American Standard CNT03077 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 CNT03077 Specifications

General

Brand	American Standard
Model	CNT03077
Category	Control Unit
Language	English

Summary

IFC Diagnostic Codes

Diagnostic Codes Overview

Silicon Nitride Ignitor Components

SiNi Ignitor Abbreviation and Composition

Explains the SiNi abbreviation and the ignitor's material composition.

Silicon Nitride Ignitor Part Number

Silicon Nitride Ignitor Functionality

AC Sine Wave Cycle Impact on Ignitor

50A65-474 Single Stage Sequence of Operation

Heating Sequence for 50A65-474 Control

Details the step-by-step heating sequence for the 50A65-474 control.

Wiring Schematic: Single Stage Furnace Models

50M61-495 Two Stage Sequence of Operation

Heating Sequence for 50M61-495 Control

Details the heating sequence for the 50M61-495 two-stage furnace control.

Wiring Schematic: Two Stage Heat Furnace

50M61-495 Series Control Wiring

50V61 Variable Speed Sequence of Operation

50V61 Series Furnace Control Operation

Describes the operational sequence for the 50V61 variable speed furnace control.

Wiring Schematic: Two Stage Variable Speed Blower

Variable Speed Vent Motor Learning Process

Adaptive Learning Routine Explained

Explains the adaptive learning routine for motor speed optimization.

50V65 Variable Speed Sequence of Operation

50V65-495 Furnace Control Operation

Details the heating sequence for the 50V65-495 variable speed furnace control.

Wiring Schematic: Two Stage Heat/Variable Speed Motors

Integrated Furnace Control CNT02536 Details

CNT02536 DIP Switch Settings for Heat Off Delay

50A61 Sequence of Operation

50A61-605 Furnace Control Operation

Describes the heating sequence for the 50A61-605 two-stage furnace control.

Self-Diagnostic Features of IFC

IFC LED Flash Rates for Operation

IFC Fault Diagnostic Codes and Meanings

Lists fault codes indicated by LED flashes and their meanings.

Ignition Control Flash Code Reference

Flash Code Reference Table

Ignition Control Flash Code Comparison Across Models

Fault Action Summary by Part Number

Measuring Variable Speed Vent Motor RPM

RPM Measurement Tools and Connections

Details required tools and how to connect a meter for RPM measurement.

Variable Speed Vent Motor Diagnostics

V/S Motor LED Status and Fault Indicators

Diagnosing V/S Vent Motor with Troubleshooter

Variable Speed Troubleshooter Overview and Switch

Describes the variable speed draft inducer troubleshooter and its switch.

Manual Diagnosis: V/S Vent Motor

Initial Diagnostic Checks for V/S Motor

Covers checks for IFC board LED, AC voltage, and DC voltage.

Manual Diagnosis: V/S Vent Motor (Continued)

V/S Troubleshooter Switch Operation Tests

Tests motor operation at high speed and checks voltage inputs.

V/S Motor Pressure Switch Testing

ECM™ 2 Motor Quick Check

Troubleshooting: ECM™ 2 Motor Not Running

Provides steps to diagnose why the ECM motor fails to start.

ECM™ 2 Motor Quick Check (Continued)

ECM™ 2 Motor High Voltage Plug Pinout Check

V-Squared Motor Control Board Schematic

V-Squared Control Board Pinout and Dip Switches

Details terminal connections and dip switch settings for the control board.

Manifold Pressure Settings and Adjustments

Gas Valve Pressure Settings for Fuel Types

Furnace Pressure Switch Settings

Pressure Switch Settings by Furnace Model

Direct Vent Pressure Switch Connections

Direct Vent Manifold Pressure Check Procedure

Direct Vent Manifold Pressure Check Method

Manifold Pressure Check with Burner Box Reference

System Wiring Legend

Terminal Designations, Types, and Connections

Defines wire terminals, their types, and system component connections.