Test Point Diagram; Outdoor Controller Circuit Board - Mitsubishi Electric SUZ-KA24NAHZ Service Manual

10-8. TEST POINT DIAGRAM

Outdoor controller circuit board

SW7 SW1
Demand control setting Manual defrost, detect
Model select history record reset,
refrigerant address
SW4
Test operation
SW6
Model select
SWP
Pump down
SW5
Function switch
Model select
CNM
Connect to A control
service tool
LEV-A,B,C
Linear expansion
valve
(LEV-C:KA30/36 only)
TH4
Thermistor
<Discharge>
TH3
Thermistor
<Liquid>
TH7/6
Thermistor
<Outdoor/Outdoor
2-phase pipe>
TH32
Thermistor
<Suction>
TH33
Thermistor
<Comp. surface>
V
FG
(Voltage between
right pins of PC5D,
pin 3 and pin 4)
(Same as
(CNF1 (+)– (−))
7 4
CNF1, CNF2 (CNF2: KA30/36 only)
Connect to the fan motor
1-4: 250–380 VDC
5-4: 15 VDC
6-4: 0–6.5 VDC
7-4: 15 VDC (When stopped)
7.5 VDC (When operated,
0–15 V pulse)
OCH754A
CNDM
1 to 2: Input of low-level
CN3S
Water heater
1 to 3: Input of external
CNDC
+ –
250–380 VDC
−
(1+, 3 )
Outdoor power
circuit board
57
<CAUTION> TEST POINT1 is high voltage.
sound priority
mode
contact point
(+: D72 Cathode, –: CNS-A 2pin)
Communication power supply
DC Voltage
24 VDC
CN51
Water heater Comp protect
21S4
4-way valve
SV3
Solenoid valve
CN4
Transmission to out-
door power circuit
board (CN4)
CN2
Connect to the outdoor
power circuit board (CN2)
1–5: Reception from
power circuit board
2–5: Zero cross signal
(0–5 VDC)
3,4: Not used
6–5: 15 VDC
7–5: 15 VDC
CNAC
2 to 4: Power supply for
outdoor controller circuit
board (208/230 VAC)
1 to 3: Power supply for
indoor and outdoor unit
connection wire
(208/230 VAC)
CNS
S1-S2: 208/230 VAC