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The genuine OEM Lennox 15R48 is a Tecumseh AVB5542EXN reciprocating compressor (Lennox ref. 105074-02) rated at 42,000 BTUH on 208-230-volt, single-phase power with R-22 refrigerant. This piston-driven compressor pressurizes and circulates refrigerant through your Lennox outdoor unit to drive the cooling cycle. Reciprocating compressors are rugged and well-suited to the operating conditions of legacy R-22 Lennox systems, making the 15R48 the correct drop-in replacement for that equipment.
Common failure symptoms: no cooling or weak cooling, the unit humming without starting, breaker or overload trips, loud knocking from worn valves or bearings, hard-starting, excessive amp draw, and grounded or open windings. Valve plate failure and stuck pistons are common on aging reciprocating units.
Why OEM matters: the 15R48 matches Lennox's exact capacity, voltage, and refrigerant specifications for R-22 service. Using the OEM Tecumseh compressor keeps the system properly matched, protects warranty coverage, and avoids capacity or electrical mismatches from generic substitutes. Because R-22 is phased out, verify recovered refrigerant and system condition, install a new filter drier, evacuate the system, and confirm voltage and start components before energizing.