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Mitsubishi Electric Mr.Slim PCY-P18KA.TH, Service Manual, Page: 35 / 38

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Mitsubishi Electric Mr.Slim PCY-P18KA.TH Service Manual Download Page 35

OPERATING PROCEDURE

PHOTOS & ILLUSTRATIONS

35

Photo 12

Under panel fixing 

screws

10. Removing the drain pan 

(1) Remove the air intake grilles. (See Figure 1, 2)

(2) Remove the side panels (right and left). (See Figure 4, 5)

(3) Remove the under panel. (See Photo 12)

(4) Remove each drain pan fixing screw (4 

×

 10 ST) (right 

and left). (See Photo 13)

(5) Remove 2 insulations in the centre of the drain pan, 2 

washer-based screws, and then the drain pan. (See 

Photo 14, 15)

<Caution>

Beware of some drainage that may remain in the drain 

pan when you remove the drain pan.

Auto vane

Insulations

Washer-based screw

(2 locations)

Photo 13

Drain pan fixing 

screw (right and 

left sides, each 

with 1 screw)

Drain pan

Pipe cover fixing screws

Photo 14

Photo 15

9. Removing the under panel

(1) Remove the air intake grilles. (See Figure 1, 2)

(2) Remove the side panels (right and left). (See Figure 4, 5)

(3) Remove the beam. (See Photo 1)

(4) Remove the electric box cover. (See Photo 1)

(5) Pull down the electric box. (See Photo 2)

(6) Remove the wireless receiver connector (CN90) and the 

clamp and the cable strap that hold the connector.

(7) Remove 8 under panel fixing screws (4 

×

 10 ST) and 

remove the under panel by sliding approx. 10 mm to the 

front.

<Caution>

Hold the under panel by hand to avoid it from falling.

For safety reasons, this procedure must be performed 

by two persons.

11. Removing the thermistors/Liquid pipe (TH2) and con-

denser/evaporator (TH5)

(1) Remove the air intake grille. (See Figure 1, 2) 

(2) Remove the left and right side panels. (See Figure 4, 5)

(3) Remove the under panel. (See Photo 12)

(4) Remove the drain pan. (See Photo 13, 14, 15)

(5) Disconnect the connector CN44 (white) from the indoor 

controller board.

(6) Remove 6 screws from the pipe cover and remove the 

pipe cover. (See Photo 13, 16)

(7) Remove the fastener for wires and remove the thermistors 

(TH2 and TH5) from each holder. (See Photo 17)

Photo 16

Pipe cover

Pipe cover fixing 

screws

Pipe cover 

fixing screws

Fastener

Photo 17

Liquid pipe 

temperature 

thermistor (TH2)

Condenser/evaporator 

tempertature thermistor 

(TH5)

OCH550A

Summary of Contents for Mr.Slim PCY-P18KA.TH

Page 1: ...e This manual describes ser vice data of the indoor units only RoHS compliant products have G mark on the spec name plate PARTS CATALOG OCB550 Model name indication WIRED REMOTE CONTROLLER WIRELESS REMOTE CONTROLLER ON OFF TEMP ON OFF TEMP Series PCY Indoor unit Model Name PCY P18KA PCY P24KA PCY P30KA PCY P36KA PCY P42KA PCY P48KA Service Ref PCY P18KA TH PCY P24KA TH PCY P30KA TH PCY P36KA TH PC...

Page 2: ...NICAL DATA BOOK REFERENCE MANUAL 1 Service Ref Service Manual No SUY KA18 24 30 36VA TH OCH552 OCB552 PUY P42 48VKA TH T PUY P42 48YKA TH T OCH558 OCB558 Series Outdoor unit Data Book No SUY KA VA TH OCS27 PUY P VKA TH PUY P YKA TH OCS29 OCH550A ...

Page 3: ... with R410A refrigerant The following tools are necessary to use R410A refrigerant 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 Flare tool Electroni...

Page 4: ... check Attach on vacuum pump 6 Refrigerant charge base 7 Refrigerant cylinder Only for R410A Top of cylinder Pink Cylinder with syphon 8 Refrigerant recovery equipment 1 Cautions for service 1 Perform service after recovering the refrigerant left in unit completely 2 Do not release refrigerant in the air 3 After completing service charge the cycle with specified amount of refrigerant 4 When perfor...

Page 5: ...if the corre sponding timer is set Up Down Air Direction indica tor The indicator shows the direc tion of the outcoming airflow One Hour Only indicator Room Temperature display Shows the room temperature The room temperature display range is 8 39 C The display blinks if the temperature is less than 8 C or 39 C or more Louver display Indicates the action of the swing louver Does not appear if the l...

Page 6: ...he current time display Displays the order of timer operation display Displays whether timer is on or off Buttons used to set the hour and minute of the current time and timer settings h and min buttons Temperature setting display Indicates the desired temperature setting which is set display Displays selected fan speed display The vertical direction of airflow is indicated display Blinks when mod...

Page 7: ... lamp lights up in green while the unit is in operation It blinks while the remote controller is starting up or when there is an error Press to save the setting Main display Press to change the operation mode Main menu Press to move the cursor down Press to return to the previous screen Main display Press to decrease temperature Main menu Press to move the cursor up Press to bring up the Main menu...

Page 8: ...al parts Up Down you can do Manual vane angle Use to set the vane angle for each vane to a fixed position Initial setting Main Sub When connecting two remote controllers one of them needs to be designated as a sub controller Clock Use to set the current time Main display Use to switch between Full and Basic modes for the Main display The initial setting is Full Contrast Use to adjust screen contra...

Page 9: ...42 26 1 280 680 230 32 Cooling 0 08 0 72 PCY P24KA TH kW A kW K min Pa dB A mm mm mm mm kg Service Ref Mode Power supply phase cycle voltage Input Running current External finish Heat exchanger Fan Fan drive No Fan motor output Airflow Low Medium2 Medium1 High External static pressure Operation control Thermostat Noise level Low Medium2 Medium1 High Field drain pipe O D Dimensions Weight W D H IND...

Page 10: ... 300 Static pressure Pa Airflow rate m min 0 1 2 3 4 50 0 50 100 150 200 250 300 Static pressure Pa Airflow rate m min 0 1 2 3 4 PCY P24KA TH PCY P36KA TH PCY P30KA TH PCY P48KA TH PCY P42KA TH How to read curves 4 2 FRESH AIR INTAKE AMOUNT STATIC PRESSURE CHARACTERISTICS Q 0 B A C 1 Curve in the graphs Duct characteristics at site Q A E C 2 Q Qa A D 3 Q Designed amount of fresh air intake m3 min ...

Page 11: ... 0002 µbar PCY P24KA TH NOTCH High Medium1 Medium2 Low SPL dB 42 40 36 34 LINE 1m 1m unit about 1 4m MICROPHONE ceiling 90 80 70 60 50 40 30 20 10 63 125 250 500 1000 2000 4000 8000 APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE NC 60 NC 50 NC 40 NC 30 NC 20 NC 70 BAND CENTER FREQUENCIES Hz OCTAVE BAND SOUND PRESSURE LEVEL dB 0 dB 0 0002 µbar PCY P36KA TH PCY P42KA TH PCY P48KA TH NOTCH Hig...

Page 12: ...t 233 Electrical box When electrical box is pulled down Electrical box 8 7 In case of the rear pipe arrangement make sure to remove the shaded portions from the independent piece Then put the independent piece back in initial position The heat exchanger might be clogged because of dust 5 10 51 246 A A B C D 184 203 6 35 12 7 180 200 9 52 15 88 B 236 150 62 140 18 1237 Suspension bolt pitch 320 680...

Page 13: ...n pump option parts refrigerant pipe will be only upper drain pipe arrangement In case of the rear pipe arrangement make sure to remove the shaded portions from the independent piece Then put the independent piece back in initial position The heat exchanger might be clogged because of dust 5 10 51 246 180 200 Drainage gas ø15 88 liquid ø9 52 236 150 62 140 18 1557 320 680 80 84 88 195 230 233 57 2...

Page 14: ...14 WIRED REMOTE CONTROLLER Unit mm PAR 21MAA PAR 31MAA Option 130 120 83 5 19 5 19 120 120 46 46 83 5 159 3 55 58 19 WIRELESS REMOTE CONTROLLER Option OCH550A ...

Page 15: ...ching terminal numbers S1 S2 S3 3 Since the outdoor side electric wiring may change be sure to check the outdoor unit electric wiring for servicing 4 This diagram shows the wiring of indoor and outdoor connecting wires specification of 220 240V adopting superimposed system of power and signal Self diagnosis 1 For details on how to operate self diagnosis with the wireless remote control refer to th...

Page 16: ...re thermistor TH5 Room temperature thermistor TH1 Refrigerant flow in cooling Strainer 50 Strainer 50 Heat exchanger Refrigerant GAS pipe connection Flare Refrigerant LIQUID pipe connection Flare REFRIGERANT SYSTEM DIAGRAM 8 PCY P18KA TH PCY P24KA TH PCY P30KA TH PCY P36KA TH PCY P42KA TH PCY P48KA TH OCH550A ...

Page 17: ...oubleshooting of problems The trouble is not reoccurring Logged Not logged 1Consider the temporary defects such as the work of protection devices in the refrigerant circuit including compressor poor connection of wiring noise etc Re check the symptom and check the installation environment refrigerant amount weather when the trouble occurred matters related to wiring and such 2Reset check code logs...

Page 18: ... When a malfunction occurs to air conditioner both indoor unit and outdoor unit will stop and operation lamp blinks to inform unusual stop ON OFF TEMP FAN VANE MODE CHECK LOUVER TEST RUN AUTO STOP AUTO START h min RESET SET CLOCK CHECK CHECK display Temperature button CHECK button Refrigerant address display HOUR button ON OFF button Wireless remote controller Option Malfunction diagnosis method a...

Page 19: ...eless remote controller Wired remote controller 1 P1 Intake sensor error P9 Pipe TH5 sensor error 2 P2 Pipe TH2 sensor error 3 E6 E7 Indoor outdoor unit communication error 4 P4 Float switch connector CN4F open 5 P5 PA Drain pump error due to water leakage abnormality Forced compressor stop 6 P6 Freezing protection operation 7 EE Communication error between indoor and outdoor units 8 P8 Pipe tempe...

Page 20: ...ssible due to system start up Correct operation Connector for the outdoor unit s protection device is not connected Reverse or open phase wiring for the outdoor unit s power terminal block L1 L2 L3 Incorrect wiring between indoor and outdoor units incorrect polarity of S1 S2 S3 Remote controller wire short Note Operation is not possible for about 30 seconds after cancellation of function selection...

Page 21: ...board 1 3 Check resistance value of thermistor For characteristics refer to P1 above 2 Check contact failure of connector CN44 on the indoor controller board Refer to 9 7 TEST POINT DIAGRAM Turn the power on and check restart after inserting connector again 4 Check pipe liquid temperature with remote controller in test run mode If pipe liquid temperature is extremely low in cooling mode refrigeran...

Page 22: ...TH TH1 TH Lower temperature between liquid pipe temperature TH2 and condenser evaporator temperature TH5 TH1 Intake temperature 1 4 Check pipe liquid or condenser evapora tor temperature with room temperature display on remote controller and outdoor controller circuit board Pipe liquid or condenser evaporator temperature display is indicated by set ting SW2 of outdoor controller circuit board as f...

Page 23: ... connected with only one indoor unit 3 The address changes to a separate setting 4 6 Diagnose remote controller a When RC OK is displayed remote con trollers have no problem Turn the power off and on again to check When becoming abnormal again replace indoor controller board b When RC NG is displayed replace remote controller c When RC E3 or ERC 00 66 is dis played noise may be causing abnormal it...

Page 24: ...uble 2 Drain defective Drain pump clogging Drain pipe clogging 3 Open circuit of float switch 4 Contact failure of float switch connector 5 Dew condensation on float switch Drain water descends along lead wire Drain water waving due to filter clogging 6 Extension piping connection difference at twin triple quadruple system 7 Miswiring of indoor outdoor connecting at twin triple quadruple system 8 ...

Page 25: ...l block S1 and S2 When AC 220 to 240V is not detected check indoor outdoor unit connecting wire for miswiring When AC 220 to 240V is detected check 4 below 4 Check the fuse on indoor controller board Check the wiring connection If no problem are found indoor controller board is defective 1 Check the voltage of indoor power supply terminal block L N When AC220 to 240V is not detected check the powe...

Page 26: ... 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 0 using SW1 3 6 on outdoor controller circuit board 34 Remove remote controller wires and check LED2 on indoor controller board Wh...

Page 27: ...work properly if you set the switch SWE on the indoor controller board ON the indoor unit will begin emergency operation When emergency operation is activated the indoor unit operates as follows 1 Indoor fan is running at high speed 2 Drain pump is operating Note on the wireless remote control when the remote control does not function it is possible to activate emergency operation by using the ind...

Page 28: ...Other than open UP Normal Open Short Other than short Measure the resistance between the terminals with a tester At the ambient temperature of 20 C 30 C Vane motor MV Abnormal Open or short Red Yellow Red Blue Red Orange Red White Connector Normal 300Ω 2 1 Moving part 4 3 Switch Magnet Moving part Yellow Blue Red Orange White MV 0 10 20 30 40 50 20 10 0 10 20 30 40 50 Thermistor for lower temperat...

Page 29: ...ector VDC DC310 340V TEST POINT 2 VCC between 5 and 4 of the fan connector VCC DC15V Wiring recovery Replace the indoor controller board Replace the fan motor Replace the indoor controller board Replace the fan motor Is the voltage normal Is there contact failure No 1 2 Yes No Check the operation of fan END Yes OK Check the operation END OK Check method of DC fan motor fan motor indoor controller ...

Page 30: ...onnect to the Terminal Block TB2 Between 3 and 5 220 240 V AC CNV Vane motor output MV 12 V pulse output SWE Emergency operation Jumper wire J41 J42 Pair No setting for wireless remote controller FUSE 6 3 A 250 V CNMF Fan motor 1 4 DC 310 340 V 5 4 DC 15 V 6 4 DC 0 6 5 V 7 4 Stop DC0 or 15 V Operation DC7 5 V 0 15 pulse VCC Voltage between pins of C955 15 V DC Same as 5 4 of CNMF CN44 Pipe tempera...

Page 31: ...on the left in the table indicates the jumper line is disco nnected Marks in the table below Jumper wire Short Open Service board MODEL PCY P18KA PCY P24KA PCY P30KA PCY P36KA 1 2 3 4 5 ON OFF 1 2 3 4 5 ON OFF 1 2 3 4 5 ON OFF 1 2 3 4 5 ON OFF The black square indicates a switch position Service board MODEL 1 2 3 4 5 ON OFF PCY P42KA 1 2 3 4 5 ON OFF PCY P48KA 1 2 3 4 5 ON OFF PCY P KA 9 8 FUNCTIO...

Page 32: ...otor white 7P liquid pipe and condenser evaporator temperature ther mistor white 4P vane motor white 20P drain pump blue 3P optional drain float switch white 4P optional Electrical parts in the electrical box Terminal blocks for wired remote controller and indoor and outdoor connection and power supply Indoor controller board Figure 1 Photo 1 Photo 2 slide Air intake grille Air intake grille holdi...

Page 33: ... box cover See Photo 1 4 Pull down the electrical box See Photo 2 5 Disconnect the fan motor connector CNMF white 6 Remove 4 catches that hold the casing and remove the bottom of the casing See Photo 5 7 Loosen 2 hexagon set screws that fix the connecting joint and slide the fan motor to the left hand side See Photo 4 8 Remove 1 earth fixing screw 4 10 ST See Photo 4 9 Remove the motor piece fixin...

Page 34: ...ns together with the shaft by slid ing the connecting joint to the left hand side See Photo 10 10 Remove the sirocco fans from the shaft by loosening the hexagon set screw For more details on how to loosen the screw see Photo 6 and Photo 7 Caution While removing the sirocco fans be sure to hold both the shaft and the sirocco fans by hand to prevent the sirocco fans and shaft from falling For safet...

Page 35: ...cover See Photo 1 5 Pull down the electric box See Photo 2 6 Remove the wireless receiver connector CN90 and the clamp and the cable strap that hold the connector 7 Remove 8 under panel fixing screws 4 10 ST and remove the under panel by sliding approx 10 mm to the front Caution Hold the under panel by hand to avoid it from falling For safety reasons this procedure must be performed by two persons...

Page 36: ...guide vane fix ing screw 4 10 ST Photo 18 Guide vane fixing screw Guide vane Photo 19 Vane supports Auto vane Vane sleeve Gear box side 14 Removing the heat exchanger 1 Remove the air intake grilles See Figure 1 2 2 Remove the side panels right and left See Figure 4 5 3 Remove the under panel See Photo 12 4 Remove the drain pan See Photo 13 14 15 5 Remove the pipe cover See Photo 16 6 Remove the p...

Page 37: ...37 OCH550A ...

Page 38: ...ributed in Mar 2014 No OCH550 REVISED EDITION A Distributed in Oct 2013 No OCH550 Made in Japan HEAD OFFICE TOKYO BLDG 2 7 3 MARUNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN New publication effective Mar 2014 Specifications are subject to change without notice ...

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