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10-25-2012, 08:24 PM
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#1
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Member
Join Date: Jan 2011
Location: Abbotsford B.C. Canada
Posts: 41
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aqua hot
have a question? I have aqua-hot in a 2002 mountainaire. I have to make a trip with it and I have already drained and blown out the water system. Can I run the aqua-hot for heat without water in the system? thankx Doug
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10-25-2012, 11:01 PM
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#2
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Senior Member
Join Date: May 2011
Location: Dayton, Ohio
Posts: 823
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Yes, aqua-hot circulates its own fluid through lines to your coach heater units.
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[COLOR="Blue"]Doug, Robyn, Ross & Ryan
06 Travel Supreme Select 45'
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10-26-2012, 02:25 AM
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#3
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Moderator Emeritus
Country Coach Owners Club Appalachian Campers Gulf Streamers Club
Join Date: Mar 2000
Location: Chattanooga, Tn.
Posts: 12,060
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Just don't turn on the electric heating element and you will be fine.
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Mike, RVIA & RVSA Certified Master RV Technician
Amy, Dr. Assistant - Roxie & Mei Ling, four legs each
2000 Gulf Stream Scenic Cruiser 450 hp & 1330# torque
06 Saturn Vue, 06 Chevy Z71 4x4 & 2014 Corvette Z51 M7
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10-26-2012, 08:14 AM
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#4
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Senior Member
Join Date: May 2011
Location: Dayton, Ohio
Posts: 823
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Why would it matter whether you use the diesel/propane burner to heat the aqua-hot fluid or its electric element?
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[COLOR="Blue"]Doug, Robyn, Ross & Ryan
06 Travel Supreme Select 45'
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10-26-2012, 08:19 PM
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#5
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Senior Member
Commercial Member
Join Date: Apr 2007
Posts: 183
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You may use the heating system of your Aqua-Hot (both diesel and electric) with no limitations with water drained.
You do not get all of the water out of your Aqua-Hot by draining or blowing it out. If there is any water in the lines that is allowed to freeze, it will severely damage your Aqua-Hot. Only approved method is to completely fill the water system (and Aqua-Hot) with RV water line antifreeze.
- Roger Berke -
www.Forum.RVHYD.com
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10-26-2012, 11:37 PM
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#6
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Member
Join Date: Jan 2011
Location: Abbotsford B.C. Canada
Posts: 41
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thanx Roger. it is the domestic side that I am concerned with.
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10-27-2012, 02:36 AM
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#7
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Moderator Emeritus
Country Coach Owners Club Appalachian Campers Gulf Streamers Club
Join Date: Mar 2000
Location: Chattanooga, Tn.
Posts: 12,060
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Quote:
Originally Posted by Roger Berke
You may use the heating system of your Aqua-Hot (both diesel and electric) with no limitations with water drained.
You do not get all of the water out of your Aqua-Hot by draining or blowing it out. If there is any water in the lines that is allowed to freeze, it will severely damage your Aqua-Hot. Only approved method is to completely fill the water system (and Aqua-Hot) with RV water line antifreeze.
- Roger Berke -
www.Forum.RVHYD.com
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Roger,
Is the heating element in the engine block heater circuit? I was thinking it was in the potable fresh water tank, similar to a electric/gas water heater.
__________________
Mike, RVIA & RVSA Certified Master RV Technician
Amy, Dr. Assistant - Roxie & Mei Ling, four legs each
2000 Gulf Stream Scenic Cruiser 450 hp & 1330# torque
06 Saturn Vue, 06 Chevy Z71 4x4 & 2014 Corvette Z51 M7
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10-27-2012, 06:23 AM
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#8
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Senior Member
Join Date: May 2011
Location: Dayton, Ohio
Posts: 823
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Quote:
Originally Posted by fulltimeraye
thanx Roger. it is the domestic side that I am concerned with.
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Roger's answer covered your original question:
Quote:
Originally Posted by Roger Berke
You may use the heating system of your Aqua-Hot (both diesel and electric) with no limitations with water drained.
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But then he went on to cover another point:
Quote:
Originally Posted by Roger Berke
You do not get all of the water out of your Aqua-Hot by draining or blowing it out. If there is any water in the lines that is allowed to freeze, it will severely damage your Aqua-Hot. Only approved method is to completely fill the water system (and Aqua-Hot) with RV water line antifreeze.
- Roger Berke -
www.Forum.RVHYD.com
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This second point describes the problem of draining your fresh water system, but not being able to empty the loop of fresh water that sits inside the Aqua-Hot unit. So even though the Aqua-Hot's own boiler fluid has antifreeze (it should!), that small loop of fresh water in the Aqua-Hot waiting to be heated when demanded by turning on a hot water faucet cannot be emptied by draining the fresh water system---and Roger says it cannot be emptied even by blowing out the fresh water lines.
RV Wizard: the Aqua-Hot electric heating element is in the Aqua-Hot's own boiler tank. Using it or using the diesel burner would heat the Aqua-Hot's boiler fluid, to enable "furnace" function in the coach or to enable engine preheat function. It would also keep from freezing that loop of fresh water that is captive in the unit!
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[COLOR="Blue"]Doug, Robyn, Ross & Ryan
06 Travel Supreme Select 45'
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10-27-2012, 08:14 AM
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#9
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Senior Member
Commercial Member
Join Date: Apr 2007
Posts: 183
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Quote:
Is the heating element in the engine block heater circuit? I was thinking it was in the potable fresh water tank, similar to a electric/gas water heater.
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The electric element is actually in the boiler coolant. That is one reason why the electric elements so seldom fail.
Diesel burner and or electric element heat the boiler coolant. Water flows through copper coil and is heated. This copper coil is what we are concerned about freezing.
- Roger Berke -
www.Forum.RVHYD.com
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10-27-2012, 01:47 PM
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#10
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Senior Member
Join Date: Dec 2011
Posts: 134
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I do not intend to hijack the thread but I do have an aquahot question and my phone will not cooperate in starting a new thread today.
I turned on the diesel aquahot for our showers today and when the diesel burner kicked off the rest of the system did not kick off in a minute or so as it usually does.
It stayed on even after I pushed the button to turn the whole thing off. The light went out but the sound continued.
After 10 minutes or so I pushed the button on and off about three times and the sound stopped.
It won't be long and I will need to leave the system on overnight and some days for heat so I need to figure this out.
Any ideas?
Thanks
DKO
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DKO
Home is where you go when there's no place else to go!
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10-27-2012, 07:51 PM
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#11
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Senior Member
Commercial Member
Join Date: Apr 2007
Posts: 183
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When the diesel burner in your Aqua-Hot shuts off (either it comes to temperature or you turn the diesel switch off in the coach), the motor should run for 2-3 minutes as a purge or cool down cycle.
When it gets to the end of the purge cycle, the motor should just stop. The exact time is not important. Some boxes will run a little longer.
When the motor does not stop or tries to stop (motor speed varies) it is usually the silver box that is attached to the Webasto inside of the Aqua-Hot. When it is not shutting down properly, you can put your hand on the box and feel the relays inside clicking.
If you provide the model number of your Aqua-Hot, I will post photo showing what to look for.
If the box will not shut down, you can remove, then reinstall the smaller of the two plugs from the bottom of the box. That will reset the box and force it to stop.
- Roger Berke -
www.Forum.RVHYD.com
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10-27-2012, 10:19 PM
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#12
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Senior Member
Join Date: Dec 2011
Posts: 134
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Thanks Mr. Berke. I will try to post the model # sometime Sunday and crawl in a have a close up look on Monday.
We turned it on again Saturday evening and it kicked off just fine at the end of the cycle.
DKO
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DKO
Home is where you go when there's no place else to go!
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10-28-2012, 08:11 AM
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#13
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Senior Member
Join Date: Dec 2011
Posts: 134
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Operators Manual says Model #920431/432
DKO
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DKO
Home is where you go when there's no place else to go!
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10-28-2012, 08:57 AM
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#14
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Senior Member
Commercial Member
Join Date: Apr 2007
Posts: 183
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Control box is shown in photo.
Sometimes box will become intermittent.
Unfortunately the control box is the most expensive component on the Webasto. Aqua-Hot part number is WPX-287-962. There are several online parts sources. Search for "RV Hydronic Heater Parts".
- Roger Berke -
www.Forum.RVHYD.com
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