Performed an A/C pm on (2) systems. Blew out the drain line, replaced the air filters, customer supplied. Rinsed the condensers. Checked the electrical connections, checked the pressures and temps. The 2nd fl system was low on charge, added 12 oz R22. Also the capacitor was at the 10% tolerance before not working correctly. Replaced the capacitor and tested operation. The first floor system- after turning the thermostat on, there was a delay before the air handler started, possibly due to the batteries. Customer replaced them and the air handler started and contactor pulled in correctly. When the condenser started, the fan motor was spinning backwards due to the fan side of the dual capacitor being weak. Replaced the capacitor, started and finished testing the system. System is operating properly.