UNT Controller—Unitary Controller (UNT) 3
Troubleshooting Page 61
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Hardware Installation Inspection 61
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Tools Needed for Troubleshooting 61
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Installation Checkout *61
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Troubleshooting the UNT Controller with HVAC PRO for Windows *67
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Troubleshooting the N2 Bus 69
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Zone Bus Troubleshooting--HVAC PRO for Windows 70
Ordering Information 71
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Johnson Controls Code Numbers 71
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Vendor Code Numbers *73
Specifications 77
Appendix A: Precautions for Rooftop Installations 79
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Environmental Information 79
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Installation Requirements *79
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Electrical Noise in Rooftop Units *81
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Nuisance Resets in Rooftop Units *82
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Considerations for Gas Ignition *84
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Considerations for Specific Rooftop Units *88
Appendix B: UNT100/101 91
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What’s Different About the UNT100/101 91
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UNT100/101 Terminal Designations 91
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Grounding and Isolation UNT100/101 93
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Binary Inputs *94
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Binary Outputs 94
* Indicates those sections where changes have occurred since the last printing.
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