Mitsubishi Electric SUZ-KA18NA2 User manual

SERVICE MANUAL R410A
Outdoor unit
[Model Name]
SUZ-KA18NA2
SUZ-KA18NAH2
SUZ-KA24NA
SUZ-KA24NAH2
SUZ-KA30NA
SUZ-KA30NAH2
SUZ-KA36NA
SUZ-KA36NAH2
[Service Ref.]
SUZ-KA18NA2.TH
SUZ-KA18NAH2.TH
SUZ-KA24NA2.TH
SUZ-KA24NAH2.TH
SUZ-KA30NA2.TH
SUZ-KA30NAH2.TH
SUZ-KA36NA2.TH
SUZ-KA36NAH2.TH
PARTS CATALOG (OCB688)
Note:
• This manual describes service
data of the outdoor units only.
No. OCH688
REVISED EDITION-D
June 2021
SPLIT-TYPE, AIR CONDITIONERS
SUZ-KA18NA(H)2.TH
Revision:
•Some descriptions have
been modified in REVISED
EDITION-D.
OCH688C is void.
CONTENTS
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 ······ 9
7. DATA ······················································· 11
8. ACTUATOR CONTROL·························· 14
9. SERVICE FUNCTIONS··························· 15
10. TROUBLESHOOTING···························· 15
11. FUNCTION SETTING ····························· 32
12. DISASSEMBLY INSTRUCTIONS··········· 35

2
OCH688D
1COMBINATION OF INDOOR AND OUTDOOR UNITS
OUTDOOR UNIT
Piping
Air outlet
Drain outlet
Air inlet
(back and side)
Drain hose
PART NAMES AND FUNCTIONS
2
SUZ-KA18NA(H)2.TH SUZ-KA24NA(H)2.TH SUZ-KA30NA(H)2.TH SUZ-KA36NA(H)2.TH
Heat pump type
Outdoor unit
SUZ-
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Indoor unit
Service
Manual No.
Service Ref.
Heat pump without
electric heater
OCH669
OCB669
KA18NA(H)2.TH
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PEAD-A18AA7.MX
PEAD-A24AA7.MX
PEAD-A30AA7.MX
PEAD-A36AA7.MX
SVZ-KP18NA.MX
SVZ-KP24NA.MX
SVZ-KP30NA.MX
SVZ-KP36NA.MX
MLZ-KP18NA
MD-1404-K019
MD-1404-K018
KA24NA(H)2.TH KA30NA(H)2.TH KA36NA(H)2.TH
HWE08020
BWE10180
OBH802
OBB802
HWE16080
BWE016290
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SEZ-KD18NA4.TH
SLZ-KF18NA.TH

3
OCH688D
Outdoor unit model SUZ-KA18
NA(H)2
SUZ-KA24
NA(H)2
SUZ-KA30
NA(H)2
SUZ-KA36
NA(H)2
Power supply V , phase , Hz 208/230 , 1 , 60
Max. fuse size (time delay) A 15 20
Min. circuit ampacity A 14 17
Fan motor F.L.A 0.67 1.00
Compressor
Model SNB130FQBMT SNB220FQGM1T
R.L.A 10.0 13.0
L.R.A 12.5 16.0
Refrigeration oil oz. (Mod-
el) 11.8(FV50S) 15.6(FV50S)
Refrigerant control Linear expansion valve
Sound level*1Cooling dB(A) 54 55
Heating dB(A) 55
Defrost method Reverse cycle
Dimensions
W in 33-1/16
D in 13
H in 34-5/8
Weight Ib 127 129
External nish Munsell 3Y 7.8/1.1
Control voltage
(by built-in transformer) VDC 12 - 24
Refrigerant piping Not supplied
Refrigerant pipe size
(Min. wall thickness)
Liquid in 1/4 (0.0265) 3/8(0.0285)
Gas in 1/2 (0.0285) 5/8(0.0315)
Connection method Indoor Flared
Outdoor Flared
Between the indoor &
outdoor units
Height difference ft 50 100
Piping length ft 100
Refrigerant charge (R410A) 3 lb. 9 oz. 4 lb. 14 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.
3SPECIFICATION
OPERATING RANGE
(1) POWER SUPPLY
Rated voltage Guaranteed voltage (V)
Outdoor unit
208/230 V
1 phase
60 Hz
Min. 187 208 230 Max. 253

OCH688D 4
Unit: inch
SUZ-KA18NA(H)2.TH SUZ-KA24NA(H)2.TH SUZ-KA30NA(H)2.TH SUZ-KA36NA(H)2.TH
4OUTLINES AND DIMENSIONS
16-7/16
1-9/16
1-5/8
Drain hole
6-7/8 19-11/16
13
2
Air in
Air in
Air out
2-holes 13/32 13/16
14-3/16
33-1/16
4-5/16
3-3/16
34-5/8
17-25/32
Service panel
3-29/32
6-1/2
7-11/16
35
44
Liquid refrigerant pipe joint
Refrigerant pipe (flared) Ø 1/4 (KA18)
Refrigerant pipe (flared) Ø 3/8 (KA24/30/36)
Gas refrigerant pipe joint
Refrigerant pipe (flared) Ø 1/2 (KA18)
Refrigerant pipe (flared) Ø 5/8 (KA24/30/36)
*1 20 in. (500 mm) or more when front
and sides of the unit are clear
14 in. (350 mm)
or more
4 in. (100 mm)
or more
REQUIRED SPACE
Clear *1
4 in. (100 mm)
or more
20 in. (500 mm)
or more *2
*2 When any 2 sides of left, right
and rear of the unit are clear

OCH688D 5
SUZ-KA18NA2.TH
5WIRING DIAGRAM
4
W
W
W
4

6
OCH688D
SUZ-KA18NAH2.TH
4
W
W
W
4

7
OCH688D
SUZ-KA24NA2.TH SUZ-KA30NA2.TH SUZ-KA36NA2.TH
L
2
Ｌ
1
ＭＳ
ＭＳ
３～
BN
TAB61
TAB62
TABS3
LED
YE
BU
1
34
L
2
43
PTC65
DB41A DB41B
X64
TAB3B TAB3A
PTC64
WHRD
F601
Q3B
BU
CIRCUIT
BREAKER
GNYE
Q3A
D3B D3A
208/230V AC
60Hz
TB1
ＭＦ
BK
WH
RD
33
11
ＭＣ
U
W
V
BK RD
WH
CB3
N
P
W
V
U
IC700
TAB9 TAB8 TAB7
＋＋
CB2
＋
CB1
TAB4A
TAB4B
POWER
SUPPLY
２１Ｓ４
Ｓ１ Ｓ３ Ｓ２
ＭＳ
３～
26H
H
RT61
1 2
CN601 X601
5
Ｍ
ＬＥＶ
1
CN724
6
RT65
CN672
21
LD9 BK
RD
TABS3
LED
INVERTER
P.C.
BOARD
T801
12
CN602
LDE1 LDE2
BK
BK
X602 F601
RT64
t°
RT68RT62
5 1
CN931
21
CN673
1 6
CN671
GNYE
TO INDOOR
UNIT
208/230V
AC
24V
DC-12
TB2
ＭＦ
8
F880 F901
TAB9
IC932
CN932
13
WH
BU
2 2 RD
22
11
1 1
YE
BK BK
BK BK
BKBK
BK t°t°t°t°
NAME
SWITCHING
POWER
TRANSISTOR
DEFROST
THERMISTOR
DISCHARGE
TEMP.THERMISTOR
AMBIENT
TEMP.THERMISTOR
FIN
TEMP.THERMISTOR
OUTDOOR
HEAT
EXCHANGER
TEMP.THERMISTOR
SYMBOL
Q3A,Q3B
RT61 RT62 RT64 RT65 RT68
TERMINAL
BLOCK
TRANSFORMER
TB1,TB2
T801
X64
RELAY
X601,X602
RELAY
21S4 26H
HEATER
PROTECTOR
（
OPTION
PARTS
）
REVERSING
VALVE
COIL
SYMBOL
NAME
F901 F880 F601
FUSE
（
T3.15AL250V
）
FUSE
（
T3.15AL250V
）
H
DEFROST
HEATER
（
OPTION
PARTS
）
IC700,IC932
L
REACTOR POWER
MODULE
PTC64,PTC65
CIRCUIT
PROTECTION
MF MC LEV
LED
LED
EXPANSION
VALVE
COIL
COMPRESSOR
FAN
MOTOR
DIODE
（
OPTION
PARTS
）
SYMBOL
NAMENAME
DIODE
MODULE
SMOOTHING
CAPACITOR
FUSE
（
T3.15AL250V
）
SYMBOL
DB41A,DB41B
D3A,D3B
CB1,CB2,CB3
NOTES
1.About
the
indoor
side
electric
wiring,
refer
to
the
indoor
unit electric
wiring
diagram
for
servicing.
2.Use
copper
supply
wires. 3.Symbols
indicate, :Terminal
block :Connector

8
OCH688D
SUZ-KA24NAH2.TH SUZ-KA30NAH2.TH SUZ-KA36NAH2.TH
RELAY
X601,X602
DEFROST
HEATER
BU
WH
POWER SUPPLY
3 1
CN932
IC932
TAB4B TAB4A
CB1
＋
CB2
＋ ＋
TAB7TAB8TAB9
IC700
U
V
W
P
N
CB3
WH
RD BK V
W
U
ＭＣ
1 1
3 3
RD
WH
BK
F901F880 8
ＭＦ
TB2
12 - 24V
DC
208/230V
AC
TB1
208/230V AC 60Hz
TO
INDOOR
UNIT
D3A D3B
Q3A
GNYE
CIRCUIT
BREAKER
BU
Q3B
CN671
61
CN673
1 2
CN931
15
RT62 RT68
t°t°t°t°t°
RT64
F601
X602
BK
BK
LDE2 LDE1
CN602
21
T801
INVERTER
P.C.
BOARD
RD WH
PTC64
TAB3A
TAB3B
X64
DB41B DB41A
PTC65
3 4
2
L
4 3
1
BU YE
LED
TABS3
RD
TAB62 TAB61
BK
LD9
1 2
CN672
RT65
6
CN724
1
ＬＥＶ
Ｍ
5
X601
CN601
21
RT61
BN
３～
ＭＳ
３～
ＭＳ
Ｓ２ Ｓ３
Ｓ１
Ｌ
1
L
2
２１Ｓ４
3.Symbols
indicate,
:Terminal
block
:Connector2. Use
copper
supply
wires.
1. About
the
indoor
side
electric
wiring,
refer
to
the
indoor
unit
electric
wiring
diagram
for
servicing.
NOTES
RELAY
NAME
F601 F880 F901
CB1,CB2,CB3
D3A,D3B
DB41A,DB41B
SYMBOL
FUSE
（
T3.15AL250V
）
FUSE
（
T3.15AL250V
）
FUSE
（
T3.15AL250V
）
SMOOTHING
CAPACITOR
REACTOR
CIRCUIT
PROTECTION
FAN
MOTOR
MF
COMPRESSOR
MC
EXPANSION
VALVE
COIL
LEV
LED
LED
DISCHARGE
TEMP.THERMISTOR
RT62
TRANSFORMER
T801
TERMINAL
BLOCK
RT68
TEMP.THERMISTOR
OUTDOOR
HEAT
EXCHANGER
TB1,TB2
SWITCHING
POWER
TRANSISTOR
Q3A,Q3B
DIODE
MODULE
NAME NAME NAME
SYMBOL SYMBOL
DIODE
RT64
FIN
TEMP.THERMISTOR
POWER
MODULE
PTC64,PTC65
X64
IC700,IC932
L
H
RT61
DEFROST
THERMISTOR
RT65
AMBIENT
TEMP.THERMISTOR
21S4 26H
HEATER
PROTECTOR
REVERSING
VALVE
COIL
SYMBOL
YE
RD
BKBKBK
BK BK
BK BK
11
1 1
22
2 2
H
26H

9
OCH688D
Unit: inch (mm)
SUZ-KA18NA(H)2.TH
Outdoor
heat
exchanger
Flared connection
Defrost
thermistor
RT61
Discharge
temperature
thermistor
RT62
Flared connection
Stop valve
Capillary tube
O.D. 0.157×
I.D. 0.094×
3-15/16
(ø 4.0 × ø 2.4 × 100)
Capillary tube
O.D. 0.157×
I.D. 0.094×7-7/8
(ø 4.0 × ø 2.4 × 200)
Refrigerant flow in cooling
Compressor
4-way
valve
Refrigerant flow in heating
Refrigerant pipe
ø1/2 ( ø 12.7)
(with heat insulator)
Refrigerant pipe ø1/4 ( ø 6.35)
(with heat insulator)
LEV
R.V. coil
heating ON
cooling OFF
Strainer
#100
Outdoor heat
exchanger
temperature
thermistor
RT68
Strainer
#100
Muffler
Capillary tube
O.D. 0.118×
I.D. 0.079× 7-7/8
(ø3.0×ø2.0×200(×4))
Stop valve
(with service port)
Service
port
Service port
Muffler
Strainer
#100
6REFRIGERANT SYSTEM DIAGRAM
SUZ-KA24NA(H)2.TH SUZ-KA30NA(H)2.TH SUZ-KA36NA(H)2.TH
Outdoor
heat
exchanger
Flared connection
Defrost
thermistor
RT61
Discharge
temperature
thermistor
RT62
Flared connection
Stop valve
(with strainar)
Stop valve
(with service port)
Capillary tube
O.D. 0.142 × I.D. 0.094
× 1-31/32
(ø 3.6 × ø 2.4 × 50)
Refrigerant flow in cooling
Compressor
4-way valve
Refrigerant flow in heating
Refrigerant pipe
ø 5/8
(with heat insulator)
Refrigerant pipe ø 3/8
(with heat insulator)
LEV
R.V. coil
heating ON
cooling OFF
Muffler
#100
Receiver
Outdoor heat
exchanger
temperature
thermistor
RT68
Ambient
temperature
thermistor
RT65
Strainer
#100
Service port
Service port
Unit: inch (mm)

10
OCH688D
Max. Length
A
Max. Height
difference
B
Indoor
unit
Outdoor unit
MAX. REFRIGERANT PIPING LENGTH and MAX. HEIGHT DIFFERENCE
Model
Refrigerant piping: ft. Piping size O.D: in.
Max. Length
A
Max. Height difference
BGas Liquid
SUZ-KA18/NA(H)2
100
50 1/2 1/4
SUZ-KA24/30/36
NA(H)2 100 5/8 3/8
ADDITIONAL REFRIGERANT CHARGE (R410A: oz.)
NOTE: Refrigerant piping exceeding 25 ft. requires additional refrigerant charge according to the calculation.
Model Outdoor unit
precharged
Refrigerant piping length (one way): ft.
25 30 40 50 60 70 80 90 100
SUZ-KA18NA2
SUZ-KA18NAH2 3 lb. 9 oz. 0 1.08 3.24 5.40 7.56 9.72 11.88 14.04 16.20
Calculation: X oz. = 1.08/5 oz./ft. × (Refrigerant piping length (ft.) - 25)
Model Outdoor unit
precharged
Refrigerant piping length (one way): ft.
25 30 40 50 60 70 80 90 100
SUZ-KA24/30/36
NA(H)2 4 lb. 14 oz. 0 2.69 8.07 13.45 18.83 24.21 29.59 34.97 40.35
Calculation: X oz. = 2.65/5 oz./ft. × (Refrigerant piping length (ft.) - 25)