Universal Single Stage IFCs - Emerson US

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Universal Single Stage IFCs

Universal Single-Stage IFC’s50M56U-843 for PSC Blowers 50X57-843 for ECMx Blowers

Business and Product Overview50M56U - 843 for PSC Blowers 50X57 - 843 for ECMx Blowers

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50X57-843 50A55-843 50A65-84350M56U-843

• 120v Hot Surface Ignition

• Single Stage Heat• PSC Blower• *Ignitor included


• Single Stage Heat• ECMx (X-13)

Blower


• Single Stage Heat• PSC Blower


• Single Stage Heat• PSC Blower

White-Rodgers Offers Four Universal Single Stage IFCs

38 Cross-references 132 Cross-references 38 Cross-references430+ Cross-references


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50M56U-843 50X57-843

50M56U-843 and 50X57-843

The 50M and 50X offer our widest cross-ref applicability, and best features in a Single Stage IFC replacement.

• Over 460 cross references, combined

• Multiple mounting options• LED fault indicators• Easily-referenced fault guides• Twinning capable


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Market

The US market for single stage applications offers a huge opportunity for replacements.

With Universal Controls like the 50M56U-843 and the 50X57-843, you can cover a wide variety of those OEMs, due to their extensive cross refs.


11,120,00011,220,000

7,910,000

11,815,000

Single Stage Homes Total: 42,065,000

40 million* single stage gas furnaces were installed in the last twenty years in the US, so the replacement market for these controls should be strong, wherever you are.

*WR Estimate

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50M56U-843 Universal Single Stage Overview

Universal Features & Benefits• Replaces over 430 sku’s• 21D64-2 120v HotRod Ignitor for

replacing 80v applications (pictured)• Easily identifiable harnesses for

various OEMs• Multiple OEM mounting options • Status & Fault Tri-Color LED indicator• Fault recall/clearing push button • Fault code label on control• Flame current test pins• Twinning capable• 24v & 120v humidifier options

HotRod Ignitor 21D64-2 (included)


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50X57-843 Universal Single Stage Overview

Universal Features & Benefits• Replaces 38 sku’s• Patented parallel connector ports • Multiple OEM mounting options • Easy rollout jumper installation• Fault recall/clearing push button • Status & Fault Tri-color LED indicator• Fault code label on control• Flame current test pins• Twinning capable• 24v & 120v humidifier options


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50M56U-843 Cross-Reference

Cross-Reference1. Download WR Mobile for

most complete and up-to-date cross reference

2. Check the cross-reference list on the side of the box

TECH TIP: When upgrading an 80v board to a 120v board – the ignitor needs to be replaced too.

Orange shading indicates 80V application where ignitor must be changed


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Cross-Reference1. Download WR Mobile for

most complete and up-to-date cross reference

2. Check the cross-reference list on the side of the box

TECH TIP: When upgrading an 80v board to a 120v board – the ignitor needs to be replaced too.

Orange shading indicates 80V application where ignitor must be changed.

50X57-843 Cross-Reference


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50M56U-843 Competitive Comparison

FEATURE Brand X White-Rodgers 50M56U-843

Board cross-references 200 430+

Ignitor voltage covered 120v 80v & 120v

120v Universal (HotRod) Hot Surface Ignitor included ✘ Included

Rollout circuit solution Requires wire installed Easy jumper

Wiring harnesses have easily identifiable ID flags ✘ ✔

Current flame test pins

Twinning capable ✔Unused motor / park terminals 3

Electronic air cleanervoltage connections 120v

Humidifier Voltage connections 120v only 24v & 120v

Multiple OEM mounting options incl. tabs to slide in trays with slots.

Status & fault tri-color LED indicator Green – amber – red

Tri-color LED displays heat/cool/fan status ✔Status & fault code label on control ✘ ✔Fault recall & clearing None Simple push button

White-Rodgers Has More Features

50M56U-843


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50X57-843 Competitive Comparison – No True Competitor Exists! Replace 4 OEM boards with One SKU

Feature Function Benefit

38 Board cross-references

Saves stocking of 4 different OEM boards with just this one Minimizes truck stock

80v & 120v Ignitorvoltage covered Saves stocking of 80v controls covered by this board Minimizes truck stock

Rollout circuit solution Jumper shunt is quick and simple connector for functionality Saves technician time

Current flame test pins Allows technicians to test flame current in real time without taking any wires off for testing

Ensures solid connections to get quick, accurate reading

Twinning capable Provides simple to connect terminals to allow multiple units to work simultaneously

Greater productusage capability

2 Unused 24v motor / park terminals

Offers places to put extra motor lead wires without having to cut off connectors and seal wire ends

Gives technician quickway to secure extra wires

Electronic air cleaner120v connection Allows for EAC to be powered up when fan comes on Saves time connecting

an IAQ product

Humidifier voltage120v & 24v connections

Allows for Humidifier to com on when call for heat is made

Saves time connectingan IAQ product

Multiple OEM mountingoptions incl. tabs toslide in trays with slots.

Provides different style mounting to replace control as OEM was mounted

Saves techs time in trying to remount control in new way

Status & fault tri-colorLED indicator

Tri-Color LED displays fault codes of last 5 control errors that occurred during the last 14 days.

Allows technician to seefault history & troubleshoot

Tri-color LED displays heat/cool/fan status

Tri-Color LED displays operation status while in operation and in standby mode

Gives technician real-time operation status

50X57-843


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• March 11, 2019– “Thanks guys! Worked great with easy

installation for me.”

• November 26, 2013– “I keep this on my service truck instead

of 20+ different OEM boards. Fits a lot of different makes and models of furnaces.”

• January 26, 2013– “Easy to install and started up without a

problem”

• February 8, 2020– “Easy to install and tech service on the

phone is very helpful.”

• October 10, 2012– Works great. I installed it tonight and it is

working like a charm.

What Our Customers are Saying About White-Rodgers Universal Single Stage IFCs


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WR Mobile App

Always up-to-date and easy to use:

• Mobile App• White-Rodgers Website

Your resource for:• Product information and spec sheets• Complete Cross Reference• OEM compatibility• Installation information and videos• Wiring diagrams

Download:• Go to your app store• Type in WR Mobile• Install the app

OR

• Open your camera• Hold it over the QR code• Tap “Open” on the

pop-down• Install the app


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WR Mobile App

Easy to use!

Search by OEM, Competitive, or White-Rodgers Model Number

Scrollable Product List WR ReplacementProduct Number


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White-Rodgers Cross Reference

Go to: www.whiterodgers.com• Hover over Tools & Resources• Click on: White-Rodgers Cross Reference/Product Information• Enter the Model Number or click on: Search Replacement

Heating Controls by Major OEM Brand


http://www.whiterodgers.com/

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Wholesale Resource Site

Access useful resources to grow your business.

Visit: https://climate.emerson.com/en-us/brands/white-rodgers/white-rodgers-wholesaler-resource-center

You’ll find videos, stocking lists and product launch information for the following product families:• Heating Controls• Cooling Controls• Sensi Smart™ Thermostats• Traditional Thermostats• Contractor Rewards• Product Merchandising


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Why Contractors Trust White-Rodgers

Industry Leading Products• Used by more OEM’s• Offering the widest range of

Universal Replacement ControlsEase of Installation• Simple, easy to understand

instructionsProduct Reliability• Quality Control assures reliable

productsAffordable• Competitive pricingSupported by Knowledgeable Representatives• Contractor direct phone support


Technical50M56U-843 for PSC Blowers 50X57-843 for ECMx Blowers

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Where Does the Term “IFC” Come From?

IFC stands for “Integrated Furnace Control”. Originally, furnaces had controls that operated the ignition and fuel burning separately from the Blower Motor. IFCs brought these functions together, so that one control monitors all functions.

IFC’s can:• Monitor flue blockage for safety• Operate an inducer motor• Provide gas ignition and monitor to ensure burning• Monitor furnace from overheating for safety• Turn the fan blower on and off at the correct time• Oversee all thermostat requests• Provide status codes to verify current state• Provide fault codes to help troubleshoot

50M56U-843


TECH TIP: Universal IFC’s can replace more than 1 OEM control by being built to accommodate design differences, sometimes using adapter harnesses.

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IFC History

1935 1968 1988 1990

Era when non-integrated controls operated furnaces

• An electric fan to distribute the heated air through ductwork of a coal fired furnace within the home is patented.

• Mechanical temperature switches are used to control when the blower turns on/off.

• An Intermittent Spark ignition system is introduced to replace Standing Pilot Systems.

• A Furnace Blower Control that uses a microprocessor to time the fan blower on & off instead of a temperature sensing control is patented.

• A fully Integrated Furnace Control that controls the gas valve, gas ignition, flame sensing, blower fan operation, induced draft sensing, & limit functions is patented.

• IFC’s can turn on blowers and turn off gas in an overheating event.


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Ignition Types Gas Valve Stages Blower Motor Types

IFC Options / Differences

• Hot Surface Ignition is operated with either Silicon Carbide of Silicon Nitride.

• Direct Spark Ignition uses a spark probe to directly ignite burner gas.

• Proven or Intermittent Pilot first checks for pilot ignition prior to opening up the main gas valve.

The most popular Furnaces manufactured are single stage but are also made with 2 heating stages or more. The most common are:

• Single Stage use a single stage gas valve.

• Two-Stage use a 2-stage gas valve. Usually staged open at 40% and then 100%

• PSC or Permanent Split Capacitor motors were regulated out of new residential furnaces made after July 3rd, 2019

• ECMx or X-13 motors use a controller to maintain constant torque on the blower shaft.

• ECMv or Constant Speed motors use a controller to maintain a constant airflow speed.


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Universal Control Coverage

One Control vs Multiple OEMSMultiple controls can be replaced with one Universal Control using different methods:

• Additional circuits within the control• Duplicate terminals for different

OEM’s• Adapter harnesses to connect to

different sku’s• Dipswitches located on the control• Jumper pins located on the control

White-Rodgers considers every aspect to make Universal Controls as versatile and broad in coverage as possible.

Exclusive patented dual plug-in ports

Pins for OEM circuit

Flame Sense in 11-Pin inline port and on individual spade

Wiring adapter harnesses

Dipswitches for Single or 2-Stage applications


TECH TIP: White-Rodgers simplifies methods to keep the installation as clear and easy as possible.

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80v vs 120v Hot Surface Ignitors

From 1997 to 2006, a few furnace manufacturers used 80v AC to power Hot Surface Ignitors. However, there are no markings on these HSI’s to indicate voltage. To verify the correct existing HSI voltage, check the installed control board model.

If an HSI control board is 80v AC, it can be upgraded to 120v AC, but the ignitor and the control board should be replaced simultaneously. Failure to replace an 80v ignitor when upgrading the control to 120v will result in ignitor overvoltage and failure.

Hot Surface Ignitors generally have no special composition to make them furnace specific.

Replacement requirements:• Voltage matches the control board

HSI output• Ignitor location matches

OEM location

Even Silicon Carbide hot surface ignitors can be upgraded to Silicon Nitride with a White-Rodgers Universal HotRod Ignitor.


TECH TIP: White-Rodgers offers a Universal Single Stage 80v HSI control to be able to change the control while leaving the ignitor.

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Single Stage Universal IFC50M56U-843 for PSC BlowersTechnical Overview

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White-Rodgers Universal 50M56U-843 Components

120v Components:12. PSC Blower Heat Spade13. PSC Blower Cool Spade14. PSC Blower Fan Only

Spade15. 3 Extra Blower Speed

Park Spades16. 120v EAC Spade17. Line 120v Input Spade18. 120v Transformer Spade19. 120v Humidifier Spade20. 7 Line Neutral Spades 21. 4 pin Inducer/Ignitor

Molex Plug

24v Components:1. Twinning Spade2. Flame Sense Spade3. 12 pin Molex Connector4. 24v Thermostat Bus5. Roll-out Jumper6. 24v Humidifier Spade7. 5a Low Voltage Fuse8. Status / Fault LED9. Fault Recall Button10. Heat On/Off, Fan

Dipswitches11. Flame Sense Test Pins

4

2

3

1

9

5

8

6

710

11

12

13

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15 16 17 18 1920

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50M56U-843


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Understanding Control Plug-In Variations


Early IFC’s had fewer pins in connectors and more individual wires going directly to the board. More recent models utilize 11 or 12 pin connectors.

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Harness Selection Made Easy


TECH TIP: Once the board has been cross-referenced, instructions clearly show which harness is needed for simple conversion.

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Adjustable Fan Delay Dipswitch Functions

Control has 1 set of dipswitches:

1. Cool off delay2. Heat on delay3. & 4. Heat off delay

Dipswitch Settings

White-Rodgers identifies the dipswitch settings with a label on the control.

Dipswitches Pictured


TECH TIP: Power must be cycled after dipswitch settings are made.

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3 Easy-to-Install Mounting Options

Mounting OptionsThere are 3 different mounting options:

1. 3 tabs match some OEM models with a tray that allows for the top & bottom tab to slide into tray slots.

2. 3x ½” screws are provided for attaching using the holes in the 3 tabs.

3. 4 corner mounting holes designed to match some boards being replaced give multiple options. 4x 1” screws are provided.

1. Tabs can be easily snipped off as needed

50M56U-843


TECH TIP: White-Rodgers raised molded base provides space between the board and the unit mounting plate.

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Single Stage Universal IFC50X57-843 for ECMx BlowersTechnical Overview

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4

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6

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White-Rodgers 50X57-843 Components

14. X-13 24v Blower High Cool Spade

15. X-13 24v Blower Heat Spade

16. X-13 24v Blower Fan Only Spade

17. X-13 24v Blower Low Cool Spade

18. Two 24v Blower Speed Park Spades

120v Components:

19. 120v EAC Spade20. 120v Humidifier Spade21. 120v Blower Spade22. 120v T/former Spade23. Line 120v Input Spade24. 7 Line Neutral Spades 25. Dual 2 & 4 pin Inducer-

Ignitor Molex Plugs

24v Components:

1. Twinning Spade2. Fan Adjustment

Dipswitches3. Fault Recall Button4. Status / Fault LED5. 24v Thermostat Bus6. 24v Humidifier Spade7. Dual 11 pin In-line &

12 pin Molex Connectors

8. Roll-out Jumper9. Flame Sense Spade10. 24v Transformer

Spades11. 3a Low Voltage Fuse12. Flame Sense Test

Pins13. X-13 24v Blower

Common

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50X57-843

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1112

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Patented Parallel Connectors

Simplifying Installation• The 50X57-843 main harness connector has both an In-line and Molex plug parallel with each other on the same control

• Both style Inducer/Ignitor Molex connectors are also on-board

• Parallel connectors allow for a quick installation with multiple OEM brand controls, simplifying the process and eliminating the need for a harness adapter.

1. Inducer/Ignitor connectors2. Main Harness connectors

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1


TECH TIP: The patented parallel connector is a White-Rodgers exclusive.

Patent: US 9689569 B2

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Carrier Connections Trane Adapters Lennox Harness

• Carrier systems require spade connectors to attach the 24v wiring

• Trane requires the 24v common ECMx motor wire spade to be converted to 1/4”

• Trane and York require a jumper shunt installed

• Lennox requires 2 harnesses adapters & the flame sensor wire connects to a spade connector.

50X57-843 Adapters for Different OEMs

Red 24v power

Blue 24v common

Flame Sensor wire connection


TECH TIP: White-Rodgers uses the simplest way to adapt to various OEMs.

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Adjustable Fan Delay & Speed Dipswitch Functions

White-Rodgers identifies the dipswitch settings with a label on the control.

Control has 1 set of Dipswitches:

1. & 2. Heat off delay3. & 4. Fan

Dipswitch settings

Dipswitches Pictured


TECH TIP: Power must be cycled after dipswitch settings are made.

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Multiple Easy-to-Install Mounting Options

Mounting Options1. 3 tabs match Carrier/ICP

OEM models with a tray that allows for the top & bottom tab to slide into tray slots.

2. 3x ½” screws are provided for attaching using the holes in the 3 tabs.

• Tabs can be easily snipped off as needed

3. The cover can be removed, and stand-off tabs installed on the back of the control board to match OEM. 50X57-843


TECH TIP: White-Rodgers raised molded base provides space between board and unit mounting plate.

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Testing Flame Current with 50X or 50M

Understanding Test Pins2 pins extend from the control board to the surface of the black cover.

To Test: • The furnace must have a call

for heat and the burners producing flame.

• Set a multimeter to vDC and place a meter probe on each pin.

• Convert vDc to MicroAmpsusing a 1:1 ratio.

• A good flame sense reading will be between 1.0 – 5.0 μA.

50X57-843

50M56U-843

Test Pins Pictured


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50M56U-843

Twinning with 50X or 50M

• Two 50X57-843 OR two 50M56U-843 controls can be connected to operate simultaneously.

• Twinning requires a connection of the twin terminal on both boards using an 18ga wire.

• The board with the thermostat connection will fully function including the LED indicator and dipswitch settings. The twinned board will operate simultaneously.

• The twinned unit can be wired for heat to come on by utilizing the “W” terminal, either with the 1st unit or as a 2nd stage.

50X57-843Twinning Pictured


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Roll-Out Jumper on 50X and 50M

Jumper PurposeAll Trane & American Standard units as well as York P3UR/PCLU units are manufactured without a separate rollout circuit.

To accommodate these units a jumper is required to complete the circuit that would otherwise be open in the 12 pin Molex connector.

Without the jumper, the control will flash 5 red flashes indicating the rollout circuit is open.

50M56U-843

50X57-843

Place Jumper onto 2-pin header when applicable

Shunt Jumper Pictured


The shunt jumper comes in a bag that is taped on the front of the control cover.

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Troubleshooting with 50X and 50M

Troubleshooting is made easy with fault code labels right on the cover, and complementary Tri-Color LEDs.

A Fault button allows for:

• Recall of the last 5 faults• Fault code erasure• Place the control into

the Self Test mode

50M56U-843

50X57-843

Tri-Color LEDPictured


Install50M56U-843 for PSC Blowers

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Installing the 50M56U-843 for PSC Blowers

What’s In The Box?• 50M56U Integrated Furnace Control• 21D64-2 HotRod Universal Ignitor (120V)• 3 - Main Harness Assemblies (A, B, M)• 4 - Ignitor/Inducer Harness Assemblies

(C,D,E, H) • 1 - Rollout Shunt Jumper• 1 - Carrier Blower Motor Neutral Adapter• 4 - White 8.5” Long Wiring Extensions• 4 - Plastic Mounting Standoffs• 4 - 1” Sheet Metal Mounting Screws• 3 - ½” Sheet Metal Mounting Screws• 2 - Wire Ties• Installation Instructions


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Installation – Step 1


1 Turn off the power and gas to the furnace and remove the access panels.

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2 Check the part number on the part replaced against the 50M56U Cross Ref on the package.



Orange shading indicates 80V application where ignitor must be changed.

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3 Take a photo of the existing setup.



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4 Remove the Wiring:• Flame sense (if present)• 12 pin Molex• Disconnect thermostat wiring• Remove Blower Motor wires

‒ Heat, cool, continuous fan (if present)• Blower Motor Park/ Neutral (set aside as group)• Remove 120v Line Voltage and Neutral • Disconnect 120v Transformer and Neutral• Remove Inducer Ignitor plug• Remove the board



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5 Install rollout shunt jumper on applicable models, including Trane, American Standard, and York P3UR/PCLU units.



The shunt jumper comes in a bag that is taped on the front of the control cover.

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6 Set dipswitches to existing unit settings. Consult the install instructions for setting direction.



TECH TIP: The switches can be pressed with a screwdriver.

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7 Mount the new board. Select corner mounts or tabs, depending on application.



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8 Refer to instruction sheet to determine if harnesses are required for your application. Connect if required.



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9 Wire the New Board:• Connect Inducer/Ignitor Plug• Attach 120V Transformer and Neutral• Attach 120V Line Voltage and Neutral• Connect Blower Heat, Cool, and Fan

‒ Connect Park and Neutral• Connect Thermostat wires• Plug-in 12 pin Molex• Connect Flame Sense (If present)• Zip tie any loose wiring



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Upgrade to 120V Ignitor, if necessary.



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TECH TIP: Always a good practice to swap out the ignitor, and a must with 80V applications.

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If using 120V Ignitor, ensure you install it in the same location as the old ignitor, with the proper bracket. Splice two HotRod wires to the existing ignitor wiring using provided wire nuts.



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Tape down door switch. Reconnect the power and gas to the furnace and enter Self Test mode.



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Enter Self Test mode by pressing fault recall button twice within three seconds. LED will flash last faults in red.During Self Test, the LED will flash between green, amber, and red, while doing a systems check. When complete, control goes to stand-bye.



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TECH TIP: Hold fault/recall button for 5-10 seconds to erase fault code history.

Verify ignition by making a call for heat. LED will slowly flash amber.If a fault is detected, reference the Tri-Color LED flash code against the fault code list on the control.



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Re-attach furnace panel, and you’re good to go!



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Universal Single Stage IFCs - Emerson US

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