Mitsubishi Electric Mr.SLIM PUZ-A42NHA5-BS Service Manual

Split-type, heat pump air conditioners

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Technical data manual (104 pages)

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Summary of Contents for Mitsubishi Electric Mr.SLIM PUZ-A42NHA5-BS

Page 1: Table Of Contents
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS SPLIT-TYPE, AIR CONDITIONERS April 2012 No.OCH512 Outdoor unit SERVICE MANUAL R410A [Model names] [Service Ref.] PUZ-A42NHA5 Note: PUZ-A42NHA5 • This manual describes only service data of the PUZ-A42NHA5-BS PUZ-A42NHA5-BS outdoor units. • RoHS compliant products have <G>...
Page 2: Reference Manual
REFERENCE MANUAL INDOOR UNIT Model name Service Ref. Service manual No. PLA-A42BA4 PLA-A42BA4 OCH482 OCB482 PCA-A42KA5 PCA-A42KA5.TH OCH501 OCB501 PEAD-A42AA4 PEAD-A42AA4 HWE0905A 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 case of using the existing pipes for R22, be careful with Vacuum pump oil may flow back into refrigerant cycle and the followings.
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 times higher than that of R22, their sizes of flared sections and flare nuts are different.
Page 6: Features
FEATURES PUZ-A42NHA5 PUZ-A42NHA5-BS PUY-A42NHA5 PUY-A42NHA5-BS CHARGELESS SYSTEM PRE-CHARGED REFRIGERANT IS SUPPLIED FOR PIPING LENGTH AT SHIPMENT. (Max. 100ft, 30m) The refrigerant circuit with LEV (Linear Expansion Valve) and accumulator always control the optimal refrigerant level regardless of the length (100ft, 30m max. and 16ft, 5m min.) of piping. The additional refrigerant charging work during installation often causes problems.
Page 7: Specifications
SPECIFICATIONS Service Ref. PUZ-A42NHA5 PUY-A42NHA5 PUY-A42NHA5-BS PUZ-A42NHA5-BS Power supply Phase Single Cycle 60Hz Voltage 208/230V 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 ANB33FCTMT Motor output R.L.A.
Page 8: Data
DATA 5-1. REFILLING REFRIGERANT CHARGE (R410A : oz, kg) Piping Length ( one way ) Factory Service Ref. 50ft 60ft 70ft 80ft 90ft 100ft 110ft 120ft 130ft 140ft 150ft 160ft 165ft Charged 132 oz 136 oz 142 oz 148 oz 154 oz 160 oz 166 oz...
Page 9: Standard Operation Data
5-3. STANDARD OPERATION DATA 5-3-1. Heat pump Representative matching PLA-A42BA4 Mode COOLING HEATING 42 , 000 45 , 000 Total Capacity BTU/h 4 , 600 Input 4,450 Indoor unit model PLA-A42BA4 Phase Single Cycle 60Hz Voltage 230V Current 1.00A 0.94A Outdoor unit model PUZ-A42NHA5 Phase...
Page 10: Cooling Only
5-3-2. Cooling only Representative matching PLA-A42BA4 Mode COOLING 42 , 000 Total Capacity BTU/h 4 , 600 Input Indoor unit model PLA-A42BA4 Phase Single Cycle 60Hz Voltage 230V Current 1.00A Outdoor unit model PUY-A42NHA5 Phase Single Cycle 60Hz Voltage 230V Current 20.4A Discharge pressure...
Page 11: Outlines And Dimensions
OUTLINES AND DIMENSIONS PUZ-A42NHA5 PUZ-A42NHA5-BS Unit: mm<inch> PUY-A42NHA5 PUY-A42NHA5-BS OCH512...
Page 12: Wiring Diagram
WIRING DIAGRAM PUZ-A42NHA5 PUZ-A42NHA5-BS PUY-A42NHA5 PUY-A42NHA5-BS [LEGEND] SYMBOL NAME SYMBOL NAME SYMBOL NAME Terminal Block<Power Supply, Indoor/Outdoor > TABS/T Connection Terminal<L1/L2-Phase> Switch<Function Setup> Motor for Compressor TABP1/P2/P Connection Terminal<DC Voltage> Switch<Function Setup> MF1,MF2 Fan Motor TABN1/N2/N Connection Terminal<DC Voltage> Switch 21S4 Solenoid Valve (Four-Way Valve) DS2, DS3...
Page 13: Wiring Specifications
WIRING SPECIFICATIONS 8-1. INDOOR UNIT POWER SUPPLIED FROM OUTDOOR UNIT (A-control application) The following connection patterns are available. The outdoor unit power supply patterns vary on models. 1:1 System Simultaneous twin system Outdoor unit power supply Wiring circuit breaker or isolating switch Outdoor unit Indoor unit/outdoor unit connecting cords Remote controller...
Page 14: Separate Indoor Unit/Outdoor Unit Power Supplies
8-2. SEPARATE INDOOR UNIT/OUTDOOR UNIT POWER SUPPLIES The following connection patterns are available. 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 15 8-3. INDOOR - OUTDOOR CONNECTING CABLE Wire No. Size Outdoor power supply Max. 45m, 147ft Max. 50m, 164ft Max. 80m, 262ft Indoor unit-Outdoor unit AWG16(polar) AWG13(polar) AWG13(polar) and S3 separated The max. cable length may vary depending on the condition of installation, humidity or materials, etc. Wire No.
Page 16: M-Net Wiring Method
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 17 ● M-NET wiring M-NET (1) Use 2-core × 1.25mm² [AWG16] shield wire for electric wires. terminal Ground (Excluding the case connecting to system controller.) 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.
Page 18: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM PUZ-A42NHA5 Unit: mm (inch) PUZ-A42NHA5-BS Service port (check) High pressure protect switch 4-way Ball valve valve Outdoor heat exchanger (#50) Thermistor Strainer (TH6) Refrigerant GAS pipe 15.88 ( 5/8) Thermistor (TH3) Service port Muffler (check) Strainer Thermistor (#100) Distributor (TH32)
Page 19 1. Refrigerant collecting (pump down) Perform the following procedures to collect the refrigerant when moving the indoor unit or the outdoor unit. 1 Supply power (circuit breaker). * When power is supplied, make sure that “CENTRALLY CONTROLLED” is not displayed on the remote controller. If “CENTRALLY CONTROLLED”...
Page 20: Troubleshooting
TROUBLESHOOTING 10-1. TROUBLESHOOTING <Error code display by self-diagnosis and actions to be taken for service (summary)> Present and past error codes are logged and displayed on the wired remote controller and control board of outdoor unit. Actions to be taken for service, which depends on whether or not the trouble is reoccurring at service, are summarized in the table below.
Page 21 Operating procedures While the room temperature display on the remote "TEST RUN" and the currently selected controller is “PLEASE WAIT”, the remote controller is disabled. operation mode are displayed alternately. Wait until “PLEASE WAIT” disappears before using remote controller. 1. Turn on the main power supply. “PLEASE WAIT”...
Page 22 Test run [for IR wireless remote controller] 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 COOL 1 Turn on the main power to the unit. TEST RUN 2 Press the button twice continuously.
Page 23: How To Proceed "Self-Diagnosis
10-3. HOW TO PROCEED "SELF-DIAGNOSIS" 10-3-1. When a Problem Occurs During Operation If a problem occurs in the air conditioner, the indoor and outdoor units will stop, and the problem is shown in the remote controller display. [CHECK] and the refrigerant address are displayed on the temperature display, and the error code and unit number are displayed alternately as shown below.
Page 24: Remote Controller Diagnosis
When the error history is reset, the display will look like the one shown below. Press the button twice within 3 seconds. ON/OFF However, if you fail to reset the error history, the error content will be displayed again. The self-diagnosis address or refrigerant address will blink. Cancel self-diagnosis.
Page 25 10-3-4. Malfunction-diagnosis method by IR 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 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 sec. 0.5 sec. 0.5 sec. 0.5 sec.
Page 27: Self-Diagnosis Action Table
10-4. SELF-DIAGNOSIS ACTION TABLE <Abnormalities detected when the power is turned on> (Note 1) Refer to indoor unit section for code P and code E. Abnormal point and detection method Judgment and action Error Code Case 1 No voltage is supplied to termi- 1 Check following items.
Page 28 Case Error Code Abnormal point and detection method Judgment and action 1 Contact failure or miswiring of 1 Check disconnection or looseness or polarity Indoor/outdoor unit connector indoor/outdoor unit connecting of indoor/outdoor unit connecting wire of miswiring, excessive number of units wire indoor and outdoor units.
Page 29 <Abnormalities detected while unit is operating> Abnormal point and detection method Judgment and action Error Code Case 1 Short cycle of indoor unit 1~6 Check indoor unit and repair the defect. High pressure (High-pressure switch 2 Clogged filter of indoor unit 63H operated) 3 Decreased airflow caused by Abnormal if high-pressure switch 63H oper-...
Page 30 Abnormal point and detection method Case Judgment and action Error Code Open/short of outdoor unit thermistors 1 Disconnection or contact failure 1 Check connection of connector (TH3,TH6/TH7) (TH3, TH6, TH7, and TH8) of connectors on the outdoor controller circuit board. Abnormal if open or short is detected Outdoor controller circuit Check connection of connector (CN3) on the...
Page 31 Abnormal point and detection method Judgment and action Error Code Case 1 Failure in the operation of the 1 Check or replace the DC fan motor. Outdoor fan motor Abnormal if the rotational frequency of fan DC fan motor 2 Failure in the outdoor circuit 2 Check the voltage of the outdoor circuit motor is not detected during DC fan motor operation.
Page 32 Abnormal point and detection method Judgment and action Error Code Case 1 Stop valve of outdoor unit is 1 Open stop valve. Compressor overcurrent interruption 2 Check facility of power supply. Abnormal if overcurrent DC bus or com- closed. 2 Decrease of power supply volt- pressor is detected after compressor starts 3 Correct the wiring (U·V·W phase) to operating for 30 seconds.
Page 33 Abnormal point and detection method Judgment and action Error Code Case w Check LED display on outdoor controller Indoor/outdoor unit communication circuit board. (Connect A-Control service tool error (Signal receiving error) 1 Abnormal if indoor controller board could (PAC-SG50ST)) 1 Contact failure, short circuit or not receive any signal normally for 6 Refer to EA~EC item if LED displays EA~AC.
Page 34 Abnormal point and detection method Judgment and action Error Code Case 1 Slight temperature difference Pipe temperature Check pipe <liquid or condenser/ <Cooling mode> between indoor room evaporator> temperature with room Detected as abnormal when the pipe temperature and pipe <liquid temperature display on remote temperature is not in the cooling range or condenser/evaporator>...
Page 35 Error Code Abnormal point and detection method Case Judgment and action 1 Data of transmission proces- Communication error with communica- Turn off the power supply of outdoor unit and sor or unit processor is not indoor unit and FRESH MASTER or LOSSNAY tion processor transmitted normally because at the same time for 2 minutes or more, and...
Page 36 From the previous page. Error Code Abnormal point and detection method Case Judgment and action 1 During group operation with 4. If displayed address or attribute is Same as mentioned in “A7” of the previous indoor unit of multi- refrigerant remote controller, page.
Page 37: Troubleshooting By Inferior Phenomena
Error Code Abnormal point and detection method Case Judgment and action 1 Transmitting condition is 1 Check transmission waveform or noise on M-NET NO RESPONSE Abnormal if a message was transmitted repeated fault because of transmission wire. noise and the like. 2 Turn off the power supply of outdoor unit and there were reply (ACK) that message 2 Extension of transmission wire...
Page 38 Phenomena Factor Countermeasure 1The pair number settings of the IR wireless remote 4. Even controlling by the IR wireless 1Check 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 39 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 40: Symptoms: Nothing Is Displayed On The Remote Controller
LED display of the indoor controller board LED1 : Symptoms: Nothing is displayed on the remote controller 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. AC 187V to AC 253V? Check the voltage among L1 and L2 on the terminal block (TB1) of the...
Page 41 LED display of the indoor controller board LED1 : Symptoms: Nothing is displayed on the remote controller 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.
Page 42 LED display of the indoor controller board LED1 : Symptoms: Nothing is displayed on the remote controller LED2 : LED3 : — Inspection method and Diagnosis flow Cause troubleshooting Check the voltage of the terminal block (TB6) of the remote controller. DC 10V to DC 16V? •...
Page 43 • Before repair Frequent calling from customers Phone Calls From Customers How to Respond Note Unit does The operating display of remote 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 44 Phone Calls From Customers How to Respond Note The room cannot be cooled or heated sufficiently. 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 45 Phone Calls From Customers How to Respond Note Something Air blows out for a while after However, this control is also 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 46 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 gets started in the room of high humidity. Water or moisture is expelled from the outdoor Cooling: when pipes or piping joints are cooled, they unt.
Page 47 10-6. HOW TO CHECK THE PARTS PUZ-A42NHA5 PUZ-A42NHA5-BS PUY-A42NHA5 PUY-A42NHA5-BS Parts name Check points Thermistor (TH3) Disconnect the connector then measure the resistance with a tester. <Outdoor pipe> (At the ambient temperature 10 ~30 , 50°F~86°F) Thermistor (TH6) Normal Abnormal <Outdoor 2-phase pipe>...
Page 48 Check method of DC fan motor (fan motor/outdoor controller circuit board) Notes · High voltage is applied to the connecter (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. board and fan motor.) (It causes trouble of the outdoor controller circuit Self check...
Page 49 10-7. HOW TO CHECK THE COMPONENTS <Thermistor feature chart> Low temperature thermistors • Thermistor <Outdoor pipe> (TH3) • Thermistor <Outdoor 2-phase pipe> (TH6) • Thermistor <Outdoor> (TH7) Thermistor R0 = 15k" ± 3% B constant = 3480 ± 2% =15exp{3480( 273+t – 273 )} t (:): R =15exp{3480( 273+(T–...
Page 50: Linear Expansion Valve
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 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 51 (4) 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 52: Emergency Operation
10-8. EMERGENCY OPERATION (1) When the error 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) to ON and short-circuiting the connector (CN31) on outdoor controller board.
Page 53 (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:, 81°F 20.5:, 69°F Indoor ﬂ...
Page 54 10-9. TEST POINT DIAGRAM <CAUTION> TEST POINT1 is high voltage. Outdoor controller circuit board PUZ-A42NHA5 PUZ-A42NHA5-BS PUY-A42NHA5 PUY-A42NHA5-BS CN51 Forced defrost, detect history record reset, refrigerant address Demand control setting External signal output • Compressor operat- ing signal Model select •...
Page 55 Outdoor noise filter circuit board PUZ-A42NHA5 PUZ-A42NHA5-BS PUY-A42NHA5 PUY-A42NHA5-BS CN52C 52C driving signal (Connect to the outdoor controller circuit board (CN52C)) LO, NO Voltage of 208/230V AC is output (Connect to the outdoor power circuit board (TABS, TABT)) CNAC1, CNAC2 208/230V AC (Connect to the outdoor control-...
Page 56 Outdoor power circuit board Brief check of POWER MODULE W Usually, they are in a state of being short-circuited if they are broken. PUZ-A42NHA5 Measure the resistance in the following points (connectors, etc.). PUZ-A42NHA5-BS If they are short-circuited, it means that they are broken. 1.
Page 57 Active filter module PUZ-A42NHA5 PUZ-A42NHA5-BS PUY-A42NHA5 PUY-A42NHA5-BS Connect to the outdoor power circuit board (TABP2) L1, L2 Connect to the DCL (Reactor) Non-connect Lower side Upper side Non-connect Connect to the outdoor power circuit board (TABP1) Connect to the outdoor power circuit board (CNAF) –...
Page 58: Function Of Switches, Connectors And Jumpers
10-10. 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 operating Forced defrost 1 Start Normal in heating operation.
Page 59 Action by the switch operation Type of Switch Function Effective timing Switch No function — — — Power failure Auto recovery No auto recovery When power supply ON automatic recovery 2 No function — — — 3,4,5 Model select Following SW5-6 reference Power consumption SW7-1 SW7-2...
Page 60 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 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 controller board.
Page 62 Indication Error Outdoor controller board Error Detailed Contents Inspection method code reference LED1 (Green) LED2 (Red) page 3 blinking 1 blinking Check if stop valves are open. Abnormality of shell thermistor (TH32) P.29 Check if connectors (TH32, LEV-A) on outdoor controller board are not disconnected.
Page 63 <Outdoor unit operation monitor function> [When option 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 error code by controlling DIP SW2 on ‘A-Control Service Tool’. ■...
Page 64 ■ The black square ( ) indicates a switch position. SW2 setting Display detail Explanation for display Unit Pipe temperature / Liquid(TH3) – 40~194 (– 40~90:) – 40~194 (When the coil thermistor detects 0˚F or below, “–” and temperature are displayed by turns.) ˚F (Example) When -10˚F;...
Page 65 ■ The black square ( ) indicates a switch position. Explanation for display Unit SW2 setting Display detail Pipe temperature/Liquid (TH3) on error – 40~194 (– 40~90:) occurring (When the coil thermistor detects 0˚F or below, “–” – 40~194 and temperature are displayed by turns.) ˚F (Example) When –15˚F;...
Page 66 ■ The black square ( ) indicates a switch position. Explanation for display SW2 setting Display detail Unit The number of connected indoor units (The number of connected indoor units are displayed.) Unit 2 3 4 5 6 Capacity setting display Displayed as an outdoor capacity code Capacity Code...
Page 67 ■ The black square ( ) indicates a switch position. Explanation for display Unit SW2 setting Display detail Indoor setting temperature 62~86 (17~30:) 62~86 ˚F 2 3 4 5 6 Outdoor pipe temperature / 2-phase -38~190 (-39~88:) pipe (TH6) (When the temperature is 0˚F or less, “–” and -38~190 temperature are displayed by turns.) ˚F...
Page 68 ■ The black square ( ) indicates a switch position. Explanation for display Unit SW2 setting Display detail 0~100 Capacity save (When the capacity is 100%, hundreds digit, tens 0~100 digit and ones digit are displayed by turns.) When air conditioner is connected to (Example) When 100%;...
Page 69 ■ The black square ( ) indicates a switch position. Explanation for display Unit SW2 setting Display detail 0~480 LEV-A opening pulse on error occurring (When it is 100 pulse or more, hundreds digit, tens 0~480 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 32~360 (0~182˚C) Discharge superheat on error occurring (When the temperature is 100˚F or more, hundreds digit, tens digit and ones digit are 32~360 displayed by turns.) ˚F...
Page 71 ■ The black square ( ) indicates a switch position. SW2 setting Display detail Explanation for display Unit Controlling status of compressor The following code will be a help to know the operating frequency operating status of unit. • The tens digit Display Compressor operating frequency control Primary current control Secondary current control...
Page 72: Easy Maintenance Function
EASY MAINTENANCE FUNCTION Reduces maintenance work drastically. Enables you to check operation data of the indoor and outdoor units by remote controller. Furthermore, use of maintenance stable-operation control that fixes the operating frequency, allows smooth inspection, even for inverter models. Smooth Mainte- Discharge temperature 147 °F Conventional inspection work...
Page 73 Data measurement When the operation is stabilized, measure operation data as explained below. (4) Press the [TEMP] buttons ( ) to select the desired refrigerant address. [Screen (5) Select the type of data to be displayed. After selecting, go to step (6). Compressor information button MENU...
Page 74 11-2.GUIDE FOR OPERATION CONDITION Check Points Inspection item Result Breaker Good Retightened Enter the temperature differences between into Terminal block Outdoor Unit Good Retightened the graph given below. Indoor Unit Good Retightened Operation state is determined according to the plotted areas on (Insulation resistance) the graph.
Page 75: Function Setting
FUNCTION SETTING 12-1. 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. (1) Functions available when setting the unit number to 00 (Select 00 referring to 4 setting the indoor unit number.) <Table 1>...
Page 76 (2) Functions available when setting the unit number to 01-03 or AL (07 in case of 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 77 12-1-1. Selecting functions using the wired remote controller First, try to familiarize yourself with the flow of the function selection procedure. In this section, an example of setting the room temperature detection position is given. For actual operations, refer to steps Setting number Refrigerant address Unit number...
Page 78 [Operating Procedure] Check the setting items provided by function selection. If settings for a mode are changed by function selection, the functions of that mode will be changed accordingly. Check all the current settings according to steps , fill in the "Check" column in Table 1, then change them as necessary. For initial settings, refer to the indoor unit's installation manual. Switch off the remote controller.
Page 79 12-1-2. Selecting functions using the IR wireless remote controller (Type C) Functions can be selected with the IR wireless remote controller. Function selection using IR wireless remote controller is available only for refrigerant system with wireless function. Refrigerant address cannot be specified by the IR wireless remote controller. [Flow of function selection procedure] The flow of the function selection procedure is shown below.
Page 80 12-2. FUNCTION SELECTION OF REMOTE CONTROLLER The setting of the following remote controller functions can be changed using the remote controller function selection mode. Change the setting when needed. Item 1 Item 2 Item 3 (Setting content) 1.Change language Language setting to display •...
Page 81 [Function selection flowchart] Normal display Hold down the button and press the button for 2 seconds. (Display when the air conditioner is not running) Setting language (English) Press the operation mode button. Hold down the button and press the button for 2 seconds. Press theTIMER MENU button.
Page 82 12-3. Function selection of IR wireless remote controller TEMPERATURE DISPLAY °C/°F SETTING (Change of temp mode from °F to °C) 1 Press the set button with something sharp at the end. MODEL SELECT blinks. AUTO START 2 Press the button. “F:” blinks. 3 Press the button.
Page 83: Monitoring The Operation Data By The Remote Controller
MONITORING THE OPERATION DATA BY THE REMOTE CONTROLLER 13-1. HOW TO "MONITOR THE OPERATION DATA" • Turn on the [Monitoring the operation data] Example) Request code "004" Discharge temperature 156°F Refrigerant address "00" A: Mode display B: Refrigerant address C: Data display area D: Request code display area (1) Press the button for 3 seconds so that [Maintenance mode] appears on the screen (at...
Page 84 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 Remarks (Display range) Operation state Refer to 13-2-1. Detail Contents in Request Code. – Compressor-Operating current (rms) 0 –...
Page 85 Description Request content Unit Remarks (Display range) Indoor unit-Control state – Refer to 13-2-1.Detail Contents in Request Code. Outdoor unit-Control state – Refer to 13-2-1.Detail Contents in Request Code. Compressor-Frequency control state Refer to 13-2-1.Detail Contents in Request Code. – Outdoor unit-Fan control state Refer to 13-2-1.Detail Contents in Request Code.
Page 86 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 87 Description Request content Unit Remarks (Display range) Indoor-Fan operating time 0 – 9999 1 hour (After filter is reset) Indoor-Total operating time 0 – 9999 10 hours (Fan motor ON time) Indoor fan output value (Sj value) 0 – 255 Fan control data –...
Page 88 13-2-1. Detail Contents in Request Code Example) Request code "004" Discharge temperature 156°F Refrigerant address "00" A: Mode display B: Refrigerant address C: Data display area D: Request code display area [Operation state] (Request code : "0") Relay output state Power currently Data display Display...
Page 89 [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 Actuator output state...
Page 90 [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 present Data display Contact demand Silent mode Spare 1 Spare 2 Display Input state...
Page 91 [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...
Page 92 [Indoor unit – Model setting information] (Request code : 162) Data display Display Model setting state Display Model setting state See the table on the right. PLA-A·BA PCA-A·KA [Indoor unit – Capacity setting information] (Request code : 163) Data display Display Capacity setting state Display...
Page 93: Disassembly Procedure
DISASSEMBLY PROCEDURE PUZ-A42NHA5 PUZ-A42NHA5-BS PUY-A42NHA5 PUY-A42NHA5-BS OPERATING PROCEDURE PHOTOS & ILLUSTRATION 1. Removing the service panel and top panel Top panel fixing screws Top panel Figure 1 (1) Remove 3 service panel fixing screws (5 × 12) and slide the hook on the right downward to remove the service Service panel panel.
Page 94 OPERATING PROCEDURE PHOTOS 4. Removing the thermistor <Outdoor 2-phase pipe> (TH6) Photo 4 Thermistor (1) Remove the service panel. (See Figure 1) <Outdoor 2-phase pipe> Electrical (2) Remove the top panel. (See Figure 1) Controller (TH6) parts box circuit board (3) Disconnect the connectors, TH6 and TH7 (red), on the (C.B.) controller circuit board in the electrical parts box.
Page 95 OPERATING PROCEDURE PHOTOS 7. Removing the 4-way valve coil (21S4), and linear expansion valve coil (LEV-A) (1) Remove the service panel. (See Figure 1) (2) Remove the top panel. (See Figure 1) [Removing the 4-way valve coil] (3) Remove 4-way valve coil fixing screw (M4 × 6). (4) Remove the 4-way valve coil by sliding the coil toward you.
Page 96 OPERATING PROCEDURE PHOTOS 10. Removing the high pressure switch (63H) Photo 8 (1) Remove the service panel. (See Figure 1) (2) Remove the top panel. (See Figure 1) (3) Remove 3 right side panel fixing screws (5 × 12) in the rear of the unit and remove the right side panel.
Page 97 OPERATING PROCEDURE PHOTOS 12. Removing the compressor (MC) Photo 10 (1) Remove the service panel. (See Figure 1) (2) Remove the top panel. (See Figure 1) (3) Remove 2 front cover panel fixing screws (5 × 12) and remove the front cover panel. (See Photo 3) Valve bed (4) Remove 2 back cover panel fixing screws (5 ×...
Page 98 HEAD OFFICE : TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN CCopyright 2012 MITSUBISHI ELECTRIC CORPORATION New publication, effective Apr. 2012 Distributed in Apr. 2012 No.OCH512 Specifications are subject to change without notice. Made in Japan...

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Mitsubishi Electric Mr.SLIM PUZ-A42NHA5-BS Service Manual

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