help wiring for KitchenAid wall oven

[grizzly]

I purchased a KitchenAid wall oven KEBK171SBL to replace a 19 year old GE wall oven.

The old wall oven plugged into a 240 volt receptacle whereas the new oven has no plug and needs to be hard wired. I removed the receptacle leaving only the house wiring in the cabinet which is a 10-2 G (one bare, one white, one black, NO red). (see attached pic of the scene under my oven)

The wires of the wall oven are black, white, red, and bare.

Question: how do I hook up the four wires from the appliance to the three wires in the house's cable?

I guess I'm confused by the fact that the old 240 v wall oven worked when the circuit it was on has no L2.

Here's the link to the model, there is a link to a PDF of the installation guide at the bottom of the page:

http://www.kitchenaid.com/catalog/product.jsp?src=Built-in+Ovens&cat=124∏=1325

[RegUS_PatOff]

are you sure there is no L2 ?

check the voltages.

they could (shouldn't) have used L1, L2, and used the ground for neutral.

 

 

[grizzly]

You are correct, the black and white are both hot.

I wired black to black, red (from appliance) to white (from house), and both grounds and white neutral from appliance together, and it heated up my pizza no problem. I guess this is how three wire appliances used to be wired, neatral and ground were together.

Now my only problem is that the manual says to use a 40 amp breaker, but the existing circuit is has 30 amp breaker with 10 G wire. I think I'll have to use bigger wire if I put in a 40 amp breaker?

I might not bother with it, my clamp on ammeter showed a max of 23.6 amps when both of the elements were energized, 15.4 amps when only one of the elements was heating, 8 amps when the cooling fan motor is running, and less than one amp when the oven is turned off (ie: only the LCD clock display is on). Note: this is not a convection oven, but it does have a cooling fan motor.

[RegUS_PatOff]

I'd suggest replacing the breaker and the wire to code as soon as possible for shock,  safety, ect..

You wouldn't want a fire, and determined to be caused by underated wiring.