Gas and Oil Home Heating Furnaces - New Central AC system charge

I just had a new central AC system installed in my house. I actually required several units since the house uses 4 seperate furnaces (a long story). Anyway, after the line sets were run, evaporator coils were in and condensiing units set, I asked the tech if he was going to evacuate / pump down the systems. I thought this was a normal practice in any air conditioning system and know that this is the case anytime you open an automotive system so you can remove all the air from the system.

He stated "no there is no need to, and that the condensing units are already charged". Basically I understood that they send the condensing units with enough charge to fill the average system, but was surprised that they weren't going to create a vacuum to remove all the air before introducing the freon into the system.

???How did they get the air out of the system and is this correct / incorrect that they didn't vacuum all the air out first before charging it???

The outdoor unit is precharged as the tech said. It does not need a vacuum. The line set and indoor coil are open during installation (unless the line set and coil have special fittings and are precharged also). This portion of the system needs to be evacuated to remove air and water (vapor).

The air left in the system includes water and oxygen that will chemically corrupt the system and the compressor oil. The air also is not condensable and raises the head pressure and temperature. This reduces efficiency and the life of the equipment.

Put your complaint in writing to the company, the manufacturer, and the state registrar of contractors (in most states).