How do you recharge a dehumidifier's compressor?

the short answer is yes , but id caution you on the need too first?

first check the basics:
bucket full lite not on (blinking)
filters clean ?
both fan and compressor inside running (sometimes the fan runs but the compressor does not?) listen carefull for them both?
if your unit needs recharged odds are it's not financial feasible to do so , first you have to fix cause of gas leaking out ? what ever that is ? then you need to add service ports and finally you need a gas charge , this would or could cost hundreds of dollars , a entire new unit is less 200 bucks unless you do all this work your self , but id tend to think if you had all the tools and knowledge to do that youd not of asked here in the first place

the unit does not require 'recharging' unless you've had a refrigerant leak - in which case you will need a qualified AC TECH to recharge it for you, after, he/she has found and repaired the leak.
But, as I said above, without a leak in the system you do not need to recharge it.

Sounds like the compressor is inoperative. Most, if not all new units have no means of recharging the freon if it leaks out. If the coils are not cooling, the compressor is not operating and the unit will not dehumidify.

Hi,
Here is a tip that I wrote about how to add refrigerant to a air conditioner orcooling system

How to add Freon to a Air Conditioner or Refrigeration System

heatman101

Bob, the unit may not need to be recharged. I may simply be a matter of the humidity extraction level on the unit is set to high. Try lowering the extraction level to 35% or if your dehumidifier doesn't have a LED screen, set to maximum. In addition, be sure that the unit has at least a minimum of 12" clear air space all around the unit.

As far as recharging is concerned, it's like recharging the air conditioner on your car. But, in this case, your mechanic can't or won't recharge the dehumidifier. So before any recharging is done, I would like you to do this in home test.

Move the dehumidifier to the bathroom. Turn the shower on hot enough to generate steam. Do non turn on the bathroom's exhaust fan and close any open window(s) in the bathroom, Turn the dehumidifier ON and set the extraction level at 35%. As you exit the bathroom, close the door. Wait at least 15 to 20 minutes before returning to the bathroom. Ten turn the shower OFF and allow the unit to run an additional 5 minutes. Then check the water collection bucket for water. If you find any, the unit is working as it should. In which case, the humidity extraction level was originally set to high. If there are no signs of water, then the unit needs to be recharged with refrigerant. At that time, if there is a leak, it will be detected. As far as the cost of servicing and recharging is concerned, depending on where you live, it could be up to $100.00 or less.

Hope this helped you troubleshoot and solve the problem. Please let me know. Thanks.

Yes, they can. But, rarely do they need it. In any event, It must be done my a professional.
What makes you think the compressor needs to recharged?

If the compressor motor is overheating, it's usually a result of low refrigerant gas in the cooling coils. Recharging is an option, if you can find a shop that will do it.

Agent gave solution----Compressor needs recharging.

Sounds like it needs to be recharged.

if the compressor is running and the fan is running then the unit has a sealed system leak that will need to be repaired and recharged to function properly