Home

SERVICE MANUAL

1. ELE eias te Airflow 494 rate m3 min cfm MVZ A18AA4 Vertical Horizontal Right Horizontal Left Static pressure Pa in WG Static pressure Pa in WG Static pressure Pa in WG External static pressure 0 30 in WG 75Pa 208 230V 60Hz 100 0 40 75 0 30 50 0 20 25 0 10 0 10 15 20 530 Airflow rate m3 min cfm External static pressure 0 50 in WG 125Pa 208 230V 60Hz m 0 60 125 0 50 100 Airflow rate m3 min cfm External static pressure 0 80 in WG 200Pa 208 230V 60Hz 7 706 Airflow rate m3 min cfm Static pressure Pa in WG Static pressure Pa in WG Downflow External static pressure 0 30 in WG 75Pa 208 230V 60Hz ee 0 40 75 0 30 50 0 20 25 0 10 of 7072 2 17707777 3 0 10 15 20 353 530 706 Airflow rate m3 min cfm External static pressure 0 50 in WG 125Pa 208 230V 60Hz 150 RI 125 0 50 100 0 40 75 0 30 50 0 20 25 010140 15 20 353 530 706 Airflow rate m3 min cfm Exter
2. audible limit 63 125 continuous noise 5555 ee 250 500 1 2k 4k 8k Octave band center frequencies Hz NC 60 NC 50 NC 40 NC 30 NC 20 NC 60 NC 50 NC 40 NC 30 NC 60 NC 50 NC 40 NC 30 NC 20 14 6 OUTLINES amp DIMENSIONS INDOOR UNIT MVZ A12 18 24 30 36AA4 91 g 91 948 18 91 6 2 2 26 996 09 4 1 PVV98V ZAN 62 2 2 907 809 2 9215 19114 8 61 91 1 81 2 1 GC 99 1 218 edid seb O 8 1 SLX9 VE L v L 07 9 6 IRRIS KS 9 lt 050 0004 000 004 5525524 25650 KOSS 91 1 62 1 79 z L 01 12 VVV9EV ZAIN 162 8461 FVV08V ZAN 2 7 09 81 8 pVV8LV ZAN VVVcLV ZAN pH 95 3 9 8 49 epis 1614 epis Je woog 91 2 2 99 7 2 2 590 61 8 gt Aaea 7 2 2 50 612 edidurmep edid 2 80 610 8 8 6 26 edi
3. 1 CNXC1 CNXA1 CNMF PC51 Cn C25 C 4 32 CND Power supply voltage 208 230VAC CNMF Fan motor output 1 4 310 340 VDC 5 4 15 6 4 0 6 5 VDC 7 4 Stop or 15 VDC 7 5 0 15 pulse Connect to the indoor controller board CNXB1 Connect to the indoor controller board CNXC1 Connect to the indoor controller board CNXA2 Connect to the indoor power board CNXB2 Connect to the indoor power board CNXC2 Connect to the indoor power board 71 Vra Voltage on the side of PC51 and C25 Same with the voltage between 7 and 4 of CNMF Voltage between the C25 pins 15 VDC Same with the voltage between 5 and 4 of CNMF Vsp Voltage between the C53 pins OVDC with the fan stopped 1 6 5VDC with the fan in operation Same with the voltage between 6 and 4 of CNMF 12 5 2 Indoor controller board MVZ A12AA4 MVZ A18AA4 MVZ A24AA4 MVZ A30AA4 MVZ A36AA4 CN105 CN22 uc SAQSS DOC e EA Lact _N R217 r 9212 X 311 ga 312 3 DA31 a fey ak 4 gt BB ox B MOOHS 91415578 MOS 5 8 9 2 33 CN51 SWE Emergency operation SW1 Model selection SW2 Capacity setting CN105 Radio frequency interface CN32 Remote st
4. remote controller When RC is displayed When 00 06 is displayed gt may be causing abnormality If the unit is not normal after replacing indoor controller board in group control indoor controller board of address 0 may be abnormal Remote controller transmission error E3 signal receiving error E5 Two remote controller are set Set a remote controller to main and the Abnormal if remote controller could not as other to sub find blank of transmission path for six In case of 2 remote con seconds and could not transmit Error code trollers f l Remote controller receives transmitted Remote controller is connected Remote controller is connected with only one data at the same time compares the with two indoor units or more indoor unit data and when detecting it judges Repetition of refrigerant The address changes to a separate setting different data to be abnormal 30 address continuous times Error code E3 Defective transmitting receiving Diagnose remote controller circuit of remote controller a When RC OK is displayed remote con D Abnormal if indoor controller board could rollers find blank of transmission path Defective transmitting receiving rovers nave no problem f E3 Error code E5 circuit of indoor controller E power ra to ade e Indoor contro
5. minimum 15 0 L audible limit on continuous noise 2k 4k 8k Octa e band center frequencies Hz External static pressure 0 50 in WG 125Pa High m LOW 15 0 r audible limit on continuous noise Approximate lt 2k 4k 8k Octave band center frequencies Hz External static pressure 0 80 in WG 200Pa 70 0 65 0 60 0 55 0 50 0 45 0 40 0 35 0 30 0 25 0 20 0 15 0 audible limit on continuous noise Approximate minimum 2k 4k 8k Octave band center frequencies Hz NC 60 NC 50 NC 40 NC 30 NC 20 NC 60 NC 50 NC 40 NC 30 NC 20 NC 60 NC 50 NC 40 NC 30 NC 20 MVZ A30AA4 External static pressure 0 30 in WG 75Pa 20uPa 20 0 Octave band pressure level dB 0dB 15 0 10 0 63 70 0 65 0 Approximate minimum audible limit on continuous noise 125 250 Octave band center frequencies Hz 2k 4k 8k External static pressure 0 50 in WG 125Pa 60 0 55 0 20 50 0 45 0 40 0 35 0 30 0 25 0 20 0 Octave band pressure level dB 048 Approximate minimum 15 0 audible limit on 22 continuous noise
6. Check outdoor fan motor Check operating condition of refrigerant circuit Defective outdoor fan control Overcharge of refrigerant Defective refrigerant circuit clogs Bypass circuit of outdoor unit is defective D Slight temperature difference between indoor room temperature and pipe liquid or condenser evaporator temperature thermistor Shortage of refrigerant 0 40 Check pipe liquid or condenser evaporator temperature with room temperature display on remote controller and outdoor controller circuit board Dis connected holder of ping Conduct temperature check with outdoor lt liquid or condenser evaporator gt thermistor e Defective refrigerant circuit Converse connection of extension pipe on plural units connection Converse wiring of indoor outdoor unit connecting wire on plural units connection Defective detection of indoor room temperature and pipe lt condenser evaporator gt temperature thermistor Stop valve is not opened completely controller circuit board after connecting A Control Service Tool PAC SK52ST 53 Check converse connection of extension pipe or converse wiring of indoor outdoor unit connecting wire 28 Abnormality of pipe temperature ther Defective thermistor 0 Check resistance value of thermistor mistor Condenser Evaporator TH5 characteristics For characteristics refer to P1 above D The unit is in th
7. Heating mode When 10 seconds have passed after the compressor starts operation and the hot adjustment mode has finished the unit is detected as abnormal when condenser evaporator pipe temperature is not in heating range within 20 minutes Note 3 It takes at least 27 minutes to detect abnormality Note 4 It excludes the period of defrosting Detection restarts when defrost ing mode is over Heating range deg C 5 4deg F 5 1 Cooling or drying mode D Clogged filter reduced airflow 2 Short cycle of air path 9 Low load low temperature operation beyond the tolerance range 2 Defective indoor fan motor Fan motor is defective Indoor controller board is defective Cooling or drying mode Check clogging of the filter 2 Remove shields Refer to 12 8 DC Fan motor FAN MOTOR INDOOR CONTROLLER BOARD Check outdoor fan motor Check operating condition of refrigerant circuit Defective outdoor fan control Overcharge of refrigerant Defective refrigerant circuit clogs Heating mode D Clogged filter reduced airflow Short cycle of air path Over load high temperature operation beyond the tolerance range Defective indoor fan motor e Fan motor is defective Indoor controller board is defective Heating mode D Check clogs of the filter Remove shields Refer to 12 8 DC Fan motor FAN MOTOR INDOOR CONTROLLER BOARD
8. 16 7 WIRING DIAGRAM MVZ A12 18 24 30 36AA4 RED he CN105 pe rb CN2A BLUE CN3C OFF CN41 ON RED CNER oo e005 60000 65 BLACK BLUE CN2C CN24 2 RED YELLOW CN20 CN24 1 Z BLUE 2 LED1 CN44 RED C CN2 OPTIONAL PARTS INSIDE SECTION OF CONTROL BO MODEL MVZ A12AA4 MVZ A18AA4 SWITCH TH2 TH5 TH1 SYMBOL NAME SYMBOL NAME Note1 Since the outdoor side electric wiring may change be sure INDOOR CONTROLLER BOARD INDOOR CONTROLLER BOARD CONNECTOR 0 10V ANALOG INPUT CONNECTOR EMERGENCY OPERATION CONNECTOR ERV OUTPUT POWER SUPPLY BOARD CONNECTOR LOSSNAY FUSE AC250V 6 3A X10 AUX RELAY CONNECTOR INPUT HUMIDITY INPUT TERMINAL BLOCK LED POWER SUPPLY INDOOR OUTDOOR CONNECTING LINE LED REMOTE CONTROLLER SUPPLY TERMINAL BLOCK LED TRANSMISSION INDOOR OUTDOOR RLY RADIO FREQUENCY INTERFACE FOR RF THERMOSTAT 17 LED RUN INDICATOR SWITCH HEATING ON OFF SWITCH COOLING ON OFF WIRED REMOTE CONTROLLER BOARD TERMINAL BLOCK REMOTE CONTROLLER TRANSMISSION LINE to check the outdoor unit electric wiring for servicing CONNECTOR HEATER CONTROL 1ST SWITCH FOR MODEL SELECTION
9. 0 90 200 0 80 175 0 70 150 0 60 125 0 50 100 0 40 75 0 30 Airflow rate m3 min cfm External static pressure 0 80 in WG 200Pa 208 230V 60Hz 2 19 20 671 706 30 1059 32 1130 Airflow rate m3 min cfm 10 e Downflow Static pressure Pa in WG Static pressure Pa in WG Static pressure Pa in WG External static pressure 0 30 in WG 75Pa 208 230V 60Hz SS E E 100 0 40 75 0 30 50 0 20 25 0 10 0 49 20 16711 706 25 883 Airflow rate m3 min cfm 30 1059 32 1130 0 70 150 0 60 125 0 50 100 0 40 75 0 30 50 0 20 25 0 10 19 20 6711 706 25 883 Airflow rate m3 min cfm 30 1059 32 1130 External static pressure 0 60 in WG 150Pa 208 230V 60Hz 0 80 175 0 70 150 0 60 125 0 50 100 0 40 75 0 30 50 0 20 19 20 25 30 32 671 706 883 1059 1130 Airflow m3 min cfm MVZ A12 18 24 30 36AA4 Air filter Power source 208 230V 60Hz 25 0 100 20 0 080 30 36 a 15 0 060 D A12 18 24 5 10 10 040 5 0 020 0 0 0 10 20 30 40 50 0 853 706 1
10. 125 250 2k 4k 8k Octave band center frequencies Hz External static pressure 0 80 in WG 200Pa 70 0 65 0 60 0 55 0 2 0 50 0 45 0 400 35 0 30 0 25 0 20 0 Octave band pressure level dB OdB Approximate minimum 15 0 L audible limit on continuous noise 13 125 250 2k 4k 8k Octave band center frequencies Hz 20uPa Octave band pressure level dB 0dB 20 Octave band pressure level dB OdB 20uPa Octave band pressure level dB 098 MVZ A36AA4 70 0 65 0 60 0 55 0 50 0 External static pressure 0 30 in WG 75Pa 45 0 F 40 0 35 0 30 0 25 0 20 0 15 0 10 0 70 0 65 0 60 0 55 0 50 0 45 0 40 0 35 0 30 0 25 0 r audible limit on 63 125 Approximate minimum continuous noise 250 500 1k 2k 4k 8k Octave band center frequencies Hz External static pressure 0 50 in WG 125Pa 20 0 15 0 10 0 70 0 65 0 60 0 55 0 50 0 45 0 40 0 35 0 30 0 25 0 20 0 15 0 10 0 r audible limit 222 continuous noise 63 125 250 500 1k 2k 4k 8k Octave band center frequencies Hz External static pressure 0 80 in WG 200Pa
11. 410 Use new refrigerant pipes In case of using the existing pipes for R22 be careful with the followings For A36 and A42 be sure to perform replacement oper ation before test run Change flare nut to the one provided with this product Use a newly flared pipe Avoid using thin pipes Make sure that the inside and outside of refrige rant piping is clean and it has no contamination such as sulfur hazardous for use oxides dirt shaving particles etc In addition use pipes with specified thickness Contamination inside refrigerant piping can cause deterio ration of refrigerant oil etc Store the piping to be used indoors during installation and both ends of the piping sealed until just before brazing Leave elbow joints etc in their packaging If dirt dust or moisture enters into refrigerant cycle that can cause deterioration of refrigerant oil or malfunction of com pressor Use ester oil ether oil or alkylbenzene oil small amount as the refrigerant oil applied to flares and flange connections If large amount of mineral oil enters that can cause deterio ration of refrigerant oil etc Charge refrigerant from liquid phase of gas cylinder If the refrigerant is charged from gas phase composition change may occur in refrigerant and the efficiency will be lowered 1 Cautions for service Do not use refrigerant other than R410A If other refrigerant R22 etc is used chlorine in
12. 50 0 20 amp 25 0 10 0 15 20 25 29 706 Airflow rate m3 min cfm External static pressure 0 50 in WG 125Pa 208 230V 60Hz 0 60 125 0 50 100 0 40 75 0 30 706 Airflow rate m3 min cfm External static pressure 0 80 in WG 200Pa 208 230V 60Hz 0 90 200 0 80 175 0 70 150 0 60 883 953 Airflow rate m3 min cfm MVZ A36AA4 Vertical Horizontal Right Horizontal Left Static pressure Pa in WG Static pressure Pa in WG Static pressure Pa in WG 7 0 30 50 0 20 0 1g 125 0 50 100 0 40 External static pressure 0 30 in WG 75Pa 208 230V 60Hz Re dice ee he ie ek uti S SY SURE SP SOS UE S 5 mic cec sic 20 671 706 25 883 Airflow rate m3 min cfm 30 1059 33 1165 External static pressure 0 50 in WG 125Pa 208 230V 60Hz 75 0 30 50 0 20 19 20 25 30 32 6711 706 883 1059 1130
13. MVZ A24AA4 Power supply phase cycle voltage 1 phase 60Hz 208 230V 45 4 Min Circuit Ampacity External finish Galvanized Steel Cabinet Powder coated Slate Gray Heat exchanger Plate fin coil Fan drive x No Fan motor output 0 121 Fan motor Operation control amp Thermostat Sound pressure level 75Pa 0 30 in WG 28 33 36 Low Mid High 50 in 30 34 38 34 38 42 Drain pipe Dimensions Weight Power supply_ phase cycle voltage External static pressure Sound pressure level 75Pa 0 30 in WG 30 34 38 Low Mid High i 32 36 40 35 39 43 Dimensions n mi Power supply phase cycle voltage External finish Heat exchanger Fan Operation control amp Thermostat Sound pressure level 75Pa 0 30 in WG 33 37 41 Low Mid High 125Pa 0 50 in WG dB A 35 39 43 37 41 45 Drain pipe Dimensions EMI D mm m 7777755 M INDOOR UNIT INDOOR UNIT INDOOR UNIT 4 FAN PERFORMANCE AND CORRECTED AIR FLOW 2 12 4 Vertical Horizontal Right Horizontal Left Static pressure Pa in WG Static pressure Pa in WG Static pressure Pa in WG 75 External static pressure 0 30 in WG 75Pa 208 230V 60Hz 0 30 50 0 20 0 7 10 14 353 494 Airflow rate m3 m
14. SWITCH AND JUMPER WIRE Each function is controlled by the dip switch and the jumper wire on control p c board SW1 and SW2 are equipped only for service parts Model setting and capacity setting are memorized in the nonvolatile memory of the control p c board of the unit Marks in the table below Jumper wire O Short X Open For service board SW1 Model settings MODELS MVZ A12AA4 SW2 MVZ A18AA4 Capacity settings MVZ A24AA4 MVZ A30AA4 MVZ A36AA4 Settings at time of factory shipment Wireless remote controller 0 Pair number Control PCB O for both J41 and J42 setting with Four pair number settings are supported wireless The pair number settings of the wireless remote remote 2 x controller and indoor control J41 J42 controller given in the table on the left x in the table indicates the jumper line is disco nnected Unit type There is no jumper JP1 because these models setting LWimouTHS O have the cond eva temperature thermistor TH5 Indoor controller Indoor controller board type board type Factory shipment setting Service parts 36 13 DISASSEMBLY PROCEDURE 1 Control box Exercise caution when removing heavy parts 1 Remove the Electric panel 2 screws 2 Remove the Control box cover 1 screw ELECTRICAL Fig 1 19 2 37 2 Thermistor Return Exercise caution when r
15. For description of each LED LED1 2 3 provided on the indoor controller refer to the following table LED 1 power for microcomputer Indicates whether control power is supplied Make sure that this LED is always lit LED 2 power for remote controller Indicates whether power is supplied to the remote controller This LED lights only in the case of the indoor unit which is connected to the outdoor unit refrigerant address LED 3 communication between indoor and outdoor units Indicates state of communication between the indoor and outdoor units Make sure that this LED is always blinking AUTO RESTART FUNCTION Indoor controller board This model is equipped with the AUTO RESTART FUNCTION When the indoor unit is controlled with the remote controller the operation mode set temperature and the fan speed are memorized by the indoor controller board The auto restart function sets to work the moment the power has restored after power failure then the unit will restart automatically Set the AUTO RESTART FUNCTION using the wireless remote controller Mode no 1 26 Note Refer the manual of outdoor unit the details of display 12 3 SELF DIAGNOSIS ACTION TABLE such as F U and other E 0 9 Check resistance value of thermistor OC 32 F 15 0kQ 10 C 50 F 9 6kQ 20 68 F 6 3kQ 30 C 86 F 4 3kQ 40 C 104 F 3 0kQ If you put force on draw or bend the lead wire wit
16. indoor outdoor unit connecting for connection failure wire e When is lit D Mis wiring of remote controller wires D Check the connection of remote con Under twin triple indoor unit system 2 or more indoor troller wires in case of twin triple indoor units are wired together unit system When 2 or more indoor units are wired in one refrigerant system connect remote controller wires to one of 2 Refrigerant address for outdoor unit is wrong or not those units set 2 Check the setting of refrigerant address Under grouping control system there are some units in case of grouping control system whose refrigerant address is O If there are some units whose refrigerant addresses 0 in one group set one of the units to O using SW1 3 6 on outdoor 3 Short cut of remote controller wires controller circuit board Defective remote controller 30 Remove remote controller wires and check LED2 on indoor controller board When LED is blinking check the short cut of remote controller wires When LED is lit connect remote controller wires again and if LED2 is blinking remote controller is defective if LED2 is lit connection failure of remote controller terminal block etc has returned to normal 31 12 5 TEST POINT DIAGRAM 12 5 1 Power supply board MVZ A12AA4 MVZ A18AA4 MVZ A24AA4 MVZ A30AA4 MVZ A36AA4 p t A 7 O ni 20 AOL n 7 4
17. remote controller Beeper sounds OPERATION Symptom INDICATOR lamp flashes Check code Number of times 9 Indoor utdoor unit communication error Transmitting error Outdoor unit or Compressor overcurentinteruption 3 of outdoor unit rT Compressor overcurrentinterupion When compressor locked discharging tempersturelSO worked inefficient efigerant 6 Abnormal high pressure 63H worked Overheating safeguard operation Abnormal temperature of heat sink For details check the LED 78 us tor uit fen protection stop cay of tne outdoor controller Poss Compressor overcurrent interruption Abnormal of power module board G 11 09 synchronous signal to main circuit Current sensor error 14848 1 y O 1 If the beeper does not sound again after the initial two beeps to confirm the self check start signal was received and the OPERATION INDICATOR lamp does come on there are no error records 2 If the beeper sounds three times continuously 0 4 0 4 0 4 sec after the initial two beeps to confirm the self check start signal was received the specified refrigerant address is incorrect On IR wireless remote controller The continuous buzzer sounds from receiving section of indoor unit Blink of operation lamp On wired remote
18. 059 1412 1766 Airflow rate m3 min cfm 11 5 SOUND PRESSURE LEVELS 5 1 Sound pressure level Ceiling concealed Front side 3 1 4ft 5 2 NC curves 2 12 4 20 Octave band pressure level dB OdB 20 Octave band pressure level dB OdB 20 Octave band pressure level dB OdB External static pressure 0 30 in WG 75 Approximate minimum Nc o 22 audible limit on s FE continuous noise Tu 100 ee 63 125 250 500 1k 2k 4k 8k Octave band center frequencies Hz T External static pressure 0 50 in WG 125Pa RE High 65 0 Middle 60 0 55 0 50 0 45 0 40 0 35 0 30 0 25 0 20 0 15 0 audible limit on t z continuous noise E 10 0 63 125 250 500 1k 2k 4k 8k Octave band center frequencies Hz External static pressure 0 80 in WG 200Pa s sss 21 High wm wm r audible L continuous noise 63 125 250 500 1 2k 4k 8k Octave band center frequencies Hz NC 60 NC 50 NC 40 NC 30 NC 20 NC 60 NC 50 NC 40 NC 30 NC 20 NC 60 NC 50 NC 40 NC 30 NC 20 Measurement location MVZ A18AA4
19. 12 20uPa Octave band pressure level dB 098 20yPa Octave band pressure level dB 098 20yPa Octave band pressure level dB 038 70 0 65 0 60 0 55 0 50 0 45 0 40 0 35 0 30 0 25 0 20 0 70 0 65 0 60 0 55 0 50 0 45 0 40 0 35 0 30 0 10 0 External static pressure 0 30 in WG 75Pa 111 Approximate minimum audible limit on continuous noise 250 500 1k 2k Octave band center frequencies Hz External static pressure 0 50 in WG 125Pa audible limit on Approximate minimum 22 continuous noise 250 500 1k 2k Octave band center frequencies Hz External static pressure 0 80 in WG 200Pa 63 z Approximate minimum audible limit on continuous noise 125 250 500 1k 2k Octave band center frequencies Hz NC 60 NC 50 NC 40 NC 30 NC 20 NC 60 NC 50 NC 40 NC 30 NC 20 NC 60 NC 50 NC 40 NC 30 NC 20 20 Octave band pressure level dB OdB 20yPa Octave band pressure level dB OdB 20yPa Octave band pressure level dB OdB MVZ A24AAA 70 0 External static pressure 0 30 in WG 75Pa 65 0 60 0 55 0 50 0 45 0 40 0 35 0 30 0 25 0 20 0
20. HOOTING BY INFERIOR Note Refer to the manual of outdoor unit for the detail of remote controller Phenomena Cause Countermeasure 1 LED2 on indoor controller board When LED1 on indoor controller board is also off 15 off Power supply of rated voltage is not supplied to out Check the voltage of outdoor power door unit supply terminal block L N or Ls N e When AC 208 230 is not detected Check the power wiring to outdoor unit and the breaker When AC 208 230 is detected 2 below 2 Defective outdoor controller circuit board 2 Check the voltage between outdoor terminal block 51 and S2 e When AC 208 230V is not detected Check the fuse on outdoor controller circuit board Check the wiring connection When AC 208 230 is detected Check below 9 Power supply of 208 230V is not supplied to indoor Check the voltage between indoor terminal unit block S1 and S2 e When AC 208 230V is not detected Check indoor outdoor unit connecting wire for mis wiring When AC 208 230 is detected 2 below 2 Defective indoor controller board 4 Check the fuse on indoor controller board Check the wiring connection If no problem are found indoor controller board is defective 2 LED2 on indoor controller board When LED1 on indoor controller board is also blinking Check indoor outdoor unit connecting wire is blinking Connection failure of
21. IR WIRELESS REMOTE CONTROLLER BOARD 2 Indoor and outdoor connecting wires are made with CONNECTOR HEATER CONTROL 2ND SWITCH FOR CAPACITY CODE RECEIVING UNIT polarities make wiring matching terminal numbers CONNECTOR HUMIDITY OUTPUT SWITCH FOR MODE SELECTION BUZZER 51 52 53 3 Symbols used in wiring diagram above are as follows CONNECTOR TERMINAL HEAVY DOTTED LINE FIELD WIRING THIN DOTTED LINE OPTIONAL PARTS 4 Use copper supply wire UTILISER DES FILS D ALIMENTATION EN CUIVRE REFRIGERANT SYSTEM DIAGRAM MVZ A12 18 24 30 36AA4 Strainer 50 Heat exchanger Refrigerant GAS pipe connection Flare Thermistor TH5 Cond Eva temperature Refrigerant flow in cooling Refrigerant flow in heating Refrigerant LIQUID pipe connection ag Flare Thermistor TH2 Pipe temperature Liquid L Thermistor TH1 Room temperature Distributor Strainer with strainer 50 18 9 HEATER CONTROL 9 1 CONTROL SPECIFICATIONS AND FUNCTION SETTING Table 1 shows how the field installed heater is controlled Select the desired pattern in the table below and set the Function on the indoor units as shown in Table 1 Table 1 Function table Select unit numbers 01 to 03 or all units AL wired remote controller 07 IR wireless remote controller Mode Setting Mode function No Initial setting Wired remote controller RF thermostat Heater OFF 1 Inlet
22. MITSUBISHI Changes for the Better a ELECTRIC SPLIT TYPE HEAT PUMP AIR CONDITIONERS 201 5 R410A SERVICE MANUAL Series MVZ Model name Indoor unit MVZ A12AA4 MVZ A18AA4 MVZ A24AAA MVZ A30AA4 MVZ A36AA4 INDOOR UNIT SLIM CONTENTS SAFETY PRECAUTION 2 2 PART NAMES AND FUNCTIONS In 3 2 4 4 FAN PERFORMANCE AND CORRECTED AIR FLOW 6 5 SOUND PRESSURE LEVELS pF 12 6 OUTLINES amp DIMENSIONS etre eon aues aeuo um 15 7 WIRING DIAGRAM 17 3 REFRIGERANT SYSTEM DIAGRAM 2220220 18 9 oe ese En aa ieu 19 10 BUMIDIEIER CONTROL 2 intel 22 11 ERV ENERGY RECOVERY VENTILATION 23 12 Ha una ass cO Edu 24 13 DISASSEMBLY PROCEDURE een MIHI 37 1 SAFETY PRECAUTION 1 1 ALWAYS OBSERVE FOR SAFETY Before obtaining access to terminal all supply circuits must be disconnected 1 2 CAUTIONS RELATED TO NEW REFRIGERANT Cautions for units utilising refrigerant
23. O S elem E pres s S 75 0 30 Felis pam due 50 0 20 25 0 10 0 43 15 20 24 706 847 Airflow rate m3 min cfm External static pressure 0 50 in WG 125Pa 208 230V 60Hz 150 7 0 60 100 0 40 75 0 30 4 0 10 13 15 20 24 459 530 706 847 Airflow rate m3 min cfm x External static pressure 0 80 in WG 200Pa 208 230V 60Hz 5 r r r r 0 90 200 0 80 175 0 70 150 0 60 Airflow m3 min cfm MVZ A30AA4 Vertical Horizontal Right Horizontal Left Static pressure Pa in WG Static pressure Pa in WG Static pressure Pa in WG External static pressure 0 30 in WG 75Pa 208 230V 60Hz 100 0 40 0 15 20 25 29 706 Airflow rate m3 min cfm External static pressure 0 50 in WG 125Pa 208 230V 60Hz 4 0 60 125 0 50 100 0 40 75 0 30 20 25 29 706 Airflow rate m3 min cfm e Downflow Static pressure Pa in WG Static pressure Pa in WG Static pressure Pa in WG External static pressure 0 30 in WG 75Pa 208 230V 60Hz 0 40 WM WO ME lt NE 75 0 30
24. air temp 2 set temp Heater ON Inlet air temp set temp 4 5 F 2 5 C fan will stop and the heater will turn off when DEFROST or ERROR is displayed Set temp Room temperature setting Set temp 1 8F 1C Set temp 4 5F 2 5C ON OFF 2 1 O Heater OFF Inlet air temp gt set temp Heater ON Inlet air temp set temp 1 8 F 1 C The fan will stop and the heater will turn off when DEFROST is displayed Heater Enable heater control basic control Enable heater comfort mode Set temp Inlet air temp Room temperature setting i Set temp 1 8F 1C Heater output ON OFF Enable heater economy mode Heater OFF 2 2 Inlet air temp gt set temp 1 8 F 1 C Heater ON Inlet air temp set temp 3 6 F 2 C fan will stop and the heater will turn off when DEFROST is displayed Set temp Room temperature setting Set temp 1 8F 1C Set temp 3 6F 2C ON OFF Inlet air temp set temp 1 8 F 1 C Heater ON Inlet air temp set temp 4 5 F 2 5 C The fan will stop and the heater will turn off when DEFROST is displayed Set temp Room temperature setting Inlet air temp Set temp 1 8F 1C Set temp 4 5F 2 5C Heater output ON ___ 1st Heater output from CN24 1 yellow the indoor unit control board 2nd Heater output from CN24 2 blue on the indoor unit control board Refer to the Installation Manual for functio
25. art stop adapter CN22 For remote controller cable con nection 10 13 VDC CN51 Centralized control CN41 JAMA standard HA terminal 44 Thermistor liquid condenser evaporator temperature CN4F Float sensor 20 Thermistor Inlet temperature CN24 1 1st Heater control 12VDC CN24 2 2nd Heater control For fan control Indoor outdoor transmission 0 24VDC 90 Wireless remote controller CNXA2 Connect to the indoor controller board CNXB2 Connect to the indoor controller board CNXC2 Connect to the indoor controller board CNXA1 Connect to the indoor power board CNXB1 Connect to the indoor power board CNXC1 Connect to the indoor power board CNER ERV controll CN2C ERV input CN25 Humidity conrol CNF Humidity input n 12 6 TROUBLE CRITERION OF MAIN PARTS MVZ A12AA4 MVZ A18AA4 MVZ A24AA4 MVZ A30AA4 MVZ A36AA4 Part name Check method and criterion Room temperature Measure the resistance with a tester Part temperature 10 C 50 F 30 C 86 F temperature e thermistor liquid 4 3kQ 9 6kQ Opened or short circuited TH2 Condenser evaporator temperature thermistor 5 Wiring diagram Vm Power supply for motor Vcc Power supply for control Vsp Speed command voltage PG Pulse output for rotation 12 7 Thermistor lt Thermistor Characteristic graph gt THSUNIEIOEISE temperature thermist
26. ck the indoor outdoor connecting wire for mis wiring 2 Take care the followings during servicing D Before servicing the air conditioner be sure to turn off the remote controller first to stop the main unit and then turn off the breaker 2 When removing the indoor controller board hold the edge of the board with care NOT to apply stress on the components When connecting or disconnecting the connectors hold the housing of the connector DO NOT pull the lead wires X O roe Lead wires Housing point 24 12 2 SELF CHECK FUNCTION Refer to the installation manual that comes with each remote controller for details e RF thermostat is not established Output pattern A Errors detected by indoor unit Wired remote controller Beeper sounds OPERATION symptom Remark INDICATOR lamp flashes Check code Number of times P1 intake sensor error 000000000021 P2 P9 Pipe Liquid or 2 phase pipe sensor error E6 E7 Indoor outdoor unit communication error VEU VEU Pa Dmisemoremr _ Pe Freezing Overheating EE Communication error between indoor and ouidooruns P amp Pmetempreemr O 7 r SSCS 8782 7772 n c rr 12 Indoor unit control system error memory error etc No sound No corresponding 22271 Output pattern detected unit other than indoor unit outdoor unit etc Wired
27. controller Check code displayed on the LCD 10 f the unit cannot be operated properly after the above test run has been performed refer to the following table to remove the cause Symptom Wired remote controller LED 1 2 PCB in outdoor unit After LED 1 2 are lighted LED 2 is turned e For about 2 minutes after power on operation of the For about 2 minutes PLEASE WAIT off then only LED 1 is lighted Correct remote controller is not possible due to system start up following power on operation Correct operation e Connector for the outdoor unit s protection device is not connected PLEASEANAN Aner abaut a mm Only LED 1 is lighted gt LED 1 2 blink Reverse or open phase wiring for the outdoor power utes has expired terminal block L1 L2 L3 Display messages do not appear died g following power on Incorrect wiring between indoor and outdoor units even when operation switch is Only LED 1 is lighted LED 1 2 blinks incorrect polarity of 51 52 53 twice LED 2 blinks once e Remote controller wire Hn not light up On the IR wireless remote controller with conditions above following phenomena takes place No signals from the remote controller are accepted OPE lamp is blinking The buzzer makes a short ping sound Note Operation is not possible for about 30 seconds after cancellation of function selection Correct operation 25
28. d v e Ler uonoeuuoo 900 0 56 6 dol pee 5 9 lt Ee z 8 9 1 8 9 gt 9 9882 uonejeis uoissiuisueJ J9 OJju09 928 1e BOUBUSIUIEWW 10 4 eolAJes eui deay SION e Lldd v vie tad 619 edid uleip lt V E LIEV uoissiusueJ 04107 IeluozuoH FY 1 Ldd v 2 950 612 Q O ules IACI Alo G 6 7 2 90 619 5 o edid 8 Inbi uonoeuuoo pulze 1n0X90UM 920 idi Buidid seb uonoeuuoo 2 ul 16 10 9 po z uonoeuuoo yun 1oopu 928 15 Jo 2 9 609 2 9 609 uonejeisu HUF JO
29. door that covers the small enclosure attached to the fan assembly Fig 12 Unplug the motor and route the wire harness out of the enclosure 4 Remove the 2 screws that secure the fan assembly and slide out 41 MITSUBISHI ELECTRIC CORPORATION http Global MitsubishiElectric com New publication effective Feb 2015 HWE1407A Specifications subject to change without notice
30. emoving heavy parts 1 Remove the Filter panel 2 thumbscrews 2 Remove the Blower panel 2 screws 3 Remove the cover over the Return Air thermistor box and unplug the thermistor 4 Pull out the thermistor holder and thermistor inside the box 38 3 Coil Assembly Exercise caution when removing heavy parts 1 Remove the Electrical Blower and Filter panel indicated in sections 1 and 2 2 Remove the Coil panel by removing all of the screws securing it to the 3 smaller panels for refrigerant and drain lines 3 Slide the smaller panels in the directions indicated and remove gt bD 7 Pp gt a Fig 6 4 Remove the 1 or 2 brackets that secure the coil unplug the ther mistors from the control board and route the wires out of the control box area and into the coil section Next slide the coil from the frame css Y 5 Remove the plate covering the coil assembly to access the thermistors AX 3 gt G 455 2 i NU y DETAIL B DETAIL A Fig 9 6 Remove lower and side drain pan Fig 10 40 4 Blower Fan Assembly Exercise caution when removing heavy parts 1 Remove the Blower and Filter panel along with filter if installed indicated section 2 2 Remove the 1 or 2 brackets that secure the coil assembly Fig 11 3 Remove the
31. gth of the electrical wiring for the PAC YU25HT is 2 meters 6 1 2 ft To extend this length use sheathed 2 core cable Control cable type CVV CVS CPEV or equivalent Cable size 0 5 mm 1 25 mm 16 to 22 AWG Don t extend the cable more than 10 meters 32ft Recommended circuit FS H1 1 phase 3 LLL power supply 88H FS2 H2 208V 230V 60Hz E nr Wiring diagram S 21 251 2 Thermal fuse 88H FS2 H1 H2 Heater 26H T 88H 26 Overheat C protection thermostat Control board 88H Electromagnetic contactor CN24 1 or CN24 2 4 Wiring restrictions Keep the length of the cable connecting to the circuit board of the indoor unit shorter than 10 meters 328 Longer than 10 meters 32ft could cause improper operation Use a transit relay when extending wiring such as remote wiring 21 10 1 CONTROL SPECIFICATIONS The below table shows how the field installed humidifier and fan speed is controlled Mode Mode function No No Mode function No Humidistat Condition no defrost no error CN25 output Fan speed Wired remote controller Output RF thermostat 13 113 113 16 116 16 116 CNFinput OFF Heat operation amp Thermo OFF _ operation amp Thermo OFF OFF RC setting operation amp setting a amp The
32. h measuring resistance value of thermistor breaking of wire or contact failure can be detected Room temperature 7 Defective thermistor thermistor TH1 characteristics D The unit is in three minute resume 2 Contact failure of connector prevention mode if short open of CN20 on the indoor controller thermistor is detected Abnormal if the board Insert failure unit does not reset normally after three Breaking of wire or contact minutes The unit returns to normal failure of thermistor wiring operation if it has normally reset 4 Defective indoor controller Constantly detected during cooling board drying and heating operation Short 90 C 194 F or more Open 40 C 40 F or less 2 Check contact failure of connector CN20 on the indoor controller board Refer to 12 5 P1 Turn the power on again and check restart after inserting connector again 2 Check room temperature display on remote controller Replace indoor controller board if there is abnormal difference with actual room temperature Turn the power off and on again to operate after check Pipe temperature Defective thermistor 0 Check resistance value of thermistor thermistor Liquid TH2 characteristics For characteristics refer to P1 above The unit is in three minute resume 2 Contact failure of connector 2 Check contact failure of connector CN44 on prevention mode if short open of 44 on the indoor controller the indoor con
33. he fuse blow Yes gt Wiring contact check Contact of fan motor connector CNMF Replace drain pump DP Is there no contact failure gt gt Yes Measure voltage the indoor controller circuit board TEST POINT between 1 and 3 of the fan connector DC310 340V TEST POINT Vcc between 4 and 3 of the fan connector Vcc DC15V V Is the voltage normal gt Yes gt Measure the resistance of the fan motor Replace indoor Is the resistance of the fan motor No controller board normal Refer to below table OK Yes Check the operation gt END Does fan motor rotate smoothly Yes connect the connector CNMF Turn ON the power supply and 2 the fan motor measure the voltage of connector CNMF while rotaing the motor by the hand v Does the voltage between pin 6 and pin 3 gt No gt Replace the fan motor of connector CNMF repeat 0V and 5V Ves OK VYes OK Check the operation of fan Check the operation of fan Replace indoor controller board Replace indoor controller board To measure the resistance connect the negative end of the tester to pin 3 35 12 9 FUNCTIONS
34. in cfm External static pressure 0 50 in WG 125Pa 208 230V 60Hz 125 0 50 100 0 40 10 14 353 494 Airflow rate m3 min cfm 0 90 External static pressure 0 80 in WG 200Pa 208 230V 60Hz 7 200 0 80 175 0 70 150 0 60 Airflow rate m3 min cfm e Downflow Static pressure Pa in WG Static pressure Pa in WG Static pressure Pa in WG 75 External static pressure 0 30 in WG 75Pa 208 230V 60Hz m dies 0 30 50 0 20 25 0 10 9 7 i 353 0 14 494 Airflow rate m3 min cfm External static pressure 0 50 in WG 125Pa 208 230V 60Hz 0 60 peus s 125 7 0 50 100 0 40 75 0 30 50 0 20 Airflow 10 14 353 494 rate m3 min cfm 0 90 sa Bess External static pressure 0 80 in WG 200 208 230 60Hz a hasa A ha 1 1 m
35. ith the air conditioner 1 Parts list Check that the following parts are included in the package 1 External output cable with a yellow connector 2 in total Two types of cables with different connectors are included 2 Panel heater nne 3 in total White 1 Green 2 2 types Panel heater connectors cannot be used with this unit 2 Connection to the indoor unit Use the cables that fit the connectors on the indoor unit control board 1 External output cable with a yellow connector This cable is used to connect a relay circuit for an interlocked operation with either an electric or a panel heater Select the heater output pattern 1st CN24 1 or 2nd CN24 2 to use and connect the cable to the connector on the indoor unit control board that corresponds to the selection 20 3 Locally wiring basic connection method is shown below Indoor unit Remote control board Relay circuit Adapter control board cum eae ere me T l CN24 1 or CN24 2 I I LI Electric Heater power source Electric Heater or panel heater E Preparations in the field Maximum cable length is 10 m 32ft For relay X use the specifications given below Operation coil Rated voltage 12VDC Power consumption 0 9W or less Use the diode that is recommended by the relay manufacturer at both ends of the relay coil len
36. ller board receives trans board bs 2 5 mitted data at the same time compares Noise has entered into trans I d b When RC NG is displayed replace remote controller troller c When RC E3 or ERC 00 66 is displayed noise may be causing abnormality the data and when detecting it judges mission wire of remote con different data to be abnormal 30 continuous times Error code E5 29 Indoor outdoor unit communication Contact failure short circuit or Check LED display on the outdoor control cir error Signal receiving error mis wiring converse wiring of cuit board Connect A control service tool 0 Abnormal if indoor controller board indoor outdoor unit connecting 5 525 cannot receive signal normally for wire Refer to EA EC item if LED displays EA EC six minutes after turning the power on T D Check disconnection or looseness of indoor Abnormal if indoor controller board Defective transmitting receiving unit connecting wire of indoor unit or cannot receive any signal normally for circuit of indoor controller board outdoor unit three minutes 9 Defective transmitting receiving Check all the units in case of twin triple 9 Consider the unit as abnormal under the circuit of indoor controller board indoor unit system following condition When two or more 2 Noise has entered into indoor Turn the power off and on again
37. n not receive normally any as sub remote controller In If there is no problem with the action above transmission from indoor unit of refriger this case EO is displayed on Check of ones coniraner ant address 0 for three minutes remote controller and E4 is 22 n disp ayea al LED The number of connecting indoor units 2 Abnormal if sub remote controller could on the outdoor controller circuit m x 16unite not receive for any signal for two min board number of connecting remote con utes Error code EO 9 Mis wiring of remote controller troller max 2units 2 Defective transmitting receiving Abnormal if indoor controller board can circuit of remote controller When it is not the above mentioned problem of not receive normally any data from Defective transmitting receiving D G remote controller board or from other circuit of indoor controller board Diagnose remote controllers or indoor controller board for three minutes refrigerant address 0 a When RC is displayed E4 Error code E4 8 Noise has entered into the Remote controllers have no problem Indoor controller board cannot receive transmission wire of remote Turn the power off and on again to check If abnormality generates again replace any signal from remote controller for two controller indoor controller board minutes Error code E4 b When is displayed
38. n settings 2nd Heater OFF Inlet air temp gt set temp Heater ON Inlet air temp set temp 2 7 F 1 5 C The fan will stop and the heater will turn off when DEFROST is displayed Set temp Room temperature setting Inlet air temp Set temp 1 8F 1C Settemp 2 7F 1 5C Heater output 19 mm 9 2 FAN CONTROL By setting the Mode No 23 in the Function Table in section 9 1 the following patterns of fan control will become possible Fan control patterns for FAN control Mode function Fan in defrost Fan All modes other Factory PAC YU25HT No 23 123 than defrost setting Disabled STOP Heater OFF Set Heater ON CN4Y cannot be used with this unit STOP Heater OFF High Heater 1 While the heater is on the fan will operate at high speed regardless of the fan setting on the remote controller 2 While the heater output is on in the Function Table in section 9 1 the heater will be ON except when the unit is in communication error return air thermistor error and motor error AN f a heater is installed in the duct do not use Panel heater connector By doing so the fan will turn off when the heater is on which may result in fire 9 3 PAC YU25HT OPTIONAL PARTS INSTALLATION The following section describes installation of the External Heater Adapter that connects to MVZ A AA4 series indoor unit This products is the special wiring parts to drive an electric heater w
39. nal static pressure 0 80 in WG 200Pa 208 230V 60Hz ccce de T Static pressure Pa in WG Airflow rate m3 min cfm MVZ A24AAA Vertical Horizontal Right Horizontal Left Static pressure Pa in WG Static pressure Pa in WG Static pressure Pa in WG External static pressure 0 30 in WG 75Pa 208 230V 60Hz 75 0 30 50 0 20 0 43 15 20 24 706 847 Airflow rate m3 min cfm External static pressure 0 50 in WG 125Pa 208 230V 60Hz Mer RR e a Seats p aa aa ace ee Tua P S e E ED a nee ee EA 125 0 50 Serada eese puse ee porcum noe SLT cM Bones ede Bes ee SS oo eS euam 100 0 40 75 0 30 50 0 20 44 459 15 20 24 530 706 Airflow rate m3 min cfm 847 External static pressure 0 80 in WG 200Pa 208 230V 60Hz NOE med ee QUEM NN 0 90 200 0 80 175 0 70 150 0 60 Airflow rate m3 min cfm e Downflow Static pressure Pa in WG Static pressure Pa in WG Static pressure Pa in WG External static pressure 0 30 in WG 75Pa 208 230V 60Hz cun eumd es mmu monde com eee
40. or TH1 Pipe temperature thermistor TH2 Condenser evaporator temperature thermistor TH5 Thermistor for lower temperature gt 9 Thermistor 15 3 Fixed number of 3480 2 1 1 15 3480 27341 273 09 15 109 9 6 20 6 3 25 5 2 kQ 3 20 10 0 10 20 30 40 50 30 4 3 4 14 32 50 68 86 104122 F 40 104 F 3 0 Temperature O gt 2 0 34 12 8 DC MOTOR MOTOR INDOOR CONTROLLER BOARD Check method of DC fan motor fan motor indoor controller circuit board D Notes High voltage is applied to the connecter CNMF for the fan motor Give attention to the service Do not pull out the connector for the motor with the power supply on It causes trouble of the indoor controller circuit board and fan motor 2 Self check Symptom The indoor fan cannot turn around Check the fuse FUSE on indoor controller board Check the drain pump DP Is the resistance between terminals normal Replace indoor controller board fan motor MF Did t
41. ree minute resume pro Contact failure of connector 2 Check contact failure of connector 44 tection mode if short open of thermistor 44 on the indoor controller the indoor controller board is detected Abnormal if the unit does board Insert failure Refer to 12 5 not get back to normal within three min Breaking of wire or contact 1 restart after utes The failure of thermistor Ag 4 Operate in test run mode and check pipe tion if It has normally reset Temperature of thermistor is condenser evaporator temperature Constantly detected during cooling dry 90 C 194 F or more If pipe condenser evaporator tempera ing and heating operation except 40 40 F or less caused by is extremely low in cooling mode or defrosting defective refrigerant circuit high in heating mode refrigerant circuit Short 90 C 194 F or more Defective indoor controller may have defect Open 40 C 40 F or less board When no problems are found 0 4 above replace the indoor unit control board Remote controller transmission D Contact failure at transmission D Check disconnection or looseness of indoor error E0 signal receiving error E4 wire of remote controller unit or transmission wire of remote controller Abnormal if main or sub remote All remote controllers are set Set one of the remote controllers main troller ca
42. refrige rant can cause deterioration of refrigerant oil etc 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 Use the following tools specifically designed for use with R410A refrigerant The following tools are necessary to use R410A refrigerant Torque wrench Electronic refrigerant charging scale Handle tools with care If dirt dust or moisture enters into refrigerant cycle that can cause deterioration of refrigerant 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 Ventilate the room if refrigerant leaks during operation If refrigerant comes into contact with a flame poisonous gases will be released 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 2 Additional refrigerant charge When charging directly from cylinder Check that cylinder for R410A on the market is syphon type Charging should be performed with the cylinder of syphon stood vertically Refrigerant is charged from liquid pha
43. rmo Heat operation 8 Thermo ON High m NNNM sis The fan continues to run for 30 seconds after the humidifier stops 10 2 INSTALLATION A basic connection method is shown below Humidifier Indoor unit control board power source Humidifier Humidistat On site preparation Use relay having following specifications Maximum cable length is 10m 32ft Rated voltage 12VDC Power consumption 1W or less Humidistat Minimum applicable load 1mA at DC Contact rating voltage 15VDC or more Contact rating current 0 1A or more 22 11 ERV ENERGY RECOVERY VENTILATION CONTROL 11 1 CONTROL SPECIFICATIONS The below table shows how the field installed ERV is controlled ERV output Condition Fan speed CN2C output CNER input Fan output LL Cool Heat Fan operation RC setting STOP OFF Defrot 00 11 2 INSTALLATION A basic connection method is shown below Indoor unit control board power source ERV d ERV switch On site preparation Maximum cable length is 10m 32ft Use XB relay having following specifications Rated voltage 12VDC Power consumption 1W or less ERV switch Minimum applicable load 1mA at DC Contact rating voltage 15VDC or more Contact rating current 0 1A or more 23 12 TROUBLESHOOTING 12 1 CAUTIONS ON TROUBLESHOOTING 1 Before troubleshooting check the followings Check the power supply voltage 2 Che
44. se 3 Service tools Use the below service tools as exclusive tools for R410A refrigerant Gauge manifold Only for R410A Use the existing fitting specifications UNF 1 2 Use high tension side pressure of 5 3MPa G or over Charge hose Only R410A Use pressure performance of 5 09MPa G or over Refrigerant cylinder Only for 410 Top of cylinder Pink Cylinder with syphon 2 PART NAMES AND FUNCTIONS e Indoor Unit 1 Vertical 2 Horizontal Right Air outlet Air inlet 3 Horizontal left 4 Down flow Air inlet Air inlet Air outlet SPECIFICATION Service Ref MVZ A12AA4 Power supply phase cycle voltage 1 phase 6 2 208 230V 15 Min Circuit Ampacity 3 00 External finish Galvanized steel cabinet Powder coated Slate Gray Heat exchanger Plate fin coil External static pressure Sound pressure level 75Pa 0 30 in WG 24 28 32 Low Mid High 125Pa 0 50 in WG dB A 27 31 35 200Pa 0 80 in WG 32 36 41 Dimensions Win ese OOOO D mi 5480158 H mm n 564 0 2 INDOOR UNIT kg ibs Power supply phase cycle voltage External static pressure Sound pressure level 75Pa 0 30 in WG 26 30 34 Low Mid High 125Pa 0 50 in WG dB A 28 32 36 200Pa 0 80 in WG 33 37 41 19 05 3 4 Dimensions mm n 12 CCC C 1 Em 50 1 4 1 113 INDOOR UNIT Service
45. to check indoor units are connected to an outdoor unit connecting wire If abnormality generates again replace outdoor unit indoor controller board indoor controller board or outdoor cannot receive a signal for three minutes controller circuit board from outdoor controller circuit board a Other indoor controller board may have signal which allows outdoor controller defect in case of twin triple indoor unit circuit board to transmit signals system Indoor outdoor unit communication D Defective transmitting receiving 0 8 Turn the power off and on again to check error Transmitting error circuit of indoor controller board If abnormality generates again replace Abnormal if 1 receiving is detected 30 Noise has entered into power indoor controller board times continuously though indoor controller supply board has transmitted O Noise has entered into outdoor control wire Indoor controller board D Defective indoor controller Replace indoor controller board Abnormal if data cannot be read normally board from the nonvolatile memory of the indoor controller board Remote controller control board Defective remote controller Replace remote controller Abnormal if data cannot be read normal ly from the nonvolatile memory of the remote controller control board Error code E1 2 Abnormal if the clock function of remote controller cannot be operated normally Error code E2 30 12 4 TROUBLES
46. troller Operate with connector CN4F short circuited Constantly detected during operation board Refer to 12 5 Replace indoor controller board if abnormality reappears P4 5701 27 Freezing overheating protection is working Freezing protection Cooling mode The unit is in six minute resume prevention mode if pipe liquid or condenser evap orator temperature stays under 15 5 for three minutes after the compressor started Abnormal if it stays under 15 C 5 for three minutes again within 16 minutes after six minute resume prevention mode 2 Overheating protection Heating mode The units is in six minute resume prevention mode if pipe Liquid or con denser evaporator temperature is detected as over 70 158 F after the compressor started Abnormal if the temperature of over 70 158 F is detected again within 10 minutes after six minute resume prevention mode Pipe temperature Cooling mode Detected as abnormal when the pipe tem perature is not in the cooling range 3 min utes after compressor start and 6 minutes after the liquid or condenser evaporator pipe is out of cooling range Note 1 It takes at least 9 minutes to detect Note 2 Abnormality P8 is not detected in drying mode Cooling range 3 deg C 5 4deg F 1 TH Lower temperature between liquid pipe temperature TH2 and con denser evaporator temperature TH5 TH1 Intake temperature
47. troller board Refer to 12 5 thermistor is detected Abnormal if the board Insert failure Turn the power on again and check restart unit does not reset normally after three Breaking of wire or contact after inserting connector again minutes The unit returns to normal failure of thermistor wiring Check pipe liquid temperature with remote operation if it has normally reset Defective refrigerant circuit is controller in test run mode If pipe liquid 2 Constantly detected during cooling causing thermistor temperature temperature is extremely low in cooling drying and heating except defrosting of 90 C 194 F or more mode or high in heating mode refrigerant operation 40 C 40 F or less circuit may have defective po Short 90 C 194 F or more Defective indoor controller board Check pipe liquid temperature with remote Open 40 C 40 F or less controller in test run mode If there is extreme difference with actual pipe lt liquid gt temperature replace indoor controller board Turn the power off and on again to operate after check Contact failure of drain float switch CN4F Contact failure of connector D Check contact failure of float switch connec Extract when the connector of drain float Insert failure tor switch is disconnected Turn the power on again and check after of connector is not inserting connector again short circuited 2 Defective indoor con

SERVICE MANUAL

Contents

Download Pdf Manuals

Related Search

Related Contents