Church HVAC maintenance. 6 - Trane A/C systems cleaned, tested and tuned. Replace air filters and add 1lbs of R-22 refrigerant front A/C unit of church. Note all outdoor units are 3 phase units. Rectory area upstairs unit would run then shut off. Thermostat would blink cool this is a time delay unit came back on then shut down again, I pulled thermostat off the wall and replaced batteries, let unit run, all is good.