152
11. Service and Maintenance
AEYC-1639U-CH
BL
GR
OR
Y
COLOR OF WIRE
: BLACK
: WHITE
: RED
: GREEN
: BROWN
B
W
R
G
BR
: BLUE
: GRAY
: ORANGE
: YELLOW
Don't touch electrically charged parts, as electric
shock may occur even if they are switched off.
Be sure to wait at least 5 mitutes after turning off the
power and to confirm the voltage between and
is less than DC10V with a tester before servicing.
Warning when you fix electric components !
How to release
locking terminals ( )
Electric Shock !
WARNING !
Lever
To release the terminals ( ),
press the locking lever
and pull.
Do not touch any part of the electric circuit (including the wiring of
thermistor and others), as it has high voltage against the ground.
Pay attention not to damage the insulated wire when you tighten the
screw, as the exposed wire may cause electric shock or malfunction.
Do not ground the oscilloscope when you operate. You might destroy
it. Also do not touch any metal part of the oscilloscope while operating.
PCB
(MAIN)
H.P.SW.
EXP.V.
4 WAY V.
DEFROST HEATER
SENSOR
(TEMP.,SUCTION)
SENSOR
(TEMP.,DISCHARGE)
28
25
21
23
19
13
14
8
11
6
4
22
29
8
9
MOTOR
(FAN)
MOTOR
(FAN)
upper
lower
SENSOR
(TEMP.,DEFROST)
ON
OFF
PUMP
U
V
W
W
V
U
R
W
B
OR
Y
Y
OR
COMPRESSOR
OHR
TERMINAL BLOCK
REACTOR
REACTOR
FUSE CF2
(250V T5A)
GR
GR
B
BL
3
2
1
FUSE CF6
(250V T3.15A)
FUSE CF7
(250V T3.15A)
B
B
B
B
BL
W
B
W
R
W
B
B
B
G/Y
B Y
BL
R
G/Y
W
N
L
POWER
1
2
3
PCB
(CONTROLLER)
PCB
(TERMINAL)
7
3
4
4
5
TRANSFORMER
2
1
Remote
Controller
1
2
3
4
5
6
7
17
18
19
20
21
22
23
Humidity
Sensor
COM
DHW Remote
Contact
ON/OFF
or
EHS Alarm
GND
24VAC
COM
Control
DHW
T.probe
OUTDOOR
T.probe
BUFFER
T.probe
Mix water
T.probe
3-way
mixing
valve
RS485
+
-
Dehumidifier
Alarm
Pump1
Pump2
Neutral
N.C.
Neutral
EHS
Heating
Cooling
mode
output
Phase
Signal
3-way
valve
8
9
10
11
12
13
14
Dual Set
Point
Control
Heating
Cooling
mode
Flow
switch
Night
mode
Low
tariff
RS485
GND
45
46
47
48
49
50
31
32
24
25
26
27
28
29
30
15
16
N
41
42
43
44
51
52
Electric
heater
RESET SW.
PUMP SW.
RAM CLEAR
EEPROM
DIP SW.
FUSE CF1
(250V T10A)
Caution Electric Shock
High Voltage
R
SENSOR
(TEMP., OUTDOOR)
SENSOR
(TEMP., OUTGOING)
SENSOR
(TEMP., RETURN)
R
B
W
W
B
Summary of Contents for AEYC-0639U-CH
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