Table of Contents
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SPLIT-TYPE, AIR CONDITIONERS
SERVICE MANUAL
Outdoor unit
[Model Name]
SUZ-KA18NA2
SUZ-KA18NAH2
SUZ-KA24NA
SUZ-KA24NAH2
SUZ-KA30NA
SUZ-KA30NAH2
SUZ-KA36NA
SUZ-KA36NAH2
SUZ-KA18NA(H)2.TH
R410A
[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
REVISED EDITION-D
Revision:
• Some descriptions have
been modified in REVISED
EDITION-D.
OCH688C is void.
Note:
• This manual describes service
data of the outdoor units only.
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
PARTS CATALOG (OCB688)
June 2021
No. OCH688
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Summary of Contents for Mitsubishi Electric SUZ-KA18NA2
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Page 1: Table Of Contents
SPLIT-TYPE, AIR CONDITIONERS June 2021 No. OCH688 SERVICE MANUAL R410A REVISED EDITION-D Outdoor unit [Service Ref.] [Model Name] Revision: SUZ-KA18NA2.TH SUZ-KA18NA2 • Some descriptions have SUZ-KA18NAH2 been modified in REVISED SUZ-KA18NAH2.TH EDITION-D. SUZ-KA24NA2.TH OCH688C is void. SUZ-KA24NA SUZ-KA24NAH2 SUZ-KA24NAH2.TH Note: •... -
Page 2: Outdoor Units
COMBINATION OF INDOOR AND OUTDOOR UNITS Outdoor unit Indoor unit Heat pump type SUZ- Service Service Ref. KA18NA(H)2.TH KA24NA(H)2.TH KA30NA(H)2.TH KA36NA(H)2.TH Manual No. HWE08020 SEZ-KD18NA4.TH — — — BWE10180 OCH669 SLZ-KF18NA.TH — — — OCB669 PEAD-A18AA7.MX — — — — PEAD-A24AA7.MX —... -
Page 3: Specification
SPECIFICATION SUZ-KA18 SUZ-KA24 SUZ-KA30 SUZ-KA36 Outdoor unit model NA(H)2 NA(H)2 NA(H)2 NA(H)2 Power supply V , phase , Hz 208/230 , 1 , 60 Max. fuse size (time delay) Min. circuit ampacity Fan motor F.L.A 0.67 1.00 Model SNB130FQBMT SNB220FQGM1T R.L.A 10.0 13.0... -
Page 4: Outlines And Dimensions
OUTLINES AND DIMENSIONS SUZ-KA18NA(H)2.TH SUZ-KA24NA(H)2.TH SUZ-KA30NA(H)2.TH SUZ-KA36NA(H)2.TH Unit: inch REQUIRED SPACE *1 20 in. (500 mm) or more when front and sides of the unit are clear 16-7/16 Air in 1-9/16 Air in Air out 2-holes 13/32 13/16 6-7/8 19-11/16 *2 When any 2 sides of left, right and rear of the unit are clear 3-3/16... -
Page 5: Wiring Diagram
WIRING DIAGRAM SUZ-KA18NA2.TH OCH688D... - Page 6 SUZ-KA18NAH2.TH OCH688D...
- Page 7 SUZ-KA24NA2.TH SUZ-KA30NA2.TH SUZ-KA36NA2.TH OCH688D...
- Page 8 SUZ-KA24NAH2.TH SUZ-KA30NAH2.TH SUZ-KA36NAH2.TH OCH688D...
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Page 9: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM SUZ-KA18NA(H)2.TH Unit: inch (mm) Muffler 4-way Refrigerant pipe ø1/2 ( ø 12.7) valve (with heat insulator) Service port Stop valve (with service port) Strainer Outdoor #100 Flared connection Discharge heat Defrost temperature exchanger Service thermistor thermistor port RT62 RT61 Compressor... - Page 10 Outdoor unit ADDITIONAL REFRIGERANT CHARGE (R410A: oz.) NOTE: Refrigerant piping exceeding 25 ft. requires additional refrigerant charge according to the calculation. Refrigerant piping length (one way): ft. Outdoor unit Model precharged SUZ-KA18NA2 3 lb. 9 oz. 1.08 3.24 5.40 7.56 9.72 11.88...
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Page 11: Data
DATA STANDARD OPERATION DATA Representative matching SEZ-KD18NA4 SLZ-KF18NA PEAD-A18AA7 PEAD-A24AA7 Item Unit Cooling Heating Cooling Heating Cooling Heating Cooling Heating Capacity Btu/h 18000 21600 17700 19700 18000 21600 24000 25000 – 0.82 – 0.71 – 0.80 – 0.77 – Input 1.31 1.58 1.41... - Page 12 Representative matching PEAD-A30AA7 PEAD-A36AA7 SVZ-KP18NA SVZ-KP24NA Item Unit Cooling Heating Cooling Heating Cooling Heating Cooling Heating Capacity Btu/h 27000 30000 33000 33400 18000 21600 24000 25000 – 0.84 – 0.84 – 0.85 – 0.81 – Input 2.16 2.41 3.51 3.17 1.36 1.92 1.91...
- Page 13 Representative matching SVZ-KP30NA SVZ-KP36NA MLZ-KP18NA Item Unit Cooling Heating Cooling Heating Cooling Heating Capacity Btu/h 27000 30000 33400 33400 18000 20000 – – 0.84 – 0.67 – Input 2.16 2.06 3.71 3.03 1.44 1.77 Indoor unit SVZ-KP30NA SVZ-KP36NA MLZ-KP18NA Power supply (V, phase, Hz) 230, 1, 60 230, 1, 60 Input...
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Page 14: Actuator Control
ACTUATOR CONTROL 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 15 seconds Compressor... -
Page 15: Service Functions
SERVICE FUNCTIONS 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".) Defrost finish temperature Jumper SUZ-KA18NA(H)2 SUZ-KA24/30/36NA(H)2 Soldered... - Page 16 10-2. TROUBLE SHOOTING CHECK TABLE check No. Symptoms Condition Remedy code Abnormal point/ Condition indication Outdoor power system Overcurrent protection cut-out operates 3 consecutive times within 1 • Reconnect connector of compressor. minute after the compressor gets started. • Refer to “10-5.A How to check check Symptoms Condition...
- Page 17 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 re- mote controller at use is wireless type.
- Page 18 10-3-2. Remote controller check <PAR-3xMAA ("x" represents 0 or later)> If operations cannot be completed with the remote controller, diagnose the remote controller with this function. Select "Service" from the Main menu, and press the button. Maintenance password Remote controller check Select "Remote controller check"...
- Page 19 10-3-3. 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.
- Page 20 • Refer to the following tables for details on the check codes. [Output pattern A] Beeper sounds Beep Beep Beep Beep Beep Beep Beep OPERATION · · · Repeated INDICATOR lamp blink pattern Approx. 2.5 sec. 0.5 sec. 0.5 sec. 0.5 sec.
- Page 21 10-4. TROUBLE CRITERION OF MAIN PARTS SUZ-KA18NA(H)2.TH SUZ-KA24NA(H)2.TH SUZ-KA30NA(H)2.TH SUZ-KA36NA(H)2.TH Part name Check method and criterion Figure Defrost thermistor Measure the resistance with a tester. (RT61) Refer to “Inverter P.C. board” in "10-6. TEST POINT DIAGRAM AND Fin temperature VOLTAGE”, for the chart of thermistor. thermistor (RT64) Ambient temperature thermistor (RT65)
- Page 22 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. See 10-5. “Check of open phase”. Are the voltages balanced? Replace the inverter P.C. board. Check the compressor.
- Page 23 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>...
- Page 24 Replace the inverter P.C. board. without showing thermistor abnormality? (Cause is poor contact.) Connector, Pin No. Thermistor Symbol Board SUZ-KA18NA2 SUZ-KA24/30/36NA2 Defrost RT61 Between CN641 pin1 and pin2 Between CN671 pin1 and pin2 Discharge temperature RT62 Between CN641 pin3 and pin4 Between CN671 pin3 and pin4...
- Page 25 I Check of outdoor fan motor Check the connection between the connector CN931 and CN932. Is the resistance between each termi- nal of outdoor fan motor normal? (Refer to"10-4. TROUBLE CRITERION OF MAIN PARTS".) Disconnect CN932 from the inverter P.C. board, and turn on the power supply.
- Page 26 K Check of LEV Start Turn on power supply to the outdoor unit after checking Normal LEV coil is fixed to the LEV body securely. Is "click - click" sound heard? Or, do you feel vibration of the LEV coil with a hand? Disconnect the connector CN724 is there nor- Replace the inverter P.C.
- Page 27 M How to check miswiring and serial signal error Turn OFF the power supply. Is there rated voltage in the power supply? Check the power supply. Turn ON the power supply. Is there rated voltage between outdoor terminal block S1 and S2? Check the wiring.
- Page 28 N Check the defrost heater (base pan heater) SUZ-KA18/24/30/36NAH2 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.
- Page 29 P Electromagnetic noise enters into TV sets or radios Is the unit grounded? Ground the unit. Is the distance between the antennas Extend the distance between the antennas and and the indoor unit within 9.91 ft., or is the indoor unit, and/or the antennas and the the distance between the antennas and outdoor unit.
- Page 30 10-6. TEST POINT DIAGRAM AND VOLTAGE Inverter P.C. board SUZ-KA18NA(H)2.TH R.V.coil Smoothing Smoothing (CN721) Defrost heater Smoothing DB61 capacitor Back side of unit capacitor 208/230 V AC (CN722) capacitor (C61) 260 - 370 V DC (C62) (C63) 208/230 V AC Fuse (F801) Fuse (F901) Fuse (F701)
- Page 31 SUZ-KA24NA(H)2.TH SUZ-KA30NA(H)2.TH SUZ-KA36NA(H)2.TH Jumper wire for pre-heat control setting (JK) LEV (CN724) Jumper wire for changing defrost setting (JS) Ambient temperature thermistor/RT65 (CN672) Heater (CN601) Outdoor heat exchanger 208/230 V AC temperature thermistor R.V. coil (CN602) /RT68 (CN671) 208/230 V AC Discharge temperature thermistor/RT62 (CN671)
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Page 32: Function Setting
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>... - Page 33 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. Main Main menu Maintenance Initial setting *At the main display, the menu button and select "Service" to make the Service maintenance setting.
- Page 34 <Function setting> Select "Service" from the Main menu, and press the button. Test run Input maintenance info. Function setting Check Self check Select "Function setting" with the F1 or F2 button, and press the button. Function setting Set the indoor unit refrigerant addresses and unit numbers with the F1 Ref.
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Page 35: Disassembly Instructions
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. - Page 36 OPERATING PROCEDURE PHOTOS/FIGURES 2. Removing the inverter assembly, inverter P.C. board Photo 5 Screws of the terminal block (1) Remove the cabinet and panels. (Refer to 1.) Screw of the heat sink support and the back panel (2) Disconnect the lead wire to the reactor and the following con- support and the separator Screws of nectors:...
- Page 37 OPERATING PROCEDURE PHOTOS/FIGURES 4. Removing the discharge temperature thermistor, Photo 8 Outdoor heat exchanger tempera- defrost thermistor, outdoor heat exchanger tempera- Ambient tem- ture thermistor perature ture thermistor and ambient temperature thermistor thermistor (1) Remove the cabinet and panels. (Refer to 1.) (2) Disconnect the lead wire to the reactor and the following connectors: <Inverter P.C.
- Page 38 HEAD OFFICE : TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN CCopyright 2018 MITSUBISHI ELECTRIC CORPORATION Issued: Jun. 2021 No. OCH688 REVISED EDITION-D Issued: Aug. 2020 No. OCH688 REVISED EDITION-C Issued: Feb. 2020 No. OCH688 REVISED EDITION-B Specifications are subject to change without notice.
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