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Control Training and Service Manual
121
Microprocessor Control Board: Typical Location othe
Opto-Isolators and Triacs
Input Opto-Islators Output Opto-Isolators and Triacs
Microprocessor Control Board
Alarm Input Opto-Isolator Legend:
Opto Purpose Opto Purpose
U15 Air Safety Switch U23 Power On
U16 Custom Alarm 1 U24 Compressor 2 Overload
U17 Custom Alarm 2 U25 Low Pressure Switch 2
U18 High Water Alarm U26 High Head Pressure 2
U19 Custom Alarm 3 U27 Compressor 1 Overload
U20 Humidifier Problem U28 Low Pressure Switch 1
U21 Filter Clog switch U29 High Head Pressure 1
U22 Main Fan Overload