TRANFER QUICK-CONNECT WIRING POINTS: As shown in Fig. Define control board. Carrier Bryant Furnace Control Board Upgrade Kit 325878-751. Control board installation procedures are described in detail in these instructions. $175.12. I know it is mounted on 4 plastic stands, but sometimes the board can come in contact with the metal mounting plate. Also on the old board there is a XFMR-H (black) connection AND a XFMR-N (white). I also had to purchase a "flame ignitor sensor upgrade kit", because of the date of the furnace. $50.11. Contemporary furnaces have most of their operations linked into a furnace control board, which is the core of how the furnace works. With the exception of the mounting points, this board seems to be an exact replica of the Honeywell ST9120C4057 control board that was in my furnace. Failure to do so may result in control board damage. Heatcraft Defrost Timer 21340101. The new board only has 1 and it just states XFMR. : The total connected load depends on the electrical devices that are actually connected to the circuits and how often these items are being used. Disconnect and remove the piggyback $179.12. Carrier Bryant Control Board HK38EA004. It might ground out the control board and cause it to get hot, start smoking, or the board catch on fire, but unit itself wouldn't catch on fire. Identify YOUR Circuit Board. This added to the confusion when the instructions and drawing had sockets that didn't match ours :blink: and we couldn't get the burners to come on. Good. The replacement board was a "Universal" So it was not the same as the original. Carrier HK42FZ027 Furnace Control Circuit Board HK42FZ027. If you know of something we missed please email us. Important note: $178.95. what does that really mean? Some are called Fan Timers, others Control Boards, Defrost Controls, Defrost Timers, Circuit Boards, Logic Boards and probably as many other names again, depending on the equipment or board manufacturers terminology! HVAC Definitions Terms & Acronyms | Heating Cooling - This is a comprehensive list of HVAC Definitions Terms & Acronyms. $248.12. 1, transfer the following quick-connect wiring points from the old board to the new board: “XFMR-R”, “XFMR-C”, “C”. How do I figure total amps in the panel box? There are scores of different Furnace, Air Handler and Heat Pump Boards. Pages 3 through 5 are procedures for programming the control board and the diagnostic codes for the control board. 5. with a *G7 control board (PN 624690), install all wires from the door switch and 24V transformer on the same pin locations they were removed from. If it did touch the metal, the whole unit shouldn't catch on fire. The modern furnace is a marvel of technology, especially when compared to the furnaces of yore, which were basically large ovens with pipes hooked up to them. Read and follow these instructions carefully before replacing the control board. the heater kit and reconnect it directly to the new board. I get 5 red flashes on my control board indicating open role out? Defrost Control Board Trane American Standard CNT04364. I removed the control board and found that the fan relay had burnt out. ProLogic: Main PCB Layout A I Remote DSP comm (RS485 – 10VDC) B Temp sensor terminal block (5VDC) C Heater 1&2 terminal block (dry contacts) D Valves 1-4 & 4Amp fuse ( 24VAC) E Cell Plug for chlorination F High Voltage Relays (top – Filter, Lights, AUX1, AUX2; bottom (AUX 3-6). I got the part number off of the board and typed it into Amazon search. 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