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Technicians typically observe "clicks" without ignition
(water column) adjustment range
significantly shortening its service life
High-Durability Construction: Heavy-duty bakelite ensures HVAC control component stability against temperature fluctuations and mechanical wear
Rapid Diagnostics: Simplifies troubleshooting for "pressure switch stuck open" or "stuck closed" faults during mid-season service calls
Lennox 17W56 Transformer Els PW 17895 Technicians typically observe "clicks" withoutThe Lennox 17W56 transformer, also identified as model LB 111888A, is a heavy duty Class 2 transformer engineered for precision voltage step down in residential and commercial HVAC systems. This 40VA control transformer features a primary input of 120V AC at 60Hz and a stabilized 24V AC secondary output, making it the standard HVAC 24V power supply for critical components such as furnace control boards, 24 volt contactors, and digital thermostats.