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Mitsubishi Electric SLZ-KF18NA, Technical & Service Manual

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Mitsubishi Electric SLZ-KF18NA Technical & Service Manual Download Page 14

14

OCH669A

7

REFRIGERANT SYSTEM DIAGRAM

Pipe temperature 
thermistor/liquid 
(TH2)

Distributor
with strainer
#50

Condenser/evaporator 
temperature thermistor
(TH5)

Room temperature 
thermistor (TH1)

Refrigerant flow in cooling

Refrigerant flow in heating

Strainer
#50

Strainer 
#50

Heat exchanger

Refrigerant GAS pipe connection
(Flare)

Refrigerant LIQUID pipe connection
(Flare)

SLZ-KF09NA.TH

    

SLZ-KF12NA.TH

    

SLZ-KF15NA.TH

    

SLZ-KF18NA.TH

SLZ-KF09/12NA.TH SLZ-KF15/18NA.TH

Gas pipe

ij

ij

Liquid pipe

ij

ij

Unit: inch(mm)

Summary of Contents for SLZ-KF18NA

Page 1: ... AIRFLOW SYSTEM 30 11 DISASSEMBLY PROCEDURE 32 Indoor unit Model Name Service Ref SLZ KF09NA TH SLZ KF12NA TH SLZ KF15NA TH SLZ KF18NA TH INDOOR UNIT Model name indication SLZ KF09NA SLZ KF12NA SLZ KF15NA SLZ KF18NA WIRED REMOTE CONTROLLER Option PARTS CATALOG OCB669 SPLIT TYPE HEAT PUMP AIR CONDITIONERS WIRELESS REMOTE CONTROLLER Option No OCH669 REVISED EDITION A February 2019 OCH669 is void Rev...

Page 2: ...rigerant oil or malfunction of com pressor Do not use a charging cylinder If a charging cylinder is used the composition of refrigera nt will change and the efficiency will be lowered Flare tool Electronic refrigerant charging scale Vacuum pump adaptor Size adjustment gauge Gauge manifold Torque wrench Gas leak detector Charge hose Tools for R410A Contamination inside refrigerant piping can cause ...

Page 3: ...s charged in liquid phase Electronic weighing scale Unit 3 Service tools Use the below service tools as exclusive tools for R410A refrigerant No Tool name Specifications 1 Gauge manifold Only for R410A Use the existing fitting specifications UNF1 2 Use high tension side pressure of 5 3MPa G or over 2 Charge hose Only for R410A Use pressure performance of 5 09MPa G or over 3 Electronic weighing sca...

Page 4: ...ing Vane Disperses airflow up and down and adjusts the angle of airflow direction Grille Filter Removes dust and pollutants from drawn in air Horizontal Air Outlet Sets horizontal airflow automatically during cooling or dehumidifying Air Intake Draws in air from room ...

Page 5: ... Step 5 Swing Auto Fan speed setting Set Temperature buttons Set Time button Sets the time LUÀRZ EXWWRQ KDQJHV XS GRZQ DLUÀRZ GLUHFWLRQ Mode button Changes operation mode Timer ON button Timer OFF button OFF ON button Fan Speed button Changes fan speed SET SEND button CANCEL button Up Down buttons Menu button i see button Reset button Remote controller display Battery replacement indicator Transmi...

Page 6: ...ion It blinks while the remote controller is starting up or when there is an error Press to save the setting Main display Press to change the operation mode Main menu Press to move the cursor down Press to return to the previous screen Main display Press to decrease temperature Main menu Press to move the cursor up Press to bring up the Main menu Main display Press to increase temperature Main men...

Page 7: ...r Restriction Maintenance Initial setting ON OFF timer Auto OFF timer Temp range Operation lock Manual vane angle Main Sub Timer Main display Contrast Display details Auto mode Administrator password Language selection Service Input maintenance info Function setting Check Self check Maintenance password Remote controller check Test run Clock Auto descending panel Menu structure Filter information ...

Page 8: ...aving rate Up to 4 energy saving operation patterns can be set for each day Time can be set in 5 minute increments Energy saving rate can be set to a value from 0 and 50 to 90 in 10 increments Night setback Use to make Night setback settings Select Yes to enable the setting and No to disable the setting The temperature range and the start stop times can be set Restriction Temp range Use to restric...

Page 9: ...ain pump test run Input maintenance Select Input maintenance Info from the Service menu to bring up the Maintenance information screen The following settings can be made from the Maintenance Information screen Model name input Serial No input Dealer information input Function setting Make the settings for the indoor unit functions via the remote controller as necessary LOSSNAY setting CITY MULTI o...

Page 10: ...0 40 30 20 10 63 125 250 500 1000 2000 4000 8000 APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE NC 60 NC 50 NC 40 NC 30 NC 20 NC 70 OCTAVE BAND SOUND PRESSURE LEVEL dB 0 dB 0 0002 μbar BAND CENTER FREQUENCIES Hz High Medium 34 SPL dB 30 LINE 60Hz NOTCH Low 25 SLZ KF12NA TH 90 80 70 60 50 40 30 20 10 63 125 250 500 1000 2000 4000 8000 APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE NC ...

Page 11: ...11 OCH669A OUTLINES AND DIMENSIONS 5 Unit inch mm SLZ KF09NA TH SLZ KF12NA TH SLZ KF15NA TH SLZ KF18NA TH ...

Page 12: ...12 OCH669A WIRED REMOTE CONTROLLER WIRELESS REMOTE CONTROLLER PAR SL100A E PAR 33MAA 7 7 16 188 2 9 16 64 7 2 5 8 66 7 8 22 3 4 19 4 3 4 120 4 3 4 120 3 5 16 83 5 1 13 16 46 Unit inch mm ...

Page 13: ...DWH VHOI GLDJQRVLV UHIHU WR WKH WHFKQLFDO PDQXDOV HWF LEGEND SYMBOL NAME I B DP FS MF MV TB4 7 7 TH1 TH2 TH5 OPTION PART INDOOR CONTROLLER BOARD CONNECTOR LOSSNAY CONNECTOR BACK UP HEATING CONNECTOR REMOTE SWITCH CONNECTOR HA TERMINAL A CONNECTOR CENTRALLY CONTROL CONNECTOR FUSE UL 6 3A 250V AC JUMPER WIRE PAIR NUMBER SETTING WITH WIRELESS REMOTE CONTROLLER POWER SUPPLY I B POWER SUPPLY WIRED REMO...

Page 14: ...istor TH5 Room temperature thermistor TH1 Refrigerant flow in cooling Refrigerant flow in heating Strainer 50 Strainer 50 Heat exchanger Refrigerant GAS pipe connection Flare Refrigerant LIQUID pipe connection Flare SLZ KF09NA TH SLZ KF12NA TH SLZ KF15NA TH SLZ KF18NA TH SLZ KF09 12NA TH SLZ KF15 18NA TH Gas pipe ij ij Liquid pipe ij ij Unit inch mm ...

Page 15: ...de logs and restart the unit after finishing service 3 There is no abnormality in electrical component controller board remote controller etc 1 Re check the abnormal symptom 2 Conduct troubleshooting and ascertain the cause of the trouble according to 8 4 TROUBLESHOOTING OF PROBLEMS 3 Continue to operate unit for the time being if the cause is not ascertained 4 There is no abnormality concerning o...

Page 16: ... and indoor unit 10 11 PB Pb Indoor unit fan motor error 12 FB Fb Indoor unit control system error memory error etc 14 PL Refrigerant circuit abnormal Output pattern B Errors detected by unit other than indoor unit outdoor unit etc Note The supported check codes may vary depending on the connected outdoor unit Wireless remote controller Wired remote controller Symptom Remark Beeper sounds OPERATIO...

Page 17: ...unit s protection device is not connected Reverse or open phase wiring for the outdoor unit s power terminal block Incorrect wiring between indoor and outdoor units incorrect polarity of S1 S2 S3 Remote controller wire short Note Operation is not possible for about 30 seconds after cancellation of function selection Correct operation For description of each LED LED1 2 3 provided on the indoor cont...

Page 18: ... Check resistance value of thermistor For characteristics refer to P1 above 2 Check contact failure of connector CN44 on the indoor controller board Refer to 8 5 TEST POINT DIAGRAM Turn the power on and check restart after inserting connector again Check pipe liquid temperature with remote controller in test run mode If pipe liquid temperature is extremely low in cooling mode or high in heating mo...

Page 19: ...or fan motor Check operating condition of refrigerant circuit Heating mode 1 Check cleanliness of the filter Remove blockage 4 Refer to 8 7 2 DC Fan Motor Fan Motor Indoor Controller Board Check outdoor fan motor Check operating condition of refrigerant circuit Pipe temperature Cooling mode Detected as abnormal when the pipe tem perature is not in the cooling range 3 min utes after compressor star...

Page 20: ...ooseness of indoor unit or transmission wire of remote controller 2 Set one of the remote controllers main if there is no problem with the action above 3 Check wiring of remote controller Total wiring length max 500 m Do not use cable of 3 wire or more The number of connecting indoor units max 16 units The number of connecting remote controller max 2 units If the cause of trouble is not in above 1...

Page 21: ...ormal if data cannot be normally read from the nonvolatile memory of the indoor controller board 1 Defective indoor controller board 1 Replace indoor controller board E1 or E2 6201 or 6202 Remote controller control board 1 Abnormal if data cannot be normally read from the nonvolatile memory of the remote controller control board Check code E1 2 Abnormal if the clock function of remote controller c...

Page 22: ...sation on float switch Drain water trickles down lead wire Drain water ripples due to filter being clogged Extension piping connection difference at twin triple or quadruple system Miswiring of indoor outdoor connecting at twin triple quadruple system Room temperature thermistor liquid pipe temperature thermistor detection is defective 1 Check the drain pump 2 Check whether water can be drained Ch...

Page 23: ...it Set the refrigerant address to 0 For grouping control system under which 2 or more outdoor units are connected set one of the units to 0 Set refrigerant address using SW1 3 6 on outdoor controller circuit board 1 2 LED2 on indoor controller board is blinking When LED1 on indoor controller board is also blinking Connection failure of indoor outdoor unit connecting wire When LED1 is lit 1 Miswiri...

Page 24: ...WRS 9 1 RSHUDWLRQ Same as 6 4 í RI 10 CNMF Fan motor MF 310 9 9 CN5Y i see Sensor motor MT 9 SXOVH RXWSXW 19 9DQH PRWRU 09 9 SXOVH RXWSXW J41 J42 Jumper wire Pair No setting with wireless remote controller SW2 Capacity setting LED3 Communication Indoor outdoor SWE Jumper switch Emergency operation CN32 Remote switch CN41 HA terminal A CN2L Lossnay CN01 Connect to the terminal block TB4 Indoor outd...

Page 25: ...N MODELS SW2 1 2 3 4 5 OFF ON 1 2 3 4 5 OFF ON KF09 KF12 KF15 1 2 3 4 5 OFF ON KF18 MODELS SW2 Pair number setting with IR wireless remote controller J41 J42 0 1 2 3 to 9 Wireless remote controller setting Control PCB setting J41 J42 Initial setting IR wireless remote controller 0 Control PCB for both J41 and J42 4 pair number settings are supported The pair number settings of the wireless remote ...

Page 26: ... works properly 2 Check if the drain pump works and drains water properly in dry mode 3 If no water drains confirm that the check code P5 will be displayed 10 minutes after the operation starts Note The DC volt drain pump motor for this model is driven by the control board so it is not possible to measure resistance between the wires leading to the pump motor Normal Red ODFN QSXW 9 ĺ The pump star...

Page 27: ...r Replace the indoor controller board Replace the defective fan motor Is the voltage normal Is there contact failure No Yes Yes No Check the operation of fan Complete Complete Fail OK OK Check the operation Check method of DC fan motor fan motor indoor controller circuit board 8 7 1 Thermistor Characteristic Graph ƒ6 PSWRP 7KH IDQ PRWRU GRHV QRW VWRS ZKHQ FRQWUROOHG WR VWRS E WKH UHPRWH controller...

Page 28: ...You can set these functions by wired remote controller Request code Note that the change can be made only by the wired remote controller PAR 33MAA Notes 1 If using a twin indoor unit system both main and sub unit should be set in the same setting 2 Every time replacing indoor controller board for serving the function should be set again 3 Stop the air conditioner operation before changing the heat...

Page 29: ...e 004 3 Enter the current maintenance password 4 numerical digits Move cursor to the digit you want to change with the F1 or F2 button Set each number 0 through 9 with the F3 or F4 button Note The initial maintenance password is 9999 4 Then press the button 5 Select Check with the F1 or F2 button and press the button 6 Select Request code with the F1 or F2 button and press the button 7 Set the Ref...

Page 30: ...ires Use a relay of 1W or smaller MB Electromagnetic switch power relay for duct fan X LOLDU UHOD 9 Be sure to secure insulation material by tape etc 5 Green Yellow í Orange Connector 5P Indoor unit side Multiple remote controller adapter PAC SA88HA E Be sure to secure insulation material by tape etc Installation at site CN51 on indoor unit board Red Brown 1 MB Multiple remote controller adapter P...

Page 31: ...RWRU RUL RQWDO YDQH Connector Unlocking button 9DQH PRWRU 3 Set the vertical vane of the air outlet by hand slowly within the range in the table below A Measured standard position of the grille Horizontal vane Caution Do not set the dimension out of the range Erroneous setting could cause dew drips or malfunction of unit θ Set range Standard of horizontal position QJOH ș RUL RQWDO QJOH ș QJOH ș QJ...

Page 32: ...nel See Figure 2 and Photo 2 5 Loosen the screw from the corner of the corner panel 6 Slide the corner panel as indicated by the arrow 7 Remove the safety strap from the hook then remove the corner panel from the panel The safety strap is not equipped for the signal receiver panel and i see Sensor corner panel 8 Remove the fastener then remove the corner panel Panel See Photo 3 9 Remove the 4 scre...

Page 33: ...r CN20 from the indoor controller board and disconnect the room temperature thermistor TH1 Note When fixing the thermistor make sure to fix it to the connector box using a band Photo 6 5 Removing the drain pan 1 Remove the panel Refer to procedure 2 2 Remove the room temperature thermistor TH1 Refer to procedure 4 Connector box See Photo 7 3 Remove the connector box fixing screw 4 Slide the connec...

Page 34: ...ve the nut and washer from the turbo fan 5 Remove the turbo fan from the motor shaft Nut and washer Note 1 When assembling the turbo fan attach it so that it s tabs fit the holes of washer Note 2 Nut tightening torque 4 5 0 5 Nm Fan motor See Photo 9 6 Remove the control box cover Refer to procedure 3 7 Disconnect the fan motor cable from the CNMF on the indoor controller board 8 Remove the 2 moto...

Page 35: ...es 1 When re attaching the drain pump make sure to use a band to fix the connector to the base plate 2 Do not give a shock to the float switch Otherwise it can cause damage or malfunction Photo 11 Photo 12 9 Removing the heat exchanger 1 Remove the panel Refer to procedure 2 2 Remove the room temperature thermistor TH1 Refer to procedure 4 3 Remove the drain pan Refer to procedure 5 4 Remove the t...

Page 36: ...ILDING 2 7 3 MARUNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN Copyright 2018 MITSUBISHI ELECTRIC CORPORATION VVXHG HE 1R 2 5 9 6 7 21 Published Sep 2018 No OCH669 Made in Japan Specifications are subject to change without notice ...

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