Johnson Controls YORK YLUA0078Z Series - Page 7

JOHNSON CONTROLS
7
FORM 150.73-NM1
ISSUE DATE: 07/03/2024
Section 9: Service and troubleshooting ............................................................................................................149
Clearing history buffers.................................................................................................................................149
Service mode outputs ...................................................................................................................................149
Service mode condensing unit configuration ................................................................................................150
Service mode analog and digital inputs ........................................................................................................150
Control inputs and outputs ...........................................................................................................................151
Checking inputs and outputs ........................................................................................................................153
Optional printer installation ........................................................................................................................... 157
Section 10: Maintenance.....................................................................................................................................161
Important ......................................................................................................................................................161
Compressors oil level check .........................................................................................................................161
Oil analysis ...................................................................................................................................................161
Condenser fan motors .................................................................................................................................. 161
Condenser MCHX ........................................................................................................................................161
Microchannel coil cleaning ...........................................................................................................................161
Cleaning procedure required for standard and environment guard microchannel coils ............................... 162
Cleaning procedure for environment guard premium microchannel coils ....................................................162
Steps to touch-up small sections of finned coil surface ................................................................................163
Steps to touch-up end (dead) tubes and condenser coil headers: ...............................................................163
Materials required: ........................................................................................................................................163
Chilled liquid system maintenance ...............................................................................................................164
Scheduled maintenance ............................................................................................................................... 164
Chiller / compressor operating log ................................................................................................................164
Evaporator freeze damage ........................................................................................................................... 164
Glycol concentration ..................................................................................................................................... 164
Winterization .................................................................................................................................................164
Before applying power to the chiller, ensure the chilled liquid system is filled ............................................. 164
Removing water/glycol from the evaporator ................................................................................................. 165
Operating parameters ..................................................................................................................................165
On-board battery backup ..............................................................................................................................165
Brazed plate heat exchanger (evaporator) heater ........................................................................................165
Overall unit inspection ..................................................................................................................................165
BAS control ..................................................................................................................................................166
BACnet and Modbus data communication ...................................................................................................169
Table of contents (cont’d)