I have a Commercial cool Air conditioner CPRB08XCJ. When it starts it has a grinding noise then it clears up. At the end you hear the noise again. Is their a video step by step to fix it?

Can you please advise if you have followed all the steps in the manual to get it working.

U need that hose to direct the warm air outside the area to be cooled. If you remove it, the hot exhaust will stay in the room being cooled and negate the cold air being directed into the room.

That is why regular room AC units are mounted on window sill. Cold air in, hot air out.

There are generally no fitting to connect to the sealed systems of portable air conditioners. You can buy a 'saddle valve' that will pierce the suction side and allow you to check low side pressure, but they will allow a very slow leak in most cases.
It likely uses R134a instead of Freon.

that port is for a hose drain use, if not using a drain hose the port must be plugged

all a/c units remove moisture from air with cooling coil being cold and room air blowing across coil - depends how humid it is - i have used several different portable units and this seems to be a common problem if it is humid

Look for a little compartment of slot for a fuse or a reset button. Do you have the owners manual? That might give you some solutions as well.

fills up with water every 2 hours empty water back on

This website has got to stop letting just anyone answer questions. All 3 of these answers were completely unrelated and not helpful for this person asking the question. They didn't even look up the model number to understand what type of unit this is. I realize it's a very old question, but I'm sure even today there are people giving ignorant answers just as these 3 did.
***back of unit, very bottom, there's a drain hose connection. It's supposed to have a rubber plug in it and a plastic cap screws on over that. Hose isn't necessary to drain, if draining is needed as this unit evaporates the water through the exhaust. But water will build up under certain circumstances. Periodically check and drain by 1. Sit unit on something to elevate it high enough to put a container underneath to catch water. Make sure to sit unit on something very sturdy or take it outside and let it drain out on the ground, it's just water. 2. Remove cap and rubber plug. Water will drain. 3. Replace cap and plug when water stops draining, that is all.

The compressor is not starting. The buzzing noise you hear is the compressor trying to start and then the thermal overload trips. When it cools it will try to start again. Could be a bad capacitor or the compressor is bad. These two units need to be tested to see which one is bad. A capacitor is inexpensive. If it's the compressor it will be cheaper to buy a new AC.