Mitsubishi Electric Mr. Slim PUHZ-SHW230YKA Service Manual page 31

8-7. TEST POINT DIAGRAM
Outdoor controller circuit board
PUHZ-SHW230YKA
SW7
Demand control setting
SW6
Model select
SW4
Test operation
SWP
Pump down
SW5
Function switch
Model select
SW8
Pipe replace
Wiring replace
CNM
Connect to A control
service tool
LEV-A,B,C
Linear expansion
valve
63HS
Pressure sensor
63L
Low pressure switch
TH4
Thermistor
<Discharge>
TH3
Thermistor
<Liquid pipe>
TH7/6
Thermistor
<Ambient,
2-phase pipe>
TH32
Thermistor
<Suction pipe>
V
FG
(Voltage between
right pins of PC5C
and PC5D, pin 3
and pin 4)
(Same as
7 4
(CNF1 (+)- (-))
V
SP
(Voltage between pins
of C5A, C5B):
DC 0V(when stopped),
CNF1, CNF2
Connect to the fan motor
DC 1– 6.5V
1-4: 250-330V DC
(when operated)
5-4: 15V DC
6-4: 0-6.5V DC
7-4: 15V DC(When stopped)
7.5V DC(When operated)
(0V-15V pulse)
OCH534
SW1
SW9
Forced defrost, detect history record reset,
Function switch
refrigerant address
CNDC
280V DC (1+, 3-)
(Noise filter circuit board)
31
CN51
External signal output
• Compressor
operating signal
• Abnormal signal
CNDM
1 to 2:
Input of low-level
sound priority mode
1 to 3:
Input of external
contact point
CN4
Transmission to
outdoor power circuit
board (CN4)
SV1
Option
(Drain hose heater output)
21S4
4-way valve
CN2
Connect to the outdoor
power circuit board (CN2)
1-5: Reception from
power circuit board
2-5: Zero cross signal
(0-5V DC)
3-4: Not used
6-5: 16V DC
7-5: 16V DC
CNAC
2 to 4:
Power supply for outdoor
controller circuit board
(230V AC)
1 to 3:
Power supply for
indoor and outdoor unit
connection wire
(230V AC)
63H
High pressure
switch
CNS
S1-S2: 230V AC