Mitsubishi Electric SUZ-KA24NAHZ Service Manual
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Mitsubishi Electric SUZ-KA24NAHZ Service Manual

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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
SERVICE MANUAL
[Service Ref.]
[Model Name]
SUZ-KA24NAHZ
SUZ-KA30NAHZ
SUZ-KA36NAHZ
SUZ-KA24NAHZ
R410A
SUZ-KA30NAHZ
SUZ-KA36NAHZ
CONTENTS
1. REFERENCE MANUAL ····························· 2
2. SAFETY PRECAUTION ····························· 2
3. FEATURES ············································· 6
4. SPECIFICATIONS ···································· 7
5. DATA······················································ 9
6. OUTLINES AND DIMENSIONS ················· 13
7. WIRING DIAGRAM ································· 15
8. WIRING SPECIFICATIONS ······················ 17
9. REFRIGERANT SYSTEM DIAGRAM ············ 20
10. TROUBLESHOOTING ····························· 23
11. EASY MAINTENANCE FUNCTION ············ 74
12. FUNCTION SETTING ······························ 76
14. DISASSEMBLY PROCEDURE ·················· 87
15. REMOTE CONTROLLER ························100
PARTS CATALOG (OCB754)
December 2020
No. OCH754
REVISED EDITION-A
Revision:
• Some descriptions
have been modified in
REVISED EDITION-A.
OCH754 is void.
Note:
• This manual describes
service data of the
outdoor units only.

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  • Page 1 SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS December 2020 No. OCH754 SERVICE MANUAL REVISED EDITION-A R410A [Service Ref.] Revision: [Model Name] • Some descriptions SUZ-KA24NAHZ SUZ-KA24NAHZ have been modified in REVISED EDITION-A. SUZ-KA30NAHZ SUZ-KA30NAHZ OCH754 is void. SUZ-KA36NAHZ SUZ-KA36NAHZ Note: • This manual describes service data of the outdoor units only.
  • Page 2 REFERENCE MANUAL INDOOR UNIT SERVICE MANUAL Service Manual No. Model Name Service Ref. Parts Catalog No. HWE1608A PEAD-A24/30/36AA7 PEAD-A24/30/36AA7 BWE01629A MD-1404-K019 SVZ-KP24/30/36NA SVZ-KP24/30/36NA MD-1404-K018 SAFETY PRECAUTION 2-1. ALWAYS OBSERVE FOR SAFETY Before obtaining access to terminal, all supply circuits must be disconnected. Preparation before the repair service.
  • Page 3 2-2. CAUTIONS RELATED TO NEW REFRIGERANT Cautions for units utilizing refrigerant R410A Use a vacuum pump with a reverse flow check Use new refrigerant pipes. valve. In the case of using the existing pipes for R22, be careful Vacuum pump oil may flow back into refrigerant cycle and with the following: that can cause deterioration of refrigerant oil, etc.
  • Page 4 [1] Cautions for service (1) Perform service after recovering the refrigerant left in unit completely. (2) Do not release refrigerant in the air. (3) After completing service, charge the cycle with specified amount of refrigerant. (4) When performing service, install a filter drier simultaneously. Be sure to use a filter drier for new refrigerant.
  • Page 5 2-3. CAUTIONS FOR REFRIGERANT PIPING WORK New refrigerant R410A is adopted for replacement inverter series. Although the refrigerant piping work for R410A is same as for R22, exclusive tools are necessary so as not to mix with different kind of refrigerant. Furthermore as the working pressure of R410A is 1.6 time higher than that of R22, their sizes of flared sections and flare nuts are different.
  • Page 6 FEATURES SUZ-KA24NAHZ SUZ-KA30NAHZ SUZ-KA36NAHZ CHARGELESS SYSTEM PRE-CHARGED REFRIGERANT IS SUPPLIED FOR PIPING LENGTH AT SHIPMENT. Maximum 100 ft, 30 m The refrigerant circuit with LEV(Linear Expansion Valve) and power receiver always control the optimal refrigerant level regardless of the length (maximum:100 ft [30 m] and minimum: 16 ft [5 m]) of piping. The additional refrigerant charg- ing work during installation often causes problems.
  • Page 7 SPECIFICATIONS Service Ref. SUZ-KA24NAHZ SUZ-KA30NAHZ Power supply Phase Single Cycle 60 Hz Voltage 208/230 V MOCP Breaker size External finish Munsell 3Y 7.8/1.1 Heat exchanger Plate fin coil Defrost method Reverse cycle Crankcase heater — Compressor Hermetic Model DNB28FBAMT ANB33FJMMT Motor output R.L.A.
  • Page 8 Service Ref. SUZ-KA36NAHZ Power supply Phase Single Cycle 60Hz Voltage 208/230 V MOCP Breaker size External finish Munsell 3Y 7.8/1.1 Heat exchanger Plate fin coil Defrost method Reverse cycle Crankcase heater — Compressor Hermetic Model ANB33FJMMT Motor output R.L.A. 18.0 L.R.A.
  • Page 9 80 ft 90 ft 100 ft Charged 20 m 24 m 27 m 30 m SUZ-KA24NAHZ SUZ-KA30NAHZ SUZ-KA36NAHZ For pipes longer than 70 ft, additional charge is required. 5-2. COMPRESSOR TECHNICAL DATA Winding temperature at 68°F [20°C] Service Ref. SUZ-KA24NAHZ...
  • Page 10 5-3. NOISE CRITERION CURVES SUZ-KA24NAHZ SUZ-KA30NAHZ SPL(dB) MODE LINE MODE SPL(dB) LINE SUZ-KA36NAHZ COOLING COOLING HEATING HEATING NC-70 NC-70 NC-60 NC-60 NC-50 NC-50 NC-40 NC-40 NC-30 NC-30 APPROXIMATE THRESHOLD OF HEARING FOR APPROXIMATE CONTINUOUS THRESHOLD OF NOISE HEARING FOR NC-20...
  • Page 11 Indoor unit model SVZ-KP24NA SVZ-KP30NA Phase Single Cycle 60 Hz Voltage 208/230 V Current 1.40 A 1.70 A Outdoor unit model SUZ-KA24NAHZ SUZ-KA30NAHZ Phase Single Single Cycle 60 Hz 60 Hz Voltage 208/230 V 208/230 V Current 9.12 A 9.08 A 7.69 A...
  • Page 12 Representative matching SVZ-KP36NA Mode COOLING HEATING Total Capacity Btu/h 36,000 37,000 Input 3,790 3,280 Indoor unit model SVZ-KP36NA Phase Single Cycle 60 Hz Voltage 208/230 V Current 2.70 A Outdoor unit model SUZ-KA36NAHZ Phase Single Cycle 60 Hz Voltage 208/230 V Current 13.78 A 11.56 A...
  • Page 13 OUTLINES AND DIMENSIONS Unit: mm<in> SUZ-KA24NAHZ OCH754A...
  • Page 14 Unit: mm<in> SUZ-KA30NAHZ SUZ-KA36NAHZ OCH754A...
  • Page 15 WIRING DIAGRAM SUZ-KA24NAHZ OCH754A...
  • Page 16 SUZ-KA30NAHZ SUZ-KA36NAHZ OCH754A...
  • Page 17 WIRING SPECIFICATIONS 8-1. INDOOR UNIT POWER SUPPLIED FROM OUTDOOR UNIT The following illustrations show available connection patterns. The outdoor unit power supply patterns vary on each model. 1:1 System Simultaneous twin system A Outdoor unit power supply B Wiring circuit breaker or isolating switch C Outdoor unit D Indoor unit/outdoor unit connecting cords E Remote controller...
  • Page 18 8-2. SEPARATE INDOOR UNIT/OUTDOOR UNIT POWER SUPPLIES The following illustrations show available connection patterns. The outdoor unit power supply patterns vary on models. 1:1 System The optional indoor power supply terminal kit is required. Outdoor unit power supply Wiring circuit breaker or isolating switch Outdoor unit Indoor unit/outdoor unit connecting cords Remote controller...
  • Page 19 8-3. INDOOR – OUTDOOR CONNECTING CABLE Wire No. o Size Outdoor power supply Max. 164 ft [50 m] Max. 262 ft [80 m] Max. 147 ft [45 m] Indoor unit-Outdoor unit 3 o AWG15 (polar) 3 o AWG13 (polar) 3 o AWG13 (polar) and S3 separated Note: The maximum cable length may vary depending on the condition of installation, humidity or materials, etc.
  • Page 20 REFRIGERANT SYSTEM DIAGRAM SUZ-KA24NAHZ Unit: in (mm) Thermistor TH7 (Ambient) Heat exchanger Thermistor Solenoid valve Ball valve Refrigerant (2-phase pipe) (4-way valve) GAS pipe connection ø5/8 (15.88) Strainer (#50) Charge plug Thermistor TH3 (High pressure) (Liquid) Charge plug Muffler High pressure...
  • Page 21 Refrigerant flow in heating Symbol Parts name Detail COMP Compressor DC inverter scroll compressor (Mitsubishi Electric Corporation) H/P SW High pressure switch (63H) For protection (OFF: 4.15MPa) REV/V Reversing (4-way) valve (21S4) Change the refrigerant circuit (Heating / Cooling) and for Defrosting...
  • Page 22 9-1. REFRIGERANT COLLECTING (PUMP DOWN) When relocating or disposing of the indoor/outdoor unit, pump down the system following the procedures below so that no refrig- erant is released into the atmosphere. 1 Turn off the power supply (circuit breaker). 2 Connect the low pressure valve on the gauge manifold to the charge plug (low pressure side) on the outdoor unit. 3 Close the liquid stop valve completely.
  • Page 23 TROUBLESHOOTING 10-1. TROUBLESHOOTING <Check code displayed by self-diagnosis and actions to be taken for service (summary)> Present and past check codes are logged, and they can be displayed on the control board of outdoor unit. Actions to be taken for service, which depends on whether or not the trouble is reoccurring in the field, are summarized in the table below. Check the contents below before investigating details.
  • Page 24 10-2. CHECK POINT UNDER TEST RUN 10-2-1. Before test run • After installation of indoor and outdoor units, piping work and electric wiring work, re-check that there is no refrigerant leak- age, loosened connections and incorrect polarity. • Measure impedance between the ground and the power supply terminal block (L1, L2) on the outdoor unit by 500 V Megger and check that it is 1.0 M"...
  • Page 25 • 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 s 0.5 s 0.5 s 0.5 s Approx.
  • Page 26 10-3. SELF-DIAGNOSIS ACTION TABLE <Abnormalities detected when the power is turned on> Note: Refer to indoor unit section for the codes starting with P and E. Check Code Abnormal point and detection method Cause Judgment and action 1 No voltage is supplied to termi- 1 Check following items.
  • Page 27 Abnormal point and detection method Cause Judgment and action Check Code 63H connector open 1 Disconnection or contact failure 1 Check connection of 63H connector on Abnormal if 63H connector circuit is open of 63H connector on outdoor outdoor controller circuit board. for 3 minutes continuously after power sup- controller circuit board Refer to "10-8.
  • Page 28 <Abnormalities detected while unit is operating> Abnormal point and detection method Judgment and action Check Code Cause High pressure (High pressure switch 1 Short cycle of indoor unit 1–6 Check indoor unit and repair defect. 63H worked) 2 Clogged filter of indoor unit Abnormal if high pressure switch 63H 3 Decreased airflow caused by worked (*) during compressor operation.
  • Page 29 Check Code Abnormal point and detection method Cause Judgment and action Open/short circuit of outdoor unit 1 Disconnection or contact failure 1 Check connection of connector (TH4, TH33) on temperature thermistor (TH4, TH33) of connectors (TH4, TH33) on the outdoor controller circuit board. Check break- Abnormal if open (37˚F [3°C] or less) or the outdoor controller circuit ing of the lead wire for TH4, TH33.
  • Page 30 Check Code Abnormal point and detection method Cause Judgment and action Too low superheat due to low discharge 1 Disconnection or loose connec- 12 Check the installation conditions of dis- temperature tion of discharge temperature charge temperature thermistor (TH4). Abnormal if discharge superheat is con- thermistor (TH4) tinuously detected less than or equal to 2 Defective holder of discharge...
  • Page 31 Check Code Abnormal point and detection method Cause Judgment and action Detailed Abnormal power synchronous 1 Distortion of power source 1 Check the field facility for the power supply. codes signal voltage, noise superimposition • No input of power synchronous 2 Disconnection or loose 2 Check earth wiring.
  • Page 32 Abnormal point and detection method Cause Judgment and action Check Code Abnormal low pressure (63L worked) 1 Stop valve of outdoor unit is 1 Check stop valve. Abnormal if 63L is worked (under −4 PSIG closed during operation. [−0.03 MPa]) during compressor operation. 2 Disconnection or loose con- 2–4 Turn the power off and on again to check 63L: Low pressure switch...
  • Page 33 Check Code Abnormal point and detection method Cause Judgment and action Remote controller transmission 1 2 remote controllers are set as 1 Set a remote controller to main, and the error(E3)/signal receiving error(E5) “main.” (In the case of 2 remote other to sub.
  • Page 34 Check Code Abnormal point and detection method Cause Judgment and action Non defined check code 1 Noise has entered transmission 12 Turn the power off, and on again to check. This code is displayed when non-defined wire of remote controller. Replace indoor controller board or outdoor check code is received.
  • Page 35 Check Code Abnormal point and detection method Cause Judgment and action Abnormal refrigerant circuit 1 When this error occurs, be sure to 1 Abnormal operation of 4-way During Cooling, Dry, or Auto Cooling replace the 4-way valve. valve operation, the following conditions are 2 Disconnection of or leakage in 2 Check refrigerant pipes for disconnection or regarded as failures when detected for 1...
  • Page 36 <M-NET communication error> Note: “Indoor unit” in the text indicates M-NET board in outdoor unit. Check Code Abnormal point and detection method Cause Judgment and action Address duplicate definition Search the unit with same address as abnormali- 1 There are 2 or more same This error is displayed when transmission address of controller of out- ty occurred.
  • Page 37 Abnormal point and detection method Cause Judgment and action Check Code NO ACK signal Common factor that has no rela- Always try the following when the error 1. Transmitting side controller detects tion with abnormality source. “A7” occurs. abnormal if a message was transmitted but there is no reply (ACK) that a mes- 1 The unit of former address 1 Turn off the power supply of outdoor unit...
  • Page 38 From the previous page. Abnormal point and detection method Cause Judgment and action Check Code 4. If displayed address or attribute is 1 During group operation with Same as mentioned in “A7” of the previous indoor unit of multi- refrigerant remote controller, page.
  • Page 39 Check Code Abnormal point and detection method Cause Judgment and action M-NET NO RESPONSE 1 Transmitting condition is 1 Check transmission waveform or noise on repeated fault because of Abnormal if a message was transmitted transmission wire. noise and the like. and there were reply (ACK) that message 2 Turn off the power supply of outdoor unit 2 Voltage drop and weak signal...
  • Page 40 Phenomena Factor Countermeasure 4. Even controlling by the IR wireless 1 The pair number settings of the IR wireless remote 1 Check the pair number settings. remote controller no beep is heard controller and indoor controller board are mismatched. and the unit does not start operat- ing.
  • Page 41 Symptoms: “Please Wait” is kept being displayed on the remote controller. Inspection method and Diagnosis flow Cause troubleshooting Check the display time of “Please Wait” after turning on the main power. 6 minutes 2 minutes or more or less How long is “Please Wait” •...
  • Page 42 LED display of the indoor controller board Symptoms: Nothing is displayed on the remote controller 1 LED1: LED2: LED3: Inspection method and Diagnosis flow Cause troubleshooting Check the voltage between S1 and S2 on the terminal block (TB4) of the indoor unit. 198 to 253 VAC? Check the voltage among L1 and L2 on the terminal block (TB1) of the...
  • Page 43 LED display of the indoor controller board Symptoms: Nothing is displayed on the remote controller 2 LED1: LED2: LED3: Inspection method and Diagnosis flow Cause troubleshooting Check the voltage between S1 and S2 on the terminal block (TB4) of the indoor unit. 198 to 253 VAC? Not lighting.
  • Page 44 LED display of the indoor controller board LED1: Symptoms: Nothing is displayed on the remote controller 3 LED2: LED3: — Inspection method and Diagnosis flow Cause troubleshooting Check the voltage of the terminal block (TB6) of the indoor unit. 10 to 16 VDC? •...
  • Page 45 • Before repair Frequent calls from customers Phone Calls From Customers How to Respond Note Unit does 1 The operating display of remote 1 Check if power is supplied to air conditioner. not operate controller does not come on. Nothing appears on the display unless power is at all.
  • Page 46 Phone Calls From Customers How to Respond Note The room cannot be cooled or heated sufficiently. 1 Check the set temperature of remote controller. The outdoor unit cannot be operated if the set temperature is not appropriate. The outdoor unit operates in the following modes. COOL: When the set temperature is lower than the room temperature.
  • Page 47 Phone Calls From Customers How to Respond Note Something 3 Air blows out for a while after However, this control is also 3 This is not a malfunction. is wrong HEAT operation is stopped. The blower is operating just for cooling down the applied to the models which with the heated-up air conditioner.
  • Page 48 Phone Calls From Customers How to Respond Note A white mist is expelled from the indoor unit. This is not a malfunction. This may occur when the operation is started in the room with high humidity. Water or moisture is expelled from the outdoor COOL: when pipes or piping joints are cooled, they unit.
  • Page 49 10-5. HOW TO CHECK THE PARTS Checkpoints Parts name Thermistor (TH3) Disconnect the connector then measure the resistance with a multimeter. <Liquid pipe> (Ambient temperature 50 to 86°F [10 to 30°C]) Thermistor (TH4) Normal Abnormal <Discharge> Thermistor (TH6) 160 to 410 kΩ TH33 <2-phase pipe>...
  • Page 50 Check method of DC fan motor (fan motor/outdoor controller circuit board) 1 Notes · High voltage is applied to the connector (CNF1, 2) for the fan motor. Pay attention to the service. · Do not pull out the connector (CNF1, 2) for the motor with the power supply on. (It causes trouble of the outdoor controller circuit board and fan motor.) 2 Self check Symptom: The outdoor fan cannot rotate.
  • Page 51 10-6. HOW TO CHECK THE COMPONENTS <Thermistor feature chart> Low temperature thermistors • Thermistor <Liquid pipe> (TH3) • Thermistor <2-phase pipe> (TH6) • Thermistor <Ambient> (TH7) • Thermistor <Suction pipe> (TH32) Thermistor R0 = 15 kΩ ± 3% B constant = 3480 ± 1% =15exp{3480( 273+t –...
  • Page 52 Linear expansion valve (KA24) (1) Operation summary of the linear expansion valve • Linear expansion valve opens/closes through stepping motor after receiving the pulse signal from the outdoor controller board. • Valve position can be changed in proportion to the number of pulse signal. <Connection between the outdoor controller board and the linear expansion valve>...
  • Page 53 Linear expansion valve (KA30/36) (1) Operation summary of the linear expansion valve • Linear expansion valve opens/closes through stepping motor after receiving the pulse signal from the outdoor controller board. • Valve position can be changed in proportion to the number of pulse signal. <Connection between the outdoor controller board and the linear expansion valve>...
  • Page 54 (3) How to attach and detach the coil of linear expansion valve <Composition> Linear expansion valve is separable into the main body and the coil as shown in the diagram below. Main body Stopper Coil Lead wire <How to detach the coil> Hold the lower part of the main body (shown as A) firmly so that the main body does not move and detach the coil by pulling it upward.
  • Page 55 10-7. EMERGENCY OPERATION (1) When any check codes shown below is displayed on outdoor unit, or microprocessor for wired remote controller or indoor unit has a failure while no other problems are found, emergency operation will be available by setting the emergency opera- tion switch (SWE) ON and short-circuiting the connector (CN31) on outdoor controller board.
  • Page 56 (5) Operation data during emergency operation During emergency operation, no communication is performed with the indoor unit, so the data items needed for operation are set to the following values: Operation mode Remarks Operation data COOL HEAT 81°F [27°C] 69°F [20.5°C] Intake temperature (TH1) 41°F [5°C] 113°F [45°C]...
  • Page 57 10-8. TEST POINT DIAGRAM <CAUTION> TEST POINT1 is high voltage. Outdoor controller circuit board Demand control setting Manual defrost, detect CNDM Model select history record reset, 1 to 2: Input of low-level refrigerant address CN3S sound priority Water heater CN51 mode Water heater Comp protect 1 to 3: Input of external...
  • Page 58 Outdoor power circuit board SUZ-KA24NAHZ Brief Check of POWER MODULE If they are short-circuited, it means that they are broken. Measure the resistance in the following points (connectors, etc.). 1. Check POWER MODULE 1 Check of DIODE circuit R – P1 S –...
  • Page 59 Outdoor power circuit board SUZ-KA30NAHZ Brief Check of POWER MODULE If they are short-circuited, it means that they are broken. SUZ-KA36NAHZ Measure the resistance in the following points (connectors, etc.). 1. Check POWER MODULE 1 Check of DIODE circuit R – P1 S –...
  • Page 60 10-9. FUNCTION OF SWITCHES, CONNECTORS AND JUMPERS (1) Function of switches The black square (■) indicates a switch position. Type Action by the switch operation Function Effective timing Switch switch When compressor is working Manual defrost* Start Normal in heating operation.* Abnormal history clear Clear Normal...
  • Page 61 Type of Action by the switch operation Switch Function Effective timing Switch No function — — — Power failure Auto recovery No auto recovery When power supply ON automatic recovery* No function — — — 3,4,5,6 Demand function Low noise mode Always Model select* —...
  • Page 62 Special function (a) Low-level sound priority mode (Local wiring) Unit enters into Low-level sound priority mode by external signal input setting. Inputting external signals to the outdoor unit decreases the outdoor unit operation sound 3 to 4 dB lower than that of usual. Adding a commercial timer or on-off switch contactor setting to the CNDM connector which is optional contactor for demand input located on the outdoor controller board enables to control compressor operation frequency.
  • Page 63 <Display function of inspection for outdoor unit> The blinking patterns of both LED1(green) and LED2(red) indicate the types of abnormality when it occurs. Types of abnormality can be indicated in details by connecting an optional part “A-Control Service Tool (PAC-SK52ST)” to con- nector CNM on outdoor controller board.
  • Page 64 Indication Error Outdoor controller Detailed board Check Contents Inspection method reference code* LED1 LED2 page (Green) (Red) 3 blinking 1 blinking Abnormality of Discharge Check if stop valves are open. temperature (TH4) and Comp. P.28 Check if connectors (TH4, TH33, LEV-A, and LEV-B) on outdoor surface temperature (TH33) controller board are not disconnected.
  • Page 65 <Outdoor unit operation monitor function> [When optional part “A-Control Service Tool(PAC-SK52ST)” is connected to outdoor controller board(CNM)] Digital indicator LED1 displays 2 digit number or code to inform operation condition and the meaning of check code by controlling DIP SW2 on “A-Control Service Tool”. Operation indicator SW2: Indicator change of self-diagnosis SW2 setting...
  • Page 66 The black square (■) indicates a switch position. SW2 setting Display detail Explanation for display Unit Pipe temperature / Liquid(TH3) −40 to 194 [−40 to 90˚C] −40 to 194 (When the coil thermistor detects 0˚F [0˚C] or below, “–” and temperature are displayed by turns.) ˚F [˚C] Example: When−10˚F;...
  • Page 67 The black square (■) indicates a switch position. SW2 setting Display detail Explanation for display Unit Pipe temperature / Liquid(TH3) on error −40 to 194 [−40 to 90˚C] occurring (When the coil thermistor detects 0˚F [0˚C] or below, “–” −40 to 194 and temperature are displayed by turns.) ˚F [˚C] Example: When −15˚F;...
  • Page 68 The black square (■) indicates a switch position. SW2 setting Display detail Explanation for display Unit 0 to 3 The number of connected indoor units (The number of connected indoor units are dis- played.) Unit 2 3 4 5 6 Capacity setting display Displayed as an outdoor capacity code Capacity...
  • Page 69 The black square (■) indicates a switch position. SW2 setting Display detail Explanation for display Unit Indoor setting temperature 62 to 86 [17 to 30˚C] 62 to 86 ˚F [˚C] 2 3 4 5 6 Outdoor pipe temperature/2-phase −38 to 190 [−39 to 88˚C] (TH6) (When the temperature is 0˚F [0˚C] or less, “–”...
  • Page 70 The black square (■) indicates a switch position. Unit SW2 setting Display detail Explanation for display 180 to 760 DC bus voltage (When it is 100 V or more, hundreds digit, tens 180 to 760 digit and ones digit are displayed by turns.) 2 3 4 5 6 0 to 100 Capacity save...
  • Page 71 The black square (■) indicates a switch position. SW2 setting Display detail Explanation for display Unit 0 to 480 LEV-C opening pulse on error occurring (When it is 100 pulse or more, hundreds digit, tens 0 to 480 digit and ones digit are displayed by turns.) Example: When 130 pulse;...
  • Page 72 The black square (■) indicates a switch position. SW2 setting Display detail Explanation for display Unit 0 to 327 [0 to 182°C] Discharge superheat on error occurring (When the temperature is 100˚F or more, hundreds digit, tens digit and ones digit are 0 to 327 displayed by turns.) ˚F [°C]...
  • Page 73 ■ The black square ( ) indicates a switch position. SW2 setting Display detail Explanation for display Unit Outdoor suction pipe temperature (TH32) −38 to 190 [−39 to 88°C] −38 to 190 (When the temperature is 0˚F [0°C] or less, “–” and temperature are displayed by turns.) Example: When −15°C;...
  • Page 74 EASY MAINTENANCE FUNCTION 11-1. SMOOTH MAINTENANCE <PAR-4xMAA ("x" represents 0 or later)> Refer to "15-9. SMOOTH MAINTENANCE" for operation procedure. Maintenance data, such as the indoor/outdoor unit’s heat exchanger temperature and compressor operation current can be dis- played with “Smooth maintenance”. This cannot be executed during test operation.
  • Page 75 11-2. Guide for operation condition Checkpoints Enter the temperature differences between into the graph given below. Operation state is determined according to the plotted areas on the graph. For data measurements, set the fan speed to "Hi" before activating maintenance mode. Inspection item Result Classification...
  • Page 76 FUNCTION SETTING 12-1. UNIT FUNCTION SETTING BY THE REMOTE CONTROLLER Each function can be set set as necessary 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. (1) Functions available when setting the unit number to 00 (Select 00 referring to 4 setting the indoor unit number.) <Table 1>...
  • Page 77 (2) Functions available when setting the unit number to 01-03 or AL (07 in the case of the IR wireless remote controller) • When setting functions for an indoor unit in an independent system, set the unit number to 01 referring to 4 setting the indoor unit number.
  • Page 78 MONITORING THE OPERATION DATA BY THE REMOTE CONTROLLER 13-1. HOW TO "MONITOR THE OPERATION DATA" Refer to "15-10. REQUEST CODE" when monitoring the operation data. 13-2. REQUEST CODE LIST Certain indoor/outdoor combinations do not have the request code function; therefore, no request codes are displayed. Description Request content Unit...
  • Page 79 Description Request content Unit Remarks (Display range) Thermostat ON operating time 0 – 999 Minutes Test run elapsed time 0 – 120 Minutes Not possible to activate maintenance mode during the test run. Indoor unit-Control state – Refer to 13-2-1.Detail Contents in Request Code. Outdoor unit-Control state –...
  • Page 80 Description Request content Unit Remarks (Display range) Displays postponement code. (" - - " is Outdoor unit - Error postponement history 1 (latest) Code displayed if no postponement code is present) Displays postponement code. (" - - " is Outdoor unit - Error postponement history 2 (previous) Code displayed if no postponement code is present) Displays postponement code.
  • Page 81 Description Request content Unit Remarks (Display range) – Indoor-Actual intake air temperature −38 ˚F Indoor - Liquid pipe temperature −38 – ˚F – Indoor-Cond./Eva. pipe temperature −38 ˚F Indoor-Fan operating time 0 – 9999 1 hour (After filter is reset) Indoor-Total operating time 0 –...
  • Page 82 13-2-1. Detail Contents in Request Code Example) Request code "004" Request code Discharge temperature 156°F Ref.address Request code Refrigerant address "00" Request: SELECT Cursor [Operation state] (Request code: "0" ) Relay output state Power currently Data display Display Compressor Four-way valve Solenoid valve supplied to compressor –...
  • Page 83 [Fan control state] (Request code: "53 ") Data display Fan step correction value by heatsink temperature overheat prevention control Fan step correction value by cool condensation temperature overheat prevention control Display Correction value - (minus) – 1 [Actuator output state] (Request code : "54") Data display Actuator output state 1 Actuator output state 2...
  • Page 84 [Contact demand capacity] (Request code: "61") Setting content Data display Setting Display Setting value Setting content SW7-1 SW7-2 100% [External input state] (Request code: "62") Input state : Input position Data display Contact demand Silent mode Spare 1 Spare 2 Display Input state input...
  • Page 85 [Outdoor unit switch setting display (SW1 to SW10, except SW3)] Request codes: "73 to 82" 0: Switch OFF 1: Switch ON 0: Switch OFF 1: Switch ON SW1, SW2, SW6, SW7 Data display Data display 00 00 00 00 00 01 00 01 00 02 00 02...
  • Page 86 [Indoor unit – Model setting information] (Request code : "162") Data display Display Model setting state Display Model setting state See the table on the right. SVZ-KP·NA PEA-A·AA [Indoor unit – Capacity setting information] (Request code: "163" ) Data display Display Capacity setting state Display...
  • Page 87 DISASSEMBLY PROCEDURE SUZ-KA24NAHZ : Indicates the visible parts in the photos/figures. OPERATING PROCEDURE PHOTOS/FIGURES 1. Removing the service panel and top panel Photo 1 Top panel fixing screws (1) Remove 3 service panel fixing screws (5 × 12) and slide...
  • Page 88 OPERATING PROCEDURE PHOTOS/FIGURES Photo 5 4. Removing the thermistor <Liquid> (TH3) and thermistor Thermistor Electrical parts box <2-phase pipe> (TH6) <2-phase pipe> (TH6) (1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) Thermistor Controller <Ambient>...
  • Page 89 OPERATING PROCEDURE PHOTOS/FIGURES 7. Removing the 4-way valve coil (21S4), LEV coil (LEV(A), Photo 8 LEV(B)) 4-way valve coil 4-way valve fixing screw (1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) (3) Remove the electrical parts box. (See Photo 4) [Removing the 4-way valve coil] (4) Remove 4-way valve coil fixing screw (M4 ×...
  • Page 90 OPERATING PROCEDURE PHOTOS/FIGURES Photo 9 10. Removing the high pressure switch (63H) Lead wire of (1) Remove the service panel. (See Photo 1) high pressure switch (2) Remove the top panel. (See Photo 1) (3) Remove the electrical parts box. (See Photo 4) (4) Remove 3 right side panel fixing screws (5 ×...
  • Page 91 OPERATING PROCEDURE PHOTOS/FIGURES 12. Removing the compressor (MC) Photo 11 (1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) (3) Remove 2 front cover panel fixing screws (5 × 12) and remove the front cover panel. (See Photo 1) (4) Remove 2 back cover panel fixing screws (5 ×...
  • Page 92 OPERATING PROCEDURE PHOTOS/FIGURES 14. Removing the base heater Photo 13 (1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) (3) Remove the upper 2 screws (5 × 12) fixing the motor support, the lower 2 screws (5 × 12) fixing the base and the screw (4 ×...
  • Page 93 SUZ-KA30NAHZ SUZ-KA36NAHZ : Indicates the visible parts in the photos/figures. : Indicates the invisible parts in the photos/figures. OPERATING PROCEDURE PHOTOS/FIGURES 1. Removing the service panel and top panel Photo 1 (1) Remove 3 service panel fixing screws (5 × 12) and slide the hook on the right downward to remove the service Top panel fixing screws Top panel...
  • Page 94 OPERATING PROCEDURE PHOTOS/FIGURES 3. Removing the electrical parts box Photo 4 (1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) (3) Disconnect the indoor/outdoor connecting wire and the Controller circuit board (C.B.) power supply wire from terminal block. Electrical (4) Disconnect the connector CNF1, CNF2, SV2, LEV-A, parts box...
  • Page 95 OPERATING PROCEDURE PHOTOS/FIGURES 4. Removing the thermistor <2-phase pipe> (TH6) and Photo 5 thermistor <Ambient>(TH7) (1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) Electrical parts (3) Disconnect the connectors TH7/6 (red) on the controller cir- cuit board in the electrical parts box.
  • Page 96 OPERATING PROCEDURE PHOTOS/FIGURES 5. Removing the thermistor <Discharge> (TH4) Photo 7 (1) Remove the service panel. (See Photo 1) (2) Disconnect the connector TH4 (white) on the controller cir- Separator Muffler cuit board in the electrical parts box. Loosen fasteners for lead wires in the electrical parts box. (3) Loosen clamps for the lead wire on the separator (See Photo 7).
  • Page 97 OPERATING PROCEDURE PHOTOS/FIGURES 7. Removing the 4-way valve coil (21S4), and linear expansion Photo 9 valve coil (LEV-A, LEV-B, LEV-C) (1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) (3) Remove the electrical parts box. (See Photo 4) High pressure LEV coil LEV coil...
  • Page 98 OPERATING PROCEDURE PHOTOS/FIGURES Photo 10 11. Removing the reactor (DCL) (1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) Electrical parts box Reactors (DCL) (3) Remove the electrical parts box. (See Photo 4) (4) Remove 6 reactor fixing screws (4 ×...
  • Page 99 OPERATING PROCEDURE PHOTOS/FIGURES 14. Removing the base heater Photo 12 (1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) (3) Remove the upper 2 screws (5 × 12) fixing the motor support, the lower 3 screws (5 × 12) fixing the base and the 2 screws (4 ×...
  • Page 100 REMOTE CONTROLLER 15-1. REMOTE CONTROLLER FUNCTIONS <PAR-40MAA> Controller interface The functions of the function buttons change depending on the screen. Refer to the button function guide that appears at the bottom of the LCD for the functions they serve on a given screen. When the system is centrally controlled, the button function guide that corresponds to the locked button will not appear.
  • Page 101 Display The main display can be displayed in two different modes: “Full” and “Basic”. The initial setting is “Full”. To switch to the “Basic” mode, change the setting on the Main display setting. (Refer to operation manual included with remote controller.) <Full mode>...
  • Page 102 Menu structure Main menu Press the button. MENU Move the cursor to the desired item with the buttons, and press the button. SELECT Operation Vane · Louver · Vent. (Lossnay) High power Comfort Manual vane angle 3D i-See sensor Timer menu Timer ON/OFF timer Auto-OFF timer...
  • Page 103 Continue from the previous page. Maintenance menu Error information Filter information Cleaning Auto descending panel Descending operation Descending adjustment Service menu Test run menu Test run Drain pump test run Maintenance information Model name input Serial No. input Dealer information input Initialize maintenance info.
  • Page 104 Main menu list Main Setting and display items Setting details menu Operation Vane · Louver · Vent. Use to set the vane angle. (Lossnay) • Select a desired vane setting. Use to turn ON/OFF the louver. • Select a desired setting from "ON" and "OFF." Use to set the amount of ventilation.
  • Page 105 Setting and display Main menu Setting details items Initial Display Main display Use to switch between "Full" and "Basic" modes for the Main display, and use setting setting to change the background colors of the display to black. Display de- Make the settings for the remote controller related items as necessary.
  • Page 106 <PAR-SL97A-E> Controller interface Transmission area Transmission indicator Remote controller display Timer indicator *For explanation purposes, all of the items that appear in the display are shown. *All items are displayed when the Reset button is pressed. Operation areas ON/OFF button Temperature setting buttons Fan Speed button (Changes fan speed) Timer Off button...
  • Page 107 <PAR-SL100A-E> Controller interface Transmission area Remote controller display Set Temperature buttons OFF/ON button Mode button (Changes operation mode) Fan Speed button (Changes fan speed) Airflow button (Changes up/ i-see button* down airflow direction) Timer ON button Menu button Timer OFF button SET/SEND button Weekly timer ON/OFF button* CANCEL button...
  • Page 108 15-2. ERROR INFORMATION When an error occurs, the following screen will appear. Check the error status, stop the operation, and consult your dealer. 1. Check code, error unit, refrigerant address, unit model name, and Error information serial number will appear. Error code The model name and serial number will appear only if the informa- Error unit...
  • Page 109 ･ Checking the error information Maintenance menu While no errors are occurring, page 2/2 of the error information can be Error information viewed by selecting "Error information" from the Maintenance menu. Filter information Errors cannot be reset from this screen. Cleaning Main menu: RETURN Cursor...
  • Page 110 15-3. SERVICE MENU Maintenance password is required 1. Select "Service" from the Main menu, and press the [SELECT] button. Main Main menu *At the main display, the menu button and select "Service" to make the Service maintenance setting. 2. When the Service menu is selected, a window will appear asking for the pass- Service menu word.
  • Page 111 15-4. TEST RUN 15-4-1. PAR-40MAA 1. Select "Service" from the Main menu, and press the [SELECT] button. Test run Input maintenance info. Settings Check Select "Test run" with the F1 or F2 button, and press the [SELECT] button. Others : RETURN SELECT MENU RETURN...
  • Page 112 15-4-2. PAR-SL97A-E Measure an impedance between the power supply terminal block on the outdoor unit and ground with a 500V Megger and check that it is equal to or greater than 1.0M". TEST RUN 1 Turn on the main power to the unit. TEST RUN 2 Press the button twice continuously.
  • Page 113 15-5. FUNCTION SETTING 15-5-1. PAR-40MAA Settings menu Function setting 1. Select "Service" from the Main menu, and press the [SELECT] button. Select "Setting" from the Service menu, and press the [SELECT] button. Service menu: MENU Select "Function setting", and press the [SELECT] button. SELECT MENU RETURN...
  • Page 114 15-5-2. PAR-SL97A-E Functions can be selected with the wireless remote controller. Function selection using wireless remote controller is available only for refriger- ant system with wireless function. Refrigerant address cannot be specified by the wireless remote controller. [Flow of function selection procedure] Flow of function selection procedure The flow of the function selection procedure is shown below.
  • Page 115 15-5-3. PAR-SL100A-E 1. Going to the function select mode Press the button between of 5 seconds. (Start this operation from the status of remote controller display turned off.) [CHECK] is lit and "00" blinks. (Fig. 15-1) Press the button to set the "50". Direct the wireless remote controller toward the receiver of the indoor unit and press the button.
  • Page 116 15-6. ERROR HISTORY 1. Select "Service" from the Main menu, and press the [SELECT] button. Test run Input maintenance info. Settings Check Others : RETURN Select "Check" with the F1 or F2 button, and press the [SELECT] button. SELECT MENU RETURN HOLD 2.
  • Page 117 15-7. SELF-DIAGNOSIS 15-7-1. PAR-40MAA 1. Select "Service" from the Main menu, Diagnosis and press the [SELECT] button. Self check Remote controller check Select "Check" from the Service menu, and press the [SELECT] button. Service menu: MENU Cursor Select "Diagnosis" from the Check menu, and press the [SELECT] button.
  • Page 118 15-7-2. PAR-SL97A-E 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> Refrigerant [Procedure] address display 1. Press the CHECK button twice. CHECK •...
  • Page 119 15-8. REMOTE CONTROLLER CHECK If operations cannot be completed with the remote controller, diagnose the remote controller with this function. 1. Select "Service" from the Main menu, and Diagnosis press the [SELECT] button. Self check Remote controller check Select "Check" from the Service menu, and press the [SELECT] button.
  • Page 120 15-9. SMOOTH MAINTENANCE Check menu 1. Select "Service" from the Main menu, and press the [SELECT] button. Error history Diagnosis Smooth maintenance Request code Select "Check" with the F1 or F2 button, and press the [SELECT] button. Service menu: MENU Cursor Select "Smooth maintenance"...
  • Page 121 ■ Refrigerant address Single refrigerant system Multi refrigerant system (group control) In the case of single refrigerant system, the refrigerant address Up to 16 refrigerant systems (16 outdoor units) can be con- is "00" and no operation is required. nected as a group by 1 remote controller. To check or set the Simultaneous twin, triple units belong to this category refrigerant addresses.
  • Page 122 HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN CCopyright 2020 MITSUBISHI ELECTRIC CORPORATION Issued: Dec. 2020 No. OCH754 REVISED EDITION-A Published: Oct. 2020 No. OCH754 Specifications are subject to change without notice. Made in Japan...

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