I fired up my new (first fire up) Accentra stove earlier this evening and it ran great for about 2 hours. Then, I left the room and came back and the flame was out. No power light either. Beautiful clear night and no storms. I checked the fuse and it was blown. The stove is hooked up to a UPS (BE750G). Any idea why the fuse would blow? Thanks for the help. B-
Blown Fuse, New Accentra.......
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Warranty time, probably a failed component that happened on the warranty period and not after! Now to see if the dealer steps up to bat? Let us know the outcome. In the mean time, have a beer.
glenc0322
Minister of Fire
Bioburner
Moderator
Hello
Here is my 2 cents with Ohm's Law
V=IR (Voltage = Current or amps times resistance)
Therefore
I=V/R
Harman Ignitors are 306 watts so 306watts/50ohms = 6.12 amps!
In the Harman Accentra Manual on page 29
They say the fuse has a 5 amp rating.
However In the parts list towards the end of the manual they list 6 amp replacement fuses.
Fuse 6 AMP Pkg of 5 3-20-49447-5
Out in the field, I have seen 7 amp fuses installed on some of these panels!
This maybe why.
When the 306 watt ignitor starts the stove and pulls more than 6 amps. Bong!
My guess is the power rating for the fuses may not have been correct in some of the manuals.
Harmans have been around for a long time and the manuals are quite old.
Some stoves have a separate fuse for the ignitor which I think is a really good idea!
Since this is a new stove.
I would check with your Harman dealer to see if there are any service bulletins on updated fuse recommendations.
Here is my 2 cents with Ohm's Law
V=IR (Voltage = Current or amps times resistance)
Therefore
I=V/R
Harman Ignitors are 306 watts so 306watts/50ohms = 6.12 amps!
In the Harman Accentra Manual on page 29
They say the fuse has a 5 amp rating.
However In the parts list towards the end of the manual they list 6 amp replacement fuses.
Fuse 6 AMP Pkg of 5 3-20-49447-5
Out in the field, I have seen 7 amp fuses installed on some of these panels!
This maybe why.
When the 306 watt ignitor starts the stove and pulls more than 6 amps. Bong!
My guess is the power rating for the fuses may not have been correct in some of the manuals.
Harmans have been around for a long time and the manuals are quite old.
Some stoves have a separate fuse for the ignitor which I think is a really good idea!
Since this is a new stove.
I would check with your Harman dealer to see if there are any service bulletins on updated fuse recommendations.
Last edited:
Isnt the formula P=I(^2) x R. Therefore to solve for I, you'd need to take the square root of P/R, which would yield ~2.5 amps. Or alternatively I=P/V, which would be 306/120 = ~ 2.5 amps.
Unless I'm missing something...these are the formulas i've lived with. My Mt. Vernon has a 380 watt ignitor and the manual notes startup @ 5 amps.
Unless I'm missing something...these are the formulas i've lived with. My Mt. Vernon has a 380 watt ignitor and the manual notes startup @ 5 amps.
I am sorry, you are right, It should be "Voltage" V=IR so the calculations are correct. Thanks for keeping me on my toes!
My calculations make the 7 amp fuses I see the field make sense.
Although you used the more complex formula, the result is correct....not sure where Don got his formula from.
Ohm's law (in this case) is I (current) = V (voltage) divided by R (resistance) So, in this case 120v divided by (approx)47 ohms = 2.6 amps.
A 6 amp fuse should be plenty, so there is a problem elsewhere.
new Harman = 2 year warranty = call the dealer.......that's my math. I would throw a tester on the outlet first tho to make sure it isn't a power supply issue (then you'll be paying for a service call!)
That 5 amp fuse is likely to be a 240 volt part .
V =IR
P = VI or IRI or I^2 R
keep on a trucking.
V =IR
P = VI or IRI or I^2 R
keep on a trucking.
Bioburner
Moderator
B=FG (where B is beer), and the result is FG (Feeling Good)....my favorite formula after S=EX
I changed the fuse and it powered up but then blew when i turned the stove on. I put another one in and it blew immediately when i plugged the stove in. Calling the dealer today. There must be a short somewhere I'm guessing. Good thing its only September.
Combustion motor kicks on for 2 seconds when the unit is powered. I'd disconnect that and go to test and see if any of the other motors knock the fuse out. If not, there's your problem. Originally the stove blew the fuse while running and not at start up so it most likely is not the igniter.
![[Hearth.com] Blown Fuse, New Accentra.......](https://www.hearth.com/talk/data/attachments/112/112305-38335fae8ee2a1a8ff8286463038f563.jpg?hash=eF1toMVkO6 "[Hearth.com] Blown Fuse, New Accentra.......")
http://www.etgiftstore.com/items/ALL-PRODUCTS/Ohms-Law-Watches~Clocks~Stickers~MORE/list.htm
This clock is on my Christmas wishing list. For direct current, it combines both Ohm's law and Joule's law in very clear way:
![[Hearth.com] Blown Fuse, New Accentra.......](https://www.hearth.com/talk/data/attachments/112/112306-e39b97d152fd55f5c8ff95e5ac9bfcc1.jpg?hash=vztJiuFdUw "[Hearth.com] Blown Fuse, New Accentra.......")
Or what about this 2" medallion coin with the AC Laws on one side and the DC Laws on the other:
![[Hearth.com] Blown Fuse, New Accentra.......](https://www.hearth.com/talk/data/attachments/112/112307-4790a3f229550ad70c91ac519589b05d.jpg?hash=1xk-PE4VCF "[Hearth.com] Blown Fuse, New Accentra.......")
EastMtn
Burning Hunk
- May 19, 2013
- 205
Why didn't I see this thread earlier. Now you're talking in my language
V=IZ
(broken image removed)
Where:
Z=Impedance (ohm)
R=Resistance (ohm)
XL=Inductance Reactance(ohm)
V=IR works well in a DC circuit but there's an extra component of inductive reactance in an AC circuit. The result is inconsequentially minuscule but nevertheless exists.
I realize I'm a season late and a pellet short and apologize.
I'm actually very interested to see what caused the fuses to blow. Any word yet?
V=IZ
(broken image removed)
Where:
Z=Impedance (ohm)
R=Resistance (ohm)
XL=Inductance Reactance(ohm)
V=IR works well in a DC circuit but there's an extra component of inductive reactance in an AC circuit. The result is inconsequentially minuscule but nevertheless exists.
I realize I'm a season late and a pellet short and apologize.
I'm actually very interested to see what caused the fuses to blow. Any word yet?
Bioburner
Moderator
Update,discussion I think went to "Is it unreasonable to ask for a new stove?" Tech to arrive Wednesday.
But we don't have a double squiggle (~) line on most keyboards to indicate for nearly all needs is equivalent too.
One needs to keep the square roots of negative quantities out of most forum posts as people have a hard enough time with real numbers let alone imaginary and complex numbers.
Bioburner
Moderator
EastMtn
Burning Hunk
- May 19, 2013
- 205
That's what my therapist said about my complex yet imaginary friend. So I switched therapists realizing that beer is cheaper therapy.
That works for me too and if we stick to electrical analogy: Drinking a couple of beers works like a phase compensation capacitor for me... I can then more easily accept that life is very complex sometimes
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