Inside the box, you will find the actual control, the 120v silicon nitride hot surface igniter, mounting screws, mounting screws, mounting standoffs, spade terminals, and an instruction sheet. You can configure the control without a power source before installation using near-field communication (NFC) technology with your smartphone. The White-Rodgers Connect app allows you to configure the control using the cross-reference part numbers.
Prior to installation, shut off the power and confirm that there is no power going to the unit. Then, you can remove the old board; it is a good idea to take a picture of the board prior to removal so that you can see how everything was plugged in, but the unit’s wiring diagram will also come in handy. Once you have configured the board using the WR Connect app, you may begin installing the control by using the mounting standoffs and screws to mount the IFC in the unit.
Once the IFC is in place, you can begin wiring it in. The box comes with wiring instructions to help you wire the transformer, neutral, and low-voltage wiring. Then, you can add the plugs. The board doesn’t require you to use harnesses; you can simply plug the OEM plugs into the control. If you install the control on a system with a PSC blower, you’ll plug wiring into the top of the control; wires for ECMx blower motors will be plugged into the right side of the control. The control also has one low-voltage plug where all of the low-voltage wires connect, allowing every low-voltage wire to be connected and disconnected from the control all at once via the plug. The board also allows for a two-stage setup on units that require it.
The board has a digital display, allowing it to show error codes easily. The board face contains a list of error codes and run codes, which allows you to understand the status of the board. With the board in place and fully configured, you can install the hot surface igniter.
Once the board and igniter are installed, you may test the unit. When you restore power, the IFC will take a moment to understand the OEM’s logic and adapt to its current application. Then, the furnace will go through its sequence of operations. The digital display shows the operating mode (heating or cooling) and reports the flame sensor microamp reading.
Learn more about the 50M56X-843 at https://hvacrschool.com/wrhsi.
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