedroom now but mostly the extra air flow goes into the kitcheon and the living room, neither of those vents are adjustable either.

Roll
I will do some experiments that I will run on the AC ducting. I have a theory I want to try out. More later, if it pans out. I will try to chase down the uneven heat from bathroom/bedroom registers. If they are separate runs it might be a simple matter of switching the feeds at the furnace. Flow could be as simple as positoning at the heater of the duct feed in relation to its position with the fan. I think the heater fan is a squirel cage induction fan. If so the further you are away from the center, the weaker the flow, we'll see.
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Old 05-30-2013, 07:38 AM   #8
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Has to be something like that since I have the exact experience Roll has as well (heat gushing out of bathroom; not as much in bedroom floor vents).

On extremely hot days, we definitely need to get that AC on EARLY to ensure we cool the coach down. From what I understand, this is just the nature of the beast for Class As in general.

Interestingly enough, when I asked about upgrading the ACs to larger units, was told that it wouldn't truly help cool the coach down any better. This weekend should be a good test - 95 degrees with increasing humidity. With no shade. Yowza! I picked up two fans last year in case we ever needed them to help the AC. They may make their debut in the rig this weekend!
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Old 05-30-2013, 05:55 PM   #9
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Has to be something like that since I have the exact experience Roll has as well (heat gushing out of bathroom; not as much in bedroom floor vents).

On extremely hot days, we definitely need to get that AC on EARLY to ensure we cool the coach down. From what I understand, this is just the nature of the beast for Class As in general.

Interestingly enough, when I asked about upgrading the ACs to larger units, was told that it wouldn't truly help cool the coach down any better. This weekend should be a good test - 95 degrees with increasing humidity. With no shade. Yowza! I picked up two fans last year in case we ever needed them to help the AC. They may make their debut in the rig this weekend!
I checked into this also. Our units have 13.5K BTU's for output. The best that could be used in our amperage rating is a 15K BTU unit so that would be a net gain of 3K BTUs. Not much of a gain only 10%. Have thought about replacing them with a heatpump unit, then you would have heat and AC, have to check the amps though. If near the 13.5 or 15K BTUs then it would work.
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Old 05-31-2013, 08:30 AM   #10
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If I may... give your ACs a chance. We camped last July in Texas; no shade and it was a heat wave down there at the time. Temps hit over a hundred in the afternoon and yet I was comfortable in the coach all day long. Granted, the ACs ran all day and only shut down for short periods of time before restarting but they got the job done.

I have no issue with the AC set up.

Unlike heating where I'm not certain the bedroom thermostat does anything, when cooling the coach, the bedroom thermostat does control the AC unit over the bedroom.

Regarding the ceiling venting. You will find out, if you experiment, that the ceiling ductwork for the front and rear ACs are connected and that the units operate independently from the thermostats. If the rear AC is on but the living area AC is off you will feel cool air coming from the AC vents in the kitchen. Likewise, if the living AC is on and the bedroom AC is off you will feel cool air coming from the bathroom ceiling vents. So it is one network of vents/ductwork with two ACs connected.

I fiddled with opening and closing vents in an attempt to exercise some control over cool air flow. It's a work in progress. But again, I kept the coach down to 69 degrees in very hot weather (we were there about 5 days). I was happy with the service from the ACs and you know me, I get picky. One qualification.... Cindy was working in Dallas at the time and gone most of the day so it was just me and Miss Vivian (K9). I did run the living room DVR and TV though and they generate quite of bit of heat.

Roll
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