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SERVICE MANUAL

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2. Aux duct Front side 3 1 4 ft Measurement location 5 2 NC curves PVA A30AA4 External static pressure 0 30 in WG 75Pa PVA A36AA4 External static pressure 0 30 in WG 75Pa 700 ooo eee 70 0 a High 222222 5 65 0 65 0 60 0 60 0 c c NC 60 NC 60 5 550 5 55 0 q q m 50 0 m 50 0 2 ANIN NC 50 X NC 50 m 45 0 m 45 0 5 400 40 0 m NC 40 Basis NC 40 5 350 5 35 0 o L o o o amp 30 0 amp 30 0 NC 30 g NC 30 S 250 S 25 0 gt gt 200 5 20 0 L r Approximate minimum r Approximate minimum 45 0 audible limit NG 20 45 0 audible limit on NC 20 22 continuous noise L continuous noise 10 0 10 0 63 125 250 500 1k 2k 4k 8k 63 125 250 500 1k 2k 4k 8k Octave band center frequencies Hz Octave band center frequencies Hz External static pressure 0 50 in WG 125Pa External static pressure 0 50 in WG 125Pa 65 0 EN Middle 65 0 ES Middle 60 0 A S 60 0 S 5 DN NM S NC 60 LN 21 NC 60 5 550 SN 5 550 EX oO KN o BE
3. OUTDOOR UNIT I z m mmg B BLACK BLUE CN2C CN24 2 CN51 BLUE CNXB2 LED CNXA2 WITCH T E SW ew 9 ir 3 zi BLUE 2 al feel ts evel ER nn ON ON J fl 12345 12345 12345678 SYMBOL EXPLANATION FAN MOTOR NAME NAME SYMBOL NAME Note1 Since the outdoor side electric wiring may change be sure INDOOR CONTROLLER BOARD INDOOR CONTROLLER BOARD OPTIONAL PARTS to check the outdoor unit electric wiring for servicing CN24 1 CONNECTOR HEATER CONTROL 1ST SWITCH FOR MODEL SELECTION W B IRWIRELESS REMOTE CONTROLLER BOARD 2 Indoor and outdoor connecting wires are made with CN24 2 CONNECTOR HEATER CONTROL 2ND SWITCH FOR CAPACITY CODE RU RECEIVING UNIT polarities make wiring matching terminal numbers CONNECTOR HUMIDITY OUTPUT SWITCH FOR MODE SELECTION 71 BUZZER 51 52 53 CONNECTOR 0 10V ANALOG INPUT CONNECTOR EMERGENCY OPERATION LED1 LED RUN INDICATOR 3 Symbols used in wiring diagram above are as follows CONNECTOR ERV OUTPUT POWER SUPPLY BOARD SW1 SWITCH HEATING ON OFF CONNECTOR CONNECTOR LOSSNAY SW2 SWITCH COOLING ON OFF TERMINAL CONNECTOR REMOTE SWITCH ZNROI 2 V RB WIRED REMOTE CONTROLLER BOARD HEAVY DOTTED LINE FIELD WIRING CONNECTOR HA TERMINAL A TE MNAL BLOG THIN DOTTED LINE OPTIONAL PARTS
4. 0 60 Airflow rate m3 min cfm 40 1412 43 1518 e Downflow Static pressure Pa in WG Static pressure Pa in WG Static pressure Pa in WG 100 0 40 75 0 30 50 0 20 External static pressure 0 30 in WG 75Pa 208 230V 60Hz loans ceu kas densos d normes iie Sy ipay y akar gies COSTES ee ee I tei be a NS ee eee AS oe tl ee hI ee ee Se Sloe ee eee SI ee ood ee seem aues 0 0 26 30 35 40 43 918 1059 1236 1412 1518 Airflow rate m3 min cfm External static pressure 0 50 in WG 125Pa 208 230V 60Hz 75 0 70 E NENNEN TN ae 0 90 puso ee 35 1236 Airflow rate m3 min cfm 40 1412 43 1518 External static pressure 0 70 in WG 175Pa 208 230V 60Hz 43 1412 1518 Airflow rate m3 min cfm PVA A30 36 42AA4 Air filter Power source 208 230V 60Hz External static pressure Pa in WG 25 0 100 20 0 080 15 0 060 10 0 040 5 0 020 0 A36 42 A30 0 10 20 30 40 50 0 353 706 1059 1412 1766 Airflow rate m3 min cfm 5 SOUND PRESSURE LEVELS 5 1 Sound pressure level Ceiling concealed
5. CONNECTOR CENTRALLY CONTROL AUX RELAY REMOTE CONTROLLER TRANSMISSION LINE d CONNECTOR WIRELESS INTAKE AIR TEMP THERMISTOR 4 Use copper supply wire PPE TEMP THERMISTORILIQUID UTILISER DES FILS D ALIMENTATION EN CUIVRE CNF CONNECTOR HUMIDITY INPUT ER LOCK LED POWER SUPPLY INDDOR OUTDOOR CONNECTING LINE LED REMOTE CONTROLLER SUPPLY 7815 TERMINAL BLOCK LED TRANSMISSION INDOOR OUTDOOR REMOTE CONTROLLER TRANSMISSION HE C Ri RADO FREQUENCY INTERFACE FOR RF THERMOSTAT 14 REFRIGERANT SYSTEM DIAGRAM PVA A30 36 42AA4 Strainer 50 Heat exchanger Refrigerant GAS pipe connection Flare Refrigerant flow in cooling Refrigerant flow in heating Refrigerant LIQUID pipe connection Flare Thermistor TH5 Cond Eva temperature Thermistor TH2 Pipe temperature Liquid Thermistor TH1 Room temperature Distributor with strainer 50 15 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 Wired remote controller RF thermostat Heater Enable heater 1st Heater
6. 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 1 phase s power supply 208V 230V 60Hz Wiring diagram s FS1 2 Thermal fuse H1 H2 Heater 26H Overheat 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 32ft Longer than 10 meters 32ft could cause improper operation Use a transit relay when extending wiring such as remote wiring 18 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 i thermostat 13 113 16 116 n OFF Hea operation amp Thermo OFF OFF RC setting st Heat operation amp Thermo ON Heat operation amp Thermo ON OFF RC setting a 8 Heat operation amp Thermo Heat operation amp Thermo ON High Hemote The fan continues to run for 30 seconds a
7. is displayed c d Noise 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 D Two remote controller are set D 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 Remote controller receives transmitted 2 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 0 6 Diagnose remote controller s 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 Defective transmitting receiving 2222 ee E3 Error code E5 circuit of indoor controller Turn the power off and on again to check Or 2 Indoor controller board receives trans board 1 217 PON L AS E5 mitted data at the same time compares Noise has entered into t
8. Correct operation 22 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 O 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 23 BENE oO Note Refer to the manual of outdoor unit for the details of display 12 3 SELF DIAGNOSIS ACTION TABLE such as F U and other E Check resistance value of thermistor oC 32 F 15 0kQ 10 C 50 F 9 6kQ 20 C 68 F 6 3kQ 30 C 86 F 4 3kQ 40 C 104 F 3 0kQ If you put force on draw or be
9. O lt 4 FAN PERFORMANCE AND CORRECTED AIR FLOW 4 Vertical Horizontal Right Horizontal Left Static pressure Pa in WG Static pressure Pa in WG Static pressure Pa in WG 75 eben pedea e ee External static pressure 0 30 in WG 75Pa 208 230V 60Hz 0 30 50 0 20 20 25 29 706 1024 Airflow rate m3 min cfm External static pressure 0 50 in WG 125Pa 208 230V 60Hz 0 60 125 mud NA ME 0 50 100 0 40 75 0 30 50 0 20 25 0 10 45 530 20 25 29 706 Airflow rate m3 min cfm 0 90 200 External static pressure 0 80 in WG 200Pa 208 230V 60Hz 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 75 0 30 50 0 20 25 0 10 0 15 20 25 29 706 1024 Airflow rate m3 min cfm External static pressure 0 50 in WG 125Pa 208 230V 60Hz 227 0 60 125 0 50 100 0 40 75 0 30 50 0 20 20 25 28 706 883 989 Airflow rate m3 min cfm External static pressure 0 80 in WG 200Pa 208 23
10. 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 the components When connecting or disconnecting the connectors hold the housing of the connector DO NOT pull the lead wires X O 15 Lead wires Housing point 21 12 2 SELF CHECK FUNCTION 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 INDICATOR lamp flashes Check code Number of times P1 lhtakesenoremor C P2 P9 Pipe Liquid or 2 phase pipe sensor error E6 E7 Indoor outdoor unit communication error Pa Dmisemoremr OO E FieezngOvemesingsafeguardoperalon EE Communalnemorbetweenindoorandoudoorunts o o PP Pmetempemueemr O 7 SSS n _ L i i i 12 Indoor unit control system error memory error etc No sound 7 BENE Output pattern B Errors detected by unit other than indoor unit outdoor unit etc Wired remote controller Beeper sounds OPERATION Symptom INDICATOR lamp flashes Check code
11. e On wired remote controller Check code displayed on the LCD 10 e 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 Pans 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 i 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 WAN Eros Ater a miii Only LED 1 is lighted gt LED 1 2 blink Reverse or open phase wiring for the outdoor unit s power utes has expired terminal block L1 L2 L3 Display messages do not appear pat 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 81 82 3 twice LED 2 blinks once e Remote controller wire 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 possible for about 30 seconds after cancellation of function selection
12. er eo vVVcYV VAd 9 86 629 96 8 1 SLX9V L Z2 LXvexoo VVVoVNV VAd ZOVX6LS v SZX9 609X80S PV V9EV VAd 9S 91 6 81 91 LE 01 6 2 91 L 62 v L vs 1 01 8 1 91 ove L 84 v VNVOEV EHE Gec6 Z 8 6 9990 9286 7 7 VVOEV VAd eddpmbrpeddseo r H 9 Jd a d 9 a v 8 1 SLX9L E 4 84 ZOVXLLY v SZX80SX80S uonoeuuoj JONG ezis Spon VVVOEV WAd ares r KA 4 2225 SA ESS KIDS 2 5666 Z 40040240 856600460 sa 040060 222 BSS 006699 gt 2 004 lt gt ia 55 2 25 SS 2505 A NM 5 55 25252529 25255 lt gt 2 24222 S RRIS 926264 2555 0 252552550 52506 505050050605 5555659 15552505500 54 0000606050 J 4 4 20 0 5 4 d 255 2222 gt lt 5 25252504 22 52555604 5252506 lt XS 0505 BEER eS A lt x 5 60000600006 529 255 xe 25 2525 Z lt gt lt lt 5 o o 5 lt KX 950 RS S oS XXX 49 JI v 6 V q 1 Ldanv e 20 610 Idae V 6 S0 618 pip Ane ge 909 08 edid ldd v e 6 90619
13. kQ Temperature 31 nmn C S S l l S 12 8 DC FAN MOTOR FAN MOTOR INDOOR CONTROLLER BOARD Check method of DC fan motor fan motor indoor controller circuit board 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 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 I B Replace fan motor MF Did the fuse blow Yes gt 4 No Y Wiring contact check No Contact of fan motor connector CNMF Y Replace drain pump DP Is there no contact failure gt gt y Yes Power supply check Remove the connector CNMF Measure the voltage in the indoor controller circuit board TEST POINT Voc between 1 and 3 of the fan connector Voc DC310 340V TEST POINT O Vcc between 4 4 and 3 of the fan connector Vcc DC15V Y Is the voltage normal Yes Measure the resistance of the fan motor 4 Replace indoor Is the resistance
14. of the fan motor N No controller board normal Refer to below table OK 4 Yes Check the operation gt END Does the fan motor rotate smoothly V NG 4 Yes No Turn OFF the power supply and connect the connector CNMF Turn ON the power supply and Replace the fan motor measure the voltage of connector CNMF while rotaing the motor by the hand Y Does the voltage between pin 6 and pin 3 gt Noo Replace the fan motor of connector CNMF repeat OV and 5V V Yes OK Y Yes OK Check the operation of fan Check the operation of fan Replace indoor controller board Replace indoor controller board 4 PVA A36 42AA4 L pin 4 pin 3 50kQ 47kQ pin 5 pin 3 150kQ 143kQ To measure the resistance connect the negative end of the tester to pin 3 32 12 9 FUNCTIONS OF DIP 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 Model settings Capacity settings Pair number setting with wireless remote controller Unit type setting Indoor controller board type setting For service board 4 PVA A36AA4 PVA A42AA4 Wireless r
15. 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 for R410A Use pressure performance of 5 09MPa G or over Refrigerant cylinder Only for R410A Top of cylinder Pink Cylinder with syphon 2 PART NAMES AND FUNCTIONS e Indoor Unit 1 Vertical 2 Horizontal Right Air J outlet Air inlet 3 Horizontal left 4 Down flow Air inlet Service Ref PVA A30AA4 Power supply phase cycle voltage 1 phase 60Hz 208 230V 15 Min Circuit Ampacity 4 13 External finish Galvanized steel cabinet Powder coated Slate Gray Heat exchanger Plate fin coil Fan m min Pa in WG Operation control amp Thermostat Sound pressure level 75Pa 0 30 in WG 30 34 38 Low Mid High 125Pa 0 50 in WG dB A 32 36 40 200Pa 0 80 in WG 35 39 43 19 05 3 4 FPT z 2 lt A A W Airflow Low Mid High 75 125 200 0 30 0 50 0 80 INDOOR UNIT Sound pressure level 30 34 38 Low Mid High 32 36 40 37 41 45 I 19 05 3 4 FPT mm in Power supply phase cycle voltage External static pressure Sound pressure level 75Pa 0 30 in WG 34 38 42 Low Mid High 125Pa 0 50 in WG 36 40 44 39 43 47 Dimensions OO o D mia O H mqg mmn tett 59 2 78 172 z gt oc O
16. the indoor controller 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 or 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 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 short circuited Defective indoor con
17. 0 SM LION NEN NN MCN RT _ l 0 10 20 25 30 35 37 706 883 1059 1236 1306 Airflow rate m3 min cfm External static pressure 0 80 in WG 200Pa 208 230V 60Hz RN NE a AER UNE Static pressure Pa in WG 37 1236 1306 Airflow rate m3 min cfm 42 4 Vertical Horizontal Right Horizontal Left Static pressure Pa in WG Static pressure Pa in WG Static pressure Pa in WG 75 Sock coe secon Sale coke Sle m sos So S ss th Kakaku External static pressure 0 30 in WG 75Pa 208 230V 60Hz Newbie oak ae ee he SD ea ey ee tope 0 30 50 0 20 25 0 10 a eee pe pay ee eee ee Ie Poise S Ane ee See esa Si ne 35 40 1236 1412 Airflow rate m3 min cfm He dem esse de elu See eS We eee pees 45 47 1589 1660 0 60 125 External static pressure 0 50 in WG 125Pa 208 230V 60Hz 0 50 100 0 40 30 35 40 44 1059 1236 1412 1554 Airflow rate m3 min cfm 0 90 200 External static pressure 0 80 in WG 200Pa 208 230V 60Hz 0 80 175 0 70 150
18. 0V 60Hz 0 90 x 200 0 80 175 0 70 150 0 60 20 25 27 883 953 Airflow rate m3 min cfm PVA A36AA4 e 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 25 0 10 0 20 25 30 35 37 1059 1236 1306 Airflow rate m3 min cfm External static pressure 0 50 in WG 125Pa 208 230V 60Hz 0 50 100 0 40 75 0 30 50 0 20 25 0 10 20 25 30 35 37 706 883 1059 1236 1306 Airflow rate m3 min cfm External static pressure 0 80 in WG 200 208 230V 60Hz C l eee 25 30 35 37 1236 1306 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 040 1 ead 75 0 30 50 0 20 25 0 10 Gl 2 43 2 4 2 dui 4X 3 EE n 0 20 25 30 35 37 706 883 1059 1236 1306 Airflow rate m3 min cfm External static pressure 0 50 in WG 125Pa 208 230V 60Hz 0 60 Sp 125 0 50 100 0 40 75 0 30 50 0 2
19. If there is no problem with the action above transmission from indoor unit of refriger this case EO is displayed on Check Min of UI convene ant address 0 for three minutes remote controller and E4 is 2 2 oe ee displayed al LED LEDT LED2 e The number of connecting indoor units Abnormal if sub remote controller could on the outdoor controller circuit max euniis not receive for any signal for two min board number of connecting remote con utes Error code EO Mis wiring of remote controller troller max 2units 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 O 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 OK 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 When RC is displayed c d When ERC 00 06
20. MITSUBISHI Changes for the Better a ELECTRIC SPLIT TYPE HEAT PUMP AIR CONDITIONERS 2015 R410A SERVICE MANUAL Model name lt Indoor unit gt PVA A30AA4 PVA A36AA4 PVA A42AA4 INDOOR UNIT SLIM CONTENTS 4 SAFETY PRECAUTION ssa rere R ama wasu qe 2 2 PART NAMES AND FUNCTIONS IH nnn 3 2 SPECIFICATION 4 4 FAN PERFORMANCE AND CORRECTED AIR FLOW MM 6 5 SOUND PRESSURE LEVELS equa euo esee REESE a 10 6 OUTLINES amp DIMENSIONS odi ctor pee nue uet des 12 T WIRING DIAGRAM l ito cue ka did hasa 14 8 REFRIGERANT SYSTEM DIAGRAM mmm IRI rmn 15 9 HEATER CONTROL 55 einn aq aquikaqkusazshakuhapushakakakhiuausascks 16 10 HUMIDIFIER CONTROL 5 55 nt o tuse sensato im 19 11 ERV ENERGY RECOVERY VENTILATION CONTROL HHMRH B e eSl 20 1 TROUBLESHOOTING UE Sete I Ese eU DU EU uu uuu D DU uds 21 13 DISASSEMBLY PROCEDURE nn 34 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 R410A Use new refrigerant pipes In case of using the existing pipes for R22 be c
21. Number of times 1 E9 Indoor utdoor unit communication error Transmitting error Outdoor unit 7 Ub Gampeserwemurenempl 5 usus Opewshotofodooruntihemstos 4 ur Compressorovercumentinenupion When compressor 5 uz Aonormalhigh dischargng tempersturelSO worked insufficient refrigerant 686 UtUd Abnormal high pressure 63H worked Overheating safeguard operation Abnormal temperature of heat sink For details check the LED x us outioor unit fa protection stop splay of outdoor controller rl a 9 Compressor overcurrent interruption Abnormal of power module board 11 09 UH synchronous signal to main circuit Current sensor error 55222222727 14848 1 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 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 On IR wireless remote controller The continuous buzzer sounds from receiving section of indoor unit Blink of operation lamp
22. OFF 1 control basic control Inlet air temp 2 set temp 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 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 Enable heater Heater OFF Initial setting comfort mode Inlet air temp gt set temp Heater ON Inlet air temp lt set temp 1 8 F 1 C The fan will stop and the heater will turn off when DEFROST is displayed Set temp Inlet air temp Room temperature setting i Set temp 1 8F 1C Heater output ON OFF 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 intet air temp Set temp 1 8F 1C Set temp 2 7F 1 5C Heater output economy mode Inlet air temp set temp 1 8 F 1 C Heater ON Inlet air temp set temp 3 6 F 2 C The 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 neta temp Set temp 1 8F 1C Set
23. PN q ON m 50 0 m 50 0 L S S E NC 50 NC 50 m 45 0 m 45 0 LN o 9 400 9 400 2 E 2 NC 40 NC 40 5 35 0 5 35 0 pu Iw Q 000707702540 o Oe ll eek gt amp 30 0 lt A a 30 0 Buc po c A NC 30 NC 30 S 250 ON _ S 250 Tips coin e e gt or c bos coe 0 gt 222 752 8 200 Approximate Approximate minimum 150 E audible limton NC 20 150 audible limit on NC 20 E continuous noise E continuous noise 10 0 10 0 63 125 250 500 1k 2k 4k 8k 63 125 250 500 1k 2k 4k 8k Octave band center frequencies Hz Octave band center frequencies Hz External static pressure 0 80 in WG 200 External static pressure 0 80 in WG 200Pa 65 0 E 65 0 60 0 60 0 NC 60 5 55 0 550 o o N N q UM d 50 0 d 50 0 S d NC 50 m 45 0 m 45 0 i 5 m gt C YN ees 2 Basa 9 400 400 lt _ lt 90 2 NC 40 E o _ _ 5 35 0 5 35 0 o o o o amp 30 0 30 0 NC 30 E 8 250 amp 250 gt pe 8 200 8 200 NC 20 Appr
24. act failure of connector 2 Check contact failure of connector CN44 tection mode if short open of thermistor CN44 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 healing restart after utes The Danse duis rom Opals failure of thermistor eee Operate in test run mode and check pipe tion if It has normally reset Temperature of thermistor is lt condenser evaporator gt temperature Constantly detected during cooling dry 90 C 194 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 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 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 troller can not receive normally any as sub remote controller In
25. areful 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 refrige rant can cause deterioration of refrigerant oil etc Use a vacuum pump with a
26. ating 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 Low load low temperature operation beyond the tolerance range Defective indoor fan motor e Fan motor is defective e Indoor controller board is defective Cooling or drying mode Check clogging of the filter 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 2 Short cycle of air path 8 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 12 8 DC Fan motor FAN MOTOR INDOOR CONTROLLER BOARD Check out
27. 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 12 6 TROUBLE CRITERION OF MAIN PARTS PVA A30AAA PVA A36AA4 PVA A42AA4 Check method and criterion Room temperature Measure the resistance with a tester a Part temperature 10 C 50 F 30 C 86 F Pipe temperature thermistor liquid 4 3kQ 9 6kQ 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 12 7 Thermistor Thermistor Characteristic graph temperature thermistor TH1 Pipe temperature thermistor TH2 Condenser evaporator temperature thermistor TH5 lt Thermistor for lower temperature gt Thermistor 15 3 Fixed number of B 3480 296 1 Resistance KQ 1 Ht 15 3480 7 7 7573 09 15 10 C 9 6 20 C 6 3 kQ 25 C 5 2 20 10 0 10 20 30 40 50 30 4 3 4 14 32 50 68 86 104122 F 3 0
28. controller board CNXC1 Connect to the indoor controller board CNXA2 Connect to the indoor power board CNXB2 Connect to the indoor power board CNXC2 4 Connect to the indoor power board 1 Vra Voltage on the side of PC51 and C25 Same with the voltage between 7 and 4 of CNMF Vcc 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 CNXB1 CNXC1 CNXA1 PC51 ig C25 C 6 CNMF 29 12 5 2 Indoor controller board PVA A30AA4 PVA A36AA4 PVA A42AA4 fes e e KE N EBTSSC01 e 00 4 an 8 ae ut CN32 eo 4 SWE 30 CNXA2 CNXC2 CNXB2 CN51 SWE Emergency operation SW1 Model selection SW2 Capacity setting CN105 Radio frequency interface CN32 Remote start stop adapter CN22 ForMA remote controller cable con nection 10 13 VDC CN51 Centralized control CN41 JAMA standard HA terminal A CN44 Thermistor liquid condenser evaporator temperature CN4F Float sensor 20 Thermistor Inlet temperature CN24 1 1st Heater control 12VDC CN24 2 2nd Heater control CNAY For fan control Indoor outdoor transmission 0 24VDC CN90 Wireless remote controller CNXA2 Connect to the indoor controller
29. door fan motor 5 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 e Shortage of refrigerant temperature check with outdoor Check pipe liquid or condenser evaporator temperature with room temperature display on remote controller and outdoor controller circuit board e Disconnected holder of pipe liquid or condenser evaporator thermistor Defective refrigerant circuit Converse connection of extension pipe on plural units connection Converse wiring of indoor outdoor unit connecting wire on plural units connection 4 Defective detection of indoor room temperature and pipe condenser evaporator temperature thermistor Stop valve is not opened completely controller circuit board after connecting A Control Service Tool PAC SK52ST Check converse connection of extension pipe or converse wiring of indoor outdoor unit connecting wire 25 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 three minute resume pro Cont
30. emote Control PCB setting controller setting o x o 1 X O 2 O x WithoutTH5 O With TH5 X Indoor controller board type JP3 Factory shipment Q Service parts 33 Settings at time of factory shipment Wireless remote controller 0 Control PCB O for both J41 and J42 Four pair number settings are supported The pair number settings of the wireless remote controller and indoor control PCB J41 J42 are given in the table on the left x in the table indicates the jumper line is disco nnected There is no jumper JP1 because these models have the cond eva temperature thermistor TH5 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 40 Fig 1 Fig 2 34 2 Thermistor Return Air Exercise caution when removing 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 35 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 sec
31. fter the humidifier stops 10 2 INSTALLATION A basic connection method is shown below Indoor unit control board o _ 2 F SVA Humidifier Pa Humidistat On site preparation Use XA 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 19 11 ERV ENERGY RECOVERY VENTILATION CONTROL 11 1 CONTROL SPECIFICATIONS The below table shows how the field installed E RV is controlled ERV output Condition Fan speed CN2C output CNER input Fan output Cool Heat Fan operation RC setting Defrost STOP IEEE 11 2 INSTALLATION A basic connection method is shown below Indoor unit control board o gt 9 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 20 12 TROUBLESHOOTING 12 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
32. 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 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 0 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 27 I R R P n s 12 4 TROUBLESHOOTING BY INFERIOR PHENOMENA Note Refer to the manual of outdoor unit for the detail of remote controller Phenomena Cause Coun
33. nd the lead wire with measuring resistance value of thermistor breaking of wire or contact failure can be detected Room temperature Defective thermistor thermistor TH1 characteristics D The unit is in three minute resume 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 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 4 Check room temperature display on remote controller Heplace 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 Contact failure of connector Check contact failure of connector CN44 on prevention mode if short open of CN44 on the indoor controller
34. nditioner 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 connector 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 17 2 3 Locally procured wiring A basic connection method is shown below ER Indoor unit Remote control board Relay circuit Adapter control board Se Ts T CN24 1 or CN24 2 dE ii 8 I Q2 8 i Il Electric Heater or panel I 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
35. oximate minimum 15 0 L audible limit on 15 0 audible limit continuous noise 722 continuous noise 10 0 100 63 125 250 500 1k 2k 4k 8k 63 125 250 500 1k 2k 4k 8k Octave band center frequencies Hz 10 Octave band center frequencies Hz 42 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 75Pa 70 0 NC 60 NC 50 NC 40 NC 30 Nc 20 15 0 audible limiton continuous noise Em 10 0 63 125 250 500 1 2k 4k 8k Octave band center frequencies Hz External static pressure 0 50 in WG 125Pa Approximate minimum audible limit on continuous noise 63 125 250 500 1k 2k 4k 8k Octave band center frequencies Hz External static pressure 0 80 in WG 200Pa 65 0 60 0 55 0 50 0 45 0 40 0 35 0 30 0 25 0 20 0 Approximate minimum 15 0 audible limit on continuous noise 10 0 63 125 250 500 1k 2k 4k 8k Octave band center frequencies Hz NC 40 11 91 22 z L Lv 01 2 1 2 L 69 1 21 8 1 61 Kot
36. rans 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 26 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 Abnormal if indoor controller board indoor outdoor unit connecting PAC SK52ST cannot receive any signal normally for wire Refer to EA EC item if LED displays EA EC six minutes after turning the power on 2 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 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 2 2 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
37. 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 phase 3 Service tools Use the below service tools as exclusive tools for R410A
38. te 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 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 are 0 in one group set one of the units to 0 using SW1 3 6 on outdoor Short cut of remote controller wires controller circuit board Defective remote controller 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 28 12 5 TEST POINT DIAGRAM 12 5 1 Power supply board PVA A30AA4 PVA A36AA4 PVA A42AA4 CND Power supply voltage 208 230VAC CNMF Fan motor output 1 4 310 340 VDC 5 4 15 VDC 6 4 0 6 5 VDC 7 4 Stop 0 or 15 VDC Run 7 5 VDC 0 15 pulse CAUTION FOR ELECTRIC SHOCK CNXA1 Connect to the indoor controller board CNXB1 Connect to the indoor
39. temp 4 5F 2 5C Heater output ON L L _ OFF 1st Heater output from CN24 1 yellow on the indoor unit control board 2nd Heater output from CN24 2 blue on the indoor unit control board Refer to the Installation Manual for function settings Enable heater Heater OFF 2 2 16 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 a 123 than defrost setting Disabled DEED STOP Heater OFF Set Heater LEN CN4Y cannot be used with this unit 2 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 4 series indoor unit This products is the special wiring parts to drive an electric heater with the air co
40. termeasure 1 LED2 on indoor controller board When LED1 on indoor controller board is also off is off Power supply of rated voltage is not supplied to out D 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 e When AC 208 230 is detected Check below 2 Defective outdoor controller circuit board 2 Check the voltage between outdoor terminal block 51 and S2 e When AC 208 230 is not detected Check the fuse on outdoor controller circuit board Check the wiring connection e When AC 208 230 is detected below 8 Power supply of 208 230V is not supplied to indoor Check the voltage between indoor terminal unit block S1 and S2 e When AC 208 230 is not detected Check indoor outdoor unit connecting wire for mis wiring e When AC 208 230 is detected Check 4 below 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 indoor outdoor unit connecting for connection failure wire e When LED1 is lit Mis wiring of remote controller wires D Check the connection of remo
41. troller Operate with connector short circuited Constantly detected during operation board Refer to 12 5 Replace indoor controller board if abnormality reappears P4 5701 24 Freezing overheating protection is working 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 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 C 158 after the compressor started Abnormal if the temperature of over 70 C 158 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 2 TH TH1 TH Lower temperature between liquid pipe temperature TH2 and con denser evaporator temperature TH5 TH1 Intake temperature He
42. uring it to the 3 smaller panels for refrigerant and drain lines 3 Slide the smaller panels in the directions indicated and remove 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 w 5 Remove the plate covering the coil assembly to access the thermistors A Fire Re Haas lt U MR 579 DETAIL Fig 9 DETAIL A 6 Remove lower and side drain pan Fig 10 37 BEN 4 Blower Fan Assembly Exercise caution when removing heavy parts 1 Remove the Blower and Filter panel along with P filter if installed indicated in section 2 2 Remove the 1 or 2 brackets that secure the coil assembly Fig 11 3 Remove the 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 38 MITSUBISHI ELECTRIC CORPORATION http Global MitsubishiElectric com New publication effective Feb 2015 HWE1406A Specifications subject to change without notice

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