Mitsubishi Electric Mr. Slim PLA-A12EA7 User manual

SERVICE MANUAL
CONTENTS
1. REFERENCE MANUAL........................ 2
2. SAFETY PRECAUTION........................ 3
3. PARTS NAMES AND FUNCTIONS...... 5
4. SPECIFICATIONS............................... 13
5. NOISE CRITERION CURVES............. 15
6. OUTLINES AND DIMENSIONS............17
7. WIRING DIAGRAM ............................. 18
8. REFRIGERANT SYSTEM DIAGRAM
...... 19
9. TROUBLESHOOTING ........................ 20
10. FUNCTION SETTING ......................... 34
11. SPECIAL FUNCTION.......................... 35
12. DISASSEMBLY PROCEDURE........... 39
PARTS CATALOG (OCB640)
WIRED REMOTE
CONTROLLER
(Option)
IR WIRELESS REMOTE
CONTROLLER
(Option)
ON/OFF TEMP
INDOOR UNIT
Model name
indication for
MAIN UNIT
Model name
indication for GRILLE
PLA-A12EA7
PLA-A18EA7
PLA-A24EA7
PLA-A30EA7
PLA-A36EA7
PLA-A42EA7
PLA-A12EA7
PLA-A18EA7
PLA-A24EA7
PLA-A30EA7
PLA-A36EA7
PLA-A42EA7
Indoor unit
[Model Name] [Service Ref.]
SPLIT-SYSTEM HEAT PUMP
No. OCH640
REVISED EDITION-D
December 2019
Revision:
• Some descriptions have
been modified
in REVISED EDITION-D.
OCH640 REVISED EDITION-C
is void.
MENU ON
OFF
RETURN SELECT
HOLD
Grille model
[Model Name]
PLP-40EAEU
PLP-41EAEU

2 3
OCH640D
1REFERENCE MANUAL
OUTDOOR UNIT SERVICE MANUAL
Model Name Service Ref. Service Manual No.
MXZ-2B20NA
MXZ-3C24/30NA2, MXZ-4C36NA2
MXZ-2B20NA-2
MXZ-3C24/30NA2-U1, MXZ-4C36NA2-U1
OBH560
OBB560
MXZ-2C20NAHZ2, MXZ-2C24NAHZ2
MXZ-2C30NAHZ2, MXZ-5C42NA2
MXZ-2C20NAHZ2-U1, MXZ-2C24NAHZ2-U1
MXZ-2C30NAHZ2-U1, MXZ-5C42NA2-U1
OBH702
OBB702
MXZ-4C36NAHZ, MXZ-5C42NAHZ
MXZ-8C48NAHZ, MXZ-8C48NA
MXZ-8C60NA
MXZ-4C36NAHZ, MXZ-5C42NAHZ
MXZ-8C48NAHZ, MXZ-8C48NA
MXZ-8C60NA
OCH573
OCB573
PUZ-A12/18/36/42NKA7(-BS)
PUZ-A24/30NHA7(-BS)
PUY-A12/18/36/42NKA7(-BS)
PUY-A24/30NHA7(-BS)
PUZ-A12/18/36/42NKA7(-BS)
PUZ-A24/30NHA7(-BS)
PUY-A12/18/36/42NKA7(-BS)
PUY-A24/30NHA7(-BS)
OCH636
OCB636
Remote controller (Optional parts)
Wired remote controller IR wireless remote controller
COOL
DRY
AUTO
FAN
HEAT
MENU ON
OFF
RETURN SELECT
HOLD

3
OCH640D
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 keep 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.

5
OCH640D 4
Electronic weighing scale
Unit
[3] Service tools
Use the below service tools as exclusive tools for R410A refrigerant.
[2] Additional refrigerant charge
When charging directly from cylinder
(1) Check that cylinder for R410A on the market is a syphon type.
(2) 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 768.7 PSIG [5.3MPa·G] or over.
2Charge hose · Only for R410A
· Use pressure performance of 738.2 PSIG [5.09MPa·G] or over.
3Electronic weighing 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 —

5
OCH640D
3PARTS NAMES AND FUNCTIONS
Drain pipe
Air outlet
Liquid pipe
Gas pipe
i-See sensor
(option)
Vane
Air intake
(Intake grille)
Filter
3-1. INDOOR UNIT

6 7
OCH640D
3-2. Wired Remote Controller <PAR-40MAA>
Function buttons
MENU
ON
OFF
RETURN SELECT
HOLD
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 turn ON/OFF the indoor unit.
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.
1[ON/OFF] button 6ON/OFF lamp
Press to save the setting.
When the Main menu is displayed, pressing this button will
enable/disable the HOLD function.
Main display: Press to change the operation mode.
Menu screen: The button function varies with the screen.
2 [SELECT/HOLD] button
7 Function button [F1]
Press to return to the previous screen. Main display: Press to decrease temperature.
Main menu: Press to move the cursor left.
Menu screen: The button function varies with the screen.
3[RETURN] button 8Function button [F2]
4[MENU] button
9Function button [F3]
Press to bring up the Main menu.
Main display: Press to increase temperature.
Main menu: Press to move the cursor right.
Menu screen: The button function varies with the screen.
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.
Main display: Press to change the fan speed.
Menu screen: The button function varies with the screen.
5Backlit LCD
0Function button [F4]
83
83
Fri
Room
Set temp.
Mode Temp. Fan
Cool Auto
Main Main menu
Energy saving
Main menu: RETURN
Cursor
Operation
Vane·Louver·Vent. (Lossnay)
High power
Comfort
Main menuMain display
Menu screen
7 8 9 0
7 8 9 0
7 8 9 0
Function guide
Controller interface

7
OCH640D
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.)
<Full mode> <Basic mode>
All icons are displayed for explanation.
Most settings (except ON/OFF, mode, fan speed, temperature) can be made from the Main menu.
1Operation mode
2Preset temperature
3Clock
4Fan speed
Functions of the corresponding buttons appear here.
5Button 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.
1Room temperature
Appears when the buttons are locked.
Appears when the Weekly timer is enabled.
Appears while the units are operated in the energy saving
mode. (Will not appear on some models of indoor units)
Appears when the built-in thermistor on the remote
controller is activated to monitor the room temperature (1).
appears when the thermistor on the indoor unit is
activated to monitor the room temperature.
Appears when an energy saving operation is performed us-
ing a “3D i-See sensor” function.
Indicates the louver setting.
Indicates the ventilation setting.
Appears when the preset temperature range is restricted.
Indicates the vane setting.
6
7
8
9
0
2
4
5
7
8
9
)
!
Fri
Mode Temp. Fan
Room
Cool Set temp. Auto
83
83
1
2
3
4
5
6
78
90
1
2 34 5 6 7 8
9
)
@
!
#
$
Display
Appears when the On/O󰀨 timer or Auto-o󰀨 timer function is enabled.
3
appears when the timer is disabled by the centralized control system.
appears when the HOLD function is enable.
6
Appears while the outdoor units are operated in the silent mode.
@
Appears for a certain period of time when a centrally-
controlled item is operated.
#Centrally controlled
An check code appears during the preliminary error.
$Preliminary error display
Fri
Cool
Mode Temp. Fan
Set temp. Auto
$
83
5
4
3
2
1
#

8 9
OCH640D
Not all functions are available on all models of indoor units.
Energy saving
Main menu Press the MENU button.
Move the cursor to the desired item with the F1 and F2 buttons, and press the SELECT button.
Operation
Initial setting menu
Manual vane angle
ON/OFF timer
Auto return
Clock
Main/Sub
Temp. range
Auto-OFF timer
Schedule
Daylight saving time
Clock
Administrator password
Operation locked
3D i-See sensor
High power
Vane · Louver · Vent. (Lossnay)
Comfort
Timer
Energy saving
Basic setting
Display setting
Operation setting
Restriction
Weekly timer
OU silent mode
Timer menu
Main display
Display details
Contrast • Brightness
Language selection
Auto mode
Setback mode
Continue to the next page.

9
OCH640D
Maintenance menu
Service menu
Drain pump test run
Serial No. input
Diagnosis
Initialize remote controller
Remote controller information
Initialize maintenance info.
Test run
Model name input
Function setting
Error history
Maintenance password
Dealer information input
Error information
Test run menu
Maintenance information
Filter information
Cleaning
Settings menu
Check menu
Other menu
Auto descending panel
Descending operation
Self check
Descending adjustment
Remote controller check
Continue from the previous page.
Not all functions are available on all models of indoor units.

10
OCH640D
*1Clock setting is required.
*22°F (1°C) increments.
*3This function can only be set when certain outdoor units are connected.
Main menu list
Main
menu Setting and display items Setting details
Operation Vane · Louver · Vent.
(Lossnay)
Use to set the vane angle.
• Select a desired vane setting from 5 di󰀨erent 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 "O󰀨," "Low," and "High."
High power *3Use to reach the comfortable room temperature quickly.
• Units can be operated in the High-power mode for up to 30 minutes.
Comfort Manual
vane angle
Use to x each vane angle.
3D i-See sensor Use to set the following functions for 3D i-See sensor.
• Air distribution • Energy saving option • Seasonal airow
Timer Timer ON/OFF timer *1Use to set the operation ON/OFF times.
• Time can be set in 5-minute increments.
Auto-O󰀨
timer
Use to set the Auto-O󰀨 time.
• Time can be set to a value from 30 to 240 in 10-minute increments.
Weekly timer *1, *2Use 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.)
OU silent mode *1, *3Use to set the time periods in which priority is given to quiet operation of
outdoor units over temperature control. Set the Start/Stop times for each day
of the week.
•Select the desired silent level from "Normal," "Middle," and "Quiet."
Energy
saving
Restriction Temp. range *2Use to restrict the preset temperature range.
• Di󰀨erent temperature ranges can be set for di󰀨erent operation modes.
Operation
locked
Use to lock selected functions.
• The locked functions cannot be operated.
Energy
saving
Auto return *2Use to get the units to operate at the preset temperature after performing
energy saving 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 *1Set the start/stop times to operate the units in the energy saving mode for
each day of the week, and set the energy saving rate.
• Up to 4 energy saving 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.

OCH640D 11
Main menu Setting and display
items Setting details
Initial
setting
Basic
setting
Main/Sub When connecting 2 remote controllers, one of them needs to be designated as
a sub controller.
Clock Use to set the current time.
Daylight
saving time
Set the daylight saving time.
Administrator
password
The administrator password is required to make the settings for the following
items.
• Timer setting • Energy saving setting • Weekly timer setting
• Restriction setting • Outdoor unit silent mode setting
Display
setting
Main display Use to switch between "Full" and "Basic" modes for the Main display, and use
to change the background colors of the display to black.
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.
Contrast •
Brightness
Use to adjust screen contrast and brightness.
Language
selection
Use to select the desired language.
Operation
setting
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.
Setback
mode
Whether or not to use the Setback mode can be selected by using the button.
This setting is valid only when indoor units with the Setback mode function
are connected.
Maintenance 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.)
Filter information Use to check the lter status.
• The lter sign can be reset.
Cleaning Auto
descending
panel
Use to lift and lower the auto descending panel (Optional parts).
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 • Initialize
maintenance info.
Settings 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".
Diagnosis Self check: Error history of each unit can be checked via the remote controller.
Remote controller check: When the remote controller does not work properly, use
the remote controller checking function to troubleshoot the problem.
Others Maintenance
password
Use to change the maintenance password.
Initialize
remote
controller
Use to initialize the remote controller to the factory shipment status.
Remote con-
troller infor-
mation
Use to display the remote controller model name, software version, and serial
number.

1312
OCH640D
3-3. 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 airflow 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 airflow 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

13
OCH640D
SPECIFICATIONS
4
INDOOR UNIT
Service Ref. PLA-A12EA7
Power supply (phase, cycle, voltage) Single phase, 60 Hz, 208/230 V
Max. Fuse Size A 15
Min Circuit Ampacity A 1
External nish (Panel) PLP-40EAEU: Munsell 6.4Y 8.9/0.4
PLP-41EAEU: Munsell 1.0Y 9.2/0.2
Heat exchanger Plate n coil
Fan Fan (drive) × No. Turbo fan (direct) × 1
Fan motor output kW 0.05
Fan motor F.L.A. 0.26
Airow (Low-Medium2-Medium1-High) CFM (m³/min) 420-460-490-530 (12-13-14-15)
External static pressure
Pa (mmAq) 0 (direct blow)
Booster heater kW –
Operation control & Thermostat Remote controller & built-in
Noise level (Low-Medium2-Medium1-High) dB 27-28-29-30
Field drain pipe O.D. inch (mm) 1-1/4 (32)
Dimensions W inch (mm) MAIN UNIT: 33-1/16 (840) PANEL: 37-13/32 (950)
D inch (mm) MAIN UNIT: 33-1/16 (840) PANEL: 37-13/32 (950)
H inch (mm) MAIN UNIT: 10-3/16 (258) PANEL: 1-9/16 (40)
Weight lb (kg) MAIN UNIT: 46 (21) PANEL: 11 (5)
INDOOR UNIT
Service Ref. PLA-A18EA7
Power supply (phase, cycle, voltage) Single phase, 60 Hz, 208/230 V
Max. Fuse Size A 15
Min Circuit Ampacity A 1
External nish (Panel) PLP-40EAEU: Munsell 6.4Y 8.9/0.4
PLP-41EAEU: Munsell 1.0Y 9.2/0.2
Heat exchanger Plate n coil
Fan Fan (drive) × No. Turbo fan (direct) × 1
Fan motor output kW 0.05
Fan motor F.L.A. 0.34
Airow (Low-Medium2-Medium1-High) CFM (m³/min) 460-490-570-600 (13-14-16-17)
External static pressure
Pa (mmAq) 0 (direct blow)
Booster heater kW –
Operation control & Thermostat Remote controller & built-in
Noise level (Low-Medium2-Medium1-High) dB 28-29-31-32
Field drain pipe O.D. inch (mm) 1-1/4 (32)
Dimensions W inch (mm) MAIN UNIT: 33-1/16 (840) PANEL: 37-13/32 (950)
D inch (mm) MAIN UNIT: 33-1/16 (840) PANEL: 37-13/32 (950)
H inch (mm) MAIN UNIT: 10-3/16 (258) PANEL: 1-9/16 (40)
Weight lb (kg) MAIN UNIT: 46 (21) PANEL: 11 (5)
INDOOR UNIT
Service Ref. PLA-A24EA7
Power supply (phase, cycle, voltage) Single phase, 60 Hz, 208/230 V
Max. Fuse Size A 15
Min Circuit Ampacity A 1
External nish (Panel) PLP-40EAEU: Munsell 6.4Y 8.9/0.4
PLP-41EAEU: Munsell 1.0Y 9.2/0.2
Heat exchanger Plate n coil
Fan Fan (drive) × No. Turbo fan (direct) × 1
Fan motor output kW 0.12
Fan motor F.L.A. 0.49
Airow (Low-Medium2-Medium1-High) CFM (m³/min) 530-640-710-810 (15-18-20-23)
External static pressure
Pa (mmAq) 0 (direct blow)
Booster heater kW –
Operation control & Thermostat Remote controller & built-in
Noise level (Low-Medium2-Medium1-High) dB 28-30-33-36
Field drain pipe O.D. inch (mm) 1-1/4 (32)
Dimensions W inch (mm) MAIN UNIT: 33-1/16 (840) PANEL: 37-13/32 (950)
D inch (mm) MAIN UNIT: 33-1/16 (840) PANEL: 37-13/32 (950)
H inch (mm) MAIN UNIT: 11-3/4 (298) PANEL: 1-9/16 (40)
Weight lb (kg) MAIN UNIT: 56 (25) PANEL: 11 (5)

15
OCH640D 14
INDOOR UNIT
Service Ref. PLA-A30EA7
Power supply (phase, cycle, voltage) Single phase, 60 Hz, 208/230 V
Max. Fuse Size A 15
Min Circuit Ampacity A 1
External nish (Panel) PLP-40EAEU: Munsell 6.4Y 8.9/0.4
PLP-41EAEU: Munsell 1.0Y 9.2/0.2
Heat exchanger Plate n coil
Fan Fan (drive) × No. Turbo fan (direct) × 1
Fan motor output kW 0.12
Fan motor F.L.A. 0.59
Airow (Low-Medium2-Medium1-High) CFM (m³/min) 570-670-780-880 (16-19-22-25)
External static pressure
Pa (mmAq) 0 (direct blow)
Booster heater kW –
Operation control & Thermostat Remote controller & built-in
Noise level (Low-Medium2-Medium1-High) dB 28-32-35-38
Field drain pipe O.D. inch (mm) 1-1/4 (32)
Dimensions W inch (mm) MAIN UNIT: 33-1/16 (840) PANEL: 37-13/32 (950)
D inch (mm) MAIN UNIT: 33-1/16 (840) PANEL: 37-13/32 (950)
H inch (mm) MAIN UNIT: 11-3/4 (298) PANEL: 1-9/16 (40)
Weight lb (kg) MAIN UNIT: 56 (25) PANEL: 11 (5)
INDOOR UNIT
Service Ref. PLA-A36EA7
Power supply (phase, cycle, voltage) Single phase, 60 Hz, 208/230 V
Max. Fuse Size A 15
Min Circuit Ampacity A 2
External nish (Panel) PLP-40EAEU: Munsell 6.4Y 8.9/0.4
PLP-41EAEU: Munsell 1.0Y 9.2/0.2
Heat exchanger Plate n coil
Fan Fan (drive) × No. Turbo fan (direct) × 1
Fan motor output kW 0.12
Fan motor F.L.A. 0.98
Airow (Low-Medium2-Medium1-High) CFM (m³/min) 670-850-1020-1200 (19-24-29-34)
External static pressure
Pa (mmAq) 0 (direct blow)
Booster heater kW –
Operation control & Thermostat Remote controller & built-in
Noise level (Low-Medium2-Medium1-High) dB 32-37-41-44
Field drain pipe O.D. inch (mm) 1-1/4 (32)
Dimensions W inch (mm) MAIN UNIT: 33-1/16 (840) PANEL: 37-13/32 (950)
D inch (mm) MAIN UNIT: 33-1/16 (840) PANEL: 37-13/32 (950)
H inch (mm) MAIN UNIT: 11-3/4 (298) PANEL: 1-9/16 (40)
Weight lb (kg) MAIN UNIT: 56 (25) PANEL: 11 (5)
INDOOR UNIT
Service Ref. PLA-A42EA7
Power supply (phase, cycle, voltage) Single phase, 60 Hz, 208/230 V
Max. Fuse Size A 15
Min Circuit Ampacity A 2
External nish (Panel) PLP-40EAEU: Munsell 6.4Y 8.9/0.4
PLP-41EAEU: Munsell 1.0Y 9.2/0.2
Heat exchanger Plate n coil
Fan Fan (drive) × No. Turbo fan (direct) × 1
Fan motor output kW 0.12
Fan motor F.L.A. 1.05
Airow (Low-Medium2-Medium1-High) CFM (m³/min) 740-920-1060-1200 (21-26-30-34)
External static pressure
Pa (mmAq) 0 (direct blow)
Booster heater kW –
Operation control & Thermostat Remote controller & built-in
Noise level (Low-Medium2-Medium1-High) dB 34-38-42-45
Field drain pipe O.D. inch (mm) 1-1/4 (32)
Dimensions W inch (mm) MAIN UNIT: 33-1/16 (840) PANEL: 37-13/32 (950)
D inch (mm) MAIN UNIT: 33-1/16 (840) PANEL: 37-13/32 (950)
H inch (mm) MAIN UNIT: 11-3/4 (298) PANEL: 1-9/16 (40)
Weight lb (kg) MAIN UNIT: 56 (25) PANEL: 11 (5)

15
OCH640D
5NOISE CRITERION CURVES
PLA-A12EA7 PLA-A18EA7
NOTCH SPL(dB) LINE
High 30
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-A24EA7 PLA-A30EA7
NOTCH SPL(dB) LINE
High 36
Medium1 33
Medium2 30
Low 28
NOTCH SPL(dB) LINE
High 38
Medium1 35
Medium2 32
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)

1716
OCH640D
PLA-A36EA7 PLA-A42EA7
NOTCH SPL(dB) LINE
High 44
Medium1 41
Medium2 37
Low 32
NOTCH SPL(dB) LINE
High 45
Medium1 42
Medium2 38
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)
MAIN UNIT
5 ft
MICROPHONE
CEILING

17
OCH640D
PLA-A12EA7 PLA-A18EA7 PLA-A24EA7
PLA-A30EA7 PLA-A36EA7 PLA-A42EA7
6OUTLINES AND DIMENSIONS
Unit: inch (mm)

18 19
OCH640D
7WIRING DIAGRAM
PLA-A12EA7 PLA-A18EA7 PLA-A24EA7
PLA-A30EA7 PLA-A36EA7 PLA-A42EA7

19
OCH640D
Pipe temperature
thermistor/liquid (TH2)
Distributor
with strainer (#50)
Condenser/evaporator
temperature thermistor (TH5)
Room temperature
thermistor (TH1)
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-A12EA7 PLA-A18EA7 PLA-A24EA7
PLA-A30EA7 PLA-A36EA7 PLA-A42EA7

2120
OCH640D
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-
door unit. 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