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Cold weather questions

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Jerry Emert:
First excuse my newbie like questions. I’ve owned this coach since 2014 and I’m proud to say I’ve avoided freezing weather…until now!  Looks like I will have two days of freezing weather before I can get back to Florida.
A couple days ago the charger function and the 115 pass through section have quit working so I’m depending on an outside 30 amp charger to keep the house batteries charged because the inverter function still works. I’ve tried the hard reset with neg results so it’s beyond my capability at this time. My furnace (hydohot) has never worked even though I’ve had it repaired at least 3 times in the last 11 years.
I have a couple of space heaters to keep the coach warm. I also have a very small space heater in the water tank area. All plugged into extension cords
That’s my sad story now the newbie questions. My biggest concern is the hydro hot. With the electric heating and or the diesel side turned on can the Hydrohot freeze? My logic brain says no but my Florida man allergy to cold says better check with the experts.
Thanks in advance.
Jerry
What other big concerns would you have?

David T. Richelderfer:
A couple of questions:
1. How cold is the freezing weather and what is the expected wind speed hitting the coach?
2. What kind of pass-through charger does your coach have - BIRD/Big Boy?
3. What does not work on the HydroHot - diesel burner, electric element, or both, or is something else not working?

My comments to:
1. A few degrees below freezing for a few hours, like overnight, especially without wind, is not a problem.  A few space heaters would do the trick.  Otherwise, 5 to 10+ degrees below freezing for more than overnight is a problem.
2. Our Big Boy was acting up a few years ago.  My nephew and I removed it, opened it up and cleaned it thoroughly, put new di-electric grease in it, and it has worked well since.  Last year, I found the two 12v engine batteries low.  We reset the BIRD by turning it OFF and back ON to fix that problem.  I was told BIRD modules are notoriously problematic.
3. Our AquaHot has been a problem over the years too.  I have replaced the igniter module a couple of times, the controller a couple of times, the electric element once, etc.  Three years ago, the technician replaced the controller... and that did not fix the problem... which I learned after leaving the area.  Last year, after two years of not igniting the diesel burner, the igniter module was replaced. The AquaHot has since worked flawlessly.

Fred Brooks:
   Jerry,
 I would agree with David, A hard freeze is 10 degrees below 32 degrees for 10 to 12 hours sustained. If the Hydrohot is not working on diesel or 120 volt electric, here are some considerations. The wabasto heater inside the Hydrohot has a direct path to fresh air directly below the unit. This could cause serious damage to the fresh water coils inside the boiler unit. If you do not intend to repair the Hydrohot, I would turn off circuit breaker #8 and have the unit drained per the owners manual. If just temporary, prop up a pillow to cover the air intake that was previously mentioned and continue to use your space heaters. Enjoy Florida! Fred

Eric Maclean Co-Admin:
Jerry
All of the above are good ideas to help mitigate the cold weather freezing your hot water loop in the Aquahot/ Hydrohot .
Another method is to keep a small amount water moving through the unit of course that will use water and tank space if not on full hookups.
The only true way to be safe is to winterize the domestic hot water loop in the Aquahot with plumbing antifreeze.

Without winterizing your best bet is to get the electric side of your AquaHot or Hydrohot up and working that will provide the heat needed to keep the hot water loop from freezing.

Eric

Eric Maclean Co-Admin:
Jerry
For your inverter charger problem (not charging and no pass through)

1st.  check your 120 volt breakers there should be a 30 amp breaker which provides power to the inverter if the breaker is ok check for power input into the           inverter at the inverter.
2) while your down at the inverter check to see if there is a pop pin type breaker on the side of the inverter that is popped out .

3) inside the inverter there is what is known as a pass through relay ( these relays spend most of there lives in one position or the other and can sometimes get stuck) this is when a good swift hit to the side of the inverter may be all it takes to jar the relay loose and restore normal operation.

Caution : although it may be tempting do not feed power into the output side of the inverter for any reason as this will damage the inverters internal electronics.

Eric

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