JOHNSON CONTROLS
FORM 150.26-EG1 (116)
8
MICROPROCESSOR CONTROLS
The control section shall contain:
• On/Off rocker switch
• Microcomputer keypad and display
• Microprocessor board
• I/O expansion board
• Relay boards
• 24V fused power-supply board
The control display shall include:
• Liquid Crystal Display with Light Emitting Diode backlighting for outdoor viewing
• Two display lines
• Twenty characters per line
Color coded 12-button non-tactile keypad with sections for display/print of typical informa-
tion:
• Chilled liquid temperatures
• 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
• 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
Setpoints updating can be performed to:
• Chilled liquid temperature setpoint and range
• Remote reset temperature range
• Set daily schedule/holiday for start/stop
• Manual override for servicing
• Number of compressors
Microprocessor Controls
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