The most important thing to do is to make sure that the condensing unit is properly placed and also that the pressure switch that has the seal is on the correct position. If the seal is not in the right place then you will not be able to have a good flow of air when the appliance needs it. This is because the seal will allow the moisture to leak from the system when there is not enough condensation that needs to get out of the system.
Another thing that is important to do when you have the condensing unit in the correct position is to make sure that you place it near the lowest point where you can vent it. For example if you have a condensing unit that is located near your basement and it has a seal then you will need to make sure that you put it right by your basement. If you have a condensing unit that is located right above your basement then you should put it somewhere in the corner of your room because this is where you will get the best flow of air coming from the condensing unit.
The other thing to do is to make sure that you place the condensing unit in an area where you do not have any drafts or hot spots. The best place is where there is not a lot of traffic, like a kitchen or a bedroom. The best place is always under your bed. If you are using your condensing unit, make sure that you place it near the edge of the bed so that there is not a draft coming out of the condenser.