JOHNSON CONTROLS
FORM 160.75-EG1 (519)
104
The panel shall display countdown timer messages so the operator knows when functions
are starting and stopping. Every programmable point shall have a pop-up screen with
the allowable ranges, so that the chiller cannot be programmed to operate outside of its
design limits.
The chiller control panel shall also provide:
A. System operating information including:
1. Return and leaving chilled water temperature
2. Return and leaving condenser water temperature
3. Evaporator and condenser saturation temperature
4. Differential oil pressure
5. Percent motor current
6. Compressor discharge temperature
7. Oil reservoir temperature
8. Compressor thrust bearing positioning and oil temperature
9. Operating hours
10. Number of unit starts
B. Digital programming of setpoints through the universal keypad including:
1. Leaving chilled water temperature
2. Percent current limit
3. Pull-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 eld shall be 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.
Guide Specifications (Cont'd)
To Next Page
Loading...
