White Rodgers Furnace Control Board Kit 50M56U-843. 50M56U-843 Kit Replaces: Virtually All White-Rodgers and Competitive Single Stage Carbide and Nitride HSI Systems. Replaces All OEM Models 80 Volts or 120 Volts Ignitor Applications. Replaces More Models Than Honeywell S9200U1000.

• White Rodgers 50a50 298

FEATURES 3 Fan Speeds cool, low heat & high heat speeds. Universal nitride ignitor kit 21D64-2. 9 quick-select/quick-connect wiring harnesses. Red LED diagnostic flash codes with stored fault recall.

Low voltage fuse protection, 3A replaceable automotive type. Color-Coded (Labeled) Thermostat Connection For Quick Helpful Selection System Diagnostics, with Fault Recall (Stored) Cover Label Displays Diagnostic Table Humidifier & Electronic Air Cleaner Connections (Optional) Replaces: More OEM Boards Than Competitive Models Because 50M56U-843 Can Be Used on Both 80V and 120V Ignitor Applications Carrier HK42FZ004, HK42FZ007, HK42FZ008, HK42FZ009, HK42FZ011 and HK42FZ016.

That sure sounds like the safe way for it to work. And it seems to agree with what I observed: the igniter was not glowing, and I couldn't smell any gas at all. I do wonder something though. IF the gas were to turn on (but not ignite), would the smell be detectable? Or is the vent motor so effective that all the unburnt gas would be vented and you wouldn't smell it. Just wondering if anyone has any experience with such a situation. That sure sounds like the safe way for it to work.

And it seems to agree with what I observed: the igniter was not glowing, and I couldn't smell any gas at all. I do wonder something though. IF the gas were to turn on (but not ignite), would the smell be detectable? Or is the vent motor so effective that all the unburnt gas would be vented and you wouldn't smell it. Just wondering if anyone has any experience with such a situation. Click to expand.It isn't necessarily the correct info.

White Rodgers 50a50 298

The replacement for your obsolete control uses timed sequences only. As a supposedly improved version this seems to imply that the original wasn't safer than the replacement, or IOW, the old control likely uses timed sequences as well. The gas valve is opened 17 seconds after the HSI is energized. BTW, the flame is detected via flame rectification, in exactly the same way that units with separate flame probes detect the flame.

The position of the HSI in the flame is thus very important. 1/2 to 5/8 of its surface should be in the flame. Richard Perry. I bunch of questions come to mind, if you would be willing to answer: - assuming the igniter is faulty but the control opens the gas valve anyway, how long does the control allow the gas to flow before it detects 'no flame' and shuts it back off? - does the control recycle through the ignition sequence, and if so, how many times does it do this before giving up? - what happens to all the unburnt gas? Is the vent fan supposed to be designed to have sufficient suction to thoroughly scavenge it and blow it out the vent so none accumulates inside the home?

Is that the basis on which such a design is deemed safe?) - where did you get the '17 seconds' info from - your direct experience with this control, or from some white-rodgers documentation? It isn't necessarily the correct info. The replacement for your obsolete control uses timed sequences only. As a supposedly improved version this seems to imply that the original wasn't safer than the replacement, or IOW, the old control likely uses timed sequences as well.

The gas valve is opened 17 seconds after the HSI is energized. BTW, the flame is detected via flame rectification, in exactly the same way that units with separate flame probes detect the flame.

The position of the HSI in the flame is thus very important. 1/2 to 5/8 of its surface should be in the flame. Richard Perry. I bunch of questions come to mind, if you would be willing to answer: - assuming the igniter is faulty but the control opens the gas valve anyway, how long does the control allow the gas to flow before it detects 'no flame' and shuts it back off?

- does the control recycle through the ignition sequence, and if so, how many times does it do this before giving up? - what happens to all the unburnt gas? Is the vent fan supposed to be designed to have sufficient suction to thoroughly scavenge it and blow it out the vent so none accumulates inside the home? Is that the basis on which such a design is deemed safe?) - where did you get the '17 seconds' info from - your direct experience with this control, or from some white-rodgers documentation?