I haven't done the power bleed yet with my Nanocom but I found this when I googled it:
http://www.d2faq.co.uk/#nanocom_power_bleed
"To bleed the brakes using a Nanocom with its software tool called Power Bleed. It saves you having to get in the D2 and pump the brakes for each wheel.
- Remove reservoir cap.
- Check fluid level and top up if required (DOT4).
- Attach length of hose to bleed nipple.
- Make sure other end of hose is submerged in good clean DOT4 (eg in a clean glass jam jar).
- Crack off the bleed nipple.
- Select power bleed in Nanocom.
- Repeat until you see no air bubbles coming down the tube and can see only nice clean fluid.
- Close the bleed nipple.
- Remove hose.
- Repeat for each calliper - being extra careful to keep topping up the reservoir! You might want to discard the fluid that's coming out each time if it's particularly nasty and you have lots of DOT4 to hand.
On Right Hand Drive models you bleed the brakes in this order, Front Left, Front Right, Rear Left, Rear Right."