JOHNSON CONTROLS
8
FORM 150.67-NM2 (209)
SECTION 8 – UNIT OPERATION ....................................................................................................................157
CAPACITY CONTROL ..............................................................................................................................157
SUCTION PRESSURE LIMIT CONTROLS ..............................................................................................157
DISCHARGE PRESSURE LIMIT CONTROLS .........................................................................................157
LEAVING CHILLED LIQUID CONTROL ...................................................................................................157
LEAVING CHILLED LIQUID SYSTEM LEAD/LAG AND COMPRESSOR SEQUENCING .....................158
LEAVING CHILLED LIQUID CONTROLOVERRIDE TO REDUCE CYCLING .........................................158
RETURN CHILLED LIQUID CONTROL ....................................................................................................159
RETURN CHILLLED LIQUID SYSTEM LEAD/LAG AND COMPRESSOR SEQUENCING ....................160
ANTI-RECYCLE TIMER ............................................................................................................................161
ANTI-COINCIDENCE TIMER ....................................................................................................................161
EVAPORATOR PUMP CONTROL & YORK HYDRO KIT PUMP CONTROL ..........................................161
EVAPORATOR HEATER CONTROL ........................................................................................................161
PUMPDOWN CONTROL...........................................................................................................................161
STANDARD CONDENSER FAN CONTROL ............................................................................................161
YCAL0019 - 0028 LOW AMBIENT FAN CONTROL OPTION ..................................................................165
General ......................................................................................................................................................165
Potentiometer Confi guration ............................................................................................................165
Wiring .................................................................................................................................................166
Programming .....................................................................................................................................167
YCAL0033 LOW AMBIENT FAN CONTROL OPTION .............................................................................168
General ...............................................................................................................................................168
Confi guration (Jumpers and Potentiometers) ................................................................................169
Wiring .................................................................................................................................................169
Programming .....................................................................................................................................169
YCAL0043 - 0066 LOW AMBIENT FAN CONTROL OPTION ..................................................................171
General ...............................................................................................................................................171
Confi guration (Jumpers and Potentiometers) ................................................................................172
Wiring .................................................................................................................................................173
Programming ....................................................................................................................................173
LOAD LIMITING ........................................................................................................................................175
COMPRESSOR RUN STATUS .................................................................................................................175
ALARM STATUS .......................................................................................................................................175
BAS/EMS TEMPERATURE RESET USINGA VOLTAGE OR CURRENT SIGNAL .................................176
SECTION 9 – SERVICE AND TROUBLESHOOTING .....................................................................................177
CLEARING HISTORY BUFFERS..............................................................................................................177
SERVICE MODE........................................................................................................................................177
SERVICE MODE – OUTPUTS ..................................................................................................................177
SERVICE MODE – CHILLER CONFIGURATION .....................................................................................178
SERVICE MODE – ANALOG & DIGITAL INPUTS ...................................................................................178
CONTROL INPUTS/OUTPUTS .................................................................................................................179
MICROBOARD LAYOUT ..........................................................................................................................180
TABLE OF CONTENTS (CONT’D)
Summary of Contents for YCAL0019
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