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12KHR-N

IVT 12KHR-N Service Manual

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Page 1
SERVICE MANUAL
12KHR-N
Parts marked with " " are important for maintaining the safety of the set. Be sure to replace these parts with specified ones for maintaining the safety and performance of the set.
This document has been published to be used for after sales service only. The contents are subject to change without notice.
[1] SPECIFICATION............................................ 1-1
[2] EXTERNAL DIMENSION............................... 1-2
[3] WIRING DIAGRAM........................................ 1-3
[4] ELECTRICAL PARTS .................................... 1-3
CHAPTER 2. EXPLAMATION OF CIRCUIT AND OP­ERATION
[1] BLOCK DIAGRAMS....................................... 2-1
[2] MICROCOMPUTER CONTROL SYSTEM........ 2-3
[3] FUNCTION .................................................... 2-9
CHAPTER 3. FUNCTION AND OPERATION OF PRO­TECTIVE PROCEDURES
[1] PROTECTION DEVICE FUNCTIONS AND
OPERATIONS................................................ 3-1
[2] AIR TO AIR HEAT PUMP OPERATION IN
THERMISTOR ERROR ................................. 3-3
[3] THERMISTOR TEMPERATURE CHAR-
ACTERISTICS ............................................... 3-5
[4] HOW TO OPERATE THE OUTDOOR
UNIT INDEPENDENTLY ............................... 3-6
[5] GENERAL TROUBLESHOOTING CHART........ 3-6
[6] MALFUNCTION (PARTS) CHECK METH-
OD ................................................................. 3-8
[7] OUTDOOR UNIT CHECK METHOD .......... 3-10
[8] TROUBLESHOOTING GUIDE .................... 3-14
CHAPTER 4. REFRIGERATION CYCLE
[1] FLOW FOW REFRIGERANT ........................ 4-1
[2] STANDARD CONDITION.............................. 4-1
[3] TEMPERATURE AT EACH PART AND
PRESSURE IN 3-WAY VALVE...................... 4-1
[4] PERFORMANCE CURVES........................... 4-2
CHAPTER 5. DISASSEMBLING PROCEDURE
[1] DISASSEMBLY OF INDOOR UNIT............... 5-1
[2] DISASSEMBLY OF OUTDOOR UNIT.........5-10
Parts Guide
TopPage
CONTENTS
SPLIT TYPE
12KHR-N
MODEL
In the interests of user-safety (Required by safety regulations in some countries) the set should be restored to its original condition and only parts identical to those specified should be used.
AIR TO AIR HEAT PUMP
Page 2
12KHR-N
1 – 1
12KHR-N
5GTXKEG/CPWCN
CHAPTER 1. SPECIFICATION
[1] SPECIFICATION
1. 12KHR-N
NOTE: The conditions of star”✩” marked item are based on ‘EN14511’.
MODEL INDOOR UNIT OUTDOOR UNIT
ITEMS 12KHR-N
Rated cooling capacity (Min– Max.) kW 3.5 (0.9 - 4.0) Rated heating capacity (Min–Max.) kW 4.6 (0.9 - 6.5) Moisture removal (at cooling) Liters/h 1.2 Electrical data Phase Single Rated frequency Hz 50 Rated voltage V 220-240
Rated current ڏ
(Min - Max.)
Cool A 4.2 (0.9 - 5.7 ) Heat A 5.0( 0.9 - 7.4 )
Rated input ڏ
(Min - Max.)
Cool W 920 (200- 1250) Heat W 1075 (160 - 1700)
Power factor ڏ
Cool % 95
Heat % 92 Maximum operating current A 9.6 Compressor Type Hermetically sealed rotary type
Model DA111A1F22F
Oil charge 450cc (Ester oil VG74) Refrigerant system Evaporator Louver Fin and Grooved tube type
Condenser Corrugate Fin and Grooved tube type
Control Expansion valve
Refrigerant (R410A) 1180g
De-lce system Micro computer controled reversed systems Noise level (at cooling)
High dB(A) 40 47
Low dB(A) – –
Soft dB(A) 27 – Fan system Drive Direct drive Air flow quantity (at cooling)
High m3/min. 9.3 32.2
Low m3/min. 7.6 –
Soft m3/min. 5.2 – Fan Cross flow fan Propeller fan Connections Refrigerant coupling Flare type Refrigerant tube size Gas, Liquid 3/8", 1/4"
Drain piping mm O.D I16
Others Safety device Compressor: Thermal protector
Fan motors: Thermal fuse
Fuse, Micro computer control Air filters Polypropylene net (Washable) Net dimensions Width mm 790 780
Height mm 260 540 Depth mm 290 265
Net weight kg 11 36
Page 3
12KHR-N
1 – 2
[2] EXTERNAL DIMENSION
1. Indoor unit
2. Outdoor unit
㧔Unit㧦㨙㨙㧕
798
260
290
22.0
58
18.5
175
INVERTERAIRCONDITIONER
265
780
540
14
167.5
165
540
299
72
58
37.5
12
4.5
324
135
81
136
Page 4
12KHR-N
1 – 3
[3] WIRING DIAGRAM
1. Indoor unit
2. Outdoor unit
[4] ELECTRICAL PARTS
1. Indoor unit
2. Outdoor Unit
DESCRIPTION MODEL REMARKS
Indoor fan motor MLB395 DC motor Indoor fan motor capacitor – – Transformer – – FUSE1 – QFS-GA078JBZZ (250V, 3.15A)
DESCRIPTION MODEL REMARKS
Compressor DA111A1F22F DC motor Outdoor fan motor MLB078 DC motor Outdoor fan motor capacitor – – Fu4 – QFS-GA064JBZZ(250V, 1A) Fu3 – QFS-GA051JBZZ(250V, 2A) Fu2 – QFS-GA052JBZZ(250V, 3.15A) Fu1 – QFS-CA001JBZZ(250V, 20A) Fu5, 6 – QFS-CA002JBZZ(250V, 15A)
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Blinking NO.
#DPQTOCN%QPVGPVU
Shortcircuit of the outdoor thermistor Overheat of the compressor
EEPROM error of indoor unit
Abnormal
fa
n
m
otor of
in
door uni
t
Sho
rt circuit of serial si
g
nal line
Open circuit of serial signal line
Abnormal PAMvoltage and clock signal
Abnormal compressor rotation
Abnormal outdoor fan motor
Abnormal thermistor of four way valve
AbnormalAC current
DC over current
Open circuit of the outdoorthermistor
<Indication of the abnormal condition>
LED indicator will blink, if the set is in abnormal condition.
Thermal fuse error of outdoor unit
Abnormal wire connection
EEPROM error of outdoor unit
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Page 5
12KHR-N
2 – 1
12KHR-N
5GTXKEG/CPWCN
CHAPTER 2. EXPLAMATION OF CIRCUIT AND OPERATION
[1] BLOCK DIAGRAMS
1. Indoor unit
AC power
Rectification circuit
CPU
3.15A Fuse
DC power supply circuit
Fan motor PWM control circuit
Rotation pulse input circuit
AC clock circuit
Remote controller signal reception circuit
Buzzer drive circuit
CPU reset circuit
CPU oscillator circuit
Room temp. detect circuit
Heat exchanger pipe thermo circuit
EEPROM
Select circuit
Serial I/O circuit
Auto restart circuit
Test run circuit
Auxiliary mode
Power on circuit
Cluster generator drive circuit
Indoor fan motor
Fan motor pulse detect
Wireless remote control operation
Audible operation confirmation
Room temp. thermistor
Heat exchanger pipe thermistor
Louvre angle, fan speed
Wireless, preheat, Model select
Indoor/outdoor control signal I/O
Test run (forced operation)
Auxiliary mode button ON/OFF
Self diagnostics, fault diagnosis
Cluster generator
Unit-unit wiring (AC power and serial signals)
LED Drive circuit
LED display
Louver motor drive circuit (Horizontal)
Louver motor drive circuit (Vertical, right)
Louver motor drive circuit (Vertical, left)
How direction control (Horizontal louver motor)
How direction control (Vertical louver motor,right)
How direction control (Vertical louver motor,left)
Page 6
12KHR-N
2 – 2
2. Outdoor unit
CPU
20A
protection
15A
protection
Expansion valve drive circuit Expansion valve
Suction temp. thermo. circuit Suction pipe thermistor
2-way valve temp. thermo. circuit 2-way valve thermistor
3.15A
protection
15A
protection
Power supply circuit
CPU oscillator circuit
DC overvoltage detection circuit
Outdoor fan drive circuit
4-way valve relay drive circuit
Power transistor module drive circuit
Serial I/O circuit
CPU reset circuit
Position detection circuit
AC overcurrent detection circuit
Compressor thermo circuit
Heat exchanger pipe thermo circuit
Outdoor temp. thermo. circuit
LED drive circuit
Test mode circuit
Power factor converter circuit
Filter circuit
Smoothing circuit
Pulse amplitube modulation circuit
EEPROM
AC clock circuit
DC overcurrent detection circuit
IGBT
Unit-unit wiring (AC power and serial signals)
Outdoor fan
4-way valve
Power transistor module
Compressor
Current transformer
Compressor thermistor
Heat exchanger pipe thermistor
Outdoor temperature thermistor
LED
Terminal board, Terminal fuse, circuit
Terminal board, Terminal fuse
Page 7
12KHR-N
2 – 3
[2] MICROCOMPUTER CONTROL SYSTEM
1. Indoor unit
1.1. Electronic control circuit diagram
LED
301
R318
1801W
FULL
POWER
OUTDOOR
TEMP
LED
304
LED
302
LED
303
R317
360
1W
R316
100
1W
R315
100
1W
RED
YELLOW
GREEN
SG301
OPERATION
TIMER
GREEN
1W560
f2
b2
COM2
COM1
12
13
15 14 3 2 1 16 4
a1 b1 c1 d1 e1 f1
g1
g2
g1
f1
e2
e1
d2
d1
c2
c1
b1
a2
a1
R304
R305
R306
R307
R308
R309
R310
1W560
123456789
10
g2
f2e2d2c2b2a2
811567910
BCN301
1W180
1W180
1W560
1W180
1W180
R128
1K
TERMINAL
BOARD3P
DC
FAN
MOTOR
AUTO
RESTART
SELECT
0.01uF
250Vx2
275V0.1uF
C12A
C12B
275V0.1uF
NC
NC
NC
CLUSTER
BCN602
0.1uF
47uF
50V
1000p
10.0KF
47K
25V
10V
100uF
25V
47K
CN90
1000p
0.1uF
0.1uF
0.1uF
0.1uF
0.1uF
0.1uF
0.1uF
0.1uF
0.1uF
1uF
P83 P82 P81 P80
P05 P06 P70 P71 P72 P73 P74 P75 P76 P77 P67 P66 P65 P64 P31 P63 P62 P61 P60
VDD1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
80
79
78
77
76
75
74
73
72
71
70
69
68
67
66
65
P140
P141
P142
P143
P144
P145
64
63
62
61
60
59
58
57
56
55
54
53
52
51
P00
P01
P02
P03
P04
P131
P130
P20
P21
P22
P23
P24
P25
P26
P27
P150
P151
P152
P153
P154
P155
P156
P157
AVSS
VSS1
P30 P87 P86 P85 P84
0.01uF
25V 25V 25V
25V 25V
0.1uF
0.01uF
0.01uF
NC
0.1uF
100uF
10V
4.7K
4.7K
1K
R93
100K
C90
R90
7.5K
4.7K
4.7K
10K
10K
6.8KF
0.1u
50V
100u
35V
25V
0.1u
1M
1/4W
3.3K
910x2
WIRELESS
47K
4.7Kx2
POWER
MODEL
BZ1
1/4W
1.8K
KRC108S
KRC108S
NF1
D1N60
11K
2W
4.7K
56K
TEST
4.7K
4.7K
CLUSTER
4.7K
4.7K
6.8KF
3.3K
3.3K
6.8K
56K
16V47uF
10K
6.8K
R6
R7 100K
R8
R17
R19
R18
R29
R31
R32
R34
R37
R36
R71
R76
R77
R78
R80
R81
R86
R88
R95
R96
R100
R101
R108
R109
R110
R111
R112
R11410KF
D2
R105
R107
ZD1 HZ24-2
C1 35V100uF
C2 35V0.047uF
C350V0.01uF
C15
C16
C17
C18
C41 C42 C43
C44 C45 C46
C58
C59
C62
Q13
Q14
Q15
47K
JP8
JP9
JPW
R118
R119
R120
R40
DB1
D2SBA60
1/2W
1MX2
1K
1K
R85
R84
R41
1/2W1M
C12
275V0.1uF
NR1
R27
R26
C5
0.01u
250V
R9
Q11
KRC106S
R97
4.7K
25V
0.1uF
C13
R38
100K R39
16V
C301
C302
R83
10K
D4
D1N60
39K R28
1/2W
200K
1/2W
200K
R94
1K
C61
0.1uF
KRC108S
1/4W
R302
R303
LED310
3.6Kx2
R121 10K
25V
4.7uF
C60
R11
R10
2.7K
KID65004AF
NC
0.1uF
1000pF
C65 C66
50V
1000p
0.1uF
0.1uF 25V
25V
47K
C402
C401
25V
16V
KID65004AF
KID65004AF
25V
0.1uF
47uF
KID65004AF
KID65004AF
KID65783AF
C67
R116
10K
R127
4.7K
4.7K
47K
JP1
47K
R125
KID65004AF
10KF
2W
11K
JP2
NC
NC
CN1
2
1
6
4
4
5
11
OSC1
8MHz
5V
10K
9
50V
50V
10V
P110
P50
AVR1
AVR0
P111
P51
P52
P53
P54
P55
P56
P57
P17
P16
P15
P14
P13
P12
P11
P10
50494847464544434241403938373635343332
31
99989796959493929190898887868584838281
100
P120
P47
P46
P45
P44
P43
P42
P41
P40
REST
P124
P123
FLMDX2X1
REGC
VSS
VSS0
VDD
VDD0
25V
25V
25V
25V
25V
50V
50V
NC
25V
NC
106S
KRC
431
2
R92
470
5.1K
R91
HAJP
12V
KIA7815
5V
5V
1K
5V
5V
12V
SW401
SAFETYSW
0.01uF
50V
2
1
PC81716NIP
1
Vs
Vcc
2
7
Vm
GND
5
3
PG
1
1
2
3
4
4
D1N60
2
N
1
2W
10K
12345
GND
RESET
TOOL0
FLMD0
1
2
3
680
4
PC817XP3
3
1
3
2
PC817XP3
4
41
2
8.2K
680
TH1
PIPETEMP
TH2
R33
R35
R57
R70
R73
R79
R98
R99
R102
R113
R117
D1
ROOMTEMP
IC1
1K
1K
1K
R106
R104
PC4
PC5
PC6
PC7
CN3
C14
C40
C47
C48
C49
C50
C51
C52
C53
C54
C55
C56
Q2
IC13
IC5
10K
KRA224S
R63
8
CN1
NTC1
10D
SSR1
PR32MA11NXPF
R16
R1
3.3K
3.15A-250VFU1
TOOL1
VDD
5V
2M
R74
R75
1K
9
8
8
9
IC9
Q10
12V
IC11
CN18
IC12
12V
R82
10K
1
2
PC817XP3
4
3
PC1
PC817XP3
SERIALSIGNAL CIRCUIT
PC853HXP
3
2
PC2
+
R301
IC301
5V
CN17
CN10
47
BCN10
CN11
BCN302
PC
7 3
8 2
9 1
10612
8
10
987654321
13456
7
8
76543
1
8
1 2 3 4 5 6 7 8
9
8
IC7
R122
R124
R123
10K
10K
10K
6
TXD0
RXD0
54321
BLUE
S
C
B
A
5V
2
2
8765432
1
123456789
10
8
6
123
11
7
7
C68
50V
PANEL
SW1
SW2
PANEL
1
2
5V
234
1
234
1
47
IC401
R401
+
987654321
54321
LOUVERM H
THERMISTOR
THERMISTOR
IC8
6
CN13
CN14
CN15
CN16
BCN401
CN15
R134
R132
R135
R133
5V
BR
BK
WH
RD
1K
1K
13
9 9
5V
D18
5
5
65432
1
CN17
FLASH
11
9
10
5V
10
9
11
2
1
2
1
2
1
CN608
CN609
BCN604
10
987654321
5V
131112
1098
7
12V
5V
BCN602
BCN601
CN601
CN602
CN603
CN19
1 2 3 4 5
IC14
9
8
1 2 3 4 5 6 7 8
987654321
CN15
CN14
6
6
54321
HANGM R
HANGM L
54321
1 2 3 4 5 6 7 8 9
87654
321
1 2 3 4 5
PANELM L
PANELM R
1 2 3 4 5
BCN603
BCN604
CN604
CN605
CN606
CN607
4.3KF
R129
10K
1W100K
BLUE
R137 680
E
C7
C8
C6
G(Y)
10KF
Q3
KRA106S
R51
2.7K
R52
1.5K
R89
2.2M
R72
6.8K
R61
3.3K
R64
3.3K
R136
56K
IC3
KIA431
R54
10KF
R49
220
C30
220uF
10V
C23
10uF
16V
C29
1000uF
25V
PC8
PC817x3
R43
47
R42
120K
1/2W
C21
1000pF
1KV
D10
RU2CV1
D5
D1FL20U
R45
3.3
C19
100uF
50V
C24
47uF
16V
D8
D1FL20U
D7
S3L20U
ZD3
HZ27-2
C20
120uF
450V
R48
100K
C31
0.1uF50V
R50
100K
R87
1.5M
PC817XP3
19V
R5310KF
IC2TOP258PN
C220.1uF 50V
R46
12V
PC8
CONTROL
4
2
1
M
C
D
S
S
S
S
8
7
6
5
5V
11
13
7
8
5
15
14
12
10
9
432
TR1
R4410
220
16
6
C250.01uF 50V
12V
275V
0.1uF
Page 8
12KHR-N
2 – 4
1.2. Display circuit diagram
LED
301
R318
180 1W
FULL
POWER
OUTDOOR
TEMP
LED
304
LED
302
LED
303
R317
360
1W
R316
100
1W
R315
100
1W
RED
YELLOW
GREEN
SG301
OPERATION
TIMER
GREEN
1W 620
f2
b2
COM2
COM1
12
13
15 14 3 2 1 16 4
a1 b1 c1 d1 e1 f1
g1
g2
g1
f1
e2
e1
d2
d1
c2
c1
b1
a2
a1
R304
R305
R306
R307
R308
R309
R310
1W 620
123456789
10
g2
f2e2d2c2b2a2
811567910
BCN301
1W 220
1W 220
1W 620
1W 220
1W 220
0.1uF
47uF
16V
C301
C302
1/4W
R302
R303
LED310
7.5Kx2
C402
C401
25V
16V
25V
0.1uF
47uF
SW401
SAFETY SW
CN18
+
R301
IC301
CN17
47
BCN302
PC
7 3
8 2
9 1
10
6128
10
9
8
7
6
5
4
3
2
1 1
2345678
9
10
8
6
123
11
7
7
2
341
2
341
47
IC401
R401
+
BCN401
13
9 9
5
5
10
9
8
7
6
5
4
3
2
1
131112
10
987
12V
5V
BCN602
BCN601
CN601
CN602
CN603
BLUE
Page 9
12KHR-N
2 – 5
1.3. Printed wiring board
For 2KHN model main PWB
For 2KHN model sensor PWB
From cluster unit From fan motor From horizontal louver motor
From pipe thermistor (relay connector)
From sensor PWB
To main PWB
To vertical louver motor(left)
To vertical louver motor(right)
Page 10
12KHR-N
2 – 6
For 2KHN model connection PWB
For 2KHN model display PWB
To main PWB To main PWB To main PWB To main PWB
From hang motor left
From panel motor left
From panel SW left
From panel SW right
From panel motor right
From hang motor right
From display PWB(black)
From display PWB(yellow)
To connection PWB
Page 11
12KHR-N
2 – 7
2. Outdoor unit
2.1. Electronic control circuit diagram
-*40176&114
˴㧯㧵㧾㧯㨁㧵㨀˴㧰㧵㧭㧳㧾㧭㧹
㧾
㧯
㧜ǡ
㧜ǡ
㧜ǡ
㧞㧣㧜㧷㧲
㧞㧣㧜㧷㧲
㧜㧚㧜㧞
㧢
㧡
㧥
㧤
㧣
㨀
㧾
㧝
㧞
㧝
㧢
㧡
㧠
㧟
㧝
㧣
㧡
㧟㧠㧞
㧠㧟㧝
㧞
㧤
㧣
㧡
㧢
㧝
㧞
㧠
㧟
㧣
㧤
㧢
㧡
㧠㧟
㧞
㧝
㧝㧥 㧝㧤 㧝㧣㧝㧢㧝㧡 㧝㧠 㧝㧟㧝㧞㧝㧝 㧝㧜㧥
㧠㧣㧜㧷㧲㧟
㧾㧡㧝㨪㧡㧟
㧝㧛㧞㨃
㧜㧚㧝Ǵ
㧯㧟㧤
㧼
㧔㧯㧺㧕
㧹㧻㧺㧵㨀㧻㧾
㧠
㧝
㧞
㧟
㧰㧱㧮㨁㧳
㧯㧺㧙㧞
㧟㧠㧞
㧝
㧲㧸㧭㧿㧴
㧯㧺㧰
㧥
㧝㧞㧟㧠㧡㧢㧣
㧤
㧯㧺㧝㧜
㧝
㧭
㧲
㨁
㧠
㧞㧡㧜㨂
㧝㧡㧭
㧲㨁㧡
㧞㧡㧜㨂
㧞㧡㧡㧷㧲
㧾㧝㧞㧢
㧹
㨖
㧜㧚㧜㧝Ǵ㧡˴˴㧯㧢㧡㨪㧢㧥
㧜㨂
㧝㧜㧷㧡˴˴㧾㧢㧟㨪㧢㧣
㧹㧾㨅㧝
㧯㧺㧝㧞
㧤
㧥
㧽㨀㧿
㧾
㧾
㨀
㧿
㧽
㧜㨂
㧯㧟㧞
㧜㧚㧝Ǵ
㧝㧜㧜
㧾㧣㧥
㧝Ǵ
㧡㧜㨂
㧾㧣㧣
㧯㧟㧟
㧾㧣㧤
㧯㧥㧤
㧾㧥㧞
㧾㧥㧠
㧾㧥㧟
㧝㧜㧜㧜㧼㧟
㧜㧚㧝Ǵ
㧜㧚㧝Ǵ
㧯㧥㧡
㧝㧜㨂
㧯㧥㧠
㧝㧜㧜Ǵ
㧜㨂
㧶㧼㧲
㨏
㧶㧼㧞
㧶㧼㧝
㧜㨂
㨖
㧜㨂
㧡㨂
㨎
㨍
㧵㧯㧣
㧜㨂
㧾㨅㧝
㧝㧜㧷
㧾㧤㧟
㧡㨂
㧜㨂
㧯㧞㧥
㧜㧚㧝Ǵ
㧯㧺㧟
㧜㨂
㧲㨁㧟
㧞㧡㧜㨂
㧞㧭
㧯㧣㧤
㧾㧤㧢
㧢㧚㧤㧷㧶
㧠㧣Ǵ
㧝㧜㨂
㧜㨂
㧾㧤㧠
㧥㧚㧡㧟㧷㧲
㧾㧝㧝㧟
㧝㧥㧚㧝㧷㧲
㧯㧟㧝
㧜㧚㧝Ǵ
㧯㧢
㧯㧣
㧯㧡
㧯㧠
㧗
㧔㧸㧱㧰˴㧯㧵㧾㧯㨁㧵㨀㧕
㧷㧵㧰㧢㧡㧜㧜㧠㧭㧼
㧣㧡㧜Ǵ
㧯㧥
㧯㧝㧜
㧣㧡㧜Ǵ
㧾㧡
㧝㧛㧞㨃
㧟㧜㧜㧷㧲
㧝㧛㧞㨃
㧾㧞
㧝㧛㧞㨃
㧾㧝㧞㧡
㧝㧛㧞㨃
㧢㧟㧜㨂
㧯㧝㧠
㧜㧚㧟㧟Ǵ
㧝㧟㧷㧲
㧾㧝㧞㧣
㧝㧟㧷㧲
㧾㧝㧞㧤
㧾㧣
㧾㧢
㧞㧟㧚㧣㧷㧲
㧞㧟㧚㧣㧷㧲
㧡㨂
㧝㧜㧜㧜㧼
㧯㧣㧢
㧾㧝㧠㧠
㧝㧜㧷
㧾㧤㧝
㧝㧡㨂
㧰㧞㧝
㧰㧞㧞
㧰㧞㧟
㧞
㧝㧟
㧝㧠
㧝㧹
㧾㧝㧝㧠
㧾㧝㧝㧡
㧝㧚㧤㧷
㧝㧚㧤㧷
㧾㧢㧞
㧝㧚㧤㧷
㧾㧢㧜
㧝㧚㧤㧷
㧾㧢㧝
㧰㧝㧟
㧰㧝㧞
㨀㧥
㨀㧤
㨀㧣
㧲㧯㧠㧲㧯㧟
㧿
㧡㨂
㧞㧣㧜
㧞㧣㧜
㧢㧚㧤㧷
㧾㧠㧟
㧯㧢㧭
㧯㧣㧭
㧯㧡㧭
㧯㧠㧭
㧝㧡㧭
㧞㧡㧜㨂
㧲㨁㧢
㧝㧜㧷
㧝㧜㧷
㧜㨂
㧻㧿㧯㧝˴㧠㧹㧴㨦
㧡㨂
㧾㧝㧡㧠
㧝㧜㧷
㧾㧝㧡㧡
㧝㧜㧷
㧸㧱㧰㧝
㧾㧣㧟
㧞㧚㧞㧷
㧡㨂
㧡㨂
㧾㧝㧟㧠˴㧝㧜㧜
㧾㧝㧟㧡˴㧝㧜㧜
㧾㧝㧟㧢˴㧝㧜㧜
㧾㧝㧟㧣˴㧝㧜㧜
㧾㧝㧟㧞˴㧝㧜㧜
㧾㧝㧟㧟˴㧝㧜㧜
㧜㨂
㧡㨂
㧯㧟㧜
㧝㧜㨂
㧝㧜㧜Ǵ
㧯㧥㧟
㧜㧚㧝Ǵ
㧡㨂
㧡㨂
㧶㧼㧝㧢
㧾㧟㧡
㧾㧟㧠
㧰㧞㧠
㧾㧝㧝㧢
㧝㧷
㧺
㧝㧜㧜㧜㧼
㧯㧤㧤
㧜㨂
㧡㨂
㨃
㧺
㨂
㨁
㧯㧥
㧣
㧜㧚
㧜㧝
Ǵ
㧜㨂
㧡㨂
㧝
㧷㧵㧭㧟㧟㧥
㧵㧯㧤
㧡
㧟
㧠
㧝㧝
㧞㧡㨂
㧯㧢㧠
㧜㧚㧝Ǵ
㧝㧜㧥㧤㧣㧢
㧝㧞
㧡㧜㨂
㧟㧟㧜㧼
㧯㧢㧟
㧾㧡㧥˴㧝㧜㧜
㧾㧡㧤˴㧝㧜㧜
㧾㧡㧣˴㧝㧜㧜
㧯㧢㧞
㧡㧜㨂
㧟㧟㧜㧼
㧟㧟㧜㧼
㧡㧜㨂
㧯㧢㧝
㧾㧝㧝㧞
㧝㧡㧷
㧯㧤㧢
㧜㧚㧝Ǵ
㧾㧥㧥˴㧝㧜㧜
㧞㧡㨂
㧜㧚㧝Ǵ
㧯㧢㧜
㧼㧯㧤㧝㧣㧝㧢㧺㧵㧼
㧾㧝㧜㧟㧘㧝㧜㧠
㧝㨃˴㧠㧣㧷㧞
㧾㧝㧜㧝㧘㧝㧜㧞
㧝㧛㧞㨃˴㧠㧣㧷㧞
㧾㧝㧜㧠
㧾㧝㧜㧟
㧾㧝㧜㧞
㧾㧝㧜㧝
㧞㧡㧜㨂
㧟㧚㧝㧡㧭
˴˴㧗
㧠㧞㧜㨂㧠㧞㧜㨂
˴˴㧗
㧞㧡㧜㨂
㧠㧣㧜㧜㨜㧲
㧞㧡㧜㨂
㧠㧣㧜㧜㨜㧲
㧞㧡㧜㨂
㧠㧣㧜㧜㨜㧲
㧞㧡㧜㨂
㧠㧣㧜㧜㨜㧲
㧰㧮㧝
㧳㧾
㧳㧾
㧹㧾㨅㧝
㧼㨀㧯
㧵㧺
㧻㨁㨀
㧯㧟
㧯㧝
㧡㧝㧜㧷
㧝㧛㧠㨃
㧾㧤㧤
㧝㧛㧠㨃
㧡㧝㧜㧷
㧯㨀㧝
㧞㧣㧡㨂
㧝Ǵ㧲
㧞
㧠
㧯㧞
㧝Ǵ㧲
㧞㧣㧡㨂
㧝Ǵ㧲
㧞㧣㧡㨂
㧺㧾㧝
㧿㧭㧝
㧠
㧟
㧟
㧝
㧸㧠
㧸㧟
㧞
㧝
㧜㨂
㧾㧤㧥
㧳㧾
㧽㧡
㧰㧮㧞
㧾㧝㧝㧝
㧞㧚㧞㧷
㧞㧞㧜Ǵ
㧝㧚㧜㧷㧲
㧰㧞
㧾㧥㧜
㧝㧜㧷
㧾㧝㧠㧣
㧾㧥㧝
㧯㧣㧥
㧝㧜㨂
㧷
㧾㧯㧝㧜㧞㧿
㧽㧢
㧯㧤㧞
㧜
㧚㧜㧝Ǵ
㧝
㧜㧜㧜㧼
㧯㧤㧟
㧾㧝㧜㧢
㧟㧚㧟㧷
㧞㧞㧷
㧜㨂
㧾㧝㧜㧡
㧲㨁㧞
㧡㨂㧡㨂
㨐
㨑
㧝㧜㧜㧷
㧾㧝㧠㧢
㧯㧤㧝
㧜㧚㧜㧝Ǵ
㧝
㧠
㧟
㧞
㧼㧯㧟
㧞㧜㧚㧡㧷㧲
㧾㧡㧢
㧞㧜㧚㧡㧷㧲
㧾㧡㧠
㧞㧜㧚㧡㧷㧲
㧾㧡㧡
㧜㨂
㧾㨅㧝
㧝㧞㧜
㧝㧛㧞㨃
㧜㧚㧜㧟㧟Ǵ
㧺㧾㧞
㧞㧣㧡㨂
㧯㧺㧠
㧯㧞㧢
㧾㧞㧤
㧟
㧝
㨐
㨑
㨂㧭㧸㨂
㧯㧻㧵㧸
㧠㧙㨃㧭㨅
㧜㨂
㧞㧡㧜㨂
㧠㧣㧜㧜㨜㧲
㧯㧝㧝
㧯㧝㧝㧭
㧢㧟㧜㨂
㧮㨀㧢
㧮㨀㧡
㧜㨂
㧙㧼
㧝
㧞
㧟
㧠
㧼㧯㧤㧝㧣㨄㧼㧟
㧽㧣
㧜㨂
㧷㧾㧯㧝㧜㧡㧿
㨏
㧼㧯㧠
㧝㧤
㨂㧙㧼
㧡㨂
㧜㨂
㧯㧣㧣
㧜㧚㧜㧝Ǵ
㧜㨂
㧾㧤㧡
㧢㧚㧤㧷
㧜㨂
㧷㧾㧯㧝㧜㧡㧿
㧽㧝㧜
㧷㧾㧭㧝㧜㧢㧿
㧝㧡㨂
㧽㧥
㧶㧼㧱
㧠㧚㧣㧷
㧾㧟㧜
㧡㨂
㧯㧺㧱
㧵㧯㧢
㧾㧟㧟
㧜㨂
㧾㧟㧝
㧾㧟㧞
㧞㧚㧞㧷
㧝㧜㧷
㧝㧷
㧝㧜㧷
㧾㧝㧞㧥
㧜㨂
㨔
㧾㧝㧟㧜
㧝㧜㧷
㧯㧥㧞
㧜㧚㧜㧝Ǵ㧜㧚㧝Ǵ
㧯㧞㧞
㧾㧡㧜
㧵㧼㧹
㧺
㨆
㧯㧵㧺
㧞㧟
㧞㧞
㧞㧝
㧞㧠
㧝㧡
㧞㧜
㧼㧿㧞㧝㧥㧢㧠㧙㧯
㧡㨃
㧾㧠㧥
㧝㧚㧤㧷
㨆㧰㧟
㧝㧜㧜㧜㧼
㧯㧝㧞㧞
㨅
㧯㧟㧥
㧝㧜㧜㧜㧼
㧯㧠㧜
㧝㧜㧜㧜㧼
㧯㧠㧝
㧝㧜㧜㧜㧼
㧯㧠㧞
㧝㧜㧜㧜㧼
㧝㧜㧜㧜㧼
㧝㧜㧜㧜㧼
㧯㧡㧡
㧯㧡㧟
㧯㧡㧝
㧯㧠㧥
㧜㧚㧝Ǵ
㧜㧚㧝Ǵ
㧜㧚㧝Ǵ
㧜㧚㧝Ǵ
㧝㧜㧜Ǵ
㧝㧜㨂
㧯㧠㧣
㧜㨂
㧯㧠㧢
㧝㧜㧜㧜㧼
㧡㨂
㧾㧠㧡
㧝㧜㧷
㧾㧠㧢
㧯㧠㧤
㧜㧚㧝Ǵ
㧝㧷
㧯㧠㧡
㧜㨂
㧰㧝㧝
㧟㧟㧜Ǵ
㧝㧡㨂
㧡
㧝㧛㧠㨃
㧟㧟㧞
㧟㧟㧞
㧝㧛㧠㨃
㧝㧠
㧝㧢
㧝㧞
㧝㧝
㧝㧜
㧝㧟
㧝㧣
㧣
㧞㧝
㧠
㧢
㧞㧞
㧟
㧤
㧞㧟
㧞
㨂㧼㧯
㧵㧼㧹
㧞㧡㨂
㧯㧟㧣
㧝㧜㧜Ǵ
㧞㧡㨂
㧞㧡㨂
㧯㧡㧠
㧝㧜㧜Ǵ
㧞㧡㨂
㧰㧥
㧰㧝㧜
㧝㧜㧜Ǵ
㧯㧡㧞
㧰㧤
㧯㧡㧜
㨂㨃㧲㧮
㨂㨁㧲㧿
㨂㨁㧲㧮
㨃㧺
㨂㧺
㨁㧺
㨃㧼
㨂㨃㧲㧿
㨂㧼㧵
㨂㧼
㨂㨂㧲㧿
㨂㨂㧲㧮
㨁㧼
㨂㧺㧯
㧲㧜
㨂㧺㧵
㧯㧠㧟
㧯㧠㧠
㨆㧰㧠
㨁
㨄
㨂
㨅
㨆
㧜㧚㧜㧝Ǵ
㨃
㧜㧚㧝Ǵ
㧯㧝㧞㧠
㧵㧯㧡
㧞
㧝
㧟
㧜
㨂
㧙
㧼
㧾㧞㧠
㧞
㧞㧷
㧾㧞㧝
㧜㨂
㧡㨂
㧵㧯㧠
㧝
㨃
㧾
㧞㧣
㧵㧯㧟
㧜㧚㧝Ǵ
㧯㧤㧡
㧝㧤㨂㧙
㧼
㧢㧤
㧣㧤㧜㧡
㧜㧚㧝
Ǵ
㧯㧞㧟
㧝㧚㧡㧷
㧾㧞㧡
㧝㧚㧢㧡㧷㧲
㧜㧚㧜
㧟㧟Ǵ
㧯㧞㧝
㧢㧤㧷
㧾㧞㧟
㧾㧞㧢
㧠
㧚㧢㧠㧷㧲
㧝㧡㨂
㧟㧡㨂
㧟㧡㨂
㧰㧝㧠
㧯㧤㧠
㧝㧡㧜Ǵ
㧾
㧤㧣
㧝
㧜㧷
㧯
㧞㧜
㧞
㧡㨂
㧾
㧞㧞
㧯㧝㧥
㧢㧤㧜Ǵ
㧾
㧤
㧞
㧝㧜㧷
㧝㧜㧷
㧝㧡㧜Ǵ
㧠㧚㧣㧷
㧾㧞㧥
㧝㧜
㧝㧝
㧢㧤
㧜㧼
㧞㧷
㧰㧝㧡
㧯
㧝㧢
㧯㧝
㧤
㧰㧠
㧟㧟㧜㧜
㧼
㨆
㧰
㧝
㧽㧝
㧟㧚㧟㧷
㧰㧡
㧝
㧾㧝㧣
㧝㧜Ǵ
㧡㧜㨂
㧯
㧝㧡
㧞㧞㧜㧼㧲
㧰
㧢
㧰㧣
㧞
㨃
㧝㧜
㧾㧝㧥
㧰㧟
㧟
㧝
㧚㧡㧷
㧾㧝㧤
㧾㧞㧜
㧵
㧯㧞
㧿
㨀
㧾
㧙㧸㧠㧣㧞
㧯㧞㧣
㧝
㧷㨂
㧝㧚
㧢
㧝㧚㧢
㧾㧝
㧡
㧾㧝
㧢
㧢㧤㧜
㨂㨏㨏
㧰㨞㨍㨕
㨚
㧳㧺㧰
㧢
㧥
㧝㧜
㧣
㧤
㧝˴㨪˴㧠
㧻㧯㧼㧛㧲㧮
㧾㧝
㧠
㧯㧝㧣
㧠㧣㧜㧼
㧜㨂
㧾㧥
㧾㧤
㧝㧛㧞㨃˴㧝㧹
㨖
㧲㧮
㧞㧡㧜㨂
㧯㧝㧞
㧝㧷
㧞㨃㧞㨃
㧝㧷
㧾㧠㧜
㧰㧝
㧜㧚㧝Ǵ
㧯㧝㧟
㧠㧣㧜㧜㧼
㧾㧠
㧟㧚㧟㧷
㧝㧷
㧞㨃
㧾㧠㧝㧾㧠㧞
㧞
㧠
㧟
㧼㧯㧝
㧝
㧼㧯㧤㧝㧣㨄㧼㧟
㧡㨂
㧟
㧝
㧞㧚㧣㧷
㧾㧣㧡
㨎
㧾㧣㧠
㨍
㧝㧜㧜㧜㧼
㧯㧣㧡
㧜㨂
㧠㧚㧣㧷
㧾㧣㧢
㧡㧢㧷
㧠
㧞
㧼㧯㧤㧡㧟㧴㨄㧼
㧼㧯㧞
㧡㨂
㧜㨂
㧵
㧾㧝㧠㧟
㧞㧜㧷㧲
㧞㧜㧷㧲
㧡㨂
㧟
㧞
㧝㧡㨂
㧤
㧠
㧶㧼㧡
㧶㧼㧢
㧵㧯㧥
㧾㧝㧞㧜
㨆
㨅
㧜㨂
㧾
㧞㧜㧜㧷㧲
㧞㧜㧜㧷㧲
㧾㧝㧡㧝
㧾㧝㧡㧜
㧯㧥㧜
㧝㧜㧜㧜㧼
㧰㧝㧤
㧝㧷
㧾㧝㧞㧠
㧝
㧜㧚㧝Ǵ
㧯㧤㧥
㧡㨂
㧾㧠㧣㧘㧠㧣㧭
㧾㧠㧤㧘㧠㧤㧭
㧝㧚㧜㨗㧲
㧢㧚㧠㧥㧷㧲
㧝㧛㧞㨃˴㧡㧝㧜㧷
㧝㧜㧜㧷
㧾㧤㧜
㧜㧚㧝Ǵ
㧜㨂
㧡㨂
㧸㧡
㧟㧟㧜
㧾㧝㧜㧣
㧾㧞㧜㧜
㧝㧷
㧾㧱㧰
㨃㧴㧵㨀㧱
㧻㧾㧭㧺㧳㧱
㧝㧜㧜㧷㧲
㧾㧝㧞㧟
㧔㧱㧱㧼㧾㧻㧹˴㧯㧵㧾㧯㨁㧵㨀㧕
㧿㧱㨀
㧿㧱㨀
㧔㧯㧻㧹㧼˴㧼㧻㧿㧵㨀㧵㧻㧺˴㧵㧺㧿㧼㧱㧯㨀˴㧯㧵㧾㧯㨁㧵㨀㧕
㧲˴㧻㨁㨀
㧔㧵㧼㧹˴㧰㧾㧵㨂㧱˴㧯㧵㧾㧯㨁㧵㨀㧕
㧝㧞㨂
㧝㧞㨂
㧝
㧞
㨂
㧔㧿㨃㧵㧯㧴㧵㧺㧳˴㧯㧵㧾㧯㨁㧵㨀㧕
㧰㧞㧜
㧹
㧜㨂
㧵
㧜㧚㧝Ǵ
㧯㧝㧞㧡
㧿
㨛㨡㨞㨏
㨑
㨀㧴㧝
㨀㧴㧱㧾㧹㧵㧿㨀㧻㧾
㧡㨂
㧔㧞㧙㨃㧭㨅˴㨂㧭㧸㨂㧱㧕
㧔㧿㨁㧯㨀㧵㧻㧺㧕
㧔㧻㨁㨀㧰㧻㧻㧾˴㨀㧱㧹㧼㧕
㧔㧯㧻㧹㧼㧾㧱㧿㧿㧻㧾㧕
㧢㧚㧤㧷㧲㧡
㧾㧢㧤㨪㧣㧞
㧯㧺㧤
㧝㧜
㧢㧡㧠㧟㧞
㧣㧥㧤
㨀㧴㧞
㨀㧴㧟
㨀㧴㧠
㨀㧴㧡
㧝
㧔㧴㧱㧭㨀㧙㧱㨄㧕
㧡㧜㨂
㧞㧡㧜㨂
㧞㧜㧭
㧲㨁㧝
㧝㧹
㧝㧛㧞㨃
㧾㧝
㧮㧸㨁㧱
㧮㧸㨁㧱
㧾㧱㧰
㧛㧳㧾㧱㧱㧺
㨅㧱㧸㧸㧻㨃
㧮㧾㧻㨃㧺
㧝
㧞
㧲㧯㧡
㧺
㧝
㧞
㧮㨀㧞
㧮㨀㧝
㧮㨀㧟
㧮㨀㧠
㧯㧥㧝
㧜㧚㧝Ǵ
㨔
㧺
㧝
㧼㧻㨃㧱㧾
㧿㨁㧼㧼㧸㨅
㧔㧰㧯˴㧻㨂㧱㧾˴㧯㨁㧾㧾㧱㧺㨀˴㧵㧺㧿㧼㧱㧯㨀˴㧯㧵㧾㧯㨁㧵㨀㧕
㧔㨀㧴㧱㧾㧹㧵㧿㨀㧻㧾˴㧯㧵㧾㧯㨁㧵㨀㧕
㧔㧼㧭㧹˴㧯㧵㧾㧯㨁㧵㨀㧕
㧔㧠㨃㧭㨅˴㨂㧭㧸㨂㧱˴㧰㧾㧵㨂㧱˴㧯㧵㧾㧯㨁㧵㨀㧕˴
㧔㧵㧺㨂㧱㧾㨀㧱㧾˴㧯㨁㧾㧾㧱㧺㨀˴㧵㧺㧿㧼㧱㧯㨀˴㧯㧵㧾㧯㨁㧵㨀㧕
㧔㧻㨂㧱㧾˴㨂㧻㧸㨀㧭㧳㧱˴㧵㧺㧿㧼㧱㧯㨀˴㧯㧵㧾㧯㨁㧵㨀㧕
㧔㧲㧭㧺˴㧹㧻㨀㧻㧾˴㧰㧾㧵㨂㧱˴㧯㧵㧾㧯㨁㧵㨀㧕
㧔㧲㧭㧺˴㧹㧻㨀㧻㧾㧕
㧔㧾㧱㧿㧱㨀˴㧯㧵㧾㧯㨁㧵㨀㧕
㧱㨄㧼㧭㧺㧿㧵㧻㧺˴
㧔㧿㧱㧾㧵㧭㧸˴㧯㧵㧾㧯㨁㧵㨀㧕
㧮㧸㨁㧱
㧮㧻㧭㧾㧰
㨀㧱㧾㧹㧵㧺㧭㧸
㧿㧙㧤㧜㧤㧠㧞㧯㧺㨅
㧜㨂
㧯㧟㧢
㧯㧟㧡
㧯㧟㧠
㧾㧟㧢˴㧝㧷
㧾㧟㧣˴㧝㧷
㧾㧟㧤˴㧝㧷
㨁
㨂
㨃
㨂㧭㧸㨂㧱˴㧯㧻㧵㧸
㧞㧿㧭㧝㧡㧤㧢㧳
㧝㧜㧞
㨀㨔㨑㨞㨙㨍㨘
㨒㨡㨟㨑
㧟㧞㧟㧝㧟㧜㧞㧥㧞㧤㧞㧣㧞㧢㧞㧡㧞㧠㧞㧟㧞㧞㧞㧝㧞㧜
㧡㧞㧡㧟㧡㧠㧡㧡㧡㧢㧡㧣㧡㧤㧡㧥㧢㧜㧢㧝㧢㧞㧢㧟㧢㧠
㧼㧜㧣
㧼㧝㧜
㧼㧝㧝
㧼㧝㧞
㧼㧝㧟
㧼㧝㧠
㧼㧝㧡
㧼㧝㧢
㧼㧝㧣
㧼㧞㧜
㧼㧞㧝
㧼㧞㧞
㧼㧞㧟
㧼㧞㧠
㧼㧞㧡
㧼㧞㧢
㧼㧞㧣
㨂㧿㧿
㧼㧟㧜
㧔㨁㧕
㧼㧠㧠
㧼㧠㧡
㧼㧠㧢
㧼㧡㧜
㧼㧡㧝
㧼㧡㧞
㧼㧡㧟
㧼㧡㧠
㧼㧡㧡
㧼㧡㧢
㧼㧡㧣
㧭㨂㧯㧯
㧭㨂㧾
㧭㨂㧿㧿
㧼㧢㧜
㧼㧢㧝
㧼㧢㧞
㧼㧢㧟
㧹㧰㧜
㧔㧮㧕
㧔㧻㧕
㧔㨅㧕
㧔㨃㧕
㧵㧯㧝
㧾㧿㨀
㧹㧰㧝
㧹㧰㧞㨄㧝㨄㧜
㨂㧿㧿
㧼㧜㧜
㧼㧜㧝
㧼㧜㧞
㧼㧜㧟
㧼㧜㧠
㧼㧜㧡
㧼㧜㧢㧼㧟㧝
㧼㧟㧞
㧼㧟㧟
㧼㧟㧠
㧼㧟㧡
㨂㧯㧯㧯㧼㧟㧢
㧼㧟㧣
㧼㧠㧜
㧼㧠㧝
㧼㧠㧞
㧼㧠㧟
㧔㨄㧕
㧔㨂㧕
㧔㨅㧕
㧔㨃㧕
㧔㨆㧕
㧔㨁㧕
㧔㨂㧕
㧔㨃㧕
㧟㧠 㧟㧡 㧟㧢㧟㧣 㧟㧤 㧟㧥 㧠㧜㧠㧝 㧠㧞 㧠㧟 㧠㧠㧠㧡㧠㧢 㧠㧣 㧠㧤 㧠㧥 㧡㧜㧡㧝㧟㧟
㧾㧝㧝㧜
㧝㧡㧜
㨑㨤㨜㨞㨑㨟㨟㨑㨟˴㨠㨔㨑˴㨒㨛㨘㨘㨛㨣㨕㨚㨓˴㨢㨛㨘㨠㨍㨓㨑㧚
㨀㨔㨑˴㨟㨕㨓㨚˴㨛㨒˴㨑㨍㨏㨔˴㨜㨛㨣㨑㨞˴㨟㨡㨜㨜㨘㨥
㧝㧡㨂
㧝㧞㨂
㧡㨂
㧜㨂
Page 12
12KHR-N
2 – 8
2.2. Printed wiring board
From Compressor (R) (Orange)
From Compressor (C) (White)
From Compressor (S) (Red)
To Reactor (Gray)
From Fan Motor
To Reactor (Gray)
From 4 Way Valve
From Expansion Valve
From Thermistor
To Terminal Board (1) (Brown)
To Terminal Board (N)(Blue)
To Control Box (Green/Yellow)
To Terminal Board (2) (Red)
From Terminal Board
Page 13
12KHR-N
2 – 9
[3] FUNCTION
1. Function
1.1. Restart control
Once the compressor stops operating, it will not restart for 180 sec­onds to protect the compressor.
Therefore, if the operating compressor is shut down from the remote control and then turned back on immediately after, the compressor will restart after a preset delay time.
(The indoor unit will restart operation immediately after the ON switch is operated on the remote control.)
1.2. Cold air prevention control
When the air to air heat pump starts up in heating mode, the indoor unit fan will not operate until the temperature of the indoor unit heat
exchanger reaches about 23qC in order to prevent cold air from blow-
ing into the room.
Also, the indoor unit fan operates at low speed until the temperature of
the indoor unit heat exchanger reaches about 38qC so that people in
the room will not feel chilly air flow.
1.3. Indoor unit heat exchanger freeze prevention control
If the temperature of the indoor unit heat exchanger remains below
0qC for 4 consecutive minutes during cooling or dehumidifying opera-
tion, the compressor operation stops temporarily in order to prevent freezing.
When the temperature of the indoor unit heat exchanger rises to 2qC
or higher after about 180 seconds, the compressor restarts and resumes normal operation.
1.4. Outdoor unit 2-way valve freeze prevention control
If the temperature of the outdoor unit 2-way valve remains below 0qC
for 10 consecutive minutes during cooling or dehumidifying operation, the compressor operation stops temporarily in order to prevent freez­ing.
When the temperature of the 2-way valve rises to 10qC or higher after
about 180 seconds, the compressor restarts and resumes normal operation.
1.5. Indoor unit overheat prevention control
During heating operation, if the temperature of the indoor unit heat exchanger exceeds the indoor unit heat exchanger overheat preven-
tion temperature (about 45 to 54qC) which is determined by the operat-
ing frequency and operating status, the operating frequency is decreased by about 4 to 15 Hz. Then, this operation is repeated every 60 seconds until the temperature of the indoor unit heat exchanger drops below the overheat protection temperature.
Once the temperature of the indoor unit heat exchanger drops below the overheat protection temperature, the operating frequency is increased by about 4 to 10 Hz every 60 seconds until the normal oper­ation condition resumes.
If the temperature of the indoor unit heat exchanger exceeds the over­heat protection temperature for 60 seconds at minimum operating fre­quency, the compressor stops operating and then restarts after about 180 seconds, and the abovementioned control is repeated.
1.6. Outdoor unit overheat prevention control
During cooling operation, if the temperature of the outdoor unit heat exchanger exceeds the outdoor unit heat exchanger overheat preven-
tion temperature (about 55qC), the operating frequency is decreased
by about 4 to 15 Hz. Then, this operation is repeated every 60 sec­onds until the temperature of the outdoor unit heat exchanger drops to
about 54qC or lower.
Once the temperature of the outdoor unit heat exchanger drops to
about 54qC or lower, the operating frequency is increased by about 4
to 10 Hz every 60 seconds until the normal operation condition resumes.
If the temperature of the outdoor unit heat exchanger exceeds the out­door unit heat exchanger overheat protection temperature for (120 sec
: outdoor temperature t 40qC x 60 sec : outdoor temperature < 40qC)
at minimum operating frequency, the compressor stops operating and then restarts after about 180 seconds, and the abovementioned con­trol is repeated.
1.7. Compressor overheat prevention control
If the temperature of the compressor exceeds the compressor over-
heat prevention temperature (110qC), the operation frequency is
decreased by about 4 to 10 Hz. Then, this operation is repeated every 60 seconds until the temperature of the compressor drops below the
overheat protection temperature (100qC).
Once the temperature of the compressor drops below the overheat protection temperature, the operating frequency is increased by about 4 to 10 Hz every 60 seconds until the normal operation condition resumes.
If the temperature of the compressor exceeds the overheat protection temperature (for 120 seconds in cooling operation or 60 seconds in heating operation) at minimum operating frequency, the compressor stops operating and then restarts after about 180 seconds, and the abovementioned control is repeated.
1.8. Startup control
When the air to air heat pump starts in the cooling or heating mode, if
the room temperature is 2qC higher than the set temperature (in cool-
ing operation) or 3.5qC lower (in heating operation), the air to air heat
pump operates with the operating frequency at maximum. Then, when the set temperature is reached, the air to air heat pump operates at the operating frequency determined by fuzzy logic calculation, then enters the normal control mode after a while.
Compressor operation
ON operation on remote control
OFF operation on remote control
Compressor ON
Compressor ON Compressor can
turn ON
Compressor remains OFF for 180 seconds
Indoor unit heat exchanger temperature
38
23
35
21
Set fan speed
Indoor unit fan at low speed
Indoor unit fan in non-operation
Page 14
12KHR-N
2 – 10
1.9. Peak control
If the current flowing in the air to air heat pump exceeds the peak con­trol current the operation frequency is decreased until the current value drops below the peak control current regardless of the frequency control demand issued from the indoor unit based on the room temper­ature.
1.10. Outdoor unit fan delay control
The compressor stops immediately after cooling, dehumidifying or heating operation is shut down, but the outdoor unit fan continues operation for 50 seconds before it stops.
1.11. Defrosting
1.11.1 Reverse defrosting
The defrost operation starts when the compressor operating time exceeds 20 minutes during heating operation, as shown below, and the outside air temperature and the outdoor unit heat exchanger tem­perature meet certain conditions. When the defrost operation starts, the indoor unit fan stops. The defrost operation stops when the out-
door unit heat exchanger temperature rises to about 13qC or higher or
the defrosting time exceeds 10 minutes.
1.12. ON timer
The ON timer can be activated by pressing the ON timer button. When the ON timer is activated, the operation start time is adjusted based on fuzzy logic calculations 1 hour before the set time so that the room temperature reaches the set temperature at the set time.
1.13. OFF timer
The OFF timer can be activated by pressing the OFF timer button. When the OFF timer is set, the operation stops after the set time.
When this timer is set, the compressor operating frequency lowers for quieter operation, and the room temperature is gradually varied after
one hour (reduced 1qC three times (max. 3qC) in heating, or increased
0.3qC three times (max. 1qC) in cooling or dehumidifying operation) so
that the room temperature remains suitable for comfortable sleeping.
1.14. Power ON start
If a jumper cable is inserted in the location marked with HAJP on the indoor unit control printed circuit board (control PCB), connecting the power cord to an AC outlet starts the air to air heat pump in either cool­ing or heating mode, which is determined automatically by the room temperature sensor.
When a circuit breaker is used to control the ON/OFF operation, please insert a jumper as described above.
1.15. Self-diagnostic malfunction code display
1.15.1 Indoor unit
1) When a malfunction is confirmed, a flashing malfunction code num­ber is displayed to indicate the type of malfunction.
When the air to air heat pump is in non-operating condition, holding down AUX button for more than 5 seconds activates the malfunc­tion code display function.
The operation continues only in the case of a serial open-circuit, and the main relay turns off after 30 seconds if the open-circuit con­dition remains.
In the case of a serial short-circuit, the air to air heat pump contin­ues operating without a malfunction code display.
The malfunction information is stored in memory, and can be recalled later and shown on display.
2) The self-diagnostic memory can be recalled and shown on the dis­play by stopping the operation and holding down AUX button for more than 5 seconds.
3) The content of self-diagnosis (malfunction mode) is indicated by a flashing number.
(For details, refer to the troubleshooting section.)
1.15.2 Outdoor unit
If a malfunction occurs, LED1 on the outdoor unit flashes in 0.2-sec­ond intervals as shown below.
1.16. Information about auto mode
In the AUTO mode, the temperature setting and mode are automati­cally selected according to the room temperature and outdoor temper­ature when the unit is turned on.
During operation, if the outdoor temperature changes, the temperature settings will automatically slide as shown in the chart.
20 min or more 20 min or more 20 min or more
Defrosting Max. 10 min
Defrosting Max. 10 min
Start of heating operation
Heating operation
Set temperature
Activation of OFF timer
1 hour later
Max.
1.5 hours later
Max. 2 hours later
Timer setting reached
1 hour later
Max.
1.5 hours later
Max. 2 hours later
Timer setting reached
Activation of OFF timer
Set temperature
-1
O
C
-1
O
C
-1OC
0.3
O
C
0.3
O
C
0.3
O
C
Cooling/dehumidifying operation
1 sec 1 sec 0.6 sec
ON
OFF
(Example) Compressor high temperature abnormality
Modes and Temperature Settings
the figures in ( ) are temperature settings
Page 15
12KHR-N
2 – 11
1.17. Adjusting the air flow direction
1.17.1 Vertical air flow direction
1.17.2 Horizontal air flow direction
1
Press the VERTICAL AIR FLOW button to set the desired air
flow direction.
AUTO mode
AUTO
obliquely downward
HEAT mode
AUTO
obliquely downward
downward
COOL/DRY mode
AUTO
obliquely upward obliquely downward
1
1
Press the HORIZONTAL AIR FLOW but­ton to set the desired air
flow direction
CAUTION:
Never attempt to adjust the open panel and the lou­vres manually.
• Manual adjustment of the open panel and the louvres can cause the unit to malfunction.
1
TIPS ABOUT AIR FLOW DIRECTION “AUTO“
COOL mode
The open panel will be set obliquely downward for 10 minutes, and then shift to obliquely upward to deliver cool air to the ceiling.
HEAT mode
The open panel will be set obliquely backward when outlet air tempera­ture is low, and then shift to obliquely downward when outlet air becomes war m .
DRY mode
The open panel will be set obliquely upward.
10 minutes later
When outlet air temperature is low
When outlet air becomes warm
Page 16
12KHR-N
2 – 12
1.18. Difference of operation in Auto and Manual modes
In the Auto mode, the temperature setting is automatically determined based on the outside air temperature. In addition, the air to air heat pump oper­ation differs from the operation in the Manual mode as explained below.
1.18.1 Difference relating to set temperature
1.19. Dehumidifying operation control
If the room temperature is 26qC or higher when dehumidifying opera-
tion starts, the dehumidifying operation provides a low cooling effect in accordance with the room temperature setting automatically deter­mined based on the outside air operation. (The setting value is the same as the set temperature for cooling operation in the auto mode.)
If the room temperature is lower than 26qC when dehumidifying opera-
tion starts, the dehumidifying operation minimizes the lowering of the room temperature.
1.20. Self Clean operation
Heating or Fan operation and Cluster operation are performed simulta­neously.
The judgment of whether Heating or Fan operation is used is based on the outside air temperature at 3 minutes after the start of internal cleaning.
The operation stops after 40 minutes. (The air to air heat pump shows
the remaining minutes: 40 o 39 o 38 ... 3 o 2 o 1)
1.21. Plasmacluster Ion function
The Plasmacluster lon generator inside the air conditioner will release positive and negative plasmacluster ions into the room. Approximately the same numbers of positive and negative ions released into the air will reduce some airborne mold.
During operation, press the PLASMACLUSTER button.
• The remote control will display “ “.
• The blue PLASMACLUSTER lamp on the unit will light up.
TO CANCEL
Press the PLASMACLUSTER button again.
• The PLASMACLUSTER lamp on the unit will turn off.
NOTE: • Use of the PLASMACLUSTER operation will be memo-
rized, and it will be activated the next time you turn on the air conditioner.
• To turn off the PLASMACLUSTER lamp, press the DIS­PLAY button.
• To perform the PLASMACLUSTER operation in FAN only mode, press the PLASMACLUSTER button while the unit is not operating. The mode symbol of the remote control will go off and the fan speed can not be set to AUTO.
1.22. Hot keep
If the room temperature is in the Hot keep zone during heating, the compressor is turned off to prevent overheating.
1.23. Winter cool
Cooling operation is available during the winter season by the built in winter cool function.
Lower limit of outdoor temperature range is -10qC DB.
When the outside air temperature is low, the outdoor unit fan operates at slower speed.
NOTE: Built-in protect device may work when outdoor temperature
falls below 21qC DB., depending on conditions.
1.24. 10qC OPERATION
Heating operation with 10qC set temperature will be performed.
1) Press the MODE button of Remote controller and select HEAT mode.
2) Press the ON / OFF button to start HEAT operation.
3) Press the 10qC button.
• The remote control will display 10qC.
TO CANCEL
Press the 10qC button again.
• 10qC operation will also be cancelled when the operation mode is
changed, or when the unit is turned off.
NOTE:
• 10qC operation will not be available with heating operation auto-
matically selected by AUTO mode.
1.25. Auto restart
When power failure occures, after power is recovered, the unit will automatically restart in the same setting which were active before the power failure.
1.25.1 Operating mode (Cool, Heat, Dry)
• Temperature adjustment (within 2qC range) automatic operation
• Temperature setting
• Fan setting
• Air flow direction
Auto mode Manual mode
Cooling Heating Dehumidifying Cooling Heating Dehumidifying
Temperature setting method
Automatic temperature setting based on outside air tem-
perature. Can be changed within r2qC using remote con-
trol.
Can be changed
between 18 and 32qC
using remote control.
Can be changed
between 18 and 32qC
using remote control.
Automatic setting. Can be changed
within r2qC.
Heating operation Fan operation
24OC
Outside air temperature
ZONE COM-
PRESSOR
FAN
Hot keep (When room temperature reaches setting tem­perature)
OFF
AUTO
Ultra soft
(Lower than Fan
speed “soft”)
SOFT LOW HIGH
Keep the setting
0.6OC
Set temperature
Hot keep zone ٕ
Page 17
12KHR-N
2 – 13
• Power ON/OFF
• Automatic operation mode setting
• Swing louvre
• Plasmacluster mode
1.25.2 Setting not memorized
• Timer setting
• Full power setting
• Internal cleaning
1.25.3 Disabling auto restart function
By removing (cutting) jumper 8 (JP8) on the printed circuit board (PCB), the auto restart function can be disabled.
2. Explanation of cluster circuit
The cluster unit generates cluster ions, which are circulated throughout the room by the air flow created by the blower fan (indoor unit fan motor) in the air to air heat pump unit.
1) When microcomputer output turns "H," the IC13 output changes to "Lo," turning ON the SSR1 and applying 100 V to the cluster unit for the gener­ation of cluster ions (positive and negative ions).
3. Outline of PAM circuit
3.1. PAM (Pulse Amplitude Modulation)
The PAM circuit varies the compressor drive voltage and controls the rotation speed of the compressor.
The IGBT shown in the block diagram charges the energy (electromotive force) generated by the reactor to the electrolytic capacitor for the inverter by turning ON and OFF.
When the IGBT is ON, an electric current flows to the IGBT via the reactor (L5) and diode bridge (DB2).
When the IGBT turns OFF, the energy stored while the IGBT was ON is charged to the voltage doubler capacitor via the diode bridge (DB1).
As such, by varying the ON/OFF duty of the IGBT, the output voltage is varied.
5
1
12V
SSR1
R16
R18
IC13
AC230V
Microcomputer output
4
1
Cluster unit
R19
R17
6
241
C5
PAM drive circuit block diagram
Reactor L5
[PAM drive circuit]
+
Microcomputer (IC1)
AC
230V
Compressor
Noise
filter
AC clock detection
circuit
DB1
IPM
DB2
Compressor
position detector
IGBT drive circuit
IGBT
Overvoltage
detection
circuit
Page 18
12KHR-N
2 – 14
3.2. High power factor control circuit
This circuit brings the operating current waveform closer to the waveform of commercial power supply voltage to maintain a high power factor.
Because of the capacitor input, when the PAM circuit is OFF, the phase of the current waveform deviates from the voltage waveform as shown below.
To prevent this deviation, a current is supplied during the periods indicated by "O" in the diagram.
To determine the length of period to supply a current, the zero-cross timing of the AC input voltage is input to the microcomputer via the clock circuit.
The power source frequency is also determined at the same time.
The IGBT turns ON after the time length determined by the zero-cross point to supply a current to the IGBT via the reactor.
This brings the current waveform closer to the voltage waveform in phase.
As described above, the ON/OFF operation of the IGBT controls the increase/decrease of the compressor power supply voltage (DC voltage) to improve the compressor efficiency and maintain a high power factor by keeping the current phase closer to that of the supply voltage.
3.2.1 Detailed explanation of PAM drive circuit sequence
3.2.2 AC clock (zero-cross) judgment
• The clock circuit determines the time from one rising point of the clock waveform to the next rising point.
The detected clock waveform is used to judge the power source frequency (50 Hz).
• The zero-cross of the AC voltage is judged as the rising of the clock waveform, as shown in the diagram above.
3.2.3 IGBT ON start time (delay time B)
• Based on the zero-cross of the AC voltage, the IGBT turns ON after a delay time set according to the power source frequency.
3.2.4 IGBT ON time (C)
• After the above delay time, the IGBT turns ON to supply a current to the reactor.
• The ON time of the IGBT determines the amount of energy (level of DC voltage rise) supplied to the reactor.
DC voltage level in each operation mode (varies depending on external load conditions)
– Cooling operation --- 260 to 280 V
– Heating operation --- 260 to 290 V
Stored energy
Reactor
L5
DB1
DB2
IGBT
IGBT ON
IGBT OFF
AC voltage waveform
AC voltage and current waveform when PAM is ON
AC current waveform
IGBT ON period
Zero-cross detection
AC voltage waveform
AC current waveform
AC voltage and current waveforms when PAM is OFF
AC voltage waveform
Clock
IGBT ON
A
B C
A
B
C
50Hz
1.2mS
1.0mS
0.25 2.3mS
Page 19
12KHR-N
2 – 15
3.3. PAM protection circuit
To prevent excessive voltage of PAM output from damaging the IPM and electrolytic capacitor as well as the control printed circuit board (PCB), this circuit monitors the PAM output voltage and turns off the PAM control signal and PAM drive immediately when an abnormal voltage output is generated. At the same time, it shuts off the compressor operation.
The PAM output voltage is distributed to pin (4) of the comparator (IC8). If this voltage exceeds the ref­erence voltage at pin (5) of the IC8, the output of the comparator (IC8) reverses (from H to L) and it is input to pin (38) of the microcomputer (IC1) to halt the PAM drive.
The protection voltage level is as follows.
3.3.1 Details of troubleshooting procedure for PAM
1) PAM shutdown due to error
1) When the DC voltage detection circuit sends a signal exceeding the specified voltage to the microcomputer
DC voltage of 400 V or higher (detection circuit input voltage of about 8.4 V or higher) [IC8 pin (4)]
– When an error is detected
• PAM IGBT turns OFF.
• Compressor turns OFF.
• All units shut down completely when the error occurs four times.
2) When the outdoor unit clock waveform differs from the specified value immediately before the PAM IGBT turns ON
When there is no clock waveform input
When a clock signal of other specified power source frequency (50 Hz) is input
– When an error is detected
• PAM IGBT does not turn ON.
• Compressor operates normally.
• Complete shutdown does not occur.
2) PAM error indication
In case of error “1)”
– An error signal is sent to the indoor unit as soon as an error is generated.
• Malfunction No. 14-0 is indicated when the error code is called out by the indoor unit's self-diagnosis function.
– The LED on the outdoor unit flashes 14 times when an error is generated.
• The LED continues flashing in the 14-time cycle even after the compressor stops operating.
• The LED turns off (data is deleted from the memory) when the outdoor unit power is turned off.
In case of error “2)”
– An error signal is sent to the indoor unit as soon as an error is judged.
• Malfunction No. 14-1 is indicated when the error code is called out by the indoor unit's self-diagnosis function.
– The LED on the outdoor unit flashes 14 times when an error is judged.
• The LED on the outdoor unit flashes in normal pattern when the compressor stops operating.
(Compressor OFF from remote control)
* When a user complains that the air to air heat pump does not provide sufficient cool air or warm air
In addition to conventional error-generating reasons, there is a possibility that the PAM IGBT does not turn ON even if the compressor is operating.
In that case, the DC voltage does not rise even though the compressor is operating.
– Check items
• Clock circuit check
• PAM IGBT check
• Fuse (Fu6) open-circuit check
R2 255K
C10C9
420V 750uF
R5 300K
R7
23.7KR823.7K
0V
0V
0V
IC8
15V
R113
19.1KF
R112 15K
R114 1M
5
4
2
(Overvoltage detection)
During abnormal voltage output
IC1
38
5V
R115
1.8K
R116 1K
Page 20
12KHR-N
2 – 16
4. Explanation of IPM drive circuit
The IPM for compressor drive is made by Mitsubishi Electric.
The power supply for the IPM drive and the shunt resistance for overcurrent detection, are provided outside the IPM.
4.1. IPM drive power supply circuit
The power supply for the upper-phase IGBT (HU, HV, HW) drive employs a bootstrap system, and provides power to the upper-phase IC.
The 15-V power supply for the lower-phase IC is provided by the control printed circuit board (PCB).
4.1.1 Brief explanation of bootstrap system (single power drive system)
To supply power to the upper-phase IC, the microcomputer (IC1) turns ON the lower-phase IGBT (LU, LV, LW).
This results in a charging current that flows to the electrolytic capacitor of each upper-phase IC input and charges the bootstrap capacitor with a 15-V current.
The power supply for the subsequent stages is charged while the lower-phase IGBT is ON in ordinary compressor drive control.
P(Vcc)
U,V,W,
V
D
V
DB
V
CIN(n
)
N-side IGBT
N(GND)
Bootstrap capacitor
High-voltage-withstanding, high-speed recovery diode
LVIC
(LU,LV,LW)
HVIC
(HU,HV,HW)
Bootstrap circuit
Initial charge period
Charging current group
Page 21
12KHR-N
2 – 17
4.1.2 DC overcurrent detection circuit
When a current of about 25 A or higher flows through the shunt resistance (R49) on the control printed circuit board (PCB), the voltage at this resis­tance is input to IPM CIN pin (15). Then, the gate voltage of the lower-phase IGBT (LU, LV, LW) inside the IPM turns OFF to cut off the overcurrent. At
the same time, an L output of more then 20Ps. is generated from IPM Fo pin (14), and this results in an L input to overcurrent detection input pin (34)
of the microcomputer (IC1) and turns OFF the PWM signal output (IC1 pins (51) through (56)) to the IGBT gate.
SET
RESET
(About 25 A)
SC
SC reference voltage
Delay by CR time constant circuit
More than 20ǴU
a1
Protection circuit status
Output current Ic (A)
Sense voltage relative to shunt resistance
Error output Fo
(Lower phase) Internal IGBT gate
IPM ov erc urr ent detection circuit
5V
0V
IC1
R49
Overcurrent
Shunt resistance
P
N
CiN
FO
14
15
34
51 ~ 56
IPM
Page 22
12KHR-N
2 – 18
5. 120q energizing control (digital position detection control)
This control system detects the digital position detection signal and adjusts the rate of acceleration/deceleration accordingly.
The motor's induced voltage waveform is input to the comparator in the form of PWM-switched pulse waveform, and a position detection signal is generated as a reference voltage equaling 1/2 of 280 VDC. However, since there is no induced voltage waveform when the PWM waveform is OFF, the microcomputer performs internal processing so that detection is enabled only when it is ON. Based on the detected position signal, actual PWM waveform output timing is determined. Since it does not use a filter circuit, the detection accuracy is high.
The microcomputer performs internal processing to cancel spike voltage during the regenerative process.
Furthermore, even if the induced voltage is low, position detection is still possible, thus allowing sensor-less operation at low rotation speed in the ini­tial stage of operation. This reduces the starting current and improves the IPM reliability.
6. 180q Energizing Control
This is the control system to moderate the speed by the current phase difference for higher efficiency and lower noise of the compressor. The current phase difference control is the control system paid attention to the interrelation between efficiency and phase gap generated by the applied voltage of motor and current in the coil of motor as shown in the figure below.
This control is the V/F drive system independent of the location of rotor, detecting the phase difference between driving voltage phase and line current phase flowing in motor coil, and controls the modulation rate data to get the phase difference at the best efficiency.
Comparator output waveform (Position signal waveform)
Terminal voltage waveform
Reference voltage (1/2 of DC voltage)
Spike voltage
(cancelled)
Ჷ(
ᲢᲣ
Motor voltage
Voltage /Current
phase difference
Motor current
Concept chart of the current phase difference control
Best timing
Difference of current and voltage peak
Efficiency
Page 23
12KHR-N
3 – 1
12KHR-N
5GTXKEG/CPWCN
CHAPTER 3. FUNCTION AND OPERATION OF PROTECTIVE PROCEDURES
[1] PROTECTION DEVICE FUNCTIONS AND OPERATIONS
Function Operation Self-diagnosis
result display
Description Detection period Reset condition Indoor
unit
error
display
Indoor
unit
Outdoor
unit
1 Indoor unit fan lock Operation stops if there is no
input of rotation pulse signal from indoor unit fan motor for 1 minute.
When indoor unit fan is in operation
Operation OFF or ON ✩2 Yes None
Indoor unit fan rota­tion speed error
Operation stops if rotation pulse signal from indoor unit fan indi­cates abnormally low speed (about 300 rpm or slower).
When indoor unit fan is in operation
Operation OFF or ON ✩2 Yes None
2 Indoor unit freeze
prevention
Compressor stops if temperature
remains below 0qC for 4 minutes.
When in cooling or dehumidifying opera­tion
Automatic reset when heat exchanger tem­perature rises above freeze prevention
temperature (2qC or
higher)
— None None
3 2-way valve freeze
prevention
Compressor stops if temperature of outdoor unit 2-way valve
remains below 0qC for 10 continu-
ous minutes during cooling or dehumidifying operation.
When in cooling or dehumidifying opera­tion
Automatic reset when temperature of 2-way valve rises above
10qC.
None Yes Yes
4 Indoor unit heat
exchanger over­heat shutdown
Operating frequency lowers if indoor unit heat exchanger tem­perature exceeds overheat tem­perature during heating operation. Compressor stops if indoor unit heat exchanger temperature exceeds overheat temperature for 60 seconds at minimum fre­quency. Overheat temperature setting value indoor unit heat exchanger thermistor temperature: about 45
to 54qC
When in heating operation
Automatic reset after safety period (180 sec).
None Yes Yes
5 Outdoor unit heat
exchanger over­heat shutdown
Operation frequency lowers if out­door unit heat exchanger temper-
ature exceeds about 55qC during
cooling operation. Compressor stops if outdoor unit heat exchanger temperature
exceeds about 55qC for 120 sec-
onds at minimum frequency.
When in cooling or dehumidifying opera­tion
Automatic reset after safety period (180 sec).
None Yes Yes
6 Compressor dis-
charge overheat shutdown
Operating frequency lowers if temperature of compressor chamber thermistor (TH1) falls
below about 110qC.
Compressor stops if temperature of compressor chamber ther­mistor (TH1) remains at about
110qC (for 120 seconds in cooling
operation, or 60 seconds in heat­ing operation) at minimum fre­quency.
When compressor is in operation
Automatic reset after safety period (180 sec).
None Yes Yes
7 Dehumidifying oper-
ation temporary stop
Compressor stops if outside air temperature thermistor is lower
than about 16qC during dehumidi-
fying operation.
When in dehumidify­ing operation
Automatic reset when outside air tempera­ture rises above
16qC.
None Yes Yes
8 DC overcurrent
error
Compressor stops if DC current of about 25 A or higher flows in IPM.
When compressor is in operation
Operation OFF or ON Yes ✩1 Yes Yes
Page 24
12KHR-N
3 – 2
9 AC overcurrent
error
Operating frequency lowers if out­door AC current exceeds peak control current value. outdoor stops if compressor AC current exceeds peak control current value at minimum frequency.
When compressor is in operation
Operation OFF or ON Yes ✩1 Yes Yes
10 AC overcurrent
error in compressor OFF status
Indoor and outdoor units stop if outdoor AC current exceeds about 3 A while compressor is in non-operation status.
When compressor is in non-operation
Replacement of defective parts such as IPM
Yes ✩2 Yes Yes
11 AC maximum cur-
rent error
Compressor stops if coutdoor AC current exceeds 17 A.
When compressor is in operation
Operation OFF or ON Yes ✩1 Yes Yes
12 AC current defi-
ciency error
Compressor stops if operating frequency is 50 Hz or higher and outdoor AC current is about 2.0 A or lower.
When compressor is in operation
Operation OFF or ON Yes ✩1 Yes Yes
13 Thermistor installa-
tion error or 4-way valve error
Compressor stops if high and low values of temperatures detected by outdoor unit heat exchanger thermistor (TH2) and 2-way valve thermistor (TH5) do not match operating cycle.
3 minutes after com­pressor startup
Operation OFF or ON Yes ✩1 Yes Yes
14 Compressor high
temperature error
Compressor stops if compressor chamber thermistor (TH1)
exceeds about 114qC, or if there
is short-circuit in TH1.
When in operation Operation OFF or ON Yes ✩1 Yes Yes
15 Outdoor unit heat
exchanger ther­mistor short-circuit error
Compressor stops if there is short-circuit in outdoor unit heat exchanger thermistor (TH2).
At compressor star­tup
Operation OFF or ON Yes ✩1 Yes Yes
16 Outdoor unit outside
air temperature thermistor short-cir­cuit error
Compressor stops if there is short-circuit in outdoor unit out­side air temperature thermistor (TH3).
At compressor star­tup
Operation OFF or ON Yes ✩1 Yes Yes
17 Outdoor unit suction
thermistor short-cir­cuit error
Compressor stops if there is short-circuit in outdoor unit suc­tion thermistor (TH4).
At compressor star­tup
Operation OFF or ON Yes ✩1 Yes Yes
18 Outdoor unit 2-way
valve thermistor short-circuit error
Compressor stops if there is short-circuit in outdoor unit 2-way valve thermistor (TH5).
At compressor star­tup
Operation OFF or ON Yes ✩1 Yes Yes
19 Outdoor unit heat
exchanger ther­mistor open-circuit error
Compressor stops if there is open-circuit in outdoor unit heat exchanger thermistor (TH2).
At compressor star­tup
Operation OFF or ON Yes ✩1 Yes Yes
20 Outdoor unit outside
air temperature thermistor open-cir­cuit error
Compressor stops if there is open-circuit in outdoor unit out­side air temperature thermistor (TH3).
At compressor star­tup
Operation OFF or ON Yes ✩1 Yes Yes
21 Outdoor unit suction
thermistor open-cir­cuit error
Compressor stops if there is open-circuit in outdoor unit suc­tion thermistor (TH4).
At compressor star­tup
Operation OFF or ON Yes ✩1 Yes Yes
22 Outdoor unit 2-way
valve thermistor open-circuit error
Compressor stops if there is open-circuit in outdoor unit 2-way valve thermistor (TH5).
At compressor star­tup
Operation OFF or ON Yes ✩1 Yes Yes
23 Outdoor unit dis-
charge thermistor open-circuit error
Compressor stops if there is open-circuit in outdoor unit dis­charge thermistor (TH1).
At compressor star­tup
Operation OFF or ON Yes ✩1 Yes Yes
24 Serial signal error Compressor stops if outdoor unit
cannot receive serial signal from indoor unit for 30 seconds.
When in operation Reset after reception
of serial signal
None None None
25 Compressor star-
tup error
Compressor stops if compressor fails to start up.
At compressor star­tup
Operation OFF or ON Yes ✩3 Yes Yes
Function Operation Self-diagnosis
result display
Description Detection period Reset condition Indoor
unit
error
display
Indoor
unit
Outdoor
unit
Page 25
12KHR-N
3 – 3
✩1—The outdoor unit restarts four times before the indoor unit error is displayed (complete shutdown).
✩2—A single error judgment results in the display of the indoor unit error (complete shutdown).
✩3—The outdoor unit restarts eight times before the indoor unit error is displayed (complete shutdown).
[2] AIR TO AIR HEAT PUMP OPERATION IN THERMISTOR ERROR
1. Indoor unit
26 Compressor rota-
tion error (at 120q
energizing)
Compressor stops if there is no input of position detection signal from compressor or input is abnormal.
Compressor operat-
ing at 120q energizing
Operation OFF or ON Yes ✩3 Yes Yes
27 Outdoor unit DC fan
error
Operation stops if there is no input of rotation pulse signal from outdoor unit fan motor for 30 sec­onds.
When outdoor unit fan is in operation
Operation OFF or ON Yes ✩1 Yes Yes
28 PAM overvoltage
error
Compressor stops if DC voltage is 400 V or higher.
When in operation Operation OFF or ON Yes ✩1 Yes Yes
29 PAM clock error When power source frequency
cannot be determined (at startup), or when power source clock can­not be detected for 1 continuous second (at startup).
At compressor star­tup, when in opera­tion
Compressor contin­ues operation with­out stopping.
None Yes Yes
Item Mode Control opera-
tion
When resis-
tance is low
(temperature
judged higher
than actual)
Short-circuit When resis-
tance is high (temperature judged lower
than actual)
Open-circuit
Room tempera­ture thermistor (TH1)
Auto Operation mode
judgment
Cooling mode is activated even if room tempera­ture is low.
Cooling mode is activated in most cases.
Heating mode is activated even if room tempera­ture is high.
Heating mode is always activated.
Cooling Frequency control Room becomes
too cold.
Air conditioner operates in full power even when set temperature is reached.
Room does not become cool.
Compressor does not operate.
Dehumidifying Room tempera-
ture memory Frequency control
Normal operation. Room tempera-
ture is stored in memory as
31.0qC, and com-
pressor does not stop.
Normal operation. Room tempera-
ture is stored in memory as
18.5qC, and com-
pressor does not operate.
Heating Frequency control Room does not
become warm.
Hot keep status results immedi­ately after opera­tion starts. Frequency does not increase above 30 Hz (40 Hz).
Room becomes too warm.
Air conditioner operates in full power even when set temperature is reached.
Heat exchanger thermistor (TH2)
Cooling Dehumidifying
Freeze preven­tion
Indoor unit evap­orator may freeze.
Indoor unit evap­orator may freeze.
Compressor stops occasion­ally.
Compressor does not operate.
Heating Cold air preven-
tion
Cold air preven­tion deactivates too soon and cold air discharges.
Compressor operates at low speed or stops, and frequency does not increase.
Cold air preven­tion deactivates too slow.
Cold air preven­tion does not deactivate, and indoor unit fan does not rotate.
Function Operation Self-diagnosis
result display
Description Detection period Reset condition Indoor
unit
error
display
Indoor
unit
Outdoor
unit
Page 26
12KHR-N
3 – 4
2. Outdoor unit
Item Mode Control opera-
tion
When resis-
tance is low
(temperature
judged higher
than actual)
Short-circuit When resis-
tance is high (temperature judged lower
than actual)
Open-circuit
Compressor chamber ther­mistor (TH1)
Cooling Dehumidifying Heating
Expansion valve control and com­pressor protection
Compressor operates, but room does not become cool or warm (expansion valve is open).
Compressor high temperature error indication.
Layer short-cir­cuit or open-cir­cuit may result in compressor in normal operation.
Outdoor unit ther­mistor open-cir­cuit error indication.
Heat exchanger thermistor (TH2)
Cooling Dehumidifying
Outdoor unit heat exchanger over­heat prevention
Compressor operates at low speed or stops.
Outdoor unit ther­mistor short-cir­cuit error indication.
Normal operation. Outdoor unit ther-
mistor open-cir­cuit error indication.
Heating Expansion valve
control Defrosting
Defrosting opera­tion is not acti­vated as needed, and frost accumu­lates on outdoor unit (expansion valve is closed).
Outdoor unit ther­mistor short-cir­cuit error indication.
Defrosting opera­tion is activated unnecessarily, and room does not become warm (expansion valve is open).
Outdoor unit ther­mistor open-cir­cuit error indication.
Outside air tem­perature ther­mistor (TH3)
Auto Operation mode
judgment
Cooling mode is activated even if room tempera­ture is low.
Outdoor unit ther­mistor short-cir­cuit error indication.
Heating mode is activated even if room tempera­ture is high.
Outdoor unit ther­mistor open-cir­cuit error
indication. Cooling Dehumidifying
Operation not affected
Normal operation. Outdoor unit ther-
mistor short-cir­cuit error indication.
Normal operation. Outdoor unit ther-
mistor open-cir-
cuit error
indication. Heating Rating control
Defrosting
Defrosting opera­tion is activated unnecessarily.
Outdoor unit ther­mistor short-cir­cuit error indication.
Defrosting opera­tion is not acti­vated, and frost accumulates on outdoor unit.
Outdoor unit ther-
mistor open-cir-
cuit error
indication.
Suction pipe ther­mistor (TH4)
Cooling Dehumidifying
Expansion valve control
Compressor operates, but room does not become cool (expansion valve is open).
Outdoor unit ther­mistor short-cir­cuit error indication.
Frost accumu­lates on evapora­tor inlet section, and room does not become cool (expansion valve is closed).
Outdoor unit ther-
mistor open-cir-
cuit error
indication.
Heating Expansion valve
control
Compressor operates, but room does not become warm (expansion valve is open).
Outdoor unit ther­mistor short-cir­cuit error indication.
Frost accumu­lates on expan­sion valve outlet section, and room does not become warm (expansion valve is closed).
Outdoor unit ther-
mistor open-cir-
cuit error
indication.
2-way valve ther­mistor (TH5)
Cooling Dehumidifying
Expansion valve control
Frost accumu­lates on indoor unit evaporator and room does not become cool (expansion valve is closed).
Outdoor unit ther­mistor short-cir­cuit error indication.
Compressor operates, but room does not become cool (expansion valve is open).
Outdoor unit ther-
mistor open-cir-
cuit error
indication.
Heating Operation not
affected
Normal operation. Outdoor unit ther-
mistor short-cir­cuit error indication.
Normal operation. Outdoor unit ther-
mistor open-cir-
cuit error
indication.
Page 27
12KHR-N
3 – 5
[3] THERMISTOR TEMPERATURE CHARACTERISTICS
1. Indoor unit thermistor temperature characteristics
2. Outdoor unit thermistor temperature characteristics
100
80
60
40
20
0
-10 0 10 20 30 40
Resistance
Thermistor Room temperature Heat exchange
Color
Yellow
Orange
Room temperature thermistor TH1 (CN10 1 - 3 ) Heat exchange thermistor TH2 (CN11 1 - 2 )
Tester
CN10
1
3
Signal TH1 TH2
Figure 1 Temperature properties of indoor thermistors
k
To measure the resistance, first remove the soldering as shown at right.
Room temperature thermistor TH1 (Yellow) 25ºC resistance 10 k
Heat exchange thermistor TH2 (Orange), 25ºC resistance 4.431 k
TH1
Tester
CN11
1
2
TH2
+
-
TH2 TH5
500K
400K
300K
200K
100K
0
-20 0 20 60 80 100 120
Tester
1 10
Connector CN8
Resistance at 25
52.76 k
5.8K
40K
30K
20K
0
10K
-20 0 20 6040
3.06K
4.17K
1.72K
2.28K
+
-
Tester
(In case of TH2 heat exchanger thermistor)
1 10
Connector CN8
Thermistor
Compressor thermistor
Heat exchanger thermistor
Outdoor air temperature thermistor
Suction thermistor
2-way valve thermistor
No.
TH1
TH2
TH3
TH4
TH5
Connector
No. (1) - No. (2)
No. (3) - No. (4)
No. (5) - No. (6)
No. (7) - No. (8)
No. (9) - No. (10)
Color
Red
Orange
Green
Black
Yellow
TH1 Compressor thermistor
TH2 Heat exchanger thermistor TH3 Outdoor air temperature thermistor TH4 Suction thermistor TH5 2-way valve thermistor
Resistance
(K )
Resistance
(K )
Temperature( )
Temperature( )
Resistance at 0
14.57 k
Resistance at 25
4.431 k
Before measuring resistance,
disconnect connectors from PWB.
Page 28
12KHR-N
3 – 6
[4] HOW TO OPERATE THE OUTDOOR UNIT INDEPENDENTLY
1. Cooling in 40 Hz fixed mode
To operate the outdoor unit independently, short-circuit the sections indicated by arrows in the diagram below with an adapter, and apply 220-240 VAC between (1) and (N) on the terminal board of the outdoor unit. This allows the outdoor unit to be operated in cooling mode independently.
(Do not operate the outdoor unit in this condition for an extended period of time.)
[5] GENERAL TROUBLESHOOTING CHART
1. Indoor unit does not turn on
2. Indoor unit fan does not operate
3. Indoor unit fan speed does not change
4. Remote control signal is not received
Main cause Inspection method Normal value/condition Remedy
Cracked PWB. (Cracked pattern)
Check visually. There should be no cracking in
PWB or pattern.
Replace PWB.
Open-circuit in FU1 (250 V, 3.15 A)
Check melting of FU1. There should be no open-circuit. Replace PWB.
Main cause Inspection method Normal value/condition Remedy
Open-circuit in heat exchanger thermistor (TH2) (in heating oper­ation)
Measure thermistor resistance (dismount for check).
-1 Replace thermistor. There should be no open-circuit or faulty contact.
Replace thermistor.
Disconnected heat exchanger thermistor (TH2) (in heating oper­ation)
Inspect connector on PWB. Check thermistor installation con­dition.
Thermistor should not be discon­nected.
Install correctly.
Main cause Inspection method Normal value/condition Remedy
Remote control is not designed to allow fan speed change in several operation mode.
Check operation mode. Fan speed should change except
during dehumidifying operation, ventilation, light dehumidifying operation, internally normal oper­ation
Explain to user.
Main cause Inspection method Normal value/condition Remedy
Batteries at end of service life. Measure battery voltage. 2.5 V or higher (two batteries in
series connection)
Install new batteries.
Batteries installed incorrectly. Check battery direction. As indicated on battery compart-
ment.
Install batteries in indicated direc-
tion. Lighting fixture is too close, or Fluorescent lamp is flickering in the room.
Turn off light and check. Signal should be received when
light is turned off.
Change light position or install
new fluorescent lamp.
Sevick light (Hitachi) is used in the room.
Check room lights. Signal may not be received
sometimes due to effect of Sevick light.
Replace light or change position.
Operating position/angle are inappropriate.
Operate within range specified in manual.
Signal should be received within range specified in manual.
Explain appropriate handling to
user. Open-circuit or short-circuit in wir­ing of light receiving section.
Check if wires of light receiving section are caught.
Wires of light receiving section should not have any damage caused by pinching.
Replace wires of light receiving
section.
Light receiving unit is defective Check signal receiving circuit
(measure voltage between termi­nals 8 and 10, 9 and 10 of con­nector CN17).
Tester indicator should move when signal is received.
Replace PWB.
(L2)
C9C10
Connect with IC clip Test mode cooling at 40 Hz
Connect with IC clip Test mode cooling at 40 Hz
Short-circuit negative terminal of capacitor (C33) - and jumper wire (JP16) using IC clip, etc.
Page 29
12KHR-N
3 – 7
5. Louvers do not move
6. There is noise in TV/radio
7. Malfunction occurs
8. Compressor does not start
9. Operation stops after a few minutes and restarts, and this process repeats
CAUTION: If fuse FU1/FU4/FU5 (outdoor unit control circuit board) is blown, be careful of charging voltage in inverter electrolytic capacitor C9, C10.
To discharge stored electricity, unplug the power cord and connect the plug of a soldering iron (230VAC, 50W) between the positive and negative terminals of inverter electrolytic capacitor C9, C10.
Dew condensation on light receiv­ing unit.
Check for water and rust. Signal should be received within
range specified in manual.
Take moisture-proof measure for
lead wire outlet of light receiving
section.
Main cause Inspection method Normal value/condition Remedy
Caught in sliding section. Operate to see if louvers are
caught in place.
Louvers should operate smoothly. Remove or correct catching sec-
tion. Disconnected connector (CN13, CN16, CN19) on relay PWB, lou­ver motor side)
Inspect connectors. Connectors or pins should not be
disconnected.
Install correctly.
Contact of solder on PWB (connector section on PWB)
Check visually. There should not be solder con-
tact.
Correct contacting section.
Main cause Inspection method Normal value/condition Remedy
Grounding wires not connected properly.
Check grounding wire connec­tions.
Grounding wires should be con­nected properly.
Connect grounding wires prop-
erly. TV/radio is placed too close to outdoor unit.
Check distance between TV/radio and outdoor unit.
If TV/radio is placed too close, it may become affected by noise.
Move TV/radio away from outdoor
unit. Other than above. Check for radio wave interfer-
ence.
Main cause Inspection method Normal value/condition Remedy
Malfunction caused by noise. Check for radio wave interfer-
ence.
Main cause Inspection method Normal value/condition Remedy
Erroneous inter-unit connection. Check wiring between indoor and
outdoor units.
Terminal board 1-N: 220-240 VAC, 50 Hz Terminal board 2: serial signal
Correct wiring.
Damaged IPM. Check IPM continuity. See [IPM check method] on page
3-10
Replace IPM.
Dried-up electrolytic capacitor. Check electrolytic capacitor. See [Inverter electrolytic capaci-
tor (C9,C10) check method] on page 3-9
Replace electrolytic capacitor.
Blown outdoor unit fuse. Check 20A fuse.
Check 15A fuse.
Fuse should not be blown. Replace fuse/diode bridge.
Replace fuse.
Replace outdoor unit PWB
assembly. Power supply voltage is too low. Measure power supply voltage
during startup.
230r10 VAC, 50 Hz Make sure that power supply volt-
age is 200 V or higher. Compressor lock. Supply current and touch com-
pressor cover (sound absorbing material) to check if operation starts.
Compressor should start nor­mally.
Apply external impact to com-
pressor.
Replace compressor.
xTemp. fuse of terminal is error
xEEEPROM error
xAC Over current error
See (Diagnosis Function and dis­play mode) on page 3-13
Malfunction display section (0-0) Compressor should start nor­mally.
xReplace terminal
xReplace outdoor unit PWB
xReplace outdoor unit PWB
Main cause Inspection method Normal value/condition Remedy
Dried-up electrolytic capacitor. Measure 320VDC line voltage. 300 V or higher. Replace electrolytic capacitor. Layer short-circuit in expansion valve coil.
Measure resistance. 46r3: in each phase (at 20qC) Replace coil.
Main cause Inspection method Normal value/condition Remedy
Page 30
12KHR-N
3 – 8
[6] MALFUNCTION (PARTS) CHECK METHOD
1. Procedure for determining defective outdoor unit IPM/compressor
The following flow chart shows a procedure for locating the cause of a malfunction when the compressor does not start up and a DC overcurrent indi­cation error occurs.
CAUTION: Please take care for electrical shock when you work to change defective parts or disconnect wires of defective application.
The outdoor unit has energy changed for a while even after unplugging the power supply cord.
After changing the part or unit, please retry check procedure from the beginning.
YES
Immediately after startup
YES
YES
NO
NO
NO
YES
NO
Connect power cord
to AC outlet.
Normal
Using remote control, operate air conditioner so th at co mpre ssor starts.
Check 220-24 0 VAC between (1) and (N) on outdoor unit PWB.
Is LED1 on outdoor
unit flashing?
Compressor starts up.
Does LED 1 indicate DC overcurrent error?
Does LED 1 indicate rotation error?
Replace compressor.
Does LED1 remain lit?
Serial signal error. Check inter-unit wiring. Check indoor and outdoor unit PWBs.
Replace outdoor unit PWB. Check compressor. 2/3-way valve closed. Refrigerant shortage.
Replace outdoor unit PWB.
Check 320 VDC between pins IPM (20) and (24)?
LED1 is flashing.
Replace outdoor unit PWB.
Replace expansion valve.
Disconn ect (CN3) lead wires of FAN motor.
Disconnect (CN12) expansion valve.
Replace outdoor unit PWB.
YES
NO
YES
NO
NO
YES
YES
No
(unlit)
FUSE and+12 V, +15 V,
+18V on PWB
(LED1 is still off)
Replace outdoor unit PWB.
Replace FAN motor.
LED1 is flashing.
YES
NO
Page 31
12KHR-N
3 – 9
2. Procedure for determining defective expansion valve
3. Diode bridge check method
Turn off the power and let the inverter electrolytic capacitor (C9, C10) discharge completely. Then use a tester and check continuity.
When using a digital tester, the (+) and (-) tester lead wires in the table must be reversed.
4. Inverter electrolytic capacitor (C9, C10) check method
Turn off the power, let the inverter electrolytic capacitor (C9, C10) discharge completely, and remove the capacitor from the control printed circuit board (PWB). First, check the case for cracks, deformation and other damages. Then, using a needle-type tester, check continuity.
Determination of normal condition
The tester needle should move on the scale and slowly returns to the original position. The tester needle should move in the same way when polarities are reversed. (When measurement is taken with the polarities reversed, the tester needle exceeds the scale range. Therefore, let the capacitor discharge before measurement.)
Measure resistance in expansion valve coil.
Normal resistance between red
terminal of expansion valve
lead wire and each terminal:
about 46 (at 20 )
Insert checker shown at left into connector (CN12) on control PWB, and operate air conditioner.
If frost accumulates on 2-way valve after 10 to 20
minutes of cooling operation, then thermistors with
yellow and black lead wires may be defective. Check
these thermistors.
4GRNCEGVJGTOKUVQTCUUGODN[
Replace control PWB.
4GRNCEGGZRCPUKQP
XCNXGCUUGODN[
NO
NO
YES
YES
&GHGEVKXGVJGTOKUVQT
6JGTOKUVQTUKP
PQTOCNEQPFKVKQP
Checker
LED (red)
Connector
J.S.T. XAP-06V-1
Terminal
SXA-001T-P0.6
4
3 2
1
5
6
5.6K
5.6K
5.6K
5.6K
Do LEDs on checker light in orderly sequence (lighting of 1 LED => lighting of 2 LEDs)
4 5 B
Needle-type tester
Normal resistance value
(several M )
Value in ( ) is for digital tester.
Page 32
12KHR-N
3 – 10
5. IPM check method
Turn off the power, let the large capacity electrolytic capacitor (C10) discharge completely, and dismount the IPM. Then, using a tester, check leak current between C and E.
When using a digital tester, the (+) and (-) tester lead wires in the table must be reversed.
Values in ( ) are for digital tester.
5.1. IPM internal circuit diagram
[7] OUTDOOR UNIT CHECK METHOD
After repairing the outdoor unit, conduct the following inspection procedures to make sure that it has been repaired completely. Then, operate the compressor for a final operation check.
Needle-type tester Normal resistance value
(-) (+)
P N f
(several M:)
U V W
Needle-type tester Normal resistance value
(-) (+)
U N f
(several M:)
V W
YES
Immediately after startup
YES
YES
NO
NO
NO
YES
NO
Connect power cord
to AC outlet.
Normal
Using remote control, operate air conditioner so th at co mpre ssor starts.
Check 220-24 0 VAC between (1) and (N) on outdoor unit PWB.
Is LED1 on outdoor
unit flashing?
Compressor starts up.
Does LED 1 indicate DC overcurrent error?
Does LED 1 indicate rotation error?
Replace compressor.
Does LED1 remain lit?
Serial signal error. Check inter-unit wiring. Check indoor and outdoor unit PWBs.
Replace outdoor unit PWB. Check compressor. 2/3-way valve closed. Refrigerant shortage.
Replace outdoor unit PWB.
Check 320 VDC between pins IPM (20) and (24)?
LED1 is flashing.
Replace outdoor unit PWB.
Replace expansion valve.
Disconn ect (CN3) lead wires of FAN motor.
Disconnect (CN12) expansion valve.
Replace outdoor unit PWB.
YES
NO
YES
NO
NO
YES
YES
No
(unlit)
FUSE and+12 V, +15 V,
+18V on PWB
(LED1 is still off)
Replace outdoor unit PWB.
Replace FAN motor.
LED1 is flashing.
YES
NO
Page 33
12KHR-N
3 – 11
1. Checking procedures
No
.
Item Check method Normal value/condition Remedy
1 Preparation Disconnect compressor cords (white,
orange, red: 3 wires) from compres­sor terminals, and connect simulated load (lamp used as load). Operate air conditioner in cooling or heating test operation mode.
2 Inverter DC power supply
voltage check
Measure DC voltage between IPM pins (20) and (24).
320 VDC Replace control PWB.
Replace diode bridge. Correct soldered section of Fas­ten tabs (BT1,2,5,6,10,11, JPL1,2,5,6) on control PWB. (Repair solder cracks.)
3 IPM circuit check Check that 3 lamps (load) light.
Check position detection voltage (+15 V, 5 V) on control PWB.
Each voltage should be normal. All 3 lamps (load) should light with same intensity.
Replace control PWB.
4 Compressor check Measure compressor coil resistance
(for each phase of U, V and W). Use multi-meter or digital tester capa­ble of displaying two digits right of the
decimal point (0.01:).
Resistance value at 20qC --- 0.65:Correct connections at compres-
sor terminals. Replace compressor.
5 Expansion valve check Measure expansion valve coil resis-
tance.
Each phase 46r3: (at 20qC) Replace expansion valve.
6 Final check Turn off power, and connect compres-
sor cords to compressor. Operate air conditioner. Measure DC voltage between IPM pins (20) and (24).
Compressor should operate nor­mally. 320 VDC or higher.
Replace control PWB. Replace outdoor unit thermistor. Replace compressor (in case of compressor lock).
Page 34
12KHR-N
3 – 12
2. Troubleshooting of outdoor unit electric components
Does LED light?
NO
YES
NO
Does LED flash?
Normal
NO
YES
YES
NO
YES
NO
YES
Check 320VDC between IPM pins (20) and (24) ?
Short-circuit in DC fan motor Short-circuit in IPM Short-circuit in diode bridge Blown fuse Defective electrolytic capacitor Wire disconnection, PWB pattern damage Short-circuit in PAM IGBT (Q5)
Defective switching power supply circuit Malfunction of 3-terminal regulator IC4, IC1 Short-circuit in expansion valve coil Malfunction of transistor array IC7 Solder contact or other problems
Malfunction of 3-terminal regulator IC4, IC1
Microcomputer oscillator error Malfunction of microcomputer reset IC Malfunction of microcomputer
Malfunction of serial signal circuit Check wiring between indoor and outdoor units.
Check switching power supply output of 12 VDC, 15 VDC ?
Check 5 VDC output ?
Check 220-240VAC input voltage.
Page 35
12KHR-N
3 – 13
3. Caution in checking printed circuit boards (PWB)
3.1. Non-insulated control circuit
The GND terminals of the low-voltage circuits (control circuits for microcomputer and thermistors and drive circuits for expansion valve and relays) on the control printed circuit board (PWB) are connected to the compressor drive power supply (320-VDC negative terminal). Therefore, exercise utmost caution to prevent electric shock.
If a measuring instrument used for the test is grounded, its chassis (ground) has the same electric potential as the 0-V probe. Since non-insulated cir­cuits have the following voltage potential difference from the ground, connection of the grounding wire results in a short-circuit between the 0-V line and the ground, thus allowing an excessive current to flow to the tester to cause damage.
If the sheaths of the thermistor lead wires or expansion valve lead wires inside the outdoor unit become damaged due to pinching by the front panel or other metal parts or contacting a pipe, a high voltage can flow and destroy the circuits. To prevent these problems, carefully conduct assembly work.
Terminal board
Ground
0-V line
Point (F)
Point (E)
Reactor
IPM
+
-
Compressor motor
2
AC230V
1
N
Outdoor unit circuits
M
Reason
The oscilloscope (chassis ground) has the same electric potential as the 0-V probe. The entire electronic control section of the outdoor unit has a voltage potential difference from the ground as shown in the above diagram. When the oscilloscope is set up, the 0-V line and the ground voltage (ground) will be short-circuited, resulting in an excessive current flow to cause damage to the oscilloscope or indoor electric circuits.
Do not touch the cabinet or bring metal parts into contact with the cabinet.
Danger!! Do not connect the grounding wire.
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