Mitsubishi Electric City Multi PLFY-P08NCMU-E Operating manual

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
TECHNICAL & SERVICE MANUAL
INDOOR UNIT
CONTENTS
1. TECHNICAL CHANGES........................................... 2
2. FEATURES................................................................3
3. PART NAMES AND FUNCTIONS............................. 4
4. SPECIFICATIONS.....................................................6
5. 4-WAY AIR FLOW SYSTEM......................................9
6. OUTLINES AND DIMENSIONS...............................11
7. WIRING DIAGRAM..................................................12
8. REFRIGERANT SYSTEM DIAGRAM
........................14
9. MICROPROCESSOR CONTROL...........................15
10. TROUBLESHOOTING............................................. 22
11. DISASSEMBLY PROCEDURE................................29
R410A / R22
No. OCH410
REVISED EDITION-B
June 2009
NOTE:
• This manual describes
only service data of the
indoor units.
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
PLFY-P12NCMU-E1.TH
PLFY-P12NCMU-ER2.TH
PLFY-P15NCMU-E PLFY-P15NCMU-E.TH
PLFY-P15NCMU-E1.TH
PLFY-P15NCMU-ER2.TH
PARTS CATALOG (OCB410)
Revision:
• PLFY-P08/12/15NCMU-
ER2.TH are added in
REVISED EDITION-B.
• Some descriptions have
been modified.
• Please void OCH410
REVISED EDITION-A.
Model name
indication

2
1TECHNICAL CHANGES
PLFY-P08NCMU-E1.TH PLFY-P08NCMU-ER2.TH
PLFY-P12NCMU-E1.TH PLFY-P12NCMU-ER2.TH
PLFY-P15NCMU-E1.TH PLFY-P15NCMU-ER2.TH
• 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
PLFY-P08NCMU-E.TH PLFY-P08NCMU-E1.TH
PLFY-P12NCMU-E.TH PLFY-P12NCMU-E1.TH
PLFY-P15NCMU-E.TH PLFY-P15NCMU-E1.TH
• PANEL has been changed.
SLP-15AAU (White : 0.70Y 8.59/0.97) →SLP-15AAUW (Pure white : 6.4Y 8.9/0.4)

3
2FEATURES
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 installa-
tion easy and maintenance trouble-free.
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
Ceiling surface
9-1/4
8-3/16
Unit 22-7/16
T-bar
20-7/8
16-17/32
22-7/16
Suspension bolt pitch
22-11/16
23-5/8
Unit : inch

4
Auto Air Swing Vane
Disperses airflow up and
down and adjusts the angle
of airflow direction.
Grille
Filter
Removes dust and pollutants
from return air.
Horizontal Air Outlet
Sets horizontal airflow automatically
during cooling or dehumidifying.
Air Intake
Returns air from room.
3PART NAMES AND FUNCTIONS
Indoor (Main) Unit
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
Wired remote controller
Once the controllers are set, the same operation mode can be repeated by simply pressing the ON/OFF button.

5
Wired remote controller
●
●
°F°C
°F°C
ERROR CODE
AFTER
TIMER
TIME SUN MON TUE WED THU FRI SAT
ON
OFF
Hr
AFTER
FILTER
FUNCTION
ONLY1Hr.
WEEKLY
SIMPLE
AUTO OFF
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.
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 prohib-
ited 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.
“Sensor” indication
Displayed when the remote controller
sensor is used.
“Locked” indicator
Indicates that remote controller but-
tons 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 corre-
sponding timer is set.
Up/Down Air Direction indica-
tor
Shows the direction 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
Shows the selected fan speed.
Ventilation indicator
Appears when the unit is running in
Ventilation mode.
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.

6
4SPECIFICATIONS
4-1. SPECIFICATIONS
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.
W3. Air flow and the noise level are indicated as Low - Medium - High.
Item
Btu/h
Btu/h
kW
kW
A
A
—
in
in
in
—
—
CFM
CFM
Pa
kW
—
—
in
in
in
dB
lb
Cooling capacity
Power
Heat exchanger
Insulator
Air filter
Fan × No.
Pipe
dimensions
Field drain pipe size
Noise level 3
Product weight
Exterior
(munsell symbol)
Fan motor
output
External
static pressure
Liquid
side
Gas
side
Heating capacity
Dimensions
Height
Width
Depth
Electric characteristic
Input
Cooling
Heating
Cooling
Heating
Current
PLFY-P08NCMU-E.TH
PLFY-P08NCMU-E1.TH
PLFY-P08NCMU-ER2.TH
8,000
9,000
0.05
0.05
0.23
0.23
280-320-350
250-290-320
0.015
29-32-38
34<7>
15,000
17,000
0.06
0.06
0.28
0.28
31-35-40
12,000
13,500
0.06
0.06
0.28
0.28
30-34-39
Single phase 208/230V 60Hz
V·Hz
Air flow
3
DRY
WET
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-E1/ER2.TH)
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"
8-3/16<25/32>
320-350-390
290-320-350
0.020
37<7>
F a n
PLFY-P12NCMU-E.TH
PLFY-P12NCMU-E1.TH
PLFY-P12NCMU-ER2.TH
PLFY-P15NCMU-E.TH
PLFY-P15NCMU-E1.TH
PLFY-P15NCMU-ER2.TH

7
UNIT
5ft
MICROPHONE
CEILING
4-2. NOISE CRITERION CURVES
90
80
70
60
50
40
30
20
10
63 125 250 500 1000 2000 4000 8000
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 μbar)
BAND CENTER FREQUENCIES, Hz
High
Medium
39
SPL(dB)
34
LINE
NOTCH
Low 30
PLFY-P12NCMU-E.TH
PLFY-P12NCMU-E1.TH
PLFY-P12NCMU-ER2.TH
90
80
70
60
50
40
30
20
10
63 125 250 500 1000 2000 4000 8000
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 μbar)
BAND CENTER FREQUENCIES, Hz
High
Medium
40
SPL(dB)
35
LINE
NOTCH
Low 31
PLFY-P15NCMU-E.TH
PLFY-P15NCMU-E1.TH
PLFY-P15NCMU-ER2.TH
90
80
70
60
50
40
30
20
10
63 125 250 500 1000 2000 4000 8000
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 μbar)
BAND CENTER FREQUENCIES, Hz
PLFY-P08NCMU-E.TH
PLFY-P08NCMU-E1.TH
PLFY-P08NCMU-ER2.TH
High
Medium
38
SPL(dB)
32
LINE
NOTCH
Low 29
NOTE: The sound level is measured in an anechoic
room where echoes are few, when compres-
sor stops. The sound may be bigger than the
indicated level in actual use due to surround-
ing echoes. The sound level can be higher by
about 2 dB than the indicated level during cool-
ing and heating operation.

8
4-3. ELECTRICAL PARTS SPECIFICATIONS
Parts name
Model
Symbol
TH21
TH22
TH23
FUSE
MF
C1
MV
DP
DS
LEV
H2
TB2
TB5
TB15
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
PLFY-P08NCMU-E.TH
PLFY-P08NCMU-E1.TH
PLFY-P08NCMU-ER2.TH
PLFY-P12NCMU-E.TH
PLFY-P12NCMU-E1.TH
PLFY-P12NCMU-ER2.TH
PLFY-P15NCMU-E.TH
PLFY-P15NCMU-E1.TH
PLFY-P15NCMU-ER2.TH
Thermistor
(Room temperature
detection)
Thermistor
(Pipe temperature
detection/ Liquid)
Thermistor
(Pipe temperature
detection/ Gas)
Fuse
(Indoor controller board)
Fan motor
(with Thermal fuse)
Electric heater
(Condensation proof)
Power supply terminal
block
Transmission terminal
block
MA remote controller
terminal block
6-pole OUTPUT 15W
PK6N15-LA
6-pole OUTPUT 20W
PK6N21-LA
6-pole OUTPUT 20W
PK6N20-LA
Fan motor capacitor
Vane motor
Drain pump
Drain sensor
Linear expansion valve
[coil]
+Note: Refer to WIRING DIAGRAM for the supplied voltage.
Thermal fuse OFF 284F$36F
1.5× 440V
MSBPC20M13
DC12V 300
 /phase
PLD-12230ME-1
INPUT 12/10.8W 241/Hr
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)
EDM-40YGME
240V 15W
(L1, L2,GR) Rated to 330V 30A +
(M1, M2, S) Rated to 250V 20A +
(1, 2) Rated to 250V 10A +

9
54-WAY AIR FLOW SYSTEM
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 con-
nector 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)
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.
Refrigerant pipe Drain pipe
Electrical Box
Fresh air intake Fresh air intake hole diagram (Unit : inch)
3 - W1/8
Burring hole W3-15/16
Burring hole pitch
W2-7/8
(Cut out hole)
Ceiling surface
120"
120"
4-21/32
Static pressure : P [in. W.G.%10-2]
Air flow : Q [CFM]
20
-20
-40
-60
-80
-100
-120
020 40 60 80 100 120
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
5-2. FRESH AIR INTAKE AMOUNT & STATIC PRESSURE CHARACTERISTICS
Q
0
BA
C
1Curve in the
left graphs
Duct characteristics
at site
Q
A
EC
2
Q
Qa
AD
3
NOTE: Fresh air intake amount should be 20% or less of
whole air amount to prevent dew dripping.
CN51
Multiple remote
controller adapter
PAC-SA88HA-E
Indoor controller board
Distance between indoor
controller board and relay
must be within 33ft.
Be sure to secure insulation
material by tape, etc.
5Green
Yellow
Orange
Connector (5P)
Indoor unit side Multiple remote
controller adapter
PAC-SA88HA-E
Be sure to secure insulation
material by tape, etc.
Installation at site
CN51
on
indoor unit
board
Red
Brown
1
~
CN51
MB
How to read curves
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.o10-2>
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.o10-2>
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>

10
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
Horizontal vane
Connector Unlocking button
Vane motor
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 Horizontal 30° Downward 45° Downward 55° Downward 70°
A21 mm
13/16 inch
25 mm
31/32 inch
28 mm
1-3/32 inch
30 mm
1-3/16 inch
· The vanes can be set between 21mm, 13/16 inch and 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.