Mitsubishi Electric Mr.Slim PLA-A12BA6 User manual

SERVICE MANUAL
CONTENTS
1. REFERENCE MANUAL........................ 2
2. SAFETY PRECAUTION........................ 3
3. PARTS NAMES AND FUNCTIONS...... 5
4. SPECIFICATIONS............................... 11
5. NOISE CRITERION CURVES............. 13
6. OUTLINES AND DIMENSIONS............15
7. WIRING DIAGRAM ............................. 16
8. REFRIGERANT SYSTEM DIAGRAM
...... 17
9. TROUBLESHOOTING ........................ 18
10. SPECIAL FUNCTION ......................... 32
11. DISASSEMBLY PROCEDURE ........... 35
Notes:
• This manual describes service
data of the indoor units only.
• RoHS compliant products have
<G> mark on the spec name
plate.
PARTS CATALOG (OCB581)
WIRED REMOTE
CONTROLLER
(Option)
IR WIRELESS REMOTE
CONTROLLER
(Option)
ON/OFF TEMP
INDOOR UNIT
Model name
indication
PLA-A12BA6
PLA-A18BA6
PLA-A24BA6
PLA-A30BA6
PLA-A36BA6
PLA-A42BA6
PLA-A12BA6
PLA-A18BA6
PLA-A24BA6
PLA-A30BA6
PLA-A36BA6
PLA-A42BA6
Indoor unit
[Model Name] [Service Ref.]
December 2014
No. OCH581
SPLIT-SYSTEM HEAT PUMP
MITSUBISHI
ELECTRIC
I Series PL AI Ceiling Cassettes I 841 DA I
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2
1REFERENCE MANUAL
OUTDOOR UNIT SERVICE MANUAL
Model Name Service Ref. Service Manual No.
PUZ-A18/24/30/36/42NHA6
PUZ-A18/24/30/36/42NHA6-BS
PUZ-A18/24/30/36/42NHA6
PUZ-A18/24/30/36/42NHA6-BS OCH577
OCB577
PUY-A12/18/24/30/36/42NHA6
PUY-A12/18/24/30/36/42NHA6-BS
PUY-A12/18/24/30/36/42NHA6
PUY-A12/18/24/30/36/42NHA6-BS
PUZ-HA30/36NHA2 PUZ-HA30/36NHA2 OCH426/OCB426
PUZ-HA42NKA PUZ-HA42NKA OCH567/OCB567
MXZ-3C24/30NA
MXZ-3C24/30NAHZ
MXZ-3C24/30NA
MXZ-3C24/30NAHZ OBH702/OBB702
MXZ-4C36NA
MXZ-5C42NA
MXZ-8C48NA
MXZ-4C36NA
MXZ-5C42NA
MXZ-8C48NA OCH573
OCB573
MXZ-4C36NAHZ
MXZ-5C42NAHZ
MXZ-8C48NAHZ
MXZ-4C36NAHZ
MXZ-5C42NAHZ
MXZ-8C48NAHZ
Radio frequency interface Wired remote controller IR wireless remote controller
ON/OFF
TEMP.
COOL
DRY
AUTO
FAN
HEAT
RF thermostat
Remote controller (Optional parts)
OCH581
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SAFETY PRECAUTION
2
Cautions for units utilising refrigerant R410A
2-2. CAUTIONS RELATED TO NEW REFRIGERANT
Use new refrigerant 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.
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 large amount of mineral oil enters, that can cause deterio-
ration of refrigerant oil, etc.
The refrigerant oil applied to flare and flange
connections must be ester oil, ether oil or
alkylbenzene oil in a small amount.
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 hazards to refrigerant cycle.
In addition, use pipes with specified thickness.
Store the piping indoors, and both ends of the
piping sealed until just before brazing.
(Leave elbow joints, etc. in their packaging.)
If dirt, dust or moisture enters into refrigerant cycle, that can
cause deterioration of refrigerant oil or malfunction of compressor.
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.
Ventilate the room if refrigerant leaks during
operation. If refrigerant comes into contact with
a flame, poisonous gases will be released.
Use the specified refrigerant only.
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.
2-1. ALWAYS OBSERVE FOR SAFETY
Before obtaining access to terminal, all supply
circuits must be disconnected.
OCH581
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Gravimeter
Unit
[3] Service tools
Use the below service tools as exclusive tools for R410A refrigerant.
[2] Additional refrigerant charge
When charging directly from cylinder
· Check that cylinder for R410A on the market is a syphon type.
· Charging should be performed with the cylinder of syphon stood vertically. (Refrigerant is charged from liquid phase.)
[1] Cautions for service
(1) Perform service after recovering the refrigerant left in the 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.
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 —
OCH581

5
3PARTS NAMES AND FUNCTIONS
Drain pipe
Filter
Vane
Gas pipe
Liquid pipe
Air outlet
i-see sensor
(option)
Air intake
(Intake grille)
OCH581
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Wired remote controller (Option)
Function buttons
4 3 2 1
5
6
7 8 9 0
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.
Fri
Room
Set temp.
Mode Temp. Fan
Cool
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
▌1[ON/OFF] button
Press to turn ON/OFF the indoor unit.
▌2[SELECT] button
Press to save the setting.
▌3[RETURN] button
Press to return to the previous screen.
▌4[MENU] button
Press to bring up the Main menu.
▌5Backlit LCD
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.
When the backlight is off, pressing any button turns the backlight on
and does not perform its function. (except for the [ON/OFF] button)
▌6ON/OFF lamp
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.
▌7Function button [F1]
Main display: Press to change the operation mode.
Main menu: Press to move the cursor down.
▌8Function button [F2]
Main display: Press to decrease temperature.
Main menu: Press to move the cursor up.
▌9Function button [F3]
Main display: Press to increase temperature.
Main menu: Press to go to the previous page.
▌0Function button [F4]
Main display: Press to change the fan speed.
Main menu: Press to go to the next page.
Controller interface
7 8 9 07 8 9 0
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The main display can be displayed in two different modes: “Full” and “Basic”. The initial setting is “Full”. To switch to the “Basic” mode, change the
setting on the Main display setting. (Refer to operation manual included with remote controller.)
<Basic mode>
▌3
Appears when the On/Off timer, Night setback, or Auto-off timer func-
tion is enabled.
appears when the timer is disabled by the centralized control
system.
▌4
Appears when the Weekly timer is enabled.
▌5
Appears while the units are operated in the energy-save mode. (Will
not appear on some models of indoor units)
▌6
Appears while the outdoor units are operated in the silent mode.
▌7
Appears when the built-in thermistor on the remote controller is acti-
vated to monitor the room temperature (1).
appears when the thermistor on the indoor unit is activated to
monitor the room temperature.
▌8
Indicates the vane setting.
▌9
Indicates the louver setting.
▌)
Indicates the ventilation setting.
▌!
Appears when the preset temperature range is restricted.
▌1Operation mode
Indoor unit operation mode appears here.
▌2Preset temperature
Preset temperature appears here.
▌3Clock (See the Installation Manual.)
Current time appears here.
▌4Fan speed
Fan speed setting appears here.
▌5Button function guide
Functions of the corresponding buttons appear here.
▌6
Appears when the ON/OFF operation is centrally controlled.
▌7
Appears when the operation mode is centrally controlled.
▌8
Appears when the preset temperature is centrally controlled.
▌9
▌0
▌1Room temperature (See the Installation Manual.)
Current room temperature appears here.
▌2
Appears when the buttons are locked.
<Full mode>
* All icons are displayed for explanation.
Fri
Mode Temp. Fan
Room
Cool Set temp.
Fri
Cool
Mode Temp. Fan
Set temp.
4
3
2
1
5
6
7
8
90
1
3
9
4
)
!
2 3 4 5 6 7 8 2
1
5
Most settings (except ON/OFF, mode, fan speed, temperature) can be made from the Menu screen.
(Refer to operation manual included with remote controller.)
Display
Appears
OCH581
Appears when the filter reset function is centrally controlled.
II
when filter needs maintenance.
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Not all functions are available on all models of indoor units.
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
Input maintenance info.
Function setting
Lossnay (City Multi only)
Check
Self check
Maintenance password
Remote controller check
Test run
Clock
Auto descending panel
Menu structure
Filter Information
Error Information
OCH581
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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.
Weekly timer* Use to set the weekly operation On / Off times.
• Up to 8 operation patterns can be set for each day. (Not valid when the On/Off timer is enabled.)
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.
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 4 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% or 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.
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.)
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.
Display details Make the settings for the remote controller related items as necessary.
Clock: The initial 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.
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 code: 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 Use to change the maintenance password.
Remote controller check When the remote controller does not work properly, use the remote controller checking function to trou-
blushoot the problem.
Main menu list
* Clock setting is required.
** The function is not available for MXZ model.
OCH581

10
IR wireless remote controller (Option)
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, heating, auto and fan mode.
CHECK-TEST RUN buttons
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.
buttons
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.
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.
TIMER CONTROL buttons
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Service Ref.
Power supply (phase, cycle, voltage)
Max. Fuse Size
Min. Circuit Ampacity
External finish (Panel)
Heat exchanger
Fan Fan (drive)
o No.
Fan motor output
Fan motor
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
Single phase,60 Hz, 208/230 V
15
1
Munsell 6.4Y 8.9/0.4
Plate fin coil
Turbo fan (direct) o1
0.05
0.51
Dry: 12-14-16-18(420-490-570-640)
Wet:11-13-15-17(390-460-530-600)
0(direct blow)
–
Remote controller & built-in
28-29-31-32
32 (1-1/4)
PLA-A18BA6
UNIT : 840 (33-1/16) PANEL : 950 (37-3/8)
UNIT : 840 (33-1/16) PANEL : 950 (37-3/8)
UNIT : 258 (10-3/16) PANEL : 35 (1-3/8)
UNIT : 22 (49) PANEL: 6 (13)
A
A
kW
F.L.A.
K/min(CFM)
Pa(mmAq)
kW
dB
mm (in)
mm (in)
mm (in)
mm (in)
kg (lb)
W
D
H
INDOOR UNIT
Single phase,60 Hz, 208/230 V
15
1
Munsell 6.4Y 8.9/0.4
Plate fin coil
Turbo fan (direct) o1
0.05
0.51
Dry: 11-12-13-15(390-420-460-530)
Wet: 10-11-12-14(350-390-420-490)
0(direct blow)
–
Remote controller & built-in
27-28-29-31
32 (1-1/4)
A
A
kW
F.L.A.
K/min(CFM)
Pa(mmAq)
kW
dB
mm (in)
mm (in)
mm (in)
mm (in)
kg (lb)
Service Ref.
Power supply (phase, cycle, voltage)
Max. Fuse Size
Min. Circuit Ampacity
External finish (Panel)
Heat exchanger
Fan Fan (drive)
o No.
Fan motor output
Fan motor
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
W
D
H
INDOOR UNIT
PLA-A12BA6
UNIT : 840 (33-1/16) PANEL : 950 (37-3/8)
UNIT : 840 (33-1/16) PANEL : 950 (37-3/8)
UNIT : 258 (10-3/16) PANEL : 35 (1-3/8)
UNIT : 22 (49) PANEL: 6 (13)
SPECIFICATIONS
4
PLA-A24BA6
UNIT : 840 (33-1/16) PANEL : 950 (37-3/8)
UNIT : 840 (33-1/16) PANEL : 950 (37-3/8)
UNIT : 258 (10-3/16) PANEL : 35 (1-3/8)
UNIT : 23 (51) PANEL: 6 (13)
Single phase,60 Hz, 208/230 V
15
1
Munsell 6.4Y 8.9/0.4
Plate fin coil
Turbo fan (direct) o1
0.05
0.51
Dry: 12-14-16-18(420-490-570-640)
Wet: 11-13-15-17(390-460-530-600)
0(direct blow)
–
Remote controller & built-in
28-29-31-32
32(1-1/4)
A
A
kW
F.L.A.
K/min(CFM)
Pa(mmAq)
kW
dB
mm (in)
mm (in)
mm (in)
mm (in)
kg (lb)
W
D
H
INDOOR UNIT
Service Ref.
Power supply (phase, cycle, voltage)
Max. Fuse Size
Min. Circuit Ampacity
External finish (Panel)
Heat exchanger
Fan Fan (drive)
o No.
Fan motor output
Fan motor
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
OCH581
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UNIT : 840 (33-1/16) PANEL : 950 (37-3/8)
UNIT : 840 (33-1/16) PANEL : 950 (37-3/8)
UNIT : 298 (11-3/4) PANEL : 35 (1-3/8)
UNIT : 25 (55) PANEL : 6 (13)
PLA-A36BA6
Single phase, 60 Hz, 208/230 V
15
2
Munsell 6.4Y 8.9/0.4
Plate fin coil
Turbo fan (direct) o1
0.12
1.00
Dry: 20-23-26-30(710-810-920-1060)
Wet: 19-22-25-29(670-770-880-1030)
0(direct blow)
–
Remote controller & built-in
32-34-37-40
32(1-4)
A
A
kW
F.L.A.
K/min(CFM)
Pa(mmAq)
kW
dB
mm (in)
mm (in)
mm (in)
mm (in)
kg (lb)
Service Ref.
Power supply (phase, cycle, voltage)
Max. Fuse Size
Min. Circuit Ampacity
External finish (Panel)
Heat exchanger
Fan Fan (drive)
o No.
Fan motor output
Fan motor
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
W
D
H
INDOOR UNIT
Service Ref.
Power supply (phase, cycle, voltage)
Max. Fuse Size
Min. Circuit Ampacity
External finish (Panel)
Heat exchanger
Fan Fan (drive)
o No.
Fan motor output
Fan motor
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
PLA-A30BA6
UNIT : 840 (33-1/16) PANEL : 950 (37-3/8)
UNIT : 840 (33-1/16) PANEL : 950 (37-3/8)
UNIT : 258 (10-3/16) PANEL : 35 (1-3/8)
UNIT : 23 (51) PANEL: 6 (13)
Single phase, 60 Hz, 208/230 V
15
1
Munsell 6.4Y 8.9/0.4
Plate fin coil
Turbo fan (direct) o1
0.05
0.51
Dry: 14-16-18-21(490-570-640-740)
Wet: 13-15-17-20(460-530-600-710)
0(direct blow)
–
Remote controller & built-in
28-30-32-34
32(1-1/4)
A
A
kW
F.L.A.
K/min(CFM)
Pa(mmAq)
kW
dB
mm (in)
mm (in)
mm (in)
mm (in)
kg (lb)
W
D
H
INDOOR UNIT
UNIT : 840 (33-1/16) PANEL : 950 (37-3/8)
UNIT : 840 (33-1/16) PANEL : 950 (37-3/8)
UNIT : 298 (11-3/4) PANEL : 35 (1-3/8)
UNIT : 25 (55) PANEL : 6 (13)
PLA-A42BA6
Single phase, 60 Hz, 208/230 V
15
2
Munsell 6.4Y 8.9/0.4
Plate fin coil
Turbo fan (direct) o1
0.12
1.00
Dry: 22-25-28-31(780-880-990-1090)
Wet: 21-24-27-30(740-850-950-1060)
0(direct blow)
–
Remote controller & built-in
34-36-39-41
32(1-1/4)
A
A
kW
F.L.A.
K/min(CFM)
Pa(mmAq)
kW
dB
mm (in)
mm (in)
mm (in)
mm (in)
kg (lb)
W
D
H
INDOOR UNIT
Service Ref.
Power supply (phase, cycle, voltage)
Max. Fuse Size
Min. Circuit Ampacity
External finish (Panel)
Heat exchanger
Fan Fan (drive) oNo.
Fan motor output
Fan motor
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
OCH581
I
I
I
I
I
I
I
I
I

13
5NOISE CRITERION CURVES
PLA-A12BA6 PLA-A18BA6
NOTCH SPL(dB) LINE
High 31
Medium1 29
Medium2 28
Low 27
NOTCH SPL(dB) LINE
High 32
Medium1 31
Medium2 29
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
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 bar) OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 bar)
BAND CENTER FREQUENCIES, Hz
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
PLA-A24BA6 PLA-A30BA6
NOTCH SPL(dB) LINE
High 32
Medium1 31
Medium2 29
Low 28
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
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 bar) OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 bar)
OCH581
□
0---0 0---0
- -
--
- -
0---0 0---0
- -
- -
- -

14
PLA-A36BA6 PLA-A42BA6
NOTCH SPL(dB) LINE
High 40
Medium1 37
Medium2 34
Low 32
NOTCH SPL(dB) LINE
High 41
Medium1 39
Medium2 36
Low 34
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
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 bar) OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 bar)
UNIT
5ft
MICROPHONE
CEILING
OCH581
0---0 0---0
- -
- -
- -

15
INDOOR UNIT
PLA-A12BA6 PLA-A18BA6 PLA-A24BA6
PLA-A30BA6 PLA-A36BA6 PLA-A42BA6
6OUTLINES AND DIMENSIONS
Unit: in (mm)
14-27/3211-3/16
2-3/8
+5 0
(7.5)
+35 -5
(160)
(500)
(950)
Floor
Min.94-1/2(2400)
from floor
Entire
periphery
(36)
(83)
(83)
(36)
(500)
(950)
(597)
(597)
( 158)
( [ 175)
(350)
(
[ 150)
( 14- [ 2.8 )
(167)
(155)
(130)
(100)
(90) (90)
(100) (100)
(35)
(17 )
+3/16
0
(190)
(156)
(105)
(50~70)
(140)
(170)
(377)
(284)
(60)
(24)
(187.5)
(840)
(160)
(160)
(20~45)
to 1-25/32
(860~910)
(620)
(605 )
-3/16 +1-3/8
(90)
(150)
(160)
(7.5)
(20~45)
1-25/32
Corner pocket
In case of IR wireless remote controller
In case of standard grille
Note1. As for drain pipe, please use VP-25(O.D. [ 1-1/4( [ 32) PVC TUBE).
Drain pump is included.
Max. liftng height is 70-7/18(850mm) from the ceiling.
2. As for suspension bolt, please use M10 or W3/8.(Procured at local site)
3. Electrical box may be removed for the service purpose.
Make sure to slack the electrical wire little bit for control/power wires connection.
4. The height of the indoor unit is able to be adjusted with the grille attached.
5. For the installation of the optional high efficiency filter or optional multi-functional casement.
1) Add 5-5/16(135mm) to the dimensions
w
marked on the figure.
2) The optional high efficiency filter must be used jointly with the multi-functional casement.
6. 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.)
7. As for necessary installation/service space, please refer to the left figure.
Drain hole
Drain pump clean hole
and Drain emergency
drainage hole
For MA-Remote controller
terminal block
Emergency operation switch<Cooling>
Emergency operation switch<Heating>
Indoor unit
Ceiling
Cut out hole
Burring hole pitch
3- [ 1/8(3- [ 2.8)
Burring hole
Detail drawing of fresh air intake hole
Burring hole
14- [ 1/8
Cut out hole
Burring hole pitch
Cut out hole
Detail connecting of Branch duct(Both aspects)
(77)
3-1/32
(85)
3-11/32
(298)
11-3/4
11-1/16
(281)
(74)(80)(258)(241)
2-29/32
3-5/32
10-3/16
PLA-A36BA6
PLA-A42BA6
PLA-A24BA6
PLA-A30BA6
9-1/2
DCBA
2
Refrigerant pipe
····
[ 15.88
Flared connection
····5/8 inch
Refrigerant pipe
····
[ 12.7
Flared connection
····1/2 inch
1
Refrigerant pipe
····
[ 6.35
Flared connection
····1/4 inch
Refrigerant pipe
····
[ 9.52
Flared connection
····3/8 inch
Models
PLA-A12BA6
PLA-A18BA6
Min.19-11/16(500)
Grille
Ceiling
Suspension bolt
lower edge
Vane motor
Air intake grille
Air outlet hole
Air outlet hole
Auto vane
(Air outlet)
Air intake hole
Air intake hole
Grille
Ceiling
Keep 25/64(10) to 19/32(15)
between unit ceiling
and ceiling slab.
)(
Connected the attached
flexible pipe or socket.
Drain pipe
connected to VP-25
Suspension bolt
M10 or W3/8
Branch duct hole
Fresh air
intake hole
Branch duct hole
Ceiling hole
Suspension bolt pitch
Suspension bolt pitch
Ceiling hole
(5/16)(5/16)
23-13/16
24-13/32
DEFROST/STAND BY lamp
Receiver
Operation lamp
For wiring replacement kit
terminal block
6-5/16
6-5/16
1
2
3-15/16
5-1/8
13-25/32
3-17/32
3-15/16 3-15/16
3-17/32
70˚
6-9/16 6-3/32
[ 5-29/32
[ 6-7/8
19-11/16
19-11/16
23-1/2
M
M
M
M
3-17/64
1-27/64
37-3/8
3-17/64
1-27/64
37-3/8 23-1/2
1-15/16~2-3/4
5-1/2
6-11/16
1-3/8
11/16
4-1/8
6-9/64
7-15/32
A
B
6-5/16
33-1/16(840)
5-29/32
3-17/32
C
D
33-1/16
7-3/8
25/32 to 1-25/32(20~45) 25/32 to 1-25/32(20~45)
33-27/32 to 35-13/16(860~910)
31-7/8(810)
25/32 to
33-27/32 to 35-13/1625/32
15/16
6-5/16
Indoor unit/Outdoor unit
connecting terminal block
[ 4-29/32( [ 125)
[ 3-15/16( [ 100)
6-7/32
120°
120°
ww
w
w w
w
w
w
w
w
OCH581
□
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--- r---i--------
• r-:
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.... ELECTRIC
0 0

16
7WIRING DIAGRAM
INDOOR UNIT
PLA-A12BA6 PLA-A18BA6 PLA-A24BA6
PLA-A30BA6 PLA-A36BA6 PLA-A42BA6
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.
1.Use copper supply wires.
Utilisez des fils d,alimentation en cuivre.
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) See table 1
SWITCH (CAPACITY CODE) See table 2
CONNECTOR (EMERGENCY OPERATION)
FAN MOTOR
VANE MOTOR
DRAIN-UP MACHINE
DRAIN FLOAT SWITCH
TERMINAL BLOCK (
INDOOR/OUTDOOR CONNECTING LINE )
TERMINAL BLOCK (REMOTE CONTROLLER
TRANSMISSION LINE)
MF
FUSE
MV
DP
CN2L
FS
CN32
CN41
CN51
TB4
LED1
TB5,TB6
LED2
TH1
LED3
X1
TH2
SW1
TH5
TB6
SW2
SWE
[LEGEND]
W.B
RU
BZ
LED1
LED2
SW1
SW2
OPTION PART
PCB FOR IR WIRELESS REMOTE CONTROLLER
RECEIVING UNIT
BUZZER
LED (OPERATION INDICATION : GREEN)
LED (PREPARATION FOR HEATING : ORANGE)
EMERGENCY OPERATION (HEAT / DOWN)
EMERGENCY OPERATION (COOL / UP)
CN24 CONNECTOR<BACK-UP HEATING>
CN30 CONNECTOR<LLC>
ROOM TEMP. THERMISTOR
(32˚F / 15kΩ, 77˚F / 5.4kΩ DETECT)
PIPE TEMP. THERMISTOR/LIQUID
(32˚F / 15kΩ, 77˚F / 5.4kΩ DETECT)
COND. / EVA. TEMP. THERMISTOR
(32˚F / 15kΩ, 77˚F / 5.4kΩ DETECT)
RFI
RADIO FREQUENCY INTERFACE FOR RF THERMOSTAT
CN105 CONNECTOR (RADIO FREQUENCY INTERFACE)
R.B WIRED REMOTE CONTROLLER BOARD
TERMINAL BLOCK (REMOTE CONTROLLER
TRANSMISSION LINE)
<Table 2>SW2(CAPACITY CODE)
Service
PLA-A30BA6
PLA-A36BA6
PLA-A42BA6
PLA-A12BA6
PLA-A18BA6
PLA-A24BA6
MODELS
SW2
ON
OFF
12345
Service MODELS
ON
OFF
12345
ON
OFF
12345
ON
OFF
12345
ON
OFF
12345
ON
OFF
12345
<Table 1>SW1(MODEL SELECTION)
Service
SW1
ON
OFF
12345
The black square (■ )indicates a switch position.
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
1
2
2
1 3
1 3 5
3
5 1
711 21 41 4 4 3 1
4 1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
DC280V
X1
DP
M
1~
D.U.M
CNP
(BLU)
FUSE
YLW
ORN
ORN
BRN
YLW
ORN
OUTDOOR
CN01
(BLK)
INDOOR/OUTDOOR
COMMUNICATION
CN3C
(BLU)
REMOCON
CN22
(BLU)
RECTIFICATION
VANE CNV (WHT)
CN32
(WHT)
CN51 (WHT) CN24 (YLW)
CN41 (WHT)
CN2L
FAN
CNMF
(WHT )
ON OFF
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 TH5TH2
FS TH1
t°
MMMM
MVMVMVMV
GRILLE
TB5
TRANSMISSION
WIRES
DC12V
TO
OUTDOOR
UNIT
2 1
TB6
R.B
I.B
1614191 3
LED2
LED1
RU
SW2
SW1
CNB
945
M
MT
BZ
W.B
I-SEE
SENSOR
CN4Y
(WHT)
I-SEE
SENSOR MOTOR
CN6Y
(RED)
I-SEE SENSOR
CORNER PANEL
(OPTION PART)
I-SEE
SENSOR
WIRELESS
CN90
(WHT)
CN3G
(BLK)
CNAC
(WHT)
1 3
CN30
(GRN)
MF
MS
3~
t°t°
1 3
2
1
S1
S2
S3
TB4
2
CN105
(RED)
1 5
5
RFI
OCH581
□~--------~
i, ________ ;
[QI ® !
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·~-------------/i ~-_,!
_______ )
~ ITIJ

17
Thermistor TH2
Pipe temperature (Liquid)
Distributor
with strainer (#50)
Thermistor TH5
(Cond./ Eva. temperature)
Thermistor TH1
(Room temperature)
Refrigerant flow in cooling
Refrigerant flow in heating
Strainer (#50)
Strainer (#50)
Heat exchanger
Refrigerant GAS pipe connection
(Flare)
Refrigerant LIQUID pipe connection
(Flare)
8REFRIGERANT SYSTEM DIAGRAM
PLA-A12BA6 PLA-A18BA6 PLA-A24BA6
PLA-A30BA6 PLA-A36BA6 PLA-A42BA6
OCH581
DL_ ________ ~

18
9 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”.
Conduct troubleshooting and ascertain the cause of the
trouble according to “9-4. TROUBLESHOOTING BY
INFERIOR PHENOMENA”.
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, matters related to wiring, etc.
2
Reset check code logs and restart the unit after finishing
service.
3There is no abnormality in electrical component,
controller board,remote controller, etc.
1Re-check the abnormal symptom.
2Conduct troubleshooting and ascertain the cause of the
trouble according to “9-4. TROUBLESHOOTING BY
INFERIOR PHENOMENA”.
3Continue to operate unit for the time being if the cause
is not ascertained.
4There is no abnormality concerning of parts such as
electrical component, controller board, remote controller,
etc.
<Check code displayed by self-diagnosis and actions to be taken for service (summary)>
Present and past check codes are logged, and they can be displayed on the wired remote controller and control board of out-
doorunit. Actions to be taken for service, which depends on whether or not the trouble is reoccurring in the field, are summa-
rized in the table below. Check the contents below before investigating details.
9-1. TROUBLESHOOTING
OCH581
□~-------

19
[Procedure]
1. Press the CHECK button twice.
2. Press the TEMP 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.
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>
9-2. MALFUNCTION-DIAGNOSIS METHOD BY 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.
• "CHECK" lights, and refrigerant
address "00" blinks.
• 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 intermit-
tent buzzer sound, the operation lamp
blinks, and the check code is
output.
(It takes 3 seconds at most for check
code to appear.)
• The check mode is cancelled.
■IR wireless remote controller
OCH581
D
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UL/
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61-◊ OD le:J+OI
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1~1
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0 0
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20
[Output pattern A] Errors detected by indoor unit
[Output pattern B]
E9
1. 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.
2. If the beeper sounds 3 times continuously “beep, beep, beep (0.4 + 0.4 + 0.4 seconds)” after the initial 2 beeps to confirm
the self-check start signal was received, the specified refrigerant address is incorrect.
OPERATION
INDICATOR
lamp blink
pattern
peeBpeeBpeeBpeeBpeeB Beep Beep
Off
Approx. 2.5 s
On
Approx. 3 s
On
0.5 s
On
0.5 s
On
0.5 s
On
0.5 s
Off
Approx. 2.5 s
On
Approx. 3 s
On
0.5 s
On
0.5 s
· · · Repeated
Number of blinks/beeps in pattern indicates the check
code in the following table (i.e., n=5 for “U2”)
Number of blinks/beeps in pattern indicates
the check code in the following table
n
th
1
st
2
nd
3
rd
1
st
2
nd
Self-check
starts
(Start signal
received)
Beeper sounds
[Output pattern B]
OPERATION
INDICATOR
lamp blink
pattern
Beep Beep Beep Beep Beep Beep Beep
Off
Approx. 2.5 s
On
0.5 s
On
0.5 s
On
0.5 s
On
0.5 s
Off
Approx. 2.5 s
On
0.5 s
On
0.5 s
· · · Repeated
Number of blinks/beeps in pattern indicates the check
code in the following table (i.e., n=5 for “P5”)
Number of blinks/beeps in pattern indicates
the check code in the following table
n
th
1
st
2
nd
3
rd
1
st
2
nd
Self-check
starts
(Start signal
received)
Beeper sounds
•Refer to the following tables for details on the check codes.
[Output pattern A]
Notes:
Beeper sounds/OPERATION
INDICATOR lamp blinks 1Check code Symptom Remark
(Number of times)
IR wireless remote controller
Wired remote controller
Beeper sounds/OPERATION
INDICATOR lamp blinks 1Check code
(Number of times)
IR 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 open
5P5
PA
Drain pump error
Forced compressor stop(due to water leakage abnormality)
6 P6 Freezing/Overheating 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 heatsink
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
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 Fb Indoor unit control system error (memory error, etc.)
– E0, E3
– E1, E2 Remote controller control board error
Remote controller transmission error
Compressor overcurrent interruption
14 PL Abnormality of refrigerant circuit
OCH581
____J[Jl___- -- -~ µL _ -- ______n_r
-
'--------y--
_JlJL_ _ -- _ ____J -- - -~ µL- _-- _ ____J- - -- - -----u7__J
+-+ +-----H--------+