TECHNICAL & SERVICE MANUAL
Contents
1. SEZ KD18NA 4 External static pressure 0 06 in WG 15Pa 0 0002 ubar SEZ KD18NA 4 External static pressure 0 20 in WG 50Pa 0 0002 ubar 90 VY ze V H 20 ES ES OF HEARING FOR R JE NC 2 SEEN LIT EE w s mim Va P p U Jd 500 1000 2000 BAND CENTER FREQUENCIES Hz 4000 8000 RE M 70 z Q N e 60 ss NY o e FIM 50 40 30 20 2 Q o I cw nnam UI aa D e eo PNG TERESHOLD OF HEARING FOR E N NE 10 CENE J 250 500 BAND CENTER FREQUENCIES Hz P mw z N MNA NE 1000 2000 4000 8000 NOTE The sound level is measured in an anechoic room where echoes are few when compressor stops The sound may be bigger than displayed level under actual installation condition by surrounding echoes The sound level can be higher by about 2 dB than the displayed level during cooling and heating operation INDOOR FAN PERFORMANCE AND CORRECTED AIR FLOW SEZ KDO9NA 4 5 2 9 4 External static pressure 0 02 in WG 5Pa 208 230V 60Hz External static pressure 0 06 in WG 15Pa 208 230V 60Hz 40 0 16 30 0 12 20 0 08 External static pressure in WG Pa External static pressure in WG Pa 10 0 04 Rated point 0 4 5 6 7 8 9 10 4 5 6 7 8 9 10 1412. A 30 20 d TERESHOLD OF HEARING FOR quus i MM d LL M ATA LLASA La Moulded z Q e OCTAVE BAND SOUND PRESSURE LEVEL dB 0 dB OCTAVE BAND SOUND PRESSURE LEVEL dB 0 dB i Q N ah LA ee eee WENN sells nel oy del dol Foo s AM 250 500 1000 2000 4000 8000 BAND CENTER FREQUENCIES Hz SEZ KD15NA 4 External static pressure 0 14 in WG 35Pa ESE 80 0 0002 ubar TEZZA 70 z o N e 60 z Q o 50 40 z Q o MT Mg gl 2 Q e OCTAVE BAND SOUND PRESSURE LEVEL dB 0 dB 30 20 F TERESHOLD OF HEARING FOR oo 10 a 125 250 500 1000 2000 4000 8000 BAND CENTER FREQUENCIES Hz OCTAVE BAND SOUND PRESSURE LEVEL dB 0 dB Q N E RE NEE ELIO JEN NES axe EE LI x L SEZ KD15NA 4 External static pressure 0 06 in WG 15Pa ESS ann 0 0002 ubar B 60 o 50 gt o eo 40 ir apamama pa 8 712777 CERT CUT HNC 40 30 INC 30 20 APPROXIMATE E TERESHOLD OF NS HEARING FOR NC 2 quus _ 10 s A 250 500 1000 2000 4000 8000 BAND CENTER FREQUENCIES Hz 60Hz SEZ KD15NA 4 SPL dB LINE External static pressure 0 20 in WG 50Pa SPL dB LINE 39 E96 M NEL 90 80 0 0002 ubar E 70 INC 70 60 z Q o 50 40 z Q o 30 z
3. 32 Rs 7 7 DC FAN MOTOR FAN 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 CNMF for the motor with the power supply on It causes trouble of the indoor controller circuit board and fan motor 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 1 B Replace fan motor MF Did the fuse blow V No Wiring contact check Contact of fan motor connector CNMF Yes 9 Y No v Replace drain pump DP Is there no contact failure gt No gt Yes Power supply check Remove the connector CNMF Measure the voltage in the indoor controller circuit board TEST POINT Voc between 1 and 4 of the fan connector Voc DC294 340V TEST POINT Vcc between 5 and 4 of the fan connector Vcc DC15V v Is the voltage normal Yes gt Replace the fan motor V No Yes OK Check the operation of fan gt Replace indoor controller board Y oK Replace indoor controller board Check the operation gt V NG Replace the fan motor 33 8 DISASSEMBLY PROCEDURE Exercise caution when removin
4. 50 0 20 PA 40 0 16 Middle a lt N lt 0 6 7 8 9 1 11 12 212 247 282 318 353 388 424 Airflow rate m min CFM Rated point Se xm External static pressure in WG Pa 20 0 08 10 0 04 0 SEZ KD15NA 4 External static pressure 0 02 in WG 5Pa 208 230V 60Hz External static pressure in WG Pa 8 9 10 11 12 13 14 15 282 318 353 888 424 459 494 530 Airflow rate m min CFM SEZ KD15NA 4 External static pressure 0 14 in WG 85Pa 208 230V 60Hz External static pressure in WG Pa 8 9 10 282 318 353 388 424 459 494 530 Airflow rate m min CFM 16 565 565 SEZ KD15NA 4 External static pressure 0 06 in WG 15Pa 208 230V 60Hz External static pressure in WG Pa 8 9 10 11 12 13 14 15 16 282 318 353 388 424 459 494 530 565 Airflow rate m min CFM SEZ KD15NA 4 External static pressure 0 20 in WG 50Pa 208 230V 60Hz External static pressure in WG Pa 8 9 10 11 12 13 14 15 16 282 318 353 388 424 459 494 530 565 Airflow rate m min CFM 12 SEZ KD18NA 4 External static pressure 0 02 in WG 5Pa 208 230V 60Hz External static pressure in WG Pa 9 10 11 12 13 14 15 16 17 18 19 318 353 388 424 459 494 530 565 600 636 671 Airflow rate m min CFM SEZ KD18NA 4 External static pressure 0O 14 in WG 35Pa
5. e 20 2 Q N LES ELIT EE se Sa aan LS TERESHOLD OF HEARING FOR SEI pd 12 250 500 1000 2000 4000 8000 BAND CENTER FREQUENCIES Hz NOTE The sound level is measured in an anechoic room where echoes are few when compressor stops The sound may be bigger than displayed level under actual installation condition by surrounding echoes The sound level can be higher by about 2 dB than the displayed level during cooling and heating operation 60Hz SPL dB ign 38 SEZ KD18NA 4 External static pressure 0 02 in WG 5Pa 0 0002 ubar OCTAVE BAND SOUND PRESSURE LEVEL dB 0 dB SEZ KD18NA 4 External static pressure 0 14 in WG 35Pa 0 0002 ubar nnnm L 8721222777 IH OCTAVE BAND SOUND PRESSURE LEVEL dB 0 dB 90 80 INC 7 o gt D e e T OCTAVE BAND SOUND PRESSURE LEVEL dB 0 P OF HEARING FOR 2 N m i iE it r i RC Pew Ji 1000 2000 BAND CENTER FREQUENCIES Hz 4000 8000 E Ne DN I T ERE 70 z O N e HHH 60 o o 50 N MX ES 40 2 Oo o IB 5 Oo e o OCTAVE BAND SOUND PRESSURE LEVEL dB 0 dB R p 20 ES OF HEARING FOR 2 Oo N TED 250 1000 2000 BAND CENTER FREQUENCIES Hz 4000 8000
6. 208 230V 60Hz 80 0 32 70 0 28 50 Cope 40 0 16 Middle Rated iut 30 20 0 08 10 SEHR 0 9 10 11 12 13 14 15 16 17 18 19 318 353 388 424 459 494 530 565 600 636 671 Airflow rate m min CFM External static pressure in WG Pa 13 SEZ KD18NA 4 External static pressure 0 06 in WG 15Pa 208 230V 60Hz External static pressure in WG Pa 9 10 11 12 16 17 318 353 388 424 459 494 530 565 600 636 671 Airflow rate m min CFM SEZ KD18NA 4 External static pressure 0 20 in WG 50Pa 208 230V 60Hz Rated point UN External static pressure in WG Pa 9 10 11 12 13 14 15 16 17 18 19 318 353 388 424 459 494 530 565 600 636 671 Airflow rate m min CFM SEZ KDO9NA 4 SEZ KD12NA 4 SEZ KD15NA 4 SEZ KD18NA 4 15 19 32 2 02 9 1 8 100 3 15 16 1 el 1 H M EF z 10 13 32 49 1 15 16 20 13 16 30 1 3 16 57 2 1 4 24 5 8 Drain 0 032 1 1 4 700 27 9 16 T N 1 T 23 29 32 10 13 32 5 29 32 ml RE Y yam 7 150 Duct LO 116 4 19 32 3 15 16 2 2 02 9 1 8 Refrigerant pipino flare connection gas 2 Refrigerant piping flare connection liquid Model CJD 700 752 798 660 SEZ KD09NA 2 9 s o SEZ KD12NA 4 90
7. If no problem are found indoor controller board is defective When LED1 on indoor controller board is also blinking Check indoor outdoor unit connecting wire for connection failure Check the connection of remote con troller wires in case of twin triple indoor unit system When 2 or more indoor units are wired in one refrigerant system connect remote controller wires to one of those units 2 Check the setting of refrigerant address in case of grouping control system If there are some units whose refrigerant addresses are 0 in one group set one of the units to using SW1 3 6 on outdoor controller circuit board Remove remote controller wires and check LED2 on indoor controller board e When LED is blinking check the short cut of remote controller wires e 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 7 5 TEST POINT DIAGRAM 7 5 1 Indoor controller board SEZ KDO9NA SEZ KD12NA SEZ KD15NA SEZ KD18NA Fuse 6 3A 250V Fe Ur a 3 2 ok kq A CNMF nh A d 2 2 C626 Pce72 LED1 CN4Y LED3 i TT Pq d L Ell ene CNO90 M E T 3 EU rne ma a 30 CNO1 SWE SW1 SW2 CN32 CN24 CN22 CN51 CN41
8. REMOTE CONTROLLER TRANSMISSION LINE INDOOR OUTDOOR CONNECTING LINE 5 REFRIGERANT SYSTEM DIAGRAM SEZ KDO9NA 4 SEZ KD12NA 4 SEZ KD15NA 4 SEZ KD18NA 4 Strainer 50 Heat exchanger Refrigerant GAS pipe connection Flare Refrigerant flow in cooling Refrigerant flow in heating Refrigerant LIQUID pipe connection Flare Condenser evaporator temperature thermistor Tt Pipe temperature Room temperature thermistor liquid thermistor TH1 TH2 u Distributor 17 6 HEATER CONTROL 6 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 wireless remote controller Mod Setting Setting Initial setting Heater control Heater OFF Inlet air temp 2 set temp Heater ON Inlet air temp lt set temp 4 5 F 2 5 C The fan will stop and the heater will turn off when DEFROST or ERROR is displayed Set temp Set temp 1 8 F 1 C Set temp 4 5 F 2 5 C Heater output Heater OFF Inlet air temp 2 set temp Heater ON Inlet air temp set temp 1 8 F 2 5 C The fan will drive and the heater will turn on when DEFROST or ERROR is displayed Set temp Set temp 1 8 F 2 5 Heate
9. 612 7 Flare 91 2 612 7 Flare O D 1 1 4 32 O D 1 1 4 32 Sound level Low Mid High U I dB lt A gt 30 34 37 30 34 38 measured in anechoic room Insulation material Polystyrene foam Polyethylene foam Urethane foam Air filter PP Honeycomb fabric washable Refrigerant control device SS S 3 5 68 5 OS Protection devices Fuse 250V 63A Heat exchanger Cross fin Aluminum fin and copper tube Varistor ERZVI0D471 Terminal block To outdoor unit 3P To wired remote controller 2P Power outlet Installation Manual Instruction Book Installation Manual Instruction Book Standard attachment Drain hose flexible joint lt Wired Remote Controller gt Drain hose flexible joint lt Wired Remote Controller gt Note 1 Cooling Heating capacity indicates the maximum value at operation under the following condition Cooling Indoor 80 FD B 67 FW B 26 7 CD B 19 4 CW B Outdoor 95 FD B 35 CD B Heating Indoor 70 FD B 21 1 CD B Outdoor 47 FD B 43 FW B 8 3 CD B 6 1 CW B Pipe length 24 9 16ft 7 5m Height difference Oft Om 2 Power consumption Run current at 0 06 in WG 15Pa external static pressure 3 Cooling capacity value at 1 1system Heating capacity value at 1 1system 4 lt gt SEZ KD NA only Model Name Capacity Cooling 14100 2 Power source Power input Current Temperature set range Remote controller Airflow direction Fan Type x Quantit External static press in WG Pa Moto
10. CN44 on the indoor controller indoor controller board Refer to 7 5 Turn thermistor is detected Abnormal if the board Insert failure the power on again and check restart after unit does not reset normally after three Breaking of wire or contact 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 or mode or high in heating mode refrigerant operation 40 C 40 F or less circuit may have defective 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 liquid 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 D Extract when the connector of drain float Insert failure tor switch is disconnected Turn the power on again and check after and of connector CN4F is not inserting connector again sho
11. 0kQ The unit is in three minute resume Contact failure of connector 10 C 50 F 9 6kQ prevention mode if short open of CN20 on the indoor controller 20 C 68 F 6 3kQ thermistor is detected Abnormal if the board Insert failure 30 C 86 F 4 3kQ unit does not reset normally after three Breaking of wire or contact 40 C 104 F 3 0kQ minutes The unit returns to normal failure of thermistor wiring If you put force on draw or bend the lead wire operation if it has normally reset Defective indoor controller with measuring resistance value of thermistor Constantly detected during cooling board breaking of wire or contact failure can be drying and heating operation detected Short 90 C 194 F or more 2 Check contact failure of connector CN20 on Open 40 C 40 F or less the indoor controller board Refer to 7 5 Turn the power on again and check restart after inserting connector again 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 D Defective thermistor 0 9 Check resistance value of thermistor thermistor Liquid TH2 characteristics For characteristics refer to P1 above The unit is in three minute resume Contact failure of connector 2 Check contact failure of connector CN44 on prevention mode if short open of
12. 176 212 247 282 318 353 141 176 212 247 282 318 353 Airflow rate m min CFM Airflow rate m min CFM SEZ KD09NA 4 SEZ KD09NA 4 External static pressure 0 14 in WG 35Pa 208 230V 60Hz External static pressure 0 20 in WG 50Pa 208 230V 60Hz External static pressure in WG Pa External static pressure in WG Pa LAC LEAL P di Rated point VA Middle lt x i N 4 5 6 7 8 9 10 4 5 6 7 8 9 10 141 176 212 247 282 318 353 141 176 212 247 282 318 353 Airflow rate m min CFM Airflow rate m min CFM 10 SEZ KD12NA 4 External static pressure 0 02 in WG 5Pa 208 230V 60Hz External static pressure in WG Pa 6 7 8 9 10 11 212 247 282 318 353 388 Airflow rate m min CFM SEZ KD12NA 4 External static pressure 0 14 in WG 85Pa 208 230V 60Hz 80 0 32 70 0 28 60 0 24 50 0 20 40 0 16 30 0 12 External static pressure in WG Pa 20 0 08 10 0 04 0 6 7 8 212 247 282 318 353 388 Airflow rate m min CFM 12 424 11 SEZ KD12NA 4 External static pressure 0 06 in WG 15Pa 208 230V 60Hz External static pressure in WG Pa 6 7 8 9 10 11 12 212 247 282 318 353 388 424 Airflow rate m min CFM SEZ KD12NA 4 External static pressure 0 20 in WG 50Pa 208 230V 60Hz 80 0 32 70 0 28 60 0 24 TA e
13. 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 TH5 TH1 Cooling or drying mode D Clogged filter reduced airflow 2 Short cycle of air path Low load low temperature operation beyond the tolerance range Defective indoor fan motor e Fan motor is defective Indoor controller board is defective Cooling or drying mode Check clogging of the filter Remove shields Refer to 7 7 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 e Indoor controller board is defective Heating mode D Check clogs of the filter 2 Remove shields Refer to 7 7 DC Fan motor FAN MOTOR INDOOR CONTROLLER BOARD Check outdoor fan motor 6 amp 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 d
14. 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 Defective transmitting receiving O 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 D 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 E1 remote controller control board Error code E1 or E2 Abnormal if the clock function of remote controller cannot be operated normally Error code E2 Water leakage Mis piping of extension pipes OCheck the extension pipes for mis piping This detection is performed during the When connected with multiple operation stop heating fan or error stop units mode etc other than cooling and dry When a and b are found water leak
15. fixing screws on the heat exchanger M to remove it Fig 16 38 MITSUBISHI ELECTRIC CORPORATION http Global MitsubishiElectric com New publication effective Apr 2012 HWE0802B Specifications subject to change without notice
16. to the technical manual for the outdoor unit On wired remote controller D Check code displayed in the LCD 21 If the unit cannot be operated properly after the test run has been performed refer to the following table to remove the cause Symptom Cause Wired remote controller LED 1 2 PCB in outdoor unit Forabout2 After LED 1 2 are lighted LED 2 is about 2 minutes after power on op PLEASE WAIT minutes after turned gu then only LED 1 is eration of the remote controller is not possible power on lighted Correct operation due to system start up Correct operation Connector for the outdoor unit s protection Only LED 1 is lighted gt device is not connected PLEASE WAIT Error code After about 2 LED 1 2 blink or open phase wiring for the outdoor minutes has unit s power terminal block L1 L2 L3 Display messages do not een Only LED 1 is lighted gt e Incorrect wiring between indoor and outdoor appear even when operation LED blinks twice units incorrect polarity of S1 S2 S3 switch is turned ON operation LED 2 blinks once Remote controller wire short lamp does not light up On the wireless remote controller with condition above following phenomena take place No signals from the remote controller are accepted Operation lamp is blinking The buzzer makes a short piping sound Note Operation is not possible for about 30 seconds after
17. 0 952 998 860 37 1 2 39 5 16 33 7 8 SEZ KD15NA 4 9 1100 1152 1198 1060 SEZ KD18NA 4 Note1 Use M10 screw for the suspension bolt field supply 2 Keep the service space for the maintenance at the bottom 3 This chart indicates for SEZ KD15NA 4 model which has 3 fans SEZ KD09 12NA 4 models have 2 fans SEZ KD18NA 4 models have 4 fans 4 In case an inlet duct is used remove the air filter supply with the unit then install the filter field supply at suction side 1060 41 34 1000 39 3 8 1200 47 1 4 625 Suspension bolt pitch 23 29 32 677 26 21 32 Control box 7 8 7 27 9n6 35 7 16 48 25 32 46 7 8 OUTLINES AND DIMENSIONS Unit mm in 37 1 15 32 100 3 15 16 Suspension bolt hole 20 13 16 157 5 6 7 32 4 14 30 9 16 1 3 16 Slot 1201 2 ZZ 37 1 15 32 02 9 1 8 mm Terminal block Indoor outdoor connecting line Terminal block Remote controller transmission line 88 3 15 32 M Air inlet P X lt gt B Suspension bolt pitch 100 3 15 16 XX XK 88 3 15 32 4 Z lt SX XX LLLE o 6 miai RS 4 P IT 1 POS ih P Q Air filter 12 1 2 20 13 16 90 3 9 16 23 29 32 Knockout hole 227 1 3 32 Indoor outdoor connectin
18. 000 8000 SEZ KD12NA 4 External static pressure 0 06 in WG 15Pa 0 0002 ubar OCTAVE BAND SOUND PRESSURE LEVEL dB 0 dB SEZ KD12NA 4 External static pressure 0 20 in WG 50Pa 0 0002 ubar OCTAVE BAND SOUND PRESSURE LEVEL dB 0 dB R 80 IUD NN dne z n A e gt vi TERESHOLD OF HEARING FOR ours gt N dy MV WCE FA d eee A He p o ET 1 10 250 500 1000 2000 BAND CENTER FREQUENCIES Hz 4000 8000 NM DES S EM M 70 z Q N e 60 E iN ic RSS SSS o e FIM 50 SS 5 NS M 40 z Q o NM 20 FEE TERESHOLD OF DE HEARING FOR NE 10 CENE J 250 500 1000 2000 BAND CENTER FREQUENCIES Hz L DZ j 4000 8000 2 z e sal oe elo o oo ef ee NOTE The sound level is measured in an anechoic room where echoes are few when compressor stops The sound may be bigger than displayed level under actual installation condition by surrounding echoes The sound level can be higher by about 2 dB than the displayed level during cooling and heating operation T INE M x SEZ KD15NA 4 External static pressure 0 02 in WG 5Pa ESSEN 0 0002 ubar 152 ms 60 o 50 gt t eo z Q o
19. 395 AUTO OFF E Up Down Air Direction indica Room Temperature display tor Shows the room temperature The indicator N shows the direc tion of the outcoming airflow Louver display Indicates the action of the swing One Hour Only indicator Displayed if the airflow is set to Low and downward during COOL or DRY mode Operation varies louver Does not appear if the louver is stationary Power On indicator Indicates that the power is on according to model The indicator goes off after one hour at which time the airflow di rection also changes Sensor indication Displayed when the remote controller sensor is used Locked indicator Indicates that remote controller but tons have been locked Clean The Filter indicator Comes on when it is time to clean the filter Timer indicators The indicator comes on if the corre sponding timer is set Fan Speed indicator Shows the selected fan speed Ventilation indicator Appears when the unit is running in Ventilation mode f you press a button for a feature that is not installed in the indoor unit the remote controller will display the Not Available message If you are using the remote controller to operate multiple indoor units this message will appear only if the feature is not present at the parent unit When power is turned ON for the first time it is normal that PLEASE WAIT is displayed on the roo
20. C NG is displayed replace different data to be abnormal 30 continuous times Error code E5 remote controller troller c When RC E3 or ERC 00 66 is displayed noise may be causing abnormality 27 Indoor outdoor unit communication D 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 D Abnormal if indoor controller board indoor outdoor unit connecting PAC SK52ST cannot receive any signal normally for wire Refer to Outdoor manual six minutes after turning the power on D Check disconnection or looseness of indoor Abnormal if indoor controller board Defective transmitting receiving outdoor unit connecting wire of indoor unit or cannot receive any signal normally for circuit of indoor controller board outdoor unit three minutes Defective transmitting receiving Check all the units in case of twin triple E6 Consider the unit as abnormal under the circuit of indoor controller board indoor unit system following condition When two or more Noise has entered into indoor 9 Turn the power off and on again 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
21. CN44 CN4F CN20 CN3C CNMF Vcc Vsp Power supply voltage 208 230VAC Emergency operation Model selection Capacity setting Remote start stop adapter Heater control 12VDC For MA remote controller cable con nection 10 18 VDC Between 1 and 3 Centralized control JAMA standard HA terminal A Thermistor liquid condenser evaporator temperature Float thermistor Thermistor Inlet temperature Indoor outdoor transmission 0 24VDC Fan motor output 1 4 294 340 VDC 5 4 15 VDC 6 4 0 6 5 VDC 7 4 Stop 0 15 VDC Run 7 5 VDC 0 15 pulse Drain up mechanism output 200VAC LOSSNAY For Fan control Wireless remote controller Voltage on the side of PC672 and C955 Same with the voltage between 7 and 4 of CNMF Voltage between the C955 pins 15 VDC Same with the voltage between 5 and 4 of CNMF Voltage between the C626 pins OVDC with the fan stopped 1 6 5VDC with the fan in operation Same with the voltage between 6 and 4 of CNMF 5 2 09 4 SEZ KD12NA4 SEZ KD15NA4 SEZ KD18NA4 Fuse 6 3A 250V LED1 LED2 CN20 L IE E a 4 J i t CN105 CN4Y LED3 CNO1 SWE SW1 SW2 Power supply voltage 208 230VAC Emergency operation Model selection Capacity setting CN105 Radio frequency interface CN32 CN24 CN22 CN51 CN41 CN44 CN4F CN20 CN3C CNMF Vsp R
22. F CONTROL BOX 0 5 9 CN24 CN32 YELLOW CN51 CN41 SW1 SW2 DC294 340V RECTIFY CIRCUIT pen 2 ON OFF CN22 BLUE SWE qum saa sss EAE i gt TBS y gue le 4217 rans d QS 5 _LED1 DRAINPUMP J n I ILE d FS TH2 TH5 THI 32 eee qt FAN MOTOR R B m 5 WB PARTS LOCATION SYMBOL EXPLANATION SYMBOL NAME SYMBOL NAME SYMBOL NAME INDOOR CONTROLLER BOARD INDOOR CONTROLLER BOARD LED3 WHITE CN90 LED2 RED CN105 POWER SUPPLY POWER SUPPLY LED3 TRANSMISSION INDOOR OUTDOOR WHITE CN4F TB15 WHITE CN44 RED LED1 CN20 CN30 GREEN 2 eel K TERMINAL BLOCK REMOTE CONTROLLER TRANSMISSION LINE RADIO FREQUENCY INTERFACE FOR RF THERMOSTAT WHITE CNMF Note1 Since the outdoor side electric wiring may change be sure to check the outdoor unit electric wiring for servicing 2 Indoor and outdoor connecting wires are made with polarities make wiring matchingterminal numbers 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 16 TO OUTDOOR UNIT SWE CONNECTOR EMERGENCY OPERATION FLOAT SWITCH EN TERMINAL BLOCK CONNECTOR WIRELESS
23. MITSUBISHI Changes for the Better a ELECTRIC SPLIT TYPE HEAT PUMP AIR CONDITIONERS 201 2 R410A TECHNICAL amp SERVICE MANUAL Ceiling Concealed Model name Indoor unit SEZ KDO9NA 4 SEZ KD12NA 4 SEZ KD15NA 4 SEZ KD18NA 4 WIRED REMOTE CONTROLLER CONTENTS CON O RP ON PART NAMES AND EUINCTIONS a 2 GBECIEICATIONS ead Privato RU dU Desi err errr cer rer reer re 4 OUTLINES AND DIMENSIONS u 14 WIRING DIAGRA W DI LII III DM 15 AREERIGERANT SYSTEM DIAGRAM u esa ado asd oS ex dn o orina 17 HEATER 6GNTR0O0L ul u Eaa aAa a uska ash Tree 18 I u E E cr rrr rr 21 DISASSEMBLY BROCEDIIEBE annus van uu PU eerie 34 1 PART NAMES AND FUNCTIONS Indoor Unit SEZ KDO9NA 4 SEZ KD12NA 4 SEZ KD15NA 4 SEZ KD18NA 4 Air outlet Air outlet duct flange Air inlet Wired remote controller Once the controls are set the same operation mode can be repeated by simply pressing the ON OFF button e Operation buttons Set Temperature buttons Down Up Timer Menu button Monitor Set button Mode button Return button Set Time buttons Back Timer On Off button Set Day button Opening the EA MITSUBISHI ELECTRIC El DRGAS OON OFF ul BACK MONITOR SET DAY XT AR 21MAA CL
24. N 2 QJ eqr 200070 ANNOS 3AVLOO QJ eqr 200070 gp 13A31 ANNOS 3AVLOO BAND CENTER FREQUENCIES Hz may be bigger than displayed level under actual installation condition by surrounding echoes The sound level NOTE The sound level is measured in an anechoic room where echoes are few when compressor stops The sound can be higher by about 2 dB than the displayed level during cooling and heating operation a 60Hz SPL dB ih 83 SEZ KD12NA 4 External static pressure 0 02 in WG 5Pa 0 0002 ubar OCTAVE BAND SOUND PRESSURE LEVEL dB 0 dB SEZ KD12NA 4 External static pressure 0 14 in WG 35Pa 0 0002 ubar 94 OCTAVE BAND SOUND PRESSURE LEVEL dB 0 dB Tm ENS dili zo RR o Mu TIGE o Z M gt D e e T TERESHOLD OF HEARING FOR cures SE REI Nia SSN imn Q r i 250 1000 2000 BAND CENTER FREQUENCIES Hz 4000 8000 i NAR MNN X MS ERECTO 70 gt N e 60 o e 50 E BE SSES gt 40 z Q 30 n C eo 20 ii TERESHOLD OF JD AE EI Ji AE JUN NE TENE HEARING FOR No ee gt N e E 4
25. OCK E k Start Stop button Fan Speed button Filter 1 button return sign button Test Run button Service button Clear button Airflow Up Down button Louver button Operation button CV To preceding operation number Ventilation button Operation button A To next operation number Display For purposes of this explanation all parts of the display are shown as lit During actual operation only the relevant items will be lit Identifies the current operation Shows the operating mode etc Multilanguage display is sup ported Centrally Controlled indicator Indicates that operation of the re mote controller has been prohib ited by a master controller Timer Is Off indicator Indicates that the timer is off Temperature Setting Shows the target temperature Caution Only the Power on indicator lights when the unit is stopped and power supplied to the unit OOCeEc e ONIN S C IN Day of Week Shows the current day of the week Time Timer Display Shows the current time The 12 hour clock or The 24 hour clock unless the simple or Auto Off timer is set If the simple or Auto Off timer is set shows the time remaining TIME SUN MON TUE WED THU FRI SAT TIMER I L L Hr ON AFTER L AFTER OFF ERROR CODE U UNCTIO 3E 5 Fe t WEEKLY s ere SIMPLE ONLY1Hr
26. acing indoor controller board in group control indoor controller board of address 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 main other to sub find blank of transmission path for six In case of 2 remote con seconds and could not transmit Error code E3 trollers 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 T circuit of remote controller a When RC OK is displayed remote con D Abnormal if indoor controller board could trollers h bl not find blank of transmission path 5 Defective transmitting receiving rovers nave no problem Error code E5 circuit of indoor controller power Rp d pond lo dads or Indoor controller board receives trans board E EE iE eel TSP UE E5 mitted data at the same time compares Noise has entered into trans M the data and when detecting it judges mission wire of remote con b When R
27. age Mis wiring of indoor outdoor Check the Indoor outdoor unit connecting OCCUIS unit connecting wire When wire for mis wiring a Pipe liquid temperature inlet tem connected with multiple units perature lt 10 C 14 F for 30 minutes b When drain float switch is detected to Detection failure of the indoor Check room temperature display on remote be soaked in the water for 15 minutes unit inlet pipe liquid ther controller and indoor pipe liquid tempera or more mistor ture Refer to the countermeasure on P2 When drain float switch is detected to be NOT soaked in the water each Drain pump failure Check if drain up machine works counting of a and b is cleared amp Drainage failure When this error is detected the error Clogged drain pump Check drain function will not be reset until the main power is Clogged drain pipe PA reset 2500 Drain float switch failure Check drain float switch Refer to the coun Drain float switch is detected termeasure on P4 and P5 to be soaked in the water ON status due to the operation failure of the moving parts Contact failure of drain float switch connector Loose connector 28 EN 7 4 TROUBLESHOOTING BY INFERIOR PHENOMENA Note Refer to the manual of outdoor unit for the detail of remote controller Phenomena Cause Countermeasure 1 LED2 on indoor controller board is off e When LED1 on indoor controller board is also off Power
28. cancellation of function selection Correct operation For description of each LED LED1 2 3 provided on the indoor controller refer to the following table LED1 power for microcomputer Indicates whether control power is supplied Make sure that this LED is always lit LED2 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 0 LED3 communication between indoor and Indicates state of communication between the indoor and outdoor units outdoor units Make sure that this LED is always blinking 22 e 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 o ee a Pos PQ Liquid or 2 phase pipe sensor error _ HE E C E E Tee Commuicsionemorbsweenindorandoudorunis Oo es Pipe temperature ener E4 RemoecoolersgmilreceMmgemo r 2 Fp dooruntconwosysememor memoyemonei Nesund Output pattern B Errors detected by unit other than indoor unit outdoor unit etc Wired remote controller Beep
29. continuous buzzer sounds from receiving section of indoor unit Blink of operation lamp On wired remote controller Check code displayed on the LCD e f the unit cannot be operated properly after the test run has been performed refer to the following table to remove the cause Symptom TR Wired remote controller LED 1 2 PCB in outdoor unit After LED 1 2 are lighted LED 2 is turned 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 PLEASE cn EOD cour iar Shout mine Only LED 1 is lighted gt LED 1 2 blink Reverse or open phase wiring for the outdoor unit s power terminal block L1 L2 L3 utes has expired Display messages do not appear d g following power on Incorrect wiring between indoor and outdoor units even when operation switch is Only LED 1 is lighted gt LED 1 2 blinks incorrect polarity of 1 S2 3 n Buceo ope DURS Ones Remote controller wire short not light up On the IR wireless remote controller with conditions above following phenomena takes place No signals from the remote controller are accepted e OPE lamp is blinking e The buzzer makes a short ping sound Note Operation is not poss
30. ded 2 Panel heater connector 3 in total White 1 Green 2 2 types 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 Connect the cable to CN24 on the indoor unit control board 2 Panel heater connector with a white connector This connector is used to perform an interlocked operation with a panel heater Depending on the indoor unit control board specification connect the cable to CN4Y as appropriate Image CN4Y for FAN control PAC YU25HT 2 3 Locally procured wiring A basic connection method is shown below NS Indoor unit Remote control board Relay circuit Adapter control board E ee cii W ee e O Eg 5 i z p D T T s o gt D O X a j 1 sil Electric Heater or panel 3 heater applicable only when a panel u s Illi 1 L helerisonmede _ _ E gt Preparations in the field Maximum cable length is 10 m 82ft 19 For relay X use the specifications given below Rated voltage 12VDC Power consumption 0 9W or less Use the diode that is recommended b
31. emote start stop adapter Heater control 12VDC For MA remote controller cable con nection 10 13 VDC Between 1 and 3 Centralized control JAMA standard HA terminal A Thermistor liquid condenser evaporator temperature Float thermistor Thermistor Inlet temperature Indoor outdoor transmission 0 24VDC Fan motor output 1 4 294 340 VDC 5 4 15 6 4 0 6 5 VDC 7 4 Stop 0 15 VDC Run 7 5 VDC 0 15 pulse Drain up mechanism output 200VAC LOSSNAY For Fan control Wireless remote controller Voltage on the side of PC672 and C955 Same with the voltage between 7 and 4 of CNMF Voltage between the C955 pins 15 VDC Same with the voltage between 5 and 4 of CNMF Voltage between the C626 pins OVDC with the fan stopped 1 6 5VDC with the fan in operation Same with the voltage between 6 and 4 of CNMF 7 6 TROUBLE CRITERION OF MAIN PARTS SEZ KDO9NA 4 SEZ KD12NA 4 SEZ KD15NA 4 SEZ KD18NA 4 Check method and criterion Room temperature Measure the resistance with a tester thermistor Part temperature 10 C 50 F 30 C 86 F TH1 p Pipe temperature m thermistor liquid 8k 20kO Opened or short circuited TH2 Condenser evaporator temperature thermistor TH5 Wiring diagram Vm Power supply for motor Vcc Power supply for control Vsp Speed command voltage PG Pulse output for rotation
32. er sounds OPERATION Symptom DB INDICATOR lamp flashes Check code Number of times A E9 indoor outdoor unit communication error Transmitting error Outdoor unit x 3 orn J Compressor overcurrentinterupton 3 sort of outdoor unit themistors ur cempessoroverurentinerphon When compressore E78 us Frat high discharging temperature 49C worked insuficient refrigerant rl l 6 Ut Ud Abnormal high pressure 63H worked Overheating safeguard operation Abnormal temperature of heat sink For details check the LED 8 us tor unite protection sop pay of tne outdoor contro 9 U6 Compressor overcurrent interruption Abnormal of power module board U9 UH Abnormality such as overvoltage or voltage shortage and abnormal ME S S S S SS S S LL signal to main circuit Current sensor error ss errors Refer to the technical manual for the outdoor unit 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 not come on there are no error records 2 If the beeper sounds three times continuously beep beep beep 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 e On IR wireless remote controller The
33. g heavy parts SEZ KDO9NA 4 SEZ KD12NA 4 SEZ KD15NA 4 SEZ KD18NA 4 1 Control box 1 Removing the control box cover 1 Remove the two fixing screws on the cover A to remove it Fig 1 Fig 2 2 Thermistor Intake air 1 Remove the control box cover according to the procedure in section 1 1 Pull out the thermistor holder B and thermis tor C on the control box Fig 3 34 Exercise caution when removing heavy parts 3 Drainpan 1 Removing the filter and the bottom plate 1 Push up the tab on the filter and pull out the filter in the direction of the arrow 1 2 Remove the fixing screws on the bottom plate D E to remove it 2 Removing the drainpan 1 Pull out the drain pan in the direction of the arrow 1 Note e Drain the water out of the drain pan before removing it e To avoid dew condensation use insulated screws in the places marked with circles in Fig 6 Insulation material Fig 6 35 C ll Exercise caution when removing heavy parts 4 Thermistor Condenser evaporator Liquid pipe 1 Remove the drain pan according to the proce dure in section 3 2 Removing the Heat exchanger cover 1 Remove the four fixing screws on the heat exchanger cover F to remove it Fig 7 3 Removing the thermistor 1 Remove the thermistor G from the thermistor holder H on the copper tube 7 Thermistor size Liquid pipe 3 8inch 8mm C
34. g line Knockout hole 927 1 3 32 Remote controller transmission line 170 6 23 32 102 4 1 32 200 7 7 8 4 5 LI I Drain pipe O D 632 1 1 4 Spontaneous draining Less than 300 21 21 32 More than 10 Less than 550 Make the access door at the appointed position properly for service maintenance lt accessory gt mm in 39 I 09 52 3 8 3 0 70 9 39 06 35 1 4 8 3 10 40 29 32 12 14 4 WIRING DIAGRAM SEZ KDO9NA SEZ KD12NA SEZ KD15NA SEZ KD18NA INSIDE SECTION OF CONTROL BOX TO MA REMOTE CONTROLLER Black h DSA 64 DC310 340V ZN i FUSE Rectify circuit CN90 000000000 S S5 OUTDOOR o UNIT _ _ TH2 TH5 moe motor SYMBOL EXPLANATION INDOORIGUTDOOR CONNECTING LINE FARTS LOCATION CN90 CONNECTOR WIRELESS T POWER SUPPLY I B REMOTE CONTROLLER TRANSMISSION LINE Note1 Since the outdoor side electric wiring may change be sure to check the outdoor unit electric wiring for servicing 2 Indoor and outdoor connecting wires are made with polarities make wiring matching terminal numbers S1 S2 S3 3 Symbols used in wiring diagram above are Connector 9 Terminal 4 Use copper supply wire 15 SEZ KD09NA4 SEZ KD12NA4 SEZ KD15NA4 SEZ KD18NA4 INSIDE SECTION O
35. he components When connecting or disconnecting the connectors hold the housing of the connector DO NOT pull the lead wires x Q Lead wires Housing point 7 2 SELF CHECK FUNCTION Wired remote controller 1 Turn on the power 2 Press the CHECK button twice 3 Set refrigerant address with TEMP button if system control is used 4 Press the ON OFF button to stop the self check CHECK button Indoor Unit s Refrigerant address TEMP button IC Indoor unit OC Outdoor unit Check code Indoor Unit No lt 238 24 CHK TEST For description of each check code refer to the following table D Check code P1 Pipe TH5 sensor error Pe _ Freezing Overheating protection operation Pa Pipe temperature error I I Compressor overcurrent interruption For details check the LED display U1 Ud Abnormal high pressure 63H worked Overheating protection operation of the outdoor controller board Abnormal temperature of heat sink As for outdoor unit refer to Outdoor unit fan safeguard stop i sss Compressor overcurrent interruption Abnormal of power module Abnormality of super heat due to low discharge temperature U9 UH Abnormality such as overvoltage or voltage shortage and abnormal synchronous signal to main circuit EO E3 E5 Remote controller transmission error Current sensor error Other errors Refer
36. ible for about 30 seconds after cancellation of function selection Correct operation 23 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 0 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 24 s Note Refer to the manual of outdoor unit for the details of display 7 3 SELF DIAGNOSIS ACTION TABLE such as F U and other E Room temperature Defective thermistor 0 9 Check resistance value of thermistor thermistor TH1 characteristics 32 F 15
37. ifference between indoor room temperature and pipe liquid or condenser evaporator temperature thermistor e Shortage of refrigerant e Disconnected holder of pipe Check pipe liquid or condenser evaporator temperature with room temperature display on remote controller and outdoor controller circuit board Pipe liquid or condenser evaporator temperature display is indicated by liquid or condenser setting SW2 of outdoor controller circuit evaporator thermistor board as follows Defective refrigerant circuit Conduct temperature check with outdoor Converse connection of controller circuit board after connecting exer sion PIPE t A Control Service Tool PAC SK52ST 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 Check converse connection of extension pipe or converse wiring of indoor outdoor unit connecting wire 26 Abnormality of pipe temperature ther Defective thermistor Check resistance value of thermistor mistor Condenser Evaporator TH5 characteristics For characteristics refer to P1 above The unit is in three minute resume pro Contact failure of connector 2 Check contact failure of connector CN44 tection mode if short open of thermistor CN44 on the indo
38. m temperature indication For max 2minutes Please wait until this PLEASE WAIT indication disappears then start the operation SPECIFICATIONS Capacity Codng Heating amp Heating Power source A A 208230 v 603 0 208 230 608 1 Power input 0 05 Current 0 51 0 46 Temperature set range Remote controller 67 to 86 19 to 30 63 to 83 17 to 28 Airflow direction ee O Fan Type x Quantit Sirocco fan x 2 External static press in WG Pa 0 02 0 06 0 14 0 20 5 15 35 50 Motor type DC brushless motor Motor output 0 096 Driving mechanism Direct riven Airflow rate Low Mid High 5 5 7 0 9 0 Airflow rate Low Mid High 194 247 317 Airflow rate Low Mid High 91 116 150 External finish Galvanized External dimension 200 x 790 x 700 HxWxD 7 7 8 x 31 1 8 x 27 916 Net weight Wiring 1 8 1 6 Amperage of wire breaker Refrigerant Liquid R410A in 01 4 06 35 Flare piping diameter Gas R410A in mm 03 8 09 52 Flare 03 8 09 52 Flare Drain piping diameter O D 1 1 4 32 O D 1 1 4 32 Sound level Low Mid High 23 26 30 23 28 33 dB lt A gt measured in anechoic room Insulation material Polystyrene foam Polyethylene foam Urethane foam Air filter PP Honeycomb fabric washable Refrigerant control device __ C Protection devices Fuse 250V 6 3A Heat exchanger Cross fin Aluminum fin and copper tube Varistor ERZV10D471 Terminal block To outdoor unit 3P T
39. o wired remote controller 2P Power outlet Standard Installation Manual Instruction Book attachment Drain hose flexible joint Wired Remote Controller gt Drain hose flexible joint Wired Remote Controller Note 1 Cooling Heating capacity indicates the maximum value at operation under the following condition Cooling Indoor 80 FD B 67 FW B 26 7 CD B 19 4 CW B Outdoor 95 FD B 35 CD B Heating Indoor 70 FD B 21 1 CD B Outdoor 47 FD B 43 FW B 8 3 CD B 6 1 CW B Pipe length 24 9 16ft 7 5m Height difference Oft Om 2 Power consumption Run current at 0 06 in WG 15Pa external static pressure 3 Cooling capacity value at 1 1system Heating capacity value at 1 1system 4 lt gt SEZ KD NA only gt FCG x 1115 Hills 5 3 3 Min size of wire gt gt 3 3 5 2 3 3 i Document Accessory Remark SEZKDISNA Heating Heating 18000 21600 208 230V 60Hz 0077 eC 00 0 07 0 74 0 63 67 to 86 19 to 30 63 to 83 17 to 28 Sirocco fan x 3 0 02 0 06 0 14 0 20 5 15 35 50 DC brushless motor 0 096 Direct driven 10 0 12 5 15 0 Airflow rate Low Mid High 353 441 529 Airflow rate Low Mid High 167 208 250 External finish Galvanized External dimension 200 x 990 x 700 HxWxD 7718 x 39 x 27 9 16 Net weight Wiring 1 8 1 6 Amperage of wire breaker Liquid R410A in a174 06 35 Flare Gas R410A in mm 91 2
40. ondenser evaporator 1 4inch 6mm Fig 8 36 Exercise caution when removing heavy parts 5 Fan and fan motor 1 Removing the filter and the bottom plate 1 Push down the tab on the filter and pull out the filter in the direction of the arrow 1 2 Remove the fixing screws on the bottom plate J to remove it eee eal AN uam SS Fig 9 2 Removing the fan casing bottom half 1 Squeeze the tabs on the fan casing to remove it in the direction of arrow 2 3 Removing the motor cable 1 Remove the motor cable threw the rubber bush 4 Removing the fan motor and the Sirocco fan 1 Remove the two motor fixing screws to remove the motor and the Sirocco fan in the direction of arrow 3 2 Remove the four fan case fixing screws to take the top half of the fan casing off a Exercise caution when removing heavy parts 6 Bearing KD15 18NA 4 model only 1 Removing the bearing 1 Remove the two fixing screws on the bearing cover K to remove it Fig 13 2 Remove the two bearing retainer screws to remove the bearing Fig 14 7 Heat exchanger 1 Remove the drain pan according to the proce dure in section 3 2 Remove the heat exchanger cover according to the procedure in section 4 2 3 Removing the cover 1 Remove the two fixing screws on the cover L to remove it Fig 15 4 Removing the Heat exchanger 1 Remove the
41. or controller on the indoor controller board is detected Abnormal if the unit does board Insert failure Refer to 7 5 not get back to normal within three min Breaking of wire or contact Turn the power on and check restart after utes The unit returns to normal opera failure of thermistor wiring tion if it has normally reset Temperature of thermistor is j evaporator gt Constantly detected during cooling dry 90 C 194 F or more or If pipe condenser evaporator tempera ing and heating operation except 40 C 40 F or less caused by ture is extremely low in cooling mode or defrosting defective refrigerant circuit high in heating mode refrigerant circuit Short 90 C 194 or more Defective indoor controller may have defect Open 40 C 40 F or less board When no problems are found in O above replace the indoor unit control board Remote controller transmission Contact failure at transmission Check disconnection or looseness of indoor error E0 signal receiving error E4 wire of remote controller unit or transmission wire of remote controller D Abnormal if main or sub remote con All remote controllers are set Set one of the remote controllers main if troller can not receive normally any as sub remote controller In there is no problem with the action above transmission from indoor unit of refriger this case EO is displayed on Check eee
42. or remote conten ant address 0 for three minutes remote controller and E4 is CUBO UPS Error code EO displayed at LED LED1 LED2 e The number of connecting indoor units Abnormal if sub remote controller could on the outdoor controller circuit max 16units 9 not receive for any signal for two min board The number of connecting remote con utes Error code E0 Mis wiring of remote controller troller max Defective transmitting receiving D 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 EO remote controller board or from other circuit of indoor controller board Diagnose remote controllers or indoor controller board for three minutes of refrigerant address 0 a When RC is displayed E4 Error code E4 8 Noise has entered into the Hemote 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 RC is displayed Replace remote controller c When RC is displayed d When ERC 00 06 is displayed c d 5Noise may be causing abnormality If the unit is not normal after repl
43. r output Refer to the Installation Manual for function settings 6 2 Fan control By setting the Mode No 23 in the Function Table in section 6 1 and using CN4Y on the optional parts PAC YU25HT the following patterns of fan control will become possible when DEFROST or ERROR is displayed Fan control patterns when DEFROST or ERROR is displayed x _ _ _ __ Heater is installed the duct No heater is installed in the duct Use of CN4Y PAC YU25HT Heater is off Fan Fan OFF AN f a heater is installed in the duct do not use CN4Y By doing so the fan will turn off when the heater is on which may result in fire 1 Fan speed setting Setting Setting Initial setting Heating Thermo OFF DEFROST or ERROR Very low Very low Fan contro STOP Remote controller setting Remote controller setting Remote controller setting 5 83 Refer to the Installation Manual for function settings 18 6 3 PAC YU25HT Optional Parts installation The following section describes installation of the External Heater Adapter that connects to SEZ KD NA series indoor unit This products is the special wiring parts to drive an electric heater with 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 inclu
44. r type Motor output Driving mechanism Airflow rate Low Mid High o 7 gt 2 00 4 C x r O lt o zo Min size of wire 5 3 3 3 5 El 3 Refrigerant piping diameter Drain piping diameter i gt 2 3 3 Document Accessory Remark SOUND CRITERION CURVES o o o o o o 8 H H E 8000 8000 4000 2000 4000 BAND CENTER FREQUENCIES Hz 2000 ii F XZ Z Patt as HEARING FOR ERESHOLD OF HEARING FOR Ha CONTINUOUS PROXIMAT CONTINUOUS k X 1 E T External static pressure SEZ KDO9NA 4 External static pressure 0 20 in WG 50Pa 63 SEZ KDO9NA 4 0 06 in WG 15Pa o o o o o o B H M MIO eed ede ede edle eel 60Hz 8000 60Hz 8000 4000 4000 2000 2000 BAND CENTER FREQUENCIES Hz 2 lb a lt OW e 3E E 2 Lu lt m am I O E O 2 1000 CHUA d W4 ode 500 BAND CENTER FREQUENCIES Hz 5 5 2 i WOO lt L qc 8 APE aA 8 gt LO sot tO x992 zz zz Q P UILU a 2 zn oO 5 O 5 56606 C 0 lt 2 C Qn lt TOZ a s x c c x c c Xa T u N N
45. rking D Freezing protection Cooling mode The unit is in six minute resume prevention mode if pipe liquid or condenser evap orator temperature stays under 15C 5 F for three minutes after the compressor started Abnormal if it stays under 15 C 5 F 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 C 158 F after the compressor started Abnormal if the temperature of over 70 C 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 TH TH1 TH Lower temperature between liquid pipe temperature TH2 and con denser evaporator temperature TH5 TH1 Intake temperature 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
46. rt circuited Defective indoor controller Operate with connector CN4F short circuited Constantly detected during operation board Replace indoor controller board if abnormali ty reappears Drain overflow protection operation Malfunction of drain pump Check if drain up machine works D Suspensive abnormality if drain float Defective drain Check drain function switch is detected to be underwater for 1 Clogged drain pump minute and 30 seconds continuously Clogged drain pipe with drain pump on 3 Defective drain float switch 3 Remove drain float switch connector CNAF Turn off compressor and indoor fan Catch of drain float switch or and check if it is short Switch On with the Drain pump is abnormal if the condition malfunction of moving parts moving part of float switch UP or OPEN with above is detected during suspensive cause drain float switch to be the moving part of float switch down abnormality detected under water Switch Replace float switch if it is short with the Constantly detected during drain pump On moving part of float switch down operation Defective indoor controller Replace indoor controller board if it is short board circuited between of the drain float switch connector CNAF and abnormality reappears It is not abnormal if there is no problem about the above mentioned O Turn the power off and on again to operate after check 25 Freezing overheating protection is wo
47. supply of rated voltage is not supplied to out door unit 2 Defective outdoor controller circuit board Power supply of 208 230V is not supplied to indoor unit Defective indoor controller board 2 LED2 on indoor controller board is blinking Connection failure of indoor outdoor unit connecting wire When LED1 is lit Mis wiring of remote controller wires Under twin triple indoor unit system 2 or more indoor units are wired together Refrigerant address for outdoor unit is wrong or not set Under grouping control system there are some units whose refrigerant address is O 8 Short cut of remote controller wires Defective remote controller 29 D Check the voltage of outdoor power supply terminal block L N or Ls N e When AC 208 230V is not detected Check the power wiring to outdoor unit and the breaker e When 208 230V is detected Check 2 below 2 Check the voltage between outdoor terminal block S1 and S2 e When AC 208 230V is not detected Check the fuse on outdoor controller circuit board Check the wiring connection e When AC 208 230V is detected Check below Check the voltage between indoor terminal block S1 and S2 e When AC 208 230V is not detected Check indoor outdoor unit connecting wire for mis wiring e When 208 230V is detected Check below Check the fuse on indoor controller board Check the wiring connection
48. y the relay manufacturer at both ends of the relay coil The length 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 Wiring diagram 4 Wiring restrictions 208V 230V 60Hz Control board FS1 R m JUL S _ 88H FS2 FS1 D P 8H FS2 88H CN24 FS1 2 Thermal fuse H1 H2 Heater 26H Overheat protection thermostat 88H Electromagnetic contactor Keep the length of the cable connecting to the circuit board of the indoor unit shorter than 10 meters 32ft Longer than 10 meters 32ft could cause improper operation Use a transit relay when extending wiring such as remote wiring 20 7 TROUBLESHOOTING 7 1 CAUTIONS ON TROUBLESHOOTING 1 Before troubleshooting check the followings D Check the power supply voltage 2 Check 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 When removing the indoor controller board hold the edge of the board with care NOT to apply stress on t
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