To query or edit a piece of mechanical equipment on the drawing, go to
Ribbon: DM HVAC->MEQ-> 
Query Equipment
Pulldown Menu: DM HVAC->Mechanical Equipment->Query Equipment
You will be prompted to select the mechanical equipment to be queried.
Select mechanical equipment to query:
The Query MEQ dialog box will appear.
Query MEQ Dialog Box
Changes can be made to the mechanical equipment in the same way as when it was inserted. See the Insert Equipment section for more information.