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Controls Training and Service Manual
Note: Use Pin 5 on the input opto-isolator with reference to the V- terminal
for voltage check. The voltage level is 5 VDC.
Control Output Opto-Isolator Legend:
Opto Purpose Opto Purpose
U1 Reheat 1 U10 Compressor 2
U2 Reheat 2 U11 Econ-O-Cycle Relay (R5)
U3 Reheat 3 U12 Liquid Line Solenoid 1
U4 Humidifier U13 Hot Gas Bypass 2
U5 Main Fan U14 Compressor 1
U8 Liquid Line Solenoid 2 U17 CW Actuator
U9 Hot Gas Bypass 2 U18 CW Actuator Close
Note: Use Pin 4 on the output opto-isolator with reference to the correct
transformer neutral/ ground. The voltage level is 24 VAC.
Control Output Triac Legend:
Opto Purpose Opto Purpose
Q1 Reheat 1 Q10 Compressor 2
Q2 Reheat 2 Q11 Econ-O-Cycle Relay (R5)
Q3 Reheat 3 Q12 Liquid Line Solenoid 1
Q4 Humidifier Q13 Hot Gas Bypass 2
Q5 Main Fan Q14 Compressor 1
Q8 Liquid Line Solenoid 2 Q17 CW Actuator
Q9 Hot Gas Bypass 2 Q18 CW Actuator Close
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