Mitsubishi Electric PUZ-ZM35VKA2 Service Manual
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Mitsubishi Electric PUZ-ZM35VKA2 Service Manual

Split-type, heat pump air conditioners
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Table of Contents

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
SERVICE MANUAL
Outdoor unit
[Model Name]
PUZ-ZM35VKA2
PUZ-ZM50VKA2
PUZ-ZM35VKA2-ET
PUZ-ZM50VKA2-ET
PUZ-ZM35VKA2-ER
PUZ-ZM50VKA2-ER
[Service Ref.]
PUZ-ZM35VKA2
PUZ-ZM50VKA2
PUZ-ZM35VKA2-ET
PUZ-ZM50VKA2-ET
PUZ-ZM35VKA2-ER
PUZ-ZM50VKA2-ER
R32
CONTENTS
1. REFERENCE MANUAL ······················ 2
2. SAFETY PRECAUTION ······················ 2
3. FEATURES ····································· 12
4. SPECIFICATIONS ···························· 13
5. DATA ············································· 14
6. OUTLINES AND DIMENSIONS ·········· 16
7. WIRING DIAGRAM ·························· 17
8. WIRING SPECIFICATIONS ················ 18
10. TROUBLESHOOTING ······················ 25
11. FUNCTION SETTING ······················· 72
BY THE REMOTE CONTROLLER ······ 73
14. DISASSEMBLY PROCEDURE ··········· 82
15. REMOTE CONTROLLER ·················· 87
PARTS CATALOG (OCB751)
September 2021
No. OCH751
Note:
• This manual describes ser-
vice data of the outdoor
units only.

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Summary of Contents for Mitsubishi Electric PUZ-ZM35VKA2

  • Page 1: Table Of Contents

    SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS September 2021 No. OCH751 SERVICE MANUAL Outdoor unit [Model Name] [Service Ref.] Note: PUZ-ZM35VKA2 PUZ-ZM35VKA2 • This manual describes ser- PUZ-ZM50VKA2 vice data of the outdoor PUZ-ZM50VKA2 units only. PUZ-ZM35VKA2-ET PUZ-ZM35VKA2-ET PUZ-ZM50VKA2-ET PUZ-ZM50VKA2-ET PUZ-ZM35VKA2-ER PUZ-ZM35VKA2-ER...

  • Page 2: Reference Manual

    REFERENCE MANUAL INDOOR UNIT SERVICE MANUAL Service manual No. Model Name Service Ref. Parts catalog No. PLA-ZM35/50EA2 PLA-ZM35/50EA2.UK – PLA-ZM35/50EA2-ET PLA-ZM35/50EA2-ET.UK – PLA-ZM35/50EA2-ER PLA-ZM35/50EA2-ER.UK PLA-M35/50EA2 PLA-M35/50EA2.UK – PLA-M35/50EA2-ET PLA-M35/50EA2-ET.UK – PLA-M35/50EA2-ER PLA-M35/50EA2-ER.UK PKA-M35/50LA2 PKA-M35/50LA2.UK PKA-M35/50LA2-ET PKA-M35/50LA2-ET.UK PKA-M35/50LA2-ER PKA-M35/50LA2-ER.UK – PKA-M35/50LAL2 PKA-M35/50LAL2.UK –...
  • Page 3 2-1. ALWAYS OBSERVE FOR SAFETY Before obtaining access to terminal, all supply circuits must be disconnected. 2-2. CAUTIONS RELATED TO NEW REFRIGERANT Cautions for units utilizing refrigerant R32 Preparation before the repair service Precautions during the repair service • Prepare the proper tools. •...
  • Page 4 [1] Warning for service (1) Do not alter the unit. (2) For installation and relocation work, follow the instructions in the Installation Manual and use tools and pipe components specifically made for use with refrigerant specified in the outdoor unit installation manual. (3) Ask a dealer or an authorized technician to install, relocate and repair the unit.
  • Page 5 [4] Cautions for unit using R32 refrigerant Basic work procedures are the same as those for conventional units using refrigerant R410A. However, pay careful attention to the following points. (1) Information on servicing (1-1) Checks on the Area Prior to beginning work on systems containing flammable refrigerants, safety checks are necessary to ensure that the risk of ignition is minimized.
  • Page 6 (3) Repair to intrinsically Safe Components Do not apply any permanent inductive or capacitance loads to the circuit without ensuring that this will not exceed the permissible voltage and current permitted for the equipment in use. Intrinsically safe components are the only types that can be worked on while live in the presence of a flammable atmos- phere.
  • Page 7 b) Isolate system electrically. c) Before attempting the procedure, ensure that: • mechanical handling equipment is available, if required, for handling refrigerant cylinders; • all personal protective equipment is available and being used correctly; • the recovery process is supervised at all times by a competent person; •...
  • Page 8 [5] Service tools Use the below service tools as exclusive tools for R32 refrigerant. Tool name Specifications Gauge manifold · Only for R32 · Use the existing fitting specifications . (UNF1/2) · Use high-tension side pressure of 5.3MPa·G or over. Charge hose ·...
  • Page 9 (2) Cautions for refrigerant piping work New refrigerant R32 is adopted for replacement inverter series. Although the refrigerant piping work for R32 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 R32 is 1.6 times higher than that of R22, their sizes of flared sections and flare nuts are different.
  • Page 10 2-4. Choosing the outdoor unit installation location R32 is heavier than air—as well as other refrigerants— Correct Correct so tends to accumulate at the base (in the vicinity of the floor). If R32 accumulates around base, it may reach a flammable concentration in case room is small.
  • Page 11 C) Create an appropriate ventilation open area. Make sure that the width of the open area is 0.9 [m] or more and the height of the open area is 0.15 [m] or more. However, the height from the bottom of the installation space to the bottom edge of the open area should be 0.125 [m] or less.

  • Page 12: Features

    FEATURES PUZ-ZM35VKA2(-ET/-ER) PUZ-ZM50VKA2(-ET/-ER) CHARGELESS SYSTEM PRE-CHARGED REFRIGERANT IS SUPPLIED FOR PIPING LENGTH AT SHIPMENT Maximum 30 m The refrigerant circuit with LEV (Linear Expansion Valve) and power receiver always control the optimal refrigerant level regardless of the length (30 m maximum and 5 m minimum) of piping. The additional refrigerant charging work during instal- lation often causes problems.

  • Page 13: Specifications

    SPECIFICATIONS Service Ref. PUZ-ZM35VKA2(-ET/-ER) PUZ-ZM50VKA2(-ET/-ER) Mode Cooling Heating Cooling Heating Power supply (phase, cycle, voltage) Single, 230V, 50Hz Max. current External finish Munsell 3Y 7.8/1.1 Refrigerant control Linear Expansion Valve Compressor Hermetic Model SVB140FFSM Motor output Starter type Inverter Protection devices HP switch, Comp.

  • Page 14: Data

    Service Ref. 10 m 20 m 30 m 40 m 50 m 55 m 75 m charged PUZ-ZM35VKA2(-ET/-ER) 2.15 — — PUZ-ZM50VKA2(-ET/-ER) Additional charge is required for pipes longer than 30 m. 5-2. COMPRESSOR TECHNICAL DATA (Winding temperature at 20:) PUZ-ZM35VKA2(-ET/-ER) Service Ref.
  • Page 15 1.11 1.36 Indoor unit PLA-ZM35EA2(-ET/-ER) PLA-ZM50EA2(-ET/-ER) Phase, Hz 1, 50 1, 50 Voltage Current 0.21 0.19 0.22 0.20 Outdoor unit PUZ-ZM35VKA2(-ET/-ER) PUZ-ZM50VKA2(-ET/-ER) Phase, Hz 1, 50 1, 50 Voltage Current 3.17 3.53 4.80 5.85 Discharge pressure MPaG 2.51 2.04 2.68 2.44...

  • Page 16: Outlines And Dimensions

    OUTLINES AND DIMENSIONS Unit: mm OCH751...

  • Page 17: Wiring Diagram

    WIRING DIAGRAM OCH751...

  • Page 18: Wiring Specifications

    WIRING SPECIFICATIONS 8-1. FIELD ELECTRICAL WIRING (power wiring specifications) Outdoor unit model ZM35/50 Outdoor unit power supply ~/N (single), 50 Hz, 230 V Outdoor unit input capacity main switch (Breaker) 16 A Outdoor unit power supply 3 × Min. 1.5 Indoor unit-Outdoor unit 3 ×...
  • Page 19 8-2. SEPARATE INDOOR UNIT/ OUTDOOR UNIT POWER SUPPLIES The following illustration show available connection patterns. The outdoor unit power supply patterns vary on models. 1:1 System A Outdoor unit power supply The optional indoor power supply terminal kit is required. B Earth leakage breaker C Wiring circuit breaker or isolating switch D Outdoor unit...
  • Page 20 8-3. INDOOR – OUTDOOR CONNECTING CABLE The cable shall not be lighter than design 60245 IEC or 60227 IEC. Wire No. o Size (mm²) Outdoor power supply Max. 45 m Max. 50 m Max. 80 m Indoor unit-Outdoor unit 3 o 1.5 (polar) 3 o 2.5 (polar) 3 o 2.5 (polar) and S3 separated Indoor unit-Outdoor unit earth...
  • Page 21 8-4. M-NET WIRING METHOD Points to note: (1) Outside the unit, transmission wires should stay away from electric wires in order to prevent electromagnetic noise from making an influence on the signal communication. Place them at intervals of more than 5 cm. Do not put them in the same conduit tube.
  • Page 22 M-NET wiring (1) Use 2-core × 1.25mm² shield wire for electric wires. M-NET terminal (Excluding the case connecting to system controller.) Earth block wire (2) Connect the wire to the M-NET terminal block. Connect one core of the transmission wire (non-polar) to A terminal and the other to B. Peel the shield wire, twist the shield part to a string and connect it to S terminal.

  • Page 23: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM Unit: mm (inch) Thermistor TH7 Heat exchanger <Ambient> Stop valve Charge plug Thermistor TH6 Solenoid valve (with service port) <2-phase pipe> (4-way valve) Refrigerant GAS pipe connection(1/2F) Strainer Thermistor TH3 <Liquid> Muffler Distributor High pressure switch 63H Thermistor TH4 <Discharge>...
  • Page 24 9-1. REFRIGERANT COLLECTING (PUMP DOWN) When relocating or disposing of the indoor/outdoor unit, pump down the system following the procedure below so that no refriger- ant 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 25: Troubleshooting

    TROUBLESHOOTING 10-1. TROUBLESHOOTING <Checkcode 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 wired remote controller and control board of out- door unit. Actions to be taken for service, which depends on whether or not the trouble is reoccurring in the field, are summa- rized in the table below.
  • Page 26 • 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 27 10-3. SELF-DIAGNOSIS ACTION TABLE <Abnormalities detected when the power is put on> Note: Refer to indoor unit section for code P and code E. Checkcode Abnormal points and detection method Cause judgment and action 1 No voltage is supplied to termi- 1 Check following items.
  • Page 28 Checkcode Abnormal points and detection method Cause judgment and action Miswiring of indoor/outdoor unit 1 Contact failure or miswiring of 1 Check disconnection or looseness or polarity connecting wire indoor/outdoor unit connecting of indoor/outdoor unit connecting wire of Outdoor controller circuit board can wire indoor and outdoor units.
  • Page 29 <Abnormalities detected while unit is operating> Checkcode Abnormal points and detection method Cause judgment and action High pressure (High pressure switch 1 Short cycle of indoor unit 1–6 Check indoor unit and repair defect. 63H operated) 2 Clogged filter of indoor unit 3 Decreased airflow caused by Abnormal if high pressure switch 63H dirt of indoor fan...
  • Page 30 Checkcode Abnormal points and detection method Cause judgment and action Open/short of outdoor unit thermistors 1 Disconnection or contact fail- 1 Check connection of connector (TH3,TH6/ (TH3, TH6, TH7, and TH8) ure of connectors TH7,TH8(CN3)) on the outdoor controller circuit Abnormal if open or short is detected during Outdoor controller circuit board.
  • Page 31 Checkcode Abnormal points and detection method Cause Judgment and action To find out the detail history (latest) about U9 error, turn ON SW2-1, 2-2 and 2-6. Detailed codes Refer to "10-9. FUNCTION OF SWITCHES, CONNECTORS AND JUMPERS". Overvoltage error 1 Abnormal increase in power source 1 Check the field facility for the power supply.
  • Page 32 Checkcode Abnormal points and detection method Cause Judgment and action Overheat protection 1 Defective outdoor fan (fan motor) 1 Check outdoor unit air passage. Abnormal if outdoor pipe thermistor (TH3) or short cycle of outdoor unit during detects 70°C or more during compressor cooling operation operation.
  • Page 33 Checkcode Abnormal points and detection method Cause Judgment and action Compressor overcurrent interruption 1 Stop valve of outdoor unit is closed. 1 Open stop valve. Abnormal if overcurrent DC bus or com- 2 Decrease of power supply voltage 2 Check facility of power supply. pressor is detected after compressor starts 3 Looseness, disconnection or reverse 3 Correct the wiring (U...
  • Page 34 Checkcode Abnormal points and detection method Cause Judgment and action Remote controller transmission error 1 2 remote controllers are set as “main.” 1 Set a remote controller to main, and the (E3)/signal receiving error (E5) (In the case of 2 remote controllers) other to sub.
  • Page 35 Checkcode Abnormal points and detection method Cause Judgment and action Non defined check code 1 Noise has entered transmission wire 12 Turn the power off, and on again to This code is displayed when non-defined of remote controller. check. check code is received. 2 Noise has entered indoor/ outdoor Replace indoor controller board or unit connecting wire.
  • Page 36 Checkcode Abnormal points and detection method Cause Judgment and action Abnormal refrigerant circuit 1 Abnormal operation of 4-way valve 1 When this error occurs, be sure to During Cooling, Dry, or Auto Cooling replace the 4-way valve. operation, the following conditions are 2 Disconnection of or leakage in 2 Check refrigerant pipes for disconnection regarded as failures when detected for 1...
  • Page 37 Checkcode Abnormal points and detection method Cause Judgment and action NO ACK signal Common factor that has no relation with Always try the following when the abnormality source 1. Transmitting side controller detects error “A7” occurs. 1 The unit of former address does not abnormal if a message was transmitted exist as address switch has changed but there is no reply (ACK) that a...
  • Page 38 From the previous page. Checkcode Abnormal points and detection method Cause Judgment and action 5. If displayed address or attribute is Same as mentioned in “A7” of the pre- 1 During sequential operation of indoor unit and FRESH MASTER of other FRESH MASTER, indoor unit detects vious page.
  • Page 39 10-4. TROUBLESHOOTING OF PROBLEMS Phenomena Factor Countermeasure 1. Remote controller display does not 1 12 VDC is not supplied to remote controller. 1 C heck LED2 on indoor controller board. work. (1) When LED2 is lit: Check the remote controller wiring for breaking or contact failure.
  • Page 40 Phenomena Factor Countermeasure 7. Remote controller display works 1 • Discharging temperature and indoor 1 Linear expansion valve fault normally and the unit performs Opening cannot be adjusted well due to linear heat exchanger temperature does not heating operation, however, the expansion valve fault.
  • 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 How long is “Please Wait” or more or less •...
  • 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 which is used to connect the indoor unit and the outdoor unit.
  • 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 which is used to connect the indoor unit and the outdoor unit. 198 to 264 VAC? Check the status of the indoor controller...
  • Page 44 LED display of the indoor controller board Symptoms: Nothing is displayed on the remote controller. 3 LED1: LED2: LED3: — Inspection method and Diagnosis flow Cause troubleshooting Check the voltage of the terminal block (TB6) of the remote controller. 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 1 Check if power is supplied to air conditioner. not operate remote controller does not 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 suf- 1 Check the set temperature of remote controller. ficiently. 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 3 This is not a malfunction. However, this control is is wrong HEAT operation is stopped. The blower is operating just for cooling down the also applied to the models 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 out- Cooling;...
  • Page 49 10-5. HOW TO CHECK THE PARTS Parts name Checkpoints Thermistor (TH3) Disconnect the connector then measure the resistance with a tester. <Liquid> (At the ambient temperature 10 to 30°C) Thermistor (TH4) Normal Abnormal <Discharge> TH4, TH33 160 to 410 k" Thermistor (TH6) <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> (TH3) • Thermistor <2-phase pipe> (TH6) • Thermistor <Ambient> (TH7) Thermistor R0 = 15 kΩ ± 3% B constant = 3480 ± 2% =15exp{3480( – 273+t 0°C 15 kΩ...
  • Page 52 Linear expansion valve (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 circuit board. • Valve position can be changed in proportion to the number of pulse signal. <Connection between the outdoor controller circuit board and the linear expansion valve>...
  • Page 53 (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 diagrams below. Main body Coil Lead wire Stopper <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 54 10-7. EMERGENCY OPERATION (1) When the check codes shown below are displayed on outdoor unit or microprocessor for wired remote controller or indoor unit has a failure, but no other problems are found, emergency operation will be available by setting the emergency opera- tion switch (SWE) on indoor controller board to ON and short-circuiting the connector (CN31) on outdoor switch board.
  • Page 55 (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 Operation data Remarks COOL HEAT Intake temperature (TH1) 27°C 20.5°C Indoor liquid pipe temperature (TH2)
  • Page 56 Brief Check of POWER MODULE 10-8. TEST POINT DIAGRAM If they are short-circuited, it means that they are broken. Outdoor controller circuit board Measure the resistance in the following points (connectors, etc.). 1. Check of Diode (DB1, DB2) Note: PUZ-ZM35/50 checks solder side. P - R , P - S , N - R , N - S 2.
  • Page 57 Switch board Demand control setting Pump down Model select Test operation Function switch Connect to A control service tool Manual defrost, detect history record reset, refrigerant address Outdoor M-NET board (optional) Switch for communication LED11 LED13 LED12 display between Outdoor unit Receiving CN2M Transmitting...
  • Page 58 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 Switch Function Effective timing switch When compressor is working Manual defrost Start Normal in heating operation. Abnormal history clear Clear Normal...
  • Page 59 Action by the switch operation Type of Switch No. Function Effective timing Switch No function — — — Power failure Auto recovery No auto recovery When power supply ON automatic recovery 3,4,5,6 No function — — — Mode select Demand function Low noise mode Always No function...
  • Page 60 (2) Function of connector Action by open/ short operation Types Connector Function Effective timing Short Open Connector CN31 Start When power supply ON Emergency operation Normal (3) Special function (a) Low-level sound priority mode (Local wiring) By performing the following modification, operation noise of the outdoor unit can be reduced by about 3-4 dB. The low noise mode will be activated when a commercially available timer or the contact input of an ON/OFF switch is added to the CNDM connector (option) on the control board of the outdoor unit.
  • Page 61 <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 connector CNM on outdoor switch board.
  • Page 62 Indication Error Outdoor controller Detailed Check circuit board Contents Inspection method reference code page LED1 (Green) LED2 (Red) 3 blinking 1 blinking Abnormality of shell thermistor(TH33) 1Check if stop valves are open. P. 29 and discharging temperature (TH4) 2Check if connectors (TH4, TH33, LEV-A, and LEV-B) on outdoor controller circuit board are not Abnormality of superheat due disconnected.
  • Page 63 <Outdoor unit operation monitor function> [When optional part ‘A-Control Service Tool (PAC-SK52ST)’ is connected to outdoor switch 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 64 The black square ( ) indicates a switch position. Display detail Explanation for display Unit SW2 setting Pipe temperature/Liquid (TH3) −60 to 91 −60 to 91 (When the coil thermistor detects 0°C or below, “−” and temperature are displayed by turns.) °C (Example) When −10°C;...
  • Page 65 The black square ( ) indicates a switch position. Display detail Explanation for display Unit SW2 setting Pipe temperature/Liquid (TH3) on error −60 to 91 occurring (When the coil thermistor detects 0°C or below, “–” −60 to 91 and temperature are displayed by turns.) °C (Example) When −15°C;...
  • Page 66 The black square ( ) indicates a switch position. Display detail Explanation for display SW2 setting Unit 0 to 4 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.
  • Page 67 The black square ( ) indicates a switch position. Display detail Explanation for display Unit SW2 setting Indoor setting temperature 17 to 30 17 to 30 °C 2 3 4 5 6 Outdoor pipe temperature/2-phase −60 to 91 (TH6) (When the temperature is 0°C or less, “–” and °C −60 to 91 temperature are displayed by turns.)
  • Page 68 The black square ( ) indicates a switch position. Display detail Explanation for display Unit SW2 setting DC bus voltage 150 to 400 150 to 400 (When it is 100V or more, hundreds digit, tens digit and ones digit are displayed by turns.) 2 3 4 5 6 Capacity save 0 to 100...
  • Page 69 The black square ( ) indicates a switch position. Display detail Explanation for display Unit SW2 setting 0 to 480 LEV-C opening pulse 0 to 480 (When it is 100 pulse or more, hundreds digit, tens digit and ones digit are displayed by turns.) (Example) When 130 pulse;...
  • Page 70 The black square ( ) indicates a switch position. SW2 setting Display detail Explanation for display Unit 0 to 255 Discharge superheat on error occurring (When the temperature is 100°C or more, hundreds digit, tens digit and ones digit are displayed by 0 to 255 turns.) °C...
  • Page 71 The black square ( ) indicates a switch position. Display detail Explanation for display Unit SW2 setting The following code will be a help to know the Controlling status of compressor operating status of unit. operating frequency • The tens digit Display Compressor operating frequency control Primary current control Secondary current control...

  • Page 72: Function Setting

    FUNCTION SETTING 11-1. UNIT FUNCTION SETTING BY THE REMOTE CONTROLLER Each function can be 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. <Table 1>...

  • Page 73: Monitoring The Operation Data By The Remote Controller

    MONITORING THE OPERATION DATA BY THE REMOTE CONTROLLER 12-1. HOW TO "MONITOR THE OPERATION DATA" Refer to "15-10. REQUEST CODE" when monitoring the operation data. 12-2. 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 74 Description Request content Unit Remarks (Display range) Indoor unit-Control state – Refer to "12-2-1. Detail Contents in Request Code". Outdoor unit-Control state – Refer to "12-2-1. Detail Contents in Request Code". Compressor-Frequency control state Refer to "12-2-1. Detail Contents in Request Code". –...
  • Page 75 Description Request content Unit Remarks (Display range) Error history 1 (latest) Displays error history. (" - - " is displayed if no history is present.) Code Error history 2 (second to last) Displays error history. (" - - " is displayed if no history is present.) Code Error history 3 (third to last) Displays error history.
  • Page 76 Description Request content Unit Remarks (Display range) Indoor-Fan operating time 0 to 9999 1 hour (After filter is reset) Indoor-Total operating time 10 hours 0 to 9999 (Fan motor ON time) Indoor fan output value (Sj value) 0 to 255 Fan control data –...
  • Page 77 12-2-1. Detail Contents in Request Code [Operation state] (Request code:" 0") Relay output state Power currently Data display Display Compressor Four-way valve Solenoid valve supplied to compressor – – – – Relay output state Operation mode Operation mode Display Operation mode STOP •...
  • Page 78 [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 79 [Contact demand capacity] (Request code: " 61") Setting content Data display Display Setting value Setting content 100% [External input state] (Request code: "62") Input state : Input present Data display Contact demand Silent mode Spare 1 Spare 2 Display Input state input input input...
  • Page 80 [Indoor unit – Capacity setting information] (Request code: "163") Data display Display Capacity setting state Display Capacity setting state See the table on the right. 35, 36 [Wireless pair No. (indoor control board side) setting] (Request code: " 165") Data display Display Pair No.

  • Page 81: Easy Maintenance Function

    EASY MAINTENANCE FUNCTION 13-1. SMOOTH MAINTENANCE Refer to "15-9. SMOOTH MAINTENANCE" for operation procedure. <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"...

  • Page 82: Disassembly Procedure

    DISASSEMBLY PROCEDURE : Indicates the visible parts in the photos/figures. OPERATING PROCEDURE PHOTOS/FIGURES Top panel Top panel 1. Removing the top panel, service panel, front panel, back Photo 1 fixing screws fixing screw panel and grille Top panel (1) Remove the top panel fixing screws (4 × 10), one from the right and two from the left side, and detach the top panel.
  • Page 83 OPERATING PROCEDURE PHOTOS/FIGURES 3. Removing the electrical parts box (1) Remove the service panel. (See Photo 2) Electrical parts box Photo 5 fixing screw (2) Remove the top panel. (See Photo 1) (3) Remove the front panel. (See Photo 1) Controller circuit board (C.B) (4) Remove the back panel.
  • Page 84 OPERATING PROCEDURE PHOTOS/FIGURES 5. Removing the thermistor <Ambient> (TH7) Photo 7 Electrical parts box Thermistor <Outdoor> (1) Remove the service panel. (See Photo 2) (TH7) (2) Remove the top panel. (See Photo 1) (3) Disconnect the connector TH7 (red) on the controller circuit board in the electrical parts box.
  • Page 85 OPERATING PROCEDURE PHOTOS/FIGURES 8. Removing the 4-way valve Photo 10 (1) Remove the service panel. (See Photo 2) (2) Remove the top panel. (See Photo 1) (3) Remove the front panel. (See Photo 1) (4) Remove the back panel. (See Photo 1) 4-way valve (5) Remove the electrical parts box.
  • Page 86 OPERATING PROCEDURE PHOTOS/FIGURES 12. Removing the compressor (MC) Photo 12 (1) Remove the service panel. (See Photo 2) (2) Remove the top panel. (See Photo 1) (3) Remove the front panel. (See Photo 1) (4) Remove the back panel. (See Photo 1) (5) Remove the electrical parts box.

  • Page 87: Remote Controller

    REMOTE CONTROLLER 15-1. REMOTE CONTROLLER FUNCTIONS <PAR-41MAA> 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 88 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 89 Menu structure Main menu Press the button. Move the cursor to the desired item with the buttons, and press the button. Operation Vane · Louver · Vent. (Lossnay) High power Comfort Manual vane angle 3D i-See sensor Timer menu Timer ON/OFF timer Auto-OFF timer Weekly timer...
  • Page 90 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 91 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 92 Main Setting and display items Setting details menu Initial Basic Main/Sub When connecting 2 remote controllers, one of them needs to be designated as setting setting a sub controller. Clock Use to set the current time. Daylight Set the daylight saving time. saving time Administrator The administrator password is required to make the settings for the following...
  • Page 93 <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 94 <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 95 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, date and time of occur- Error information rence, model name, and serial number will appear. Error code The model name and serial number will appear only if the informa- Error unit...
  • Page 96 • 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: Cursor...
  • Page 97 15-3. SERVICE MENU Maintenance password is required 1. Select ˝Service˝ from the Main menu, and press the [ ] button. Main Main menu *At the main display, the menu button and select ˝Service˝ to make Service the maintenance setting. 2. When the Service menu is selected, a window will appear asking for the pass- Service menu word.
  • Page 98 15-4. TEST RUN 15-4-1. PAR-41MAA 1. Select ˝Service˝ from the Main menu, and press the [ ] button. Test run Input maintenance info. Settings Check Select ˝Test run˝ with the F1 or F2 button, and press the [ ] button. Others 2.
  • Page 99 15-4-2. PAR-SL97A-E Measure an impedance between the power supply terminal block on the outdoor unit and ground with a 500 V Megger and check that it is equal to or greater than 1.0 MΩ. TEST RUN 1. Turn on the main power to the unit. TEST RUN 2.
  • Page 100 15-5. FUNCTION SETTING 15-5-1. PAR-41MAA Settings menu 1. Select ˝Service˝ from the Main menu, and press the [ ] button. Function setting Select ˝Setting˝ from the Service menu, and press the [ ] button. Service menu: Select ˝Function setting˝, and press the [ ] button.
  • Page 101 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 102 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. 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 103 15-6. ERROR HISTORY 1. Select ˝Service˝ from the Main menu, and press the [ ] button. Test run Input maintenance info. Settings Check Others Select ˝Check˝ with the F1 or F2 button, and press the [ button. Select ˝Error history˝ with the F1 or F2 button, and press the [ ] button.
  • Page 104 5. Preliminary error history Preliminary error history Select "Preliminary error history" from the Error history menu, and press Error Unt# dd/mm/yy the [ ] button. 32 preliminary error history records will appear. Error history menu: Page Delete 4 records are shown per page, and the top record on the first page indi- cates the latest error record.
  • Page 105 15-7. SELF-DIAGNOSIS 15-7-1. PAR-41MAA 1. Select ˝Service˝ from the Main menu, and press the [ ] button. Diagnosis Self check Select ˝Check˝ from the Service menu, Remote controller check and press the [ ] button. Service menu: Select ˝Diagnosis˝ from the Check menu, Cursor and press the [ ] button.
  • Page 106 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 107 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, Diagnosis and press the [ ] button. Self check Remote controller check Select ˝Check˝ from the Service menu, and press the [ ] button.
  • Page 108 15-9. SMOOTH MAINTENANCE 1. Select ˝Service˝ from the Main menu, and press the [ ] button. Check menu Error history Diagnosis Smooth maintenance Request code Select ˝Check˝ with the F1 or F2 button, and press the [ ] button. Service menu: Cursor Select ˝Smooth maintenance˝...
  • Page 109 ■ 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 110 HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN CCopyright 2021 MITSUBISHI ELECTRIC CORPORATION Published: Sep. 2021 No. OCH751 Made in Japan Specifications are subject to change without notice.

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