Mitsubishi Electric PUHZ-SW50VHA Service Manual page 41

10-9. TEST POINT DIAGRAM
Outdoor controller circuit board
PUHZ-SW40VHA
PUHZ-SW40VHA-BS
SW1
Manual defrost, SW7
detect history record
Demand control setting
reset, refrigerant
address
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
Linear expansion
valve
TH34
Thermistor
<Comp. surface>
63HS
High pressure
sensor
TH4
Thermistor
<Discharge>
TH3
Thermistor
<Liquid>
TH7/6
Thermistor
<Ambient/
2-phase pipe>
63H
High pressure
switch
V
FG
(Voltage between
right pins of PC5C
and PC5D, pin 3
and pin 4)
(Same as
(CNF1 (+)- (−))
7 4
V
SP
(Voltage between pins of
C5A, C5B): 0 V DC (when
stopped), 1–6.5 V DC
(when operated)
CNF1
Connect to the fan motor
1–4: 250–330 V DC
5–4: 15 V DC
6–4: 0–6.5 V DC
7–4: 15 V DC (When stopped)
7.5 V DC (When operated)
(0–15V pulse)
OCH525C
PUHZ-SW40VHAR1
PUHZ-SW40VHAR1-BS PUHZ-SW50VHA-BS
CNDM
1–2: Input of low-level sound priority mode
1–3: Input of external contact point
CNDC
250–330 V DC
(1+, 3−)
(Outdoor power circuit
board)
<CAUTION> TEST POINT1 is high voltage.
PUHZ-SW50VHA
41
PUHZ-SW50VHAR1
PUHZ-SW50VHAR1-BS
CN51
External signal output
• Compressor operating signal
• Abnormal signal
CN4
Transmission to out-
door power circuit
board (CN4)
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
(0–5 V DC)
3,4: Not used
6–5: 16 V DC
7–5: 16 V DC
CNAC
2–4: Power supply for
outdoor controller circuit
board (230 V AC)
1–3: Power supply for
indoor and outdoor unit
connection wire
(230 V AC)
CNS
S1–S2: 230 V AC