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8.4.2 Outdoor Unit:
8.4.2.1 Key detection points
Test2
Test4
Test1
Test3
Test5
Test6
Test7
Test8
Test9
Test point SN
Test point
Related specification
Test value in normal condition
Test 1
Between AC-L1 and N1
Neutral and live wire
165V ~ 253V
Test 2
Left side of R201, radiator U404
DC bus bar
230V ~ 380V
Test 3
Top of D304, Bottom of D304
IPM drive v 15V
13,5V ~ 15,5V
Test 4
Top of C116, bottom of C116
Relay drive v12V
11V ~ 13V
Test 5
Right side of R228, left side of D228
PFC drive v15V
13,5V ~ 15,5V
Test 6
Left and top ends of U4, bottom of U4
Chip +3,3V
3,1V ~ 3,3V
Test 7
Right and top end of U4, bottom of U4
+5V
4,8V ~ 5,1V
Test 8
Bottom of R506, bottom of U4
Outdoor unit receiving signal
Fluctuate between 0 and 3,3V
Test 9
Bottom of R523, bottom of U4
Outdoor unit sending signal
Fluctuate between 0 and 3,3V
Summary of Contents for BDS28A
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