Table Of Contents - American Standard 50A65-475 Manual

Contents
Model Nomenclature .......................................................................................................................................................... 3
Silicon Nitride Ignitor .......................................................................................................................................................... 4
Component Identification - Single Stage 80% Upflow/Horizontal ................................................................................... 6
Integrated Furnace Control - CNT02854 - Superseded to CNT03076 .............................................................................. 8
Integrated Furnace Control - CNT03076 ............................................................................................................................ 9
Single Stage 50A65-474 Sequence of Operation .............................................................................................................. 10
Wiring Schematic - Single Stage 80% and 90% ................................................................................................................ 11
Component Identification - Two Stage 80% Upflow/Horizontal ...................................................................................... 12
Integrated Furnace Control - CNT03077 ............................................................................................................................ 13
Two Stage 50M61-495 Sequence of Operation ................................................................................................................. 14
Wiring Schematic - Two Stage Heat .................................................................................................................................. 15
Component Identification - Two Stage/Two Speed Vent Motor and Variable Speed Indoor Motor .............................. 16
Integrated Furnace Control - CNT03078 ............................................................................................................................ 17
Two Stage Variable Speed Sequence of Operation .......................................................................................................... 18
Wiring Schematic - Two Stage Variable Speed Indoor Blower ........................................................................................ 19
Component Identification - Two Stage 90% Variable Speed Vent Motor and Four Speed Indoor Motor ..................... 20
Integrated Furnace Control - CNT02871 ............................................................................................................................ 21
Variable Speed Vent Motor ................................................................................................................................................. 22
Two Stage 50V65 Sequence of Operation ......................................................................................................................... 24
Two Stage Heat/Variable Speed Vent Motor/Standard Indoor Blower ............................................................................ 25
Component Identification - Two Stage 90% Variable Speed Vent Motor and Variable Speed Indoor Blower ............. 26
Integrated Furnace Control - CNT02536 ............................................................................................................................ 27
Two Stage 50A61 Sequence of Operation ......................................................................................................................... 28
Two Stage Variable Speed Vent Motor and Blower .......................................................................................................... 29
Two Stage/Variable Speed Vent and Variable Speed Blower Motor Models ................................................................... 30
White-Rodgers Self Diagnostic Features ........................................................................................................................... 31
Ignition Control Flash Codes .............................................................................................................................................. 32
Measuring Variable Speed Vent Motor RPM ..................................................................................................................... 33
Variable Speed Vent Motor Models .................................................................................................................................... 34
Diagnosing the Variable Speed Vent Motor with the Variable Speed Troubleshooter ................................................... 35
Diagnosing the Variable Speed Vent Motor/Manual Method ........................................................................................... 38
ECM TM 2 Variable Speed Furnace Motor Quick Check ....................................................................................................... 40
V-Squared Furnace Motor - Control Board Schematic ..................................................................................................... 41
Vent Length Table for Variable Speed Vent Motor Models Only ...................................................................................... 42
Single Wire Twinning - For Models with Twin Terminals ................................................................................................. 43
Manifold Pressure Settings ................................................................................................................................................. 44
Furnace Pressure Switch Settings ...................................................................................................................................... 45
Direct Vent Pressure Switch Connections .......................................................................................................................... 46
Direct Vent Manifold Pressure Check ................................................................................................................................. 46
Cleaning the Air Inducer Stirring Fan ................................................................................................................................. 47
Legend - System Wiring ..................................................................................................................................................... 48
1