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Microcomputer Control Center
All controls are contained in a NEMA 3R cabinet with
hinged and gasketed outer door and includes:
Liquid Crystal Display with Light Emitting Diode backlight-
ing for outdoor viewing:
•
Two display lines
•
Twenty characters per line
Color coded 12-button non-tactile keypad with sections
for:
DISPLAY/PRINT of typical information:
•
Suction temperatures (optional)
•
Ambient temperature
•
System pressures (each circuit)
•
Operating hours and starts (each compressor)
•
Print calls up to the liquid crystal display:
•
Operating data for the systems
•
History of fault shutdown data for up to the last
six fault shutdown conditions
FIG.1 – CONTROL PANEL COMPONENTS
JOHNSON CONTROLS
•
An RS-232 port, in conjunction with this press-to-print
button, is provided to permit the capability of hard
copy print-outs via a separate printer (by others).
ENTRY section to:
•
ENTER setpoints or modify system values SET-
POINTS updating can be performed to:
•
Suction pressure setting
•
Suction pressure control zone
•
Remote reset temperature range
•
Set daily schedule/holiday for start/stop
•
Manual override for servicing
•
Low and high ambient cutouts
•
Number of compressors
•
Low suction pressure cutout
•
High discharge pressure cutout
•
Anti-recycle timer (compressor start cycle time)
•
Anti-coincident timer (delay compressor starts)
UNIT section to:
•
Set clock
•
Set options
•
Set unit option
Set unit control for Discharge Air Temperature Control or
for Suction Pressure Control (requires Suction Pres sure
Transducers – standard.
UNIT ON/OFF switch
The microprocessor control center is capable of display-
ing the following:
•
Suction temperatures (optional)
•
Low ambient temperature cutout setting
•
Outdoor air temperature
•
English or Metric data
•
Suction pressure cutout setting
•
Each system suction pressure
•
System discharge pressure
FORM 150.63-EG4 (1012)
5
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