Ok some updates, and kind of fyi for anyone else moving with a dampp chaser.
We moved last week, so this is all now from direct experience. The tuner was scheduled to be in town for other clients so he came over two days before we moved and I got down on the floor under the piano with him (that was kind of awkward) and he showed me the location of the tank, the hooks, the water sensor etc.
First re some questions above, yes, the tank has to be completely removed in order to empty it.
Second, even if it's empty, the tank should be removed before moving a grand piano. The tank hangs on four skinny hooks. They look like they could easily be broken. Also, because the tank hangs down, I think it would be in the way when the piano gets put onto its side, and it would be in the way when the piano gets strapped into the board on the moving trunk.
Fortunately, this is pretty straight forward. Lying under the piano, you can easily remove the tank by lifting up and getting those hooks off of the bars or whatever they're hanging on. Take a photo first so that it's easy to put it back into place.
The other thing you need to do is push the water sensors up out of the way. These are two long, thin ...poles (for lack of a better word) that hang down into the tank and tell the system when the tank is out of water. The tuner showed me how to push them up out of the way so that they don't get broken or damaged during moving.
The heater bars are not really in the way. Oh but you do have to remove the pads which drape over the heater bars and sit in the water. Remove those, and put them back when re-installing the tank.
We also had to remove the zip ties that held the power cord onto the lyre brace. The movers said that the lyre braces actually need to be removed for transit to ensure they don't get snapped off! (Which would be bad...)
Let's see, what else did I learn....
I think that's it. After the piano was moved and set up, Mr. SK draped the pads over the heater bars, lowered the water sensors, and reinstalled the tank for me. As soon as I plugged it in, the lights lit up telling me it wanted water, so we're back in business! 🙂
In conclusion: if your grand piano is being moved, be sure to remove the DC water tank and prep it for moving. 🙂