S W U 1 ~ 2
T B 1
Switch unit address set
Terminal block power source
T B 3
T B 7
Terminal block transmisson
GR Ground terminal
Terminal block transmisson
centralized control
L D 1
S W 1
S W 2 ~4 Switch function selection
Switch display selection self-diagnosis
Luminous diode
T H 8 bypass outlet temp.
detect at Sub-cool coil
T H H S Rediator panel temp.detect
6 3 H S High pressure sensor
S L E V
L E V 1
Electronic expansion valve
(Oil return)
Electronic expansion valve
(Sub-cool coil bypass)
L 2 Choke coil(Transmission)
T H 7 liquid outlet temp.
detect at Sub-cool coil
T H 5
T H 2
T H 1
pipe temp.detect
T H 6 OA temp.detect
saturation
evapo.temp.detect
Thermistor
Thermistor
6 3 H High pressure switch
S V 1 , S V 2 Solenoid valve
(Discharge-suction bypass)
C H 1 Crankcase heater (Compressor)
D S A Surge absorber
Motor Compressor
Motor Fan Heat exchanger
Motor Fan Radiator panel
M F 1
M F
M C
5 2 C Magnetic contactor
(Inverter main circuit)
Z N R 1 ~ 4 Varistor
C 1 Capacitor Smoothing
Resistor rush current protect
D C C T Current Sensor
R 1
R 2 Resistor power regulation
D C L DC reactor
(Power factor improvement)
I P M Intelligent Power Module
D S Diode stack
Symbol Name Symbol Name Symbol Name Symbol Name
discharge pipe temp.detect
4-way valve
2 1 S 4
OFF : 0
ON : 1
(at factory shipment)

FLAG7

FLAG1 FLAG6

Display

Relay output
display
(Lighting)
During
compressor
run
Crankcase
heater

0000~9999

Display the address and error codes by turns

21S4 SV1 SV2

Check display
(Blinking)

Display at LED lighting (blinking) Remarks SW1 operation

FLAG3 FLAG4FLAG2 FLAG5 FLAG8

FLAG8 always lights at

microcomputer power ON

Always
lighting
<Operation of self-diagnosis switch (SW1) and LED display> <LED display>

LD1

FLAG8

FLAG7

FLAG6

FLAG5

FLAG4

FLAG3

FLAG2

FLAG1

1 2 3 4 5 6 7 8 9 10
-
8
-