manualshive.com logo in svg

Mitsubishi Electric Citi Multi Series, Technical & Service Manual

Share
Download
Mitsubishi Electric Citi Multi Series Technical & Service Manual Download Page 23

23

9

TROUBLESHOOTING

9-1. HOW TO CHECk THE PARTS

Parts name

Check points

Disconnect the connector then measure the resistance with a tester.

(At the ambient temperature 50 to 86

_

F)

Refer to “9-1-1. Thermistor”.

Room temperature

thermistor       (TH21)

Liquid pipe thermistor

                       (TH22)

Gas pipe thermistor

                       (TH23)

Normal

4.3 to 9.6 k

"

Abnormal

Open or short

Measure the resistance between the terminals with a tester.

(Winding temperature 68°F)

Measure the resistance between the terminals using a tester.

Drain pump (DP) (Option)

i-see sensor

(Option)

Drain float switch (FS)

(Option)

1
3

YLW

YLW

Normal

Abnormal

290 

"

Open or short

State of moving part

Abnormal

DOWN

Other than open

UP

Normal

Open

Short

Other than short

Measure the resistance between the terminals with a tester.

(At the ambient temperature of 68 to 86°F)

Vane motor (MV)

i-see sensor motor (MT)

(Option)

Abnormal

Open or short

Red - Yellow
Red - Blue
Red - Orange
Red - White

Connector

Normal

300 

"

Measure the resistance between the terminals with a tester.

(At the ambient temperature of 68 to 86°F)

Abnormal

Open or short

Red - Yellow

Red - Blue

Red - Orange

Red - White

Connector

Normal

250 

"

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

Linear expansion

valve (LEV)

Abnormal

Open or short

Normal

200

"

 

i

10%

White-Red

Yellow-Brown

Orange-Red

Blue-Brown

Orange

Red

White

Blue

Brown

Yellow

M

Refer to “9-1-2. Linear 

expansion valve”.

MV

MV

Normal

Abnormal

1.857–3.132 V DC

Other than the normal

0.939–1.506 V DC

2

(

−

)–

4

(+)

i-see sensor connector

i-see sensor (At the ambient temperature of 50 to 104°F)

NOTE

 : Be careful when handling static electricity.

1

(+)–

2

(

−

)

Other than the normal

Do not disassemble corner panel with

 i-see sensor.

Black plastic tape

Turn on the indoor unit with black plastic tape on the outside of the i-see sensor controller board.

With electricity being turned on, measure the power voltage between connectors with a tester.

The i-see sensor rotates, and pull out the connector of motor for the i-see sensor.

2

1

Moving part

4

3

Switch
Magnet

Moving

Part

4 3 2 1

4 3

1

BlueBlackPink Brown

2

Yellow

Blue

Red

Orange

White

Yellow

Blue

Red

Orange

White

PLFY-P08NBMU-E2 PLFY-P12NBMU-E2  PLFY-P15NBMU-E2  PLFY-P18NBMU-E2

PLFY-P24NBMU-E2 PLFY-P30NBMU-E2  PLFY-P36NBMU-E2 

OCH579

Summary of Contents for Citi Multi Series

Page 1: ...IMENSIONS 13 6 WIRING DIAGRAM 14 7 REFRIGERANT SYSTEM DIAGRAM 15 8 MICROPROCESSOR CONTROL 16 9 TROUBLESHOOTING 23 10 DISASSEMBLY PROCEDURE 32 PLFY P08NBMU E2 PLFY P12NBMU E2 PLFY P15NBMU E2 PLFY P18NBMU E2 PLFY P24NBMU E2 PLFY P30NBMU E2 PLFY P36NBMU E2 Notes This manual describes service data of the indoor units only RoHS compliant products have G mark on the spec name plate INDOOR UNIT Model nam...

Page 2: ...explosion or fire when the unit is being used serviced or disposed of Correct refrigerant is specified in the manuals and on the spec labels provided with our products We will not be held responsible for mechanical failure system malfunction unit breakdown or accidents caused by failure to follow the instructions OCH579 ...

Page 3: ...e Airflow High Low Automatic air speed adjustment Medium 2 Medium 1 1 Wide Airflow The new wide shape vane capable of wide angle air supply provides comfort even at the corners of a room regardless of cooling and heating operation A reduction in the air speed by 20 compared to the conventional product eliminates uncomfortable draft sensation for friendly air conditioning 2 WAVE Airflow SYSTEM HEAT...

Page 4: ...use the centralized controller The lamp will light up in green when turned on and blink during startup and when an error occurs Pressing this button starts and stops the operation TEMP button MODE button Wired remote controller Note The phrase Wired remote controller in this manual refers only to the PAC YT53CRAU If you need any information for the other remote controller please refer to either th...

Page 5: ...ation Manual Fan speed icon Vane icon icon appears when the power is on Indoor temperature Operation modes CENTRAL icon 1 CHECK icon 2 Preset temperature 3 1 icon Appears when one of the following local operations is prohibited ON OFF operation mode preset temperature fan speed vane CENTRAL 3 Preset temperature Centigrade or Fahrenheit is selectable Refer to the Installation Manual for details In ...

Page 6: ... 14 0 15 0 15 5 16 0 233 250 258 267 494 530 565 636 14 0 15 0 16 0 18 0 233 250 267 300 m min L s Noise level Low Mid2 Mid1 High measure on anechoic room dB A 27 29 30 31 208 230 V 27 29 30 31 208 230 V 28 29 30 31 208 230 V 28 30 31 32 208 230 V dB A dB A Insulation material PS Air filter PP honeycomb long life filter anti bacterial type Protection device Fuse Refrigerant control device LEV Conn...

Page 7: ...m min L s Noise level Low Mid2 Mid1 High measure on anechoic room dB A 28 31 34 37 208 230 V 28 32 35 37 208 230 V 35 38 41 43 208 230 V dB A dB A Insulation material PS Air filter PP honeycomb long life filter anti bacterial type Protection device Fuse Refrigerant control device LEV Connectable outdoor unit R410 CITY MULTI Diameter of refrigerant pipe O D Liquid in mm 3 8 9 52 Flare 3 8 9 52 Flar...

Page 8: ...Octave band pressure level dB 0dB 20Pa Octave band center frequencies Hz 10 0 15 0 20 0 25 0 30 0 35 0 40 0 45 0 50 0 55 0 60 0 65 0 70 0 63 125 250 500 1k 2k 4k 8k NC 60 NC 50 NC 40 NC 20 NC 30 Octave band pressure level dB 0dB 20Pa Octave band center frequencies Hz 10 0 15 0 20 0 25 0 30 0 35 0 40 0 45 0 50 0 55 0 60 0 65 0 70 0 63 125 250 500 1k 2k 4k 8k NC 60 NC 50 NC 40 NC 20 NC 30 Octave ban...

Page 9: ...ermistor Gas pipe thermistor Vane motor Drain pump Drain float switch Linear expansion valve PLFY P08NBMU E2 PLFY P12NBMU E2 PLFY P18NBMU E2 PLFY P15NBMU E2 PLFY P24NBMU E2 PLFY P30NBMU E2 PLFY P36NBMU E2 Room temperature thermistor Fuse Indoor controller board Fan motor Power supply terminal block Transmission terminal block MA remote controller terminal block 8 pole OUTPUT 50W 8 pole OUTPUT 120W...

Page 10: ... 2 7 m 9 8 ft 3 0 m 2 Standard 8 9 ft 2 7 m 9 8 ft 3 0 m 10 8 ft 3 3 m 3 High ceiling 11 5 ft 3 5 m 11 5 ft 3 5 m 11 5 ft 3 5 m 4 direction 3 direction 2 direction SWA SWB PLFY P08 12 15 18 24 30NBMU E2 PLFY P36NBMU E2 4 3 2 1 Silent 2 Standard 10 5ft 3 2m 11 8ft 3 6m 13 1ft 4 0m 3 High ceiling 14 8ft 4 5m 14 8ft 4 5m 14 8ft 4 5m 4 direction 3 direction 2 direction SWA SWB 4 3 2 8 9 ft 2 7 m 9 8 f...

Page 11: ...h duct hole A A A 14 1 8 2 8 burring hole Indoor unit 5 29 32 150 cut out hole Fresh air intake hole 6 7 8 175 burring hole pitch Drain pipe Fresh air intake hole diagram Unit in mm Refrigerant pipe 3 1 8 2 8 burring hole Branch duct hole diagram view from either side 4 29 32 125 burring hole pitch 3 15 16 100 cut out hole Ceiling 6 7 32 158 120 120 13 25 32 350 3 17 32 90 3 15 16 100 3 15 16 90 3...

Page 12: ...P24 30 36NBMU E2 Multifunction casement Standard filter Multifunction casement High efficiency filter Taking air into the unit Taking air into the unit 4 4 FRESH AIR INTAKE AMOUNT STATIC PRESSURE CHARACTERISTICS 1 PLFY P08 12 18NBMU E2 Multifunction casement High efficiency filter Multifunction casement Standard filter Q 0 B A C 1 Curve in the graphs Duct characteristics at site Q A E C 2 Q Qa A D...

Page 13: ...or MA Remote controller terminal block Emergency operation switch Cooling and Emergency Up Down switch Up Emergency operation switch Heating and Emergency Up Down switch Down Ceiling Cut out hole Burring hole pitch 3 ø1 8 3 ø2 8 Burring hole Detail drawing of fresh air intake hole Burring hole 14 ø1 8 14 ø2 8 Cut out hole Burring hole pitch Cut out hole Detail connecting of branch duct Both aspect...

Page 14: ...1 1 9 A B RED ADDRESS CN43 ADDRESS CN81 RED LED2 ADDRESS CN42 RED RED ADDRESS CN82 VANE CNV WHT SWB SWA SW1 MV MV MV MV CN32 WHT SW3 SW4 SWE SW2 ON OFF ON OFF ON OFF ON OFF 9 6 5 4 8 5 5 5 5 4 3 2 1 12345678910 12345678910 123456 12345 GRILLE 2 3 4 M NET CN2M BLU CND BLK CNAC WHT D U M CNP BLU FAN CNMF WHT INTAKE CN20 RED CN25 WHT FLOAT SW CN4F WHT WIRELESS CN90 WHT LEV CN60 WHT WHT YLW ORN BLU RE...

Page 15: ...23 Liquid pipe thermistor TH22 Linear expansion valve Gas pipe Liquid pipe Flare connection Gas pipe Liquid pipe PLFY P08 12 15NBMU E2 1 2 12 7 1 4 6 35 PLFY P18NBMU E2 1 2 12 7 5 8 15 88 1 4 6 35 3 8 9 52 PLFY P24 30NBMU E2 5 8 15 88 3 8 9 52 PLFY P36NBMU E2 5 8 15 88 3 4 19 05 3 8 9 52 Item Model Unit in mm PLFY P08NBMU E2 PLFY P12NBMU E2 PLFY P15NBMU E2 PLFY P18NBMU E2 PLFY P24NBMU E2 PLFY P30N...

Page 16: ...liquid pipe temp 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 1 Liquid pipe temp TH22 turns 50 F or above 2 The condition of the thermo OFF has become complete by th...

Page 17: ...t switch is ON for 15 seconds In the air Detected that the float switch is OFF for 15 seconds 1 Initial setting Start at COOL mode and horizontal vane 2 Vane position Horizontal Downward A Downward B Downward C Downward D Swing Auto 3 Restriction of the downward vane setting When setting the downward vane A B C or D in Med1 Med2 or Low of the fan speed notch the vane changes to horizontal position...

Page 18: ...e starting operation Thermostat signal Room temperature T1 Dry thermo ON time min Dry thermo OFF time min Less than 64 F 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 4 Vane up down vane change Sa...

Page 19: ...6 minutes after the float switch is submerged in the water when the float switch control judges the sensor is in the water 2 2 Float switch control Float switch control judges whether the sensor is in the air or in the water by turning the float switch ON OFF In the water Detected that the float switch is ON for 15 seconds In the air Detected that the float switch is OFF for 15 seconds Same as the...

Page 20: ...inating the hot adjust mode A C B Extra Low Low Set fan speed by the remote controller Hot adjust mode 1 1 STAND BY will be displayed during the hot adjust mode Continue to the next page By the remote controller setting switch of 4 speeds Auto When Auto is set fan speed is changed depending on the value of Desired temperature Room temperature Give priority to under mentioned controlled mode 2 1 Ho...

Page 21: ...ne change 3 1 Drain pump control The drain pump turns ON for the specified amount of time when any of the following conditions is met 1 ON for 3 minutes after the operation mode is switched from COOL or DRY to another operation mode FAN 2 ON for 6 minutes after the float switch is submerged in the water when the float switch control judges the sensor is in the water 3 2 Float switch control Float ...

Page 22: ...he operation mode is switched from COOL or DRY to another operation mode FAN 2 ON for 6 minutes after the float switch is submerged in the water when the float switch control judges the sensor is in the water 1 2 Float switch control Float switch control judges whether the sensor is in the air or in the water by turning the float switch ON OFF In the water Detected that the float switch is ON for ...

Page 23: ...e of 68 to 86 F Abnormal Open or short Red Yellow Red Blue Red Orange Red White Connector Normal 250 Disconnect the connector then measure the resistance valve with a tester Linear expansion valve LEV Abnormal Open or short Normal 200 i10 White Red Yellow Brown Orange Red Blue Brown Orange Red White Blue Brown Yellow M Refer to 9 1 2 Linear expansion valve MV MV Normal Abnormal 1 857 3 132 V DC Ot...

Page 24: ...istor for lower temperature 9 1 2 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 signals Connection between the indoor controller board and the linear expansion valve 1 273 t 32 1 8 1 ...

Page 25: ...ight while the signals are output or keeps lighting even after the signals stop Countermeasures Exchange the indoor con troller board at drive circuit failure Linear expansion valve mechanism is locked Valve does not close completely Wrong connection of the connector or contact failure To check the linear expansion valve operate the indoor unit in fan mode and at the same time operate other indoor...

Page 26: ... board Wiring recovery Trouble of the indoor controller board Replace the indoor controller board Trouble of the fan motor Replace the fan motor Does the voltage repeat 0 and 15 V DC Replace the indoor controller board Is the voltage normal Is there contact failure Yes 1 2 No Yes No Yes Power supply check Remove the connector CNMF Measure the voltage in the indoor controller circuit board TEST POI...

Page 27: ...ifier Vane Vane swing function in heating wave flow Vane horizontal angle 1 Vane horizontal angle 2 Sensible temperature correction Superheat setting temperature 5 Sub cool setting temperature 5 Heat pump Not available Not available Not available First setting 4 Depends on SW3 5 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...

Page 28: ... Initial setting Address board Address board Initial setting Address board 3 2 1 2 3 4 SW12 10 SW11 1 SW12 SW11 SW14 SW14 Initial setting Effective timing Before power supply ON Under operation or suspension 1 Silent 8 2 ft 2 5 m 8 9 ft 2 7 m 9 8 ft 3 0 m 2 Standard 8 9 ft 2 7m 9 8 ft 3 0 m 10 8 ft 3 3 m 3 High ceiling 11 5 ft 3 5 m 11 5 ft 3 5 m 11 5 ft 3 5 m 4 direction 3 direction 2 direction S...

Page 29: ...ndoor units or more are near Pair No setting is necessary 1 Pair No setting is available with the 4 patterns Setting patters A to D 2 Make setting for J41 J42 of indoor controller board and the Pair No of wireless remote controller You may not set it when operating it by one remote controller 1 Setting for indoor unit Jumper wire J41 J42 on the indoor controller board are cut according to the tabl...

Page 30: ...otor MF 1 4 310 340 V DC 5 4 15 V DC 6 4 0 6 V DC 7 4 0 or 15 V DC Stop 7 5 V DC Operation 12 V DC pulse CNP Drain pump output DP 1 3 208 230 V AC CN2M Connect to the terminal block TB5 M NET transmission connecting wire 24 30 V DC non polar CN3A Connect to the terminal block TB15 MA Remote controller connecting wire 1 3 8 7 13 V DC Pin1 LED2 Power supply for MA Remote controller CN32 Remote switc...

Page 31: ...ng height selector SWB Discharge outlet number selector SW12 Address setting 10s digit SW11 Address setting 1s digit SWC Option selector PLFY P08NBMU E2 PLFY P12NBMU E2 PLFY P15NBMU E2 PLFY P18NBMU E2 PLFY P24NBMU E2 PLFY P30NBMU E2 PLFY P36NBMU E2 OCH579 ...

Page 32: ...grille and the filter See Figure 1 2 Remove the 2 screws from the electrical box cover 3 Disconnect the connectors CNMF White 7P for fan motor CN44 White 4P for thermistor TH22 TH23 CNP Blue 3P for drain pump CN4F White 4P for float switch CND Black 5P for earth and TB2 CNV White 20P for vane motor CN81 CN42 Red 8P 4P for address board CN2M Blue 2P for TB5 CN3A Blue 3P for TB15 4 Remove the 6 supp...

Page 33: ...ector of the fan motor CNMF 8 Remove the 3 nuts and washers and rubber mounts of the fan motor 8 Removing the drain pan 1 Remove the air intake grille and the filter See Figure 1 2 Remove the 2 screws from the electrical box cover 3 Disconnect the connectors Refer to procedure 4 4 Remove the panel See Photo 4 5 5 Remove the electrical wiring service panel 3 screws 6 Remove the electrical box See P...

Page 34: ...sembly fixing screw Drain pump fixing screw Float switch fixing screw 9 Removing the liquid pipe temperature thermistor TH22 and gas pipe temperature thermistor TH23 1 Remove the drain pan See Photo 6 2 Remove the turbo fan Refer to procedure 6 3 Remove the 2 wiring clamps See Photo 3 4 Remove the coil plate 2 screws 5 Remove the thermistors which are inserted into the holders installed to the thi...

Page 35: ... the 3 screws of the piping cover and pull out piping cover 3 Remove the 2 screws of coil plate 4 Remove the 2 screws of the coil 5 Remove the screw of the coil support 6 Pull out the heat exchanger Photo 10 Linear expansion valve Heat exchanger fixing screw Coil support Heat exchanger Piping cover OCH579 ...

Page 36: ...LECTRIC CORPORATION Distributed in Mar 2015 No OCH579 Made in Japan New publication effective Mar 2015 Specifications are subject to change without notice HEAD OFFICE TOKYO BLDG 2 7 3 MARUNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN TM ...

Reviews:

No comments

Brands by name

Popular brands

Load more brands