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Old 01-18-2011, 10:19 AM   #1
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Batteries won't run Furnace

My furnace unit is a hydro-flame 8535 III.
My batteries are fully charged, but will not spin the blower fast enough to cause the furnace to light. There is a squeal when the furnace blower comes on. As soon as I plug into shore power, the furnace lights. The blower needs to either be lubed or replaced. Does anyone know if I can get to the blower without taking out the entire unit.
Any hints as to what needs to be removed to get the unit out will be greatly apprecitated.

Charles
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Old 01-18-2011, 11:07 AM   #2
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Good info on this here.
http://www.airforums.com/forums/f313...per-70157.html

Sounds like the bearings are going on the motor??? How old is it? The motor will need replacement if it is the bearings. Otherwise it is touching something.

Dave

Also, manual can be downloaded from the Atwood site. All 8500 III series are much the same, with series IV an improved version that fits the same hole.
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Old 01-18-2011, 11:28 AM   #3
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Not sure of the Hydro Flame model # but when mine started squealing I took it out put it on the bench and could not make it squeal reinstalled that was 2 years ago and have no problems since.

Since the bearings seemed to be good I assume something was rubbing but have no idea what.

Not a big deal to get out you can down load the manual but basically you shut off the gas, disconnect the gas line, remove a few wires to the control board, remove the outside input/exhaust and I think there were 2 screws into the floor at the front.

It also sounds like you need to check the cables at the battery if OK have the battery load tested.
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Old 01-18-2011, 12:29 PM   #4
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Dave,
I assume the motor is the original that came in the Airstream. If that is the case, it is @ 15 years old. I will try and download a manual from Atwood.
Thanks
Charles
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Old 01-18-2011, 01:02 PM   #5
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If your furnace has had a normal amount of use in that 15 years it almost certainly will need a new motor. Be prepared to spend about $130 to $150 or more just for the motor and unless you are very mechanical inclined don't attempt to replace it yourself. I have replaced many of them and it can be a bit tricky, from pulling the furnace to tearing it apart and replacing the motor. Also while you have it apart inspect the burner as they tend to deform and start breaking apart. Clean out all debris and mud dobber nests while you are at it. I have even found mouse nests and dead mice trapped in them. Not very healthy to have that stuff blowing through your vents.
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Old 01-18-2011, 01:48 PM   #6
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Quote:
Originally Posted by 6PackCharlie View Post
Dave,
Quote:
Originally Posted by 6PackCharlie View Post
I assume the motor is the original that came in the Airstream. If that is the case, it is @ 15 years old. I will try and download a manual from Atwood.
Thanks
Charles


I have sent you a PM. Check your mail.
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Old 01-31-2011, 09:00 PM   #7
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I took the blower motor out of the furnace and lubed the bearings. Ran it on the bench and no squeak. Put the furnace back together and the batteries still won't run the furnace (no squeak). I can put my battery charger onto one of the batteries and the blower rpm's noticibly increase and the furnace lights. The same thing happens if I add a third battery (or plug into shore power). The batteries are fully charged, just won't spin the blower fast enough to get it to light.
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Old 01-31-2011, 09:26 PM   #8
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In that case sounds like the batteries. Try disconnecting the trailer batteries and using only the third battery. Should work off one battery. Not all trailers come with two batteries.
Al
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Old 01-31-2011, 09:56 PM   #9
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According to my tester. The batteries are fully charged.
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Old 01-31-2011, 10:18 PM   #10
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Charles

There are are only three possible source of the problem:

1) batteries
2) blower motor
3) everything else

Get thee a voltmeter thou canst trust.

Measurest the voltage at thy battery whilst thy furnace is running.

Should the voltage measure below 12.7 volts, replacest thy batteries as the source of the problem is: 1) batteries.

Otherwise, measurest the voltage at thy furnace. Should the voltage measure above 12.0 volts, repleacest thy blower motor, for its bearings are faulty and it is serviced as an assembly.

Finally, should the voltage at thy batteries be above 12.7 volts and the voltage at thy furnace below 12.0 volts, despair is your lot, as thy 12 volt distribution wiring has contracted the vapors.
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Old 01-31-2011, 10:58 PM   #11
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I will check those locations as soon as the wind chill get back above below zero. Thanks.
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Old 01-31-2011, 11:10 PM   #12
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Another thing to verify is that there are no corroded connections between your batteries and the blower motor. This could be a dirty battery terminal, corroded switches, or corroded connectors in the wiring where wires connect to a switch or a terminal block.

Also, kinks in the wires as they pass through various areas / sections / wall panels might allow leaks to ground dropping final voltage.

Last thing that I can imagine that might happen is if the mounting of the heater casing or motor mounts is skewed or twisted somehow, excessive friction could impede the freedom of the fan.

Hey, it ran on the bench: what's the difference between your bench and in the TT? Answer: the power supply (you didn't use the trailer's power to bench test it, did you?) and the mounting.

Good luck and good hunting!
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Old 01-31-2011, 11:39 PM   #13
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Voltage drop.

I agree with Aage. I think you have a voltage drop problem caused by lose or dirty corroded connections. If the motor does not have a separate ground wire then it must be grounded thru the frame of the furnace. Make sure there is a ground wire running from the frame of the furnace to the skin of the trailer.
When you connect the shore power cable, the battery charger and or converter will take the voltage to somewhere around 14 volts.
The battery voltage alone won't be that high, only around 12.5 that addtional 1.5 volts is probably why it works. The motors speed is directly proportional to the voltage. The higher the voltage the faster it will run.
What kind of tester are you using to test the batteries?
With the blower running check the voltage at the batteries (in the battery only mode) then go to the blower and test the voltage there.
Then turn the furnace off and check the voltage at both places.
Let us know what you find.
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