Hydro Hot

[alpine4us]

Has anyone relocated the fan coil units in their coach? I want to move one of the fan units and will have to drain the system. When refilling the boiler unit with coolant is their a specific procedure that must be followed? Will any air bubbles work themselves out?

Larry
2004 40ft MDTS

[Basil Shannon]

There will be a bleeding procedure in the installation manual for your model HH. Aqua-Hot Heating Systems Inc.

I wonder if it is really necessary to drain the system for what you want do do (extend the lines to one heater). Seems like the circulation pump would push the air in the line extensions back into the tank.

[bravone]

I have a 2004 Monaco Signature with an aqua hot heating system. I goofed and did not adequately winterize the unit. Whan I pressured up, water flowed out from the bottom of the unit. The RV dealer says my domestic water coil froze and cracked. They claim that Aqua Hot doean't repair these units andf that I have to buy a new or refurb unit. Is this true? They are quoting $9000+ for the repair / change out. Any other solutions? Does anyone have a good photo of the inernals of an aqua hot unit?
Thanks

[Wayne R]

Bravone, Join the yaho group at Yahoo! Groups: Search Results and do a search. I have read where some have replaced the fresh water heat exchanger. Not an easy job but it can be done. You have to cut the tank open replace the coil using heat transfer paste and have the tank welded shut.

If you do replace your Aqua Hot salvage all the parts you can. They are very pricey and worth the time to take off.

[EngineerMike]

Bravone- Welcome to iRV2!

I've heard $6,750 to buy the aquahot unit, so $9g to do the full replacement would be in the ballpark. I'm w/Wayne- that's enough tookies that I'd see if the unit is actually repairable instead. That'll mean taking the unit out (gotta do that anyway), then disassembling (added work, basically a crapshoot on whether a repair will make you money, and probably not much out of pocket compared to the overall job; if it comes to naught you haven't wasted much effort). If the repair turns out to be risky or not manageable, then you will be buying a new one anyway.

Also, might do a google search on RV Salvage and follow up w/the vendors to see if anybody has a wrecker w/the HHot or AHot to sell.

[Old Rv'er]

See this link he might be able to help you. Just had mine serviced, tech told me, AH is/are having some bad nozzels come through, mine smokes worse than ever. Headed to AH school in may, I will ask them for a new nozzel and change it while I'm at their facility to make sure it works correctly.

RV Hydronic Heater Repair - Home

[Wayne R]

Old, Roger is a great tech, I met him at the balloon festival. His Yahoo group on Hydronioc heating is also very helpful.

Roger told me how to make a fuel pressure gauge on the cheap. Just drill and tap an old nozzle and install a gauge. My Smokey unit turned out to be low fuel pressure and a leaky fuel solenoid. It has run extremly clean for about a year now.

[EngineerMike]

I was getting some smoke from mine since new. Orman Claxton did my service @ Qzite in January, and the new nozzle fixed it.

[Wayne R]

Quote:

Originally Posted by EngineerMike I was getting some smoke from mine since new. Orman Claxton did my service @ Qzite in January, and the new nozzle fixed it.

Mike did he check the fuel presure? It is usually part of a service or so I have been told. Mine was low at about 138 PSI

[Old Rv'er]

Woudl like to see the guage in a picture so I fully understand how to put it together, however, I don't think the pressure is the issue. I might mess with the air shutter some, but will wait until I hit the school in Colorado.

[Wayne R]

Old, for your viewing pleasure. Fuel pressure does make a difference. I have found the air shutter makes little difference in smoke level. It does change the sound and velocity/amount of air entering the combustion chamber. It also affects CO2 levels which is what the adjustment is for.
Every time I mess with mine I end back at the factory setting. The point where the paint dot is.
Let us know what you find out in school.








Another useful DIY tool for HH owners.

[EngineerMike]

Wayne-
You are a project-box animal.

[Wayne R]

What can I say I have more time then money these days. These HH's are really not that complex. Aqua Hot wanted $1100 dollars for thier test box and it does not have a built in volt meter. I have about $50 in mine.