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Topic: Aquahot,have heat, but..burner will not kick on for maintaining shower hot water (Read 901 times) previous topic - next topic

Aquahot,have heat, but..burner will not kick on for maintaining shower hot water

The electric tries but not big enough element, furnace portion works ok, but when taking shower the burner will not sense that the hot water for shower is needed..is there a temp sensor going bad or ?
thnx

red
'02 40' U320t  4010WTFS Build 6036 1 slide
Motorcade # 17841
SKP 151920
Retired truck driver
 5 million miler
Still have itchy feet for travel

Re: Aquahot,have heat, but..burner will not kick on for maintaining shower hot water

Reply #1 –
The diesel burner has a control thermostat just for the burner.  It is located above the burner behind a plate.
Rudy Legett
2003 U320 4010 ISM 450 hp
2001 U320 4220 ISM 450 hp
1995 U320 M11 400 hp
1990 Granvilla 300 hp 3208T
Aqua Hot Service Houston and Southeast Texas

Re: Aquahot,have heat, but..burner will not kick on for maintaining shower hot water

Reply #2 –
Quote from: Rudy –
The diesel burner has a control thermostat just for the burner.  It is located above the burner behind a plate.
OK, The furnace(coach heat) portion works good,burner kicks on and off as it should.. keeps coach comfy in 20 deg weather.
The hot water side is another story. burner will not kick on to keep the hot water hot.
So ... is there  2 control thermostats? one for the furnace/coach heat side and another one for the hot water supply?
Or just mebbe I have a loose connection @ the little panel with the 3(?) sensors... will have to check when the temps get above freezing
'02 40' U320t  4010WTFS Build 6036 1 slide
Motorcade # 17841
SKP 151920
Retired truck driver
 5 million miler
Still have itchy feet for travel

Re: Aquahot,have heat, but..burner will not kick on for maintaining shower hot water

Reply #3 –
Same thermostat for heat and water. You might have a tempering valve issue. Wait for Rudy to give information on how to troubleshoot. I had one go bad on my Monaco.
1999 40 ft. U-320 wtfe build 5563 Chuck & Lynda's "Rollin' Inn"  2030 watts solar
prev. mh's 71 GMC 5 yrs. 73 Pace Setter 1 yr. 78 Vogue 5 yrs 81 FTX 40ft all electric 18 yrs. 1996 Monaco Signature 3 yrs.
2014 Grand Cherokee Overland
Dream as if you will live forever. Live as if you will die today.  James Dean

Re: Aquahot,have heat, but..burner will not kick on for maintaining shower hot water

Reply #4 –
Saddlesore,

Did you check to make sure there is enough flow on the hot water side as it might be plugged up? You may have enough heat so the burner won't kick on. Sometimes its good to periodically clean all the buildup of mineral deposits out of the hot water line. A good water filter really helps out with this issue.
'The strength of the effort is the measure of the result'
1995 U320SE
40'
#4740
#17648

Re: Aquahot,have heat, but..burner will not kick on for maintaining shower hot water

Reply #5 –
Quote from: cubesphere –
Saddlesore,

Did you check to make sure there is enough flow on the hot water side as it might be plugged up? You may have enough heat so the burner won't kick on. Sometimes its good to periodically clean all the buildup of mineral deposits out of the hot water line. A good water filter really helps out with this issue.
Have plenty of hot water side flow.. think I may have a bad thermostat or I didn't get a wire on correctly/or pushed on like it should be.. too cold to "get after it" for a few weeks.
@ the S & B, so no rush
'02 40' U320t  4010WTFS Build 6036 1 slide
Motorcade # 17841
SKP 151920
Retired truck driver
 5 million miler
Still have itchy feet for travel

Re: Aquahot,have heat, but..burner will not kick on for maintaining shower hot water

Reply #6 –
If burner works good for heating, it should also for hot water.  My best guess would be mixing valve issues.
Rudy Legett
2003 U320 4010 ISM 450 hp
2001 U320 4220 ISM 450 hp
1995 U320 M11 400 hp
1990 Granvilla 300 hp 3208T
Aqua Hot Service Houston and Southeast Texas

Re: Aquahot,have heat, but..burner will not kick on for maintaining shower hot water

Reply #7 –
Are you using a low flow shower head like Oxygenics?  Are you using the water tank or city water?  We get this question every year when entry water temp drops.
Regards,
Brett

'99 42' Foretravel Xtreme
'14 Brown Motorsports Stacker
'05 Chevy SSR
'02 BMW R1150R

Re: Aquahot,have heat, but..burner will not kick on for maintaining shower hot water

Reply #8 –
To add to what was posted the aqua hot adds 55 degrees to whatever inlet water temps is run through it
"Riding and rejoicing"
Bob
1997 U320 40' Mid entry, build 5132,  wtbi ce27, 4th owner
2007 Solara convertible
2 prodeco tech outlaw ss electric bikes

1095 watts solar
08 Ls 460 and a sc430
2000 Ford F-250 superduty 4x4

Re: Aquahot,have heat, but..burner will not kick on for maintaining shower hot water

Reply #9 –
Quote from: Caflashbob –
To add to what was posted the aqua hot adds 55 degrees to whatever inlet water temps is run through it
Not quite Bob.
The thermostats are set for 180 on the burner and 190 on electric. The lower inlet temperature just slows the process down. If you had 40 deg inlet 95 deg wouldn't heat the coach.
1999 40 ft. U-320 wtfe build 5563 Chuck & Lynda's "Rollin' Inn"  2030 watts solar
prev. mh's 71 GMC 5 yrs. 73 Pace Setter 1 yr. 78 Vogue 5 yrs 81 FTX 40ft all electric 18 yrs. 1996 Monaco Signature 3 yrs.
2014 Grand Cherokee Overland
Dream as if you will live forever. Live as if you will die today.  James Dean

Re: Aquahot,have heat, but..burner will not kick on for maintaining shower hot water

Reply #10 –
Quote from: craneman –
Not quite Bob.
The thermostats are set for 180 on the burner and 190 on electric. The lower inlet temperature just slows the process down. If you had 40 deg inlet 95 deg wouldn't heat the coach.

Think this is what Bob is trying say. Following is from Rudy a couple of years ago:


The electric heating element in the heater is 1650 watts or 5000 BTU.  The diesel burner is 50,000 BTU or ten times more heating capacity.

The electric element will heat the coach till the outside temp gets to about 50 F. Below that you may need to turn on the diesel especially if you are using heat from the heater for something else such has washing dishes not to mention a shower.

The electric element is not rated to provide long hot showers but the diesel burner is.  So, when showering or heating in cooler to cold temps, run the diesel burner.

The temp of the hot water is controlled by the tempering valve located below the burner.  Turning the knob in (righty tightly) makes the hot water at the shower cooler.  I set the tempering valve to 115 to 120 degrees F.

The hot water spec is 55 degree F temperature rise at 1.5 gallon per minute flow.  If you are using ground water that is 40 degrees F, you will only get 95 degree F hot water which will feel cool to you.

To get around that situation, fill coach's fresh water tank full and set basement thermostat all the way up.  Next morning the tank will be 50 degrees F or better and by running off the coach's tank you will get a hot shower.

Hope this helps.
More...Like Quote
Rudy Legett
1995 U320 M11 400 hp
Aqua Hot Service Houston and Southeast Texas
Jim C.
coachfree, previous 1997, 1999, 2000, and 2003 Foretravels.

Re: Aquahot,have heat, but..burner will not kick on for maintaining shower hot water

Reply #11 –
The antifreeze circuit is separate from the water heating circuit as far as I know.  The external copper tubing around the main tank contain water.  The tank itself contains antifreeze
"Riding and rejoicing"
Bob
1997 U320 40' Mid entry, build 5132,  wtbi ce27, 4th owner
2007 Solara convertible
2 prodeco tech outlaw ss electric bikes

1095 watts solar
08 Ls 460 and a sc430
2000 Ford F-250 superduty 4x4

Re: Aquahot,have heat, but..burner will not kick on for maintaining shower hot water

Reply #12 –
I see where the 55 deg. number is for continuous flow. Since we never have hooked up to outside water it has never come into play. I don't know the capacity of the copper tubes which contain the water but if it is a reasonable amount, the outside water would only come into play on a very long shower. I have the tempering valve set at 120
1999 40 ft. U-320 wtfe build 5563 Chuck & Lynda's "Rollin' Inn"  2030 watts solar
prev. mh's 71 GMC 5 yrs. 73 Pace Setter 1 yr. 78 Vogue 5 yrs 81 FTX 40ft all electric 18 yrs. 1996 Monaco Signature 3 yrs.
2014 Grand Cherokee Overland
Dream as if you will live forever. Live as if you will die today.  James Dean