Heating and Air Conditioning - No cooling on new unit when weather is over 102 degrees outside - 3rd time with same problem. Call tech support. Check high pressure switch, check pressures, check board, test voltage across pressure switch. Find unit needs 2 state thermostat. Install new 2 stage cooling thermostat. Use common wire for second stage cooling. Test unit after rewiring. Unit moving more air on new control system thermostat. Unit is operating properly and safely in accordance with Manufacturer specifications.