Mitsubishi Electric PFFY-P20VKM-E Service Manual Download Page 15

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TROUBLE SHOOTING

9-1. HOW TO CHECK

Parts name

Check points

Disconnect the connector then measure the resistance using a tester.
(Surrounding temperature 10

~30

)

Disconnect the connector then measure the resistance valve using a tester.
(Surrounding temperature 20

)

Linear expansion
valve

(LEV)

(Refer to the next page for a detail.)

Room temperature
thermistor (TH21)

Liquid pipe temperature
thermistor (TH22)

Gas pipe temperature
thermistor (TH23)

Normal

4.3k

~9.6k

Abnormal

Open or short

Abnormal

Open or short

Normal

200k

10%

(1)-(5)

White-Red

(2)-(6)

Yellow-Brown

(3)-(5)

Orange-Red

(4)-(6)

Blue-Brown

Orange

Red

White

Blue

Brown

Yellow

Check 9-2.

Fan motor

(MF1,2)

Measure the resistance between the terminals using a tester.
(Surrounding temperature 20

~30

)

Damper motor (MV2)

Normal

Connector

Abnormal

186~214

Open or short

Brown — Yellow

Brown — Blue

Red — Orange

Red — Pink

(Refer to the next
page for a detail.)

Blue

Yellow Brown

Orange

Red

Pink

6 1

Measure the resistance between the terminals using a tester.
(Surrounding temperature 20

~30

)

Vane motor (MV1)

Normal

Connector

Abnormal

282~306

Open or short

Yellow

Brown

Red

Brown — Red

Brown — Orange

Brown — Yellow

Brown — Blue

Orange Green

PFFY-P20VKM-E

PFFY-P32VKM-E

PFFY-P25VKM-E

PFFY-P40VKM-E

OC404.qxp 06.7.3 9:02 AM Page 15

Summary of Contents for PFFY-P20VKM-E

Page 1: ...CATION 8 4 NOISE CRITERIA CURVES 10 5 AIR OUTLET SELECTION 11 6 OUTLINES AND DIMENSIONS 12 7 WIRING DIAGRAM 13 8 REFRIGERANT SYSTEM DIAGRAM 14 9 TROUBLE SHOOTING 15 10 DISASSEMBLY PROCEDURE 23 11 RoHS PARTS LIST 28 SPLIT TYPE HEAT PUMP AIR CONDITIONERS R407C R22 R410A July 2006 Indication of model name NOTE This service manual describes technical data of the indoor units As for outdoor units refer...

Page 2: ...low residual oil piping If there is a large amount of residual oil hydraulic oil etc inside the piping and joints deterioration of the lubricant will result Use ESTR ETHER or HAB as the lubricant to coat flares and flange connection parts If large amount of mineral oil enter that can cause deterioration of refrigerant oil etc Use liquid refrigerant to seal the system If gas refrigerant is used to ...

Page 3: ...16 Use high tension side pressure of 3 43MPa G or over 2 Charge hose Only for R407C Use pressure performance of 5 10MPa G or over 3 Electronic scale 4 Gas leak detector Use the detector for R134a or R407C 5 Adapter for reverse flow check Attach on vacuum pump 6 Refrigerant charge base 7 Refrigerant cylinder For R407C Top of cylinder Brown Cylinder with syphon 8 Refrigerant recovery equipment ...

Page 4: ...ols with care If dirt dust or moisture enter 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 Electronic refrigerant charging scale Vacuum pump adaptor Size adjustment gauge Gauge manifold Torque ...

Page 5: ...rmed with the cylinder of syphon stood vertically Refrigerant is charged from liquid phase Gravimeter Unit 3 Service tools Use the below service tools as exclusive tools for R410A refrigerant No Specifications 1 Gauge manifold Only for R410A Use the existing fitting specifications UNF1 2 Use high tension side pressure of 5 3MPa G or over 2 Charge hose Only for R410A Use pressure performance of 5 0...

Page 6: ...button Mode button Return button Set Time buttons Back Ahead Timer On Off button Set Day button Opening the door 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 preceding operation number Ventilation button Operation button To next operation number On the controls are set the same operation...

Page 7: ...w and downward during COOL or DRY mode Operation varies according to model The indicator goes off after one hour at which time the airflow di rection also changes Room Temperature display Shows the room temperature Louver display Indicates the action of the swing louver Does not appear if the louver is stationary Power On indicator Indicates that the power is on Fan Speed indicator Shows the selec...

Page 8: ...ger Cross fin Aluminum plate fin and copper tube Type Line flow fan o 2 Airflow rate 2 m3 min 5 9 6 8 7 6 8 7 6 1 7 0 8 0 9 1 6 1 7 0 8 0 9 1 8 0 9 0 9 5 10 7 Fan External static Pa 0 pressure Motor Type DC motor Output kW 0 03o2 Air filter PP honeycomb fabric Catechin air filter Refrigerant Gas Flare mm 12 7 pipe dimension Liquid Flare mm 6 35 Unit drain pipe size mm O D 16 PVC pipe VP 16 connect...

Page 9: ...or Linear expansion valve coil PFFY P25VKM E PFFY P20VKM E PFFY P32VKM E PFFY P40VKM E Fuse Indoor controller board Fan motor Upper Fan motor Lower Power supply terminal block Transmission terminal block OUTPUT 30W ARW40Z8P30MS MP20Z DC12V MP35EA DC12V DC12V Stepping motor drive Port dimension 5 2 0 2000 pulse EFM 40YGME OUTPUT 30W ARW40Y8P30MS Thermistor Room temperature detection Thermistor Pipe...

Page 10: ...2 MICRO BAR BAND CENTER FREQUENCIES Hz Test conditions Cooling Dry bulb temperature 27 Wet bulb temperature 19 APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE COOLING FUNCTION 37 37 SPL dB A LINE High FAN SPEED HEATING Heating Dry bulb temperature 20 Wet bulb temperature 15 90 80 70 60 50 40 30 20 10 63 125 250 500 1000 2000 4000 8000 NC 60 NC 50 NC 40 NC 30 NC 20 NC 70 OCTAVE BAND SOUND PRE...

Page 11: ...urned off Description of operation Operation Upper and lower air flow Room temperature and set temperature are dif ferent w1 Upper air flow Room temperature is close to set temperature or thermo off w1 Upper air flow only Upper and lower air flow Normal condition in heating Upper air flow During defrosting op eration start of opera tion thermo off Upper and lower air flow COOL DRY HEAT FAN Air flo...

Page 12: ...3 7 131 131 4 6 Hole Indoor unit Installation plate 96 123 125 60 19 12 60 128 118 165 205 200 12 12 11 Gas pipe 12 7 flared 1 2 Liquid pipe 6 35 flared 1 4 drain Air in Air out Air out 46 5 46 5 600 700 54 508 137 607 More than 100mm More than 100mm More than 100mm PFFY P20VKM E PFFY P25VKM E PFFY P32VKM E PFFY P40VKM E ...

Page 13: ...PER MOTOR DAMPER LIMIT SWITCH CLOSE LINEAR EXPANSION VALVE POWER SUPPLY TRANSMISSION ROOM TEMP DETECTION 0 15k 25 5 4k PIPE TEMP DETECTION LIQUID 0 15k 25 5 4k LEGEND NAME SYMBOL NAME MF1 MF2 MV1 MV2 LS LEV TB2 TB5 TH21 TH22 INDOOR CONTROLLER BOARD CN32 CN51 CN52 SW2 SW3 SW4 ZNR FUSE LED1 LED2 SYMBOL A B SWITCH MODE SELECTION ADDRESS SETTING 1ST DIGIT ADDRESS SETTING 2ND DIGIT CONNECTION NO AIR OU...

Page 14: ...m temperature detection TH21 Thermistor Pipe temperature detection Gas TH23 Thermistor Pipe temperature detection Liquid TH22 Linear expansion valve Gas pipe Liquid pipe Flare connection Gas pipe Liquid pipe PFFY P20 P25 P32 P40 VKM E 12 7 1 2 6 35 1 4 Item Capacity Unit mm PFFY P20VKM E PFFY P25VKM E PFFY P32VKM E PFFY P40VKM E ...

Page 15: ... i10 1 5 White Red 2 6 Yellow Brown 3 5 Orange Red 4 6 Blue Brown Orange Red White Blue Brown Yellow 3 6 1 5 4 2 M Check 9 2 Fan motor MF1 2 Measure the resistance between the terminals using a tester Surrounding temperature 20 30 Damper motor MV2 Normal Connector Abnormal 186 214 Open or short Brown Yellow Brown Blue Red Orange Red Pink Refer to the next page for a detail Blue Yellow Brown Orange...

Page 16: ...e temperature thermistor TH22 Gas pipe temperature thermistor TH23 Thermistor R0 15k 3 Fixed number of B 3480 2 Rt 15exp 3480 0 15k 10 9 6k 20 6 3k 25 5 2k 30 4 3k 40 3 0k Thermistor for lower temperature Linear expansion valve 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 V...

Page 17: ... way It is not necessary to exchange the linear expansion valve if the leakage is small and not making any trouble Liquid pipe thermistor 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 connector Exchange the line...

Page 18: ...F12 CNMF22 280VDC CNMF24 2 15VDC CNMF26 2 1 6 5VDC The voltage between CNMF25 1 and 6 2 are values during the fan motor operation In the case that the fan motor off the voltage is 0V Fan motor position sensor signal check Turn around the fan motor more than one revolution slowly and check the voltage between the connecter FAN MOTOR upper CNMF27 1 FAN MOTOR lower CNMF28 2 Check method of indoor fan...

Page 19: ...angle setting w5 Heat 4degrees up Superheat setting temperature w6 Sub cool setting temperature Heat pump Effective Not available Not available First setting Down B C Not effective Effective 6 2 degrees 10degrees 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 At delivery ON OFF 1 2 3 4 5 6 7 8 9 10 Ind...

Page 20: ...oller is being used Refer to 5 AIR OUTLET SELECTION This is the switch to be used when the indoor unit is operated with R2 series outdoor unit as a set If the unit is used at the 230V or 240V area set the voltage to 240V If the unit is used at the 220V set the voltage to 220V Remarks At delivery Address board Address can be set while the unit is stopped Address board At delivery Address board At d...

Page 21: ... to the terminal block TB5 M NET transmission connecting wire 24 30V DC non polar LED2 Power supply for MA Remote controller CN3A MA Remote controller connecting wire 1 3 8 7 13V DC Pin 1 CN6V2 Damper motor CN6V1 Vane motor CN32 Connector Remote switch SW2 Capacity setting SW3 Function setting SW4 Model setting CN52 Remote indication CN151 Centrally control CN36 Damper limit switch CN44 Pipe tempe...

Page 22: ...9 4 2 Address board PFFY P20VKM E PFFY P25VKM E PFFY P32VKM E PFFY P40VKM E SW1 Function setting SW5 Voltage selector SW12 2nd digit address setting SW11 1st digit address setting SWC Air outlet selection ...

Page 23: ... the front grille from the panel See Photo 1 2 Remove the screws of the panel See Photo 2 3 Open the horizontal vane and push the left right and middle of the upper part of the panel and pull the panel toward you See Photo 2 4 Lift up the panel and remove it from the box Screws of the panel Push Horizontal vane Push Push Grille PFFY P20VKM E PFFY P25VKM E PFFY P32VKM E PFFY P40VKM E Push Push ...

Page 24: ... controller board case from the electrical box OPERATING PROCEDURE PHOTOS Terminal block TB2 Screw of the ground wire I B Photo 4 3 Removing the electrical box 1 Remove the panel Refer to 1 2 Remove the electrical cover Refer to 2 3 Remove the ground wires from the electrical box Refer to 2 4 Remove the ground wires connected to the indoor fan motor and ones connected to the indoor heat exchanger ...

Page 25: ...ving the indoor fan motor upper 1 Remove the panel Refer to 1 2 Remove the electrical box Refer to 3 3 Remove the nozzle upper See Photo 6 4 Unhook the water cover from the catches and remove the water cover See Photo 6 5 Removing the screw of the motor band and then the motor band See Photo 7 6 Remove the line flow fan and the indoor fan motor upper from the box Photo 7 Screw of vane motor Water ...

Page 26: ...assembly lower See Photo 9 5 Remove the screws of the damper motor support and then the damper motor support 6 Remove the screws of the damper motor and then the damper motor from the damper motor support 7 Disconnect the connector from the damper motor 8 Remove the damper limit switch LS 7 Removing the indoor fan motor 1 Remove the panel Refer to 1 2 Remove the nozzle assembly lower and the drain...

Page 27: ...he connector CN44 on the indoor controller board 5 Loosen the room temperature thermistor wire clamp under the electrical box 6 Disconnect the connector CN20 on the indoor controller board 9 Removing the heat exchanger and linear expansion valve 1 Remove the panel Refer to 1 2 Remove the hair pin cover and water cover See Photo 3 3 Remove the 2 screws of the heat exchanger See Photo 14 4 Unhook th...

Page 28: ...8 11 RoHS PARTS LIST 11 1 INDOOR UNIT ELECTRICAL PARTS AND FUNCTIONAL PARTS PFFY P20VKM E PFFY P25VKM E PFFY P32VKM E PFFY P40VKM E 1 2 3 4 5 6 7 12 18 13 16 23 21 22 8 9 11 10 15 15 24 19 4 14 20 17 16 ...

Page 29: ... MF2 MF1 TB5 TH21 TB2 I B A B MV1 FUSE No RoHS Part No Part name Remarks Symbol in Wiring Diagram Q ty unit 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 G G G G G G G G G G G G G G G G G G G G G G G G G T7W E00 530 T7W E07 002 T7W E06 002 T7W E01 103 T7W E00 103 T7W E01 530 T7W E08 223 T7W E09 130 T7W E00 170 T7W E00 272 T7W E03 527 T7W E08 002 T7W E04 114 T7W E26 762 T7W E00 ...

Page 30: ...iagram Q ty unit 1 2 3 4 5 G G G G G PFFY P20 25 32 40VKM E BOX PANEL ASSEMBLY FRONT PANEL CATECHIN AIR FILTER BACK PLATE 1 1 1 1 1 T7W E01 635 T7W E06 651 T7W E05 691 T7W E01 500 T7W E01 808 11 2 STRUCTURAL PARTS 1 2 3 5 4 PFFY P20VKM E PFFY P25VKM E PFFY P32VKM E PFFY P40VKM E ...

Page 31: ...COVER INDOOR HEAT EXCHANGER WATER COVER PIPE TEMPERATURE THERMISTOR EXPANSION VALVE TH22 TH23 LEV No Part No Part name Remarks Symbol in Wiring Diagram Q ty unit 1 2 3 4 5 RoHS G G G G G T7W E00 031 T7W H56 480 T7W E01 031 T7W E16 202 T7W E19 401 1 1 1 1 1 PFFY P20 25 32 40VKM E 11 3 INDOOR UNIT HEAT EXCHANGER ...

Page 32: ...RUNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN C Copyright 2006 MITSUBISHI ELECTRIC ENGINEERING CO LTD Distributed in Jul 2006 No OC404 PDF 8 Made in Japan New publication effective Jul 2006 Specifications subject to change without notice ...

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