Mitsubishi Electric City Multi PKFY-P24NKMU-E2 Technical & Service Manual Download Page 19

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7-3. TEST POINT DIAGRAM

7-3-1. Indoor controller board
PKFY-P24NKMU-E2.TH
PKFY-P30NKMU-E2.TH

CN3A
Connected to the
termial block (TB15)
(MA-Remote controller
connecting wire)

8.7-13V DC

(Pin

(+))

CN44
Pipe temperature thermistor

: Liquid (TH22)

: Gas1 (TH23)

SW4
Model selection

CND
Power supply for
indoor controller board

: 208/230VAC

SW2
Capacity setting

LED1
Main power supply
(Indoor unit :
208/230VAC)

CN20
Room temperature
thermistor (TH21)

LED2
Power supply for
MA-Remote controller

CN32
Remote switch

Jumper wire J41, J42
Pair No. setting for wireless
remote controller

LDSWE(A)
Connect to the
wireless remote
controller board
(S.B)

CN2M
Connect to the terminal block (TB5)
(M-NET transmission connecting wire)
24-30VDC (non-polar)
Power supply from outdoor unit

SW3
Function setting

CN2G
Pipe temperature
thermistor Gas2 (TH24)

CN24
External heater

12VDC (

: +)

CN60
Linear expansion
valve (LEV) output
12VDC pulse output

CNRU
Connect to the
wireless remote
controller board
(W.B)

CN151
Vane motor output
12VDC pulse

FUSE
3.15A 250V

CNMF
Connect to the fan motor (MF)

: DC294~325V

: DC15V

: DC0~6V

: DC0 or DC15V (Stop)

DC7.5V (Operation)
(12VDC pulse)

LD SWE (B)
Connect to
the indoor
controller
board (I.B)

CN51
Centrally control

: Control signal

12VDC pulse input (

: +)

: Operation indicator

12VDC (

: +)

: Malfunction indicator

12VDC (

: +)

CN52
Remote indicator

: Status lamp 12VDC (

: +)

Fan motor output (SW1-5 OFF)

Thermostat ON (SW1-5 ON)

: Cooling/Dry status lamp

12VDC (

: +)

: Heating status lamp

12VDC (

: +)

OCH518

Summary of Contents for City Multi PKFY-P24NKMU-E2

Page 1: ...L 9 7 TROUBLESHOOTING 14 8 DISASSEMBLY PROCEDURE 21 Indoor unit Model names Service Ref No OCH518 INDOOR UNIT SPLIT TYPE HEAT PUMP AIR CONDITIONERS R22 R410A Note This manual describes only service data of the indoor units RoHS compliant products have G mark on the spec name plate April 2012 PARTS CATALOG OCB518 PKFY P24NKMU E2 PKFY P24NKMU E2 TH PKFY P30NKMU E2 PKFY P30NKMU E2 TH ...

Page 2: ...AN SPEED display indicates which fan speed has been selected display The vertical direction of air flow is indicated display Blinks when model is selected display display CHECK and TEST RUN display indicate that the unit is being checked or test run display OPERATION MODE display Operation mode display indicates which operation mode is in effect TIMER CONTROL buttons AUTO STOP OFF timer when this ...

Page 3: ...he 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 46 102 F The display blinks if the temperature is less than 46 F or 102 F or more Louver display Indicates the action of the swing louver Does not appear if the louver is not running Power On indicator Indicates that the power ...

Page 4: ... Book PAC YU25HT 1 phase 208 230V 60Hz Cross fin Aluminum fin and copper tube DC motor Direct drive Polyethylene sheet PP honeycomb Fuse LEV R410A R22 CITY MULTI PKFY P24NKMU E2 Plastic MUNSELL 1 0Y 9 2 0 2 7 0 24 000 0 07 0 50 7 9 27 000 0 07 0 50 365 1170 295 14 3 8 46 1 16 11 5 8 21 46 Line flow fan 1 0 0 0 056 20 26 333 433 710 920 43 49 I D 16mm 5 8 ø9 52 ø3 8 ø9 52 ø3 8 ø15 88 ø5 8 ø15 88 ø5...

Page 5: ...PKFY P24NKMU E2 External static pressure 0Pa Power source 208 230V 60Hz Measured in anechoic room OCTAVE BAND PRESSURE LEVEL dB 0dB 20MPa PKFY P24NKMU E2 TH PKFY P30NKMU E2 TH 39 49 43 49 Sound level dB A Sound level at anechoic room Low High Service Ref Approximate minimum audible limit on continuous noise High speed Low speed 3 3 ft 1m Measurement location 3 3 ft 1m OCTAVE BAND CENTER FREQUENCIE...

Page 6: ...142 4 29 32 125 4 19 32 117 3 15 16 100 2 15 16 75 1 31 32 50 15 1 8 384 0 13 3 4 349 2 16 15 16 430 5 1 2 12 5 11 1 2 292 10 13 32 264 9 1 32 229 5 8 17 32 217 6 9 16 167 5 3 32 129 5 4 1 8 104 5 3 7 16 87 5 2 15 32 62 5 1 15 32 37 5 1 2 12 5 2 1 8 54 31 32 25 0 12 1 4 311 8 17 32 216 5 13 11 32 339 20 7 8 530 5 7 7 16 189 13 11 32 339 17 11 16 449 2 23 1 32 585 23 1 32 585 A 5 16 7 8 3 1 32 77 2...

Page 7: ...7 WIRING DIAGRAM 4 PKFY P24NKMU E2 TH PKFY P30NKMU E2 TH OCH518 ...

Page 8: ...rature thermistor TH21 Gas pipe thermistor 1 TH23 Liquid pipe thermistor TH22 Linear expansion valve Gas pipe Liquid pipe Flare connection Gas pipe Liquid pipe PKFY P24NKMU E2 PKFY P30NKMU E2 15 88 5 8 9 52 3 8 Item Model Unit mm inch Gas pipe thermistor 2 TH24 15 88 5 8 9 52 3 8 PKFY P24NKMU E2 TH PKFY P30NKMU E2 TH OCH518 ...

Page 9: ...mp TH22 is 32 F or less in 16 minutes from compressors start up anti freezing control starts and the thermo OFF Released condition The timer which prevents reactivating is set for 3 minutes and anti freezing control is cancelled when any one of the following conditions is satisfied Liquid pipe temp TH22 turns 50 F or above The condition of the thermo OFF has become complete by thermostat etc The o...

Page 10: ... Over 64 F ON OFF T1 83 F 83 F T1 79 F 79 F T1 75 F 75 F T1 Unconditional 9 3 7 3 5 3 3 3 10 3 Dry thermo OFF 2 Fan Note Remote controller setting is not acceptable Dry thermo Fan speed notch Excluding the following Room temp 64 F ON OFF Low Low Stop 3 Vane up down vane change Same control as COOL operation PAR 21MAA ON OFF FILTER CHECK OPERATION CLEAR TEST TEMP MENU BACK DAY MONITOR SET CLOCK ON ...

Page 11: ...ction on the vane s downward blow setting Same control as COOL operation PAR 21MAA ON OFF FILTER CHECK OPERATION CLEAR TEST TEMP MENU BACK DAY MONITOR SET CLOCK ON OFF û Fû C û Fû C ERROR CODE AFTER TIMER TIME SUN MON TUE WED THU FRI SAT ON OFF Hr AFTER FILTER FUNCTION ONLY1Hr WEEKLY SIMPLE AUTO OFF 6 3 FAN OPERATION How to operate Press POWER ON OFF button Press the operation MODE button to displ...

Page 12: ...the auxiliary heater ON to OFF thermostat or operation stop etc the indoor fan operates in Low mode for 1 minute This control is same for the model without auxiliary heater 1 STAND BY will be displayed during the hot adjust mode To be continued on the next page By the remote controller setting switch of 2 speeds Type Fan speed notch Low High 2 speeds PAR 21MAA ON OFF FILTER CHECK OPERATION CLEAR T...

Page 13: ...ails HEAT mode for room temperature Desired temperature COOL mode for room temperature Desired temperature 1 HEAT mode ĺ COOL mode Room temperature Desired temperature 3 F or 3 min has passed 2 COOL mode ĺ HEAT mode Room temperature Desired temperature 3 F or 3 min has passed 1 Initial value of operation mode Remarks 2 Mode change Same control as cool operation 3 COOL mode Same control as heat ope...

Page 14: ... LEV White Yellow Orange Blue Red Brown CN60 Refer to 7 1 3 7 1 2 Liner expansion valve 7 1 1 Thermistor 4 ĭ4 3 6 5 ĭ3 2 ĭ2 1 ĭ1 ĭ4 ĭ3 ĭ2 ĭ1 Controller board Drive circuit Connector CN60 DC12V Brown Red Blue Orange Yellow White M 4 6 2 3 5 1 Blue Brown Yellow Orange Red White Linear expansion valve Thermistor characteristic graph Room temperature thermistor TH21 Liquid pipe temperature thermistor ...

Page 15: ...or of lead wire and missing terminal of the con nector Exchange the linear expan sion valve Exchange the linear expan sion valve If large amount of refriger ant is leaked exchange the linear expansion valve Disconnect the connector at the controller board then check the continuity Measure the resistance between each coil white red yellow brown orange red blue brown using a tester It is normal if t...

Page 16: ...d 3 of the fan connector VDC DC294 325V TEST POINT VCC between 4 and 3 of the fan connector VCC DC15V Wiring recovery Replace indoor controller board Replace indoor controller board Replace the fan motor Replace the fan motor Indoor controller board fuse check Replace indoor controller board Replace the fan motor Is the voltage normal Is there contact failure No Yes No No Is the fuse normal Replac...

Page 17: ...subcool 2 ON OFF 1 2 3 4 5 6 7 8 ON OFF 1 2 3 4 5 6 7 8 9 10 Address board Initial setting Initial setting SW3 Function selection SW2 Capacity code Before power supply ON switch SW1 Mode Effective timing Under suspension selection Switch Pole Function Operation by switch Remarks Built in remote controller Indoor unit Changing the opening of linear expansion valve during thermo OFF 1 SW1 7 OFF ON O...

Page 18: ...ress the SET button using a pointed implement Check that the remote controller s display has stopped before continuing MODEL SELECT flashes and the model No 3 digits appears steadily lit 2 Press the MINUTE button twice The pair number appears flashing 3 Press the temperature buttons to select the pair number to set 4 Press the SET button using a pointed implement The set pair number is displayed s...

Page 19: ... to the terminal block TB5 M NET transmission connecting wire 24 30VDC non polar Power supply from outdoor unit SW3 Function setting CN2G Pipe temperature thermistor Gas2 TH24 CN24 External heater 12VDC 1 CN60 Linear expansion valve LEV output 12VDC pulse output CNRU Connect to the wireless remote controller board W B CN151 Vane motor output 12VDC pulse FUSE 3 15A 250V CNMF Connect to the fan moto...

Page 20: ...0 7 3 3 Address board PKFY P24NKMU E2 TH PKFY P30NKMU E2 TH SW1 Function setting SW12 Address setting 10ths DIGIT SW11 Address setting 1s DIGIT 7 3 2 Wireless remote controller board PKFY P24NKMU E2 TH PKFY P30NKMU E2 TH SW14 Branch No CN301 Connect to the indoor controller board I B OCH518 ...

Page 21: ...e screw and hook of address board case See Photo 2 3 Disconnect the connectors of address board 4 Remove the front and side electrical box covers each 1 screw 5 Disconnect the connectors on the indoor controller board See Photo 3 6 Remove the switch board holder and open the cover 7 Pull out the indoor controller board toward you then remove the indoor controller board and switch board See Photo 3...

Page 22: ...EMBLY with VANE and VANE MOTOR AND DRAIN HOSE 1 Remove the panel and corner box Refer to procedure 1 2 Remove the electrical box covers Refer to procedure 2 3 Disconnect the vane motor connector CN151 on the indoor controller board 4 Pull out the drain hose from the nozzle assembly and remove nozzle assembly See Photo 5 Photo 4 Connect for ground Photo 5 Photo 6 Fixture Electrical box 5 REMOVING T...

Page 23: ... 3 screws fixing the left side of the heat exchanger See Photo 9 10 Lift the heat exchanger and pull out the line flow fan to the lower left Photo 7 7 REMOVING THE LIQUID PIPE THERMISTOR AND GAS PIPE THERMISTOR 1 Remove the panel and the corner box Refer to procedure 1 2 Remove the electrical box covers Refer to procedure 2 3 Remove the water cut See Photo 2 4 Remove the liquid pipe thermistor and...

Page 24: ...ure 4 3 Remove the water cut 4 Remove the pipe thermistors Refer to procedure 7 5 Disconnect the connector CN60 on the indoor controller board and the connector for ground wire 6 Remove 3 screws fixing the left side of the heat exchanger See Photo 9 7 Remove the heat exchanger with LEV 9 REMOVING THE ROOM TEMPERATURE THERMISTOR 1 Remove the panel and corner box Refer to procedure 1 2 Remove the el...

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