Mitsubishi Electric PAC-MK50BC, PAC
Contents
1. 11 NS Lye MS SSeJppv MS SSeJppv Sn em o m 700 ES ND 59252250 9 CORRE 297502 IRE MS 55 os MS MS SS8Jppy MS H d BEN 55 40 Gl 0 Gl 209 Ol 25 MS SSeJppy jun 7 jun 7 SEA un 400pu Sew lt 504 HNW Aug MNN BINN Aio nini nin MS 190 i queueDeueui yun 400pino 104 Je jouoo Jejpouoo YN YN Ou 1M Ou 1M ejouieJ YW 2947M 2u 1M YN VIN YN BIA uiejs s 9 9 9 9 9 eq jouueo 3N IA S i i x X i uonoeuuoo y ym euop i Ajsadoud si pue i i i i i i eui yeu euns aye 600 800 400 900 700 200 200 100 05 10 52. Ek 742 HT 5 E SUSPENSION BOLT W3 8 M10 eg ME REFRIGERANT PIPE FLARED CONNECTION 5 B TO OUTDOOR UNIT E LIQUID PIPE 1 4 1 4F 1 4 1 4F 1 4F 3 8F E GAS PIPE _ 3 8 3 8F 3 8F 3 8F 1 2F 5 8F Cr Ey 12 TERMINAL BLOCK 450 90 96 280 40 TO M NET UNIT TERMINAL BLOCK TO INDOOR UNIT 83 87 70 5 ELECTRIC WIRE INLET TO INDOOR UNIT La 58 J f H ae ET Tr Ie HA SO d CONTROL COVER TERMINAL BLOCK BUSH TO OUTDOOR UNIT TO OUTDOOR UNIT SERVICE PANEL for LEV THERMISTOR PAC MK30BC SUSPENSION BOLT PITCH 320 T aan T 5 E ag SUSPENSION BOLT W3 8 M10 REFRIGERANT FLARED CONNECTION 2 Cc TO OUTDOOR UNIT En LIQUID PIPE t 4F 1 4F t 4F 3 8F ed GAS PIPE _ 8 3 8F 3 8F 5 8F F D a e f 12 Jg 2 280 40 TOMNETUNTT TO INDOOR UNIT 83 87 70 5 ELECTRIC WIRE INLET TERMINAL BLOCK TO INDOOR UNIT En CONTROL COVER TERMINAL BLOCK T
3. TO OUTDOOR UNIT DC24 30V 5 only 7 9 a 1 n BRANCH BOX LEVE lo GRI TSHELD O 1 S 5 l aes EVD SS EBS LEVD M HS ST TO OUTDOOR UNIT 1 nos a Sis ear LEV C 4 LEVC M Q BLU M NET To ANOTHER O 1 CN3M BRANCH BOX 2 5 123 BLU LEVB MHS E EE OE a a 1 53 7 zb 52 ecc 5 9 EL ecce INDOOR UNIT E LEVA WHT i lt PAC MKSOBC only 911 sw4 3 Fig 1 POWERSUPPLY r 4 220 230 240V 50Hz THE 2THE gg OFF 52 19 26 1 GRN 234567890 12 i ee ee INDOOR UNIT D A 5 ane THD S e swig Swit o e N 1 CIRCUIT SN E POY DAT ore Sr Ween D 10 NN BREAKER E 10ths is 14559 T cT T 1 2 a THC DIGIT DIGIT SI FERE INDOOR UNIT C Jus BOX THE 9p THB El Ru IN T v O 1 10 TO ANOTHER THA epus Sl INDOOR UNIT B po Me eJ Sle LED1 S3L li gt j Q 22 1 4 Sri INDOOR UNIT A Q 9 E OCH531A 10 NECESSARY CONDITIONS FOR SYSTEM CONSTRUCTION
4. SW5 setting Detail ON a a Operation indicator S SW2 Use to set the displayed item un uum ndoor A SW5 Use to set the displayed unit 123456 ON n m ndoor B 123456 ON a ee ndoor C 123456 ON B nnum ndoor D 123456 ON see ndoor E 123456 lt Table2 gt Functions The black square m indicates a switch position SW2 setting SW5 setting Display detail Explanation for display N Common Status of branch box During start up a During error detection Displays a check code and M NET address of the unit which the check code was detected Example If the check code 2520 is detected in the address3 0 5s 0 5s 0 5s 2 0s 55 gt 25 gt 20 gt During no power supply F8 Other Displays the number of units in operation 0105 Individual unit Status of branch box During start up g O t During error detection Displays a check code and M NET address of the selected unit During no power supply F8 Other Displays an operation mode of the selected unit 0 Stop C Cool Dry H Heat d Defrost 1 Refer to the Table 1 for the appropriate setting for the function OCH531A 21 H OS The black square m indicates a switch position SW2 setting SW5 setting Display detail Explanation for display ON Common Not used Individual unit opening pu
5. 1 Refer to the Table 1 gt for the appropriate setting for the function SW4 1 OFF ON F OCH531A 23 8 BRANCH BOX PAC MK50BC OPERATING PROCEDURE DISASSEMBLY PROCEDURE PHOTO PAC MK50BC PHOTOS 1 Removing the controller cover and under panel 1 Remove 3 controller cover fixing screws 4 x 10 to detach the controller cover See Photo 1 2 Remove 4 under panel fixing screws 4 x 10 to remove the under panel See Photo 1 Photo 1 Under panel fixing screws Controller cover Under panel fixing screw Controller cover Controller cover fixing screws 2 Removing the thermistor 1 Remove the controller cover See Photo 1 2 Remove the under panel See Photo 1 3 Remove 8 insulations then remove 9 pipe box under fix ing screws 4 x 10 See Photo 2 1 4 Pull out the thermistor s from the sensor hold ers mounted on the gas pipe See Photo 2 2 5 Loosen the insulation sheet which bundles the thermistor connectors 6 Loosen the side clamps then disconnect the connector s on the controller board 7 Pull out the lead wire s through the hole to the controller board side Photo 2 1 Pipe box under fixing screws Screws Photo 2 3 Sensor holder Insulation sheet Band OCH531A TH A C for PAC MK30BC See Photo 2 3 Under Insulations Screw Insulations 15
6. P 125 Y Outdoor unit MULTI S Frequency conversion controller Indicates equivalent to Cooling capacity k cal h m Branch box Refrigerant R410A M NET control model type Power supply V Single phase 220 230 240 V 50 Hz Y 3 phase 380 400 415 V 50 Hz m Symbol of factory 510 BC Indispensable Optional parts OCH531A Model type Number of branches 5 5 branches 3 3 branches 5 Sub number Outdoor unit Salt proof type Branch box Controller 2 2 INSTALLATION 2 2 1 Space required for Installation and servicing for Branch box 1 Front View Fig 2 1 0 Branch box On the side of piping 2 Side View Fig 2 2 Fig 2 3 For indoor installations Ceiling board Maintenance hole 1 Aminimum 350 mm is required for 90 bends in refrigerant piping 2 is Min 200 mm In the case of less than 200 mm for example A is 100 mm the exchange work of Branch box from a maintenance hole becomes difficult Only exchange work of a PCB linear expansion valve coils and sensors is possible 3 B is 600 In 2 of 0 450 prepare a maintenance hole at a PCB side as it is shown in Fig 2 3 Min 300 mm is needed as distance In the case of less than 300 mm for example A is 100 mm the exchange work o
7. 2 SW4 1 OFF C ON F OCH531A 22 t O The black square m indicates a switch position SW2 setting SW5 setting Display detail Explanation for display ON Common Not used Individual unit Indoor thermistor 39 to 88 38 to 190 pipe temperature _ When the temperature is 0 or less and temperature 2 phase gt TH5 are displayed by turns C Example When 5C 0 5 0 5 2 05 E 5 gt Common Not used Individual unit box pipe 42 to 91 43 to 196 thermistor TH A B C When the temperature is O C or less and temperature D E are displayed by turns C Example ere When 5C 0 5s 0 5s 20s H gt 05 gt O Common Not used un Individual unit Indoor thermistor 8 to 39 43 to 102 room temperature o 1 Not used Individual unit Set temperature of 16 to 31 61 to 88 indoor unit Common S W version Displays a S W version number Example If itis a ver 12 34 0 5s 0 5s 20s 12 234 Individual unit Common Not used Individual unit LEV opening pulse 0 to 2000 gear operated value Common S W ROM check sum 0000 to FFFF Individual unit Example If itis OBC9h 0 5s 0 5s 20s b Cc9 gt
8. 4 Trouble If the MA remote controller the ME remote controller or the system controller shows the abnormal indication clear it by stopping the operation with one of the followings the MA remote controller the ME remote controller the system controller or the wireless remote controller Abnormal indication of the air conditioner could be recovered automatically but that of the MA remote controller the ME remote controller or the system controller cannot be recovered unless the operation is stopped OCH531A 13 The use of an inadequate breaker can cause the incorrect operation of D 5 Group setting MA group or M NET group setting cannot be set 6 Restricted functions The following functions of system controller cannot be used DIDO controller Interlock with the air conditioner Fan control of energy saving control or peak cut control function Air conditioning charge TG 2000A Set temperature range limiting function Operation mode changeover limit season changing PAC SF44SRA Dual set point function OCH531A 14 7 TROUBLESHOOTING 7 1 HOW TO CHECK THE PARTS BRANCH BOX PAC MK50BC PAC MK30BC Parts name Check points AL Disconnect the connector then measure the resistance with a tester nm 2 AE At the ambient temperature 10 to 30 C Normal Abnormal 4 3 to 9 6kQ Open or short Linear expansion valve Disconnect the connector then measure the r
9. LINN HOOQNI 1 7 1 6 104 jun Joopul uoee 5 330 Buiuun eJojeg l193NNOO 1 LON O LIND HOOQNI LMS eu NO UN un JOOP NO pejo euuoo si yun Joopul uoee Jeyv NO LO3NNOO LO3NNOO LON 8 LIND __ Z LMS 1O3NNOO LO3NNOO LON Y LINN _ 5 sDumes jenuj gt NO 3 0 Bumps seppe uBip Bip suey s uo sua 2 Op SAL CA ES NO y 6 O LLMS pue 0 1e 0 CN EN S EIMS 658 es Buiuum 10 ZL MS 2 si sseJppe ejduex3 Wm RER 2 ausse ZIMS 5 55 195 MOH ZIMS g SUO lt jenluj gt TEMS uoneuuoju jeuonippy ad No uonounJ dej U93IA i 5 Bumes uoe3 uoneiedo i gt mS 20 OCH531A en 7 4 BRANCH BOX UNIT OPERATION MONITOR FUNCTION lt Branch box unit operation monitor function gt When option part A Control Service Tool PAC SK52ST is connected to branch box controller board CNM Digital indicator LED1 displays 2 digit number or code to inform operation condition and the meaning of check code by controlling DIP SW2 on A Control Service Tool lt Table1 gt SW5 setting The black square m indicates a switch position
10. Strainer 100 Strainer 100 Capillary iube J unit mm Capillary tube behind LEV in cooling mode PAC MK50BC 24 x 3 0 x L130 x 5 Branch box OCH531A 04 x 63 0 x L130 x 3 12 6 3 TYPICAL CONTROL SYSTEM Branch Box 54 1 HHH mano Outdoor unit s 5 s sj 0 M IC M NET Control indoor unit City Multi indoor unit e A IC A control indoor unit M P S series indoor unit os sis MA Remote controller Ei WL RC Wireless Remote controller ese m TET E Auc HHE maro E sj e ATE mo Um 5 fon A s m a sI AiG EJ 05 NN e Branch Box 5 MA RC IMPORTANT WLAC sure that the current leakage breaker is one compatible with higher harmonics xsgonirolle EE Always use a current leakage breaker that is compatible with higher wipes harmonics as this unit is
11. SW1 3 INDOOR NOT CONNECT CONNECT normal operating SW1 4 INDOOR UNIT D NOT CONNECT CONNECT PAC MK SW1 5 INDOOR 0 CONNECT CONNECT Meaning Function SW1 6 NO USE LED 1 Main power supply Lamp is lit After each indoor unit is connected to the outdoor unit turn on RED Total numberof Blink the switch corresponding to each indoor unit For example indoor units example The total number is when the indoor units are connected to INDOOR UNIT A Blink 2 times and C turn SW1 1 and SW1 3 to on Turn off for three sec Repeat O to 2LED on Branch box controller board for service 3D and E for PAC MK50BC only Symbols used in wiring diagram Terminal block oo Connector Combination of indoor units Ni Enter the location of combined indoor units with model name in each switch m black Square indicates blank below because it is necessary for service and maintenance a switch position Indoor unit A Indoor unit B Indoor unit C Indoor unit D Indoor unit E
12. equipped with an inverter Shielded wire Address example inverter MA RC Longest length via outdoor units L1 L2 L3 L4 L5 500 m 1640 ft 1 25 mm or more Longest transmission cable length MA RC L1 L2 L3 L3 L4 L5 S 200 m 656 ft 1 25 mm or more 1 Difference between display and operation When operating the system using the system controller or the ME remote controller details of those operations will not appear on the display of the wireless remote controller The set temperature range is different in the wireless remote controller that comes with room air conditioner and the ME remote controller or the system controller The room air conditioner has a wider range If the target temperature is set to below 17 C 63 F or less or 30 C 86 F or more by the wireless remote controller that comes with room air conditioner the temperature displayed on the ME remote controller or the system controller may be converted to their maximum minimum set temperature For instance when HEAT operation at 16 C 61 F is set at the room air conditioner the ME remote controller or the system controller may display 17 C 63 F amp When the DRY mode is set with the wireless remote controller the room air conditioner automatically set the optimum target temperature The ME remote controller or the syste
13. is locked sound can 5 i be heard E No sound is heard when the pulse number moves from 8 to in S i case coil is burnt out or motor is locked by open phase gt Close Open Sound can be detected by placing the ear against the screw driver handle while putting the screw driver to the linear expansion valve i 500 pulse Opening a valve _ all the way I Pulse number Extra tightening about 32 pulse OCH531A 16 3 How to attach and detach the coil of linear expansion valve Composition Linear expansion valve is separable into the main body and the coil as shown in the diagram below Coil Main body Lead wire Stopper How to detach the coil Hold the lower part of the main body shown as A firmly so that 1 the main body does not move and detach the coil by pulling it upward Be sure to detach the coil holding main body firmly Otherwise pipes can bend due to pressure A How to attach the coil GNE Hold the lower part of the main body shown as A firmly so that EOS i the main body does not move and attach the coil by inserting it mc i downward into the main body Then securely attach the coil stop per to pipe B At this time be careful that stress is not added to gt 1 lead wire and main body is not wound by lead wire If the stopper is not firmly attached to pipe B coil may be detached from the main body and that can cause defective operation of l
14. service install a filter drier simultaneously Be sure to use a filter drier for new refrigerant 2 Additional refrigerant charge When charging directly from cylinder Check that cylinder for RA10A on the market is a syphon type Charging should be performed with the cylinder of syphon stood vertically Refrigerant is charged from liquid phase 3 Service tools 1 Use the below service tools as exclusive tools for R410A refrigerant Tool name Specifications Only for RA10A Gauge manifold Use the existing fitting specifications UNF 1 2 Use high tension side pressure of 5 or over Only for RA10A Use pressure performance of 5 09 or over Electronic scale Gas leak detector Use the detector for R134a R407C or R410A Adaptor for reverse flow check Attach on vacuum pump Refrigerant charge base Only for R410A of cylinder Pink Oylinder with syphon Charge hose Refrigerant cylinder Refrigerant recovery equipment OCH531A 3 2 Cautions for refrigerant piping work New refrigerant R410A is adopted for replacement inverter series Although the refrigerant piping work for RA10A 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 differ
15. 10A R22 1 4 6 35 9 1 3 8 9 52 13 2 17 0 17 0 1 2 12 70 16 6 5 8 15 88 19 7 3 4 Tools and materials Gauge manifold Charge hose 19 05 Air purge refrigerant charge and operation check R410A tools Tool exclusive for R410A Tool exclusive for R410A Can R407C tools be used Gas leak detector Gas leak check Tool for HFC refrigerant Refrigerant recovery equipment Refrigerant recovery Tool exclusive for R410A Refrigerant cylinder Refrigerant charge Tool exclusive for R410A Applied oil Apply to flared section Ester oil and alkylbenzene oil minimum amount Ester oil Alkylbenzene oil minimum amount Safety charger Prevent compressor malfunction when charging refrigerant by spraying liquid refrigerant Tool exclusive for R410A x Charge valve Prevent gas from blowing out when detaching charge hose Tool exclusive for R410A x Vacuum pump Vacuum drying and air purge Tools for other refrigerants can be used if equipped with adop ter for reverse flow check A Usable if equipped with adopter for rever se flow A Usable if equipped with adopter for rever se flow Flare tool Flaring work of piping Tools for other refrigerants can be used by adjusting flaring dimension A Usable by adjusting flaring dimension A Usable by adjusting flaring dimension
16. 14 MITSUBISHI ELECTRIC CORPORATION Distributed in Mar 2015 No OCH574 REVISED EDITION A Distributed in Sep 2014 No OCH574 New publication effective Mar 2015 Made in Japan Specifications are subject to change without notice
17. 8195 SIU J 010 yun 9 v d a j n opt v 001 Ajjeonewoyne yun joopu iun yun Joopu 5 S ou Seu iii tonuo lonuoo v lonuoo v Ioue january id o o 9 9 9 o 050 100 7 nin Aio H H F H 9 0 100 uoueig EN EN 001 190 iun joopino SHARES IRS 195 MS SSeJppv MS 5 5 o 900 100 uoueJq pue uieis s ueJeDujei pejoeuuoo eq asnu eiqeo LIN N D ENEN NO MS i MS L3N IN yun NNN iro uoueJg 104 190 yun 100pjno 404 6 1 TRANSMISSION SYSTEM SETUP N N OCH531A Pn 6 2 REFRIGERANT SYSTEM DIAGRAM m PAC MK50BC m PAC MK30BC Thermistor Gas pipe temperature l l l l l l LEV A E l Strainer 100 Strainer 100 Capillary tube Linear expansion valve Thermistor TH A C Gas pipe temperature LEV A C Linear expansion valve
18. Bender Bend the pipes Tools for other refrigerants can be used Pipe cutter Cut the pipes Tools for other refrigerants can be used Welder and nitrogen gas cylinder Weld the pipes Tools for other refrigerants can be used Refrigerant charging scale Refrigerant charge Tools for other refrigerants can be used Vacuum gauge or thermis tor vacuum gauge and vacuum valve Check the degree of vacuum Vacuum valve prevents back flow of oil and refri gerant to thermistor vacuum gauge Tools for other refrigerants can be used Charging cylinder Refrigerant charge Tool exclusive for R410A X Prepare a new tool Use the new tool as the tool exclusive for R410A Tools for other refrigerants can be used under certain conditions Tools for other refrigerants can be used OCH531A 4 2 1 SYSTEM OUTLINE The additional connection of the Branch Box together with employment of the compact trunk looking outdoor unit can successfully realizes a long distance piping for big houses Equipped with a microprocessor the Branch Box can trans late the transmission signal of indoor units to achieve the optimum control 2 1 1 System example Outdoor unit 2 1 2 Method for identifying m Outdoor unit Branch Box 2 OVERVIEW OF UNIT Indoor unit Wall mounted type PU MI Y
19. MITSUBISHI ELECTRIC SPLIT TYPE HEAT PUMP AIR CONDITIONERS HFC utilized R410A March 2015 No OCH574 REVISED EDITION A TECHNICAL amp SERVICE MANUAL Model Name Service Ref Revision lt Branch box gt Corrected some errors in 7 1 PA M K B HOW TO CHECK THE PARTS PAC MK50BC in REVISED EDITION A Some descriptions have been PAC MK30BC p AC M K30 B C modified Please void OCH574 Indispensable optional parts for PUMY P112 125 140VKM1 and PUMY P112 125 140YKM1 b MR technical data of branch box As for indoor units and outdoor unit refer to its service manual CONTENTS 1 SAFETY PRECAUTION 2 2 OVERVIEW OF UNIT 2 2 5 3 SPEGIFIGATIONS m B M 0 nS 8 4 OUTLINES AND DIMENSIONS 9 5 WIRING DIAGRAM 10 6 NECESSARY CONDITIONS FOR SYSTEM CONSTRUCTION 11 7 TROUBLESHOOTING 15 8 DISASSEMBLY PROCEDURE 24 BRANCH BOX PARTS CATALOG OCB574 1 SAFETY PRECAUTION 1 1 ALWAYS OBSERVE FOR SAFETY Before obtaining access to terminal all supply circuit must be disconnected 1 2 CAUTIONS RELATED TO NEW REFRIGERANT Cautions for units utilizing refrigerant R410A Use new refrigerant pipes Do not use refriger
20. O OUTDOOR UNIT TO OUTDOOR UNIT SERVICE PANEL BUSH for LEV THERMISTOR OCH531A 9 5 WIRING DIAGRAM PAC MK50BC PAC MK30BC Note PAC 50BC is only for R410A SYMBOL NAME B C Branch box controller board lt Note gt 1 Fi B C lt T6 3AL 250V gt 1 At servicing for outdoor unit F2 F4 B C T10AL 250V gt SW1 B C Switch for indoor unit connection 1 always follow the wiring diagram SW4 B C Switch for mode selection of outdoor unit ECCE se cel 2 When work to supply power lt b U gt onnector Connection tor service gt LED12 lt B C gt Light emitting diode 2 separately to Branch box and outdoor LEV A E Linear expansion valve 3 units are applied refer to Fig 1 TH A E Thermistor lt Gas pipe gt 3 i TB2B Terminal block lt To Power Supply gt Me connection method please TB5 Terminal block Transmission refer to the Branch box Installation B C Terminal block To indoor unit A E 3 Manual SW11 B C Setting 1s DIGIT SW12 B C Address Setting 10ths DIGIT 1 SW1 setting start up OFF ON Mark Meaning Function SW1 1 INDOOR UNIT A NOT CONNECT CONNECT LED 1 Main power supply Main power supply 220 230 240V SW1 2 INDOORUNIT B NOT CONNECT CONNECT LED2 Power on Lamps are lit
21. ant other than R410A If other refrigerant R22 etc is used chlorine in refrige Make sure that the inside and outside of refrige rant can cause deterioration of refrigerant oil etc rant piping is clean and it has no contaminants such as sulfur oxides dirt shaving particles etc which are hazard to refrigerant cycle In addition use pipes with specified thickness Use a vacuum pump with a reverse flow check valve Vacuum pump oil may flow back into refrigerant cycle and that can cause deterioration of refrigerant oil etc Contamination inside refrigerant piping can cause deterio ration of refrigerant oil etc Use the following tools specifically designed for use with R410A refrigerant Store the piping indoors and both ends of the piping sealed until just before brazing The following tools are necessary to use R410A refrigerant Leave elbow joints etc in their packaging Tools for RA10A If dirt dust or moisture enters into refrigerant cycle that can Gauge manifold Flare tool cause deterioration of refrigerant oil or malfunction of com Charge hose Size adjustment gauge pressor Gas leak detector Vacuum pump adaptor Torque wrench Electronic refrigerant charging scale The refrigerant oil applied to flare and flange connections must be ester oil ether oil or alkylbenzene oil in a small amount If large amount of mineral oil enters that ca
22. ent D Thickness of pipes Because the working pressure of R410A is higher compared to R22 be sure to use refrigerant piping with thickness shown below Never use pipes of 0 7 mm or below Diagram below Piping diameter and thickness Nominal dimensions in Outside diameter mm Thickness mm 1 4 6 35 3 8 9 52 1 2 12 70 5 8 15 88 3 4 19 05 Dimensions of flare cutting and flare nut The component molecules in HFC refrigerant are smaller compared to conventional refrigerants In addition to that R410A is a refrigerant which has higher risk of leakage because of its working pressure higher than that of other refriger ants Therefore to enhance airtightness and strength flare cutting dimension of copper pipe for R410A has been speci fied separately from the dimensions for other refrigerants as shown below The dimension B of flare nut for R410A also has partly been changed to increase strength as shown below Set copper pipe correctly referring to copper pipe flaring dimensions for R410A below For 1 2 and 5 8 inch pipes the dimension B changes Use torque wrench corresponding to each dimension 1 Flare cutting dimensions Nominal dimensions in Outside diameter mm Dimension 4 E w fae Dimension B Flare nut dimensions mm R410A Nominal dimensions in Outside Dimension B mm diameter mm R4
23. esistance with a tester LEV A E Winding temperature 20 C Normal Abnormal Red White Red Orange Red Yellow Red Blue DHE Open or short Orange 46 40 Yellow White OCH531A 15 HE Linear expansion valve LEV in Branch box 1 Operation summary of the linear expansion valve Linear expansion valve open close through stepping motor after receiving the pulse signal from the branch box controller board Valve position can be changed in proportion to the number of pulse signal Connection between the branch box controller board and the linear expansion valve branch box controller board Connector LEV A LEV B LEV C LEV D LEV E Output 415 Opening a valve 8 7 5655545352518 Closing a valve 1525 354555657581 The output pulse shifts in above order When linear expansion valve operation stops all output phases become OFF When the switch is turned on 700 pulse closing valve signal will be sent till it goes to point in order to define the valve position The pulse signal is being sent for about 20 seconds 2 Linear expansion valve operation Pd B When the valve moves smoothly there is no sound or vibration 8 i occurring from the linear expansion valve however when the pulse 2 number moves from amp or when the valve
24. f Branch box linear expansion valve coils and sensors from a maintenance hole becomes difficult Only exchange work of a PCB is possible 3 Top View Fig 2 4 Refrigerant piping gt NOTE1 branch box is only for indoor use NOTE2 Please attach the special optional cover PAC AK350CVR E to install branch box in the outdoors unit mm Min 250 Fig 2 4 OCH531A 6 2 2 3 SIMPLIFIED PIPING SYSTEM Piping connection size The piping connection size differs according to the type and capacity of indoor units Match the piping connection size of branch box with indoor unit If the piping connection size of branch box does not match the piping connection size of Gas mm indoor unit use optional different diameter deformed joints to the branch box side Connect deformed joint directly to the branch box side Liquid mm Flare connection employed No brazing m In case of using 1 branch box Flare connection employed No brazing Branch box m In case of using 2 branch boxes 2 branches pipe joint optional parts A A Branch box 1 Branch box 2 m Installation procedu
25. inear expan sion valve To prevent piping stress be sure to attach the coil holding the main body of linear expansion valve firmly Otherwise pipe may break Be sure to attach the stopper to pipe B OCH531A 17 EE Troubleshooting Problem Check point Corrective measure Locked expansion valve If the linear expansion valve becomes locked and the motor is still operating the motor will emit a clicking noise and will not function This clicking noise indicates an abnormality Replace the linear expansion valve Short circuit or broken circuit in expansion valve motor coil Use an all purpose electrical meter to measure the resistance between the different coils red white red orange brown yellow brown blue Normal resistance is within a range of 460 4 Replace the linear expansion valve Valve does not close completely In order to check the linear expansion valve operate 1 indoor unit in the fan mode and another in the cooling mode Then use the outdoor multi controller board to operate the monitor and check the pipe temperature of the indoor unit The linear expansion valve should be fully closed when the fan is operating The temperature measured by the temperature sensor will drop if there is any leakage If the measured temperature is significantly lower than that on the remote controller this indicates that the valve is not closed It is not necessary to replace the linear ex
26. lse 0 to 500 of LEV When it is 100 pulse or more it displays a hundredth Direct operated NS 5222 value tens and ones digit by turns 0 to 500 Example When 150 pulse 0 5s 0 5s 2 05 1 50 gt O 1 Common Not used Individual unit history Displays a check code and M NET address of the unit which the check code was detected Example If the check code 2520 is detected in the address3 0 5s 0 5s 0 5s 2 0s Common The number of unit s 0105 operating in Thermo ON Individual unit Operating status of unit 83 Abnormal 00 Stop 06 Forced stop OC Defrost 29 Hot adjust mode 05 Standby mode 2A Auxiliary heater is ON 0A Thermo ON 01 In operation The number of indoor 0to5 unit 5 connected to this branch box Individual unit address 00 to FF Displays an M NET address of the selected unit Common Not used Z Individual unit Capacity setting in Qj 03 to 50 Common Not used Individual unit Indoor thermistor 39 to 88 38 to 190 lt pipe temperature When the temperature is 0 C or less and temperature liquid gt TH2 6 are displayed by turns C Example FT When 5C 0 5s 0 5s 20s a gt 15 gt O 1 Refer to the lt Table 1 gt for the appropriate setting for the function
27. m controller will display the target temperature as a set temperature When the DRY mode is set with the ME remote controller or the system controller the room air conditioner performs the DRY mode control operation according to the temperature set with the ME remote controller or the system controller 2 Timer operation Timer operation should be set using only one controller from the remote controller that comes with the room air conditioner the system controller the MA remote controller or the ME remote controller If more than one controller is used to set the timer at the same time the timer will not function properly When the timer is set with the wireless remote controller the ME remote controller or the system controller will not show the timer display The timer set with the ME remote controller or the system controller will not be cancelled with the wireless remote controller 3 Manual operation prohibition When the manual operation ON OFF set temperature or operation mode is prohibited with the system controller the command to perform the prohibited operation will not be accepted from the wireless remote controller that comes with the room air conditioner The operation partially enabled by the system controller can be operated with the wireless remote controller Regardless of whether the operation is disabled or enabled three short beeps will sound when the signal is sent from the wireless remote controller
28. move 8 the insulations then remove 9 pipe cover fixing screws 4 x 10 See Photo 2 1 4 Loosen the side clamps then disconnect the LEV connec tors on the controller board 5 Pull out the lead wires through the hole to the controller board side Removing the header assy gt 6 Cut the band which fixes the header assy and LEV assy together then remove the rubber mount See Photo 3 7 Remove the header assy See Photo 5 1 lt Disassembling the pipe box 8 Remove 2 side panel fixing screws 4 x 10 See Photo 5 1 9 Pull out the pipe box top and separate it from the side panel See Photo 5 2 10 Turn the pipe box top upside down See Photo 5 3 11 Remove 5 insulations then remove 5 pipe box top fixing screws 4 x 10 Photo 5 2 12 Turn the pipe box top upside down again facing the pipe side up 13 Separate the pipe box center from the pipe box top See Photo 5 4 Side panel 14 Remove the LEV assy LEV assy Pipe box cap only for PAC MK30BC gt The pipe box caps are placed in 2 unused pipe holes between the pipe box top center and under See Photo 5 5 Photo 5 4 Pipe box center Pipe box top Photo 5 3 Insulations 15 x 15 x 35 Photo 5 5 Pipe box caps Pipe box top fixing screws OCH531A 26 OCH531A 27 MITSUBISHI ELECTRIC CORPORATION HEAD OFFICE TOKYO BLDG 2 7 3 MARUNOUCHI CHIYODA KU TOKYO100 8310 JAPAN Copyright 20
29. n cause deterio Handle tools with care ration of refrigerant oil etc If dirt dust or moisture enters into refrigerant cycle that can cause deterioration of refrigerant oil or malfunction of com Charge refrigerant from liquid phase of gas pressor cylinder If the refrigerant is charged from gas phase composition Do not use a charging cylinder change may occur in refrigerant and the efficiency will be m lowered If a charging cylinder is used the composition of refrigera nt will change and the efficiency will be lowered Use the specified refrigerant only Ventilate the room if refrigerant leaks during Never use any refrigerant other than that specified operation If refrigerant comes into contact with Doing so may cause a burst an explosion or fire when the a flame poisonous gases will be released unit is being used serviced or disposed of Correct refrigerant is specified in the manuals and on the spec labels provided with our products We will not be held responsible for mechanical failure system malfunction unit breakdown or accidents caused by failure to follow the instructions OCH531A 2 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
30. pansion valve if the leak of refrigerant is small and does not cause a malfunction Replace the linear expansion valve if there is a major leak of refrigerant Incorrect connection or connection failure OCH531A Check improperly connected connector terminals and the wire colors Remove the connector on the controller board side and check electrical conductance 18 Continuity check of wrong part 7 2 TEST POINT DIAGRAM Branch box controller board PAC MK50BC PAC MK30BC TH A to E Connect to LEV A to E Thermistor A to E Connect to LEV A to E TH D and E for PAC MK50BC only LEV D and E for PAC MK50BC only Eds 8 5 SENE C LEV D aro LEVE m 190 CO eco 5 CN3M 12 22 s Connected to the terminal nn block TB5 transmission con necting wire 24 30 V DC non polar LED1 LED2 Start up Main power supply 220 230 240 V AC Normal operating LED1 Main power supply LED2 Blink depend on the total number of indoor units lt Example gt The total number is 2 Blink 2 times Turn OFF for 3 seconds Repeat O SW4 Mode selection SW12 Address setting 10ths DIGIT SW11 Address setting 1s DIGIT F1 Fuse 6 3A250V SW5 Service setting SW1 CND Indoor unit connection Power supply for Branch box Controller board 220 230 240 V AC gt F2 F3 F4 Fu
31. re 2 branch pipe joint Refer to the installation manuals of MSDD 50AR E and MSDD 50BR E OCH531A 7 Model Name 3 SPECIFICATIONS PAC MK50BC PAC MK30BC PAC MK50BC PAC MK30BC Connectable number of indoor units Maximum 5 Maximum 3 Power supply from outdoor unit Single phase 220 230 240V 50Hz Single phase 220V 60Hz Input 0 003 Running current 0 05 Max 6 External finish Galvanized sheets Dimensions Width 450 Depth 280 Height 170 Weight 7 4 6 7 Piping Branch indoor side connection Liquid 2635 x 5 AB C D E 6 35 x 3 A B C Gas 9 52 x 4 A B C D 412 7 X 49 52 x 3 A B C Flare Main outdoor side Liquid 9 52 Gas 15 88 The piping connection size differs according to the type and capacity of indoor units Match the piping connection size for indoor and branch box If the piping connection size of branch box does not match the piping connection size of indoor units use optional different diameter deformed joints to the branch box side Connect deformed joint directly to the branch box side OCH531A 4 OUTLINES AND DIMENSIONS PAC MK50BC unit mm SUSPENSION BOLT PITCH 320
32. se 10A 250 V F4 for PAC MK50BC only TB3A to E Connect to indoor unit TB3D and TB3E for PAC MK50BC only G Power supply 9 0 Transmission Q amp 220 230 240 VAC 0 24 V DC OCH531A 19 7 3 INTERNAL SWITCH FUNCTION TABLE The black square m indicates a switch position sey yun eu Jaye 51215 uoreJojsa U JEU OJON Zx 280SMIA OVd x 997601 0 Aue WNOLLONN4 HOLINOW E ncn je pejeAgoe eq ue NOILIVU3dO LINN SMS lt 8 enu t Z 01 10 ON LINN HOOQNI NE 01 6 z NO 9eq amod Jamod eui SEM eu ueuw opewopny Buluan 9 95 jeg opo uoneJedo SJn290 uoneoiunuluJoo _____ E penuguog 49 995 LAN W j uoneiedo a o Ajuo J0 98 19S OvZ 0 z 40 022 Buas 5 Z sbumes eniu NO y ergeidua euojeg amegdua snp uL 435 10 ___ 9 5 NO 9 LMS pue 1O3NNOO LO3NNOO LON 3 LINn HOOQNI 1 5 1 6 uomoeuuoo L LMS UN 5 pue V LIN 1 HOOQNI pejoeuuoo Sun JOOPU 967621 NO 4emod y 1O3NNO2 93NNOO
33. x 12 x 45 15 x 15 x 46 Photo 2 2 Sensor holder Header assy hole Insulation sheet 24 OPERATING PROCEDURE PHOTOS 3 Removing the LEV coil LEV A E Photo 3 1 Remove the controller cover See Photo 1 2 Remove the under cover See Photo 1 3 Remove 8 insulations then remove 9 pipe cover fixing Bands LEV screws 4 x 10 See Photo 2 1 4 Cut the bands that fixes the lead wire then pull out the LEV coil s LEV A E See Photo 3 5 Loosen the insulation sheet which bundles the LEV lead wires 6 Loosen the side clamps then disconnect the connector s on the controller board 7 Pull out the lead wire s through the hole to the controller board side See Photo 2 2 or 2 3 Rubber mount Bands Header assy LEV A C for PAC MK30BC See Photo 2 3 LEV coil 4 Removing the controller board Photo 4 1 Remove the controller cover See Photo 1 2 Loosen the side clamps then disconnect the connectors on the controller board 3 Pick an upper edge of the controller board then pull for ward The controller board is fixed to the controller board holder with 4 hooks See Photo 4 4 Remove the controller board from the controller board holder Controller board Controller board holder OCH531A 25 OPERATING PROCEDURE PHOTOS 5 Removing the LEV assy Photo 5 1 1 Remove the controller cover See Photo 1 2 Remove the under panel See Photo 1 3 Re
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