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Old 02-22-2015, 08:30 PM   #11
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Use mine in winter. Use a light bulb (100 w) in water pump store box and also one in water manifold compartment
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Old 02-22-2015, 08:31 PM   #12
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Coach main furnaces do not heat those areas
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Old 02-22-2015, 08:55 PM   #13
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Coach main furnaces do not heat those areas
Your rear furnace on a 390BH does heat the water bay. If you remove the top white board from the right side inside the water pump access door and look above the black and gray tanks, you will see a small pipe coming down from the heat chase. As a matter of fact, that is the only heat drop into the bottom compartments. On a BH with split furnace, the is no duct opening in the front lower compartments.
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Old 02-22-2015, 09:02 PM   #14
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My pump had frozen in temps below 15. Had to use light bulb to heat that area
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Old 02-22-2015, 09:05 PM   #15
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My water manifold is on opposite side of coach from where the pump is mounted
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Old 02-22-2015, 10:39 PM   #16
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Here was my solution. I also had a heater on the manifold side. I was able to turn them on or off going down the road using the two red switches on the dash. The door on the pump side does not seal well because the two rubber mounts prevent the seal from making hard contact. I thought I had a picture of the heat duct but I cannot find it.
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Old 02-22-2015, 10:47 PM   #17
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-5f in Green River, Utah 2 years ago. The slides are in because we were just about to leave, but all 4 were out all night. With just the furnaces running we had no problems with freezing pipes (no wind). However, the hot water inlet line froze before we made it half way to Denver.
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Old 02-23-2015, 05:40 AM   #18
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Did you install the switches on dash? What voltage is running the heaters?
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Old 02-23-2015, 05:59 AM   #19
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You didn't mention how you winterize. If you blow out your lines and then add antifreeze throughout the system, just use that to flush your toilet and use the campground facilities to bathe.

We leave our rv at our lake property here in NJ year round. ( wind chills have been below 0* lately ) I blow out the lines, add antifreeze to the system and if we go down for a day trip, we can still flush the toilet by running a pump line to a gallon of antifreeze. We never drink water from the holding tank anyway, so that is not an issue.

Good luck on your trip back to the frozen zone,
Don
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Old 02-23-2015, 11:49 AM   #20
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Did you install the switches on dash? What voltage is running the heaters?
I installed the switches. The top black one operates the drivers side map light I installed and the 2 bottom ones with the red lights operate the switched outlets in the storage bays on either side of the coach. They are 12V switches controlling 120V outlets. The heaters are standard 1500W, 120V Sunbeam portable heaters.

To tmmar's original question, if the temp is above freezing while you're driving, I don't think there is much of an issue. Run the rear furnace and use an extra cord and drop a trouble light with a 100W incandescent bulb next to the pump or manifold overnight. If your driving in temps below freezing for more than about 3 hours, my opinion is that you'll never add enough heat to keep the lines from freezing. In that case, if it were me, I'd blow the lines out using the on board air and run pink antifreeze from the pump through the drain valve on the cold water manifold. (Unfortunately there is no easy way to blow out the water in the pump and cross over line between the pump and cold water manifold.) Then once you get to your overnight area you could flush the pink and recharge the system, fairly quickly. Had I not traded the Berk, my next project was to plumb an air fitting into the water bay. That way I could easily blow out the water system each morning.
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