Mitsubishi Electric City Multi PLFY-P08NCMU-E, City Multi PLFY-P12NCMU-E, City Multi PLFY-P15NCMU- Service Manual

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

TECHNICAL & SERVICE MANUAL

R410A / R22

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

June 2009

No. OCH410

REVISED EDITION-B

Revision:

• PLFY-P08/12/15NCMU­ER2.TH are added in
REVISED EDITION-B.

• Some descriptions have
been modified.

• Please void OCH410
REVISED EDITION-A.

PLFY-P12NCMU-E1.TH

PLFY-P12NCMU-ER2.TH

PLFY-P15NCMU-E PLFY-P15NCMU-E.TH

PLFY-P15NCMU-E1.TH

PLFY-P15NCMU-ER2.TH

CONTENTS

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Model name

indication

INDOOR UNIT

1. TECHNICAL CHANGES

2. FEATURES

3. PART NAMES AND FUNCTIONS

4. SPECIFICATIONS

5. 4-WAY AIR FLOW SYSTEM

6. OUTLINES AND DIMENSIONS

7. WIRING DIAGRAM

8.

REFRIGERANT SYSTEM DIAGRAM

9. MICROPROCESSOR CONTROL

10. TROUBLESHOOTING

11. DISASSEMBLY PROCEDURE

................................................................

PARTS CATALOG (OCB410)

NOTE:

• This manual describes

only service data of the
indoor units.

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2

3

4

6

9
11
12

14
15
22
29

1

TECHNICAL CHANGES

PLFY-P08NCMU-E1.TH PLFY-P08NCMU-ER2.TH
PLFY-P12NCMU-E
PLFY-P15NCMU-E

• The following functions 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

1.TH PLFY-P12NCMU-ER2.TH

1.TH PLFY-P15NCMU-ER2.TH

PLFY-P08NCMU-E.TH PLFY-P08NCMU-E1.TH
PLFY-P12NCMU-E.TH PLFY-P12NCMU-E
PLFY-P15NCMU-E.TH PLFY-P15NCMU-E

• PANEL has been changed.
SLP-15AAU (White : 0.70Y 8.59/0.97) → SLP-15AAUW (Pure white : 6.4Y 8.9/0.4)

1.TH

1.TH

2

2

FEATURES

Models

Cooling capacity / Heating capacity

PLFY-P08NCMU-E 8,000 / 9,000 Btu/h
PLFY-P12NCMU-E 12,000 / 13,500 Btu/h
PLFY-P15NCMU-E 15,000 / 17,000 Btu/h

Indoor Unit

1. PERFECT PANEL SIZE

The brand new 22-7/16 inch PLFY-P08/12/15NCMU-E models are slim, attractive, yet poweful units.
PLFY-P08/12/15NCMU-E’s size and shape, which perfectly match 2-by-2 ceilings, and its lighter weight of 34 lbs

(PLFY-P08NCMU-E) make installation even easier and more convenient.

2. 29 dB WHISPER-QUIET OPERATION (PLFY-P08NCMU-E)

Ideal for cafés, bars, restaurants, and shops. Give all your customers the comfortable environment they deserve.

3. 2,500 HOUR LONG LIFE FILTER

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 installa­tion easy and maintenance trouble-free.

Unit : inch

20-7/8

Suspension bolt pitch

16-17/32

Unit 22-7/16

22-7/16

T-bar

22-11/16

23-5/8

Ceiling surface

8-3/16

9-1/4

3

3

PAR-21MAA

ON/OFF

FILTER

CHECK

OPERATION

CLEAR

TEST

TEMP.

MENU

BACK DAY

MONITOR/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
( Operation button)

To go to next operation
number

Built-in temperature sensor

PART NAMES AND FUNCTIONS

Indoor (Main) Unit

Horizontal Air Outlet
Sets horizontal airflow automatically

during cooling or dehumidifying.

Filter
Removes dust and pollutants

from return air.

Grille

Auto Air Swing Vane
Disperses airflow up and

down and adjusts the angle
of airflow direction.

Air Intake
Returns air from room.

Wired remote controller

Once the controllers are set, the same operation mode can be repeated by simply pressing the ON/OFF button.

4

Wired remote controller

Display Section

For purposes of this explanation,
all parts of the display are shown
as lit. 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.

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

Shows the direction of the
outcoming airflow.

“One Hour Only” indicator

Displayed 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,
when 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

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

46°F or 102°F

or more.

“Sensor” indication

Displayed 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.

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.

5

4

SPECIFICATIONS

4-1. SPECIFICATIONS

Item

Power

Cooling capacity

Heating capacity

Cooling

Input

Heating

Cooling

Current

Electric characteristic

(munsell symbol)

Dimensions

Heat exchanger

F a n

Pipe

dimensions

Field drain pipe size

Noise level 3

Product weight

Heating

Exterior

Height

Width

Depth

Fan × No.

Air flow

DRY

3

WET

External

static pressure

Fan motor

output

Insulator

Air filter

Gas
side

Liquid

side

V·Hz

Btu/h

Btu/h

kW

kW

A

A

—

in

in

in

—

—

CFM

CFM

Pa

kW

—

—

in

in

in

dB

lb

PLFY-P08NCMU-E.TH

PLFY-P08NCMU-E

1.TH

PLFY-P08NCMU-ER2.TH

8,000

9,000

0.05

0.05

0.23

0.23

Unit : Galvanized sheets with gray heat insulation

Grilles : ABS resin Munsell<0.7Y 8.59/0.97>(PLFY-P·NCMU-E.TH) / <6.4Y 8.9/0.4>(PLFY-P·NCMU-E

280-320-350

250-290-320

0.015

29-32-38

34<7>

PLFY-P12NCMU-E.TH

PLFY-P12NCMU-E1.TH

PLFY-P12NCMU-ER2.TH

Single phase 208/230V 60Hz

Note 1. Rating conditions
Cooling : Indoor : D.B. 80°F W.B. 67°F
outdoor : D.B. 95°F W.B. 75°F
Heating : Indoor : D.B. 70°F
outdoor : D.B. 47°F W.B. 43°F
Note 2. The number indicated in < > is for the grille.

W 3. Air flow and the noise level are indicated as Low - Medium - High.

12,000

13,500

0.06

0.06

0.28

0.28

8-3/16<25/32>

22-7/16<25-19/32>

22-7/16<25-19/32>

Cross fin

Turbo fan × 1

0

Polyethylene sheet

PP honey comb fabric

1/2"

1/4"

O.D1-1/4"

30-34-39

PLFY-P15NCMU-E.TH

PLFY-P15NCMU-E1.TH

PLFY-P15NCMU-ER2.TH

15,000

17,000

0.06

0.06

0.28

0.28

1/ER2.TH)

320-350-390

290-320-350

0.020

31-35-40

37<7>

6

4-2. NOISE CRITERION CURVES

PLFY-P08NCMU-E.TH
PLFY-P08NCMU-E

1.TH

PLFY-P08NCMU-ER2.TH

90

80

70

60

50

40

30

APPROXIMATE

20

THRESHOLD OF

OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 μbar)

HEARING FOR
CONTINUOUS
NOISE

10

63 125 250 500 1000 2000 4000 8000

BAND CENTER FREQUENCIES, Hz

NOTCH

High

Medium

Low

SPL(dB)32LINE

38

29

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

PLFY-P12NCMU-E.TH
PLFY-P12NCMU-E

1.TH

PLFY-P12NCMU-ER2.TH

90

80

70

60

50

40

30

APPROXIMATE

20

THRESHOLD OF

OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 μbar)

HEARING FOR
CONTINUOUS
NOISE

10

63 125 250 500 1000 2000 4000 8000

BAND CENTER FREQUENCIES, Hz

NOTCH

High

Medium

Low

SPL(dB)34LINE

39

30

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

PLFY-P15NCMU-E.TH
PLFY-P15NCMU-E

1.TH

PLFY-P15NCMU-ER2.TH

90

80

70

60

50

40

30

APPROXIMATE

20

THRESHOLD OF

OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 μbar)

HEARING FOR
CONTINUOUS
NOISE

10

63 125 250 500 1000 2000 4000 8000

BAND CENTER FREQUENCIES, Hz

NOTCH

High

Medium

Low

SPL(dB)35LINE

40

31

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

UNIT

CEILING

5ft

MICROPHONE

NOTE: The sound level is measured in an anechoic

room where echoes are few, when compres­sor stops. The sound may be bigger than the
indicated level in actual use due to surround­ing echoes. The sound level can be higher by
about 2 dB than the indicated level during cool­ing and heating operation.

7

4-3. ELECTRICAL PARTS SPECIFICATIONS

Model

Parts name
Thermistor

(Room temperature
detection)

Thermistor
(Pipe temperature
detection/ Liquid)

Thermistor
(Pipe temperature
detection/ Gas)

Fuse
(Indoor controller board)

Fan motor
(with Thermal fuse)

Fan motor capacitor

Vane motor

Drain pump

Symbol

TH21

TH22

TH23

FUSE

MF

C1

MV

DP

PLFY-P08NCMU-E.TH

PLFY-P08NCMU-E

1.TH

PLFY-P08NCMU-ER2.TH

PLFY-P12NCMU-E.TH

PLFY-P12NCMU-E

1.TH

PLFY-P12NCMU-ER2.TH

PLFY-P15NCMU-E.TH

PLFY-P15NCMU-E

1.TH

PLFY-P15NCMU-ER2.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 6.3A

6-pole OUTPUT 15W

PK6N15-LA

6-pole OUTPUT 20W

PK6N20-LA

6-pole OUTPUT 20W

PK6N21-LA

Thermal fuse OFF 284F $ 36F

1.5 × 440V

MSBPC20M13

DC12V 300



/phase

PLD-12230ME-1

INPUT 12/10.8W 241/Hr

Drain sensor

Linear expansion valve
[coil]

Electric heater
(Condensation proof)

Power supply terminal
block

Transmission terminal
block

MA remote controller
terminal block

DS

LEV

H2

TB2

TB5

TB15

Thermistor resistance 30F/6.3k, 50F/3.9k, 70F/2.5k, 80F/2.0k, 90F/1.6k, 100F/1.3k

DC12V Stepping motor drive, Port dimension :3.2 (0~2000pulse)

+Note: Refer to WIRING DIAGRAM for the supplied voltage.

EDM-40YGME

240V 15W

(L1, L2,GR) Rated to 330V 30A +

(M1, M2, S) Rated to 250V 20A +

(1, 2) Rated to 250V 10A +

8

5

4-WAY AIR FLOW SYSTEM

5-1. FRESH AIR INTAKE (Location for installation)

At the time of installation, use the duct holes (cut out) located at the positions shown in following diagram, as and when required.

Fresh air intake

Refrigerant pipe

Electrical Box

Drain pipe

Fresh air intake hole diagram (Unit : inch)

3 - W1/8
Burring hole

4-21/32

120"

W3-15/16
Burring hole pitch

"

120

W2-7/8
(Cut out hole)

Ceiling surface

5-2. FRESH AIR INTAKE AMOUNT & STATIC PRESSURE CHARACTERISTICS

PLFY-P08NCMU-E(1).TH PLFY-P12NCMU-E(1).TH PLFY-P15NCMU-E(1).TH
PLFY-P08NCMU-ER2.TH PLFY-P12NCMU-ER2.TH PLFY-P15NCMU-ER2.TH

Taking air into the unit

Static pressure : P [in. W.G.%10-2]

20

20 40 60 80 100 120

0

-20

-40

-60

-80

-100

-120

NOTE: Fresh air intake amount should be 20% or less of

whole air amount to prevent dew dripping.

Air flow : Q [CFM]

How to read curves

Q

Duct characteristics
at site

A

C

B

A

EC

AD

Curve in the

1

left graphs

0

2

3

Q

Qa

Q

Q…Designed amount of fresh air intake
<CFM>
A…Static pressure loss of fresh air

intake duct system with air flow
amount Q <in. W.G.o10-2>

B…Forced static pressure at air condi-

tioner inlet with air flow amount Q
<in. W.G.o10
C…Static pressure of booster fan with

air flow amount Q <in. W.G.o10-2>
D…Static pressure loss increase

amount of fresh air intake duct sys-

tem for air flow amount Q
<in. W.G.o10
E…Static pressure of indoor unit with

air flow amount Q <in. W.G.o10-2>
Qa…Estimated amount of fresh air

intake without D <CFM>

-2

>

-2

>

5-3.

OPERATION IN CONJUNCTION

WITH DUCT FAN (BOOSTER FAN)

• Whenever the indoor unit is operating, the duct
fun also operates.

(1) Connect the optional multiple remote control-

ler adapter (PAC-SA88HA-E) to the connector
CN51 on the indoor controller board.

(2) Drive the relay after connecting the 12V DC

relay between the Yellow and Orange con­nector wires.

(*) Use a relay of 1W or smaller.

MB: Electromagnetic switch power relay for duct

fan.

X: Auxiliary relay (For DC 12V, coil rating : 1.0W

or below)

CN51
on
indoor unit
board

Indoor unit side

Indoor controller board

Multiple remote
controller adapter
PAC-SA88HA-E

9

5

1

Connector (5P)

CN51

Be sure to secure insulation

Green

material by tape, etc.

Red

Brown

Multiple remote
controller adapter
PAC-SA88HA-E

CN51

Yellow

Orange

~

MB

Installation at site

Be sure to secure insulation
material by tape, etc.

Distance between indoor
controller board and relay
must be within 33ft.

5-4. FIXING HORIZONTAL VANE

Horizontal vane of each air outlet can be fixed according to the environment where it is installed.

Setting procedure

1) Turn off a main power supply (Turn off a breaker).

2) Disconnect the vane motor connector of the direction of the arrow with pressing the unlocking button as shown in figure
below.

Insulate the disconnected connector with the plastic tape.

Vane motor

Vane motor

Connector

Unlocking button

Horizontal vane

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

A

· The vanes can be set between 21mm, 13/16 inch and 30 mm, 1-3/16 inch.

Horizontal 30° Downward 45° Downward 55° Downward 70°

21 mm

13/16 inch

25 mm

31/32 inch

28 mm

1-3/32 inch

30 mm

1-3/16 inch

Caution:
Do not set the up/down vanes passed the specified range. Condensation could form and drop from the ceiling,
or the unit could malfunction.

10