Test Point Diagram; Outdoor Controller Circuit Board - Mitsubishi Electric MXZ-8A140VA Technical & Service Manual

9-7. TEST POINT DIAGRAM

9-7-1. Outdoor controller circuit board

MXZ-8A140VA MXZ-8A140VA
CNS
(Branch box/outdoor unit connecting wire)
Communication
power supply
ZD71 Voltage
developed across:
16-30V DC
+
–
CNAC
2 to 4: Power supply for
outdoor controller
circuit board
(220V-240V AC)
1 to 3: Power supply for
indoor and branch box /
outdoor unit connection
wire (220V-240V AC)
CN2
Connect to the outdoor
power circuit board (CN2)
1-5:
Power circuit board
Transmitting signal to
the controller circuit board
(0-5V DC)
2-5: Zero cross signal
(0-5V DC)
3-4: Not used
6-5: 18V DC
7-5: 18V DC
[5: – 1,2,6,7: + ]
52C
Contactor
21S4
Four-way valve
SV2
Solenoid valve2
SV1
Solenoid valve1
CN4
Transmission
to outdoor
power circuit
board (CN4)
LED3
CN51
<CAUTION> TEST POINT1 is high voltage.
MXZ-8A140VA
1 2
CNDM
1 to 2: Input of low noise mode
1 to 3: Input of external
contact point
(TEST POINT 2)
V
CC
(voltage between pins of C6B): DC 15V
63H
High pressure switch
SW2
SW9
SW10
CN3S
60
(TEST POINT 1)
V
DC
(voltage between pins of
C5E): DC280V-350V
CNDC
DC280V-350V
+
}
Connect from
outdoor power
–
circuit board
(CNDC)
(TEST POINT 3)
V
SP
(voltage between pins of
C5A, C5B): DC 0V (when
stopped), DC 1– 6.5V
(when operated)
(TEST POINT 4)
V
FB
(voltage between right
pins of PC5C and
PC5D, pin 3 and pin 4)
TH6
Thermistor
<Outdoor 2-phase pipe>
TH7
Thermistor<Outdoor>
TH3
Thermistor
<Outdoor pipe>
TH4
Thermistor
<Discharge>
63HS
High pressure
sensor
63L
Low pressure switch
SW5
Function switch
SW6
Model setup
SW1
Forced defrost,
detect history
record reset
SW7
SW4
Test operation