Mitsubishi Electric SUZ-KA18NA2 Service Manual page 30

10-6. TEST POINT DIAGRAM AND VOLTAGE
Inverter P.C. board
SUZ-KA18NA(H)2.TH
Back side of unit
208/230 V AC
Fuse (F62)
15 A 250 V
Output to
drive
compressor
(LDU,
LDV,
LDW)
Output to
drive outdoor
fan motor
(CN932)
Fin temperature
thermistor/RT64
(CN642)
Ambient temperature
thermistor/RT65
(CN643)
Front side of unit
Defrost thermistor(RT61)
Ambient temperature thermistor(RT65)
Outdoor heat exchanger temperature thermistor(RT68)
100
90
80
70
60
50
40
30
20
10
0
-4 14 32 50 68
Temperature(°F)
OCH688D
Smoothing
DB61
capacitor
260 - 370 V DC
(C63)
(-) (+)
Fuse (F901)
T3.15AL250V
Signal of outdoor
fan motor (CN931)
Defrost thermistor
/RT61(CN641)
Discharge temperature
thermistor/RT62
(CN641)
Discharge temperature thermistor (RT62)
800
700
600
500
400
300
200
100
0
32 50 68 86 104 122 140 158 176 194 212 230 248
86 104
Temperature (°F)
Smoothing
Smoothing
capacitor
capacitor (C61)
(C62)
Fuse (F801)
T3.15AL250V
LEV (CN724)
LED
Outdoor heat exchanger
temperature thermistor
/RT68 (CN644)
Fin temperature thermistor(RT64)
200
180
160
140
120
100
80
60
40
20
0
32 50 68 86 104 122 140 158 176
30
R.V.coil
(CN721)
Defrost heater
208/230 V AC
(CN722)
Fuse (F701)
T3.15AL250V
Fuse (F61)
25 A 250V
Jumper wire Jumper wire for
for pre-heat changing defrost
control setting setting (JS)
(JK)
Temperature(°F)
208/230
V AC