I just bought a Makita MAC700 as a first air compressor. I don't know
yet about the unit, but the instructions are very, very poor. No
picture of the unit anywhere or descriptions of the various parts.

There is apparently a plug that comes in the unit that closes off the
air intake, and a separate air filter that must be attached. The
instructions say nothing about this. I ran the unit for 20 minutes to
fill up the 2.6 gallon tank. Later, when looking at the box picture,
I realized where the air filter attached and discovered the plug.

1) Could I have possibly damaged anything by running the unit with
almost no air intake for 30 minutes?

2) I anticipated leaving the unit with air in the tank all the time,
but the instuctions hint that the air should be drained after every
use. What's common practice here?


Thank you.