Mitsubishi Electric City Multi PLFY-P08NCMU-E Technical & Service Manual Download

Page: 22 / 32

TROUBLESHOOTING

10-1. HOW TO CHECK THE PARTS
PLFY-P08NCMU-E.TH PLFY-P12NCMU-E.TH PLFY-P15NCMU-E.TH
PLFY-P08NCMU-E

.TH PLFY-P12NCMU-E

.TH PLFY-P15NCMU-E

.TH

PLFY-P08NCMU-ER2.TH PLFY-P12NCMU-ER2.TH PLFY-P15NCMU-ER2.TH

Parts name

Check points

Disconnect the connector then measure the resistance with a tester.
(At the ambient temperature 50

F~86

Disconnect the connector then measure the resistance valve with a tester.

Measure the resistance between the terminals with a tester.
(At the ambient temperature 68

F~86

Measure the resistance between the terminals with a tester.
(At the ambient temperature 68

F~86

Measure the resistance after 3 minutes have passed since the power supply was intercepted.
(At the ambient temperature 32

F~140

Vane motor (MV)

Linear expansion
valve (LEV)

Drain pump (DP)

Drain sensor (DS)

Refer to the next page for the details.

Thermistor (TH21)

(Room temperature

detection)

Thermistor (TH22)

(Pipe temperature

detection/ Liquid)

Thermistor (TH23)

(Pipe temperature

detection/ Gas)

Yellow

Relay

connector

Yellow

1
2
3

Normal

4.3k

~9.6k

Abnormal

Open or short

Abnormal

Open or short

Normal

0.6k

~6.0k

Abnormal

Open or short

Normal

200

10%

White-Red

Yellow-Brown Orange-Red

Blue-Brown

Normal

Connector

Abnormal

300

Open or short

Normal

Abnormal

290

Open or short

Orange

Red

White

Blue

Brown

Yellow

Orange

Red

White

Red — Yellow
Red — Blue
Red — Orange
Red — White

Blue

Yellow

Fan motor (MF)

Refer to the next
page for the details.

BLK

RED ORN

YLW

BLU

BRN

WHT

Measure the resistance between the terminals with a tester.
(Coil wiring temperature 50

F~86

Normal

WHT-BLK

BLK-BLU

BLU-YLW

YLW-RED
RED-BRN

303

~328

105

~114

~42

235

~254

272

~295

~85

~40

191

~206

PLFY-P08NCMU-E

(1)

PLFY-P08NCMU-ER2

387

~418

~83

~21

179

~193

Abnormal

Opened or

short-circuited

: Thermal fuse 284°F±36

PLFY-P12NCMU-E

(1)

PLFY-P12NCMU-ER2

PLFY-P15NCMU-E

(1)

PLFY-P15NCMU-ER2

Summary of Contents for City Multi PLFY-P08NCMU-E

Page 1: ...29 R410A R22 No OCH410 REVISED EDITION B June 2009 NOTE This manual describes only service data of the indoor units Indoor unit model names Service Ref PLFY P08NCMU E PLFY P08NCMU E TH PLFY P08NCMU E1 TH PLFY P08NCMU ER2 TH PLFY P12NCMU E PLFY P12NCMU E TH PLFY P12NCMU E1 TH PLFY P12NCMU ER2 TH PLFY P15NCMU E PLFY P15NCMU E TH PLFY P15NCMU E1 TH PLFY P15NCMU ER2 TH PARTS CATALOG OCB410 Revision PL...

Page 2: ...tions of CONTROLLER BOARD C B have been changed Initial setting of auto restart function Not effective effective SW1 9 OFF ON External heating control change PLFY P08NCMU E TH PLFY P08NCMU E1 TH PLFY P12NCMU E TH PLFY P12NCMU E1 TH PLFY P15NCMU E TH PLFY P15NCMU E1 TH PANEL has been changed SLP 15AAU White 0 70Y 8 59 0 97 SLP 15AAUW Pure white 6 4Y 8 9 0 4 ...

Page 3: ...Greatly reduces the frequency the filter needs to be replaced making maintenance all the easier 4 FRESH AIR INTAKE Provides indoor air of the highest quality 5 SMUDGE FREE AIRFLOW Reduces annoying drafts and smudging 6 SLIM UNIT BODY FOR EASY INSTALLATION The 22 7 16 inch slim body and octagonal shape which make the distance between bolts only 16 17 32 inch help installa tion easy and maintenance ...

Page 4: ... SET CLOCK ON OFF Temperature setting buttons Down Up Timer Menu button Monitor Set button Mode button Return button Set Time buttons Back Ahead Timer On Off button Set Day button Opening the lid ON OFF button Fan Speed button Filter button Enter button Test Run button Check button Clear button Airflow Up Down button Louver button Operation button To return operation number Ventilation button Oper...

Page 5: ...s off Temperature Setting Shows the target temperature Day of Week Shows the current day of the week Time Timer Display Shows the current time unless the simple or Auto Off timer is set If the simple or Auto Off timer is set the time to be switched off is shown Sensor indication Displayed when the remote controller sensor is used Locked indicator Indicates that remote controller but tons have been...

Page 6: ...mensions Height Width Depth Electric characteristic Input Cooling Heating Cooling Heating Current PLFY P08NCMU E TH PLFY P08NCMU E1 TH PLFY P08NCMU ER2 TH 8 000 9 000 0 05 0 05 0 23 0 23 280 320 350 250 290 320 0 015 29 32 38 34 7 15 000 17 000 0 06 0 06 0 28 0 28 31 35 40 12 000 13 500 0 06 0 06 0 28 0 28 30 34 39 Single phase 208 230V 60Hz V Hz Air flow 3 DRY WET Unit Galvanized sheets with gray...

Page 7: ...L dB 0 dB 0 0002 μbar BAND CENTER FREQUENCIES Hz High Medium 40 SPL dB 35 LINE NOTCH Low 31 PLFY P15NCMU E TH PLFY P15NCMU E1 TH PLFY P15NCMU ER2 TH 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 OCTAVE BAND SOUND PRESSURE LEVEL dB 0 dB 0 0002 μbar BAND CENTER FREQUENCIES Hz PLFY P08NCMU E TH P...

Page 8: ...on Liquid Thermistor Pipe temperature detection Gas Fuse Indoor controller board Fan motor with Thermal fuse Electric heater Condensation proof Power supply terminal block Transmission terminal block MA remote controller terminal block 6 pole OUTPUT 15W PK6N15 LA 6 pole OUTPUT 20W PK6N21 LA 6 pole OUTPUT 20W PK6N20 LA Fan motor capacitor Vane motor Drain pump Drain sensor Linear expansion valve co...

Page 9: ...FY P12NCMU ER2 TH PLFY P15NCMU ER2 TH Taking air into the unit 5 2 FRESH AIR INTAKE AMOUNT STATIC PRESSURE CHARACTERISTICS Q 0 B A C 1 Curve in the left graphs Duct characteristics at site Q A E C 2 Q Qa A D 3 NOTE Fresh air intake amount should be 20 or less of whole air amount to prevent dew dripping CN51 Multiple remote controller adapter PAC SA88HA E Indoor controller board Distance between in...

Page 10: ...izontal vane Connector Unlocking button Vane motor 3 Set a vertical vane of the air outlet which is to be fixed by the hand slowly within the range in the table below Measured standard posi tion of the grille Horizontal vane Specified range Up down airflow direction Horizontal 30 Downward 45 Downward 55 Downward 70 A 21 mm 13 16 inch 25 mm 31 32 inch 28 mm 1 3 32 inch 30 mm 1 3 16 inch The vanes c...

Page 11: ...ir intake hole Air outlet hole Air outlet hole 11 27 32 301 11 27 32 301 14 27 32 377 14 27 32 377 25 19 32 650 Suspension bolt M10 or W3 8 Suspension bolt lower edge 9 1 16 230 7 5 32 182 1 7 8 48 Wiring entry Terminal block Ceiling surface 9 1 4 235 8 3 16 208 7 19 32 193 25 32 20 3 21 32 93 1 1 2 2 9 32 38 58 2 19 32 66 4 3 4 121 21 32 17 7 15 16 202 2 7 32 56 2 1 14 57 3 7 16 87 1 7 32 31 Ceil...

Page 12: ...ATURE DETECTION TH22 TH21 LEV LINEAR EXPANSION VALVE MV MF VANE MOTOR FAN MOTOR WITH THERMAL FUSE CAPACITOR FAN MOTOR C1 PIPE TEMPERATURE DETECTION LIQUID MA REMOTE CONTROLLER LED2 LED1 3 1 1 3 CND POWER YLW 2 1 YLW 1 3 BLU D U M CNC D HEATER RED ORN FUSE ZNR CNP X1 RED ORN GRILLE BLU 5 WHT BLU RED ORN YLW RED RED 1 10 7 2 3 6 4 5 8 9 3 5 5 5 5 C1 1 5 BLK YLW WHT BRN 7 9 X6 X5 X4 X7 X4 X7 X5 X6 MF...

Page 13: ...ervicing for outdoor unit always follow the wiring diagram of outdoor unit 2 In case of using MA Remote controller please connect to TB15 Remote controller wire is non polar 3 In case of using M NET please connect to TB5 Transmisson wire is non polar 4 Symbol S of TB5 is the shield wire connection 5 Symbols used in wiring diagram above are terminal block connecter 6 The setting of the SW2 dip swit...

Page 14: ...mistor TH23 Liquid pipe thermistor TH22 Linear expansion valve Gas pipe Liquid pipe Flare connection Gas pipe Liquid pipe 1 2 1 4 Refrigerant flow in cooling Refrigerant flow in heating Unit inch PLFY P08NCMU E TH PLFY P12NCMU E TH PLFY P15NCMU E TH PLFY P08NCMU E1 TH PLFY P12NCMU E1 TH PLFY P15NCMU E1 TH PLFY P08NCMU ER2 TH PLFY P12NCMU ER2 TH PLFY P15NCMU ER2 TH ...

Page 15: ...he 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 completed by thermoregulating etc The operation modes became mode other than COOL The operation stopped By the remote controller setting ...

Page 16: ...ater Drain sensor temperature rise t Temperature of drain sensor before current is applied T0 Temperature of drain sensor after current is applied T1 t T1 T0 1 Initial setting Start at COOL mode and horizontal vane 2 Vane position Horizontal Downward A Downward B Downward C Swing 3 Restriction of the downward vane setting When setting the downward vane A B or C in Med or Low of the fan speed notch...

Page 17: ... 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 ON OFF Low Stop 4 Vane up down vane change Same control as COOL operation 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 F C ERROR CODE AFT...

Page 18: ...2 2 Liquid level detection method The liquid level is detected by determining whether or not the drain sensor is submerged based on the amount the temperature rises after self heating the sensor This process is performed if any of the following conditions is met Drain pump is ON Indoor piping liquid piping temperature indoor intake temperature 18 F Indoor piping liquid piping temperature or indoor...

Page 19: ... hot adjust mode A C B Extra Low Low Set fan speed by the remote controller Hot adjust mode 1 2 2 Residual heat exclusion mode When the condition changes the auxiliary heater ON to OFF thermoregulating 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 Continued t...

Page 20: ...3 minutes 1 Initial setting OFF HEAT last setting When changing the mode from exception of HEAT to HEAT operation Downward C 2 Vane position Horizontal Downward A Downward B Downward C Swing 3 Restriction of vane position The vane is horizontally fixed for the following modes The setting by the remote controller is temporarily invalidated and vane control is set by the unit controller Thermo OFF H...

Page 21: ...s kept ON for a further 6 minutes 1 2 Liquid level detection method The liquid level is detected by determining whether or not the drain sensor is submerged based on the amount the temperature rises after self heating the sensor This process is performed if any of the following conditions is met Drain pump is ON Indoor piping liquid piping temperature indoor intake temperature 14 F except during d...

Page 22: ... details Refer to the next page for the details Thermistor TH21 Room temperature detection Thermistor TH22 Pipe temperature detection Liquid Thermistor TH23 Pipe temperature detection Gas 1 3 Yellow Relay connector Yellow 1 2 3 Normal 4 3k 9 6k Abnormal Open or short Abnormal Open or short Normal 0 6k 6 0k Abnormal Open or short Normal 200 10 White Red Yellow Brown Orange Red Blue Brown Normal Con...

Page 23: ...F 6 3k 50_F 3 9k 70_F 2 5k 80_F 2 0k 90_F 1 6k 100_F 1 3k Thermistor for lower temperature Linear expansion valve 1 Operation summary of the linear expansion valve Linear expansion valve open close through stepping motor after receiving the pulse signal from the indoor controller board Valve position can be changed in proportion to the number of pulse signal Connection between the indoor controlle...

Page 24: ...sed all the way It is not necessary to exchange the linear expansion valve if the leakage is small and not making any trouble Thermistor Liquid pipe Linear expansion valve Motor will idle and make ticking noise when motor is operated while the linear expansion valve is locked This ticking sound is the sign of the abnormality Check the color of lead wire and missing terminal of the con nector Excha...

Page 25: ...Superheat setting temperature 4 Sub cool setting temperature 4 Heat pump Not available Not available Not available First setting Down B C Not effective Effective 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10 SW2 Capacity code setting 1 6 1 5 SW3 Function setting Thermistor Room temperature detection position Initial setting ON OFF 1 2 3 4 5 6 7 8 9 10 Indoor controller board Note 3 At cooling mode eac...

Page 26: ... indoor unit s refrigerant pipe with the BC controller s end connection number Remain other than series R2 at 0 Remarks Initial setting SW12 10 SW11 1 SW12 SW11 SW14 SW14 Initial setting Effective timing Before power supply ON Indoor controller board Indoor controller board 10 3 TEST POINT DIAGRAM 10 3 1 Indoor power board PLFY P08NCMU E TH PLFY P12NCMU E TH PLFY P15NCMU E TH PLFY P08NCMU E1 TH PL...

Page 27: ...to 3 8 7 13V DC Pin1 CN29 Pipe temperature detection Gas TH23 CN21 Pipe temperature detection Liquid TH22 LED2 Power supply for MA Remote controller SW4 Model selection CN60 Linear expansion valve output LEV CN31 Drain sensor DS SW3 Function setting CN51 Centrally control SW2 Capacity setting CN52 Remote indication CN6V Vane motor output MV CN20 Room temperature detection TH21 CN32 Connector Remot...

Page 28: ... Remote controller connecting wire Between 1 to 3 8 7 13V DC Pin1 CN29 Pipe temperature detection Gas TH23 CN21 Pipe temperature detection Liquid TH22 LED2 Power supply for MA Remote controller SW4 Model selection CN60 Linear expansion valve output LEV CN31 Drain sensor DS SW3 Function setting CN51 Centrally control SW2 Capacity setting CN52 Remote indication CN6V Vane motor output MV CN20 Room te...

Page 29: ...fan guard Air intake grille knob 3 Removing the panel 1 Remove the air intake grille Refer to 1 Corner panel See Figure 2 1 Remove the screw of the corner 2 Slide the corner panel to the direction of the arrow 3 and remove the corner panel Panel See Photo 2 1 Disconnect the connector that connects with the unit 2 Remove the 2 screws from the panel and loose other 2 screws which are fixed to the ov...

Page 30: ...door controller board 6 Remove the 3 screws fixed to the piping cover and remove the piping cover See photo 9 7 Remove the 6 screws fixed to the flat plate and remove the flat plate 8 Disconnect the lead wires to the direction of the fan motor and remove 3 nuts of the fan motor Photo 5 6 Removing the drain pan 1 Remove the panel Refer to 3 2 Remove the room temperature detection and the 2 lead wir...

Page 31: ... the heat exchanger and remove the heat exchanger 9 Removing the drain pump DP and drain sensor DS 1 Remove the panel Refer to 3 2 Remove the drain pan Refer to 6 3 Remove the 2 screws fixed to the control box cover and remove the control box cover 4 Remove the connectors of the CNP and the CN31 from the indoor controller board 5 Remove the 1 screw fixed to the cover and remove the cover See photo...

Page 32: ...REVISED EDITION B PDF 6 Distributed in Jul 2007 No OCH410 REVISED EDITION A PDF 8 Distributed in Nov 2006 No OCH410 PDF 8 Made in Japan New publication effective Jun 2009 Specifications subject to change without notice HEAD OFFICE TOKYO BLDG 2 7 3 MARUNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN ...

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