Mitsubishi Electric EHST20C-VM6HB Service Manual page 48

11-6. TEST POINT DIAGRAM
Outdoor controller circuit board
PUHZ-SW75VHA(-BS).UK
PUHZ-SW100VHAR3(-BS).UK PUHZ-SW120VHA(-BS).UK
PUHZ-SW100YHA(-BS).UK
PUHZ-SW100YHAR3(-BS).UK PUHZ-SW120YHAR1(-BS).UK
CNS
(Indoor/outdoor unit
connecting wire)
63H
High pressure switch
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)
CN2
Connect to the outdoor
power circuit board (CN2)
1–5: Power circuit board
→ Transmitting signal to
the controller circuit board
(0–5 V DC)
2–5: Zero cross signal
(0-5V DC)
3–4: Not used
(SW75V,100/120Y)
18 V DC (SW100/120V)
6–5: 16 V DC
7–5: 16 V DC
[5: – 1,2,6,7: + ]
21S4
4-way valve
CN4
Transmission to out-
door power circuit
board (CN4)
CN52C
(Connect to the outdoor noise
filter circuit board (SW75V)/
the outdoor power circuit
board (SW100/120V))
Only for SW·VHA
OCH533D
PUHZ-SW75VHAR3(-BS).UK
PUHZ-SW120YHA(-BS).UK
V (TEST POINT 2)
CC
(voltage between pins of
C6B): 15 V DC
CN51
External signal output
• Compressor operating signal
• Abnormal signal
PUHZ-SW100VHA(-BS).UK
PUHZ-SW120VHAR3(-BS).UK
PUHZ-SW100YHAR1(-BS).UK
PUHZ-SW120YHAR3(-BS).UK
CNDC
280–380 V DC Connect
from outdoor power circuit
board for VHA, connect
from noise filter board for
(CNDC)
YHA
+ –
SWP
SW9
Function switch Pump down
CNDM
1–2: Input of low-level sound priority mode
1–3: Input of external contact point
48
V (TEST POINT 1)
DC
(voltage between pins of C5E)
: 250–380 V DC
V (TEST POINT 3)
SP
(voltage between pins of
C5A, C5B): 0 V DC (when
stopped), 1–6.5 V DC
(when operated)
V (TEST POINT 4)
FG
(voltage between right
pins of PC5C and PC5D,
pin 3 and pin 4)
TH6
Thermistor
<2-phase pipe>
TH7
Thermistor<Ambient>
TH3
Thermistor
<Liquid>
TH4
Thermistor <Discharge>
63HS
High pressure sensor
TH34
Thermistor
<Comp. surface>
LEV-A,-B
Linear expansion valve
63L
Low pressure switch
(SW100/120)
SW4
Test operation
SW5
Function switch,
Model select
SW6
Model select
SW1
Manual defrost, detect
history record reset,
refrigerant address
SW7
Demand control setting