York YK, Manual

Page: 13 / 114

FORM 160.75-EG1 (519)
JOHNSON CONTROLS 13
B. Digital programming of setpoints through the universal keypad including:
1. Leaving chilled water temperature
2. Percent current limit
3. Pulls-down demand limiting
4. Six-week schedule for starting and stopping the chiller, pumps and tower
5. Remote reset temperature range
C. Status messages indicating:
1. System ready to start
2. System running
3. System coastdown
4. System safety shutdown – manual restart
5. System cycling shutdown – auto restart
6. System pre-lube
7. Start inhibit
D. The text displayed within the system status and system details field is displayed as a
color-coded message to indicate severity: red for safety fault, orange for cycling faults,
yellow for warnings, and green for normal messages.
E. Safety shutdowns enunciated through the display and the status bar, and consist of
system status, system details, day, time, cause of shutdown, and type of restart re-
quired. Safety shutdowns with a fixed-speed- drive include:
1. Evaporator – low pressure
2. Evaporator – transducer or leaving liquid probe
3. Evaporator – transducer or temperature sensor
4. Condenser – high pressure contacts open
5. Condenser – high pressure
6. Condenser – pressure transducer out-of-range
7. Auxiliary safety – contacts closed
8. Discharge – high temperature
9. Discharge – low temperature
10. Oil – high temperature
11. Oil – low differential pressure
12. Oil – high differential pressure
Equipment Overview (Cont'd)