American Standard *UD Series Operation Manual page 3

Contents
- continued
Manifold Pressure Settings .........................................................................................................................................
Direct Vent Manifold Pressure Check .........................................................................................................................
Determining Natural Gas Furnace Input ....................................................................................................................
Single Stage Twinning Kit ...........................................................................................................................................
Field Wiring Diagrams - Single Stage and Two Stage Thermostats .......................................................................
Two Stage Twinning Kit ..............................................................................................................................................
Fields Wiring Diagram - Twinning UD-R Furnaces .................................................................................................
Single Wire Twinning - For Models with Twin Terminals .........................................................................................
Radiant Sense Ignition Controls .................................................................................................................................
Identifying Radiant Sense Controls ............................................................................................................................
Radiant Energy Sensor ................................................................................................................................................
50A52-100 Sequence of Operation .............................................................................................................................
Wiring Schematic - Version 1 Radiant Sense Control ..............................................................................................
50A52-100 Sequence of Operation .............................................................................................................................
Wiring Schematic - Version 2 Radiant Sense Control ..............................................................................................
50A52-100 Sequence of Operation .............................................................................................................................
Wiring Schematic - Version 3 Radiant Sense Control ..............................................................................................
50A52-100/101/102 Sequence of Operation ...............................................................................................................
Wiring Schematic - Version 4 Radiant Sense Control ..............................................................................................
Troubleshooting Procedures .......................................................................................................................................
• 50A50 Flow Chart 1 .................................................................................................................................................
• 50A50 Flow Chart 2 ..................................................................................................................................................
• 50A50 Flow Chart 3 .................................................................................................................................................
• 50A50 Flow Chart 4 .................................................................................................................................................
• 50A50 Flow Chart 5 .................................................................................................................................................
• 50A51 Flow Chart 1 ..................................................................................................................................................
• 50A51 Flow Chart 2 ..................................................................................................................................................
• 50A51 Flow Chart 3 ..................................................................................................................................................
• 50A51 Flow Chart 4 ..................................................................................................................................................
• 50A51 Flow Chart 5 ..................................................................................................................................................
• 50A52 Flow Chart 1 ..................................................................................................................................................
• 50A52 Flow Chart 2 ..................................................................................................................................................
• 50A52 Flow Chart 3 ..................................................................................................................................................
• 50A52 Flow Chart 4 ..................................................................................................................................................
Legends - System Wiring ...........................................................................................................................................
Models maybe an A or T or F
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