Enhanced Conductivity: Heavy-duty lug and spade terminals ensure secure electrical paths and reduced heat generation

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Rapid Diagnostics: Simplifies troubleshooting of furnace limit switch errors and venting issues in high-efficiency units

the 4J sleeve coupling flange minimizes bearing stress and prevents premature drive failure

York S1-3120A3571 Sequencer Enhanced Conductivity: Heavy-duty lug andThe York S1 3120A3571 Sequencer is a critical multi stage control component designed for 20 23 KW electric furnaces and high output residential HVAC systems. As a genuine OEM York replacement part, this assembly utilizes a 24V coil to manage the staged activation of up to four heating elements, preventing dangerous current spikes and nuisance breaker trips during initial startup. This electric furnace sequencer relay features four sets of normally