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p5200 03-02-2011 09:33 PM

mobile home furnace wires keep burning off
 
Hi, this problem has been going on for a while. The wires keep burning off at the crimp on spade connectors at the sequencer or, element connectors and also the furnace breakers which are in the unit. I'm pretty sure the wiring has been replaced with wire that's not suitable for the temps. Also does it matter if the crimp on spade connectors are aluminum and the wire is copper? Also, the sequencer has had to be replaced about three times. There is no info anywhere telling what brand it is or anything even the repairmen who replaced the A coil could not find any model number etc. Thanks for all info! :)

beenthere 03-03-2011 04:34 AM

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Under sized wire, and connectors that are not rated for high temp often do/cause this. Older units required high temp wire and connectors, newer units don't.

hvacguytn615 03-03-2011 06:45 AM

if you have a clamp on amp meter check your amp draw 21 to 22 is about as high as most mobile home units are rated if under 21 amps and you are sure the wireing is the the right size an type you may need to have an electrican check main panel

p5200 03-03-2011 08:45 AM

Quote:

Originally Posted by hvacguytn615 (Post 601550)
if you have a clamp on amp meter check your amp draw 21 to 22 is about as high as most mobile home units are rated if under 21 amps and you are sure the wireing is the the right size an type you may need to have an electrican check main panel

I used to have an ammeter but don't now but, may have to get another. Also, The main line connects outside at the meter base then runs straight to the furnace breakers. There is a two pole 30 amp which runs blower motor and outside Ac unit and a two pole 60 amp for the heating circuits. What seems strange to me is, one wire from the 30 amp also feeds one side of the three elements but, that's what the schematic on the back of panel shows. The main wire going to breakers is an SE type cable. It's so low to the floor where the wiring is it is a job laying down on the floor just to try and see any thing. I'm guessing the SE wire to be #6 CU. I've noticed, that both breakers when running get very hot to the touch along with wiring going to the Sequencer, elements,safety stats etc. What type of internal wire should I get to totally rewire the internal wiring omitting the 24 volt circuit and also, should I use something other than the aluminum crimp on spade connectors? These are the original furnace breakers and wondered about them but the last time I checked for voltage drop across them while the unit was running there was none. The breaker at the meter base is only 100 amp. I sure appreciate the help as this really has me concerned since the wife's bedroom is past the furnace and in case of a fire, there's no way she could get out of the old crank out type windows. Thanks Again! :) PS the three element ratings are either 4 or 5 KW

HVACDave 03-04-2011 04:07 PM

Most of the furnace manufacturers are using stranded copper wiring rated for 105 Degrees Celcius, which is about 225 degrees F. You should check with a local heating company and see if they can supply you the proper wiring. You may also find similar at an appliance repair shop for stoves etc. The connectors are ussually a little better in grade than the home depot brand, but if the connections are tight you shouldn't have a heat problem.

The sequencers do go from time to time, a typical life span would be 5 yrs. make sure only one element goes through each branch of the sequencer as each set of contacts is only rated for about 6000 watts (6kw). The brass colored connectors at the bottom of the sequencer are for your 24 volt.

p5200 03-04-2011 04:42 PM

Quote:

Originally Posted by HVACDave (Post 602375)
Most of the furnace manufacturers are using stranded copper wiring rated for 105 Degrees Celcius, which is about 225 degrees F. You should check with a local heating company and see if they can supply you the proper wiring. You may also find similar at an appliance repair shop for stoves etc. The connectors are ussually a little better in grade than the home depot brand, but if the connections are tight you shouldn't have a heat problem.

The sequencers do go from time to time, a typical life span would be 5 yrs. make sure only one element goes through each branch of the sequencer as each set of contacts is only rated for about 6000 watts (6kw). The brass colored connectors at the bottom of the sequencer are for your 24 volt.

Hi Dave, I'll check on some new wire and also, check the schematic again on the back panel for proper wire placement. :thumbsup:


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