Unit Control Board: Opto-Isolator/Triac Legends; Alarm Input Opto-Isolator Legend: - Emerson Liebert iCOM Training And Service Manual

Microprocessor Control Board: Typical Location othe
Opto-Isolators and Triacs
Input Opto-Islators

Alarm Input Opto-Isolator Legend:

Opto
U15 Air Safety Switch
U16 Custom Alarm 1
U17 Custom Alarm 2
U18 Custom Alarm 3
U19 Custom Alarm 4
U20 Humidifier Problem
U21 Filter Clog switch
U22 Main Fan Overload
Note: Use Pin 5 on the input opto-isolator with reference to the V- terminal
for voltage check. The voltage level is 3.3 VDC.
iCOM
Microprocessor Control Board
Purpose
153
Control Training and Service Manual
Output Opto-Isolators and Triacs
Opto Purpose
U23 Power On
U24 Compressor 2 Overload
U25 Low Pressure Switch 2
U26 High Head Pressure 2
U27 Compressor 1 Overload
U28 Low Pressure Switch 1
U29 High Head Pressure 1