York YLUA0078 Installation Operation & Maintenance page 6

SECTION 5 - TECHNICAL DATA ........................................................................................................................43
Operational Limitations (English) ................................................................................................................... 43
Physical Data (English) .................................................................................................................................. 44
Wiring Diagrams ............................................................................................................................................. 60
Dimensions (English) ..................................................................................................................................... 84
Clearances ..................................................................................................................................................... 87
Weight Distribution and Isolator Mounting Positions ...................................................................................... 88
Isolator Information ......................................................................................................................................... 89
SECTION 6 - COMMISSIONING .........................................................................................................................95
Commissioning ............................................................................................................................................... 95
Preparation - Power Off ................................................................................................................................. 95
Preparation - Power On ................................................................................................................................. 96
SECTION 7 - UNIT CONTROLS ........................................................................................................................101
Introduction ................................................................................................................................................... 101
Microprocessor Board .................................................................................................................................. 101
Unit Switch ................................................................................................................................................... 102
Display .......................................................................................................................................................... 102
Keypad ......................................................................................................................................................... 102
Battery Back-Up ........................................................................................................................................... 102
Transformer ................................................................................................................................................. 102
Single System Select and Programming Number of Compressors .............................................................. 102
Status Key .................................................................................................................................................... 103
Display/Print Keys ........................................................................................................................................ 108
Entry Keys .................................................................................................................................................... 116
Setpoints Keys ............................................................................................................................................. 117
Unit Keys ..................................................................................................................................................... 124
SECTION 8 - UNIT OPERATION ......................................................................................................................131
Capacity Control ........................................................................................................................................... 131
Suction Pressure Limit Controls ................................................................................................................... 131
Discharge Pressure Limit Controls ............................................................................................................... 131
Discharge Air Temperature Control .............................................................................................................. 131
Suction Pressure Control ............................................................................................................................. 133
System Lead/Lag ......................................................................................................................................... 134
Compressor Lead/Lag .................................................................................................................................. 134
Anti-Recycle Timer ....................................................................................................................................... 134
Anti-Coincidence Timer ................................................................................................................................ 134
Evaporator Blower Control ........................................................................................................................... 134
Pumpdown Control ....................................................................................................................................... 134
Condenser Fan Control ................................................................................................................................ 137
Load Limiting ................................................................................................................................................ 139
Compressor Run Status ............................................................................................................................... 139
Alarm Status ................................................................................................................................................. 139
BAS/EMS Discharge Air Temperature Reset Using A Voltage Or Current Signal ....................................... 140
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TABLE OF CONTENTS (CONT'D)
FORM 150.73-NM1
ISSUE DATE: 09/04/2020
JOHNSON CONTROLS