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