Mitsubishi 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-KA18NA(H)2.TH
SUZ-KA24NA(H)2.TH
SUZ-KA30NA(H)2.TH
SUZ-KA36NA(H)2.TH
PARTS CATALOG (OCB688)
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
Note:
•This manual describes service
data of the outdoor units only.
No. OCH688
REVISED EDITION-A
May 2019
SPLIT-TYPE, AIR CONDITIONERS
SUZ-KA18NA(H)2.TH
Revision:
•Some descriptions
have been modified in
REVISED EDITION-A.
OCH688 is void.

2
OCH688A
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-
—
—
—
—
—
—
—
—
—
—
—
—
—
—
Indoor unit
Service
Manual No.
Service Ref.
Heat pump without
electric heater
OCH669
OCB669
KA18NA(H)2.TH
—
—
—
—
—
—
—
—
—
—
—
—
—
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
—
—
—
—
—
—
SEZ-KD18NA4.TH
SLZ-KF18NA.TH

3
OCH688A
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. (Model) 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 Win 34-5/8 D in 33-1/16
Hin 13
Weight Ib 127 129
([WHUQDO¿QLVK 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.
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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

4
OCH688A
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

5
OCH688A
SUZ-KA18NA2.TH
5WIRING DIAGRAM
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OCH688A
SUZ-KA18NAH2.TH
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SUZ-KA24NA2.TH SUZ-KA30NA2.TH  SUZ-KA36NA2.TH
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9
OCH688A
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
OCH688A
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)