There are other posts related to the HEM V1 in the forum. Do a search for these posts.
The post before the last one in this thread stated 3 devices appeared. You should have 3 devices, 2 devices for the each of the energy clamps and one main device for the summation of the clamps.
In addition, in my case, the clamp readings kept freezing. If you look at HEM clamp devices for the frozen device by going to device/advanced/variables, you may notice that the capabilities field is blank. This is an indication that this device is not working. You can force this to start working again by selecting the main HEM device and forcing the "Configure node right now" command. This will recreate the broken device, but it will give the device a new number. Not a great solution if you have scenes or even energy reports tied to this device.
In my case, I modified the report intervals to 240 secs and this seemed to resolve the freezing issue noted above form reoccurring.