We're putting a sub-floor into a basement room, and the wall-mounted registers need to be moved up about 3". I'm assuming that this is pretty much a standard plumbing task; just drain the system, cut the pipe, solder in a couple of little jogs to move it up, and re-fill the system. However, I'm not all that familiar with HVAC stuff.
Questions:
- Is draining the system a big deal? Any caveats?
- While I've got the system drained, is there any maintenance stuff I should be doing?
- Is there any problem from a circulation standpoint with having a couple of 90 degree bends in the middle of the system?
- If I screw it up, what are the consequences of running a furnace with no water in the system? I'm assuming the furnace is smart enough to not self destruct if there's no water in there.
Thanks!
-Tim