JOHNSON CONTROLS 7
FORM 150.62-NM8 (1020)
SECTION 2 - UNIT CONTROLS .....................................................................................................81
INTRODUCTION .........................................................................................................................................81
IPU II AND I/O BOARDS ............................................................................................................................81
UNIT SWITCH .............................................................................................................................................82
DISPLAY ......................................................................................................................................................82
KEYPAD.......................................................................................................................................................82
BATTERY BACK-UP...................................................................................................................................82
TRANSFORMER ........................................................................................................................................82
SINGLE SYSTEM SELECT AND PROGRAMMING # OF COMPRESSORS........................................82
STATUS KEY..............................................................................................................................................83
General Status Messages......................................................................................................................83
Fault Status Messages ..........................................................................................................................85
Unit Warning...........................................................................................................................................87
STATUS KEY MESSAGES.........................................................................................................................88
DISPLAY/PRINT KEYS ..............................................................................................................................89
Oper Data Key ........................................................................................................................................89
Oper Data Quick Reference List ...........................................................................................................92
Print Key .................................................................................................................................................93
Operating Data Printout.........................................................................................................................93
History Printout ......................................................................................................................................94
History Displays .....................................................................................................................................94
Software Version ....................................................................................................................................97
ENTRY KEYS ..............................................................................................................................................98
Up and Down Arrow Keys .....................................................................................................................98
Enter/Adv Key.........................................................................................................................................98
SETPOINTS KEYS......................................................................................................................................99
Cooling Setpoints ..................................................................................................................................99
Leaving Chilled Liquid Control .............................................................................................................99
Return Chilled Liquid Control .............................................................................................................100
Schedule/Advance Day Key ................................................................................................................100
Program Key.........................................................................................................................................102
UNIT KEYS ...............................................................................................................................................107
Options Key ..........................................................................................................................................107
CLOCK....................................................................................................................................................... 111
SECTION 3 - UNIT OPERATION ..................................................................................................113
CAPACITY CONTROL..............................................................................................................................113
SUCTION PRESSURE LIMIT CONTROLS ............................................................................................113
DISCHARGE PRESSURE LIMIT CONTROLS.......................................................................................113
LEAVING CHILLED LIQUID CONTROL.................................................................................................113
Leaving Chilled Liquid Control Override to Reduce Cycling...........................................................114
RETURN CHILLED LIQUID CONTROL..................................................................................................114
SYSTEM LEAD/LAG.................................................................................................................................116
COMPRESSOR LEAD/LAG.....................................................................................................................116
TABLE OF CONTENTS (CONT'D)
