Mitsubishi Electric Mr.Slim PLA-RP3AA User manual

TECHNICAL & SERVICE MANUAL
CONTENTS
1. SAFETY PRECAUTION·······························2
2. PART NAMES AND FUNCTIONS ···············4
3. SPECIFICATIONS········································7
4. DATA···························································11
5. OUTLINES AND DIMENSIONS·················23
6. WIRING DIAGRAM ····································24
7. REFRIGERANT SYSTEM DIAGRAM ···········25
8. TROUBLESHOOTING ·······························26
9. DISASSEMBLY PROCEDURE ··················37
10. PARTS LIST···············································40
11. OPTIONAL PARTS·····································46
Indoor unit
[Model names] [Service Ref.]
PLA-RP3AA PLA-RP3AA.UK
PLA-RP4AA PLA-RP4AA.UK
PLA-RP5AA PLA-RP5AA.UK
PLA-RP6AA PLA-RP6AA.UK
No.OC297
• Refer to the OCT04 as for control
relation.This manual does not cover
outdoor units.
When serving them, please refer to
the service manual No.OC294 and
this manual in a set.
INDOOR UNIT
Ceiling Cassettes
Series PLA
WIRED REMOTE
CONTROLLER
R410A
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.
OC297-1.qxp 03.6.9 4:24 PM Page 1

<Cautions for units utilizing refrigerant R410A>
CAUTIONS RELATED TO NEW REFRIGERANT
Use new refrigerant pipes.
Make sure that the inside and outside of refrige-
rant piping is clean and it has no contamination
such as sulfur hazardous for use, oxides, dirt,
shaving particles, etc.
In addition, use pipes with specified thickness.
Store the piping to be used during installation
indoors and keep both ends of the piping sealed
until just before brazing. (Leave elbow joints, etc.
in their packaging.)
Use ester oil, ether oil or alkylbenzene oil (small
amount) as the refrigerant oil applied to flares
and flange connections.
In case of using the existing pipes for R22, be careful with
the followings.
· For RP4, 5 and 6, be sure to perform replacement opera-
tion before test run.
· 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.
Keep the tools with care.
If dirt, dust or moisture enter 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 enter into refrigerant cycle, that can
cause deterioration of refrigerant oil or malfunction of com-
pressor.
If large amount of mineral oil enter, 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.
[1] Cautions for service
(1) Perform service after collecting 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 on the market is syphon type.
· Charging should be performed with the cylinder of syphon stood vertically. (Refrigerant is charged from liquid phase.)
2
1SAFETY PRECAUTION
OC297-1.qxp 03.6.9 4:24 PM Page 2

Gravimeter
Unit
[3] Service tools
Use the below service tools as exclusive tools for R410A refrigerant.
No. 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
OC297-1.qxp 03.6.9 4:24 PM Page 3

● 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 cooling,
electronic dry (dehumidify), automatic
and heating modes.
OPERATION SWITCH button
This sets the room temperature. The
temperature setting can be performed
in 1:units
Setting range
Cooling 19:to 30:
Heating 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.
FAN SPEED button
PLA-RP3AA.UK, PLA-RP4AA.UK, PLA-RP5AA.UK, PLA-RP6AA.UK
4
PART NAMES AND FUNCTIONS
2
On the controls are set, the same operation mode can be repeated by simply pressing the ON/OFF button.
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 (Main) Unit
PLA-RP3AA.UK, PLA-RP4AA.UK, PLA-RP5AA.UK, PLA-RP6AA.UK
● Wired remote controller
OC297-1.qxp 03.6.9 4:24 PM Page 4

5
Caution
●Only the Power display lights when the unit is stopped and power supplied to the unit.
●When the central control remote control unit, which is sold separately, is used the ON-OFF button, operation switch button
and TEMP. adjustment button do not operate.
●“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
OC297-1.qxp 03.6.9 4:24 PM Page 5