American Standard CNT03078 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 CNT03078 Specifications

General

Brand	American Standard
Model	CNT03078
Category	Control Unit
Language	English

Summary

IFC Diagnostic Codes

Silicon Nitride Ignitor

Component Identification

Single Stage 80% Upflow/Horizontal

Identifies components within a single stage 80% upflow/horizontal furnace.

Single Stage 90% Upflow/Horizontal

Identifies components within a single stage 90% upflow/horizontal furnace.

Two Stage 80% Upflow/Horizontal

Identifies components within a two stage 80% upflow/horizontal furnace.

80% Two Stage/Two Speed Vent Motor and Variable Speed Indoor Motor

Two Stage 90% Variable Speed Vent Motor and 4 Speed Indoor Motor

Two Stage 90% Variable Speed Vent Motor and Variable Speed Indoor Blower

Furnace Sequence of Operation

Single Stage 50A65-474 Sequence of Operation

Two Stage 50M61-495 Sequence of Operation

Two Stage Variable Speed Sequence of Operation

Two Stage 50V65 Sequence of Operation

Two Stage 50A61 Sequence Of Operation

Two Stage V/S Vent and V/S Blower Motor Models Sequence of Operation

Wiring Schematics

Single Stage 80% and 90%

Provides the wiring diagram for single stage 80% and 90% furnaces.

Two Stage Heat (50M61-495 Series IFC)

Wiring diagram for two stage heat using the 50M61-495 IFC.

Two Stage Variable Speed Indoor Blower

Provides the wiring diagram for two stage variable speed indoor blowers.

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

Wiring diagram for two stage heat with variable speed vent and standard indoor blower.

Two Stage Variable Speed Vent Motor and Blower

Provides the wiring diagram for two stage variable speed vent motor and blower.

Variable Speed Vent Motor

White-Rodgers Self Diagnostic Features

Ignition Control Flash Codes

Diagnosing the Variable Speed Vent Motor

ECM™ 2 Variable Speed Furnace Motor Quick Check

Manifold Pressure Settings

Furnace Pressure Switch Settings

Legend – System Wiring