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General Discussion of preventative/corrective maintenance and other technical issues regarding your coach that are not covered in other Mechanic's Corner categories (ex. refrigerators, water heaters, and compressors).

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  #1  
Old 01-02-2009
Randy Dupree's Avatar
Randy Dupree Randy Dupree is offline
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Default aquahot thermostat

on my 95WB my center aquahot fan would cycle alot.
it would run for a few minutes and then stop,run and stop.
tonite we are in the coach and its doing the run and stop deal.
So i start looking at the thermostat and when the fan is running i have a draft on the T-stat,the fan is under the counter in the toe space,and the T-stat is across the coach on the wall.

now,where is that draft coming from?
the draft is blowing warm air on the T-stat,which makes it turn off the fan,with the fan off,the T-stat gets cold and calls for heat.

so,heres what is happening,the fan is blowing across the floor,under the dinette chair and the air then goes up the wall to the T-stat.
so,i simply put my blue box in front of the fan,and now the cycling has stopped.
boy,thats was easy!

except for the blue box sitting in the kitchen floor!
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2000 LXI 43
Bainbridge,Ga.
Port St Joe Fl.
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  #2  
Old 01-02-2009
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Quote:
Originally Posted by Randy Dupree View Post
on my 95WB my center aquahot fan would cycle alot.
it would run for a few minutes and then stop,run and stop.
tonite we are in the coach and its doing the run and stop deal.
So i start looking at the thermostat and when the fan is running i have a draft on the T-stat,the fan is under the counter in the toe space,and the T-stat is across the coach on the wall.

now,where is that draft coming from?
the draft is blowing warm air on the T-stat,which makes it turn off the fan,with the fan off,the T-stat gets cold and calls for heat.

so,heres what is happening,the fan is blowing across the floor,under the dinette chair and the air then goes up the wall to the T-stat.
so,i simply put my blue box in front of the fan,and now the cycling has stopped.
boy,thats was easy!

except for the blue box sitting in the kitchen floor!
Randy; Maybe you could put your thermostat inside one of those clear plastic boxes...with a keyed lock to keep others from tinkering with the setting. Would keep the wind off the T-stat but then you would have another key to keep track of. Just add a deflector or fairing near the T-stat.

Have you thought of renting some 'Wind Tunnel' up in Charlotte, NC...to test the wind flow chacteristics?
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1999 43 LXI Single Slide Body # F124510
2005 JEEP Liberty Limited CRD (diesel Toad)
SOLD 89 FC in 2012; SOLD 88 WB in 2016
Rolla, MO 65401
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  #3  
Old 01-02-2009
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Dick,everything was working fine until i got up around midnite and walked to the front of the bus,i found the blue box with my left toes!
dang,did that hurt!
what i really want to do is put a reostat on the fan,slow it down and quiet it up alot.
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  #4  
Old 01-02-2009
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Yes, a rheostat would work, but a diffuser would maybe work ever better.

The rheostat creates heat and just another load on electrical system.

Hope your toes are on the mend.

Happy New Year to you and Carol.

Dick & Patsy
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2005 JEEP Liberty Limited CRD (diesel Toad)
SOLD 89 FC in 2012; SOLD 88 WB in 2016
Rolla, MO 65401
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  #5  
Old 01-02-2009
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Quote:
Originally Posted by giderich View Post
Yes, a rheostat would work, but a diffuser would maybe work ever better.

The rheostat creates heat and just another load on electrical system.

Hope your toes are on the mend.

Happy New Year to you and Carol.

Dick & Patsy
Dick,

Brilliant minds think alike

Diffuser...Deflector...here what I have been working on, it is probably what you were thinking about.


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  #6  
Old 01-02-2009
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Dick,

Brilliant minds think alike

Diffuser...Deflector...here what I have been working on, it is probably what you were thinking about.
I'm sorry, I didn't read your post about the diffuser being on the thermostat, but either way would probably work.
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JOHN FINN
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1982 FC35RB
I'm NO EXPERT, but I did stay in the FINN'S INN EXPRESS last night
HOPKINS, SOUTH CAROLINA
VISIT THE FINN'S INN EXPRESS REMODELING ADVENTURE AND TECH. TIPS
I'M SO SLOW ON THE HILLS,THAT I GET TO SMELL THE FLOWERS AS I GO BY.....AND WATCH THEM GROW TOO!! NOT SO MUCH ANYMORE
Visit the WILD HARE RACING website
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  #7  
Old 01-02-2009
fxdwg fxdwg is offline
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Randy,

I'm thinking mine has a louvred cover over the heater. If yours does, why not tweak the louvers to slightly redirect the flow. I haven't yet used my heaters much, but don't remember mine short cycling.
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  #8  
Old 01-02-2009
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the short cycle may just be related to my coach,the relationship of the vent to the dinette and the t-stat make the problem i have.
ok,i need help on the "diffuser".
what are we talking about ?
'
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  #9  
Old 01-03-2009
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Default Aquahot Thermostat

Randy:

I think you have diagnosed the problem correctly. I have a 1996 WBPT42 and have the same problem. The thermostat is right across from the galley vent. I swapped out the thermostat from the bedroom and it did not help.

There is a little plastic radiation thing on the bottom of the cabinet by the thermostat with a little flat vane on it. This is a sensor for the thermostat. It was pointing forward and I turned it around pointing rearward and it helped, but sometimes, it still cycles too much. I have tried pasting cardboard dams around the sensor but this appeared to be ineffective. I am still experimenting.

FOX
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  #10  
Old 01-04-2009
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Fox,
That vane is for your inside thermometer below the generator panel to the left of the driver's seat. The thermostat sensor is in the thermostat itself.

Randy,
The diffuser I was speaking about is on the heater unit, but I forgot to look at mine yesterday to better describe it.
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