York YLUA0248 Series Installation Operation & Maintenance page 6

Refrigerant Charge ......................................................................................................................................... 40
Filter Driers/ Sight Glasses/ TXVs .................................................................................................................. 40
Refrigerant Piping Notes ................................................................................................................................ 41
Control Wiring ................................................................................................................................................. 43
SECTION 5 - TECHNICAL DATA ........................................................................................................................45
Operational Limitations (English) ................................................................................................................... 45
Physical Data (English) .................................................................................................................................. 46
Electrical Data ................................................................................................................................................ 47
Wiring Diagrams ............................................................................................................................................. 54
Dimensions (English) ..................................................................................................................................... 78
Clearances ..................................................................................................................................................... 81
Weight Distribution and Isolator Mounting Positions ...................................................................................... 82
Isolator Information ......................................................................................................................................... 83
SECTION 6 - COMMISSIONING .........................................................................................................................89
Commissioning ............................................................................................................................................... 89
Preparation - Power Off ................................................................................................................................. 89
Preparation - Power On ................................................................................................................................. 90
SECTION 7 - UNIT CONTROLS ..........................................................................................................................95
Introduction ..................................................................................................................................................... 95
Microprocessor Board .................................................................................................................................... 95
Unit Switch ..................................................................................................................................................... 96
Display ............................................................................................................................................................ 96
Keypad ........................................................................................................................................................... 96
Battery Back-Up ............................................................................................................................................. 96
Transformer ................................................................................................................................................... 96
Single System Select And Programming Number Of Compressors ............................................................... 96
Status Key ...................................................................................................................................................... 97
Display/Print Keys ........................................................................................................................................ 102
Entry Keys .................................................................................................................................................... 110
Setpoints Keys ............................................................................................................................................. 111
Unit Keys ..................................................................................................................................................... 118
SECTION 8 - UNIT OPERATION ......................................................................................................................125
Capacity Control ........................................................................................................................................... 125
Suction Pressure Limit Controls ................................................................................................................... 125
Discharge Pressure Limit Controls ............................................................................................................... 125
Discharge Air Temperature Control .............................................................................................................. 125
Suction Pressure Control ............................................................................................................................. 127
System Lead/Lag ......................................................................................................................................... 128
Compressor Lead/Lag .................................................................................................................................. 128
Anti-Recycle Timer ....................................................................................................................................... 128
Anti-Coincidence Timer ................................................................................................................................ 128
Evaporator Blower Control ........................................................................................................................... 128
Pumpdown Control ....................................................................................................................................... 128
Condenser Fan Control ................................................................................................................................ 132
Load Limiting ................................................................................................................................................ 133
6
TABLE OF CONTENTS (CONT'D)
FORM 150.73-NM2
ISSUE DATE: 09/07/2020
JOHNSON CONTROLS