Download Mitsubishi Electric KA12 Service manual

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
July 2011
No.OCH467
REVISED EDITION-A
HFC
utilized
R410A
SERVICE MANUAL
R410A
Outdoor unit
[Model names]
SUZ-KA09NA
SUZ-KA12NA
SUZ-KA15NA
SUZ-KA18NA
[Service Ref.]
SUZ-KA09NA.TH
SUZ-KA12NA.TH
SUZ-KA15NA.TH
SUZ-KA18NA.TH
Revision:
• SLZ-KA·NA models have been
added as connectable indoor units.
• Some descriptions have been modified.
• Please void OCH467.
Note:
This service manual describes service data of the outdoor units.
• RoHS compliant products have
<G> mark on the spec name plate.
CONTENTS
SUZ-KA18NA.TH
1. COMBINATION OF INDOOR AND OUTDOOR UNITS...2
2. PART NAMES AND FUNCTIONS......................2
3. SPECIFICATION.................................................3
4. OUTLINES AND DIMENSIONS..........................4
5. WIRING DIAGRAM............................................ 5
6. REFRIGERANT SYSTEM DIAGRAM................8
7. DATA.................................................................11
8. ACTUATOR CONTROL....................................13
9. SERVICE FUNCTION.......................................14
10. TROUBLESHOOTING......................................14
11. FUNCTION SETTING.......................................30
12. DISASSEMBLY INSTRUCTIONS.....................33
PARTS CATALOG (OCB467)
1
COMBINATION OF INDOOR AND OUTDOOR UNITS
Outdoor unit
Heat pump type
Indoor unit
Service Ref.
Service
Manual No.
SUZKA09NA.TH
KA12NA.TH KA15NA.TH
Heat pump without
electric heater
SEZ-KD09NA4.TH
SEZ-KD12NA4.TH
SEZ-KD15NA4.TH
HWE08020
SEZ-KD18NA4.TH
SLZ-KA09NA.TH
SLZ-KA12NA.TH
SLZ-KA15NA.TH
2
—
OCH487
OCB487
—
OUTDOOR UNIT
SUZ-KA12NA
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
SUZ-KA15NA
Air inlet
(back and side)
Piping
Drain hose
Air outlet
Drain outlet
SUZ-KA18NA
OUTDOOR UNIT
—
—
PART NAMES AND FUNCTIONS
SUZ-KA09NA
KA18NA.TH
Air inlet
(back and side)
Piping
Drain hose
Air outlet
Drain outlet
—
—
3
SPECIFICATION
Outdoor unit model
Power supply
Max. fuse size (time delay)
Min. circuit ampacity
Fan motor
Model
SUZ-KA09NA
SUZ-KA12NA
SUZ-KA15NA
SUZ-KA15NA
208/230 , 1 , 60
15
12
12
12
14
0.50
0.93
KNB073FQDHC KNB092FQAHC
SNB130FQBH
R.L.A
6.6
6.6
7.4
10.0
Compressor
L.R.A
8.2
8.2
9.3
12.5
Refrigeration oil oz. (Model)
10.8 (NEO22)
15.2 (NEO22)
Refrigerant control
Linear expansion valve
Cooling
dB(A)
46
49
49
54
Sound level 1
Heating
dB(A)
50
51
51
56
Defrost method
Reverse cycle
W
in.
31-1/2
33-1/16
D
in.
11-1/4
13
Dimensions
H
in.
21-5/8
33-7/16
Weight
Ib.
66
77
80
119
External finish
Munsell 3Y 7.8/1.1
Control voltage (by built-in transformer)
VDC
12 - 24
Refrigerant piping
Not supplied
in.
1/4 (0.0315)
Refrigerant pipe size Liquid
(Min. wall thickness) Gas
in.
3/8 (0.0315)
1/2 (0.0315)
Indoor
Flared
Connection method
Outdoor
Flared
ft.
40
50
Between the indoor & Height difference
outdoor units
Piping length
ft.
65
100
Refrigerant charge (R410A)
1 lb. 16 oz.
2 lb. 9 oz.
3 lb. 16 oz.
V , phase , Hz
A
A
F.L.A
NOTE: Test conditions are based on AHRI 210/240.
1: Rating conditions (Cooling) — Indoor: 80˚FDB, 67˚FWB, Outdoor: 95˚FDB, (75˚FWB)
(Heating) — Indoor: 70˚FDB, 60˚FWB, Outdoor: 47˚FDB, 43˚FWB
OPERATING RANGE
(1) POWER SUPPLY
Rated voltage
Outdoor unit
208/230 V
1 phase
60 Hz
Guaranteed voltage (V)
Min. 187
208
230
Max. 253
4
OUTLINES AND DIMENSIONS
SUZ-KA09NA
SUZ-KA12NA
SUZ-KA15NA
Unit: inch
REQUIRED SPACE
11/16
Air in
. or
4 in
4 in
. or
2- 3/8
7/8
re
13/16 Oval hole
29/32
11-1/4
8
17/32
rm
in. o
5-7/8
2
Liquid pipe
Gas pipe
11-29/32
5-15/16
or m
ore
:1/4 (flared)
:3/8 (flared) (KA09/12)
1/2 (flared) (KA15)
6-23/32
19-11/16
31-1/2
2-23/32
Open as a rule 20 inch or more
if the front and both sides are open
SUZ-KA18NA
REQUIRED SPACE
4 inch or more/8 inch
or more if there are
obstacles to both sides
Air in
1-9/16
2
11-25/32
2-19/32
1-11/32
20-9/32
4 in
. or
14-3/16
Air in
13
in.
Open two sides of left,
right, or rear side.
11-1/32
13/32
14
ore
handle
Drain 3 holes
(ø1-5/16)
e
mor
mo
1-9/16
Air out
21-5/8
Basically open 4 inch or more
without any obstruction in front
and on both sides of the unit.
1-5/8
13-9/16
Air in
Drain hole
12 ~ 12-3/4
1-3/4
15-3/4
mo
re
14
Air out
19-11/16
33-1/16
3-3/16
Open as a rule
20 inch or more if the back,
both sides and top are open
8-11/32
2-9/16
3-9/16
35°
30°
16-15/16
33-7/16
4-25/32
4-3/8 × 13/16 slot
Liquid:1/4(flared)
Gas :1/2(flared)
in.
or m
ore
SYMBOL
C62,C63
DB61,DB65
F701,F801,F901
H
IC802
IPM,IC932
L61
LED
W RED 3
MS V WHT
3~
BLK
MC U
1
IPM
U
V
W
P
N
INVERTER P.C. BOARD
LDW
LDV
LDU
TR821
MS
3~
MF
3
CN932
F901
F801
3
1
IC932
T801
t°
1
RT68
t°
RT65
CN643
3 1
BLU
YLW
t°
2 1
t°
RT61 RT62
CN641
4 1
RT68
NAME
OUTDOOR HEAT EXCHANGER
TEMP. THERMISTOR.
TERMINAL BLOCK
TB1,TB2
SWITCHING POWER TRANSISTOR
TR821
T801
TRANSFORMER
X63,X64,X66 RELAY
21S4
REVERSING VALVE COIL
HEATER PROTECTOR(OPTION PARTS)
26H
t°
21
5
5
CN644
SYMBOL
RT64
L61
CN931
CN642
1
IC802
NAME
SYMBOL
NAME
LEV
EXPANSION VALVE COIL
SMOOTHING CAPACITOR
DIODE MODULE
MC
COMPRESSOR
FUSE (T3.15AL250V)
MF
FAN MOTOR
DEFROST HEATER(OPTION PARTS) PTC64,PTC65 CIRCUIT PROTECTION
INTELLIGENT POWER DEVICE
DEFROST THERMISTOR
RT61
RT62
DISCHARGE TEMP.THERMISTOR
INTELLIGENT POWER MODULE
FIN TEMP.THERMISTOR
REACTOR
RT64
AMBIENT TEMP.THERMISTOR
LED
RT65
CN61
RED
WHT
BLK
1
3
LD66
LD70
–
DB61
DB65 ~
– ~
~ C63 C62
+
+ +
~
+
ORN
SUZ-KA09NA, SUZ-KA12NA WIRING DIAGRAM
LEV
M
6
CN724
LED
LD61
F701
LD63
3
4
1
LD62
PTC65
PTC64
X64
X63
21S4
LD-S
LD-E1
CN721
2
BRN
BLU
RED
BLK
YLW
2
2
BLK
H
26H
(OPTION PARTS)
BLK
BLK
BLK
BLK
BLK
S3
S2
S1
TB2
From INDOOR UNIT
CONNECTING WIRES
DC12-24V
TO INDOOR UNIT
CONNECTING WIRES
208/230V
1 phase 60Hz
From INDOOR UNIT
CONNECTING WIRE
GROUND
TB1 CIRCUIT
BREAKER
POWER SUPPLY
L2
208/230V
L1
1 phase 60Hz
1
1
1
1
2
2
NOTES:
1. About the indoor side electric wiring refer to
the indoor unit electric wiring diagram
for servicing.
2. Use copper conductors only. (For field wiring).
6
X66
1
CN722
BLK
RED
SUZ-KA09NA
BLU
BRN
5
WIRING DIAGRAM
SUZ-KA12NA
SYMBOL
C61,C62,C63
DB61,DB65
F701,F801,F901
H
IC802
IPM,IC932
L61
LED
CN61
RED
WHT
BLK
1
3
IPM
U
V
W
P
N
INVERTER P.C. BOARD
LDW
LDV
LDU
TR821
NAME
SYMBOL
LEV
SMOOTHING CAPACITOR
DIODE MODULE
MC
FUSE (T3.15AL250V)
MF
DEFROST HEATER(OPTION PARTS) PTC64,PTC65
INTELLIGENT POWER DEVICE
RT61
INTELLIGENT POWER MODULE
RT62
REACTOR
RT64
LED
RT65
W RED 3
MS V WHT
3~
BLK
MC U
1
3
1
IC932
T801
NAME
EXPANSION VALVE COIL
COMPRESSOR
FAN MOTOR
CIRCUIT PROTECTION
DEFROST THERMISTOR
DISCHARGE TEMP.THERMISTOR
FIN TEMP.THERMISTOR
AMBIENT TEMP.THERMISTOR
MS
3~
MF
CN932
3
F801
F901
LD66
LD70
–
DB61
~
DB65
– ~
+
~ C63 C62 C61
+ + +
~
+
SUZ-KA15NA WIRING DIAGRAM
t°
1
RT68
t°
RT65
CN643
3 1
5
BLU
YLW
t°
RT61 RT62
t°
2 1
CN641
4 1
RT68
NAME
OUTDOOR HEAT EXCHANGER
TEMP. THERMISTOR.
TERMINAL BLOCK
TB1,TB2
TR821
SWITCHING POWER TRANSISTOR
TRANSFORMER
T801
X63,X64,X66 RELAY
REVERSING VALVE COIL
21S4
HEATER PROTECTOR(OPTION PARTS)
26H
t°
21
5
CN644
CN931
L61
SYMBOL
RT64
CN642
1
IC802
ORN
LED
6
LD61
F701
LD63
3
4
1
LD62
PTC65
PTC64
X64
X63
LD-S
LD-E1
CN721
2
BLK
BLK
2
2
BLK
H
26H
(OPTION PARTS)
BLK
BLK
BLK
BLK
BLK
TB2
From INDOOR UNIT
CONNECTING WIRES
DC12-24V
TO INDOOR UNIT
CONNECTING WIRES
208/230V
1 phase 60Hz
From INDOOR UNIT
CONNECTING WIRE
GROUND
TB1 CIRCUIT
BREAKER
POWER SUPPLY
L2
208/230V
L1
1 phase 60Hz
1
1
1
1
2
2
S3
BLU S2
BRN S1
RED
YLW
NOTES:
1. About the indoor side electric wiring refer to
the indoor unit electric wiring diagram
for servicing.
2. Use copper conductors only. (For field wiring).
LEV
M
6
CN724
X66
1
CN722
21S4
RED
BLU
BRN
SUZ-KA15NA
C61,C62,C63
DB61,DB65
F701,F801,F901
H
IC802
IPM, HC930
L61
LED
SYMBOL
LDW
LDV
LDU
P
N
IPM
U
V
W
NAME
TR821
~
1
+
+
SYMBOL
CN931
+
MF
3~
3
5
MS
CN932
3
NAME
F801
F901
YLW
5
C63 C62 C61
LD66
L61
1
IC802
t°
1
RT64
t°
RT65
RT68
NAME
t°
CN641
4 1
RT61 RT62
t°
2 1
CN643
3 1
SYMBOL
RT68
CN644
INVERTER P.C. BOARD
BLU
OUTDOOR HEAT EXCHANGER
TEMP. THERMISTOR.
TERMINAL BLOCK
TB1,TB2
SWITCHING POWER TRANSISTOR
TR821
TRANSFORMER
T801
X63,X64,X66 RELAY
REVERSING VALVE COIL
21S4
26H
HEATER PROTECTOR(OPTION PARTS)
t°
2 1
CN642
HC930
T801
LEV
SMOOTHING CAPACITOR
EXPANSION VALVE COIL
COMPRESSOR
MC
DIODE MODULE
FAN MOTOR
FUSE (T3.15AL250V)
MF
DEFROST HEATER(OPTION PARTS) PTC64,PTC65 CIRCUIT PROTECTION
RT61
DEFROST THERMISTOR
INTELLIGENT POWER DEVICE
RT62
DISCHARGE TEMP.THERMISTOR
INTELLIGENT POWER MODULE
RT64
FIN TEMP.THERMISTOR
REACTOR
AMBIENT TEMP.THERMISTOR
LED
RT65
W RED3 3 RED
WHT
MS V WHT
3~
BLK
BLK
MC U
1
1
CN61
+
~
– ~
DB61
+
DB65 ~
–
LD70
ORN
LED
6
LD61
F701
LD63
3
4
LD62
PTC65
PTC64
X64
X63 1
BLU
LD-S
LD-E1
CN721
2
21S4
BRN
TB2
L2
L1
TB1
S3
S2
BLU
BRN S1
RED
BLK
2
2
1
1
1
1
2
2
POWER SUPPLY
208/230V
1 phase 60Hz
GROUND
TO INDOOR UNIT
CONNECTING WIRES
208/230V
1 phase 60Hz
FROM
INDOOR UNIT
CONNECTING WIRE
FROM
INDOOR UNIT
CONNECTING WIRES
DC12-24V
CIRCUIT BREAKER
BLK
H
26H
(OPTION PARTS)
BLK
BLK
BLK
BLK
BLK
NOTES:
1. About the indoor side electric wiring refer to the indoor unit electric
wiring diagram for servicing.
2. Use copper conductors only. (For field wiring).
LEV
M
6
CN724
X66
1
CN722
BLK
RED
YLW
SUZ-KA18NA WIRING DIAGRAM
SUZ-KA18NA
6
REFRIGERANT SYSTEM DIAGRAM
SUZ-KA09NA
Unit: inch (mm)
Refrigerant pipe ø3/8
(with heat insulator)
4-way valve
Muffler
Stop valve
(with service port)
Outdoor
heat
exchanger
Muffler
Discharge
temperature
thermistor
Service port
RT62
Compressor
Service port
Flared connection
Ambient
temperature
thermistor
RT65
Defrost
thermistor
RT61
Flared connection
Refrigerant pipe ø1/4
(with heat insulator)
SUZ-KA12NA
Outdoor heat
exchanger
temperature
thermistor
RT68
Strainer
#100
Capillary tube
O.D. 0.118 × I.D. 0.079
× 9-7/16
LEV
(ø3.0 × ø2.0 × 240)
R.V. coil
heating ON
cooling OFF
Stop valve
(with strainar)
Refrigerant flow in cooling
Refrigerant flow in heating
SUZ-KA15NA
Refrigerant pipe ø3/8 (KA12)
Refrigerant pipe ø1/2 (KA15)
(with heat insulator)
Unit: inch (mm)
4-way valve
Muffler
Stop valve
(with service port)
Flared connection
Discharge
temperature
thermistor
RT62
Refrigerant pipe ø1/4
(with heat insulator)
Service port
Outdoor
heat
exchanger
Compressor
Service port
Flared connection
Muffler
Defrost
thermistor
RT61
Capillary tube
O.D. 0.118 × I.D. 0.079
LEV
× 9-7/16
(ø3.0 × ø2.0 × 240)
Capillary tube
O.D. 0.118 × I.D. 0.071
× 23-5/8
(ø3.0 × ø1.8 × 600) (×2)
Stop valve
(with strainar)
Outdoor heat
exchanger
temperature
thermistor
RT68
Ambient
temperature
thermistor
RT65
Strainer
#100
R.V. coil
heating ON
cooling OFF
Refrigerant flow in cooling
Refrigerant flow in heating
SUZ-KA18NA
Unit: inch (mm)
Muffler
4-way valve #100
Refrigerant pipe ø1/2
(with heat insulator)
Flared connection
Stop valve
(with service port)
Service port
Service port
Discharge
temperature
thermistor
RT62
Defrost
thermistor
RT61
Compressor
Flared connection
LEV
Receiver
Refrigerant pipe ø1/4
(with heat insulator)
Stop valve
(with strainar)
Strainer
#100
Capillary tube
O.D. 0.142 × I.D. 0.094
× 1-31/32
(ø3.6×ø2.4×50)
Outdoor
heat
exchanger
Ambient
temperature
thermistor
RT65
Outdoor heat
exchanger
temperature
thermistor
RT68
R.V. coil
heating ON
cooling OFF
Refrigerant flow in cooling
Refrigerant flow in heating
MAX. REFRIGERANT PIPING LENGTH and MAX. HEIGHT DIFFERENCE
Model
Refrigerant piping: ft.
Max. Length
Max. Height difference
A
B
Piping size O.D: in.
Gas
SUZ-KA09/12/15NA
65
40
3/8 (KA09/12)
1/2 (KA15)
SUZ-KA18NA
100
50
1/2
Indoor
unit
Max. Height
difference
B
Max. Length
A
Outdoor unit
Liquid
1/4
ADDITIONAL REFRIGERANT CHARGE (R410A: oz.)
Refrigerant piping exceeding 25 ft. requires additional refrigerant charge according to the calculation.
Model
SUZ-KA09NA
SUZ-KA12NA
SUZ-KA15NA
Outdoor unit
precharged
Refrigerant piping length (one way): ft.
40
50
25
30
0
1.62
60
65
11.34
12.96
1 lb. 16 oz.
2 lb. 9 oz.
4.86
8.10
Calculation: X oz. = 1.62/5 oz. / ft. × (Refrigerant piping length (ft.) - 25)
Model
SUZ-KA18NA
Refrigerant piping length (one way): ft.
50
60
70
80
Outdoor unit
precharged
25
30
40
3 lb. 16 oz.
0
1.08
3.24
5.40
7.56
9.72
11.88
90
100
14.04
16.20
Calculation: X oz. = 1.08/5 oz. / ft. × (Refrigerant piping length (ft.) - 25)
NOTE: Refrigerant piping exceeding 25 ft. requires additional refrigerant charge according to the calculation.
10
7
DATA
STANDARD OPERATION DATA
Representative matching
Total
Item
Capacity
SEZ-KD09NA4
Unit
Cooling
Heating
Cooling
Heating
8100
10900
11500
13600
Electrical circuit
Cooling Heating Cooling Heating
14100
18000
17200
21600
SHF
-
0.80
—
0.76
—
0.80
—
0.79
—
kW
0.670
1.020
0.920
1.140
1.170
1.500
1.380
1.700
SEZ-KD09NA4
SEZ-KD12NA4
kW
0.06
0.04
0.07
0.05
0.09
0.07
0.09
0.07
A
0.51
0.39
0.57
0.46
0.74
0.63
0.74
0.63
Power supply (V, Phase, Hz)
SEZ-KD15NA4
SEZ-KD18NA4
230, 1, 60
Input
Current
Outdoor unit
SUZ-KA09NA
SUZ-KA12NA
kW
0.61
0.98
0.85
1.09
1.08
1.43
1.39
1.63
Power supply (V, phase, Hz)
SUZ-KA15NA
SUZ-KA18NA
230, 1, 60
Current
Refrigerant circuit
SEZ-KD18NA4
Input
Input
A
2.80
4.33
3.64
4.65
4.45
5.96
5.38
6.91
Condensing pressure
PSIG
398
448
387
386
399
389
373
397
Suction pressure
PSIG
135
97
135
104
133
96
142
100
Discharge temperature
°F
148
170
162
165
159
182
150
172
Condensing temperature
°F
116
125
114
114
116
115
112
116
Suction temperature
°F
49
33
55
35
46
41
52
33
Ref. pipe length
ft.
70
80
Refrigerant charge (R410A)
Indoor
unit
SEZ-KD15NA4
Btu/h
Indoor unit
Outdoor
unit
SEZ-KD12NA4
Intake air temperature
Discharge air temperature
Intake air temperature
-
25
1 lb. 16 oz.
DB
°F
80
WB
°F
DB
°F
DB
WB
2 lb. 9 oz.
70
80
67
60
61
102
°F
95
°F
—
3 lb. 16 oz.
70
80
67
60
67
60
67
60
58
103
60
102
60
101
47
95
47
95
47
95
47
43
—
43
—
43
—
43
11
70
Representative matching
Total
Item
Capacity
SLZ-KA09NA
Unit
Cooling
Heating
Cooling
Heating
Cooling
Heating
8400
10900
11100
13600
15000
18000
SHF
-
0.84
—
0.77
—
0.67
—
Input
kW
0.700
0.930
0.920
1.180
1.460
1.950
Electrical circuit
SLZ-KA09NA
SLZ-KA15NA
230, 1, 60
Input
Current
kW
0.08
0.08
0.09
0.09
0.09
0.09
A
0.35
0.35
0.40
0.40
0.65
0.65
Outdoor unit
SUZ-KA09NA
SUZ-KA12NA
Power supply (V, phase, Hz)
SUZ-KA15NA
230, 1, 60
Current
Refrigerant circuit
SLZ-KA12NA
Power supply (V, Phase, Hz)
Input
kW
0.63
0.86
0.84
1.10
1.38
1.87
A
3.12
4.02
3.82
4.93
5.98
8.10
Condensing pressure
PSIG
401
406
379
418
422
475
Suction pressure
PSIG
147
104
139
106
128
98
Discharge temperature
°F
154
169
152
173
174
188
Condensing temperature
°F
116
117
111
118
118
128
Suction temperature
°F
52
34
51
36
51
31
Ref. pipe length
ft.
70
80
70
Refrigerant charge (R410A)
Indoor
unit
SLZ-KA15NA
Btu/h
Indoor unit
Outdoor
unit
SLZ-KA12NA
Intake air temperature
Discharge air temperature
Intake air temperature
25
DB
°F
WB
DB
1 lb. 16 oz.
2 lb. 9 oz.
80
70
80
°F
67
60
67
60
67
60
°F
62
97
60
101
57
111
DB
°F
95
47
95
47
95
47
WB
°F
—
43
—
43
—
43
12
8
ACTUATOR CONTROL
SUZ-KA09NA
SUZ-KA12NA
SUZ-KA15NA
SUZ-KA18NA
8-1. OUTDOOR FAN MOTOR CONTROL
The fan motor turns ON/OFF, interlocking with the compressor.
[ON] The fan motor turns ON 5 seconds before the compressor starts up.
[OFF] The fan motor turns OFF 15 seconds after the compressor has stopped running.
5 seconds
ON
15 seconds
Compressor
OFF
ON
Outdoor fan
motor
OFF
8-2. R.V. COIL CONTROL
Heating. . . . . . . . . . . . . . . . . . ON
ooling . . . . . . . . . . . . . . . . . . OFF
C
Dry . . . . . . . . . . . . . . . . . . . . . OFF
NOTE: The 4-way valve reverses for 5 seconds right before start-up of the compressor.
<COOL>
<HEAT>
5 seconds
Compressor
ON
OFF
R.V.coil
ON
OFF
5 seconds
Outdoor fan ON
OFF
motor
8-3. RELATION BETWEEN MAIN SENSOR AND ACTUATOR
Sensor
Discharge temperature
thermistor
Indoor coil temperature
thermistor
Defrost thermistor
Fin temperature thermistor
Ambient temperature
thermistor
Outdoor heat exchanger temperature thermistor
Purpose
Compressor
LEV
○
○
○
○
○
○
○
○
○
Protection
Cooling: Coil frost prevention
Heating: High pressure protection
Heating: Defrosting
Protection
Cooling: Low ambient temperature operation
Cooling: Low ambient temperature operation
Cooling: High pressure protection
13
○
○
○
○
○
Actuator
Outdoor fan
motor
○
○
○
○
○
R.V.coil
Indoor fan
motor
○
○
9
SERVICE FUNCTIONS
SUZ-KA09NA
SUZ-KA12NA
SUZ-KA15NA
SUZ-KA18NA
9-1. CHANGE IN DEFROST SETTING
Changing defrost finish temperature
<JS> To change the defrost finish temperature, cut/solder the JS wire of the outdoor inverter P.C. board.
(Refer to 10-6-1.)
Defrost finish temperature
SUZ-KA09/12/15
SUZ-KA18
Jumper
JS
Soldered
(Initial setting)
41°F (5°C)
48°F (9°C)
None
(Cut)
50°F (10°C)
64°F (18°C)
9-2. PRE-HEAT CONTROL SETTING
PRE-HEAT CONTROL
When moisture gets into the refrigerant cycle, it may interfere the start-up of the compressor at low outside temperature.
The pre-heat control prevents this interference. The pre-heat control turns ON when outside temperature is 68°F (20°C)
or below. When pre-heat control is turned ON, compressor is energized. (About 50 W)
<JK> To activate the pre-heat control, cut the JK wire of the inverter P.C. board. (Refer to 10-6.1)
NOTE: When the inverter P.C. board is replaced, check the Jumper wires, and cut/solder them if necessary.
10
TROUBLESHOOTING
SUZ-KA09NA
SUZ-KA12NA
SUZ-KA15NA
SUZ-KA18NA
10-1. CAUTIONS ON TROUBLESHOOTING
1. Before troubleshooting, check the following
1) Check the power supply voltage.
2) Check the indoor/outdoor connecting wire for miswiring.
2. Take care of the following during servicing
1) Before servicing the air conditioner, be sure to turn OFF the main unit first with the remote controller, and turn off the
breaker.
2) Be sure to turn OFF the power supply before removing the front panel, the cabinet, the top panel, and the electronic
control P.C. board.
3) When removing the electrical parts, be careful of the residual voltage of smoothing capacitor.
4) When removing the electronic control P.C. board, hold the edge of the board with care NOT to apply stress on the
components.
5) When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires.
Lead wiring
Housing point
3. Troubleshooting procedure
1) First, check if the OPERATION INDICATOR lamp is blinking ON and OFF to indicate an abnormality.
2) Before servicing check that the connector and terminal are connected properly.
3) When the electronic control P.C. board seems to be defective, check the copper foil pattern for disconnection and the
components for bursting and discoloration.
4) Refer to 10-2. and 10-3.
14
10-2. Failure mode recall function
As this air conditioner has a function to memorize all the failures that had happened, the latest failure detail can be
recalled by following the procedures below.
10-2-1. Wired remote controller
CHECK button
Refrigerant address
TEMP. button
IC: Indoor unit
OC: Outdoor unit
Check code
°C
°C
SIMPLE
TEMP.
MENU
BACK
PAR-21MAA
MONITOR/SET
ON/OFF
ON/OFF
FILTER
DAY
CLOCK
Turn on the power.
Press the [CHECK] button twice.
Set refrigerant address with [TEMP] button
if system control is used.
Press the [ON/OFF] button to stop the self-check.
CHECK TEST
OPERATION
CLEAR
10-2-2. Failure mode table (Wired remote controller)
[Output pattern A] Errors detected by indoor unit
Wired remote controller
Symptom
Check code
Remark
Intake sensor error
Pipe (TH2) sensor error
Pipe (TH5) sensor error
Indoor/outdoor unit communication error
Drain sensor error/Float switch connector open
Drain pump error
Freezing/Overheating protection operation
Communication error between indoor and outdoor units
Pipe temperature error
Remote controller signal receiving error
Indoor unit control system error (memory error, etc.)
Remote controller transmission error
Remote controller control board error
P1
P2
P9
E6,E7
P4
P5
P6
EE
P8
E4, E5
Fb
E0, E3
E1, E2
[Output pattern B] Errors detected by unit other than indoor unit (outdoor unit, etc.)
Wired remote controller
Symptom
Check code
E9
UP
U3,U4
UF
U2
U1,Ud
U5
U8
U6
U7
U9,UH
Others
Remark
Indoor/outdoor unit communication error (Transmitting error) (Outdoor unit)
Compressor overcurrent interruption
Open/short of outdoor unit thermistors
Compressor overcurrent interruption (When compressor locked)
Abnormal high discharging temperature/insufficient refrigerant
Abnormal high pressure/Overheating protection operation
Abnormal temperature of heat sink
For details, check the LED display
Outdoor unit fan protection stop
of the outdoor controller board.
Compressor overcurrent interruption/Abnormal of power module
Abnormality of super heat due to low discharge temperature
Abnormality such as overvoltage or voltage shortage and abnormal
synchronous signal to main circuit/Current sensor error
Other errors
• On wired remote controller
Check code displayed in the LCD.
15
10-2-3. Outdoor unit failure mode table
Abnormal point
(Failure mode / protection)
None (Normal)
LED indication
(Outdoor P.C. board)
Condition
Remedy
—
—
—
Outdoor power system
—
Discharge temperature
thermistor
Defrost thermistor
1-time flash every
2.5 seconds
Fin temperature thermistor
3-time flash
2.5 seconds OFF
4-time flash
2.5 seconds OFF
2-time flash
2.5 seconds OFF
11-time flash
2.5 seconds OFF
P.C. board temperature
thermistor
Ambient temperature
thermistor
Overcurrent
Compressor synchronous
12-time flash
abnormality (Compressor start- 2.5 seconds OFF
up failure protection)
Discharge temperature
—
High pressure
—
Fin temperature/ P.C. board
temperature
7-time flash
2.5 seconds OFF
Outdoor fan motor
—
Nonvolatile memory data
5-time flash
2.5 seconds OFF
Discharge temperature
—
DC voltage
8-time flash
2.5 seconds OFF
Each phase current of
compressor
9-time flash
2.5 seconds OFF
Overcurrent Compressor open- 10-time flash
phase
2.5 seconds OFF
Stop valve (Closed valve)
14-time flash
2.5 seconds OFF
Overcurrent protection stop is continuously
performed 3 times within 1 minute after the
compressor gets started.
Thermistor shorts or opens during compressor
running.
• Reconnect connectors.
• Refer to 10-5. "How to
check inverter/compressor".
• Check stop valve.
• Refer to 10-5. "Check of
outdoor thermistors".
Defective outdoor thermistors
can be identified by checking
the blinking pattern of LED.
Indoor/
unit
outdoor unit Outdoor
failure mode
failure mode recall
function
recall function
—
—
○
○
○
○
—
○
—
○
—
○
—
○
—
○
—
○
○
○
—
○
—
○
—
○
○
○
Large current flows into intelligent power
module.
• Reconnect compressor
connector.
• Refer to 10-5. "How to check
inverter/compressor".
• Check stop valve.
Waveform of compressor current is distorted.
• Reconnect compressor
connector.
• Refer to 10-5. "How to check
inverter/compressor".
Temperature of discharge temperature
• Check refrigerant circuit and
thermistor exceeds 241°F (116°C), compressor refrigerant amount.
stops.
• Refer to 10-5. "Check of
Compressor can restart if discharge temperature LEV".
thermistor reads 212°F (100°C) or less 3
minutes later.
Temperature of indoor coil thermistor exceeds
• Check refrigerant circuit and
158°F (70°C) in HEAT mode. Temperature of
refrigerant amount.
outdoor heat exchanger temperature thermistor • Check stop valve.
exceeds 158°F (70°C) in COOL mode.
Temperature of fin temperature thermistor on the • Check around outdoor unit.
inverter P.C. board exceeds 167 ~ 176°F (75 ~ • Check outdoor unit air
80°C), or temperature of P.C. board temperature passage.
thermistor on the inverter P.C. board exceeds
• Refer to 10-5. "Check of
158 ~ 167°F (70 ~ 75°C).
outdoor fan motor".
Outdoor fan has stopped 3 times in a row within • Refer to 10-5. "Check of
outdoor fan motor". Refer to
30 seconds after outdoor fan start-up.
10-5. "Check of inverter P.C.
board".
Nonvolatile memory data cannot be read
• Replace the inverter P.C.
properly.
board.
Temperature of discharge temperature
• Refer to 10-5. "Check of
thermistor has been 122°F (50°C) or less for 20 LEV".
minutes.
• Check refrigerant circuit and
refrigerant amount.
DC voltage of inverter cannot be detected
• Refer to 10-5. "How to check
normally.
inverter/compressor".
Each phase current of compressor cannot be
detected normally.
Large current flows into intelligent power module • Reconnect compressor
(IPM).
connector.
The open-phase operation of compressor is
• Refer to 10-5. "How to
detected.
check inverter/compressor".
The interphase short out occurs in the output of
the intelligent power module (IPM).
The compressor winding shorts out.
Closed valve is detected by compressor current. • Check stop valve
NOTE: Blinking patterns of this mode differ from the ones of Troubleshooting check table (10-3.).
16
10-3. TROUBLESHOOTING CHECK TABLE
No. Symptom
Outdoor
does
1 unit
not operate.
2
3
4
5
6
'Outdoor
stops
7 unit
and restarts 3
minutes
later' is
8 repeated.
9
10
11
12
13
14
15 Outdoor
unit operates.
16
17
Outdoor
18 unit operates.
19
20
Abnormal point/
Condition
Remedy
Condition
1-time flash every Outdoor power sys- Overcurrent protection stop is continuously performed 3 times
• Reconnect connector of compressor.
2.5 seconds
tem
within 1 minute after the compressor gets started, or failure of re- • Refer to 10-5. "How to check inverter/
start of compressor has repeated 24 times.
compressor".
• Check stop valve.
Outdoor thermistors Discharge temperature thermistor, fin temperature thermistor, de- • Refer to 10-5. "Check of outdoor
frost thermistor, outdoor heat exchanger temperature thermistor, thermistors".
P.C. board temperature thermistor or ambient temperature thermistor shorts or opens during compressor running.
Outdoor control sys- Nonvolatile memory data cannot be read properly.
• Replace inverter P.C. board.
tem
6-time flash
Serial signal
The communication fails between the indoor and outdoor unit for • Refer to 10-5. "How to check miswir2.5 seconds OFF
3 minutes.
ing and serial signal error.
11-time flash
Stop valve/
Closed valve is detected by compressor current.
• Check stop valve.
2.5 seconds OFF Closed valve
14-time flash
Outdoor unit
Outdoor unit is defective.
• Refer to 10-2.2. "Flow chart of the de2.5 seconds OFF (Other abnormality)
tailed outdoor unit failure mode recall
function".
2-time flash
Overcurrent protec- Large current flows into intelligent power module.
• Reconnect connector of compressor.
2.5 seconds OFF tion
When overcurrent protection occurs within 10 seconds after
• Refer to 10-5. "How to check inverter/
compressor starts, compressor restarts after 15 seconds.
compressor".
• Check stop valve.
3-time flash
Discharge tempera- Temperature of discharge temperature thermistor exceeds 241°F • Check refrigerant circuit and refrigerant
2.5 seconds OFF ture overheat protec- (116°C), compressor stops. Compressor can restart if discharge
amount.
tion
temperature thermistor reads 212°F (100°C) or less 3 minutes
• Refer to 10-5. "Check of LEV".
later.
4-time flash
Fin temperature /P.C. Temperature of fin temperature thermistor on the heat sink ex• Check around outdoor unit.
2.5 seconds OFF board temperature ceeds 167 ~ 176°F (75 ~ 80°C) or temperature of P.C. board tem- • Check outdoor unit air passage.
thermistor overheat perature thermistor on the inverter P.C. board exceeds 158 ~ 167 • Refer to 10-5. "Check of outdoor fan
protection
°F (70 ~ 75°C).
motor".
5-time flash
High pressure pro- Temperature of indoor coil thermistor exceeds 158°F (70°C) in
• Check refrigerant circuit and refrigerant
2.5 seconds OFF tection
HEAT mode. Temperature of outdoor heat exchanger temperature amount.
thermistor exceeds 158°F (70°C) in COOL mode.
• Check stop valve.
8-time flash
Compressor synThe waveform of compressor current is distorted.
• Reconnect connector of compressor.
2.5 seconds OFF chronous abnormal• Refer to 10-5. "How to check inverter/
ity
compressor".
10-time flash
Outdoor fan motor
Outdoor fan has stopped 3 times in a row within 30 seconds after • Refer to 10-5. "Check of outdoor fan
2.5 seconds OFF
outdoor fan start-up.
motor.
• Refer to 10-5. "Check of inverter P.C.
board.
12-time flash
Each phase current Each phase current of compressor cannot be detected normally. • Refer to 10-5. "How to check inverter/
2.5 seconds OFF of compressor
compressor".
13-time flash
DC voltage
DC voltage of inverter cannot be detected normally.
• Refer to 10-5. "How to check inverter/
2.5 seconds OFF
compressor".
1-time flash
Frequency drop by Current from power outlet is nearing Max. fuse size.
The unit is normal, but check the follow2.5 seconds OFF current protection
ing.
•
Check if indoor filters are clogged.
3-time flash
Frequency drop by Temperature of indoor coil thermistor exceeds 131°F (55°C) in
• Check if refrigerant is short.
2.5 seconds OFF high pressure protec- HEAT mode, compressor frequency lowers.
• Check if indoor/outdoor unit air circulation
tion is short cycled.
Frequency drop by Indoor coil thermistor reads 46°F (8°C) or less in COOL mode,
defrosting in COOL compressor frequency lowers.
mode
4-time flash
Frequency drop by Temperature of discharge temperature thermistor exceeds 232°F • Check refrigerant circuit and refrigerant
2.5 seconds OFF discharge tempera- (111°C), compressor frequency lowers.
amount.
ture protection
• Refer to 10-5. "Check of LEV".
• Refer to 10-5. "Check of outdoor
thermistors".
7-time flash
Low discharge tem- Temperature of discharge temperature thermistor has been 122°F • Refer to 10-5. "Check of LEV".
2.5 seconds OFF perature protection (50°C) or less for 20 minutes.
• Check refrigerant circuit and refrigerant
amount.
8-time flash
PAM protection PAM: The overcurrent flows into IGBT (Insulated Gate Bipolar transis- This is not malfunction. PAM protection
2.5 seconds OFF Pulse Amplitude
tor: TR821) or the bus-bar voltage reaches 320 V or more, PAM will be activated in the following cases:
Modulation
stops and restarts.
1 Instantaneous power voltage drop
(Short time power failure)
2 When the power supply voltage is high.
9-time flash
Inverter check mode The connector of compressor is disconnected, inverter check
• Check if the connector of the compres2.5 seconds OFF
mode starts.
sor is correctly connected. Refer to
10-5. "How to check inverter/compressor".
LED indication
NOTE: 1. The location of LED is illustrated at the right figure. Refer to 10-6.1.
2. LED is lighted during normal operation.
The flashing frequency shows the number of times the LED blinks after every 2.5-second OFF.
Inverter P.C. board (Parts side)
LED
(Example) When the flashing frequency is “2”.
Flashing →
0.5-second ON
0.5-second ON
ON
OFF
2.5-second OFF
2.5-second OFF
17
10-4. TROUBLE CRITERION OF MAIN PARTS
SUZ-KA09NA
SUZ-KA12NA
SUZ-KA15NA
Part name
Defrost thermistor (RT61)
Fin temperature
thermistor (RT64)
SUZ-KA18NA
Check method and criterion
Figure
Measure the resistance with a tester.
Refer to 10-6. “Test point diagram and voltage”, 1. “Inverter P.C.
board”, for the chart of thermistor.
Ambient temperature
thermistor (RT65)
Outdoor heat exchanger
temperature thermistor
(RT68)
Discharge temperature
thermistor (RT62)
Measure the resistance with a tester. Before measurement, hold the
thermistor with your hands to warm it up.
Refer to 10-6. “Test point diagram and voltage”, 1. “Inverter P.C.
board”, for the chart of thermistor.
Measure the resistance between terminals with a tester.
(Temperature: 14 ~ 104 °F (-10 ~ 40 °C))
Compressor
U-V
U-W
V-W
KA09
Normal (Ω)
KA12
KA15/18
1.36 ~ 1.93
1.52 ~ 2.17
0.78 ~ 1.11
WHT
W
V
Measure the resistance between lead wires with a tester.
(Temperature: 14 ~ 104 °F (-10 ~ 40 °C))
Color of lead wire
Outdoor fan motor
RED – BLK
BLK – WHT
WHT – RED
Normal (Ω)
KA09/12/15
28 ~ 40
RED BLK
WHT
U
RED BLK
KA18
11 ~ 16
Measure the resistance with a tester.
(Temperature: 14 ~ 104 °F (-10 ~ 40°C))
R. V. coil (21S4)
Normal (kΩ)
0.97 ~ 1.38
37 ~ 54
LEV
RED
ORN
18
BLU
Normal (Ω)
YLW
Expansion valve coil
(LEV)
Color of lead wire
WHT – RED
RED – ORN
YLW – BRN
BRN – BLU
WHT
BRN
Measure the resistance with a tester.
(Temperature: 14 ~ 104 °F (-10 ~ 40 °C))
10-5. TROUBLESHOOTING FLOW
A How to check inverter/compressor
Disconnect the connector (CN61) between
compressor and the intelligent power module
(IPM).
See 10-5.
Check the voltage between terminals.
Are the voltages balanced?
Yes
No
Replace the inverter P.C. board.
See 10-5.
Check the compressor.
“Check of open phase”.
“Check of compressor”.
B Check of open phase
● With the connector between the compressor and the intelligent power module disconnected, activate the inverter and check if
the inverter is normal by measuring the voltage balance between the terminals.
Output voltage is 50 - 130 V. (The voltage may differ according to the tester.)
<< Operation method (Test run operation)>>
1. Press the TEST (RUN) button twice.
2. Press the MODE button and switch to the COOL (or HEAT) mode.
3. Compressor starts at rated frequency in COOL mode or 58 Hz in HEAT mode.
4. Indoor fan operates at High speed.
5. To cancel test run operation, press the ON/OFF button on remote controller.
<<Measurement point>>
at 3 points
BLK (U) - WHT (V)
BLK (U) - RED (W)
WHT(V) - RED (W)
Measure AC voltage between the lead wires at 3 points.
NOTE: 1. Output voltage varies according to power supply voltage.
2. Measure the voltage by analog type tester.
3. During this check, LED of the inverter P.C. board flashes 9 times. (Refer to 10-6.1.)
C Check of compressor
Refer to 10-5. “Check of compressor
winding”.
Is the compressor normal?
Yes
Refer to 10-5. “Check of compressor
operation time”.
Does the compressor operate continuously?
Yes
No
No
Replace the compressor.
Refer to 10-5.
OK.
19
“Check of compressor start failure”.
D Check of compressor winding
● Disconnect the connector (CN61) between the compressor and intelligent power module, and measure the resistance between the compressor terminals.
<<Measurement point>>
at 3 points
BLK - WHT
Measure the resistance between the lead wires at 3 points.
BLK - RED
WHT - RED
<<Judgement>>
Refer to 10-4.
0[Ω]·················· Abnormal [short]
Infinite [Ω]········· Abnormal [open]
NOTE: Be sure to zero the ohmmeter before measurement.
E Check of compressor operation time
<<Judgement>>
●Connect the compressor and activate the inverter. Then measure
the time until the inverter stops due to over current.
<<Operation method>>
Start heating or cooling operation by pressing the TEST button
twice on the remote controller. (Test run mode)
(TEST RUN OPERATION: Refer to 10-5 B.)
<<Measurement>>
Measure the time from the start of compressor to the stop of
compressor due to overcurrent.
0 second
Compressor starts
1 second
Abnormal
(IPM failure)
(Compressor winding short)
2 seconds
Abnormal
(Compressor lock out)
(Starting defect)
10 seconds
Abnormal
(Poor contact,)
(Outdoor P.C. board defect)
(Disconnected connector)
Abnormal
(Refrigerant circuit defect)
(Closed valve)
10 minutes
Normal
F Check of compressor start failure
Confirm that 1~4 is normal.
• Electrical circuit check
1. Contact of the compressor connector (including CN61)
. Output voltage of inverter P.C. board and balance of them (See 10-5. )
. Direct current voltage between DB61(+) and (-) on the inverter P.C. board
4. Voltage between outdoor terminal block S1-S2
Does the compressor run for 10 seconds or
more after it starts?
Yes
Check the refrigerant circuit.
Check the stop valve.
No
After the compressor is heated with a drier,
does the compressor start? 1
No
Replace the compressor.
Yes
1
Heat the compressor with
a drier for about 20 minutes.
Do not recover refrigerant
gas while heating.
Compressor start failure. Activate pre-heat control.
(Refer to 9-2. "PRE-HEAT CONTROL SETTING")
Heating part
20
G Check of outdoor thermistors
Disconnect the connector of thermistor in the outdoor P.C. board (see
below table), and measure the resistance of thermistor.
Is the resistance of thermistor normal?
(Refer to 10-6.1.)
Yes
No
Replace the thermistor except RT64. When RT64 is
abnormal, replace the inverter P.C. board.
Reconnect the connector of thermistor.
Turn ON the power supply and press the TEST button twice.
Does the unit operate for 10 minutes or more
without showing thermistor abnormality?
Yes
No
Replace the inverter P.C. board.
OK.
(Cause is poor contact.)
Thermistor
Symbol
Connector, Pin No.
Defrost
RT61 Between CN641 pin1 and pin2
Discharge temperature
RT62 Between CN641 pin3 and pin4
Fin temperature
RT64 Between CN642 pin1 and pin2
Ambient temperature
RT65 Between CN643 pin1 and pin2
Outdoor heat exchanger temperature RT68 Between CN644 pin1 and pin3
Board
Inverter P.C. board
H Check of R.V. coil
First of all, measure the resistance of R.V. coil to check if the coil is defective. Refer to 10-4.
In case CN721 is disconnected or R.V. coil is open, voltage is generated between the terminal pins of the connector
although no signal is being transmitted to R.V. coil.
Check if CN721 is connected.
Unit operates COOL mode even if it is set to HEAT mode.
Disconnect connector (CN61)
between the compressor and the
intelligent power module.
Turn ON the power supply and
press the TEST button twice (HEAT
mode).
Is there 208/230 VAC between CN721
and on the inverter P.C. board 3
minutes after the power supply is turned
ON?
Yes
No
Replace the inverter
P.C. board.
Replace the 4-way valve.
Unit operates HEAT mode even if it is set to COOL mode.
Disconnect connector (CN61)
between the compressor and the
intelligent power module.
Turn ON the power supply and
press the TEST button once (COOL
mode).
Is there 208/230 VAC between CN721
and on the inverter P.C. board 3
minutes after the power supply is turned
ON?
No
Replace the 4-way valve.
21
Replace the inverter
Yes P.C. board.
I Check of outdoor fan motor
SUZ-KA09/12/15NA
Disconnect CN932 from the inverter P.C. board,
and measure the resistance of the outdoor fan
motor.
Is the resistance of outdoor fan motor normal?
(Refer to 10-4.)
Yes
No
Replace the outdoor fan motor.
Replace the inverter P.C. board.
SUZ-KA18NA
Check the connection between the
connector CN931 and CN932.
Is the resistance between each terminal of outdoor fan motor normal?
(Refer to 10-4.)
No
Yes
Disconnect CN932 from the inverter P.C. board, and turn on the
power supply.
Rotate the outdoor fan motor manually and measure the voltage
of CN931.
Between 1(+) and 5(-)
Between 2(+) and 5(-)
Between 3(+) and 5(-)
(Fixed to either 5 or 0 VDC)
No
No
Does the voltage between each terminal become 5 and 0
VDC repeatedly?
Yes
Does the outdoor fan motor rotate smoothly?
Yes
Replace the inverter P.C. board.
Replace the outdoor fan motor.
22
J Check of power supply
Disconnect the connector (CN61)
between compressor and intelligent
power module.
Turn ON power supply and press
the TEST button twice.
Does the POWER lamp on remote
controller light up?
Rectify indoor/outdoor
connecting wire.
No
Yes
Is there voltage 208/230 VAC
between the indoor terminal
block S1 and S2?
No
Replace the indoor
electronic control P.C.
board.
Yes
Is there bus-bar voltage 260-325
VDC between DB61 (+) and DB61 (–)
Yes
on the inverter P.C. board?
(Refer to 10-6.1.)
No
Check the electric parts in main circuit.
Does LED on the inverter P.C.
board light up or flash? (Refer
to 10-6.1.)
Yes
If light up, OK.
If flash, refer to 10-3.
No
Replace the inverter
P.C. board.
260-325 VDC
DB61
Inverter P.C. board
(Solder side)
23
K Check of LEV (Expansion valve)
Self-check (Refer to 10-2-1.) start.
Expansion valve operates in full-opening direction.
Do you hear the expansion valve "click,
click·······"?
Do you feel the expansion valve vibrate
on touching it ?
Yes
OK
1. Regardless of normal or abnormal condition, a short beep
is emitted once the signal is received.
No
Is LEV coil properly fixed to
the expansion valve?
No
Yes
Does the resistance of LEV
coil have the characteristics?
Yes
(Refer to 10-4.)
No
Replace the LEV coil.
Properly fix the LEV coil to the expansion valve.
Measure each voltage between connector pins
of CN724 on the inverter P.C. board.
1. Pin (-) — Pin (+)
2. Pin (-) — Pin (+)
3. Pin (-) — Pin (+)
4. Pin (-) — Pin (+)
Is there about 3 ~ 5 VAC between each?
NOTE : Measure the voltage with an analog tester.
Yes
Replace the expansion valve.
NOTE : After check of LEV, turn OFF the power supply and turn ON it again.
24
No
Replace the inverter P.C.
board.
L Check of inverter P.C. board
Check the outdoor fan motor.
(Refer to 10-5. .)
Is the fuse (F901) blown on the inverter
P.C. board?
Yes
No
Check the connection of the connectors
(CN931, CN932) of the outdoor fan motor.
If the connection is poor, make it correct.
Operate the outdoor unit by starting
TEST RUN.
Check the LED indication on the inverter P.C. board.
Does the LED flash 10 times?
Yes
(10-time flash)
No
Check the remedy following LED
indication.
(Refer to 10-3.)
Replace the inverter P.C. board.
25
M How to check miswiring and serial signal error
Turn OFF the power supply.
Is there rated voltage in the power supply?
Yes
Check the power supply.
No
Turn ON the power supply.
Is there rated voltage between outdoor terminal block S1 and S2?
Yes
No
Check the wiring.
Press TEST button twice.
Does POWER lamp on remote controller light up?
<Confirmation of the power to the indoor unit>
No
Yes
Is the self-check of the remote controller
indicated 6 minutes later?
Yes
No
A
Is there any miswiring,
poor contact, or wire
disconnection of the
indoor/outdoor connecting wire?
No
Yes
Correct them.
1. Miswiring may damage indoor electronic control P.C.
board during the operation.
Be sure to confirm the wiring is correct before the operation starts.
3. Be sure to check this within 3 minutes after turning ON.
After 3 minutes, LED blinks 6 times. Even when the
inverter P.C. board or the outdoor electronic control P.C.
board is normal, LED blinks 6 times after 3 minutes.
Turn OFF the power supply.
Check once more if the indoor/outdoor
B connecting wire is not miswiring.
Short-circuit outdoor terminal block S2
and S3. 1
Turn ON the power supply.
Is the bus-bar voltage of the inverter P.C. board or the outdoor electronic control P.C. board normal. (Refer
to "TEST POINT DIAGRAM AND VOLTAGE" in this manual.)
No
Check of power supply.
(Refer to 10-5. .)
Yes
Does the LED on the inverter P.C. board or the outdoor electronic control P.C.
board repeat "3.6-second-OFF and 0.8-second-ON quick blinking"? 3
Yes
Turn OFF the power supply.
Remove the short-circuit between outdoor terminal block S2 and S3.
Turn ON the power supply.
Is there rated voltage between indoor terminal block S1 and S2?
<Confirmation of power voltage>
No
Yes
Is there amplitude of 10 to 20 VDC between indoor terminal block S2
and S3? <Confirmation of serial signal>
No
(Lighted
or not
lighted)
Replace the inverter P.C. board or the outdoor
electronic control P.C. board. 2
2. Be careful of the residual voltage of smoothing
capacitor.
Check the wiring
If there are any error of the indoor/outdoor connecting wire:
such as the damage of the wire, intermediate connection,
and/or poor contact to the terminal block, replace the indoor/
outdoor connecting wire.
No
Yes
A
• Turn OFF inverter-controlled lighting
equipment.
• Turn OFF the power supply and then
turn ON again.
• Press TEST button twice.
Reinstall either
Is the self-check
the unit or the
of the remote controller indicated 6
light away from
No each other.
minutes later?
Is there rated voltage between indoor terminal block S1 and S2?
<Confirmation of power voltage>
No
Yes
No
Is there any error of the indoor/outdoor connecting wire, such as the
damage of the wire, intermediate
connection, poor contact to the
terminal block?
No
Replace the indoor
controller P.C. board.
Is there any error of the indoor/outdoor connecting wire, such as the
damage of the wire, intermediate
connection, poor contact to the
terminal block?
Yes
Replace the indoor/outdoor
connecting wire.
Yes
B
26
Yes
N Electromagnetic noise enters into TV sets or radios
Is the unit grounded?
Ground the unit.
No
Yes
Is the distance between the antennas
and the indoor unit within 9.91 ft., or is
the distance between the antennas and
the outdoor unit within 9.91 ft.?
Yes
Extend the distance between the antennas and
the indoor unit, and/or the antennas and the
outdoor unit.
Yes
Extend the distance between the TV sets and/or
radios and the indoor unit, or the TV sets or
radios and the outdoor unit.
Yes
Replace or repair the antenna.
Replace or repair the coaxial cable.
Yes
Extend the distance between the indoor/outdoor
connecting wire of the air conditioner and the wiring of the antennas.
No
Is the distance between the TV sets or
radios and the indoor unit within 3.28
ft., or is the distance between the TV
sets or radios and the outdoor unit
within 9.91 ft.?
No
Are the antennas damaged?
Is the coaxial cable damaged?
Is there any poor contact in the antenna wiring?
No
Is the indoor/outdoor connecting wire
of the air conditioner and the wiring of
the antennas close?
No
Even if all of the above conditions are fulfilled, the electromagnetic noise may enter, depending on the electric field strength
or the installation condition (combination of specific conditions such as antennas or wiring).
Check the followings before asking for service.
1. Devices affected by the electromagnetic noise
TV sets, radios (FM/AM broadcast, shortwave)
2. Channel, frequency, broadcast station affected by the electromagnetic noise
3. Channel, frequency, broadcast station unaffected by the electromagnetic noise
4. Layout of:
indoor/outdoor unit of the air conditioner, indoor/outdoor wiring, grounding wire, antennas, wiring from antennas, receiver
5. Electric field intensity of the broadcast station affected by the electromagnetic noise
6. Presence or absence of amplifier such as booster
7. Operation condition of air conditioner when the electromagnetic noise enters in
1) Turn OFF the power supply once, and then turn ON the power supply. In this situation, check for the electromagnetic
noise.
2) Within 3 minutes after turning ON the power supply, press OPERATE/STOP (ON/OFF) button on the remote controller
for power ON, and check for the electromagnetic noise.
3) After a short time (3 minutes later after turning ON), the outdoor unit starts running. During operation, check for the electromagnetic noise.
4) Press OPERATE/STOP (ON/OFF) button on the remote controller for power OFF, when the outdoor unit stops but the
indoor/outdoor communication still runs on. In this situation, check for the electromagnetic noise.
27
10-6. TEST POINT DIAGRAM AND VOLTAGE
1. Inverter P.C. board
SUZ-KA09NA
SUZ-KA12NA
SUZ-KA15NA
Back side of unit
Smoothing
capacitor
(C62)
Smoothing
capacitor
(C63)
Bus-bar voltage
DB61
DC 260-325 V
(-)
(+)
Smoothing
capacitor
(C61)
Fuse (F701)
T3.15 AL 250 V
Fuse (F801)
250 V 3.15 A
AC 208/230 V
R.V.coil (CN721)
208/230 VAC
Fuse (F901)
T3.15 AL 250 V
Output to drive
compressor
(LDU, LDV,
LDW)
100
Discharge temperature
thermistor/RT62 (CN641)
Defrost thermistor/
RT61(CN641)
Ambient temperature
thermistor/RT65
(CN643)
Outdoor heat exchanger
temperature thermistor
/RT68 (CN644)
Fin temperature
thermistor/RT64 (CN642)
Front side of unit
Output to drive outdoor
fan motor (CN932)
AC 208/
230 V
LED
LEV
connector
(CN724)
Defrost thermistor(RT61)
Ambient temperature thermistor(RT65)
Outdoor heat exchanger temperature thermistor(RT68)
200
60
600
Resistance(kΩ)
70
700
Fin temperature thermistor(RT64)
50
40
30
20
10
14
32 50 68 86
Temperature(°F)
104
160
Discharge temperature thermistor(RT62)
140
Resistance(kΩ)
80
Resistance(kΩ)
Jumper wire
for pre-heat
control setting
(JK)
180
90
0
-4
Jumper wire
for changing
defrost setting
(JS)
500
400
300
120
100
80
60
200
40
100
20
0
32
50
68
86 104 122 140 158 176 194 212 230 248
Temperature(°F)
28
0
32 50 68 86 104 122 140 158 176
Temperature(°F)
SUZ-KA18NA
Back side of unit
Smoothing
Bus-bar voltage
capacitor
DB61
(C63)
DC 260-325 V
(-)
(+)
Smoothing
capacitor
(C62)
AC 208/230 V
Smoothing
capacitor
(C61)
Fuse (F701)
T3.15 AL 250 V
R.V.coil
(CN721)
208/230 VAC
Fuse (F801)
250 V 3.15 A
Fuse (F901)
T3.15 AL 250 V
Output to
drive
compressor
(LDU, LDV,
LDW)
100
Defrost thermistor(RT61)
Ambient temperature thermistor(RT65)
Outdoor heat exchanger temperature thermistor(RT68)
200
60
600
Resistance(kΩ)
70
700
50
40
30
20
10
14
32 50 68 86
Temperature(°F)
104
Jumper wire for pre-heat
control setting (JK)
Jumper wire for changing
defrost setting (JS)
LED
160
Discharge temperature thermistor(RT62)
140
Resistance(kΩ)
80
Resistance(kΩ)
Fin temperature thermistor(RT64)
180
90
0
-4
LEV connector (CN724)
Signal of outdoor fan
motor (CN931)
Output to drive outdoor
fan motor (CN932)
Discharge temperature
thermistor /RT62
(CN641)
Defrost thermistor /
RT61(CN641)
Ambient temperature
thermistor /RT65
(CN643)
Outdoor heat exchanger
temperature thermistor
/RT68(CN644)
Front side of unit
Fin temperature
thermistor /RT64
(CN642)
AC 208/
230 V
500
400
300
120
100
80
60
200
40
100
20
0
32
50
68
86 104 122 140 158 176 194 212 230 248
Temperature(°F)
29
0
32 50 68 86 104 122 140 158 176
Temperature(°F)
11
FUNCTION SETTING
11-1. UNIT FUNCTION SETTING BY THE REMOTE CONTROLLER (S series only)
Each function can be set according to necessity using the remote controller. The setting of function for each unit can only be
done by the remote controller. Select function available from the table 1.
<Table 1> Function selections
(1) Functions available when setting the unit number to 00 (Select 00 referring to 4 setting the indoor unit number.)
Mode No.
Function
Settings
Wired remote
controller
(RF thermostat)
: Initial setting
Setting
Check
No. (when sent from the factory)
Remarks
1
01
Power failure
Not available
2
(101)
automatic recovery Available (Approx. 4-minute wait-period after power is restored.)
The setting
1
Indoor temperature Indoor unit’s internal sensor
is applied to
02
2
detecting
all the units
(—)
3
Data from main remote controller *1
in the same
1
Not supported
LOSSNAY
refrigerant
03
2
Supported (indoor unit dose not intake outdoor air through LOSSNAY)
connectivity
system.
(103)
3
Supported (indoor unit intakes outdoor air through LOSSNAY)
04
1
230V
Power supply
(104)
2
208V
voltage
1
15
2 [36°F] (Normal)
Frost prevention
2
(115)
3 [37°F]
temperature
*1 Can be set only when a wired remote controller is used.
When using 2 remote controllers (2-remote controller operation), the remote controller with built-in sensor must be set as a main remote
controller.
(2) Functions are available when setting the unit number to 01.
Function
Settings
Filter sign
External static pressure
100h
2500h
No filter sign indicator
5/15/35/50Pa
(0.02/0.06/0.14/0.20in.WG)
Set temp -4.5°F ON
Heater control *2
Set temp -1.8°F ON
Available
Set temperature in heating
mode *3
Not available
Fan speed during the
Extra low
heating thermo OFF
Stop
Set fan speed
Fan speed during the
Set fan speed
cooling thermo OFF
Stop
Detection of abnormality of Available
the pipe temperature (P8) Not available
Mode Setting
No. No.
: Initial setting
(Factory setting)
Ceiling conceald Ceiling cassette
SEZ-KD·NA4
1
07
2
(107)
3
08
(108) Refer to the table below
10
(110) Refer to the table below
1
23
(123) 2
1
24
(124) 2
1
25
2
(125) 3
1
27
(127) 2
1
28
(128) 2
*2 For the detail of Heater control, refer to the service manual of SEZ-KD·NA4.
*3 4 degC (7.2 degF) up
External static
pressure
5Pa (0.02in.WG)
15Pa (0.06in.WG)
35Pa (0.14in.WG)
50Pa (0.20in.WG)
Setting No.
: Initial setting
Mode No. 08 Mode No. 10 (Factory setting)
2
1
1
1
1
2
1
3
Check
30
SLZ-KA·NA
—
—
Check
11-1-1. Selecting functions using the wired remote controller
First, try to familiarize yourself with the flow of the function selection procedure. In this section, an example of setting the room
temperature detection position is given.
For actual operations, refer to steps to .
Setting number
Refrigerant address
Unit number
Mode number
Modes 01 to 14 can be activated
by pressing buttons and simultaneously, and modes 15 to
28 by pressing buttons and .
Selecting functions using the wired remote controller
Check the function selection setting.
Switch to function setting mode.
(Press and at the same time
with stop the remote controller.)
For modes 15 and higher
,
press and at the same time.
Specify refrigerant address 00 (outdoor unit).
Specify unit No. 00. (indoor unit)
(Use and .)
Enter the setting. (Specified indoor unit:
FAN operation)
(Press .)
YES
NO
Select mode No. 02
(room temperature detection position).
Select setting No. 03 (remote controller fixed).
(Use and .)
Enter the setting.
(Press .)
Finished
Example:
Selecting room temperature
detection position
Change refrigerant
address or unit No.
NO
YES
End function display.
(Press and at the same time.)
The above procedure must be carried out only if changes are necessary.
31
[Operating Procedure]
Check the function selection settings.
Changing the function selection settings for each mode will change its relevant mode function. Perform steps through to check all the function selection settings,
and write down the current settings in the Check column of the function selection <Table 1> in the chapter 11-1, and then change the settings as necessary.
For the initial settings, refer to the <Table 1> in the chapter 11-1. The following is the procedure to operate the remote controller internal sensor.
Turn off the remote controller.
Hold down 2 buttons simultaneously for 2 seconds: the and buttons to set the modes 01 through 14, and the and The “
Set the outdoor address.
Press the [ CLOCK] buttons (
and
address. The address changes from "00" to "15".
FUNCTION
SELECTION
) to select the desired
buttons to set the modes 15 through 28.
” will flash for a while and show “--” as below.
Address
display section
*If the FUNCTION
SELECTION and temperature displays flash “” for 2 seconds and stop flashing, this seems to be an error. Check for noise source or interference around the
transmission path.
Note: If the operation is made incorrectly before completion, finish operation by going to the step and restart from the step .
Press the
buttons(
and
) ) to indicate the indoor unit
No. in turn such as 00 → 02 → 03 → 04 → AL.
Select the unit No. to which the function selection applies.
Set the indoor unit No.
Press the button to flash “--“ in the unit No. display .
Unit number
display section
* To set the modes 01 through 06 or 15 through 22, select “00”.
* To set the modes 07 through 14 or 23 through 28,
select “01” or “02”.
When the address and unit number are confirmed by pressing the
Confirm the address and unit No.
Press the button to confirm the address and unit No.
After a while, the mode No. display will flash “--”.
MODE button, the corresponding indoor unit will start fan operation. This
helps you find the location of the indoor unit for which you want to perform function
selection.
Mode number
display section
Outdoor
unit
*If the temperature display flashes “88”, this indicates that the selected address
does not exist in the system. Or, if the unit No. shows “F” and the address flashes,
this indicates that the selected unit No. does not exist. In this case, set the correct
address and unit No. at the steps through .
Indoor unit
Confirm
Select the mode number.
Press the [
TEMP] buttons (
and
number.
(Only vaild mode numbers can be selected.)
MENU
Fan mode
Remote controller
Mode number
display section
) to select the desired mode
Mode number 02 = Indoor temperature detection
Select the setting No. in the selected mode.
Press the Main
Press the and
to select the desired setting No.
button to flash the applying setting
No. Check the current setting No. here.
Setting number display section
Setting number 1 = Indoor unit's internal sensor
Confirm the settings made at the steps through .
Setting number 3 = Remote controller's internal sensor
The mode No. and setting No. stop flashing to confirm the settings.
Press the button to flash the mode No. and setting No.,
and to start registration.
*If the mode No. or setting No. shows “---” and the temperature shows “
transmission path.
”, this seems to be a transmission error. Check for noise source or interference around the
To make additional settings in the FUNCTION SELECTION screen, repeat the steps through .
Note. After setting the modes 07 through 14, the modes 23 through 28 cannot be set continuously, or vice versa. In this case, after completing the settings for the
modes 07 through 14 or 23 through 28, go to the step 10 to finish setting, and restart setting from the step 1.
At this point, wait for 30 seconds or more before restarting setting. Otherwise, the temperature may indicate “”.
Exit the Function Selection screen.
Hold down 2 buttons simultaneously for 2 seconds or more: the FILTER and
TEST buttons for the modes 01 through 14, and the and TEST
buttons for the modes 15 through 28.
After a few seconds the Function Selection screen returns to the OFF screen.
32
Note: When changing the initial settings in the FUNCTION SELECTION screen, be sure to write down the changes by putting a circle in the
12
DISASSEMBLY INSTRUCTIONS
<"Terminal with locking mechanism" Detaching points>
The terminal which has the locking mechanism can be detached as shown below.
There are two types (refer to (1) and (2)) of the terminal with locking mechanism.
The terminal without locking mechanism can be detached by pulling it out.
Check the shape of the terminal before detaching.
(1) Slide the sleeve and check if there is a locking lever or not.
Sleeve
Locking lever
SUZ-KA09NA
(2) The terminal with this connector has the
locking mechanism.
Slide the sleeve.
Pull the terminal while
pushing the locking
lever.
SUZ-KA12NA
Hold the sleeve, and
pull out the terminal
slowly.
Connector
SUZ-KA15NA
NOTE: Turn OFF power supply before disassembling.
OPERATING PROCEDURE
PHOTOS
1. Removing the cabinet
Photo 1
(1)
(2)
(3)
(4)
(5)
Remove the screw fixing the service panel.
Pull down the service panel and remove it.
Remove the screws fixing the conduit cover.
Remove the conduit cover.
Disconnect the power supply wire and indoor/outdoor
connecting wire.
(6) Remove the screws fixing the top panel.
(7) Remove the top panel.
(8) Remove the screws fixing the cabinet.
(9) Remove the cabinet.
(10) Remove the screws fixing the back panel.
(11) Remove the back panel.
Screws
of the top
panel
Screw of the
cabinet
Screws of
the top panel
Back
panel
Screw of
the service
panel
Photo 2
Hooks
Screw of the
conduit cover
Screws of
the cabinet
Conduit cover
Conduit plate
33
Service
panel
OPERATING PROCEDURE
PHOTOS
2. Removing the inverter assembly, inverter P.C. board
(1) Remove the cabinet and panels. (Refer to procedure 1.)
(2) Disconnect the lead wire to the reactor and the following
connectors:
<Inverter P.C. board>
CN721 (R.V. coil)
CN931, CN932 (Fan motor)
CN641 (Defrost thermistor and discharge temperature thermistor)
CN643 (Ambient temperature thermistor)
CN644 (Outdoor heat exchanger temperature thermistor)
CN724 (LEV)
(3) Remove the compressor connector (CN61).
(4) Remove the screws fixing the relay panel. (See Photo 3)
(5) Remove the inverter assembly. (See Photo 4)
(6) Remove the screw of the ground wire and screw of the
T.B.support. (See Photo 4)
(7) Remove the relay panel from the inverter assembly.
(8) Remove the inverter P.C. board from the relay panel.
Photo 3
Screws of the
relay panel
Photo 4 (Inverter assembly)
Heatsink
Inverter
P.C. board
Screw of the
T.B.support
T.B.support
3. Removing R.V. coil
(1) Remove the cabinet and panels. (Refer to procedure 1.)
(2) Disconnect the following connectors:
<Inverter P.C. board>
CN721 (R.V. coil)
(3) Remove the R.V. coil. (See Photo 5)
Relay panel
4. Removing the discharge temperature thermistor,
defrost thermistor, outdoor heat exchanger temperature thermistor and ambient temperature thermistor
(1) Remove the cabinet and panels. (Refer to procedure 1.)
(2) Disconnect the lead wire to the reactor and the following
connectors:
<Inverter P.C. board>
CN641 (Defrost thermistor and discharge temperature thermistor)
CN643 (Ambient temperature thermistor)
CN644 (Outdoor heat exchanger temperature thermistor)
(3) Pull out the discharge temperature thermistor from its holder.
(See Photo 5)
(4) Pull out the defrost thermistor from its holder. (See Photo 6)
(5) Pull out the outdoor heat exchanger temperature thermistor
from its holder. (See Photo 6)
(6) Pull out the ambient temperature thermistor from its holder.
34
Photo 5
Screw of the
ground wire
R.V. coil
Discharge temperature thermistor
OPERATING PROCEDURE
PHOTOS
Photo 6
5. Removing outdoor fan motor
(1) Remove the cabinet and panels. (Refer to procedure 1.)
(2) Disconnect the following connectors:
<Inverter P.C. board>
CN931, CN932 (Fan motor)
(3) Remove the propeller nut. (See Photo 7)
(4) Remove the propeller. (See Photo 7)
(5) Remove the screws fixing the fan motor. (See Photo 7)
(6) Remove the fan motor.
Outdoor heat exchanger
temperature thermistor
6. Removing the compressor and 4-way valve
(1) Remove the cabinet and panels. (Refer to procedure 1.)
(2) Remove the inverter assembly. (Refer to procedure 2.)
(3) Recover gas from the refrigerant circuit.
NOTE: Recover gas from the pipes until the pressure
gauge shows 0 PSIG.
Defrost thermistor
Photo 7
Screws of the outdoor fan motor
(4) Detach the welded part of the suction and the discharge
pipe connected with compressor.
(5) Remove the nuts of compressor legs.
(6) Remove the compressor.
(7) Detach the welded part of pipes connected with 4-way
valve. (See Photo 8.)
Propeller
Propeller nut
Photo 8
Welded parts of 4-way valve
35
11-2. SUZ-KA18NA
NOTE: Turn OFF power supply before disassembling.
OPERATING PROCEDURE
PHOTOS
1. Removing the cabinet
Photo 1
(1)
(2)
(3)
(4)
(5)
(6)
(7)
Remove the screws of the service panel.
Remove the screws of the top panel.
Remove the screw of the valve cover.
Remove the service panel.
Remove the top panel.
Remove the valve cover.
Disconnect the power supply and indoor/outdoor connecting wire.
(8) Remove the screws of the cabinet.
(9) Remove the cabinet.
(10) Remove the screws of the back panel.
(11) Remove the back panel.
Screw of the top panel
Screws of the cabinet
Screws of
the cabinet
Screws of the back panel
Photo 2
Screw of the top panel
Screws
of the
cabinet
Screw
of the
service
panel
Screw of
the valve
cover
36
Screws of
the back
panel
OPERATING PROCEDURE
PHOTOS
2. Removing the inverter assembly, inverter P.C. board
Photo 3
Screws of the relay panel
(1) Remove the cabinet and panels. (Refer to procedure 1.)
(2) Disconnect the lead wire to the reactor and the following connectors:
<Inverter P.C. board>
CN721 (R.V.coil)
CN931, CN932 (Fan motor)
CN641 (Defrost thermistor and discharge temperature thermistor)
CN643 (Ambient temperature thermistor)
CN644 (Outdoor heat exchanger temperature thermistor)
CN724 (LEV)
(3) Remove the compressor connector (CN61).
(4) Remove the screws fixing the relay panel. (See Photo 3)
(5) Remove the inverter assembly. (See Photo 4)
(6) Remove the screw of the ground wire and screw of the
T.B.support. (See Photo 4)
(7) Remove the screw of the PB fixture.
(8) Remove the relay panel from the PB support.
(9) Remove the inverter P.C. board from the inverter assembly.
Screws of
the reactor
Photo 4 (Inverter assembly)
Hook of the
PB support
3. Removing R.V. coil
(1) Remove the cabinet and panels. (Refer to procedure 1.)
(2) Disconnect the following connectors:
<Inverter P.C. board>
CN721 (R.V. coil)
(3) Remove the R.V. coil. (See Photo 5)
Inverter P.C.
board
Heatsink
Screw of the
T.B.support
PB support
T.B.support
Screw of the
ground wire
Relay panel
Hook of the
PB support
Photo5
Screw of the
PB fixture
R.V. coil
Welded parts of 4-way valve
37
OPERATING PROCEDURE
PHOTOS
4. Removing the discharge temperature thermistor,
defrost thermistor, outdoor heat exchanger temperature thermistor and ambient temperature thermistor
(1) Remove the cabinet and panels. (Refer to procedure 1.)
(2) Disconnect the lead wire to the reactor and the following
connectors:
<Inverter P.C. board>
CN641 (Defrost thermistor and discharge temperature thermistor)
CN643 (Ambient temperature thermistor)
CN644 (Outdoor heat exchanger temperature thermistor)
(3) Pull out the discharge temperature thermistor from its holder. (See Photo 8)
(4) Pull out the defrost thermistor from its holder. (See Photo 6)
(5) Pull out the outdoor heat exchanger temperature thermistor
from its holder. (See Photo 6)
(6) Pull out the ambient temperature thermistor from its holder.
(See Photo 6)
Photo 6
Outdoor heat
exchanger temperature
thermistor
Ambient temperature
thermistor
5. Removing outdoor fan motor
(1) Remove the top panel, cabinet and service panel. (Refer to
procedure 1.)
(2) Disconnect the following connectors:
<Inverter P.C. board>
CN931 and CN932 (Fan motor)
(3) Remove the propeller.
(4) Remove the screws fixing the fan motor.
(5) Remove the fan motor.
Defrost thermistor
Photo 7
Screws of
the outdoor
fan motor
6. Removing the compressor and 4-way valve
(1) Remove the top panel, cabinet and service panel. (Refer to
procedure 1.)
(2) Remove the back panel. (Refer to procedure 1.)
(3) Remove the inverter assembly. (Refer to procedure 2.)
(4) Recover gas from the refrigerant circuit.
NOTE: Recover gas from the pipes until the pressure gauge
shows 0 PSIG.
(5) Detach the welded part of the suction and the discharge
pipe connected with compressor.
(6) Remove the compressor nuts.
(7) Remove the compressor.
(8) Detach the welded part of 4-way valve and pipe. (See
Photo 5)
Photo 8
Welded part of the
discharge pipe
Discharge temperature
thermistor
Welded part of the
suction pipe
38
39
HEAD OFFICE : TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN
CCopyright 2010 MITSUBISHI ELECTRIC ENGINEERING CO., LTD.
Distributed in Jul.2011 No.OCH467 REVISED EDITION-A
Distributed in Jan.2010 No.OCH467 PDF 4
Made in Japan
New publication, effective Jul. 2011
Specifications subject to change without notice