My Pocono On/Off Switch and Fuse Holder Melted

My Pocono On/Off Switch and Fuse Holder Melted

PostBy: Cold_Mainer On: Tue Nov 12, 2013 9:26 am

Got up yesterday morning and the house was cold. Found my Pocono not running. Checked the fuse and the whole fuse assembly had melted along with the back of the off/on switch. The ubit blew a couple of fuses at the end of the season last year and blew another one about a week ago. When the first fuses blew last year I checked all my motors to see what they were drawing for amperage. All were drawing at their rated capacity or less. I have ordered new parts and was told that I will be shipped a new and improved fuse holder/fuse assembly. I guess its been happening to others as well. Has anyone heard any details on why this is happening?
Cold_Mainer
 
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Re: My Pocono On/Off Switch and Fuse Holder Melted

PostBy: Flyer5 On: Tue Nov 12, 2013 9:54 am

Cold_Mainer wrote:Got up yesterday morning and the house was cold. Found my Pocono not running. Checked the fuse and the whole fuse assembly had melted along with the back of the off/on switch. The ubit blew a couple of fuses at the end of the season last year and blew another one about a week ago. When the first fuses blew last year I checked all my motors to see what they were drawing for amperage. All were drawing at their rated capacity or less. I have ordered new parts and was told that I will be shipped a new and improved fuse holder/fuse assembly. I guess its been happening to others as well. Has anyone heard any details on why this is happening?



The new and improved fuse holder is just a longer standard fuse that can be purchased anywhere instead of the short form factor fuse that no one has and had to be special ordered. All ratings are the same and it was not replaced because of trouble. The switch has been upgraded to a better version mostly because of the Hyfires and furnaces but it was done to all units. You do need to check the start up current on your blowers and motor. Its one thing to check current when a motor is already running but the start up may show something completely different. If you were continuously blowing fuses you have something going on and possibly failing. The general rule is a fuse blows for a reason they do not wear out there is an over current situation somewhere. If one fails it is recommended to replace it for troubleshooting only. The problem needs to be found.
Flyer5
 
Stoker Coal Boiler: Leisure Line WL110
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Re: My Pocono On/Off Switch and Fuse Holder Melted

PostBy: McGiever On: Tue Nov 12, 2013 10:14 am

NEVER REPLACE A BLOWN FUSE WITH A HIGHER AMP RATING/SIZE

EQUIPMENT AND POSSIBLE PROPERTY DAMAGE FROM FIRE MAY OCCUR
McGiever
 
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Re: My Pocono On/Off Switch and Fuse Holder Melted

PostBy: freetown fred On: Tue Nov 12, 2013 4:08 pm

Oh CRAP, is that in general? I guess penny's in the old fuse box is out of the question :blowup: ;)
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Re: My Pocono On/Off Switch and Fuse Holder Melted

PostBy: anthony7812 On: Tue Nov 12, 2013 4:26 pm

Rule of thumb fuses are short circuit protection overloads are usually over current protection. Fuses pop for a reason period. I would do some testing before installing anymore fuses, it must be something good to cook the holder.
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Re: My Pocono On/Off Switch and Fuse Holder Melted

PostBy: Matthaus On: Wed Nov 13, 2013 9:15 pm

The design of a panel mount fuse holder incorporates a tight fit in the twist on cap. Over time this gets loose and adds resistance to the circuit (and therefore higher current draw). When you add the normal loads in the circuit it can exceed the rating of the fuse. Always check the fit of the fuse in the cap if not snug you will need to carefully squeeze the cap so the fuse fits tight. The Hyfire and Pocono are more apt to have this problem due to multiple fans (and feeders in the case of the Hyfire).
Matthaus
 
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Re: My Pocono On/Off Switch and Fuse Holder Melted

PostBy: nwaelder On: Thu Nov 14, 2013 11:45 am

Has anyone heard any details on why this is happening?


This is happening because the pressure contact between the fuse and fuse holder can oxidize or become less than firm. This will cause the resistance (as Matt said), to increase. This resistance increase in turn causes local heating of the fuse/fuse holder assembly, which further causes more oxidation and resistance etc.

We changed to the 1 1/4" fuse style a few years ago, otherwise it is the same with the idea that the 1 1/4" fuse has more contact area (better contact) than the 20mm size fuse. In either case, the component is and was properly rated and applied. Turns out that besides being easier to obtain, the 1 1/4" likely runs cooler and we all like that.
nwaelder
 

Re: My Pocono On/Off Switch and Fuse Holder Melted

PostBy: xackley On: Thu Nov 14, 2013 12:54 pm

When the fuse holder on my Pocono cooked itself, I replace it with an automotive blade type fuse/holder, 10 amp. Could this create a future problem?
Thank you
Don
xackley
 
Stove/Furnace Make: Leisure Line
Stove/Furnace Model: Pocono

Re: My Pocono On/Off Switch and Fuse Holder Melted

PostBy: nwaelder On: Fri Nov 15, 2013 12:10 pm

xackley wrote:When the fuse holder on my Pocono cooked itself, I replace it with an automotive blade type fuse/holder, 10 amp. Could this create a future problem?
Thank you
Don


Only problems I see: The automotive 12VDC fuse is not designed to interrupt 120VAC, the I^2t curve of a 10A automotive fuse won't have even a chance to protect the circuits as designed, and the likely fact that a 'rig' to adapt an automotive blade type fuse probably involves duct/electrical tape and therefore likely exposed 120V wiring and/or possible internal exposed wiring. Other than this, you should be fine... Sorry for the harsh reply, but you asked. Oh, and it probably looks like hell.
nwaelder
 

Re: My Pocono On/Off Switch and Fuse Holder Melted

PostBy: anthony7812 On: Fri Nov 15, 2013 1:30 pm

Without actually testing all your equipment, the fuse holder being loose is a good guess not a definite cause until all else is ruled out. I would make sure you check the equipment before coming to this solution. Just my .02$ ;)
anthony7812
 
Stoker Coal Boiler: VanWert VA 400
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Re: My Pocono On/Off Switch and Fuse Holder Melted

PostBy: xackley On: Mon Nov 18, 2013 11:53 am

Double post
Last edited by xackley on Mon Nov 18, 2013 11:54 am, edited 1 time in total.
xackley
 
Stove/Furnace Make: Leisure Line
Stove/Furnace Model: Pocono

Re: My Pocono On/Off Switch and Fuse Holder Melted

PostBy: xackley On: Mon Nov 18, 2013 11:54 am

nwaelder wrote:
xackley wrote:When the fuse holder on my Pocono cooked itself, I replace it with an automotive blade type fuse/holder, 10 amp. Could this create a future problem?
Thank you
Don


Only problems I see: The automotive 12VDC fuse is not designed to interrupt 120VAC, the I^2t curve of a 10A automotive fuse won't have even a chance to protect the circuits as designed, and the likely fact that a 'rig' to adapt an automotive blade type fuse probably involves duct/electrical tape and therefore likely exposed 120V wiring and/or possible internal exposed wiring. Other than this, you should be fine... Sorry for the harsh reply, but you asked. Oh, and it probably looks like hell.


Actually, no duct tape, and it looks very good with the proper soldered fitting that slide into the sockets of the wires of the original fragile fuse holder.
When it is getting cold at 8:30 pm and the only option is to hot wire, or buy the part that might be good enough, I went with the safer gamble.

Let me know what to buy that will actually protect the circuits.

Thank you
Don
xackley
 
Stove/Furnace Make: Leisure Line
Stove/Furnace Model: Pocono

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