Mitsubishi Electric Mr.Slim PLY-P18BA.TH User manual

SERVICE MANUAL
CONTENTS
1. REFERENCE MANUAL .................................. 2
2. SAFETY PRECAUTION .................................. 3
3. PARTS NAMES AND FUNCTIONS ................ 4
4. SPECIFICATIONS ......................................... 12
5. NOISE CRITERION CURVES ....................... 14
6. OUTLINES AND DIMENSIONS..................... 15
7. WIRING DIAGRAM........................................ 16
8. REFRIGERANT SYSTEM DIAGRAM ........... 17
9. TROUBLESHOOTING................................... 18
10. SPECIAL FUNCTION .................................... 33
11. DISASSEMBLY PROCEDURE...................... 40
April 2014
WIRED REMOTE
CONTROLLER
WIRELESS REMOTE
CONTROLLER
ON/OFF TEMP
ON/OFF
TEMP.
PARTS CATALOG (OCB551)
No. OCH551
REVISED EDITION-A
Note:
• This manual describes ser-
vice data of the indoor units
only .
• RoHS compliant products
have <G> mark on the
spec name plate.
INDOOR UNIT
Model name
indication
Series PLY
Indoor unit
[Model Name]
PLY-P18BA
PLY-P24BA
PLY-P30BA
PLY-P36BA
PLY-P42BA
PLY-P48BA
[Service Ref.]
PLY-P18BA.TH
PLY-P24BA.TH
PLY-P30BA.TH
PLY-P36BA.TH
PLY-P42BA.TH
PLY-P48BA.TH
SPLIT-TYPE AIR CONDITIONERS
(Option)
Revision:
• Added
PLY-P42BA.TH and
PLY-P48BA.TH in
REVISED EDITION-A.
• Some descriptions has
been modified.
• Please void OCH551.

23
1REFERENCE MANUAL
1-1. OUTDOOR UNIT’S SERVICE MANUAL
1-2. TECHNICAL DATA BOOK
Service Ref Service Manual No.
SUY-KA18/24/30/36VA.TH OCH552
OCB552
PUY-P42/48VKA.TH(-T)
PUY-P42/48YKA.TH(-T)
OCH558
OCB558
Series (Outdoor unit) Data Book No.
SUY-KA▪VA.TH OCS27
PUY-P▪VKA.TH
PUY-P▪YKA.TH OCS29
OCH551A

3
SAFETY PRECAUTION
2
Cautions for units utilising refrigerant R410A
CAUTIONS RELATED TO NEW REFRIGERANT
Use new refrigerant pipes.
Store the piping indoors and keep both ends of
the piping sealed until just before brazing.
(Leave elbow joints, etc. in their packaging.)
In case of using the existing pipes for R22, be careful with
the followings.
· Change flare nut to the one provided with this product.
Use a newly flared pipe.
· Avoid using thin pipes.
Charge refrigerant from liquid phase of gas
cylinder.
If the refrigerant is charged from gas phase, composition
change may occur in refrigerant and the efficiency will be
lowered.
Do not use refrigerant other than R410A.
If other refrigerant (R22 etc.) is used, chlorine in refrige-
rant can cause deterioration of refrigerant oil etc.
Use a vacuum pump with a reverse flow check
valve.
Vacuum pump oil may flow back into refrigerant cycle and
that can cause deterioration of refrigerant oil etc.
Use the following tools specifically designed for
use with R410A refrigerant.
The following tools are necessary to use R410A refrigerant.
Handle tools with care.
If dirt, dust or moisture enters 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 wrench
Gas leak detector
Charge hose
Tools for R410A
Contamination inside refrigerant piping can cause deterio-
ration of refrigerant oil etc.
If dirt, dust or moisture enters into refrigerant cycle, that can
cause deterioration of refrigerant oil or malfunction of com-
pressor.
If large amount of mineral oil enters, that can cause deterio-
ration of refrigerant oil etc.
Ventilate the room if refrigerant leaks during
operation. If refrigerant comes into contact with
a flame, poisonous gases will be released.
Make sure that the inside and outside of refrige-
rant piping is clean and it has no contaminants
such as sulfur, oxides, dirt, shaving particles, etc,
which are hazard to refrigerant cycle.
In addition, use pipes with specified thickness.
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 breakdown or accidents caused
by failure to follow the instructions.
Use the specified refrigerant only.
The refrigerant oil applied to flares and flange
connections must be ester oil, ether oil or
alkylbenzene oil in a small amount.
[1] Cautions for service
(1) Perform service after recovering the refrigerant left in unit completely.
(2) Do not release refrigerant in the air.
(3) After completing service, charge the cycle with specified amount of refrigerant.
(4) When performing service, install a filter drier simultaneously.
Be sure to use a filter drier for new refrigerant.
[2] Additional refrigerant charge
When charging directly from cylinder
· Check that cylinder for R410A available on the market is syphon type.
· Charging should be performed with the cylinder of syphon stood vertically. (Refrigerant is charged from liquid phase.)
OCH551A

4
Gravimeter
Unit
[3] Service tools
Use the below service tools as exclusive tools for R410A refrigerant.
3PARTS NAMES AND FUNCTIONS
Drain pipe
Filter
Vane
Gas pipe
Liquid pipe
Air outlet
i-see sensor
(option)
Air intake
(Intake grille)
No. Tool name Specifications
1Gauge manifold · Only for R410A
· Use the existing fitting specifications. (UNF1/2)
· Use high-tension side pressure of 5.3MPa·G or over.
2Charge hose · Only for R410A
· Use pressure performance of 5.09MPa·G or over.
3Electronic scale —
4Gas leak detector · Use the detector for R134a, R407C or R410A.
5Adaptor for reverse flow check · Attach on vacuum pump.
6Refrigerant charge base —
7Refrigerant cylinder · Only for R410A · Top of cylinder (Pink)
· Cylinder with syphon
8Refrigerant recovery equipment —
3-1. INDOOR UNIT
OCH551A

5
°F°C
°F°C
ERROR CODE
AFTER
TIMER
TIME SUN MON TUE WED THU FRI S AT
ON
OFF
Hr
AFTER
FILTER
FUNCTION
ONLY1Hr.
WEEKLY
SIMPLE
AUTO OFF
PAR-21MAA
ON/OFF
FILTER
CHECK
OPERATION
CLEAR
TEST
TEMP.
MENU
BACK DAY
MONITOR/SET
CLOCK
ON/OFF
l
l
Display Section
For the purpose of 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 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
Displays when the remote controller
sensor is used.
“Locked” indicator
Indicates that remote controller but-
tons have been locked.
“Clean The Filter” indicator
Displayed 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
The indicator shows the direc-
tion of the outgoing airflow.
“One Hour Only” indicator
Room Temperature display
Shows the room temperature. The room
temperature display range is 8–39:.
The display blinks if the temperature
is lower than 8:or 39:or higher.
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.
Operation Section
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
cover
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
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.
Built-in temperature sensor
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 1 hour,
when the airflow direction also
changes.
3-2. WIRED REMOTE CONTROLLER <PAR-21MAA>
OCH551A

6
ON/OFF TEMP
FAN
VANE
TEST RUN
AUTO STOP
AUTO START
h
min
LOUVER
MODE
CHECK
RESETSET CLOCK
MODEL SELECT
NOT AVAILABLE
CHECK TEST RUN
°C
AMPM
AMPM
VANE CONTROL button
Used to change the air flow direction.
CLOCK button
RESET button
SET button
ON/OFF button
The unit is turned ON and OFF alternately
each time the button is pressed.
MODE SELECT button
Used to switch the operation mode between
cooling, drying and fan mode.
CHECK-TEST RUN button
Only press this button to perform an inspection
check or test operation.
Do not use it for normal operation.
FAN SPEED SELECT button
Used to change the fan speed.
TIMER display
Displays when in timer operation or when
setting timer.
button
SET TEMPERATURE button sets any desired
room temperature.
CLOCK display
Displays the current time.
“ ” “ ” display
Displays the order of timer operation.
“ ” “ ” display
Displays whether timer is on or off.
Buttons used to set the “hour and minute” of
the current time and timer settings.
h and min buttons
display
display
FAN SPEED display indicates which fan speed
has been selected.
display
The vertical direction of air flow is indicated.
display
Blinks when model is selected.
display
display
CHECK and TEST RUN display indicate that
the unit is being checked or test-run.
display
OPERATION MODE display
Operation mode display indicates which
operation mode is in effect.
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.
MODEL SELECT
CHECK TEST RUN
LOUVER button
Changes left/right airflow direction.
(Not available for this model.)
SET TEMP. display indicates the desired
temperature which is set.
Lights up while the signal is transmitted to
the indoor unit when the button is pressed.
3-3. WIRELESS REMOTE CONTROLLER
OCH551A

7
Function buttons
F1 F2 F3 F4
Press to turn ON/OFF the indoor unit.
ON / OFF button
When the backlight is off, pressing any button turns
the backlight on and does not perform its function.
(except for the (ON / OFF) button)
The functions of the function buttons change depending on
the screen. Refer to the button function guide that appears
at the bottom of the LCD for the functions they serve on a
given screen.
When the system is centrally controlled, the button function
guide that corresponds to the locked button will not appear.
Press to save the setting.
SELECT button
Press to return to the previous screen.
RETURN button
Press to bring up the Main menu.
MENU button
Operation settings will appear.
When the backlight is off, pressing any button turns the
backlight on and it will stay lit for a certain period of time
depending on the screen.
Backlit LCD
This lamp lights up in green while the unit is in operation.
It blinks while the remote controller is starting up or when
there is an error.
ON / OFF lamp
Main display : Press to change the operation mode.
Main menu : Press to move the cursor down.
Function button F1
Main display : Press to decrease temperature.
Main menu : Press to move the cursor up.
Function button F2
Main display : Press to increase temperature.
Main menu : Press to go to the previous page.
Function button F3
Main display : Press to change the fan speed.
Main menu : Press to go to the next page.
Function button F4
Fri
Room
Set temp.
Mode Temp. Fan
Cool Auto
Main
Main display:
Cursor Page
Main menu
Vane·Louver·Vent. (Lossnay)
High power
Timer
Weekly timer
OU silent mode
<Main display> <Main menu>
Function guide
3-4. WIRED REMOTE CONTROLLER <PAR-31MAA> (Option)
The functions which can be used are restricted according to each model.
: Supported : Unsupported
Function PAR-31MAA PAR-21MAA
Body Product size H × W × D (mm) 120 × 120 × 19 120 × 130 × 19
LCD Full Dot LCD Partial Dot LCD
Backlight
Energy-saving Energy-saving operation schedule
Automatic return to the preset temperature
Restriction Setting the temperature range restriction
Function Operation lock function
Weekly timer
On / Off timer
Wired remote controller function
OCH551A

8
Fri
Mode Temp. Fan
Room
Cool Auto
Set temp.
Fri
Cool
Mode Temp. Fan
AutoSet temp.
Fri
Mode Temp. Fan
Room
Cool Auto
Set temp.
Fri
Cool
Mode Temp. Fan
AutoSet temp.
The main display can be displayed in two different modes: "Full" and "Basic".
T
he initial setting is "Full". To switch to the "Basic" mode, change the setting on the Main display setting.
<Full mode> <Basic mode>
All icons are displayed for explanation.
Most settings (except ON / OFF, mode, fan speed, temperature) can be made from the Menu screen.
Indoor unit operation mode appears here.
Operation mode
Preset temperature appears here.
Preset temperature
Current time appears here.
Clock (See the Installation Manual.)
Fan speed
Fan speed setting appears here.
Functions of the corresponding buttons appear here.
Button function guide
Appears when the ON/OFF operation is centrally controlled.
Appears when the operation mode is centrally controlled.
Appears when the preset temperature is centrally controlled.
Appears when the lter reset function is centrally controlled.
Indicates when lter needs maintenance.
Current room temperature appears here.
Room temperature
(See the Installation Manual.)
Appears when the buttons are locked.
Appears when the On/Off timer or Night setback function is
enabled.
Appears when the Weekly timer is enabled.
Appears while the units are operated in the energy-save
mode.
Appears when the built-in thermistor on the remote control-
ler is activated to monitor the room temperature.
appears when the thermistor on the indoor unit is acti-
vated to monitor the room temperature.
Indicates the vane setting.
Indicates the louver setting.
Indicates the ventilation setting.
Appears when the preset temperature range is restricted.
(For PUY application only)
OCH551A

9
Not all functions are available on all models of indoor units.
Filter information
Error information
Energy saving
Auto return
Schedule
Night setback
Main menu Press the MENU button.
Move the cursor to the desired item with the F1 and F2 buttons, and press the SELECT button.
Vane · Louver · Vent. (Lossnay)
High power
Weekly timer
Restriction
Maintenance
Initial setting
On / Off timer
Auto-Off timer
Temp. range
Operation lock
Manual vane angle
Main / Sub
Timer
Main display
Contrast
Display details
Auto mode
Administrator password
Language selection
Service
Service menu
Input maintenance info.
Function setting
Lossnay
Check
Self check
Maintenance password
Remote controller check
Test run
Clock
Drain pump test run
Auto descending panel
Menu structure
OCH551A

10
Setting and display items Setting details
Vane · Louver · Vent.
(Lossnay)
Use to set the vane angle.
• Select a desired vane setting from ve different settings.
Use to turn ON / OFF the louver.
• Select a desired setting from "ON" and "OFF."
Use to set the amount of ventilation.
• Select a desired setting from "Off," "Low," and "High."
High power Use to reach the comfortable room temperature quickly**.
.
• Units can be operated in the High-power mode for up to 30 minutes.
Timer On/Off timer* Use to set the operation On/Off times.
• Time can be set in 5-minute increments.
Auto-Off
timer
Use to set the Auto-Off time.
• Time can be set to a value from 30 to 240 in 10-minute increments.
Filter information Use to check the lter status.
• The lter sign can be reset.
Error information Use to check error information when an error occurs.
• Check code, error source, refrigerant address, unit model, manufacturing number, contact
information (dealer's phone number) can be displayed.
(The unit model, manufacturing number, and contact information need to be registered in
advance to be displayed.)
Weekly timer* Use to set the weekly operation On / Off times.
• Up to eight operation patterns can be set for each day.
(Not valid when the On/Off timer is enabled.)
Energy
saving
Auto return Use to get the units to operate at the preset temperature after performing energy-save
operation for a specied time period.
• Time can be set to a value from 30 and 120 in 10-minute increments.
(This function will not be valid when the preset temperature ranges are restricted.)
Schedule* Set the start/stop times to operate the units in the energy-save mode for each day of
the week, and set the energy-saving rate**.
• Up to four energy-save operation patterns can be set for each day.
• Time can be set in 5-minute increments.
• Energy-saving rate can be set to a value from 0% and 50 to 90% in 10% increments.
Night setback* Use to make Night setback settings.
• Select "Yes" to enable the setting, and "No" to disable the setting. The temperature range
and the start/stop times can be set.
Restriction Temp. range Use to restrict the preset temperature range.
• Different temperature ranges can be set for different operation modes.
Operation
lock
Use to lock selected functions.
• The locked functions cannot be operated.
Maintenance Auto
descending
panel
Auto descending panel (Optional parts) Up / Down you can do**.
Manual
vane angle
Use to set the vane angle for each vane to a xed position**.
Initial setting Main/Sub When connecting two remote controllers, one of them needs to be designated as a sub
controller.
Clock Use to set the current time.
Main display Use to switch between "Full" and "Basic" modes for the Main display.
• The initial setting is "Full."
Contrast Use to adjust screen contrast.
* Clock setting is required.
**The function is not available for SUY model.
Main menu list
OCH551A

11
Setting and display items Setting details
Initial setting Display
details
Make the settings for the remote controller related items as necessary.
Clock: The factory settings are "Yes" and "24h" format.
Temperature: Set either Celsius (°C) or Fahrenheit (°F).
Room temp. : Set Show or Hide.
Auto mode: Set the Auto mode display or Only Auto display.
Auto mode Whether or not to use the AUTO mode can be selected by using the button.
This setting is valid only when indoor units with the AUTO mode function are connected.
Administrator
password
The administrator password is required to make the settings for the following items.
• Timer setting • Energy-save setting • Weekly timer setting
• Restriction setting • Outdoor unit silent mode setting • Night set back
Language
selection
Use to select the desired language.
Service Test run Select "Test run" from the Service menu to bring up the Test run menu.
• Test run • Drain pump test run**
Input
maintenance
Select "Input maintenance Info." from the Service menu to bring up the Maintenance
information screen.
The following settings can be made from the Maintenance Information screen.
• Model name input • Serial No. input • Dealer information input
Function
setting
Make the settings for the indoor unit functions via the remote controller as necessary.
LOSSNAY
setting
(City Multi only)
This setting is required only when the operation of City Multi units is interlocked with
LOSSNAY units.
Check Error history: Display the error history and execute delete error history.
Refrigerant leak check**: Refrigerant leaks can be judged.
Smooth maintenance**: The indoor and outdoor maintenance data can be displayed.
Request cord**: Details of the operation data including each thermistor temperature and error
history can be checked.
Self check Error history of each unit can be checked via the remote controller.
Maintenance
password
Take the following steps to change the maintenance password.
Remote
controller
check
When the remote controller does not work properly, use the remote controller checking
function to troubleshoot the problem.
**The function is not available for SUY model.
OCH551A

12 13
SPECIFICATIONS
4
Cooling
0.05
0.36
Single phase, 50Hz, 220-240V/Single phase, 60Hz, 220V
Munsell 6.4Y 8.9/0.4
Plate fin coil
Turbo fan (direct) o1
0.050
12-13-14-16
0 (direct blow)
–
Remote controller & built-in
28-29-30-32
32
kW
A
kW
K/min
Pa
kW
dB (A)
mm
mm
mm
mm
kg
W
D
H
INDOOR UNIT
PLY-P18BA.TH
Service Ref.
Mode
Power supply (phase, cycle, voltage)
Input
Running current
External finish (Panel)
Heat exchanger
Fan Fan (drive) oNo.
Fan motor output
Airflow (Low-Medium2-Medium1-High)
External static pressure
Booster heater
Operation control & Thermostat
Noise level (Low-Medium2-Medium1-High)
Field drain pipe O.D.
Dimensions
Weight
UNIT : 840 PANEL : 950
UNIT : 840 PANEL : 950
UNIT : 258 PANEL : 35
UNIT : 19 PANEL : 6
INDOOR UNIT
kW
A
kW
K/min
Pa
kW
dB (A)
mm
mm
mm
mm
kg
W
D
H
Service Ref.
Mode
Power supply (phase, cycle, voltage)
Input
Running current
External finish (Panel)
Heat exchanger
Fan Fan (drive) oNo.
Fan motor output
Airflow (Low-Medium2-Medium1-High)
External static pressure
Booster heater
Operation control & Thermostat
Noise level (Low-Medium2-Medium1-High)
Field drain pipe O.D.
Dimensions
Weight
UNIT : 840 PANEL : 950
UNIT : 840 PANEL : 950
UNIT : 258 PANEL : 35
UNIT : 22 PANEL : 6
Cooling
0.07
0.51
Single phase, 50Hz, 220-240V/Single phase, 60Hz, 220V
Munsell 6.4Y 8.9/0.4
Plate fin coil
Turbo fan (direct) o1
0.050
14-16-18-20
0 (direct blow)
–
Remote controller & built-in
28-30-32-34
32
PLY-P24BA.TH
OCH551A

1313
Cooling
0.14
0.94
Single phase, 50Hz, 220-240V/Single phase, 60Hz, 220V
Munsell 6.4Y 8.9/0.4
Plate fin coil
Turbo fan (direct) o1
0.120
20-22-25-28
0 (direct blow)
–
Remote controller & built-in
33-35-38-41
32
kW
A
kW
K/min
Pa
kW
dB (A)
mm
mm
mm
mm
kg
W
D
H
INDOOR UNIT
PLY-P30BA.TH
Service Ref.
Mode
Power supply (phase, cycle, voltage)
Input
Running current
External finish (Panel)
Heat exchanger
Fan Fan (drive) oNo.
Fan motor output
Airflow (Low-Medium2-Medium1-High)
External static pressure
Booster heater
Operation control & Thermostat
Noise level (Low-Medium2-Medium1-High)
Field drain pipe O.D.
Dimensions
Weight
UNIT : 840 PANEL : 950
UNIT : 840 PANEL : 950
UNIT : 298 PANEL : 35
UNIT : 24 PANEL : 6
Cooling
0.16
1.07
Single phase, 50Hz, 220-240V/Single phase, 60Hz, 220V
Munsell 6.4Y 8.9/0.4
Plate fin coil
Turbo fan (direct) o1
0.120
24-26-29-32
0(direct blow)
–
Remote controller & built-in
37-39-41-44
32
kW
A
kW
K/min
Pa
kW
dB (A)
mm
mm
mm
mm
kg
W
D
H
INDOOR UNIT
PLY-P36/42/48BA.TH
Service Ref.
Mode
Power supply (phase, cycle, voltage)
Input
Running current
External finish (Panel)
Heat exchanger
Fan Fan (drive) oNo.
Fan motor output
Airflow (Low-Medium2-Medium1-High)
External static pressure
Booster heater
Operation control & Thermostat
Noise level (Low-Medium2-Medium1-High)
Field drain pipe O.D.
Dimensions
Weight
UNIT : 840 PANEL : 950
UNIT : 840 PANEL : 950
UNIT : 298 PANEL : 35
UNIT : 26 PANEL : 6
OCH551A

14 15
5NOISE CRITERION CURVES
PLY-P18BA.TH NOTCH SPL(dB) LINE
High 32
Medium1 30
Medium2 29
Low 28
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 μbar)
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
BAND CENTER FREQUENCIES, Hz
UNIT
1.5m
MICROPHONE
CEILING
PLY-P24BA.TH NOTCH SPL(dB) LINE
High 34
Medium1 32
Medium2 30
Low 28
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
BAND CENTER FREQUENCIES, Hz
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 μbar)
PLY-P30BA.TH NOTCH SPL(dB) LINE
High 41
Medium1 38
Medium2 35
Low 33
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
PLY-P36BA.TH
PLY-P42BA.TH
PLY-P48BA.TH
NOTCH SPL(dB) LINE
High 44
Medium1 41
Medium2 39
Low 37
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
OCH551A

15
6OUTLINES AND DIMENSIONS
37728460
( )
Ceiling hole
Branch duct hole
Drain pipe
connected to VP-25
Ceiling
Grille
Drain hole
Models
Auto vane
(Air outlet)
Air intake grille
Ceiling
Cut out hole
Cut out hole
Cut out hole
Burring hole pitch
Burring hole pitch
Burring hole
Burring hole
Power supply wire,
Indoor unit/Outdoor unit
connecting wire entry
Indoor unit/Outdoor unit
connecting terminal block
Indoor power supply
terminal block(Option part)
Control wire entry
Air intake hole
Air intake hole
Air outlet hole
Air outlet hole
Connect the attached
drain socket.
Keep approximately
10 to 15mm space
between unit ceiling
and ceiling slab.
Branch duct hole
Fresh air
intake hole
Ceiling hole
Suspension bolt pitch
Suspension bolt pitch
Remote controller
terminal block
Suspension bolt
M10 or W3/8
(7.5)(7.5)
605
+35
-5
620
Receiver
Operation lamp
In case of standard grille : PLP-6BA/PLP-6BAMD
In case of wireless remote controller : PLP-6BALCM
Auto grille
Air intake grille up/down discharge
Emergency operation
switch<Cooling>and
Emergency Up/Down switch<Up>
160
160
500
500
597
83 36
950
8336
950 597
A
17
+5
0
B35
190
156
105
140
50~70
160
840
150
90
C
D
840
187.5
20~45
860~910
20~45
810
20~45
860~910
20~45
24
160
w w
w
w
wwww
w
M
M
M
M
120
120
[175
[125
167
158
Vane motor
2
1
Drain pump clean hole
and Drain emergency
drainage hole
130
100
70
155
350
90 100 100 90
BA C D E
241 258
80 74
400
Unit : mm
298
85 77
440281
2
1
Refrigerant pipe
···[6.35
Flared connection
···1/4 F
Refrigerant pipe
···[9.52
Flared connection
···3/8 F
Refrigerant pipe
···[12.7
Flared connection
···1/2 F
Refrigerant pipe
···[15.88
Flared connection
···5/8 F
PLY-P18BA.TH
PLY-P24BA.TH
PLY-P30BA.TH
PLY-P36BA.TH
Detail drawing of fresh air intake hole
Detail connecting of branch duct(Both aspects)
3-[2.8
14-[2.8
[150
[100
Emergency operation
switch<Fan mode>and
Emergency Up/Down switch<Down>
In case of auto-grille : PLP-6BAJ
Suspension bolt
lower edge
170
w
Corner pocket
PLY-P42BA.TH
PLY-P48BA.TH
Ceiling
Air intake grille
Max. 4.0m
L.L Filter
Ceiling
Grille
Indoor unit
1500mm
or more
1000mm or more
3000mm or more
1800mm or more
from floor
For high
attachment
Indoor unit
Obstacle
Floor
Note 1. Please choose the grille between a standard grille and an auto-grille.
2. As for drain pipe, please use VP-25(O.D. [32 PVC TUBE).
Drain pump is included.
Max. lifting height is 850mm from the ceiling.
3. As for suspension bolt, please use M10 or W3/8.
(Procured at local site)
4. Electrical box may be removed for the service purpose.
Make sure to slack the electrical wire a bit for control/ power wires connection.
5. The height of the indoor unit is able to be adjusted with the grille attached.
6. For the installation of the optional high efficiency filter or optional multi-functional casement.
1) Requires E or more space between transom and ceiling for the installation.
2) Add 135 mm to the dimensions wmarked on the figure.
3) The optional high efficiency filter must be used jointly with the optional multi-functional casement.
7. When installing the branch ducts, be sure to insulate adequately.
Otherwise condensation and dripping may occur.
(It becomes the cause of dew drops/water dew.)
8. As for necessary installation/service space, please refer to the left figure.
PLY-P18BA.TH PLY-P24BA.TH PLY-P30BA.TH
PLY-P36BA.TH PLY-P42BA.TH PLY-P48BA.TH
Unit: mm
OCH551A

16 17
WIRING DIAGRAM
7
SYMBOL SYMBOLNAME NAME
I.B
INDOOR CONTROLLER BOARD
FUSE (T6.3AL250V)
CONNECTOR (LOSSNAY)
CONNECTOR (REMOTE SWITCH)
CONNECTOR (HA TERMINAL-A)
CONNECTOR (CENTRALLY CONTROL)
POWER SUPPLY (I.B)
POWER SUPPLY (R.B)
TRANSMISSION (INDOOR-OUTDOOR)
RELAY (DRAIN PUMP)
SWITCH (MODEL SELECTION)
w See table 1
SWITCH (CAPACITY CODE)
w See table 2
CONNECTOR (EMERGENCY OPERATION)
FAN MOTOR
VANE MOTOR
DRAIN PUMP
DRAIN FLOAT SWITCH
TERMINAL BLOCK (
INDOOR/OUTDOOR CONNECTING LINE )
TERMINAL BLOCK (REMOTE CONTROLLER
TRANSMISSION LINE)
ROOM TEMP. THERMISTOR
(0°C/15kΩ, 25°C/5.4kΩ DETECT)
PIPE TEMP. THERMISTOR/LIQUID
(0°C/15kΩ, 25°C/5.4kΩ DETECT)
COND./EVA. TEMP. THERMISTOR
(0°C/15kΩ, 25°C/5.4kΩ DETECT)
MF
FUSE
MV
DP
CN2L
FS
CN32
CN41
CN51
TB4
LED1
TB5,TB6
LED2
TH1
LED3
X1
TH2
SW1
TH5
SW2
SWE
[LEGEND]
Notes: 1. SymboIs used in wiring diagram above are, :Connector, :Terminal (block).
2. Indoor and outdoor connecting wires are made with poIarities, make wiring matching terminal
numbers (S1, S2, S3).
3. Since the outdoor side electric wiring may change be sure to check the outdoor unit electric wiring for servicing.
4. This diagram shows the wiring of indoor and outdoor connecting wires (specification of 220 - 240V), adopting
superimposed system of power and signal.
[Self-diagnosis]
1.For details on how to operate self-diagnosis with the wireless
remote control,refer to the technical manuals etc.
2.For the wired remote control:When you quickly press twice the CHECK switch on the remote
control, the unit begins self-diagnosis, and Check Codes generated in the past appear on the
display.
For Check Codes and Symptoms refer to the table below.
W.B
RU
BZ
LED1
SW1
SW2
OPTION PART
PCB FOR WIRELESS REMOTE CONTROLLER
RECEIVING UNIT
BUZZER
LED (OPERATION INDICATION : GREEN)
EMERGENCY OPERATION (FAN/DOWN)
EMERGENCY OPERATION (COOL/UP)
w Be sure to turn off the source power and then
disconnect fan motor connector.
(Failure to do so will cause trouble in fan motor)
2 1
1
1 2
3
5 1
4 1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
X1
DP
MF
D.U.M
CNP
(BLU)
FUSE
TB4
YLW
ORN
ORN
BRN
YLW
ORN
OUTDOOR
CN01
(BLK)
INDOOR/OUTDOOR
COMMUNICATION
CN3C
(BLU)
REMOCON
CN22
(BLU)
VANE CNV (WHT)
CN32
(WHT)
CN51 (WHT)
CN41 (WHT)
CN2L
FAN
CNMF
(WHT )
ON
SWE
INTAKE
CN20
(RED)
FLOAT SW
CN4F
(WHT)
LIQUID/PIPE
CN44
(WHT)
Pair No.
J42J41
SW2SW1
Refer to tables 1 and 2
LED3 LED2 LED1
5555
TH5TH2FS TH1
MVMVMVMV
GRILLE
TB5
TRANSMISSION
WIRES
DC12V
2 1
TB6
R.B
I.B
<Table 1> SW1 (MODEL SELECTION)
Manufacture/Service
SW1
ON
OFF
12345
1 6
13 3 15
LED2
LED1
RU
SW2
SW1
CNB
3
9453
CN3G
M
MT
BZ
W.B
U.B
AUTOMATIC FILTER ELEVATION PANEL
(OPTION PART)
I-SEE
SENSOR
CN4Y
(WHT)
I-SEE
SENSOR MOTOR
CN6Y
(RED)
I-SEE SENSOR
CORNER PANEL
(OPTION PART)
I-SEE
SENSOR
WIRELESS
CN90
(WHT)
AUTO GRILLE
CN3G
(BLK)
AUTO
GRILLE
POWER
CNAC
(WHT)
CN3A
1 3 1 53
13
S1
S2
S3
t° t° t°
OFF
1 31 4 1 4 1 2 7 4 1
MS
3~
1 4
1
1 3
9
M M M M
2
1
M
1~
The black square ( )
indicates a switch position.
51
CN105
TO
OUTDOOR
UNIT
<Table 2> SW2 (CAPACITY CODE)
Manufacture/Service
PLY-P18BA
MODELS
SW2
ON
OFF
12345
Manufacture/Service
PLY-P36BA
MODELS
ON
OFF
12345
PLY-P24BA
ON
OFF
12345
The black square ( ) indicates a switch position.
+–
PLY-P30BA
ON
OFF
12345
PLY-P42BA
PLY-P48BA
ON
OFF
12345
ON
OFF
12345
PLY-P18BA.TH PLY-P24BA.TH PLY-P30BA.TH
PLY-P36BA.TH PLY-P42BA.TH PLY-P48BA.TH
OCH551A

17
8REFRIGERANT SYSTEM DIAGRAM
Thermistor TH2
Pipe temperature(Liquid)
Distributor
with strainer (#50)
Thermistor TH5
(Cond./ Eva.temperature)
Thermistor TH1
(Room temperature)
Refrigerant flow in cooling
Strainer (#50)
Strainer (#50)
Heat exchanger
Refrigerant GAS pipe connection
(Flare)
Refrigerant LIQUID pipe connection
(Flare)
PLY-P18BA.TH PLY-P24BA.TH PLY-P30BA.TH
PLY-P36BA.TH PLY-P42BA.TH PLY-P48BA.TH
OCH551A

18 19
9 TROUBLESHOOTING
<Check code display by self-diagnosis and actions to be taken for service (summary)>
Present and past check codes are logged and displayed on the wired remote controller or controller board of outdoor unit.
Actions to be taken for service and the trouble reoccurrence at field are summarized in the table below. Check the contents
below before investigating details.
9-1. TROUBLESHOOTING
Unit conditions at service Check code Actions to be taken for service (summary)
The trouble is reoccurring.
Displayed
Not displayed
Judge what is wrong and take a corrective action
according to “9-3. SELF-DIAGNOSIS ACTION TABLE” .
Identify the cause of the trouble and take a corrective
action according to “9-3. TROUBLESHOOTING OF
PROBLEMS”.
The trouble is not reoccurring.
Logged
Not logged
1Consider the temporary defects such as the work of
protection devices in the refrigerant circuit including
compressor, poor connection of wiring, noise, etc.
Re-check the symptom, and check the installation
environment, refrigerant amount, weather when the
trouble occurred, and wiring related.
2Reset check code logs and restart the unit after finishing
service.
3There is no abnormality in electrical components,
controller boards, and remote controller.
1Recheck the abnormal symptom.
2Identify the cause of the trouble and take a corrective
action according to “9-4. TROUBLESHOOTING OF
PROBLEMS”.
3Continue to operate unit for the time being if the cause
is not ascertained.
4There is no abnormality in electrical components,
controller boards, remote controller, etc.
OCH551A

1919
9-2. MALFUNCTION-DIAGNOSIS METHOD BY REMOTE CONTROLLER
• "CHECK" lights, and refrigerant address
"00" flashes.
• Check that the remote controller's
display has stopped before continuing.
• Select the refrigerant address of the
indoor unit for the self-diagnosis.
Note: Set refrigerant address using the
outdoor unit’s DIP switch (SW1).
(For more information, see the
outdoor unit installation manual.)
• If an air conditioner error occurs, the
indoor unit's sensor emits an intermittent
buzzer sound, the operation light flashes,
and the Check code is output.
(It takes 3 seconds at most for Check
code to appear.)
• The check mode is cancelled.
[Procedure]
1. Press the CHECK button twice.
2. Press the temperature
buttons.
3. Point the remote controller at
the sensor on the indoor unit and
press the HOUR button.
4. Point the remote controller at
the sensor on the indoor unit and
press the ON/OFF button.
Wireless remote controller
<In case of trouble during operation>
When a malfunction occurs to air conditioner, both indoor unit and outdoor unit will stop and operation lamp blinks to inform unusual stop.
ON/OFF TEMP
FAN
VANE
MODE
CHECK
LOUVER
TEST RUN
AUTO STOP
AUTO START
h
min
RESET
SET CLOCK
CHECK
CHECK
display
Temperature
button
CHECK
button
Refrigerant
address
display
HOUR
button
ON/OFF
button
To be continued to the next page.
<Malfunction-diagnosis method at maintenance service>
Wired remote controller
PAR-21MAA
ON/OFF
FILTER
CHECK
OPERATION
CLEAR
TEST
TEMP.
MENU
BACK DAY
MONITOR/SET
CLOCK
ON/OFF
ERROR CODE
ERROR CODE
ERROR CODE
1Turn on the power.
2Press the [CHECK] button twice.
3Set address with [TEMP] button if system control is used.
4Press the [ON/OFF] button to stop the self-check.
ACHECK button
BAddress
CTEMP. button
DIC : Indoor unit
OC: Outdoor unit
ECheck code
FUnit No.
GTimer ON/OFF button
<To cancel check code>
1 Display the check code at the self-check result display screen.
2The address for self-check will blink when the G ON/OFF
button is pressed twice within 3 seconds.
– – – – : No trouble generated in the past
F F F F : No corresponding unit
OCH551A

20
[Output pattern A] Errors detected by indoor unit
[Output pattern B]
E9
OPERATION
INDICATOR
lamp flash
pattern
Beep Beep Beep Beep Beep Beep Beep
Off
Approx. 2.5 sec.
On
Approx. 3 sec.
On
0.5 sec.
On
0.5 sec.
On
0.5 sec.
On
0.5 sec.
Off
Approx. 2.5 sec.
On
Approx. 3 sec.
On
0.5 sec.
On
0.5 sec.
···Repeated
Number of flashes/beeps in pattern indicates the check
code in the following table (i.e., n=5 for “U2”)
Number of flashes/beeps in pattern indicates
the check code in the following table
nth
1st 2nd 3rd 1st 2nd
Self-check
starts
(Start signal
received)
Beeper sounds
[Output pattern B]
OPERATION
INDICATOR
lamp flash
pattern
Beep Beep Beep Beep Beep Beep Beep
Off
Approx. 2.5 sec.
On
0.5 sec.
On
0.5 sec.
On
0.5 sec.
On
0.5 sec.
Off
Approx. 2.5 sec.
On
0.5 sec.
On
0.5 sec.
···Repeated
Number of flashes/beeps in pattern indicates the check
code in the following table (i.e., n=5 for “P5”)
Number of flashes/beeps in pattern indicates
the check code in the following table
nth
1st 2nd 3rd 1st 2nd
Self-check
starts
(Start signal
received)
Beeper sounds
•Refer to the following tables for details on the check codes.
[Output pattern A]
If the beeper does not sound again after the initial 2 beeps to confirm the self-check start signal was received and
the OPERATION INDICATOR lamp does not come on,
there are no error records.
Beeper sounds/OPERATION
INDICATOR lamp flashes 1Check code Symptom Remark
(Number of times)
Wireless remote controller
Wired remote controller
Beeper sounds/OPERATION
INDICATOR lamp flashes 1Check code
(Number of times)
Wireless remote controller
Wired remote controller
1 P1 Intake sensor error
P9 Pipe (TH5) sensor error
2P2 Pipe (TH2) sensor error
3 E6,E7 Indoor/outdoor unit communication error
4 P4 Float switch connector (CN4F) open
5P5
PA
Drain pump error(due to water leakage abnormality)
Forced compressor stop
6 P6 Freezing protection operation
7 EE Communication error between indoor and outdoor units
8 P8 Pipe temperature error
9 E4, E5 Remote controller signal receiving error
10 –
11 –
–
–
Errors detected by unit other than indoor unit (outdoor unit, etc.)
Symptom Remark
1Indoor/outdoor unit communication error
2
(Transmitting error) (Outdoor unit)
3Open/short of outdoor unit thermistors
4Compressor overcurrent interruption (When compressor locked)
5Abnormal high discharging temperature/49C operated/
insufficient refrigerant
6Abnormal high pressure (63H operated)/Overheating
protection operation
7Abnormal temperature of heat sink
8Outdoor unit fan protection stop
9Compressor overcurrent interruption/Abnormal of power module
10 Abnormality of superheat due to low discharge temperature
11 Abnormality such as overvoltage or voltage shortage and
abnormal synchronous signal to main circuit/Current sensor error
12
13
U2
U5
UP
U3,U4
UF
U1,Ud (UD) *3
U8
U6
U7
U9,UH
Others
–
–
–
–
14 Other errors (Refer to the technical manual for the outdoor unit.)
For details, check
the LED display
of the outdoor
controller board.
As for outdoor
unit, refer to
outdoor unit's
service manual.
12
13
Fb (FB)*
PL
Indoor unit control system error (memory error, etc.)
Refrigerant circuit abnormal
–E0, E3
– E1, E2 Remote controller control board error
Remote controller transmission error
Compressor overcurrent interruption
1.
2.
If the beeper sounds 3 times continuously “beep, beep, beep (0.4 + 0.4 + 0.4 sec.)” after the initial 2 beeps to confirm
the self-check start signal was received, the specified refrigerant address is incorrect.
Notes:
•
On wireless remote controller: The continuous buzzer sounds from receiving section of indoor unit. Blink of operation lamp
•
On wired remote controller: 1Check code displayed in the LCD.
*The check code in the parenthesis indicates PAR-31MAA model.
OCH551A