Service Manual - Mitsubishi Electric Cooling & Heating
Contents
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3. mm lt in gt item Capacity PDFY P06 08 12 15NMU E PDFY P18NMU E R410A 12 7 1 2 Gas pipe R22 12 7 1 2 15 88 5 8 R410A 6 35 1 4 Liquid pipe R22 6 35 1 4 9 52 3 8 mm lt in gt PDFY P24 27 30NMU E PDFY P36 48NMU E R410A 15 88 5 8 Gas pipe R22 15 88 5 8 19 05 3 4 R410A 9 52 3 8 Liquid pipe R22 9 52 3 8 7 1 How to check the parts Parts name Check points Room temparature Disconnect the connector then measure the resistance using a tester thermistor TH21 Sorrounding temperature 10 C 30 C 50 F 86 FJ Liquid pipe thermistor TH22 Gas pipe thermistor Normal Abnormal T Refer to the th ist H23 4 3kQ 9 6kO Open or short ee Transformer Disconnect the connector and measure the resistance using a tester CNT T CN3T Red Blue CNT 1 3 CN3T 1 Normal Abnormal Nm Open or short 3 App 10 White Blue Linear expansion Disconnect the connector then measure the resistance valve using a tester valve cNeo Refer to the next page for a detail White Ee 3 Normal 1 5 2 6 3 5 4 6 White Red Yellow Blown Orange Red Blue Brown 1500 10 Open or short Measure the resistance between the terminals using a tester at 20 C 68 F Motor terminal or Abnormal Relay connector 10 16 24 32 Orange Gray 43 1Q 40 50 Brack Gray 53 60 48 80 E
4. Fan motor PDFY P06 30NMU E Relay connector Open or short Protector Relay connector Measure the resistance between the terminals using a tester at 20 C 68 F MEC mina era Relay connector 40 48 Open or short Yellow Red PDFY P36 48NMU E Protector 13 lt Thermistor Characteristic graph gt lt Thermistor for lower temperature gt Room temparature thermistor TH21 i Thermistor for laddi a i istor TH22 lower temperature Liquid pipe thermistor Gas pipe temparature thermistor TH23 Drain sensor DS 40 Thermistor Ro 15kQ 3 a Fixed number of B 3480kQ 2 z 30 Rt 15exp 3480 JA E 273 t 273 E OC 32 F 15kQ 10C 50F 9 6kQ 20C 68F 6 3kQ 25C 77F 52kQ 10 30C 86F 4 3kQ 40 C 104 F 3 0kQ 0 20 10 0 10 20 30 40 50 CC 4 14 32 50 68 86 104 122 F Temperature Linear expansion valve D Operation summary of the linear expansion valve e Linear expansion valve open close through stepping motor after receiving the pulse signal from the indoor controller board e Valve position can be changed in proportion to the number of pulse signal lt Connection between the indoor controller board and the linear expasion valve gt Controller board Linear expansion valve
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7. Changes for the Better MITSUBISHI ELECTRIC AIR CONDITIONERS CITY MULTI 200 b TECHNICAL amp SERVICE MANUAL Series PDFY Ceiling Concealed Built in PDF Y PO6NMU E PDFY PO8NMU E PDFY P12NMU E PDFY P15NMU E PDFY P18NMU E PDFY P24NMU E PDFY P27NMU E PDFY P30NMU E PDFY P36NMU E PDFY P48NMU E CONTENTS SAFETY PRECAUTIONS 1 FEATURES isaac 3 2 PART NAMES AND FUNCTIONS 4 3 SPECIFICATION 6 4 OUTLINES AND DIMENSIONS 8 5 WIRING DIAGRAM 10 6 REFRIGERANT SYSTEM DIAGRAM 12 7 TROUBLE SHOOTING 13 8 DISASSEMBLY PROCEDURE 18 CITY MULIH For use with the R410A amp R22 SAFETY PRECAUTIONS 1 Before installation and electric work gt Before installing the unit make sure you read all the Safety precautions The Safety precautions provide very important points regarding safety Make sure you follow them This equipment may not be applicable to EN61000 3 2 1995 and EN61000 3 3 1995 This equipment may have an adverse effect equip ment on the same electrical supply system gt Please report to or take consent by the supply au thority before connection to the system Symbols used in the text N Warning Describes precautions that should be observed to prevent danger of injury or death to the user N C
8. 3 Mode Button Airflow Up Down Button 2 ON OFF Button Return Button Ventilation Button 3 Position of built in room temperature 4 Timer On Off Button Operation Button Set Time Button Set Day Button Check Clear Button Never expose the remote controller to direct sunlight Doing so can result in the erroneous measure ment of room temperature e Never place any obstacle around the lower right hand section of the remote controller Doing so can result in the erroneous measurement of room temperature NE Display 0099000090000000 0 D NOO D Current time Timer Centralized control Timer OFF Timer indicator Operation mode COOL ODRY CIAUTO f FAN HEAT Locked indicator Set temperature Power ON Louver Ventilation Filter sign Set effective for 1 hr Sensor position Room temperature Airflow Fan speed DD D SPECIFICATION 3 1 Specification PDFY P NMU E Hem SSS Model PDFY PO6NMU E PDFY PO8NMU E PDFY P12NMU E PDFY P15NMU E PDFY P18NMU E 208 230V 60Hz dum Capacity E BTU h 6000 8000 12000 15000 18000 See _ BTU h 6700 9000 13500 17000 20000 mm 295 Ge ind 11 58 Lo mmm L mm 735 2519 10 ee Le 6 0 6 5 7 5 8 5 10 0 11 0 12 5 14 0 ET NT Low Middle2 Middle1 High NE 211 229 264 300 211 229 264 300 211 229 264 300 353 388 441 494 353 388 441 494 External static 208V 30 50 80 30 50 80 30 50 8
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11. 0 30 50 80 30 50 80 pressure 3 230V 40 60 100 40 60 100 40 60 100 40 60 100 40 60 100 Noise level 208V 26 28 31 34 26 28 31 34 26 28 31 34 32 34 35 37 32 34 35 37 Low Middle2 Middle1 High 230V 28 30 33 36 28 30 33 36 28 30 33 36 34 36 37 39 34 36 37 39 Standard filter PDFY P NMU E PDFY P24NMU E PDFY P27NMU E PDFY P30NMU E PDFY P36NMU E PDFY P48NMU E Power sourse 208 230V 60Hz E Capacity g BTU h 24000 27000 30000 36000 48000 4 PER g BTU h 27000 30000 34000 40000 54000 5 Jj 835 dildo im 11 5 8 13 7132 ne mm 1160 1510 Dimension Width 4511 16 59 15 32 m 75 7 ESCH EEE 30 17 32 i i Airflow rate Son Low Middle2 Middle1 High om 441 494 565 635 477547 618889 494 562 653741 688988 SA7 1200 External static pressures Pe av 0805 4000101 sesos erst sets Noise level Low Middle2 Middle1 High EE Notes 1 Cooling Heating capacity indicates the maximum value at operation under the following condition Cooling Indoor 26 7 C 80 F DB 19 4 C 67 F WB Outdoor 35 C 95 F DB Heating Indoor 21 1 C 70 F DB Outdoor 8 3 C 47 F DB 6 1 C 43 F WB 2 The operating noise is the data that was obtained in an anechoic room 3 As for the factory setting is below PDFY P NMU E series PDFY PO6NMU E PDFY PO8NMU E PDFY P12NMU E PDFY P15NMU E PDFY P18NMU E E 230V 208V 230V E 230V 208V 230V s a PDFY P24NMU E PDFY P27NMU E PDFY P30NMU E PDFY P36NMU E PDFY P48NM
12. 7NMU E PDFY P15NMU E Indoor controller board SW3 MODELS SW3 MODELS SW3 Indoor controller board PDF Y Set while the unit is off Function 1 10 bo6 08 12 18 24 27 SS s OFF Selection 30 48NMU E 123456789 10 123456789 10 SW4 P06 30 E Indoor controller board Unit 1 4 ud m hs Set while the unit is off i E lt At delivery gt Selection 123 4 123 4 5 Note The DipSW setting is effective during unit stopping remote controller OFF for SW1 2 3 and 4 commonly and the power source is not required to reset 16 Pole Operation by switch Remarks 0 200 0 240 0 321 0 401 10 200 0 321 0 240 0 401 0 200 0 401 0 240 0 461 in WG in WG in WG in WG fin WG in WG in WG 80Pa 60Pa in WG in WG 100Pa 50Pa in WG in WG 100Pa 60Pa in WG 50Pa 115Pa Address board lt At delivery gt 3 2 1 setting SW12 2nd degit address setting Note 2 SW14 Connect ion No setting Note 2 Note Rotary switch Rotary switch 0 120 in WG 30Pa 0 200 in WG 50Pa 0 321 in WG 80Pa Option Standard 0 120 in WG 30Pa 0 200 in WG 50Pa Option Standard Option 0 321 in WG Standard 80 Pa SW12 SWI ALN APN AN wi fo AN v9 0 160 in WG 40Pa 0 240 in WG 60Pa 0 461 in WG 115Pa 0 160 in WG 40Pa 0 240 in WG 60Pa 0 120 in WG 30Pa 0 200 in WG 50Pa 0 160 in WG 40Pa 0 240 in WG 60Pa 0 401 in
13. U E 208V 230V 208V 230V 208V 230V 208V 230V 208V 230V 5 60 50 6 5 60 5 6 50 60 3 2 Electrical parts specifications PDFY PDFY PDFY Parts P06 08 12 P30 P36 atte NMU E NMU E NMU E Tranrsformer Primary 240V 60Hz Secondary 23 5V 0 9A Room temperature Resistance 0 C 32 F 15kQ 10 C 50 F 9 6kQ 20 C 68 F 6 3kQ 25 C 77 F 5 4kQ thermistor 30 C 86 F1 4 3kQ 40 C 104 F 3 0kQ Liquid pipe Resistance 0 C 32 F 15kQ 10 C 50 F 9 6kQ 20 C 68 F 6 3kQ 25 C 77 F 5 4kQ thermistor 30 C 86 F 4 3kQ 40 C 104 F 3 0kQ Gas pipe Resistance 0 C 32 F 15kQ 10 C 50 F 9 6kQ 20 C 68 F 6 3kQ 25 C 77 F 5 4kQ thermistor 30 C 86 F 4 3kQ 40 C 104 F 3 0kQ Fuse Indoor con 250V 6 3A troller board Fan motor 4 pole 4 pole 4 pole 4 pole with Inner Output 75W Output 85W Sr Output 140W Output 190W thermostat D104P75MW D104P85MW NC 100VM1 NC 125VM1 SR OFF 130 C 5 C 266 F 41 F OFF 150 C 5 C 302 F 41 F thermostat Fan motor ON 90 C 20 C 194 F 68 F ON 96 C 15 C 205 F 59 F Fan motor 3 0uF X 440V 5 0uF X 440V 6 0uF X 440V capacitor Linear DC12V Stepping motor drive port dimension DC12V Stepping motor drive port dimension expansion valve 3 20 0 2000pulse EDM 402MD 5 20 0 2000pulse EDM 804MD Power supply terminal bed L1 L2 G 330V 30A Transmission terminal bed 1 2 M1 M2 S 330V 30A
14. WG 100Pa 0 401 in WG 100Pa 0 461 in WG 115Pa Address setting should be done when network remote controller PAR F25MA is being used This is the switch to be used when the indoor unit is operated with R2 series outdoor unit as a set Address board lt At delivery gt ATyay Option 66 un See Standard Address board Address can be set while the unit is stopped lt At delivery gt SW12 SW11 ALN AUX DANY DANY Address board lt At delivery gt 1 The DipSW setting is effective always after powering remote controller ON for SWA and SWC 2 The DipSW setting is effective during unit stopping remote controller OFF for SW11 12 14 and 5 17 DISASSEMBLY PROCEDURE 8 1 CONTROL BOX Be careful removing heavy parts OPERATING PROCEDURE PHOTOS 1 Removing the control box cover 1 Remove the fixing screws two of the cover A and remove the cover 1 Removing the cover 1 Remove the fixing screws two of the cover C and remove the cover 2 Removing the thermistor 1 Remove the thermistor D from the thermistor holder E which are installed on the copper tube 18 8 3 THERMISTOR Intake air temperature detection Be careful removing heavy parts OPERATING PROCEDURE PHOTOS 1 Removing the thermistor and thermistor holder 1 Pull out the thermistor holder F and thermistor G which are fixed the control box 8 4 DRAINPAN 1 Removing the cover 1 Remov
15. aution Describes precautions that should be observed to prevent damage to the unit Symbols used in the illustrations SN Indicates an action that must be avoided o Indicates that important instructions must be followed O Indicates a part which must be grounded Indicates that caution should be taken with rotating parts This symbol is displayed on the main unit label lt Color Yellow gt Beware of electric shock This symbol is displayed on the main unit label lt Color Yellow gt Warning Carefully read the labels affixed to the main unit AN Warning e Ask the dealer or an authorized technician to install the air con ditioner Improper installation by the user may result in water leakage elec tric shock or fire Install the air unit at a place that can withstand its weight Inadequate strength may cause the unit to fall down resulting in injuries e Use the specified cables for wiring Make the connections se curely so that the outside force of the cable is not applied to the terminals Inadequate connection and fastening may generate heat and cause a fire e Prepare for typhoons and other strong winds and earthquakes and install the unit at the specified place Improper installation may cause the unit to topple and result in injury e Always use an air cleaner humidifier electric heater and other accessories specified by Mitsubishi Electric Ask an authorized techni
16. cian to install the accessories Improper installation by the user may result in water leakage electric shock or fire Never repair the unit If the air conditioner must be repaired consult the dealer f the unit is repaired improperly water leakage electric shock or fire may result Do not touch the heat exchanger fins Improper handling may result in injury When handling this product always wear protective equipment EG Gloves full arm protection namely boiler suit and safety glasses Improper handling may result in injury If refrigerant gas leaks during installation work ventilate the room f the refrigerant gas comes into contact with a flame poisonous gases will be released Install the air conditioner according to this Installation Manual f the unit is installed improperly water leakage electric shock or fire may result Have all electric work done by a licensed electrician according to Electric Facility Engineering Standard and Interior Wire Regulations and the instructions given in this manual and al Ways use a special circuit f the power source capacity is inadequate or electric work is per formed improperly electric shock and fire may result Securely install the cover of control box and the panel f the cover and panel are not installed properly dust or water may enter the outdoor unit and fire or electric shock may result When installing and moving the air condit
17. e the fixing screws of the cover H and remove the cover 2 Removing the drainpan 1 Pull and remove the drainpan in the direction of the arrow 1 and alternatively 19 8 5 THERMISTOR Gus piping temperature detection OPERATING PROCEDURE PHOTOS 1 Removing the cover 1 Remove the fixing screw of the cover J and remove the cover 2 Removing the thermistor 1 Remove the thermistor K from the thermistor holder L which are installed on the copper tube 8 6 FAN and FAN MOTOR OPERATING PROCEDURE PHOTOS 1 Removing the filter 1 Press the tabs of the filter and remove the filter in the direction of the arrow Q 2 Removing the bottom plate 1 Remove the fixing screws two of the bottom plate N and remove the plate 3 Removing the cable 1 Remove the cable P threw the rubber bush 4 Sliding the fan section 1 Remove the fixing screws two of the fan base plate 2 Pull up the fan section Q in direction of the arrow 2 and slide the direction of the arrow 3 5 Removing fan casing and sirroco fan 1 Remove the fixing screws four of the fan cas ing R 2 Remove the fan motor shaft fixing screw and remove the fan casing R and sirroco fan 6 Removing the fan motor 1 Remove the condensor cable in case of Model PDFY P36 P48NMU E 2 I m Remove the fixing screws of the motor fixtures two and remove the motor Notice Incase of the Model PDFY P15 P48NMU E stick o
18. ioner to another site do not charge the it with a refrigerant different from the refrig erant R22 specified on the unit f a different refrigerant or air is mixed with the original refrigerant the refrigerant cycle may malfunction and the unit may be dam aged If the air conditioner is installed in a small room measures must be taken to prevent the refrigerant concentration from exceeding the safety limit even if the refrigerant should leak Consult the dealer regarding the appropriate measures to pre vent the safety limit from being exceeded Should the refrigerant leak and cause the safety limit to be exceeded hazards due to lack of oxygen in the room could result When moving and reinstalling the air conditioner consult the dealer or an authorized technician If the air conditioner is installed improperly water leakage elec tric shock or fire may result After completing installation work make sure that refrigerant gas is not leaking f the refrigerant gas leaks and is exposed to a fan heater stove oven or other heat source it may generate noxious gases Do not reconstruct or change the settings of the protection devices f the pressure switch thermal switch or other protection device is shorted and operated forcibly or parts other than those specified by Mitsubishi Electric are used fire or explosion may result N Warning 2 Precautions for devices that use Note the following when buildi
19. ng a heater in the air d conditioning system R41 OA refrigerant Leave enough space between units for proper ventilation so that the indoor unit temperature does not exceed 40 C when windless Keep the heater clean and take appropriate measures so that the indoor unit does not suck in the dust particles that N Caution e Do not use the existing refrigerant piping The old refrigerant and refrigerator oil in the existing piping con tains a large amount of chlorine which may cause the refrigerator accumulate on the heater oil of the new unit to deteriorate Use the optional heater cable PAC YU24HT to perform an Use refrigerant piping made of C1220 Cu DHP phosphorus interlocked operation with indoor units deoxidized copper as specified in the JIS H3300 Copper and Do not build a heater inside the indoor unit copper alloy seamless pipes and tubes In addition be sure that the inner and outer surfaces of the pipes are clean and free of hazardous sulphur oxides dust dirt shaving particles Recommended circuit oils moisture or any other contaminant Contaminants on the inside of the refrigerant piping may cause the refrigerant residual oil to deteriorate JIS Japanese Industrial Standard Wiring diagram R AS Store the piping to be used during installation indoors and keep 1 phase power s OO both ends of the piping sealed until just before brazing Store suppy elbows and other joints in a plas
20. oi sDuuiw ayi e JOJO UUOO V BU 9AOUJOJ O BINS exeuu UNI JSO AU 1 YY paijddns si samod ay pue peuesul SI 10 09UUOD ay J snonunuoo sejejedo duing ueq ay uoneJjedo uns 159 duund urep e 104 10JO9UU09 BU SI yeya ay ul V X Z sued euondo 10 INDIO ey sejeoripur eui u yo1q EU jo ped ay LILON L LON X ALONX LON ged jeuorndo sc Po de 5 SIR ES n o ZHO9 A0 Z A80Z dn i urep ee ps g jen nu Pau AlddNS H3MOd LONG OL 9u o payoene ri JT a 0 S 10 9euuoo v x m oe e LLI E vx DEE EE aed 5 pa L d pope E MERECE M NEEDS TEE gt AS Tay CWM ar e NUM ven VSLHIHVIUE oy B it e i pe p puz oN uonoeuuog 5 Ee Ol 255 Se it tr LIMS ZIMS et vs ISNA ASS T A0Sc9V d t Lin 4 eo EAS J HA E SE EE c D i D He N aA OT dos O a x08 Tnd j Le lt x Al cal i 1 SUM NS IMS QATA LINN HOOQNI LXAN OL wo x uum DL 7L 1 OS T T H3TIOHINOO 31ON3ti Es o SOHO SIE LO d3TIOHLNO9 9H T END 6 NO LENO OENI 8NO T LINN HOOGLNO OL _TT een um pera emm pet pt gt A GEI I v 049 TWNIWHAL bs a M 00 CC e HATIOHINOO 4 e _fo 310 38 VIN OL O7 g SC 039 1VNIINH3L NOISSINSNVEL S181 gt Kai A xog TOHLNO9 dO NOILOAS 3GISNI a 10 PDFY P36 48NMU E VS AOSEV OSNI ed Po Josesumg lt q gt
21. or will go lower If the detected expansion temperature is much lower than the temper valve ature indicated in the remote controller it means the valve is not closed all the way Itis not necessary to exchange the linear expansion valve if the leakage is small and not making any trouble Check the color of lead wire and missing terminal of the con Disconnect the connector nector at the controller board then check the continuity 15 Operation by switch Switch Pole Function Remarks ON OFF 4 Thermistor lt Intake temperature DS Indoor unit detection gt position Built in remote controller e Address board 2 Filter crogging detection Provided Not provided lt At delivery gt 3 Filter life 2 500hr 100hr OFF 12345678910 4 Air intake Effective Not effective s i 5 Remote indication switching Thermostat ON signal indication Fan output indication ode Selection 6 Humidifier control Always operated while the heat is ON Operated depends on the condition ir flow st Low Extra low 8 Heat thermostat OFF Setting air flow Heset to SW1 7 O Auto reset function Effective Not effective 10 Power ON OFF Effective Not effective MODELS Indoor controller board Set while the unit is off PDFY PDFY PO6NMU E P18NMU E lt At delivery gt SW Set for each capacity Capacity PDFY PDFY Sg 1 6 POBNMU E P24NMU E setting PDFY PDFY P12NMU E P2
22. s uJ9 X3 10J02 sued euondo 10 n3119 eyy sejeoipur eui uexoaq EU jo Wed oul L 3LON c ILON X LILON X LILON ued jeuondo Dine as fe ue SI YOIUM f dq NM ES E ZHO9 AQEZ 80Z dem reip ee Seal d ur d SE d SE AlddNS HAMOd ou O1 payoeye ga I i SC po Ere SI JOJOBUUOD V X sofa K oe ss a s Ze d MC acm lc GEI M cR prc EE SUIT NC ri SSES NE 2 a a ea gt See te a ee Co Inn VSL HAMVSHE Y F ul po noe ps E L3 id A 066 080 S9O auum 66 da C4 je eor eee ae TPA Ee vs1 38N3 _o As ania pou H z z e i eee I EN mtd um EEN ENS I I cl l i I MOG TIN endo ced ee 1 me E in peu Bus o m da T ea 9 peu LENO SHUMO9NO I VGA poH CN dede LAS EMS MS NS PMS I Lysa pon ep m puz oN uonoeuuog HATIOHLNOO JLONIH He LHNZ HATIOULNOO 94 L 0 Lol enia EN zi LINN HOOGLNO OL en INCNO 0110 Lalo 8MS SMS TT T3IHS S ve 9 039 IWNINYAL NOISSIWSNVH D SAL 255 L064 HJTIOHLINOO 0 ee enig usaln Moen 31OW3H VW OL Lo bt one E ja a38 TYNINHAL NOISSINSNVEL s1 81 MAN i d EEEEEEEI U EO II ee Ne di beeps xog IOHINO9 dO NOILO3S 3GISNI 11 D REFRIGERANT SYSTEM DIAGRAM Gas pipe thermistor TH23 4 Gas pipe Liquid pipe thermistor TH22 Flare connection Heat exchanger C Linear expansion valve Strainer 100mesh Room temparature thermistor TH21 Strainer 100mesh
23. s for conventional refrigerants will not react to it e Do not use a charging cylinder Using a charging cylinder may cause the refrigerant to deteriorate Be especially careful when managing the tools f dust dirt or water gets in the refrigerant cycle the refrigerant may deteriorate 88H Electromagnetic contactor 1 FEATURES Series PDFY Ceiling Concealed Built in Indoor unit Models Cooling capacity Heating capacity kW Btu h PDFY PO6NMU E 1 8 2 0 6000 6700 PDFY PO8NMU E 2 3 2 6 8000 9000 PDFY P12NMU E 3 5 4 0 12000 13500 PDFY P15NMU E 4 4 5 0 15000 17000 PDFY P18NMU E 5 3 5 9 18000 20000 PDFY P24NMU E 7 0 7 9 24000 27000 PDFY P27NMU E 7 9 8 8 27000 30000 PDFY P3ONMU E 8 8 10 0 30000 34000 PDFY P36NMU E 10 6 11 7 36000 40000 PDFY P48NMU E 14 1 15 8 48000 54000 E PART NAMES AND FUNCTIONS O Indoor Main Unit Air outlet Air inlet Remote controller PAR 21MAA Once the controls are set the same operation mode can be repeated by simply pressing the ON OFF button O Operation buttons x gt RA MITSUBISHI ELECTRIC DON OFF Tal e En NU a LE BACK MONITOR SET sn Es A CR pean me GIG PAR 21MAA CLOCK E FP OOO 906 DO 060 Set Temperature Button 5 Louver Button Test run Button Timer Menu Button Operation Button p Filter Button Monitor Set Button 6 Fan Speed Button lt Button
24. tic bag 208V 230V 60Hz OO f dust dirt or water enters the refrigerant cycle deterioration of O the oil and compressor trouble may result e Use ester oil ether oil or alkylbenzene small amount as the refrigerator oil to coat flares and flange connections The refrigerator oil will degrade if it is mixed with a large amount of mineral oil CN24 e Use liquid refrigerant to fill the system f gas refrigerant is used to seal the system the composition of the refrigerant in the cylinder will change and performance may Control board FS1 2 Thermal fuse H1 H2 Heater drop AS a si Overheat protection e Do not use a refrigerant other than R410A thermostat H another refrigerant R22 etc is used the chlorine in the refrig erant may cause the refrigerator oil to deteriorate Use a vacuum pump with a reverse flow check valve The vacuum pump oil may flow back into the refrigerant cycle and cause the refrigerator oil to deteriorate e Do not use the following tools that are used with conventional refrigerants Gauge manifold charge hose gas leak detector reverse flow check valve refrigerant charge base vacuum gauge refriger ant recovery equipment f the conventional refrigerant and refrigerator oil are mixed in the R410A the refrigerant may deteriorated f water is mixed in the R410A the refrigerator oil may deteriorate Since R410A does not contain any chlorine gas leak detector
25. tor leaking Wrong connection of the connector or contact failure valve Open 2000 pulse Opening a valve all the way Pulse number Symptom Check points Countermeasures Disconnect the connector on the controller board then con Exchange the indoor con nect LED for checking troller board at drive circuit failure 1kQ LED Pulse signal will be sent out for 10 seconds as soon as the main switch is turn on If there is LED with lights on or lights off it means the operation circuit is abnormal Motor will idle and make ticking noise when motor is operated Exchange the linear while the linear expansion valve is locked This ticking sound expansion vale is the sign of the abnormality Measure the resistance between the each coil red white Exchange the linear red orange brown yellow brown blue using a tester It is expansion valve normal if the resistance is in the range of 1509 10 To check the linear expansion valve operate the indoor unit in If large amount of refriger fan mode and at the same time operate other indoor units in ation is leaked exchange cooling mode then check the pipe temperature liquid pipe the linear expansion valve temperature of the indoor unit by the out door multi controller board operation moni tor During fan operation linear expansion valve is closed completely and if there are Thermistor d TH21 Some leaking detecting temperature of the Linear thermist
26. ut the motor shafts on both side of the motor fan motor shaft fixing screw 21 8 7 HEAT EXCHANGER OPERATING PROCEDURE PHOTOS 1 Removing the drainpan with procedure 8 4 2 Removing the cover J with procedure 8 5 3 Removing the Heat exchanger 1 Remove the fixing screws of the heat exchang er S and remove the heat exchanger a MITSUBISHI ELECTRIC CORPORATION New publication effective Aug 2005 Issued in Aug 2005 HWE05160 Specifications subject to change without notice st MITSUBISHI ELECTRIC HVAC Advanced Products Division 3400 Lawrenceville Suwanee Road e Suwanee Georgia 30024 Toll Free 800 433 4822 e Toll Free Fax 800 889 9904 www mrslim com Specifications are subject to change without notice
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