Mitsubishi Electric City Multi Series PCFY-P15NKMU-E Technical & Service Manual Download Page 1

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TECHNICAL & SERVICE MANUAL

CONTENTS

1. TECHNICAL CHANGES ......................... 2

2. PART NAMES AND FUNCTIONS .......... 2

3. SPECIFICATION ..................................... 4

4. OUTLINES AND DIMENSIONS .............. 8

5. WIRING DIAGRAM ............................... 11

6. REFRIGERANT SYSTEM DIAGRAM ........13

7. MICROPROCESSOR CONTROL...............14

8. TROUBLESHOOTING .......................... 21

9. DISASSEMBLY PROCEDURE ............. 30

Indoor unit
[Model names]

[Service Ref.]

No. OCH500

REVISED EDITION-A

INDOOR UNIT

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 (OCB500)

Model name
indication

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

PCFY-P15NKMU-E

PCFY-P24NKMU-E

PCFY-P30NKMU-E

PCFY-P36NKMU-E

PCFY-P15NKMU-E.TH
PCFY-P15NKMU-ER1.TH
PCFY-P24NKMU-E.TH
PCFY-P24NKMU-ER1.TH
PCFY-P30NKMU-E.TH
PCFY-P30NKMU-ER1.TH
PCFY-P36NKMU-E.TH
PCFY-P36NKMU-ER1.TH

Revision:

• PCFY-P15/24/30/36NKMU-

ER1 have been added in
REVISED EDITION-A.

• Some descriptions have

been modified.

• Please void OCH500.

Summary of Contents for City Multi Series PCFY-P15NKMU-E

Page 1: ... 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 OCB500 Model name indication SPLIT TYPE HEAT PUMP AIR CONDITIONERS PCFY P15NKMU E PCFY P24NKMU E PCFY P30NKMU E PCFY P36NKMU E PCFY P15NKMU E TH PCFY P15NKMU ER1 TH PCFY P24NKMU E TH PCFY P24NKMU ER1 TH PCFY P30NKMU E TH PCFY P30NKMU ER1 TH PCFY P36NKMU E...

Page 2: ... I B has been changed S W version up Use the specified refrigerant only Never use any refrigerant other than that specified Doing so may cause a burst an 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...

Page 3: ...ec 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 is on Fan Speed indicator ...

Page 4: ...eight kg lb 24 53 32 71 36 79 38 84 Heat exchanger Cross fin Aluminum fin and copper tube FAN Type x quantity Sirocco fan 2 Sirocco fan 3 Sirocco fan 4 External Pa 0 static press mmH2O 0 Motor type DC motor Motor output kW 0 090 0 095 0 160 Driving mechanism Direct driven by motor Airflow rate m3 min 10 11 12 13 14 15 16 18 20 22 25 28 21 24 27 31 Low Mid2 Mid1 High L s 167 183 200 217 233 250 267...

Page 5: ...troller board Drain pump Option Fan motor Power supply terminal block Transmission terminal block MA remote controller terminal block 8 pole OUTPUT 90W 8 pole OUTPUT 95W 8 pole OUTPUT 160W MSBPC20 DC12V 300Ω phase INPUT 10 8W 24 Hr Open Short detection DC 5V DC12V Stepping motor drive Port dimension ø5 2 0 2000pulse EFM 80YGME DC12V Stepping motor drive Port dimension ø3 2 0 2000pulse EFM 40YGME N...

Page 6: ... 70 0 63 125 250 500 1k 2k 4k 8k NC 60 NC 50 Approximate minimum audible limit on continuous noise NC 40 NC 20 NC 30 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 Approximate minimum audible limit on continuous noise NC 40 NC 20 NC 30 Octave band pressure level dB 0dB 20μPa Octave band pressure level dB 0dB...

Page 7: ...air intake duct system for airflow amount Q Pa in W G x10 2 E Static pressure of indoor unit with airflow amount Q Pa in W G x10 2 Qa Estimated amount of fresh air intake without D CMM CFM How to read curves PCFY P15NKMU E TH PCFY P15NKMU ER1 TH PCFY P24NKMU E TH PCFY P24NKMU ER1 TH PCFY P30 36NKMU E TH PCFY P30 36NKMU ER1 TH 50 20 0 50 20 100 40 150 60 200 80 250 100 300 120 Static pressure Pa in...

Page 8: ...ss remote controller and i see sensor Optional Parts Emergency operation switch Cooling Emergency operation switch Heating DEFROST STAND BY lamp Receiver Operation lamp When electrical box is pulled down Electrical box 9 3 16 233 2 Electrical box Drainage pipe connection 1 26mm I D Drainage pipe connection for the left arrangement Knockout hole for left drain piping arrangement Refrigerant pipe co...

Page 9: ... because of dust 8 Ceiling Electrical box 3 5 FRONT VIEW 11 16 18 4 3 4 121 Φ 4 1 5 1 6 Φ 1 2 5 7 1 2 190 3 76 4 7 8 124 18 1 8 461 1 13 16 46 6 9 3 16 233 2 NOTES 1 Use M10 or W3 8 screw for anchor bolt 2 Please be sure when installing the drain pump option parts refrigerant pipe will be only upward DEFROST STAND BY lamp Emergency operation switch Cooling Receiver Operation lamp Emergency operati...

Page 10: ...down 2 15 16 75 2 1 1 2 38 7 4 3 3 8 85 3 3 8 86 15 1 4 387 2 Electrical box Air intake 59 3 4 1518 26 3 4 680 18 3 4 476 57 182 85 7 3 16 3 3 8 2 1 4 In case of wireless remote controller and i see sensor Optional Parts Emergency operation switch Heating Operation lamp Receiver Emergency operation switch Cooling DEFROST STAND BY lamp 9 5 16 236 liquid Φ3 8 Φ9 52 gas Φ5 8 Φ15 88 Drainage 7 7 8 200...

Page 11: ...e TH21 ROOM TEMP DETECTION 32ºF 15ΚΩ 77ºF 5 4ΚΩ Detect THERMISTOR ADDRESS SETTING 1s DIGIT ADDRESS SETTING 10ths DIGIT BRANCH No 1 Use copper supply wires 2 1 9 Be sure to turn off the source power and then disconnect fan motor connector Failure to do so will cause trouble in fan motor A B ADDRESS CN43 RED ADDRESS CN81 RED LED2 ADDRESS CN42 RED ADDRESS CN82 RED VANE CNV WHT SWA SWC SW1 MV SW12 SW1...

Page 12: ...D ADDRESS CN82 RED VANE CNV WHT SWA SWC SW1 MV SW12 SW11 CN32 WHT SW3 SW4 SWE SW2 SW14 ON OFF ON OFF ON OFF ON OFF 9 6 8 5 4 3 2 1 12345678910 12345678910 123456 12345 Refer to table 1 M NET CN2M BLU INTAKE CN20 RED CN25 WHT FLOAT SW CN4F WHT WIRELESS CN90 WHT LEV CN60 WHT WHT YLW ORN BLU RED BRN MA REMOCON CN3A BLU LIQUID GAS CN44 WHT CN41 WHT CN51 WHT CN52 GRN TH21 TH23 TH22 CN27 RED LED1 TB5 SH...

Page 13: ...ipe Liquid pipe Flare connection Gas pipe Liquid pipe PCFY P15NKMU E TH PCFY P15NKMU ER1 TH ø12 7 1 2 ø6 35 1 4 PCFY P24NKMU E TH PCFY P30NKMU E TH PCFY P36NKMU E TH PCFY P24NKMU ER1 TH PCFY P30NKMU ER1 TH PCFY P36NKMU ER1 TH ø15 88 5 8 ø9 52 3 8 Item Service Ref Unit mm inch Liquid pipe thermistor TH22 PCFY P15NKMU E TH PCFY P24NKMU E TH PCFY P30NKMU E TH PCFY P36NKMU E TH PCFY P15NKMU ER1 TH PCF...

Page 14: ...ture 2 F Thermo ON Room temperature desired temperature Thermo OFF 1 2 Anti freezing control Detected condition When the 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 condit...

Page 15: ...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 Low or Auto of the fan speed notch the vane changes to horizontal pos...

Page 16: ...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 Same control as COOL operation Same control as COOL operation PAR 21MAA ON OFF FILTER CHECK OPERATION CLEAR TEST TEMP MENU BACK DAY MONI...

Page 17: ...e 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 control performed during the COOL operation but with no restriction on the vane s downward blow setting Same contr...

Page 18: ... STAND BY will be displayed during the hot adjust mode To be continued on 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 Hot adjust mode 2 2 Residual heat exclusion mode 2 3 Thermo OFF mode When the compressor off by the t...

Page 19: ...y the unit Thermo OFF Hot adjust Extra low mode Heat defrost mode 3 Drain pump 4 Vane control Up down vane change From the preceding page 3 1 Drain pump control The drain pump turns ON for the specified amount of time when any of the following conditions is met ON for 3 minutes after the operation mode is switched from COOL or DRY to another operation mode FAN ON for 6 minutes after the float swit...

Page 20: ...switch is submerged in the water when the float swich 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 15 seconds In the air Detected that the float switch is OFF for 15 seconds Same control as COOL operation PAR 21M...

Page 21: ... sensor 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 F 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...

Page 22: ...30 F 15 8kΩ 50 F 9 6kΩ 70 F 6 0kΩ 80 F 4 8kΩ 90 F 3 9kΩ 100 F 3 2kΩ Thermistor for lower temperature 8 1 2 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 Valve position can be changed in proportion to the number of pulse signals Connection between the i...

Page 23: ... color 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 ...

Page 24: ... 5 and 4 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 Replace the fuse Yes Check the operation END OK Check the operation ...

Page 25: ...l angle Superheat setting temperature 5 Sub cool setting temperature 5 Heat pump Not available Not available Not available First setting 4 Setting A B C D 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 Indoor co...

Page 26: ... setting Address board Address can be set while the unit is stopped Address board Initial setting Address board 3 2 1 SW12 10 SW11 1 SW12 SW11 SW14 SW14 Initial setting Effective timing Before power supply ON Under operation or suspension Silent 8 2ft 2 5m 8 5ft 2 6m Standard 8 9ft 2 7m 9 8ft 3 0m High ceiling 11 5ft 3 5m 13 8ft 4 2m P15 P24 P30 P36 SWA In this model it is not necessary to change ...

Page 27: ...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 steadily lit for 3 seconds then disappears J41 J42 Wireless remote controller Pair No SWE Test run for Drain pump Option Connector Jumper Drain pump and fan are activated simultaneously after the connector SWE is set to ON and turn on the power The connec...

Page 28: ...ion setting SW2 Capacity setting CN6Y i see sensor motor output 12VDC pulse output CN44 Pipe temperature thermistor Liquid TH22 Gas TH23 CN4F Drain float switch FS CN20 Room temperature thermistor TH21 CN27 Damper signal output 12VDC CN90 Connect to the wireless remote controller board W B LED1 Main power supply Indoor unit 208 230V CNMF Connect to the fan motor MF DC294 325V DC15V DC0 6V DC0 or D...

Page 29: ...P30NKMU E TH PCFY P36NKMU E TH PCFY P15NKMU ER1 TH PCFY P24NKMU ER1 TH PCFY P30NKMU ER1 TH PCFY P36NKMU ER1 TH SW1 Function setting SW12 Address setting 10ths DIGIT SW11 Address setting 1st DIGIT SW14 Branch No SWA Ceiling height selector SWC Option selector OCH500A ...

Page 30: ...x using 2 hooks in the back of electrical box 5 Disconnect the connectors on the indoor controller board Removing the electrical box 6 Disconnect the wires from the terminal blocks and pull out the electrical box See Photo 2 Removing the indoor controller board 6 Remove the 6 supports from the indoor controller board and remove the indoor controller board See Photo 3 Figure 1 Photo 1 Photo 2 slide...

Page 31: ...am and remove the beam See Photo 1 3 Remove 2 screws from the electrical cover and remove the electrical cover 4 Remove 2 screws from the electrical box and pull the electrical box downward 5 Temporarily secure the electrical box using 2 hooks in the back of electrical box 6 Remove the lower casing while pressing the 4 catches of the casing right side of the fan motor See Photo 6 7 Loosen the 2 se...

Page 32: ...ical cover 4 Remove 2 screws from the electrical box and pull the electrical box downward Temporarily secure the electrical box using 2 hooks in the back of electrical box 5 Remove 2 screws from the left side beam and remove the beam See Photo 9 6 Loosen 2 set screws 2 hexagon set screws of connect ing joint See Photo 5 7 Remove 3 lower casings while pressing each 4 catches of the casing See Photo...

Page 33: ... the right side panel See Figure 3 3 Remove the connector of vane motor 4 Remove 2 screws of vane motor cover then remove vane motor Photo 12 Screws Connector Vane motor and cover Photo 13 Under panel fixing screws 9 Removing the drain pan 1 Remove the air intake grille See Figure 1 2 2 Remove the side panel right and left See Figure 3 3 Remove the under panel See Photo 13 Remove the screws of the...

Page 34: ...de vane then remove the guide vane 10 Removing the pipe thermistors Liquid TH22 and Gas TH23 1 Remove the air intake grille See Figure 1 2 2 Remove the left and right side panels See Figure 3 3 Remove the under panel See Photo 13 4 Remove the drain pan See Photo 14 15 16 5 Disconnect the connector CN44 white from the indoor controller board 6 Remove 6 screws from the pipe cover and remove the pipe...

Page 35: ...Remove the left and right side panels See Figure 3 7 Remove the under panel See Photo 13 8 Remove the drain pan See Photo 14 15 16 9 Remove the pipe cover See Photo 17 10 Remove the pipe thermistors TH22 and TH23 from each holder See Photo 18 11 Remove the pipe band fixing screw and remove the pipe band See Photo 21 12 Remove 3 screws from the heat exchanger and remove the heat exchanger with LEV ...

Page 36: ...tributed in Apr 2012 No OCH500 REVISED EDITION A Distributed in Aug 2011 No OCH500 Made in Japan New publication effective Apr 2012 Specifications are subject to change without notice HEAD OFFICE TOKYO BLDG 2 7 3 MARUNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN ...

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