Mitsubishi Electric Mr.Slim PLA-P3AA Operating manual

TECHNICAL & SERVICE MANUAL
CONTENTS
1. TECHNICAL CHANGES······························2
2. COMBINATION OF INDOORAND OUTDOOR UNITS··3
3. SAFETY PRECAUTION·······························3
4. PART NAMES AND FUNCTIONS ···············5
5. SPECIFICATIONS ······································11
6. DATA ··························································23
7. OUTLINES AND DIMENSIONS·················52
8. WIRING DIAGRAM ····································53
9. REFRIGERANT SYSTEM DIAGRAM ··············54
10. TROUBLESHOOTING ·······························58
11. DISASSEMBLY PROCEDURE ··················60
12. PARTS LIST···············································63
13. OPTIONAL PARTS ····································68
Indoor unit
[Model names]
PLA-P3AA
PLA-P4AA
PLA-P5AA
PLA-P6AA
No.OC241
REVISED EDITION-B
Ceiling Cassettes
Series PLA
FILTER
CHECK MODE
TEST RUN
WIRED REMOTE
CONTROLLER
[Service Ref.]
PLA-P3AA.UK
PLA-P3AA1.UK
PLA-P4AA.UK
PLA-P4AA1.UK
PLA-P5AA.UK
PLA-P5AA1.UK
PLA-P6AA.UK
PLA-P6AA1.UK
R407C
ON/OFF
WIRELESS REMOTE
CONTROLLER
SPLIT-TYPE AIR CONDITIONERS
ON/OFF TEMP
MODEL SELECT
NOTAVAILABLE
CHECK TEST RUN
˚C
AMPM
AMPM
ON/OFF
CENTRALLY CONTROLLED
ERROR CODE
CLOCK
ON OFF
˚C
CHECK
CHECK MODE
FILTER
TEST RUN
FUNCTION
˚C
1Hr.
NOT AVAILABLE
STAND BY
DEFROST
TEMP.
PLA-P•AA.UK PLA-P•AA1.UK
PLA-P•AA.UK PLA-P•AA1.UK
Model name
indication
Revision:
• “12. PARTS LIST” has been
modified.
• Program timer <PAC-YT32PTA>
has been added in
“13. OPTIONAL PARTS”.
• Please void OC241 REVISED
EDITION-A.
Note:
• Refer to the OCT03 REVISED
EDITION-E as for control
relation. This manual does
not cover outdoor units. When
servicing them, please refer to
the service manual No.OC180
REVISED EDITION-A OC261
and this manual in a set.
OC241-B-1.qxp 04.9.29 5:16 PM Page 1

2
1TECHNICAL CHANGES
PLA-P3AA.UK ➔PLA-P3AA1PLA-P4AA.UK ➔PLA-P4AA1.UK
PLA-P5AA.UK ➔PLA-P5AA1PLA-P6AA.UK ➔PLA-P6AA1.UK
●REMOTE CONTROLLER has changed. (PAR-S27A-E ➔PAR-20MAA-E, PAR-SL95A-E ➔PAR-SL97A-E)
●Outdoor unit which are connected to PLA-P•AA.UK and PLA-P•AA1.UK have been added.
Revision:
1. “ 12. PARTS LIST ” has been modified on page 65, 66 and 67.
Service Ref.
Page IncorrectRevise point Correct
65
66
67
FUNCTIONAL PARTS
No.7 HEAT
EXCHANGE
FUNCTIONAL PARTS
No.12 TERMINAL
BLOCK
FUNCTIONAL PARTS
No.12 TERMINAL
BLOCK
S70 E24 480S70 E21 480
S70 E25 480S70 E22 480
S70 E01 716S70 517 716
PLA-P5AA.UK
PLA-P5AA1.UK
PLA-P3AA.UK
PLA-P3AA1.UK
PLA-P4AA.UK
PLA-P4AA1.UK
PLA-P3AA.UK
PLA-P3AA1.UK
PLA-P4AA.UK
PLA-P4AA1.UK
PLA-P5AA.UK
PLA-P5AA1.UK
PLA-P6AA.UK
PLA-P6AA1.UK
PLA-P5AA.UK
PLA-P5AA1.UK
PLA-P6AA.UK
PLA-P6AA1.UK
PLA-P6AA.UK
PLA-P6AA1.UK
Service Ref.
Page Old
parts code
Revise point New
part code
66
67
FUNCTIONAL PARTS
No.7 INDOOR
CONTROLLER
BOARD
FUNCTIONAL PARTS
No.7 INDOOR
CONTROLLER
BOARD
S70 E20 310*
S70 E24 310
S70 E25 310
S70 E26 310
S70 E27 310
PLA-P3AA.UK
PLA-P3AA1.UK
PLA-P4AA.UK
PLA-P4AA1.UK
PLA-P5AA.UK
PLA-P5AA1.UK
PLA-P6AA.UK
PLA-P6AA1.UK
Service Ref.
Page Old
part code
Revise point New
part code
66
67
FUNCTIONAL PARTS
No.3 DRAIN PUMP
FUNCTIONAL PARTS
No.3 DRAIN PUMP
S70 E02 355S70 E01 355
Spare INDOOR CONTROLLER BOARD for PLA-P3AA.UK, PLA-P3AA1.UK, PLA-P4AA.UK,
PLA-P4AA1.UK, PLA-P5AA.UK, PLA-P5AA1.UK, PLA-P6AA.UK and PLA-P6AA1.UK are unified.
DRAIN PUMP has been changed.
2. The description “The part name of symbol “I.B” is “SPCB” ” is added on both pages of wiring diagram and part list.
OC241-B-1.qxp 04.9.29 5:16 PM Page 2

3
COMBINATION OF INDOOR AND OUTDOOR UNITS
2
SAFETY PRECAUTION
3
Cautions for devices that use R407C refrigerant.
· Do not use the existing refrigerant piping.
-The old refrigerant and lubricating oil in the existing piping contains a large amount of chlorine which may cause the lubricating
oil of the new unit to deteriorate.
· Use “low residual oil piping”.
-If there is a large amount of residual oil (hydraulic oil, etc.) inside the piping and joints, deterioration of the lubricating oil will
result.
· Store the piping to be used during installation indoors and keep both ends of the piping sealed until just before
brazing. (Store elbows and other joints in a plastic bag.)
-If dust, dirt, or water enters the refrigerant cycle, deterioration of the oil and compressor trouble may result.
· Use Suniso 4GS or 3GS (small amount) as the lubricating oil to coat flares and flange connection parts.
-The lubricating oil used with the air conditioner is highly hygroscopic. If it is used, water may be mixed in and deterioration
of the lubricating oil may result.
· Use liquid refrigerant to charge the system.
-If gas refrigerant is used to charge the system, the composition of the refrigerant in the cylinder will change and perfor-
mance may drop.
· Do not use a refrigerant other than R407C.
-If another refrigerant (R22, etc.) is used, the chlorine in the refrigerant may cause the lubricating oil to deteriorate.
· Use a vacuum pump with a reverse flow check valve.
-The vacuum pump oil may flow back into the refrigerant cycle and cause the lubricating oil to deteriorate.
Heat pump type Outdoor unit
PUH-P Cooling only type PU-P
Heat pump without
electric heater
or
Cooling only
6
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Indoor unit
PLA-P3AA.UK
PLA-P4AA.UK
PLA-P5AA.UK
PLA-P6AA.UK
3
3
Heat pump type Outdoor unit
PUH-P Cooling only type PU-P
Heat pump without
electric heater
or
Cooling only
6
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5
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Indoor unit
PLA-P3AA.UK
PLA-P3AA1.UK
PLA-P4AA.UK
PLA-P4AA1.UK
PLA-P5AA.UK
PLA-P5AA1.UK
PLA-P6AA.UK
PLA-P6AA1.UK
3434
OC241-B-1.qxp 04.9.29 5:16 PM Page 3

4
[1] Service tools
Use the below service tools as exclusive tools for R407C refrigerant.
No. Tool name Specifications
1Gauge manifold ·Only for R407C.
·Use the existing fitting SPECIFICATIONS. (UNF7/16)
·Use high-tension side pressure of 35kgf/cm2or over.
2Charge hose ·Only for R407C.
·Use pressure performance of 52kgf/cm2or over.
3Electronic scale
4Gas leak detector ·Use the detector for R134a or R407C.
5Adapter for reverse flow check. ·Attach on vacuum pump.
6Refrigerant charge base.
7Refrigerant cylinder. ·For R407C ·Top of cylinder (Brown)
·Cylinder with syphon
8Refrigerant recovery equipment.
[2] Notice on repair service
·After recovering all the refrigerant in the unit, work may be started.
·Do not release the refrigerant in the air.
·After completing the repair service, recharge the system with the specified amount of the
liquid refrigerant.
[3] Refrigerant recharging
(1) Refrigerant recharging process
Direct charging from the cylinder.
·Confirm that the cylinder is suitable for syphoning.
·Raise the cylinder and recharge the unit by syphoning liquid refrigerant.
(2) Recharge when refrigerant leakage has occurred.
·After recovering all the refrigerant in the unit, work may be started.
·Do not release the refrigerant in the air.
·After completing the repair service, recharge the system with the specified amount of
the liquid refrigerant.
Gravimeter
Unit
OC241-B-1.qxp 04.9.29 5:16 PM Page 4

5
PART NAMES AND FUNCTIONS
4
On the controls are set, the same operation mode can be repeated by simply pressing the ON/OFF button.
PAR-S27AA
● Operation buttons
CHECK-TEST RUN button
Only press this button to per-
form an inspection check or test
operation, Do not use it for nor-
mal operation.
(Not available for this model.)
button
This switches the horizontal fan
motion ON and OFF.
FILTER button
This resets the filter cleaning indica-
tion display.
ON/OFF button
This switches between the operation
and stop modes each time it is
pressed. The lamp on this button
lights during operation.
button
This adjusts the vertical angle of the
ventilation.
button
This sets the ventilation fan
speed.
button
This sets the current time. start
time and stop time.
button
This switches between continuous
operation and the timer operation.
TEMP. button
This sets the room temperature, The
temperature setting can be performed
in 1°C units
Setting range
Cooling 19°C to 30°C
Heating 17°C to 28°C
button
Press this button to switch the cooling,
electronic dry (dehumidify), automatic
and heating modes.
This model name of the remote con-
troller is indicated.
Auto Air Swing Vane
Disperses airflow up and
down and adjusts the angle
of airflow direction.
Grille
Filter
Removes dust and pollutants
from intake air
Horizontal Air Outlet
Sets airflow of horizontal automatically
during cooling or dehumidifying.
Air Intake
Intakes air from room.
● Indoor Unit
PLA-P3AA.UK, PLA-P4AA.UK, PLA-P5AA.UK, PLA-P6AA.UK
PLA-P3AA1.UK, PLA-P4AA1.UK, PLA-P5AA1.UK, PLA-P6AA1.UK
button
This sets the ventilation fan speed.
● Wired remote controller
PLA-P3AA.UK, PLA-P4AA.UK, PLA-P5AA.UK, PLA-P6AA.UK
OC241-B-1.qxp 04.9.29 5:16 PM Page 5

6
Caution
●Only the display lights when the unit is stopped and power supplied to the unit.
●When power is turned ON for the first time the (CENTRAL CTRL) display appears to go off momentarily but this is not a
malfunction.
●“NOT AVAILABLE” is displayed when the button are pressed.This indicates that this room unit is not equipped with
the fan direction adjustment function and the louver function.
● When power is turned ON for the first time , it is normal that “HO” is displayed on the room temperature indication (For max.
2minutes ).
Please wait until this “HO” indication disappear than start the operation.
Operation lamp
This lamp lights during operation,
goes off when the unit stops and
flashes when a malfunction occurs.
CENTRALLY
CONTROLLED display
This indicates when the unit is con-
trolled by optional features such as
central control type remote controller.
display
This indicates when the continuous
operation and time operation modes
are set.
It also display the time for the timer
operation at the same time as when
it is set.
OPERATION MODE display
This indicates the operation mode.
STANDBY display
The [STANDBY] symbol is only dis-
played from the time the heating
operation starts until the heated air
begins to blow.
DEFROST display
This indicates when the defrost oper-
ation is performed.
CHECK display
This indicates when a malfunction
has occurred in the unit which should
be checked.
display
This lamp lights when electricity is
supplied to the unit.
display
This displays the selected setting
temperature.
display
The current time , start time and stop
time can be displayed in ten second
intervals by pressing the time setting
button. The start time or stop time is
always displayed during the timer
operation.
display
The selected fan speed is displayed.
●Display
display
The temperature of the suction air is
displayed during operation. The dis-
play range is 10° to 35°C. The dis-
play flashes 10°C when the actual
temperature is less than 10° and
flashes 35°C when the actual tem-
perature is greater than 35°C.
In this display example on the bot-
tom left, a condition where all dis-
play lamps light is shown for expla-
nation purposes although this differs
from actual operation.
display
This display lights in the check mode
or when a test operation is per-
formed.
CHECK MODE
TEST RUN
display
This lamp lights when the filter need
to be cleaned.
FILTER
display
This displays the air
direction.
OC241-B-1.qxp 04.9.29 5:16 PM Page 6

7
● Operation buttons
PAR-20MAA
ON/OFF
CENTRALLY CONTROLLED
ERROR CODE
CLOCK
ON OFF
˚C
CHECK
CHECK MODE
FILTER
TEST RUN
FUNCTION
˚C
1Hr.
NOT AVAILABLE
STAND BY
DEFROST
FILTER
CHECK TEST
TEMP.
TIMER SET
This sets the ventilation fan speed.
VENTILATION button
Press this button to switch the cooler,
electronic dry (dehumidify), automatic
and heater modes.
OPERATION SWITCH button
This sets the room temperature. The
temperature setting can be performed
in 1:units
Setting range
Cooler 19:to 30:
Heater 17:to 28:
TEMP. ADJUSTMENT button
This switches between continuous
operation and the timer operation.
TIMER button
This switches between the operation
and stop modes each time it is pressed.
The lamp on this button lights during
operation.
ON/OFF button
Only press this button to perform an
inspection check or test operation.
Do not use it for normal operation.
CHECK-TEST RUN button
This switch the horizontal fan motion
ON and OFF.
(Not available for this model.)
LOUVER button
This adjusts the vertical angle of the
ventilation.
AIR DIRECTION button
This resets the filter service indication
display
FILTER button
This sets the current time, start time
and stop time.
TIME SETTING button
This sets the ventilation fan speed.
AIR SPEED button
PLA-P3AA1.UK, PLA-P4AA1.UK, PLA-P5AA1.UK, PLA-P6AA1.UK
OC241-B-1.qxp 04.9.29 5:16 PM Page 7

8
Caution
●Only the Power display lights when the unit is stopped and power supplied to the unit.
●“NOT AVAILABLE” is displayed when the Air speed button are pressed.This indicates that this room unit is not equipped
with the fan direction adjustment function and the louver function.
●When power is turned ON for the first time, it is normal that “H0” is displayed on the room temperature indication (For max.
2minutes). Please wait until this “H0” indication disappear then start the operation.
CENTRALLY
CONTROLLED display
This indicates when the unit is con-
trolled by optional features such as
central control type remote controller.
TIMER display
This indicates when the continuous
operation and time operation modes
are set.
It also display the time for the timer
operation at the same time as when
it is set.
OPERATION MODE display
This indicates the operation mode.
STANDBY display
The [STANDBY] symbol is only dis-
played from the time the heating
operation starts unit the heated air
begins to blow.
DEFROST display
This indicates when the defrost oper-
ation is performed.
CHECK display
This indicates when a malfunction
has occurred in the unit which should
be checked.
CLOCK display
The current time , start time and stop
time can be displayed in ten second
intervals by pressing the time switch
button. The start time or stop time is
always displayed during the timer
operation.
●Display
In this display example on the bot-
tom left, a condition where all dis-
play lamps light is shown for expla-
nation purposes although this differs
from actual operation.
Operation lamp
This lamp lights during operation,
goes off when the unit stops and
flashes when a malfunction occurs.
POWER display
This lamp lights when electricity is
supplied to the unit.
SET TEMPERATURE display
This displays the selected setting
temperature.
AIR DIRECTION display
This displays the air direction.
ROOM TEMPERATURE display
The temperature of the suction air
is displayed during operation. The
display range is 8°C to 39°C. The
display flashes 8°C when the actual
temperature is less than 8°C and
flashes 39°C when the actual tem-
perature is greater than 39°C.
display
This display lights in the check mode
or when a test operation is per-
formed.
CHECK MODE
TEST RUN
This lamp lights when the filter need
to be cleaned.
AIR SPEED display
The selected fan speed is displayed.
FILTER display
PAR-20MAA
ON/OFF
CENTRALLY CONTROLLED
ERROR CODE
CLOCK
ON OFF
˚C
CHECK
CHECK MODE
FILTER
TEST RUN
FUNCTION
˚C
1Hr.
NOT AVAILABLE
STAND BY
DEFROST
FILTER
CHECK TEST
TEMP.
TIMER SET
OC241-B-1.qxp 04.9.29 5:16 PM Page 8

9
● Wireless remote controller
PLA-P3AA.UK, PLA-P4AA.UK, PLA-P5AA.UK, PLA-P6AA.UK
●When cover is open.
ON/OFF
RESET
MODE FAN
VANE
TEMP.
START
STOP
HR.
MIN.
ON/OFF
CHECK
ADDRESS
UNIT No.
FUNCTION No.
SELECTION No.
AM
PM
RESET
AM
PM
TEST RUN
FUNCTION
˚C
MODE FAN
VANE
TEMP.
START
STOP
HR.
MIN.
display
OPERATION MODE display
Operation mode display indicates which oper-
ation mode is in effect.
display
Displays when batteries are dead.
display
Lights up when function are set.
display
The unit is turned ON and OFF alternately
each time the button is pressed.
display
The vertical direction of airflow is indicated.
display
FAN SPEED display indicates which fan
speed has been selected.
MODE SELECT button
Used to switch the operation mode between
cooling , drying , blowing , heating and auto
mode.
FAN SPEED SELECT button
Used to change the fan speed.
VANE CONTROL button
Used to change the airflow direction.
display
SET TEMP. display indicates desired tempera-
ture set.
CLOCK display
DIsplays the current time.
“ ”display
Flashes when the current time is displayed.
TIMER display
Displays when in timer operation or when set-
ting timer.
“ ” “ ” display
Displays the order of timer operation.
“ ” “ ” display
Displays whether timer is on or off.
HR. and MIN.buttons
Buttons used to set the “hour and minute” of
the current time and timer settings.
➡
➡
“ ” “ ” display
Displays when the current time and the timer
time can be changed.
▼
▼
●When cover is open.
TEMP. button
SET TEMPERATURE button sets any desired
room temperature.
TIMER CONTROL buttons
STOP (OFF timer): when this switch is set,
the air conditioner will be automatically
stopped at the preset time.
START (ON timer): when this switch is set, the
air conditioner will be automatically started at
the preset time.
• TEST RUN • CHECK display
CHECK&TEST RUN display indicates that the
unit is being checked or test-run.
• FUNCTION
SELECTION NO. display
Displays the selection number..
UNIT NO. display
Displays the number of unit..
FUNCTION NO. display
Displays the mode.
ADDRESS display
Displays the refrigerant address.
display
Lights up while transmission to the indoor unit
is mode using switches.
RESET button
button
OC241-B-1.qxp 04.9.29 5:16 PM Page 9

10
PLA-P3AA1.UK, PLA-P4AA1.UK, PLA-P5AA1.UK, PLA-P6AA1.UK
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.
LOUVER button
This switch the horizontal fan motion ON
and OFF.
(Not available for this model.)
MODE SELECT button
Used to switch the operation mode between
cooling, drying, blowing, heating and auto
mode.
CHECK-TEST RUN button
Only press this button to perform an inspec-
tion 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.
wIn case the outdoor unit is cool only type,
the heating mode is not available.
Buttons used to set the “hour and minute” of
the current time and timer settings.
h and min buttons
display
SET TEMP. display indicates desired temper-
ature set.
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
Lights up while transmission to the indoor
unit is mode using switches.
display
CHECK&TEST RUN display indicates that
the unit is being checked or test-run.
display
OPERATION MODE display
Operation mode display indicates which op-
eration mode is in effect.
TIMER CONTROL buttons
AUTO STOP (OFF timer): when this switch
is set, the air conditioner will be au-
tomatically stopped at the preset time.
AUTO START (ON timer): when this switch
is set, the air conditioner will be automatical-
ly started at the preset time.
MODEL SELECT
CHECK TEST RUN
OC241-B-1.qxp 04.9.29 5:16 PM Page 10