American Standard 50M61-495 User Manual

1
Gas Furnace Silicon
Nitride Ignitor Models
Gas Furnace Silicon
Nitride Ignitor Models
• Single and Two Stage Models
• Variable Speed Vent Models
• Variable Speed Blower Motor
• Test Procedures
• Direct Vent
• Single and Two Stage Models
• Variable Speed Vent Models
• Variable Speed Blower Motor
• Test Procedures
• Direct Vent
© 2001 American Standard Inc. All rights reserved.
© 2001 American Standard Inc. All rights reserved.

American Standard 50M61-495 Specifications

General

Brand	American Standard
Model	50M61-495
Category	Control Unit
Language	English

Summary

IFC Diagnostic Codes

Diagnostic Codes

Lists LED flash patterns and their meanings for IFC.

Model Nomenclature

Silicon Nitride Ignitor

Ignitor Composition

Component Identification - Single Stage 80% Upflow/Horizontal

Component Identification - Single Stage 90% Upflow/Horizontal

Integrated Furnace Control CNT2854 – Superseded to CNT03076

Integrated Furnace Control – CNT03076

Single Speed Vent Motor and Standard Four Speed Blower with Single Wire Twinning Feature

Single Stage 50A65-474 Sequence of Operation

Wiring Schematic - Single Stage 80% and 90%

Component Identification - Two Stage 80% Upflow/Horizontal

Integrated Furnace Control – CNT03077

Single Stage Heat – Silicon Nitride Hot Surface Ignitor

Two Stage 50M61-495 Sequence of Operation

Wiring Schematic - Two Stage Heat (White-Rodgers 50M61-495 Series Integrated Furnace Control)

Component Identification - 80% Two Stage/Two Speed Vent Motor and Variable Speed Indoor Motor

Integrated Furnace Control – CNT03078

Variable Speed Vent Motor and Four Speed Indoor Motor

Two Stage Variable Speed Sequence of Operation

Wiring Schematic - Two Stage Variable Speed Indoor Blower

Component Identification - Two Stage 90% Variable Speed Vent Motor and 4 Speed Indoor Motor

Integrated Furnace Control – CNT2871

Variable Speed Vent Motor and Standard Four Speed Blower

Variable Speed Vent Motor

How Does It Learn?

Explains the adaptive learning routine of the variable speed vent motor.

Two Stage 50V65 Sequence of Operation

Wiring Schematic - Two Stage Heat/Variable Speed Vent Motor/Std. Indoor Blower

Component Identification - Two Stage 90% Variable Speed Vent Motor and Variable Speed Indoor Blower

Integrated Furnace Control – CNT02536

Two Stage 50A61 Sequence Of Operation

Wiring Schematic - Two Stage Variable Speed Vent Motor and Blower

Two Stage V/S Vent and V/S Blower Motor Models

Sequence of Operation

Details the operational steps for V/S vent and blower motors.

White-Rodgers Self Diagnostic Features

Fault Diagnostic

Lists fault codes indicated by LED flashes.

Ignition Control Flash Codes

Measuring Variable Speed Vent Motor RPM

Measurement Procedures and Specifications

Provides procedures, formulas, and RPM ranges for measurement.

Diagnosing the V/S Vent Motor with the V/S Troubleshooter

Diagnosing the V/S Vent Motor/Manual Method

Check IFC Green LED Status

Verifies the status of the IFC's green LED.

Perform Jumper Tests

Guides through jumper connections for motor testing.

Verify Motor Lead Voltage

Checks for the presence of 120 VAC at motor leads.

Verify High Speed Operation

Checks if the motor reaches high speed.

Check DC Voltage at Pins

Measures DC voltage between specific pins.

Test Low Pressure Switch Function

ECM™ 2 Variable Speed Furnace Motor Quick Check

Blower Motor Will Not Run

Provides steps to diagnose why the blower motor does not run.

Jumper Motor Control Board Terminals

Jumper Low Voltage Harness Pins

Check High Voltage Plug and Jumper

Manifold Pressure Settings

Single Stage Settings

Two Stage Settings

Specific Valve Settings

Furnace Pressure Switch Settings