Mitsubishi MXZ-4C36NAHZ - Page 121

<CAUTION> TEST POINT 1 is high voltage.
121
8-8. TEST POINT DIAGRAM
Outdoor multi controller circuit board
MXZ-4C36NAHZ MXZ-5C42NAHZ MXZ-8C48NAHZ MXZ-8C48NA
MXZ-4C36NAHZ-U1 MXZ-5C42NAHZ-U1 MXZ-8C48NAHZ-U1 MXZ-8C48NA-U1
MXZ-8C60NA-U1
SW2
Pump down
SW6
Function selection
SW5
Function selection
SW9
Function selection
21S4
4-way valve
SV1
Bypass valve
CNAC
Power supply for multi
controller circuit board
208/230 V AC
CNS1
Branch box/ outdoor unit
connecting wire
CNS2
Transmission wire of
centralized control
CN40,CN41
Centralized control power
supply/ For storing
jumper connector selection
CN102
Connect to the M-P.B
(M-NET power circuit board)
CN51
External signal
output
SW4
Model selection
SW7
Manual defrost
SW3
Test run
CN2
Connect to the outdoor
power circuit board
1–5:
Power circuit board →
Transmitting signal to
the multi controller board
(0–5 V DC)
2–5: Zero cross signal
(0–5 V DC)
3–4: Not used
6–5: 16 V DC
7–5: 16 V DC
CNDC
290V–350 V DC (V)
(1(+)–3(−))
VCC (TEST POINT2)
(Voltage between pins of
C82A) : 15 V DC
(Same as CNF1,2 5(+)–4(−))
VSP
(Voltage between pins of
C515 and C516) :
0 V DC (when stopped)
1–6.5 V DC (when operated)
(Same as CNF1,2 6(+)–4(−))
CNF1, 2
Connect to fan motors
1–4 : 290V–350 V DC (V)
5–4 : 15 V DC
6–4 : 0–6.5 V DC
7–4 : 15 V DC(when stopped)
0–15 V DC pulse
(when operated)
VDC (TEST POINT1)
(Voltage between pins of C510)
: 290V–350 V DC (V)
(Same as CNF1,2 1(+)–4(−))
VFG (TEST POINT4)
(Voltage between pin3 and
pin4 of PC511 or PC512) :
(Correspond to CNF1,2 7(+)–4(−))
TH4 Thermistor
<Compressor>
TH7/TH6 Thermistor
<Ambient/ Suction pipe>
63HS
High pressure sensor
63H
High pressure switch
TH3 Thermistor
<Outdoor liquid pipe>
CN3D
Input of silent demand control
CNLVA
Electronic expansion valve
SW1
Display selection
(Self diagnosis)
SWU2, SWU1
Address setting
SW8
Model selection
CN3N
Auto change over
63LS
Low pressure sensor
CNLVB
Electronic expansion valve
TH2 Thermistor
<Hic pipe>
SV2
CN52
52C relay drive signal
1(+)–2(−): 13 V DC
(When 52C relay is ON)
1(+)–3(−): 13 V DC
(When 52C relay is ON)
OCH573C