hi guys i am new to this bussiness an i never installed new units only serviced.....

i have to relocate this 2 condenser units 2 ton to the roof on the roof of a 2 flat apartment building...

will it be any problem with the oil not coming back to the compressor since the evap is below the condenser somone told me they do some kinda trap like on the sinks..

thanx a lot for any information...do i have to call a truck to put those condensers up on the roof or there are manual lifters that u put on the roof and pull the condenser up is not that big 2 ton 10 seer