Its compact footprint makes it an ideal multi-voltage HVAC transformer for tight low-voltage control sections

or 480V loads

high-output lead to maintain consistent millivolt signals to the gas control valve

making it suitable for most standard oven and duct heater proving circuits

Lennox 17W56 Transformer Els PW 17895 Its compact footprint makes itThe 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.