How to Install & Wire the Fan & Limit Controls on Furnaces Wiring the Furnace Combination Fan & Limit Control using the Honeywell L4064B as an Example This control can be wired to serve as a safety LIMIT switch on a furnace by wiring just the limit terminals on the control. R8184G4009/U - Honeywell Wiring-Wire and mount 130 F (54 C) maximum ambient temperature oil primary control. Wiring-Internal schematic and hookup for R8184 Oil Burner Control. Wiring-Oil & Hydronic Training. Wiring-Oil & Hydronic Training. Honeywell International Inc.