York YLAA0195HE, Manual, Page: 7 / 206

7
JOHNSON CONTROLS
FORM 150.72-NM3 (1020)
ISSUE DATE 10/05/2020
CHECKING SUPERHEAT AND SUBCOOLING ...................................................................................135
LEAK CHECKING ....................................................................................................................................135
UNIT OPERATING SEQUENCE .............................................................................................................136
SECTION 7 – UNIT CONTROLS ...................................................................................................................137
INTRODUCTION ......................................................................................................................................137
IPU II and I/O Boards .........................................................................................................................137
Display ................................................................................................................................................138
Keypad ................................................................................................................................................138
Battery Back-up .................................................................................................................................138
Transformer .......................................................................................................................................138
Programming # of Compressors ......................................................................................................138
“STATUS” KEY ........................................................................................................................................139
Unit Status ..........................................................................................................................................139
General Status Messages .................................................................................................................139
Fault Safety Status Messages ..........................................................................................................141
Status Key Messages ........................................................................................................................144
DISPLAY/PRINT KEYS ...........................................................................................................................145
Oper Data Key ....................................................................................................................................145
Oper Data Quick Reference List .......................................................................................................148
Print Key .............................................................................................................................................149
Operating Data Printout ....................................................................................................................149
History Printout .................................................................................................................................150
History Displays ................................................................................................................................150
Software Version ...............................................................................................................................152
“ENTRY” KEYS .......................................................................................................................................153
Up and Down Arrow Keys .................................................................................................................153
Enter/ADV Key ...................................................................................................................................153
“SETPOINTS” KEYS ...............................................................................................................................154
Cooling Setpoints ..............................................................................................................................154
Leaving Chilled Liquid Control ........................................................................................................154
Return Chilled Liquid Control ..........................................................................................................155
Remote Setpoints Control ................................................................................................................155
SCHEDULE/ADVANCE DAY KEY..........................................................................................................155
PROGRAM KEY .......................................................................................................................................157
System Trip Volts ...............................................................................................................................158
Unit Trip Volts ....................................................................................................................................159
PROGRAM KEY LIMITS AND DEFAULT ..............................................................................................159
SETPOINTS QUICK REFERENCE LIST ...............................................................................................160
“UNIT” KEYS ..........................................................................................................................................161
Options Key .......................................................................................................................................161
CLOCK ......................................................................................................................................................165
UNIT KEYS OPTIONS PROGRAMMING QUICK REFERENCE LIST ...............................................166
TABLE OF CONTENTS (CONT’D)