Lennox LI018CI-180P432 Service Manual page 48

Service Manual
●Outdoor unit:
Key detection point
"Test point NO."
Test 1 Between A and C
Test 2 Between B and C
Test 3 Between D and E
Test 4 Between F and G
Test 5 Both ends of diode D59
Both ends of electrolytic
Test 6
capacitor C47
Both ends of electrolytic
Test 7
capacitor C60
Both ends of electrolytic
Test 8
capacitor C73
Test 9 Between S and T
Test 10 Between point N and GND
Test 11 U7
Test 12 Between point M and GND
Test 13 U8
Installation and Maintenance
Test point
Neutral wire ,live wire
Neutral wire ,live wire
Electrolytic capacitor of DC bas bar
Electrolytic capacitor of switch power
D59(IPM module +15V)
C47(+12V power)
C60(+5V power)
C73(+3.3V power)
Communication circular current
C50 to N terminal (ground) (signal receiving terminal of
outdoor unit)
Between 1 and 2 at leading foot of U7
R77 to N terminal (ground) (signal receiving terminal of
outdoor unit)
Between 3 and 4 at leading foot of U8
Related elements Test value under normal condition
160V-265V
160V-265V
DC 180V-380V
DC 180V-380V
DC 14.5V-15.5
DC 12V-13V
DC 5V
DC 3.3V
DC 56V
Jumping between 0V and 3.3V
Jumping between 0V and 3.3V
Jumping between 0V and 3.3V
Jumping between 0V and 3.3V
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