Wiring Oven

[TemperanceCoaters]

Ok, looked around a little bit and found this link
http://www.emeraldelectronic.com/sto...ID/46/file.htm

Those elements are 3100W, how many would i need to efficently heat up my oven? Also, should i order that contactor or look into two of them? But i think we only have one 220 plug in the shop.

Ive gotten more info on this site then searching for the past year, lol.

[cdaeme]

Ok here are your choices. The elements in the link are 3100 watts so:

3100w X 3 elements = 9300w/240v= 38.75amps
3100w X 4 elements = 12400w/240v= 51.6amps

Using 2400w elements
2400w X 3 elements = 7200w/240= 30amps
2400w X 4 elements = 9600w/240= 40amps

From the above senairos you have two good choices

3100w X 4 elements = 12400w/240v= 51.6amps
Use two of the 40amp contactors as discussed earlier and order 4 matching elements.

2400w X 3 elements = 7200w/240= 30amps
Use one of the 40amp contactors and get 3 matching elements.

You should also be looking at a vent hole and a fan for even heat circulation.

If you decide to go with the two contactor design let me know and I will take some time later tonight to modify the schematic for the additional contactor (you will use the same 220v service). This will probably be the design I use when I build my oven. The switches and temp controler/ thermostat could be used from a donor oven.

This is a great site for info. Thanks to Caswell for providing it for us.

Jason
www.autocyclepc.com

[TemperanceCoaters]

Ok, well im gonna have to figure out how big of a breaker we have in the shop right now, im not quite sure.
If i get 4 of those elements at 3100 will i need a 60 amp breaker? Just to have a little extra?
Or will 3 elements at 3100 heat the oven up quick enough?
Also, will we need two lines of 220 ran to run two contactors? Becuase i dont think the shop can handle that much power draw.

Im thinking that it might work out better for us to run 3 elements at 2400, use the one 40 amp contactor shown.

Also what is the difference in 1 pole, 2 pole, 3 pole, 4 pole contactors?

[TemperanceCoaters]

Ok, the workshop has a 50 amp breaker, i think thats as big as it can go. So im thinking we should run 4 2400 watt elements, these http://www.emeraldelectronic.com/sto...ID/46/file.htm
So, according to your math that will be 40 amps, so would i be able to use one 40 amp contactor?
So onto the contactor, the one posted here is a 40 Amps, 2 Poles, 120 Coil Voltage, but there is one Contactor, 40 Amps, 2 Poles, 208/240 Coil Voltage. Wouldnt i need the 208/240 one?

Onto the vent and the fan. How do you guys hook up fans inside the oven? And what kind of vent do i need that wont let a lot of the heat out?

[cdaeme]

Ok with all the new info you have given I am going to make a recomendation. If this was my situation and oven I would buy three of these http://www.emeraldelectronic.com/sto...ID/46/file.htm and this contactor http://www.famousparts.com/c25bnf240aco.html. The 50amp breaker tells us more about what we need to know with the 10% buffer needed this means the max you need to use on this circuit is 45amps. The three 2700w elements will be a draw of 33.5amps which will work with the 40amp contactor. The max draw for the 40amp contactor with the 10% factor will be 36amps which will still allow room for the draw of the fan motor.

Do you have the switch and thermostat?

You only need the 240v contactor with the 110v coil we will only be applying 110v to the coil to engauge it so the 240v can flow through to to the elements.

If you used the two contactor design you would only need the single 220v source you currently have the contactors would be wired to the internal workings of the oven circuit.

You will only need the two pole contactor because we are only running L1 & L2 through it.

Now the fan. Check out these links this is similar to what you need - http://forum.caswellplating.com/phot...0&ppuser=11900
http://forum.caswellplating.com/phot...0&ppuser=11900
http://forum.caswellplating.com/phot...0&ppuser=11900

A normal household oven has a 2-3 inch vent hole that vents up through one of the top eyes something like that should be sufficient.

Wew!! I think that answered them all.

Jason
www.autocyclepc.com

[TemperanceCoaters]

Wow, your awesome.

Im going to order those 3 elements tonight along with that contactor. I dont know if i have the switch or not, but we do have a thermostat from our smaller oven we can tear out. Where can i get the switch from? The oven maybe?

Onto the fan, where can i pick the blade/shaft/motor up at?

And the vent, just drill a hole your saying?

And another question, what kind of wiring and connections should i use to hook everything up?

[cdaeme]

Sorry, it took a couple of days to get back to ya! I had to celebrate a little over the weekend because I landed my first solid customer. The are a fab shop here in town that specialize in chasis and high end turbos, blowers and exaust systems. They were vey pleased with the first two parts I done for them and have committed all their biz to me including ceramic coatings. Things are looking up!!

Now for your questions:

You will be able to use a switch from a house oven but you need to consider what to use for a panel to mount it inside of.

for the fan & motor
http://www.mcmaster.com/ pg988 Shafts
http://www.mcmaster.com/ pg601 Small-Diameter Light Duty Fan Blades
http://www.mcmaster.com/ pg973 Pulleys

For the motor I would probably rob one from an old washer or something then get it to the needed speed with the pulleys. Use the pages above for reference only and you can also check out grainger.com for the same products.

For the vent maybe a 2-3" hole on the top with a flat steel damper that can be adjusted over the hole to control air flow.

Wiring you will need 6/3 gauge wire with ground from the breaker/ plug to the oven. The internal wiring will need to be a minimum of 10ga.


Jason
www.autocyclepc.com

[TemperanceCoaters]

Excellent. I ordered all the elements and the contactor the other day. Im gonna look into the fans and what not next week, running a little low on cash funds. And about the motor, is it just the motor to turn the washer?
Thanks for all the help and congratulations and your contract.

[cdaeme]

Yep just the motor to turn the washer. I know the tight on cash feeling. Keep us updated on your progress.

Jason

[gourdhedd]

Termperance:
Looks like you 've got most of the questions answered on your oven. Just a suggestion on the fan. Jenn-Aire and other downdraft cooktops often have excellent fans in them. If you can find an old cooktop, the fan will always be good. It flows a lot of volume, so you may have to choke it down a bit, but the fan should hold up to the heat pretty well since it's meant to suck hot fumes off the top of the stove. Kitchen remodelors would be good source for these old cooktops going to the dump. You should be able to find one for free.

Another suggestion: Be sure to place all wiring outside of the oven shell. Wiring inside the shell can have the insulation melt and result in a short circuit. I know of one case in which this happened.

Gary Brady