Mitsubishi Electric PUMY-P36NKMU4 Technical & Service Manual page 120

8-9. TEST POINT DIAGRAM
Outdoor multi controller circuit board
SW2
SW8
Model selection Pump down
SW6
Function selection
SW5
Function selection
SW9
Function selection/
Model selection
SW1
Display selection
(Self diagnosis)
SWU2, SWU1
Address setting
CNLVB
Linear expansion valve
CNLVA
Linear expansion valve
CN3N
Auto change over
63H
High pressure switch
CN3D
Input of silent demand control
TH2 Thermistor
<Hic pipe>
TH4 Thermistor
<Compressor>
TH3 Thermistor
<Outdoor liquid pipe>
TH7/TH6 Thermistor
<Ambient/ Suction pipe>
63HS
High pressure sensor
63LS
Low pressure sensor
V (TEST POINT )
FG
(Voltage between pin3 and
pin4 of PC511 or PC512):
(Correspond to CNF1,2 (+)– (−))
V
SP
(Voltage between pins of
C515 and C516):
0 V DC (when stopped)
1–6.5 V DC (when operated)
(Same as CNF1,2 (+)– (−))
OCH811A
SW3 SW7
Test run Manual defrost
CNF1, 2
V
DC
Connect to fan motors
(Voltage between pins of C510)
– : 290V–380 V DC
– : 15 V DC
– : 0–6.5 V DC
– : 15 V DC(when stopped)
0–15 V DC pulse
(when operated)
<CAUTION> TEST POINT
SW4
Model selection
CNDC
(TEST POINT )
290V–380 V DC
( (+)– (−))
: 290V–380 V DC
Connect to the out-
(Same as CNF1,2
door
(+)– (−))
power circuit board
(CNDC)
120
1 is high voltage.
CN51
External signal
output
CN102
Connect to the M-P.B (CN2)
(M-NET power circuit board)
CN40,CN41
Centralized control power
supply/ For storing
jumper connector selection
CNS2
Transmission wire of
centralized control
CNS1
Branch box/ indoor unit /out-
door unit
connecting wire
CN4
Connect to the outdoor
power circuit board (CN4)
CN2
Connect to the outdoor
power circuit board (CN2)
– :
Power circuit board →
Transmitting signal to
the multi controller board
(0–5 V DC)
– : Zero cross signal
2
(0–5 V DC)
– : 15 V DC
– : 15 V DC
– : 15 V DC
CNAC
Power supply for multi
controller circuit board
(CNAC2)
208/230 V AC
SS/BH
Base heater
SV1
Bypass valve
SV2
Switching valve
(Only NAHZ2 model)
21S4
4-way valve
V (TEST POINT )
CC
(Voltage between pins of
C82A): 15 V DC
(Same as CNF1,2 (+)– (−))