Haier AU96NFTAHA Service Manual page 105

Block diagram of indoor unit control
(MCC-1256 MCC-1234-01: relay speed regulating)
12V AC
Transformer
5A
L
Power
supply
N
Float
switch
Louver
Drain
pump
AC contactor
Capacitor
Fan
motor
Remote
controller
(Master)
A B C D A
CN12
Indoor controller
Serial com-
munication
Power
supply
loop
5V
Zero cross
detection
choice of
airflow
Optical
coupler
Relay
driver
102
Remote
Timer
controller
(Slave)
B C D
A B D
BUS comm-
unication circuit
BUS comm-
unication circuit
Multiplex
convertor
MCU
TB4051BP
TMP87PM40AN
Switch for
function, type
PMV
driving loop
E
Switch for
function, type
LED displaying
abnormal indoor
and outdoor
communication
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Central
controller
X Y
Central
manageme
nt system
X
Y
Cool control
P
system
Q
TA
TC1A
TC1B
TC2
Pressure
sersor
PMV
PROM
2
Selectable function
CN06
HA
CN13
Compressor
Running
Abnormal
Heating
Humidifying
CN17
Interlocking
CN19
temperature
sensor OFF