Performed cooling maintenance on a Lennox AC system Filter is good Provided a 20x25x1 Filter that's included with the gold maintenance plan Drain is clear Blower is clean UV light is functional Tore down and washed outdoor unit Capacitor in spec Wiring is secure and free of damaged insulation Connected air probes to ductwork and refrigeration probes to outdoor unit Compared readings to the unit charging chart Verified indoor coil has a TXV metering device System was running 0.8⁰ subcooling after being cleaned. Per the chart at 85⁰ outdoor, we should have 4⁰ subcooling Got authorization to add R410a refrigerant Topped off system charge to achieve 4⁰ subcool System is operating well within manufacturer's specifications at this time
