MXZ-SM36NAMHZ Service Manual

121
OCH789
SW2
Pump down
SW6
Function selection
SW5
Function selection
SW9
Function selection
21S4
4-way valve
SV1
Bypass valve
SS
Base heater
CNAC
Power supply for multi
controller circuit board
(CNAC2)
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 (CN2)
(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 (CN2)
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: 15 V DC
6–5: 15 V DC
7–5: 15 V DC
CNDC
290V–380 V DC
(1(+)–3(−))
Connect to the out-
door
power circuit board
(CNDC)
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–380 V DC
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–380 V DC
(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
Linear expansion valve
SW1
Display selection
(Self diagnosis)
SWU2, SWU1
Address setting
SW8
Model selection
CN3N
Auto change over
63LS
Low pressure sensor
CNLVB
Linear expansion valve
TH2 Thermistor
<Hic pipe>
SV2
Switching valve
(Only NAHZ2 model)
CN4
Connect to the outdoor
power circuit board (CN4)
8-9. TEST POINT DIAGRAM
Outdoor multi controller circuit board
<CAUTION> TEST POINT 1 is high voltage.