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Old 11-01-2018, 03:38 PM   #1
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Coach heat while driving

In summer, we run our roof top AC units while driving. What do we use for cold weather driving? Do we run our AquaHot system or rooftop heat pumps?
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Old 11-01-2018, 03:47 PM   #2
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In summer, we run our roof top AC units while driving. What do we use for cold weather driving? Do we run our AquaHot system or rooftop heat pumps?


Totally depends on how cold it is. Ive never needed anything but dash heat.
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Old 11-01-2018, 03:48 PM   #3
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In summer, we run our roof top AC units while driving. What do we use for cold weather driving? Do we run our AquaHot system or rooftop heat pumps?
Hopefully you will run the heat off the engine, we just set the heat to the Temp we want and as we drive the engine heat will heat the AH to keep the Coach Toasty - from one end to the other - even on the Coldest of Travel days - Added benefit is a long hot shower at the end of the drive.

Simple and Free,

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Old 11-01-2018, 07:47 PM   #4
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Don't mean to be flippant but you have several options and I agree, it totally depends on the weather and comfort needed. You have dash heat, AC heat pumps and aqua hot. One way or another you will be plenty warm. I wouldn't over think it.

Unless you are asking whether you can run the aqua hot while driving, if that is the question, they yes, absolutely.
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Old 11-01-2018, 08:07 PM   #5
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In summer, we run our roof top AC units while driving. What do we use for cold weather driving? Do we run our AquaHot system or rooftop heat pumps?
To summarize what others have said, here are your options...

Dash heat - probably the heater of first choice while driving down the road. Uses engine heat just like your heater in the car.
AquaHot system (using engine heat) turn off the diesel burner and AC heat elements and run your furnace/thermostat as normal. The engine will provide all the heat you need to the AquaHot and ultimately through the coach ducts. This is preferable when traveling in very cold weather in order to force heat into the water bay to protect it from freezing.
Rooftop units - I've never found a need to use them during cold weather driving.
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Old 11-01-2018, 09:41 PM   #6
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If your coach has the AH 450D, or 600D, you can just turn on your thermostat to 'furnace' mode, and get heat thru your AH, supplied from your engine. If that is still not enough heat, turn on the diesel burner switch on the AH.
You also have your dash heat, like any vehicle.
I wouldn't bother with generator running and heat pumps while traveling.
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Old 11-01-2018, 09:42 PM   #7
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On my ole Dutch Star/Spartan/Cummins if my wife wants it cooler I run the Onan Quiet Diesel generator and turn on both roof air conditioners. And, if I want more heat, I run the generator and plug in a couple of 1,000 watt box heaters.
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Old 11-02-2018, 04:11 AM   #8
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In summer, we run our roof top AC units while driving. What do we use for cold weather driving? Do we run our AquaHot system or rooftop heat pumps?
Yes, depending upon outside temperature. Heat pumps often do not work well below 38-40F. We however run the LP furnaces to keep the basement wet bay and water tanks from freezing.
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Old 11-02-2018, 05:03 AM   #9
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If your coach has the AH 450D, or 600D, you can just turn on your thermostat to 'furnace' mode, and get heat thru your AH, supplied from your engine. If that is still not enough heat, turn on the diesel burner switch on the AH.

You also have your dash heat, like any vehicle.

I wouldn't bother with generator running and heat pumps while traveling.


I have the 400D model, which does not have the engine connection. I would then need to use diesel burner switch. Do I need the generator running to operate the fans?
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Old 11-02-2018, 09:44 AM   #10
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AquaHot system (using engine heat) turn off the diesel burner and AC heat elements and run your furnace/thermostat as normal. The engine will provide all the heat you need to the AquaHot and ultimately through the coach ducts. This is preferable when traveling in very cold weather in order to force heat into the water bay to protect it from freezing.
Can you clarify this a bit as I have the AH 450D.

Are you saying to turn my controller to the HEAT SETTING, but then go to each ZONE and set them to OFF?

And I should leave both the DIESEL and ELECTRIC buttons off as well (the buttons that normally turn on the Aqua Hot)?

I assume leave the ENGINE PREHEAT off too? Or is that the circuit that actually gets used in this?
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Old 11-02-2018, 09:51 AM   #11
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On my ole Dutch Star/Spartan/Cummins if my wife wants it cooler I run the Onan Quiet Diesel generator and turn on both roof air conditioners. And, if I want more heat, I run the generator and plug in a couple of 1,000 watt box heaters.
I'm thinking along your lines. I have a 2002 and I run box fans along with the roof airs in summer. The March trip we are planning I'm thinking a 1500 watt heater to help heat the coach along with the dash heater.
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Old 11-02-2018, 10:22 AM   #12
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I have the 400D model, which does not have the engine connection. I would then need to use diesel burner switch. Do I need the generator running to operate the fans?
Everything is 12 volt with exception of the electric heating element. The diesel burner, circulation pumps, and fans are all 12v. Should not be a need for generator, engine alternator should keep up no problem unless it is not charging the house batteries for some reason.

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Can you clarify this a bit as I have the AH 450D.

Are you saying to turn my controller to the HEAT SETTING, but then go to each ZONE and set them to OFF?

And I should leave both the DIESEL and ELECTRIC buttons off as well (the buttons that normally turn on the Aqua Hot)?

I assume leave the ENGINE PREHEAT off too? Or is that the circuit that actually gets used in this?
Leaving your aqua hot switches ON is no problem. The electric one wont matter if you're not plugged in. Diesel will fire as needed and/or engine will provide also if equipped, you won't really notice. It hurts nothing to run the diesel burner going down the road if it needs extra heat. Thermostats set to furnace mode, set your temp and go. Coupled with dash heat you should be plenty toasty throughout the coach.
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Old 11-02-2018, 10:39 AM   #13
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Leaving your aqua hot switches ON is no problem. The electric one wont matter if you're not plugged in. Diesel will fire as needed and/or engine will provide also if equipped, you won't really notice. It hurts nothing to run the diesel burner going down the road if it needs extra heat. Thermostats set to furnace mode, set your temp and go. Coupled with dash heat you should be plenty toasty throughout the coach.
Forgive my "slowness"...

OK on most of this - just want to clarify about the setting of the GAS/ELECTRIC/OFF choice and whether it matters?

Normally, on my system I have 3 options for each zone - OFF, GAS, or ELECTRIC. Electric makes my roof Heat Pumps come on. Gas makes the AH furnace come on (if it is set to DIESEL or ELECTRIC)

Or do I set the zones for GAS and if I leave the DIESEL and ELECTRIC buttons off that the engine will provide the AH heating?

I do have the feature where the AH preheats my motor, so I am trying to understand if that is the circuit that will somehow heat the coach too (without the DIESEL button being on)?

Sorry for the micro questions, but I am hoping to fully understand the system so I use it correctly... and can troubleshoot correctly should there be an issue.
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Old 11-02-2018, 11:24 AM   #14
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I have the 400D model, which does not have the engine connection. I would then need to use diesel burner switch. Do I need the generator running to operate the fans?
No, you won't need your generator for the AH fans. They are 12V.
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