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Heat tune up on Carrier gas furnace. 77F delta at plenum. Tenant (Mr. King) replaces 16x16x1; filters last replaced 10/2020. Cleaned flame sensor. Gas pressure 3.5†WC. Hot surface ignitor reading 80 ohms. Blower capacitor 7.5 MFD; fine. Unit amp draw 3.65 amps; under manufacturer maximum of 5.2. Verified operation of thermostat and cycling of furnace. Tested DiversiTech condensate pump operation; good. Combustion test proved that furnace is operating at 84.4% efficiency with ideal O2 and Co2 levels. System is operating well at the time of this maintenance/tune up.