2 combustion air terminal, 3 o2 sensor (o2+ & o2-), 4 spark signal (flw+ & flw-) – AERCO BMK 2000DF User Manual
Page 29: 5 analog in (+ & -), 6 b.m.s. (pwm) in (bms+ & bms-), 7 shield (shld & shld), 8 analog output (+ & -), Sensor (o2+ & o2-)
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