Mitsubishi Electric CITY MULTI PKFY-P24NKMU-E, CITY MULTI PKFY-P30NKMU-E, CITY MULTI, PKFY-P24NKMU-E2, PKFY-P30NKMU-E2 Service Manual

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

TECHNICAL & SERVICE MANUAL

R22R410A

May 2011

No. OCH462

REVISED EDITION-A

Indoor unit
[Model names] [Service Ref.]

PKFY-P24NKMU-E

PKFY-P30NKMU-E

PKFY-P24NKMU-E.TH
PKFY-P30NKMU-E.TH

INDOOR UNIT

Revision:

• 3. OUTLINES AND
DIMENSIONS has been modi­fied in REVISED EDITION-A.

• Some descriptions have been
modified.

• Please void OCH462.

Note:

• This manual describes only
service data of the indoor
units.

• RoHS compliant products
have <G> mark on the spec
name plate.

CONTENTS

1. PART NAMES AND FUNCTIONS

2. SPECIFICATION

3. OUTLINES AND DIMENSIONS

4. WIRING DIAGRAM

5. REFRIGERANT SYSTEM DIAGRAM

6. MICROPROCESSOR CONTROL

7. TROUBLESHOOTING

8. DISASSEMBLY PROCEDURE

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2
4
6
7
8

9
14
21

PARTS CATALOG (OCB462)

Use the specifi ed refrigerant only.

Never use any refrigerant other than that specifi ed.

Doing so may cause a burst, an explosion, or fi re when the unit is being used, serviced, or disposed of.
Correct refrigerant is specifi ed 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.

1

PART NAMES AND FUNCTIONS

Indoor unit

Filter

Air inlet

Air outlet

Wireless remote controller

display

OPERATION MODE display
Operation mode display indicates which
operation mode is in effect.

The vertical direction of air flow is indicated.

FAN SPEED display indicates which fan
speed has been selected.

The unit is turned ON and OFF alternately
each time the button is pressed.

Used to change the fan speed.

Used to switch the operation mode between
cooling, drying, fan, heating and auto mode.

+ In case the outdoor unit is cool only type,

Only press this button to perform an
inspection check or test operation.
Do not use it for normal operation.

Used to change the air flow

display

display

ON/OFF button

FAN SPEED SELECT button

MODE SELECT button

the heating and auto mode are not
available.

CHECK-TEST RUN button

VANE CONTROL button

Vane

Louver

CHECK

TEST RUN

CHECK and TEST RUN display indicate that
the unit is being checked or test-run.

Blinks when model is selected.

display

MODEL SELECT

display

CHECK
MODEL SELECT

NOT AVAILABLE

ON/OFF TEMP

VAN E

MODE

LOUVER

CHECK

TEST RUN

RESETSET CLOCK

TEST RUN

FAN

°F
°C

AMPM

AMPM

AUTO STOP

AUTO START

h

min

2

Front grille

Emergency
switch

Lights up while the signal is transmitted to
the indoor unit when the button is pressed.

SET TEMP. display indicates the s et desired
temperature.

Displays the current time.

Displays when in timer operation or when
setting timer.

Displays the order of timer operation.

Displays whether timer is on or off.

SET TEMPERATURE button sets any desired
room temperature.

TIMER CONTROL buttons

AUTO STOP (OFF timer): when this switch is
set, the air conditioner will be automatically
stopped at the preset time.
AUTO START (ON timer): when this switch is
set, the air conditioner will be automatically
started at the preset time.

Buttons used to set the “hour and minute” of
the current time and timer settings.

Changes left/right airflow direction.

(Not available for this model.)

operation

display

display

CLOCK display

TIMER display

“ ” “ ” display

“ ” “ ” display

button

h and min buttons

LOUVER button

CLOCK button

RESET button

SET button

Wired remote controller

Display Section

For purposes of this explanation,
all parts of the display are shown.
During actual operation, only
the relevant items will be lit.

Identifies the current operation

Shows the operating mode, etc.
*Multilanguage display is available.

“Centrally Controlled” indicator

Indicates that operation from the
remote controller has been prohib­ited by a master controller.

“Timer is Off” indicator

Indicates that the timer is off.

Temperature Setting

Shows the target temperature.

Operation Section

Temperature setting buttons

Down

Up

Timer Menu button
(Monitor/Set button)

Mode button (Return button)

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.

TIME SUN MON TUE WED THU FRI SAT
TIMER

AFTER

ERROR CODE

°F°C

Hr

AFTER

°F°C

ONLY1Hr.

Up/Down Air Direction indica­tor

The indicator shows the direc­tion of the outcoming airflow.

“One Hour Only” indicator

Displays if the airflow is set to
Low or downward during COOL
or DRY mode. (Operation varies
according to model.)
The indicator goes off in one hour,
at which time the airflow direction
also changes.

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.

ON

OFF

FUNCTION

FILTER

WEEKLY

SIMPLE

AUTO OFF

“Sensor” indication

Displays when the remote controller
sensor is used.

“Locked” indicator

Indicates that remote controller but­tons have been locked.

“Clean The Filter” indicator

To be displayed on when it is time to
clean the filter.

Timer indicators

The indicator comes on if the corre­sponding timer is set.

Fan Speed indicator

Shows the selected fan speed.

Ventilation indicator

Appears when the unit is running in
Ventilation mode.

ON/OFF button

Fan Speed button

Filter button
(<Enter> button)

Set Time buttons

Back

Ahead

Timer On/Off button
(Set Day button)

Opening the
cover

Note:

●

“PLEASE WAIT” message
This message is displayed for approximately 3 minutes when power is supplied to the indoor unit or when the unit is recovering from a power failure.

●

“NOT AVAILABLE” message
This message is displayed if an invalid button is pressed (to operate a function that the indoor unit does not have).
If a single remote controller is used to operate multiple indoor units simultaneously that are different types, this message will not be displayed as
far as any of the indoor units is equipped with the function.

TEMP.

MENU

BACK DAY

MONITOR/SET

PAR-21MAA

CLOCK

ON/OFF

33

ON/OFF

FILTER

CHECK

OPERATION

Built-in temperature sensor

CLEAR

TEST

Test Run button

Check button (Clear button)

Airflow Up/Down button

Louver button
( Operation button)

To return operation
number

Ventilation button
( Operation button)

To go to next operation
number

2

SPECIFICATION

2-1. Specifi cations

Model

Power source

Cooling capacity
(Nominal)

Power input

Heating capacity
(Nominal )

External finish
External dimension H × W × D

Net weight
Heat exchanger
Fan

Noise level (Low-High)
(measured in anechoic room)
Insulation material
Air filter
Protection device
Refrigerant control device
Connectable outdoor unit
Diameter of
refrigerant pipe

Field drain pipe size
Standard
attachment

Optional parts

Remarks

Current input

Power input
Current input

Type × Quantity

External

static press.

Motor type

Motor output

Driving mechanism

Airflow rate

(Low-High)

Liquid

Gas

Document
Accessory

External heater adapter

Installation

*1

*1

*2

*2

(R410A)

(R22)

(R410A)

(R22)

kW
Btu/h
kW
A
kW
Btu/h
kW
A

mm
in.
kg (lb)

Pa
mmH

2

kW

3

/min

m
L/s
cfm
dB <A>

mm (in.)

mm (in.)

mm (in.)

PKFY-P24NKMU-E

PKFY-P30NKMU-E

1-phase 208-230V 60Hz

7.0

24,000

0.04

0.29

7.9

27,000

0.04

0.29

8.8

30,000

0.06

0.43

10.0

34,000

0.06

0.43

Plastic, MUNSELL (1.0Y 9.2/0.2)

365 × 1170 × 295

14-3/8" × 46-1/16" × 11-5/8"

21 (46)

Cross fin (Aluminum fin and copper tube)

Line flow fan × 1

0

O

0

DC motor

0.056

Direct-drive

16 - 20
267 - 333
570 - 710

39 - 45

20 - 24
333 - 400
710 - 850

43 - 49

Polyethylene sheet

PP honeycomb

Fuse

LEV

R410A, R22 CITY MULTI

ø9.52 (ø3/8")

ø9.52 (ø3/8")
ø15.88 (ø5/8")
ø15.88 (ø5/8")

Flare
Flare
Flare
Flare

ø9.52 (ø3/8")

ø9.52 (ø3/8")
ø15.88 (ø5/8")
ø15.88 (ø5/8")

Flare
Flare
Flare
Flare

I.D. 16mm (5/8")

Installation Manual, Instruction Book

PAC-YU25HT

Details on foundation work, insulation work, electrical wiring, power source switch, and other items shall be referred to
the Installation Manual.

Note :

Pipe length :

Level difference :

* Due to continuing improvement, above specification may be subject to change without notice.

*1 Nominal cooling conditions

Indoor :

Outdoor :

80°FDB/67°FWB (26.7°CDB/19.4°CWB)
95°FDB (
25 ft. (7.6 m)
0 ft (

35°CDB)

0 m)

*2 Nominal heating conditions

70°FDB(21°CDB)
47°FDB/43°FWB (8.3°CDB/6.1°CWB)
25 ft. (7.6 m)
0 ft (0 m)

Unit converter

kcal/h = kW × 860
Btu/h = kW × 3,412

3

cfm = m
lb = kg/0.4536

*Above specification data is
subject to rounding variation.

/min × 35.31

4

2-2. Electrical parts specifi cations

Service Ref.

Parts name

Room temperature
thermistor

Liquid pipe thermistor

Gas pipe thermistor

Fuse
(Indoor controller board)

Fan motor

Vane motor
(with limit switch)

Linear expansion valve

Power supply terminal
block

Transmission terminal
block

MA remote controller
terminal block

2-3. Sound levels

Symbol

TH21

TH22

TH23
TH24

FUSE

MF

MV

LEV

TB2

TB5

TB15

PKFY-P24NKMU-E.TH

PKFY-P30NKMU-E.TH

Resistance 30°F/15.8k, 50°F/9.6k, 70°F/6.0k, 80°F/4.8k, 90°F/3.9k, 100°F/3.2k

Resistance 30°F/15.8k, 50°F/9.6k, 70°F/6.0k, 80°F/4.8k, 90°F/3.9k, 100°F/3.2k

Resistance 30°F/15.8k, 50°F/9.6k, 70°F/6.0k, 80°F/4.8k, 90°F/3.9k, 100°F/3.2k

250V 3.15A

8-Pole Output 56W / RCOJ56-AC

MSBPC20 DC12V

EFM-40YGME

DC 12 V

EFM-80YGME

DC 12 V

(L1, L2, GR) 250V 20A

(M1, M2, S) 250V 20A

(1, 2) 250V 10A

3.3 ft.

(1m)

Measurement location

* Measured in anechoic room.

2-4. NC curves

PKFY-P24NKMU-E

External static pressure : 0Pa
Power source : 208,230V, 60Hz

70.0

MPa

65.0

60.0

55.0

50.0

45.0

40.0

35.0

30.0

25.0

Approximate minimum

20.0

audible limit on
continuous noise

15.0

10.0

OCTAVE BAND PRESSURE LEVEL (dB) 0dB = 20

63 125 250 500 1k 2k 4k 8k

OCTAVE BAND CENTER FREQUENCIES(Hz)

High speed
Low speed

3.3 ft.
(1m)

PKFY-P30NKMU-E

External static pressure : 0Pa
Power source : 208,230V, 60Hz

70.0

65.0

NC60

NC50

NC40

NC30

NC20

60.0

55.0

50.0

45.0

40.0

35.0

30.0

25.0

Approximate minimum

20.0

audible limit on
continuous noise

15.0

10.0

OCTAVE BAND PRESSURE LEVEL (dB) 0dB = 20MPa

63 125 250 500 1k 2k 4k 8k

OCTAVE BAND CENTER FREQUENCIES(Hz)

Service Ref.

PKFY-P24NKMU-E.TH

PKFY-P30NKMU-E.TH

High speed
Low speed

Sound level at anechoic room : Low-High

Sound level dB (A)

39 - 45

43 - 49

NC60

NC50

NC40

NC30

NC20

55

3

OUTLINES AND DIMENSIONS

PKFY-P24NKMU-E.TH
PKFY-P30NKMU-E.TH

Left side

Knockout hole
for left piping

A

1-1/4(32)

23/32(18)

2-3/32(53)

1-3/16(30)

1-3/8(35)

2-19/32(66)

2-9/16(65.2)

5-17/132(140.3)

7/16(11)

14-3/8(365)

16-11/16(423.7)

Filter hook

33-21/32(855)2-29/32(74)

Front side(Grille open)

Top side

17(431.7)

Front side

46-1/16(1170)

17-15/32(444)Gas pipe

18-31/32(482)Liquid pipe

23-1/32(585)Drain hose

Under side

9-1/2(241)







Operation lamp

DEFROST/STAND BY lamp

Receiver

Terminal block for power supply

Terminal block for transmission

Terminal block for
MA-remote controller

Emergency operation switch
(cooling/heating)

4-27/32(123)

6-1/16(154)

5-9/32(134)

Right side

11-5/8(295)

Unit : inch (mm)

Mount board

C

3/16(5)

Knockout hole
for right piping

Sleeve
(purchased locally)

Min.9/32(7)

:2-15/16
(:75)

Required space(Indoor unit)

Min.8-21/32(220)

Min.2-1/16(52.3)

75-:3/16(:5.1)
Tapping
screw hole

5/8(15.5)

31/32(25)
1-31/32(50)
2-15/16(75)

3-15/16(100)
4-19/32(117)

4-29/32(125)

5-19/32(142)

7-9/16(192)
9-17/32(242)

11(279.5)

11-1/2(292)

Through hole

:2-15/16~:3-5/32
(:75~:80)

4-:11/3 2(:9) Bolt hole

20-3/8(517.4)

0

23-1/32(585)

20-7/8(530.5)

Vane(auto)

Min.3-31/32(100.5)

17-9/32(439)

17-7/8(454)

16-3/32(408.5)

15-1/8(384)

16-15/16(430.5)

Wall hole for
left rear piping

14-11/32(364)

12-3/8(314)

15-1/8(384)

13-11/32(339)

Air inlet

Air outlet

0

7-7/16(189)

Knockout hole for
rear piping
2-15/16×18-29/32(75×480)

Louver (manual)

Knockout hole
for lower piping

Min.1-7/8(48)

Min.9-27/32(250)

Center measurement hole
:3/32(:2.5)

2-1/8(54)

1/8(3)

0

13/32(10)

4-11/32(110)

2-3/8(60)

13/32(10)

2-3/8(60)

0

Mount board

4-11/32(110)

Wall hole for
right rear piping

C

2-9/16(65)

12-3/8(314)

R1-15/32(R37.5)

8-17/32(216.5)

2-5/8(67)

3-1/32(77)

15-1/8(384.5)

14-11/32(364)

13-11/32(339)

13-3/4(349.2)

5/16(7.8)

18-5/16(465.5)

17-7/8(454)

16-3/32(408.5)

17-9/32(439)

15-1/8(384)

17-11/16(449.2)

2-9/16(65)

Piping connection

 Liquid pipe

BB

 Gas pipe

 Drain hose

Knockout hole for piping

B

3-1/32(77)
3-7/16(87)

13/32(10.7)

Indoor unit outline

2-1/8(54)
1-1/4(32)
31/32(25)

1/2(12.5)
0
1/2(12.5)
1-15/32(37.5)

2-15/32(62.5)

3-7/16(87.5)

4-1/8(104.5)

5-3/32(129.5)

6-9/16(167)

8-17/32(217)

9-1/32(229.5)
10-13/32(264)

11-1/2(292)

12-5/32(308.5)
12-1/4(311)

23-1/32(585)

Refrigerant pipe: 3/8 O.D(:9.52)

Flared connection: 3/8F

Refrigerant pipe: 5/8 O.D(:15.88)

Flared connection: 5/8F

5/8(:16) O.D

A

3-1/32(77)

2-5/8(67)

5/16(7.8)

2-9/16(65)

6

WIRING DIAGRAM4

PKFY-P24NKMU-E.TH PKFY-P30NKMU-E.TH

SYMBOL

INDOOR CONTROLLER BOARD

I.B

CONNECTOR

CN24
CN32
CN51
CN52

BUZZER

BZ

SURGE ABSORBER

DSA

FUSE (T3.15AL 250V)

FUSE

POWER SUPPLY (I.B)

LED1

POWER SUPPLY (I.B)

LED2

SWITCH

SW2
SW3
SW4
SWE

AUX.RELAY DRAIN PUMP

X1

VARISTOR

MOV 01,02

LINER EXPANSION VALVE

LEV

FAN MOTOR

MF

VANE MOTOR

MV

TERMINAL

TB2

BLOCK

TB5
TB15

NAME

EXTERNAL HEATER
REMOTE SWITCH
CENTRALLY CONTROL
REMOTE INDICATION

CAPACITY CODE
MODE SELECTION
MODE SELECTOR
DRAIN PUMP (TEST MODE)

POWER SUPPLY
TRANSMISSION
MA-REMOTE CONTROLLER

SYMBOL

TH21

THERMISTOR

TH22

TH23

TH24

A.B ADDRESS BOARD
SWA SWITCH
SW1
SW11
SW12
SW14
S.B SWITCH BOARD
SWE1 EMERGENCY OPERATION (HEAT)
SWE2 EMERGENCY OPERATION (COOL)
W.B

PCB FOR WIRELESS REMOTE CONTROLLER
LED1 LED (OPERATION INDICATION: GREEN)
LED2 LED (OPERATION INDICATION: ORANGE)
RU RECEIVING UNIT

NAME

ROOM TEMP. DETECTION
(32°F/15kΩ, 77°F/5.4kΩ)
PIPE TEMP. DETECTION/LIQUID
(32°F/15kΩ, 77°F/5.4kΩ)
PIPE TEMP. DETECTION/GAS1
(32°F/15kΩ, 77°F/5.4kΩ)
PIPE TEMP. DETECTION/GAS2
(32°F/15kΩ, 77°F/5.4kΩ)

FAN SPEED SELECTOR
MODE SELECTION
ADDRESS SETTING 1s DIGIT
ADDRESS SETTING 10ths DIGIT
BRANCH No.

For the detail, refer to Fig. 1.

<Fig. 1>

See Fig. 1.

The black square (■) indicates
a switch position.

7

5

REFRIGERANT SYSTEM DIAGRAM

PKFY-P24NKMU-E.TH PKFY-P30NKMU-E.TH

Heat exchanger

Room temparature thermistor TH21

Item

Gas pipe

Liquid pipe

Gas pipe thermistor (1) TH23

Gas pipe thermistor (2) TH24

Liquid pipe thermistor TH22

Linear expansion valve

Strainer1 (#50mesh)
Strainer2 (#100mesh)

Model

PKFY-P24NKMU-E

:15.88 (5/8)

:9.52 (3/8)

Strainer (#50mesh)

Gas pipe

Flare connection

Liquid pipe

Strainer (#100mesh)

Unit : mm (inch)

PKFY-P30NKMU-E

:15.88 (5/8)

:9.52 (3/8)

8