{"product_id":"50m51-843-trane-emerson-furnace-control-circuit-board","title":"50M51-843 TRANE Emerson  Furnace Control Circuit Board","description":"\u003cp\u003e\u003cstrong\u003e\u003cem\u003eThis product may contain shelf wear, have minor cosmetic imperfections, or have been tested. All our certified pre-owned products are backed by our return policy. We offer free shipping on all items. Please contact us for discounts or if you have any questions. We look forward to doing business with you!\u003c\/em\u003e\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003e· Integrated two-stage Hot Surface Ignition (HSI) furnace control module, model 50M51-843\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e· Input Voltage: 24 VAC, 60 Hz (requires Class II transformer) · Maximum Input Current: Approx. 530 mA + millivolt (MV) power · Relay Load Ratings: - Gas Valve Relays: 1.5 amps @ 24 VAC - Inducer Output: 120 VAC two-speed - Circulator Output: 120 VAC 3-speed PSC motor control - Humidifier and Electronic Air Cleaner Outputs: 120 VAC · Fuse Protection: 3 amp replaceable automotive-type fuse · Operating Temperature Range: -40°F to 175°F (-40°C to 80°C) · Features tri-color LED diagnostic indicators (Green, Red, Amber) for status and fault codes · Supports flame current monitoring with high sensitivity: minimum flame detection current 1 µA DC · Automatic blower fan ON\/OFF delay settings selectable via dipswitches · Includes single-wire twinning interface for multi-unit coordination · Compatible with universal 80V and 120V HotRod™ ignitors (e.g., 21D64-2) · Historical fault retrieval accessible by pushbutton · Non-volatile memory microprocessor for reliable operation · Terminal connections for pressure switches, thermostat stages (W1, W2), blower (G), cooling (Y), and common (C) · Designed as a direct replacement for White-Rodgers 50M51-242 and similar Emerson integrated furnace control modules\u003c\/p\u003e\u003cp\u003eThis board enables safe, efficient control of furnace ignition and blower operations and is widely compatible with two-stage systems requiring an integrated HSI control. Installation typically involves mounting the board, wiring to furnace components according to the furnace wiring diagram, and configuring optional delay features as needed. It is essential to verify compatibility with your specific furnace model before installation.\u003c\/p\u003e","brand":"Emerson","offers":[{"title":"Default Title","offer_id":43672958042221,"sku":"13163","price":237.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0637\/2419\/1853\/files\/s-l800_490d730f-2ea1-4bc3-8e4a-ac1c9e51afb0.jpg?v=1763344558","url":"https:\/\/willardshvacsupply.com\/products\/50m51-843-trane-emerson-furnace-control-circuit-board","provider":"Willard's HVAC Supply","version":"1.0","type":"link"}