Lennox LI024CO-230P432 - Page 57

54
Installation and Maintenance
Service Manual
●Outdoor unit:
Test1
Test2 Test3 Test4
Test5
E
G
I
H
F
D
B
A
C
L
Test9
Test6
K
J
Tset7
M
N
Test11
Test10
Test8
S
T
Test12
1.Key detection point
Test NO Test point Corresponding component
Test value under normal
condition
Test 1 Between A and C Neutral and live wires 160V~265V
Test 2 Between B and C Neutral and live wires 160V~265V
Test 3 Between D and E DC busbar electrolytic capacitor DC 180V~380V
Test 4 Between F and G Electrolytic capacitor of power DC 180V~380V
Test 5 Two ends of diode D15 D15(IPM modular +15V power supply) DC 14.5V~15.6V
Test 6
Two ends of electrolytic
capacitor C715
C715(+12V power supply) DC 12V~13V
Test 7
Two ends of electrolytic
capacitor C710
C710(+5V power supply) DC 5V
Test 8
Two ends of electrolytic
capacitor C226
C226(+3.3V power supply) DC 3.3V
Test 9
Two ends of chip capacitor
C912
C912(+17V power supply) DC 15V~18V
Test 10 Between M to GND Point M of R75 to ground (signal sending port of ODU) Fluctuate between 0~3.3V
Test 11 Between N to GND Point N of R123 to ground (signal receiving port of ODU) Fluctuate between 0~3.3V
Test 12 Between S and T Power supply of communication ring DC 56V