Page 1
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
SERVICE MANUAL
R410A
Outdoor unit
[Model Name]
SUZ-KA09NA2
SUZ-KA09NAH2
[Service Ref.]
SUZ-KA09NA2.MX
SUZ-KA09NAH2.MX
December 2018
No. OCH699
HFC
utilized
R410A
Note:
This service manual describes
service data of the outdoor units
only.
SUZ-KA12NA2
SUZ-KA12NAH2
SUZ-KA15NA2
SUZ-KA15NAH2
SUZ-KA09NA(H)2.MX
SUZ-KA12NA2.MX
SUZ-KA12NAH2.MX
SUZ-KA15NA2.MX
SUZ-KA15NAH2.MX
Air inlet
(back and side)
Piping
Air outlet
Drain hose
Drain outlet
CONTENTS
1.
COMBINATION OF INDOOR AND OUTDOOR UNITS
2. PART NAMES AND FUNCTIONS
3. SPECIFICATION
4. OUTLINES AND DIMENSIONS
5. WIRING DIAGRAM
6. REFRIGERANT SYSTEM DIAGRAM
7. DATA
8. ACTUATOR CONTROL
9. SERVICE FUNCTION
10. TROUBLESHOOTING
11. FUNCTION SETTING
12. DISASSEMBLY INSTRUCTIONS
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PARTS CATALOG (OCB699)
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13
13
29
32
2
2
3
4
5
9
Page 2
1
Heat pump without
electric heater
COMBINATION OF INDOOR AND OUTDOOR UNITS
Outdoor unit
—
Heat pump type
SUZ-
KA12
NA(H)2.MX
KA15
NA(H)2.MX
—
—
Indoor unit
Service Ref.
SLZ-KF09/12/15NA.TH
SEZ-KD09/12/15NA4R1.TH
PEAD-A09/12/15AA7.MX
SVZ-KP12NA.MX
MLZ-KP09/12NA-U1
Service
Manual No.
OCH699
HWE08020
HWE1608A
OBH802
KA09
NA(H)2.MX
2
PART NAMES AND FUNCTIONS
SUZ-KA09NA(H)2.MX SUZ-KA12NA(H)2.MX SUZ-KA15NA(H)2.MX
Air inlet
(back and side)
Piping
Air outlet
Drain hose
Drain outlet
OCH699
2
Page 3
3
Outdoor unit model SUZ-KA09NA(H)2 SUZ-KA12NA(H)2 SUZ-KA15NA(H)2
Power supply V , phase , Hz 208/230 , 1 , 60
Max. fuse size (time delay) A 15
Min. circuit ampacity A 9 9 10
Fan motor F.L.A 0.50
Compressor
Refrigerant control Linear expansion valve
Sound level
Defrost method Reverse cycle
Dimensions
Weight Ib 81
External nish Munsell 3Y 7.8/1.1
Control voltage
Refrigerant piping Not supplied
Refrigerant pipe size
(Min. wall thickness)
Connection method
Between the indoor
& outdoor units
Refrigerant charge (R410A) 2 lb 5 oz 2 lb 9 oz
Note: Test conditions are based on AHRI 210/240.
Rating conditions (Cooling) — Indoor: 80˚F D.B., 67˚F W.B., Outdoor: 95˚F D.B., (75˚F W.B.)
(Heating) — Indoor: 70˚F D.B., 60˚F W.B., Outdoor: 47˚F D.B., 43˚F W.B.
SPECIFICATION
Model
R.L.A 6.2 6.6 7.4
L.R.A 7.7 8.2 9.3
Refrigeration oil oz(L)/
(Model)
1
*
Cooling dB(A) 48 49 49
Heating dB(A) 50 51 51
W in 31-1/2
D in 11-1/4
H in 21-5/8
(by built-in transformer)
Liquid in 1/4 (0.0315)
Gas in 3/8 (0.0315) 1/2 (0.0315)
Indoor Flared
Outdoor Flared
Height difference ft 40
Piping length ft 65
VDC 12 - 24
KNB073FRVMC SNB092FQAMT SNB130FQBMT
9.1(0.27)/(FV50S) 11.8(0.35)/(FV50S) 11.8(0.35)/(FV50S)
OPERATING RANGE
(1) POWER SUPPLY
Outdoor unit
OCH699
Rated voltage Guaranteed voltage (V)
208/230 V
1 phase
60 Hz
Min. 187
208 230 Max. 253
3
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4
OUTLINES AND DIMENSIONS
SUZ-KA09NA(H)2.MX SUZ-KA12NA(H)2.MX SUZ-KA15NA(H)2.MX
REQUIRED SPACE
*1
4 in. (100 mm) or more when
front and sides of the unit are clear
4 in. (100 mm)
or more
(KA09/12/15NA)
(KA09/12/15NAH)
8 in. (200 mm)
or more *2
*2
When any 2 sides of left, right
and rear of the unit are clear
holes
clear *1
4 in. (100 mm)
14 in. (350 mm)
or more
Unit: inch(mm)
or more
Liquid refrigerant pipe joint
Refrigerant pipe (flared)
Gas refrigerant pipe joint
Refrigerant pipe (flared)
Ø 1/4
Ø 3/8 (KA09/12)
Ø 1/2 (KA15)
OCH699
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Page 5
5
SUZ-KA09NA2.MX SUZ-KA12NA2.MX
WIRING DIAGRAM
OCH699
5
Page 6
SUZ-KA09NAH2.MX SUZ-KA12NAH2.MX
OCH699
6
Page 7
SUZ-KA15NA2.MX
OCH699
7
Page 8
SUZ-KA15NAH2.MX
OCH699
8
Page 9
6
REFRIGERANT SYSTEM DIAGRAM
SUZ-KA09NA(H)2.MX SUZ-KA12NA(H)2.MX SUZ-KA15NA(H)2.MX
Refrigerant pipe ø3/8 (ø9.52) (KA09/12)
(with heat insulator)
Flared connection
Flared connection
Refrigerant pipe ø1/4 (ø6.35)
(with heat insulator)
ø1/2 (ø12.7) (KA15)
Muffler
Stop valve
(with service port)
Capillary tube
O.D. 0.118 ×
I.D. 0.079 × 9-7/16
ø3.0 × ø2.0 × 240
(
(KA09)
Capillary tube
O.D. 0.157 ×
I.D. 0.094 × 9-7/16
ø4.0 × ø2.4 × 240
(
(KA12/15
Stop valve
(with strainer)
Service
port
)
4-way valve
Discharge
temperature
thermistor
RT62
)
LEV
)
Muffler
Service
port
Compressor
Defrost
thermistor
RT61
Capillary tube
O.D. 0.118 ×
I.D. 0.079 × 8-9/32
(ø3.0 × ø2.0 × 210)
Refrigerant flow in cooling
Refrigerant flow in heating
Outdoor
heat
exchanger
Strainer
#100
R.V. coil
heating ON
cooling OFF
Outdoor heat
exchanger
temperature
thermistor
RT68
Ambient
temperature
thermistor
RT65
Unit: Inch (mm)
MAX. REFRIGERANT PIPING LENGTH and MAX. HEIGHT DIFFERENCE
Refrigerant piping: ft Piping size O.D: in
Model
SUZ-KA
09/12/15NA(H)2
Max. Length
Max. Height difference
A
65 40
Indoor
unit
Max. Height
difference
B
B
Max. Length
A
Gas Liquid
3/8 (KA09/12)
1/2 (KA15)
Outdoor unit
ADDITIONAL REFRIGERANT CHARGE (R410A: oz)
Refrigerant piping exceeding 25 ft requires additional refrigerant charge according to the calculation.
Model
Outdoor unit
precharged
SUZ-KA09NA(H)2 2 lb 5 oz
SUZ-KA15NA(H)2
2 lb 9 oz
25 30 40 50 60 65
0 1.08 2.16 3.24 4.32 5.4SUZ-KA12NA(H)2
Refrigerant piping length (one way): ft
Calculation: X oz = 1.08/5 oz / ft × (Refrigerant piping length (ft) - 25)
1/4
OCH699
9
Page 10
7 DATA
STANDARD OPERATION DATA
Representative matching SEZ-KD09NA4 SEZ-KD12NA4 SEZ-KD15NA4
Item Unit Cooling Heating Cooling Heating Cooling Heating
Capacity BTU/h 9000 12000 12000 15000 15000 18000
SHF - 0.82 — 0.82 — 0.86 —
Total
Input kW 0.7 1.1 0.93 1.33 1.15 1.44
Indoor unit SEZ-KD09NA4 SEZ-KD12NA4 SEZ-KD15NA4
Power supply (V, phase, Hz) 230, 1, 60
Input kW 0.06 0.04 0.07 0.05 0.09 0.07
Current A 0.5 0.39 0.57 0.46 0.74 0.63
Outdoor unit SUZ-KA09NA(H)2 SUZ-KA12NA(H)2 SUZ-KA15NA(H)2
Power supply (V, phase, Hz) 230, 1, 60
Electrical circuit
Input kW 0.64 1.06 0.86 1.28 1.06 1.37
Current A 2.89 4.64 3.47 5.29 4.24 5.63
Condensing pressure
Suction pressure
Discharge temperature °F 160 169 167 168 166 167
Condensing temperature °F 109 114 114 124 119 11 4
Suction temperature °F 63 36 66 31 55 31
Ref. pipe length ft 25
Refrigerant circuit
Refrigerant charge (R410A) - 1.05 1.15 1.15
Intake air temperature
unit
Indoor
Discharge air temperature DB °F 59 104 57 105 57 101
Intake air temperature
unit
Outdoor
PSIG
PSIG
DB °F 80 70 80 70 80 70
WB °F 67 60 67 60 67 60
DB °F 95 47 95 47 95 47
WB °F 75 43 75 43 75 43
358 473 387 441 415 386
133 110 147 99 141 99
Representative matching SLZ-KF09NA SLZ-KF12NA SLZ-KF15NA
Item Unit Cooling Heating Cooling Heating Cooling Heating
Capacity BTU/h 9000 11000 12000 13000 14100 18000
SHF - 0.87 — 0.74 — 0.75 —
Total
Input kW 0.67 0.81 0.9 1.31 1.15 1.73
Indoor unit SLZ-KF09NA SLZ-KF12NA SLZ-KF15NA
Power supply (V, phase, Hz) 230, 1, 60
Input kW 0.02 0.02 0.02 0.02 0.03 0.03
Current A 0.2 0.15 0.24 0.19 0.32 0.27
Outdoor unit SUZ-KA09NA(H)2 SUZ-KA12NA(H)2 SUZ-KA15NA(H)2
Power supply (V, phase, Hz) 230, 1, 60
Electrical circuit
Input kW 0.65 0.79 0.88 1.29 1.12 1.7
Current A 2.67 3.34 3.67 5.48 4.82 7.38
Condensing pressure
Suction pressure
Discharge temperature °F 159 167 167 159 168 191
Condensing temperature °F 108 115 115 131 116 131
Suction temperature °F 56 40 62 33 54 32
Ref. pipe length ft 25
Refrigerant circuit
Refrigerant charge (R410A) - 1.05 1.15 1.15
Intake air temperature
unit
Indoor
Discharge air temperature DB °F 57 103 56 105 57 11 2
Intake air temperature
unit
Outdoor
PSIG
PSIG
DB °F 80 70 80 70 80 70
WB °F 67 60 67 60 67 60
DB °F 95 47 95 47 95 47
WB °F 75 43 75 43 75 43
358 393 391 483 397 490
131 113 142 104 127 101
OCH699
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Page 11
Representative matching PEAD-A09AA7 PEAD-A12AA7 PEAD-A15AA7
Item Unit Cooling Heating Cooling Heating Cooling Heating
Capacity BTU/h 9000 12000 12000 15000 15000 18000
SHF - 0.9 — 0.9 — 0.9 —
Total
Input kW 0.72 0.9 0.93 1.16 1.15 1.35
Indoor unit PEAD-A09AA7 PEAD-A12AA7 PEAD-A15AA7
Power supply (V, phase, Hz) 230, 1, 60
Input kW 0.07 0.05 0.09 0.07 0.11 0.09
Current A 0.54 0.43 0.67 0.56 0.95 0.84
Outdoor unit SUZ-KA09NA(H)2 SUZ-KA12NA(H)2 SUZ-KA15NA(H)2
Power supply (V, phase, Hz) 230, 1, 60
Electrical circuit
Input kW 0.65 0.85 0.84 1.09 1.04 1.26
Current A 2.55 3.48 3.36 4.45 4.01 5.01
Condensing pressure
Suction pressure
Discharge temperature °F 157 162 167 175 165 167
Condensing temperature °F 108 113 113 111 119 105
Suction temperature °F 57 38 49 40 57 38
Ref. pipe length ft 25
Refrigerant circuit
Refrigerant charge (R410A) - 1.05 1.15
Intake air temperature
unit
Indoor
Discharge air temperature DB °F 58 103 59 100 58 99
Intake air temperature
unit
Outdoor
PSIG
PSIG
DB °F 80 70 80 70 80 70
WB °F 67 60 67 60 67 60
DB °F 95 47 95 47 95 47
WB °F 75 43 75 43 75 43
358 380 383 374 412 343
133 111 153 93 144 97
Representative matching SVZ-KP12NA MLZ-KP09NA MLZ-KP12NA
Item Unit Cooling Heating Cooling Heating Cooling Heating
Capacity BTU/h 12000 11000 9000 12000 12000 15400
SHF - 0.89 — 0.82 — 0.74 —
Total
Input kW 0.94 1.24 0.71 0.86 0.96 1.3
Indoor unit SVZ-KP12NA MLZ-KP09NA MLZ-KP12NA
Power supply (V, phase, Hz) 230, 1, 60 230, 1, 60
Input kW 0.1 0.04
Current A 0.9 0.3
Outdoor unit SUZ-KA12NA(H)2 SUZ-KA09NA(H)2 SUZ-KA12NA(H)2
Power supply (V, phase, Hz) 230, 1, 60 230, 1, 60
Electrical circuit
Input kW 0.84 1.11 0.67 0.82 0.92 1.26
Current A 3.18 4.33 2.77 3.4 3.92 5.32
Condensing pressure
Suction pressure
Discharge temperature °F 167 170 158 162 165 172
Condensing temperature °F 11 3 111 108 105 96 109
Suction temperature °F 70 41 56 41 65 37
Ref. pipe length ft 25 25
Refrigerant circuit
Refrigerant charge (R410A) - 1.05 1.05 1.15
Intake air temperature
unit
Indoor
Discharge air temperature DB °F 59 100 57 104 57 111
Intake air temperature
unit
Outdoor
PSIG
PSIG
DB °F 80 70 80 70 80 70
WB °F 67 60 67 60 67 60
DB °F 95 47 95 47 95 47
WB °F 75 43 75 43 75 43
384 374 355 344 372 437
153 96 130 108 137 98
OCH699
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Page 12
5 seconds 15 seconds
8
8-1. OUTDOOR FAN MOTOR CONTROL
ACTUATOR 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.
ON
Compressor
OFF
ON
Outdoor fan
motor
OFF
8-2. R.V. COIL CONTROL
Heating
Cooling
Dry
NOTE: The 4-way valve reverses for 5 seconds right before start-up of the compressor.
8-3. RELATION BETWEEN MAIN SENSOR AND ACTUATOR
Discharge temperature
thermistor
Indoor coil temperature
thermistor
Defrost thermistor Heating: Defrosting
Fin temperature thermistor Protection
Ambient temperature
thermistor
Outdoor heat exchanger temperature thermistor
*. SUZ-KA▪NAH2 only.
.................
.................
....................
Compressor
R.V.coil
Outdoor fan
motor
Sensor Purpose
ON
OFF
OFF
<COOL>
ON
OFF
ON
OFF
ON
OFF
Protection
Cooling: Coil frost prevention
Heating: High pressure protec-
tion
Cooling: Low ambient temperature operation
Heating: Defrosting (Heater)
Cooling: Low ambient temperature operation
Cooling: High pressure protection
5 seconds
<HEAT>
5 seconds
Compressor
LEV
○ ○
○
○ ○
○ ○ ○ ○ ○
○ ○
○ ○ ○
○ ○ ○
○ ○ ○
Actuator
Outdoor fan
motor
R.V.coil
Indoor fan
motor
Defrost
heater *
○
OCH699
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Page 13
9
SERVICE FUNCTION
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. TEST POINT DIAGRAM AND VOLTAGE".)
Jumper
(Initial setting)
JS
Soldered
None
(Cut)
Defrost nish temperature
SUZ-KA09/12/15
41°F (5°C)
50°F (10°C)
9-2. PRE-HEAT CONTROL SETTING
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 the discharge temperature is 68°F
or below. When the pre-heat control turns ON, the compressor is energized. (About 50 W)
(20°C)
Pre-heat control setting
<JK>
ON: To activate the pre-heat control, cut JK wire of the inverter P.C. board.
OFF: To deactivate the pre-heat control, solder JK wire of the inverter P.C. board.
(Refer to 10-6.1.)
Jumper Pre-heat control setting
Soldered
JK
Cut Activated
NOTE: When the inverter P.C. board is replaced, check the Jumper wires, and cut/solder them if necessary.
10
TROUBLESHOOTING
Deactivated
(Factory setting)
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
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. TROUBLESHOOTING CHECK TABLE" and "10-3. HOW TO PROCEED "SELF-DIAGNOSIS"".
OCH699
13
Housing point
Page 14
temperature thermistor, outdoor heat exchanger temperature
No. Symptoms
Abnormal point/ Condition
RemedyCondition
Outdoor unit
does not op-
erate.
1-time flash
every
2.5 seconds
Outdoor power sys-
tem
Overcurrent protection cut-out operates 3 consecutive times
within 1 minute after the compressor gets started.
Reconnect connector of compressor.
Refer to “10-5. How to check in-
verter/compressor".
Check stop valve.
•
•
•
Outdoor thermistors Discharge temperature thermistor shorts, or opens during
compressor running.
defrost thermistor, P.C. board
thermistor or ambient temperature thermistor shorts, or opens
during compressor running.
Refer to “10-5.F Check of outdoor
thermistors".
•
Outdoor control system
Nonvolatile memory data cannot be read properly.
Replace inverter P.C. board. •
6-time flash
2.5 seconds
OFF
Serial signal The communication fails between the indoor and outdoor unit
for 3 minutes.
11-time flash
2.5 seconds OFF
Stop valve/
Closed valve
Closed valve is detected by compressor current. Check stop valve.
•
•
'Outdoor unit
stops and
restarts 3
minutes later'
is repeated.
2-time flash
2.5 seconds OFF
Overcurrent protec-
tion
Large current flows into intelligent power module.
Reconnect connector of compressor.
Refer to “10-5. How to check in-
verter/compressor".
Check stop valve.
•
•
•
3-time flash
2.5 seconds OFF
Discharge tempera-
ture overheat pro-
tection
Temperature of discharge temperature thermistor exceeds
116°C, compressor stops. Compressor can restart if discharge
temperature thermistor reads 100°C or less 3 minutes later.
Check refrigerant circuit and refrig-
erant amount.
Refer to “10-5. k Check of LEV".
•
•
4-time flash
2.5 seconds OFF
Fin temperature
/P.C. board tem-
perature thermistor
overheat protection
Temperature of fin temperature thermistor on the heat sink
exceeds 72 to 86°C or temperature of P.C. board temperature
thermistor on the inverter P.C.board exceeds 72 to 85°C.
Check around outdoor unit.
Check outdoor unit air passage.
Refer to “10-5. Check of outdoor
fan motor".
•
•
•
5-time flash
2.5 seconds OFF
High pressure pro-
tection
Indoor coil thermistor exceeds 70°C in HEAT mode. Defrost
thermistor exceeds 70°C in COOL mode.
Check refrigerant circuit and refrig-
erant amount.
Check stop valve.
•
•
8-time flash
2.5 seconds OFF
Compressor syn-
chronous abnormal-
ity
The waveform of compressor current is distorted.
Reconnect connector of compressor.
Refer to “10-5. How to check in-
verter/compressor".
•
•
10-time flash
2.5 seconds OFF
Outdoor fan motor Outdoor fan has stopped 3 times in a row within 30 seconds
after outdoor fan start-up.
Refer to “10-5. Check of outdoor
fan motor.
Refer to “10-5. Check of inverter
P.C. board.
•
•
12-time flash
2.5 seconds OFF
Each phase current
of compressor
Each phase current of compressor cannot be detected nor-
mally.
Refer to “10-5
. L
verter/compressor".
•
13-time flash
2.5 seconds OFF
DC voltage DC voltage of inverter cannot be detected normally. Refer to “10-5
. How to check in-
verter/compressor".
•
Outdoor unit
operates.
1-time flash
2.5 seconds OFF
Frequency drop by
current protection
When the input current exceeds approximately 7A(KA25)/
8A(KA35)/12A(KA50)14A(KA60)/16A(KA71), compressor
The unit is normal, but check the
following.
Check if indoor filters are clogged.
Check if refrigerant is short.
Check if indoor/outdoor unit air
circulation is short cycled.
•
•
•
3-time flash
2.5 seconds OFF
Frequency drop by
high pressure pro-
tection
Temperature of indoor coil thermistor exceeds 131 °F [55 °C]
in HEAT
mode, compressor frequency lowers.
Frequency drop by
defrosting in COOL
mode
Indoor coil thermistor reads 46 °F [8 °C] or less in COOL
mode, com
pressor frequency lowers.
4-time flash
2.5 seconds OFF
Frequency drop by
discharge tempera-
ture protection
Temperature of discharge temperature thermistor exceeds
232 °F [111 °C], compressor frequency lowers.
Check refrigerant circuit and refrig-
erant amount.
Refer to “10-5. Check of LEV".
Refer to “10-5. Check of outdoor
thermistors".
•
•
•
7-time flash
2.5 seconds OFF
Low discharge tem-
perature protection
Temperature of discharge temperature thermistor has been
122 °F [50 °C] or less for 20 minutes.
Refer to “10-5. Check of LEV".
Check refrigerant circuit and refrig-
erant amount.
•
•
8-time flash
2.5 seconds OFF
PAM protection
PAM: Pulse Ampli-
tude Modulation
The overcurrent flows into IGBT (Insulated Gate Biopolar tran-
sistor: TR821) or the bus-bar voltage reaches 320 V or more,
PAM
stops and restarts.
This is not malfunction. PAM pro-
tection will be activated in the fol-
lowing cases:
1. Instantaneous power voltage
drop. (Short time power failure)
2. When the power supply voltage
is high.
9-time flash
2.5 seconds OFF
Inverter check mode The connector of compressor is disconnected, inverter check
mode starts.
Check if the connector of the com-
pressor is correctly connected.
Refer to “10-5. How to check
inverter/compressor".
•
NOTE: 1. The location of LED is illustrated at the right figure. Refer to "10-6. TEST POINT DIAGRAM".
Inverter P.C. board
•
I
I
L
K
G
K
•
Check indoor/outdoor connecting wire.
Replace indoor or outdoor P.C.
board if abnormality is displayed
again.
Zero cross detecting
circuit
Zero cross signal for PAM control cannot be detected.
LED
indication
check
code
UP
U3
U4
FC
E8
E9
UE
Fin temperature thermistor,
/
frequency lowers.
How to check in-
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
A
10-2. TROUBLE SHOOTING CHECK TABLE
SUZ-KA09NA(H)2.MX SUZ-KA12NA(H)2.MX SUZ-KA15NA(H)2.MX
check
No. Symptoms
Outdoor
unit does not
1
operate.
2
3
4
5
6
'Outdoor unit
stops and
7
restarts
8
9
10
11
12
3 minutes
later' is
repeated.
13
14
Outdoor unit
15
operates.
16
17
18
LED
indication
1-time blink
every
2.5 seconds
6-time blink
2.5 seconds
OFF
11-time
blink
2.5 seconds
OFF
16-time
blink
2.5 seconds
OFF
2-time blink
2.5 seconds OFF
3-time blink
2.5 seconds OFF
4-time blink
2.5 seconds OFF
5-time blink
2.5 seconds OFF
8-time blink
2.5 seconds OFF
10-time blink
2.5 seconds OFF
12-time blink
2.5 seconds OFF
13-time blink
2.5 seconds OFF
1-time blink
2.5 seconds OFF
3-time blink
2.5 seconds OFF
4-time blink
2.5 seconds OFF
7-time blink
2.5 seconds OFF
8-time blink
2.5 seconds OFF
19
20
2. LED is lighted during normal operation.
The blinking frequency shows the number of times the LED blinks after every 2.5-second OFF.
(Example) When the blinking frequency is “2”.
9-time blink
2.5 seconds OFF
Abnormal point/ Condition
code
Outdoor power system
UP
Outdoor thermistors
U3
U4
Outdoor control system
FC
Serial signal
E8
E9
Stop valve/Closed valve
UE
Overcurrent protection cut-out operates 3 consecutive times
within 1 minute after the compressor gets started.
Discharge temperature thermistor shorts, or opens during compressor running.
Fin temperature thermistor, defrost thermistor, P.C. board
temperature thermistor, outdoor heat exchanger
temperature thermistor or ambient temperature thermistor
shorts, or opens during compressor running.
Nonvolatile memory data cannot be read properly. ▪Replace inverter P.C. board.
The communication fails between the indoor and outdoor unit for
3 minutes.
Closed valve is detected by compressor current. ▪Check stop valve.
Condition Remedy
PL Outdoor refrigerant
system abnormality
Overcurrent protection
Discharge temperature
overheat protection
Fin temperature/P.C.
board temperature thermistor overheat protection
High pressure protection
Compressor synchronous
abnormality
Outdoor fan motor
Each phase current
of compressor
DC voltage
Frequency drop by
current protection
Frequency drop by
high pressure protection
Frequency drop by
defrosting in COOL mode
Frequency drop by
discharge temperature
protection
Low discharge temperature protection
PAM protection
PAM: Pulse Amplitude
Modulation
Zero cross detecting
circuit
Inverter check mode
A closed valve and air trapped in the refrigerant circuit are
detected based on the temperature sensed by the indoor and
outdoor thermistors and the current of the compressor.
Large current ows into intelligent power module. ▪Reconnect connector of compressor.
Temperature of discharge temperature thermistor exceeds
116°C, compressor stops. Compressor can restart if discharge
temperature thermistor reads 100°C or less 3 minutes later.
Temperature of fin temperature thermistor on the heat sink
exceeds 72 to 86°C or temperature of P.C. board temperature
thermistor on the inverter P.C.board exceeds 72 to 85°C.
Indoor coil thermistor exceeds 70°C in HEAT mode. Defrost
thermistor exceeds 70°C in COOL mode.
The waveform of compressor current is distorted. ▪Reconnect connector of compressor.
Outdoor fan has stopped 3 times in a row within 30 seconds
after outdoor fan start-up.
Each phase current of compressor cannot be detected normally. ▪Refer to “10-5.LCheck of inverter P.C. board”.
DC voltage of inverter cannot be detected normally. ▪Refer to “10-5.AHow to check inverter/
When the input current exceeds approximately
7A(KA09)/8A(KA12)/9A(KA15), compressor
Temperature of indoor coil thermistor exceeds 131 °F [55 °C] in
HEAT mode, compressor frequency lowers.
Indoor coil thermistor reads 46 °F [8 °C] or less in COOL mode,
compressor frequency lowers.
Temperature of discharge temperature thermistor exceeds 232
°F [111 °C], compressor frequency lowers.
Temperature of discharge temperature thermistor has been 122
°F [50 °C] or less for 20 minutes.
The overcurrent flows into IGBT (Insulated Gate Biopolar
transistor:TR821) or the bus-bar voltage reaches 320 V or more,
PAM stops and restarts.
Zero cross signal for PAM control cannot be detected.
The connector of compressor is disconnected, inverter check
mode starts.
0.5-second ON
0.5-second ON
▪Reconnect connector of compressor.
▪Refer to “10-5.AHow to check inverter/
compressor”.
▪Check stop valve.
▪Refer to “10-5.F Check of outdoor thermistors”.
▪Check indoor/outdoor connecting wire.
▪Replace indoor or outdoor P.C. board if
abnormality is displayed again.
▪Check for a gas leak in a connecting piping, etc.
▪Check stop valve.
▪Refer to 10-5.O“Check of outdoor refrigerant
circuit”.
▪Refer to “10-5.AHow to check inverter/
compressor”.
▪Check stop valve.
▪Check refrigerant circuit and refrigerant amount.
▪Refer to “10-5.kCheck of LEV”.
▪Check around outdoor unit.
▪Check outdoor unit air passage.
▪Refer to “10-5.ICheck of outdoor fan motor”.
▪Check refrigerant circuit and refrigerant amount.
▪Check stop valve.
▪Refer to “10-5.AHow to check inverter/
compressor”.
▪Refer to “10-5.ICheck of outdoor fan motor”.
▪Refer to “10-5.LCheck of inverter P.C. board”.
compressor”.
The unit is normal, but check the following.
▪Check if indoor lters are clogged.
▪Check if refrigerant is short.
▪Check if indoor/outdoor unit air
circulation is short cycled.
▪Check refrigerant circuit and refrigerant amount.
▪Refer to “10-5.kCheck of LEV”.
▪Refer to “10-5.GCheck of outdoor thermistors”.
▪Refer to “10-5.kCheck of LEV”.
▪Check refrigerant circuit and refrigerant amount.
This is not malfunction. PAM protection
will be activated in the following cases:
1. Instantaneous power voltage
drop. (Short time power failure)
2. When the power supply voltage is high.
▪Check if the connector of the compressor is
correctly connected.
▪Refer to “10-5.AHow to check
inverter/compressor".
Blinking →
LED
ON
2.5-second OFF
OFF
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2.5-second OFF
14
Page 15
10-3. HOW TO PROCEED "SELF-DIAGNOSIS"
As this air conditioner has a function to memorize all the failures that had occurred, the latest failure detail can be recalled by
following the procedure below. Use this function when the check code is not displayed with wired remote controller or the remote controller at use is wireless type.
10-3-1. Self-diagnosis <PAR-3xMAA ("x" represents 0 or later)>
Select "Service" from the Main menu, and press the button.
1
Select "Self check" with the F1 or F2 button, and press the button.
With theF1or
2
F2
button, enter the refrigerant address, and press the button.
Test run
Input maintenance info.
Function setting
Check
Self check
rosruC
F1 F2 F3 F4
Ref. address
:tceleS
unem ecivreS
:unem niaM
kcehc fleS
sserddA
Check code, unit number, attribute will appear.
3
"-" will appear if no error history is available.
Resetting the error history.
4
Press the
F4
button (Reset) on the screen that shows the error history.
A conrmation screen will appear asking if you want to delete the error history.
Press the
F4
button (OK) to delete the error history.
If deletion fails, "Request rejected" will appear.
"Unit not exist" will appear if no indoor units that are correspond to the entered
address are found.
Navigating through the screens
• To go back to the Service menu ..........
• To return to the previous screen .......
button
button
Self check
Unt #
Cancel OK
Self check
kcehc fleS
-- --
Grp.
Reset
teseR
Ref. address
Error Unt # CI.prG
Return:
When there is no error history
Ref. address
--
Error
Return:
Ref. address
Return:
Self check
Delete error history?
Ref. address
Error history deleted
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15
Page 16
10-3-2. Self-diagnosis <Wireless remote controller>
<In case of trouble during operation>
When a malfunction occurs to air conditioner, both indoor unit and outdoor unit will stop and operation lamp blinks to inform
unusual stop.
<Malfunction-diagnosis method at maintenance service>
[Procedure]
1. Press the CHECK button twice.
• "CHECK" lights, and refrigerant address "00" blinks.
• Check that the remote controller's display has stopped before continuing.
2. Press the temperature buttons.
• Select the refrigerant address of the indoor unit for the self-diagnosis.
Note: Set refrigerant address using the outdoor unit’s DIP switch (SW1).
(For more information, see the outdoor unit installation manual.)
CHECK
display
ON/OFF
CHECK
TEMP
Refrigerant
address
display
Temperature
button
ON/OFF
button
CHECK
button
MODE
CHECK
TEST RUN
SET
FAN
VANE
LOUVER
RESET
CLOCK
AUTO STOP
AUTO START
h
min
HOUR
button
3. Point the remote controller at the sensor on the indoor unit and press the
HOUR button.
• If an air conditioner error occurs, the indoor unit's sensor emits an
intermittent buzzer sound, the operation light blinks, and the check code is
output.
(It takes 3 seconds at most for check code to appear.)
4. Point the remote controller at the sensor on the indoor unit and press the
ON/OFF button.
• The check mode is cancelled.
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16
Page 17
OPERATION
INDICATOR
lamp blink
pattern
Beep Beep Beep Beep Beep
Beep Beep
Off
Approx. 2.5 sec.OnApprox. 3 sec.On0.5 sec.On0.5 sec.On0.5 sec.On0.5 sec.
Off
Approx. 2.5 sec.OnApprox. 3 sec.On0.5 sec.On0.5 sec.
··· Repeated
Number of blinks/beeps in pattern indicates the check
code in the following table (i.e., n=5 for “U2”)
Number of blinks/beeps in pattern indicates
the check code in the following table
n
th
1st2nd3
rd
1st2
nd
Self-check
starts
(Start signal
received)
Beeper sounds
[Output pattern B]
OPERATION
INDICATOR
lamp blink
pattern
Beep
Beep Beep Beep Beep Beep Beep
Off
Approx. 2.5 sec.On0.5 sec.On0.5 sec.On0.5 sec.
On
0.5 sec.
Off
Approx. 2.5 sec.On0.5 sec.On0.5 sec.
··· Repeated
Number of blinks/beeps in pattern indicates the check
code in the following table (i.e., n=5 for “P5”)
Number of blinks/beeps in pattern indicates
the check code in the following table
n
th
1st2nd3
rd
1st2
nd
Self-check
starts
(Start signal
received)
Beeper sounds
• Refer to the following tables for details on the check codes.
[Output pattern A]
[Output pattern A] Errors detected by indoor unit
Wireless remote controller
Wired remote controller
Beeper sounds/OPERATION
INDICATOR lamp blinks
Check code
(Number of times)
1 P1 Intake sensor error
2
P2 Pipe (TH2) sensor error
P9 Pipe (TH5) sensor error
3 E6,E7 Indoor/outdoor unit communication error
4 P4 Drain sensor error/Float switch connector (CN4F) open
5
P5 Drain pump error
PA Forced compressor stop (due to water leakage abnormality)
6 P6 Freezing/Overheating protection operation
7 EE Communication error between indoor and outdoor units
9 E4,E5 Remote controller signal receiving error
12 Fb (FB)* Indoor unit control system error (memory error, etc.)
14 PL Abnormality of refrigerant circuit
- E0,E3 Remote controller transmission error
- E1,E2 Remote controller control board error
[Output pattern B] Errors detected by unit other than indoor unit (outdoor unit, etc.)
Wireless remote controller
Wired remote controller
Beeper sounds/OPERATION
INDICATOR lamp blinks
Check code
(Number of times)
Notes: 1. If the beeper does not sound again after the initial 2 beeps to conrm the self-check start signal was received and
the OPERATION INDICATOR lamp does not come on, there are no error records.
2. If the beeper sounds 3 times continuously “beep, beep, beep (0.4 + 0.4 + 0.4 sec.)” after the initial 2 beeps to
*The check code in the parenthesis indicates PAR-3xMAA model.("x" represents 0 or later).
OCH699
1 E9
2 UP Compressor overcurrent interruption
3 U3,U4 Open/short of outdoor unit thermistors
14 Others Other errors (Refer to the technical manual for the outdoor unit.)
conrm the self-check start signal was received, the specied refrigerant address is incorrect.
Symptom Remark
Symptom
Indoor/outdoor unit communication error
(Transmitting error) (Outdoor unit)
17
As for indoor
unit, refer to
indoor unit's
service manual.
Page 18
10-4. TROUBLE CRITERION OF MAIN PARTS
SUZ-KA09NA(H)2.MX SUZ-KA12NA(H)2.MX SUZ-KA15NA(H)2.MX
Part name Check method and criterion Figure
Defrost thermistor (RT61)
Fin temperature
thermistor (RT64)
Ambient temperature thermistor (RT65)
Outdoor heat exchanger temperature thermistor (RT68)
Discharge temperature thermistor (RT62)
Compressor
Measure the resistance with a tester.
Refer to “Inverter P.C. board” in "10-6. TEST POINT DIAGRAM AND
VOLTAGE”, for the chart of thermistor.
Measure the resistance with a tester. Before measurement, hold the
thermistor with your hands to warm it up.
Refer to “Inverter P.C. board” in "10-6. TEST POINT DIAGRAM AND
VOLTAGE”, for the chart of thermistor.
Measure the resistance between terminals with a tester.
(Temperature: 14 - 104 °F (-10 - 40 °C))
Normal (Ω)
KA09 KA12 KA15
U-V
U-W
1.26 - 1.72 1.60 - 2.17 0.82 - 1.11
V-W
WH
V
RD BK
W
U
Outdoor fan motor
R. V. coil (21S4)
Expansion valve coil (LEV)
Defrost heater
(SUZ-KA·NAH2)
Measure the resistance between lead wires with a tester.
(Temperature: 14 ~ 104 °F (-10 ~ 40 °C))
Color of lead wire
Normal (Ω)
KA09/12/15
RD – BK
BK – WH
29 - 40
WH – RD
Measure the resistance using a tester.
[Temperature: 14 - 104°F (-10 - 40°C)]
Normal (kΩ)
0.97 - 1.38
Measure the resistance using a tester.
[Temperature: 14 - 104°F (-10 - 40°C)]
Color of lead wire Normal (Ω)
RD – OG
RD – WH
RD – BU
37 - 54
RD – YE
Measure the resistance using a tester.
[Temperature: 14 - 104°F (-10 - 40°C)]
Normal (Ω)
349 - 428
WH
V
(+12V)
WH
OG
RD
RD BK
W
U
LEV
YE
BU
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Page 19
10-5. TROUBLESHOOTING FLOW
A How to check inverter/compressor
Disconnect the connector (CN61) between
compressor and the intelligent power module
(IPM).
Check the voltage between terminals.
Are the voltages balanced?
Yes
Check the compressor.
No
See 10-5. “Check of open phase”.
Replace the inverter P.C. board.
See 10-5. “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
BK (U) - WH (V)
BK (U) - RD (W)
WH(V) - RD (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 blinks 9 times.
(
Refer to "10-6. TEST POINT DIAGRAM AND VOLTAGE".)
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
OK.
OCH699
No
No
Replace the compressor.
Refer to 10-5.
19
“Check of compressor start failure”.
Page 20
D Check of compressor winding
● Disconnect the connector between the compressor and intelligent power module, and measure the resistance between the
compressor terminals.
<Measurement point>
Measure the resistance between the lead wires at 3 points.
BK - WH
BK - RD
WH - RD
<Judgement>
Refer to "10-4. TROUBLE CRITERION OF MAIN PARTS".
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
1 second
2 seconds
10 seconds
Compressor starts
Abnormal
(IPM failure)
(Compressor winding short)
Abnormal
(Compressor lock out)
(Starting defect)
Abnormal
(Poor contact,)
(Outdoor P.C. board defect)
(Disconnected connector)
F Check of compressor start failure
Conrm that 1~4 is normal.
• Electrical circuit check
Contact of the compressor connector
1.
Output voltage of inverter P.C. board and balance of them (See 10-5.
2.
Direct current voltage between DB61(+) and (-) on the inverter P.C. board
3.
Voltage between outdoor terminal block S1-S2
4.
Does the compressor run for 10 seconds or
more after it starts?
No
After the compressor is heated with a drier,
does the compressor start?*
Compressor start failure. Activate pre-heat control.
(Refer to "9-2. PRE-HEAT CONTROL SETTING")
1
Yes
Yes
No
Check the refrigerant circuit.
Check the stop valve.
Replace the compressor.
Abnormal
(Refrigerant circuit defect)
(Closed valve)
10 minutes
Normal
)
*1
Heat the compressor with
a drier for about 20 minutes.
Do not recover refrigerant
gas while heating.
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Heating part
20
Page 21
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.TEST POINT DIAGRAM AND VOLTAGE".)
Yes
Reconnect the connector of thermistor.
Turn ON the power supply and press EMERGENCY OPERATION switch.
Does the unit operate for 10 minutes or more
without showing thermistor abnormality?
Yes
OK.
(Cause is poor contact.)
Thermistor Symbol Connector, Pin No. Board
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
No
No
Replace the thermistor except RT64. When RT64 is
abnormal, replace the inverter P.C. board.
Replace the inverter P.C. board.
H Check of R.V. coil
Inverter P.C. board
First of all, measure the resistance of R.V. coil to check if the coil is defective. Refer to "10-4. TROUBLE CRITERION OF MAIN
PARTS".
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 in COOL mode even if it is set to HEAT mode.
Disconnect connector 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
Replace the 4-way valve.
Replace the inverter
No
P.C. board.
Unit operates in HEAT mode even if it is set to COOL mode.
Disconnect connector 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.
Replace the inverter
Yes
P.C. board.
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Page 22
I Check of outdoor fan motor
Check the connection between the
connector CN931 and CN932.
Disconnect the connectors CN931
and CN932 from the inverter P.C.
board.
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)
Replace the outdoor fan motor.
Does the voltage between each terminal become 5 and 0
No
VDC repeatedly?
Yes
Does the outdoor fan motor rotate smoothly?
No
Replace the inverter P.C. board.
Yes
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22
Page 23
J Check of power supply
Disconnect the connector between
compressor and intelligent power
module.
Turn ON power supply and press
the TEST button twice on the indoor
unit or remote controller.
Does the POWER lamp on remote
controller light up?
Yes
Is there bus-bar voltage 260-370 VDC
between DB61 (+) and DB61 (–) on
the inverter P.C. board?
6.TEST POINT DIAGRAM AND VOLTAGE.")
(Refer to
No
"10-
No
Yes
Rectify indoor/outdoor
connecting wire.
Yes
Is there voltage 208/230 VAC
between the indoor terminal
block S1 and S2?
Does LED on the inverter P.C. board
light up or
POINT DIAGRAM AND VOLTAGE.")
blink
? (Refer to "10-6.TEST
Yes
Replace the indoor
electronic control P.C.
No
board.
Replace the inverter
No
P.C. board.
260-370 VDC
Check the electric parts in main circuit.
K Check of LEV (Expansion valve)
Start
Turn on power supply to the outdoor unit after checking
LEV coil is xed to the LEV body securely.
Is "click - click" sound heard?
Or, do you feel vibration of the LEV coil with a hand?
No
Disconnect the connector CN724 is there
normal resistance to LEV coil? (Refer to 10-4.
TROUBLE CRITERION OF MAIN PARTS)
No
If light up, OK.
If blink, refer to
PROCEED "SELF-DIAGNOSIS"".
Yes
Yes
"10-3. HOW TO
Normal
Replace the inverter P.C. board.
DB61
Inverter P.C. board
(Solder side)
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Replace the LEV coil.
23
Page 24
L Check of inverter P.C. board
Check the outdoor fan motor.
(Refer to "10-5. . Check of outdoor fan motor".)
Is the fuse (F901) blown on the inverter
P.C. board?
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
EMERGENCY OPERATION.
Check the LED indication on the inverter P.C. board.
Does the LED blink 10 times?
Yes
(10-time blink)
Replace the inverter P.C. board.
Yes
No
Check the corresponding parts
following LED indication.
(Refer to "10-3. HOW TO PRCEED "SELF-DIAGNOSIS"".)
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Page 25
M How to check miswiring and serial signal error
Turn OFF the power supply.
Is there rated voltage in the power supply?
Turn ON the power supply.
Is there rated voltage between the outdoor terminal block S1 and S2?
Press TEST button twice.
Does POWER lamp on remote controller light up?
<Conrmation of the power to the indoor unit>
Is the self-check of the remote controller
indicated 6 minutes later?
Turn OFF the power supply.
Check once more if the indoor/outdoor
B
connecting wire is not miswiring.
Short-circuit outdoor terminal block S2
*
1
and S3.
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 "10-6. TEST POINT DIAGRAM AND VOLTAGE".)
Yes
Yes
Yes
Yes
A
Yes
No
No
No
*
1. Miswiring may damage indoor electronic control P.C.
board during the operation.
Be sure to conrm the wiring is correct before the operation starts.
*
2. Be careful of the residual voltage of smoothing capacitor.
*
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 is normal, LED blinks 6 times after 3
minutes.
Check the power supply.
No
Is there any miswiring,
poor contact, or wire
disconnection of the
indoor/outdoor connecting wire?
No
No
Check of power supply.
(Refer to 10-5.J.)
Check the wiring.
Correct them.
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"?
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 the indoor terminal block S1 and S2?
<Conrmation of power voltage>
Is there amplitude of 10 to 20 VDC between the indoor terminal block
S2 and S3? <Conrmation of serial signal>
A
• Turn OFF inverter-controlled lighting
equipment.
• Turn OFF the power supply and then
turn ON again.
• Press TEST button twice.
Is the self-check
of the remote controller indicated 6
minutes later?
Yes
B
Reinstall either
the unit or the
light away from
No
each other.
*
3
Yes
No
Yes
No
Yes
Is there rated voltage between indoor terminal block S1 and S2?
<Con rmation of power voltage>
Yes
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?
Replace the indoor
controller P.C. board.
No
No Yes Yes
Replace the indoor/outdoor
connecting wire.
*
No
(Lighted
or not
lighted)
Replace the inverter P.C. board.
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
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?
2
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25
Page 26
N Check the defrost heater
SUZ-KA09/12/15NAH2
Check the following points before checking electric continuity.
1. Does the resistance of ambient temperature thermistor have the characteristics? Refer to 10-6.1.
2. Is the resistance of defrost heater normal? Refer to 10-4.
3. Is the heater protector closed?
4. Are both ambient temperature thermistor and circuit of defrost heater securely connected to connectors?
In HEAT mode, for more than 5 minutes, let the ambient temperature thermistor continue to read
32°F (0°C) or below, and let the defrost thermistor continue to read 30°F (-1°C) or below.
NOTE: In case both thermistors are more than the above temperature, cool them with cold
water etc...
Is there 208/230 VAC between CN722 and on
the inverter P.C. board? Refer to 10-6.1.
No
Replace the inverter P.C. board.
O Check of outdoor refrigerant circuit
Has the operation stopped
during pump down?
Yes
The operation has stopped to prevent the diesel explosion caused by
air trapped in the refrigerant circuit.
Close the stop valve, and disconnect
the power plug or turn the breaker
OFF.
No
Was the operation started with
the stop valve closed, and was
it opened during operation?
The refrigerant gas amount may be
60% or less than the normal amount.
Identify where the gas is leaking from,
and x the leak.
Yes
Not the problem of the inverter P.C. board.
The unit occasionally stops when the
stop valve is opened or closed during
operation. Open the stop valve and
Yes
start the cooling operation again.
No
CAUTION : Do not start the operation again to prevent hazards.
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26
Page 27
P Electromagnetic noise enters into TV sets or radios
Is the unit grounded?
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.?
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
No
Yes
Yes
Yes
Yes
Ground the unit.
Extend the distance between the antennas and
the indoor unit, and/or the antennas and the
outdoor unit.
Extend the distance between the TV sets and/or
radios and the indoor unit, or the TV sets or
radios and the outdoor unit.
Replace or repair the antenna.
Replace or repair the coaxial cable.
Extend the distance between the indoor/outdoor
connecting wire of the air conditioner and the wiring of the antennas.
Even if all of the above conditions are fullled, the electromagnetic noise may enter, depending on the electric eld strength
or the installation condition (combination of specic 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 eld intensity of the broadcast station affected by the electromagnetic noise
6. Presence or absence of amplier 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.
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27
Page 28
10-6. TEST POINT DIAGRAM AND VOLTAGE
Inverter P.C. board
SUZ-KA09NA(H)2.MX SUZ-KA12NA(H)2.MX SUZ-KA15NA(H)2.MX
Back side of unit
208/230 VAC
Fuse (F901)
T3.15AL250V
Output to
drive outdoor
fan motor
(CN932)
Output to
drive
compressor
(LDU,
LDV,
LDW)
Smoothing
capacitor (C63)
DB61
260 - 370 VDC
(+)(-)
Smoothing
capacitor (C62)
Fuse (F801)
T3.15AL250V
Smoothing
capacitor (C61)
R.V.coil
(CN721)
208/230 VAC
Heater connector
(CN722)
(SUZ-KA09/
12/15NAH2)
Fuse (F701)
T3.15AL250V
LED
Front side of unit
Fin temperature
thermistor/RT64
Defrost thermistor(RT61)
Ambient temperature thermistor(RT65)
Outdoor heat exchanger temperature thermistor(RT68)
100
90
80
70
60
50
40
30
Resistance(kΩ)
20
10
0
-4 14 32 50 68 86 104
Temperature(°F)
(CN642)
Signal of outdoor
fan motor (CN931)
Defrost thermistor
Ambient temperature
thermistor/RT65
Discharge temperature thermistor (RT62)
800
700
600
500
400
300
Resistance (kΩ)
200
100
0
32 50 68 86 104 122 140 158 176 194 212 230 248
/RT61(CN641)
(CN643)
Temperature (°F)
Discharge temperature
thermistor/RT62
(CN641)
Outdoor heat exchanger
temperature thermistor
/RT68 (CN644)
200
180
160
140
120
100
Resistance(kΩ)
208/230 VAC
Jumper wire for preheat control setting
(JK)
Jumper wire for
changing defrost
setting (JS)
LEV connector
(CN724)
Fin temperature thermistor(RT64)
80
60
40
20
0
32 50 68 86 104 122 140 158 176
Temperature(°F)
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Page 29
11
FUNCTION SETTING
11-1. UNIT FUNCTION SETTING BY THE REMOTE CONTROLLER
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.)
Function
Power failure
automatic recovery
Indoor temperature
detecting
LOSSNAY
connectivity
Power supply
voltage
Frost prevention
temperature
Settings
Not available
Available (Approx. 4-minute wait-period after power is restored.)
Indoor unit’s internal sensor
Data from main remote controller *1
Not supported
Supported (indoor unit dose not intake outdoor air through LOSSNAY)
Supported (indoor unit intakes outdoor air through LOSSNAY)
230V
208V
2: [36°F] (Normal)
3: [37°F]
Mode No.
Wired remote
controller
(RF thermostat)
Setting
01
(101)
02
(—)
03
(103)
04
(104)
15
(115)
: Initial setting
(when sent from the factory)
No.
1
2
1
2
3
1
2
3
1
2
1
2
Check
*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.
—
—
Setting No.
2
3
1
2
3
: Initial setting
(
Factory setting
Ceiling suspended
—
—
1
1
2
2
2
)
Refer to the
table below
Refer to the
table below
: Initial setting
(
Factory setting
Multi position
SVZ-KP·NA PEAD-A·AA
Refer to the
table below
Refer to the
table below
Check
)
Mode
No.
Function Settings
Filter sign
External static pressure
Heater control *2
Set temperature in heating
mode *3
Fan speed during the
heating thermo OFF
Fan speed during the
cooling thermo OFF
Detection of abnormality of
the pipe temperature (P8)
*2 For the detail of Heater control, refer to the service manual.
*3 4 degC (7.2 degF) up
*4 Depend on the error, heater may not operate please refer to SVZ service manual.
External static pressure setting for SEZ.
External static
pressure
5Pa (0.02in.WG)
15Pa (0.06in.WG)
35Pa (0.14in.WG)
50Pa (0.20in.WG)
External static pressure setting for SVZ (Vertical, Horizontal left, Horizontal right position*).
External static
pressure
75Pa (0.3in.WG)
125Pa (0.5in.WG)
200Pa (0.8in.WG)
* Regarding to down flow setting, please refer to down flow kit installation manual.
100h 1
2500h
No filter sign indicator
5/15/35/50Pa
(0.02/0.06/0.14/0.20in.WG)
No heater present
Heater present
SEZ, SLZ :Set temp -4.5°F ON
PEAD, SVZ :Heater not operation in Defrost/Error
SEZ, SLZ :Set temp -1.8°F ON
PEAD, SVZ :Heater not operation in Defrost/Error*4
Available
Not available
Extra low
Stop
Set fan speed
Set fan speed
Stop
Available
Not available
Setting No.
Mode No. 08 Mode No. 10
1
1
2
3
Setting No.
Mode No. 08 Mode No. 10
1
2
3
2
1
1
1
1
1
1
: Initial setting
(
Factory setting
: Initial setting
(
Factory setting
)
)
Check
Check
Wired remote
controller
(RF thermostat)
(107)
(108)
(110)
(111 )
(123)
(124)
(125)
(127)
(128)
Setting
No.
Ceiling concealed Ceiling cassette
SEZ-KD·NA4 SLZ-KA·NA
07
2
3
08
Refer to the table below
10
Refer to the table below
pressure
—
—
Mode No. 08 Mode No. 10
1
11
2
1
23
2
24
1
2
1
25
2
3
1
27
2
1
28
2
External static pressure setting for PEAD.
External static
35Pa (0.14in.WG)
50Pa (0.20in.WG)
70Pa (0.28in.WG)
100Pa (0.40in.WG)
150Pa (0.60in.WG)
Remarks
The setting
is applied to
all the units
in the same
refrigerant
system.
Check
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29
Page 30
11-1-1. Selecting functions using the wired remote controller <PAR-3xMAA ("x" represents 0 or later)>
<Service menu>
Maintenance password is required
Select "Service" from the Main menu, and press the button.
1
*At the main display, the menu button and select "Service" to make the
maintenance setting.
When the Service menu is selected, a window will appear asking for the pass-
2
word.
To enter the current maintenance password (4 numerical digits), move the
cursor to the digit you want to change with the F1
Set each number (0 through 9) with the
Then, press the
button.
F3
or
F4
or F2 button.
button.
Main
Main display:
Select:
Main menu
Maintenance
Initial setting
Service
Cursor Page
Service menu
Enter maintenance password
Cursor
F1 F2 F3 F4
Note: The initial maintenance password is "9999". Change the default
password as necessary to prevent unauthorized access. Have the
password available for those who need it.
: If you forget your maintenance password, you can initialize the
password to the default password "9999" by pressing and holding
the
F1
and
F2
buttons simultaneously for three seconds on the
maintenance password setting screen.
If the password matches, the Service menu will appear.
3
The type of menu that appears depends on the connected indoor units’ type.
Note: Air conditioning units may need to be stopped to make certain set-
tings. There may be some settings that cannot be made when the
system is centrally controlled.
A screen will appear that indicates the setting has been saved.
Test run
Input maintenance info.
Function setting
Check
Self check
Maintenance password
Remote controller check
Service menu
unem ecivreS
:unem niaM
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:unem niaM
rosruC
OCH699
Navigating through the screens
• To go back to the Main menu ..................
• To return to the previous screen ...............
30
button
button
Not available.
Please stop the unit.
Service menu:
Page 31
<Function setting>
Select "Service" from the Main menu, and press the button.
1
Select "Function setting" with the F1
Set the indoor unit refrigerant addresses and unit numbers with the F1
2
or F2 button, and press the button.
through F4 buttons, and then press the button to confirm the current
setting.
<Checking the indoor unit No.>
When the
button is pressed, the target indoor unit will start fan operation.
If the unit is common or when running all units, all indoor units for the selected
refrigerant address will start fan operation.
When data collection from the indoor units is completed, the current settings
3
appears highlighted.
Non-highlighted items indicate that no function settings are made.
Screen appearance varies depending on the "Unit No." setting.
Test run
Input maintenance info.
Function setting
Check
Self check
rosruC
unem ecivreS
:unem niaM
F1 F2 F3 F4
Function setting
Ref. address
Unit No.
Monitor:
Cursor Address
Grp./1/2/3/4/All
F1 F2 F3 F4
Function setting
Ref. address
Mode 1
Mode 2
Mode 3
Mode 4
Request:
Cursor Cursor
Grp.
Use the F1 or F2 button to move the cursor to select the mode number,
4
and change the setting number with the F3
When the settings are completed, press the button to send the setting
5
or F4 button.
data from the remote controller to the indoor units.
When the transmission is successfully completed, the screen will return to the
Function setting screen.
Note: • Make the above settings only on Mr. Slim units as necessary.
•
The above function settings are not available for the CITY MULTI
units.
•
Table 1 summarizes the setting options for each mode number. Refer to
the indoor unit Installation Manual for the detailed information about ini
tial settings, mode numbers, and setting numbers for the indoor units.
•
Be sure to write down the settings for all functions if any of the initial
settings has been changed after the completion of installation work.
Function setting
Ref. address
Mode 7
Mode 8
Mode 9
Mode 10
Request:
Cursor Cursor
Unit #1
F1 F2 F3 F4
Function setting
Ref. address
Sending data
-
F1 F2 F3 F4
Grp.
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31
Page 32
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. (2) The terminal with this connector has the
Sleeve
locking mechanism.
Locking lever
Slide the sleeve.
Pull the terminal while
pushing the locking
lever.
Hold the sleeve, and
pull out the terminal
slowly.
Connector
12-1. SUZ-KA09NA(H)2.MX SUZ-KA12NA(H)2.MX SUZ-KA15NA(H)2.MX
: Indicates the visible parts in the photos/gures.
: Indicates the invisible parts in the photos/gures.
NOTE: Turn OFF the power supply before disassembly.
OPERATING PROCEDURE PHOTOS/FIGURES
1. Removing the cabinet
(1) Remove the screw fixing the service panel.
(2) Pull down the service panel and remove it.
(3) Remove the screws fixing the conduit cover.
(4) Remove the conduit cover. (Photo 4)
(5) Remove the screw fixing the conduit plate. (Photo 5)
(6) Remove the conduit plate.
(7) Disconnect the power supply wire and indoor/outdoor
connecting wire.
(8) Remove the screws fixing the top panel.
(9) Remove the top panel.
(
10
) Remove the screws fixing the cabinet.
(
11
) Remove the cabinet.
(
12
) Remove the screws fixing the back panel.
(
13
) Remove the back panel.
Photo 1
Screws of
the top panel
Back
panel
Screws
of the
back
panel
Photo 2
OCH699
Screws of the
top panel
Screws of the
cabinet
Screws of
the cabinet
Photo 3
Screws of
the cabinet
32
Screw of the
cabinet
Service
panel
Screws of
the terminal block
support and the
back panel
Direction
to remove
Hooks
Page 33
OPERATING PROCEDURE PHOTOS/FIGURES
Photo 4 Photo 5
Screws of the
conduit cover
Screw of the
conduit plate
2. Removing the inverter assembly, inverter P.C. board
(1) Remove the cabinet and panels. (Refer to 1.)
(2) Disconnect the lead wire to the reactor and the following
connectors:
<Inverter P.C. board>
CN721 (R.V. coil)
CN722 (Defrost heater and heater protector) (SUZ-KA09/
12/15NAH2)
CN931, CN932 (Fan motor)
CN641 (Defrost thermistor and discharge temperature ther-
mistor)
CN643 (Ambient temperature thermistor)
CN644 (Outdoor heat exchanger temperature thermistor)
CN724 (LEV)
(3) Remove the compressor connector (CN61).
(4) Remove the screws fixing the heat sink support and the
separator.
(5) Remove the fixing screws of the terminal block support and
the back panel.
(6) Remove the inverter assembly.
(7) Remove the screw of the ground wire and screw of the ter-
minal block support.
(8) Remove the heat sink support from the P.C. board support.
(9) Remove the screw of the inverter P.C. board and remove the
inverter P.C. board from the P.C. board support.
3. Removing R.V. coil
(1) Remove the cabinet and panels. (Refer to 1.)
(2) Disconnect the following connectors:
<Inverter P.C. board>
CN721 (R.V. coil)
(3) Remove the R.V. coil.
Photo 6
Screws of the heat sink
support and the separator
Photo 7
Heat sink
Heat sink support
P.C. board
support
Screws of the terminal block
support and the back panel
Screw of the
Terminal block
support
OCH699
33
Screw of the
inverter P.C. board
Terminal
block
support
Screw of the
ground wire
Page 34
OPERATING PROCEDURE PHOTOS/FIGURES
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 1.)
(2) Disconnect the lead wire to the reactor and the following con-
nectors:
<Inverter P.C. board>
CN641 (Defrost thermistor and discharge temperature ther-
mistor)
CN643 (Ambient temperature thermistor)
CN644 (Outdoor heat exchanger temperature thermistor)
(3) Pull out the discharge temperature thermistor from its holder.
(4) Pull out the defrost thermistor from its holder.
(5) Pull out the outdoor heat exchanger temperature thermistor
from its holder.
(6) Pull out the ambient temperature thermistor from its holder.
Photo 8
Screw of the
R.V. coil
Discharge temperature thermistor
Photo 9
Ambient temperature
thermistor
Outdoor heat
exchanger temperature thermistor
Defrost thermistor
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Page 35
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Page 36
HEAD OFFICE: TOKYO BUILDING., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO100-8310, JAPAN
Copyright 2018 MITSUBISHI ELECTRIC CORPORATION
Published : Dec. 2018 No.OCH699
Made in Japan
Specifications are subject to change without notice.
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