York YLUA0078 Installation Operation & Maintenance page 7

FORM 150.73-NM1
ISSUE DATE: 09/04/2020
SECTION 9 - SERVICE AND TROUBLESHOOTING .....................................................................................141
Clearing History Buffers................................................................................................................................ 141
Service Mode - Outputs ............................................................................................................................... 141
Service Mode - Condensing Unit Configuration ..........................................................................................141
Service Mode - Analog and Digital Inputs .................................................................................................... 142
Control Inputs/Outputs ................................................................................................................................. 143
Checking Inputs and Outputs ....................................................................................................................... 145
Optional Printer Installation .......................................................................................................................... 149
SECTION 10 - MAINTENANCE .........................................................................................................................153
Important ...................................................................................................................................................... 153
Compressors ................................................................................................................................................ 153
Condenser Fan Motors ................................................................................................................................. 153
Condenser Coils ........................................................................................................................................... 153
Operating Parameters .................................................................................................................................. 153
On-Board Battery Back-Up ........................................................................................................................... 153
Overall Unit Inspection ................................................................................................................................. 153
ISN Control ................................................................................................................................................... 154
BACnet and Modbus Data Communication .................................................................................................. 157
JOHNSON CONTROLS
TABLE OF CONTENTS (CONT'D)
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