Mitsubishi Electric PLA-RP3AA Operating manual

TECHNICAL & SERVICE MANUAL

CONTENTS

1. TECHNICAL CHANGES······························2

COMBINATION OF INDOOR AND OUTDOOR UNITS

···3

3. SAFETY PRECAUTION·······························4

4. PART NAMES AND FUNCTIONS ···············8

5. SPECIFICATIONS ······································11

6. DATA ··························································23

7. OUTLINES AND DIMENSIONS·················62

8. WIRING DIAGRAM ····································63

9. REFRIGERANT SYSTEM DIAGRAM········64

10. TROUBLESHOOTING ·······························65

11. DISASSEMBLY PROCEDURE ··················76

12. PARTS LIST···············································79

13. OPTIONAL PARTS ····································86

Indoor unit

[Model names] [Service Ref.]

PLA-RP1.6AA PLA-RP1.6AA

PLA-RP2AA PLA-RP2AA

PLA-RP2.5AA PLA-RP2.5AA

PLA-RP3AA PLA-RP3AA

PLA-RP3AA1

PLA-RP4AA PLA-RP4AA

PLA-RP4AA1

PLA-RP5AA PLA-RP5AA

PLA-RP5AA1

PLA-RP6AA PLA-RP6AA

PLA-RP6AA1

No.OC293

REVISED EDITION-B

• PLA-RP1.6AA, PLA-RP2AA

and PLA-RP2.5AA are added in

REVISED EDITION-B.

• This manual does not cover outdoor

units.

When serving them, please refer to

the service manual No.OC294

REVISED EDITION-B, OC285

REVISED EDITION-A, OC298 and

this manual in a set.

INDOOR UNIT

Ceiling Cassettes

Series PLA

WIRED REMOTE

CONTROLLER

R407C/R410A

WIRELESS REMOTE

CONTROLLER

ON/OFF TEMP

MODEL SELECT

NOT AVAILABLE

CHECK

TEST RUN

˚C

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.

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

SPLIT-TYPE, AIR CONDITIONERS

•Please void OC293 REVISED

EDITION-A.

2004

Model name

indication

OC293-B-1.qxp 04.9.29 4:09 PM Page 1

1TECHNICAL CHANGES

REVISED EDITION-B

• PLA-RP1.6AA, PLA-RP2AA and PLA-RP2.5AA are added in REVISED EDITION-B.

REVISED EDITION-A

PLA-RP3,4,5,6AA

PLA-RP3,4,5,6AA1

1. The units that can be connected have been changed as follows.

OFF

4321

OFF

4321

PLA-RP5AA1

2. Because of additional connectable outdoor units, the setting of SW2 (capacity setting) on the indoor

controller board has also been changed.

PLA-RP5AA PLA-RP5AA1

Note: PLA-RP5AA1can connect to PUHZ-RP5VHA, PUH-P5YGAA

and PU-P5YGAA. PLA-RP5AA, however, can connect to

PUHZ-RP5VHA only.

PUHZ-RP3VHA

PUHZ-RP4VHA

PUHZ-RP5VHA

PUHZ-RP6VHA

OC294

R410A

●OC293 (PLA-RP•AA) ●OC293 REVISED EDITION-A (PLA-RP•AA, AA1)

PUHZ-RP3VHA

PUHZ-RP4VHA

PUHZ-RP5VHA

PUHZ-RP6VHA

OC294

R410A PUH-P3VGAA

PUH-P3YGAA

PUH-P4YGAA

PUH-P5YGAA

PUH-P6YGAA

PU-P3VGAA

PU-P3YGAA

PU-P4YGAA

PU-P5YGAA

PU-P6YGAA

OC285 OC298

R407C

OC293-B-1.qxp 04.9.29 4:09 PM Page 2

COMBINATION OF INDOOR AND OUTDOOR UNITS

Heat pump type

Outdoor unit [OC285 REVISED EDITION-A]

PUH-P

Heat pump without

electric heater

YGAA

YGAA1

—

YGAA

YGAA1

—

YGAA

—

YGAA

—

VGAA

—

VGAA

—

VGAA

—

VGAA

—

Indoor unit

Outdoor unit [OC298]

Indoor unit

PLA-RP1.6AA

PLA-RP2AA

PLA-RP2.5AA

PLA-RP3AA

PLA-RP3AA1

PLA-RP4AA

PLA-RP4AA1

PLA-RP5AA

PLA-RP5AA1

PLA-RP6AA

PLA-RP6AA1

PLA-RP1.6AA

PLA-RP2AA

PLA-RP2.5AA

PLA-RP3AA

PLA-RP3AA1

PLA-RP4AA

PLA-RP4AA1

PLA-RP5AA

PLA-RP5AA1

PLA-RP6AA

PLA-RP6AA1

1.6 2 2.5

Cooling only type

PU-P 6

YGAA

—

YGAA

—

YGAA

—

YGAA

—

VGAA

—

VGAA

—

VGAA

—

VGAA

—

Cooling only

(R407C Fixed speed)

Heat pump type

Outdoor unit [OC294 REVISED EDITION-B]

PUHZ-RP 6

VHA

VHA1

—

VHA

VHA1

—

VHA

—

VHA

—

VHA

—

VHA

—

VHA

VHA1

—

Indoor unit

PLA-RP1.6AA

PLA-RP2AA

PLA-RP2.5AA

PLA-RP3AA

PLA-RP3AA1

PLA-RP4AA

PLA-RP4AA1

PLA-RP5AA

PLA-RP5AA1

PLA-RP6AA

PLA-RP6AA1

321.6 2.5 4

(R410A Inverter)

OC293-B-1.qxp 04.9.29 4:09 PM Page 3

3SAFETY PRECAUTION

[2] Refrigerant recharging

(1) Refrigerant recharging process

1Direct charging from the cylinder.

·R407C cylinder are available on the market has a syphon pipe.

·Leave the syphon pipe cylinder standing and recharge it.

(By liquid refrigerant)

(2) Recharge in refrigerant leakage case

·After recovering the all refrigerant in the unit, proceed to working.

·Do not release the refrigerant in the air.

·After completing the repair service, recharge the cycle with the specified amount of

liquid refrigerant.

[1] Cautions for service

·After recovering the all refrigerant in the unit, proceed to working.

·Do not release refrigerant in the air.

·After completing the repair service, recharge the cycle with the specified amount of

liquid refrigerant.

Cautions for units utilizing refrigerant R407C

CAUTIONS RELATED TO NEW REFRIGERANT

Do not use the existing refrigerant piping.

The old refrigerant and lubricant in the existing piping

contains a large amount of chlorine which may cause the

lubricant deterioration of the new unit.

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 lubricant

will result.

Use ESTR , ETHER or HAB as the lubricant to

coat flares and flange connection parts.

If large amount of mineral oil enter, that can cause

deterioration of refrigerant oil etc.

Use liquid refrigerant to charge the system.

If gas refrigerant is used to seal the system, the composition

of the refrigerant in the cylinder will change and performance

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 lubricant deterioration.

Use a vacuum pump with a reverse flow check valve.

The vacuum pump oil may flow back into the refrigerant

cycle and cause the lubricant deterioration.

Store the piping to be used during installation

indoors with keep both ends 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. Ventilate the room if refrigerant leaks during

operation. If refrigerant comes into contact with

a flame, poisonous gases will be released.

Gravimeter

Unit

OC293-B-1.qxp 04.9.29 4:09 PM Page 4

[3] 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 3.43MPa·G or over.

2Charge hose ·Only for R407C.

·Use pressure performance of 5.10MPa·G or 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.

OC293-B-1.qxp 04.9.29 4:09 PM Page 5

Cautions for units utilising 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.)

OC293-B-1.qxp 04.9.29 4:09 PM Page 6

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

OC293-B-1.qxp 04.9.29 4:09 PM Page 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 between

cool,

dry, automatic and heat 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

To 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

PART NAMES AND FUNCTIONS

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 Unit

● Wired remote controller

OC293-B-1.qxp 04.9.29 4:09 PM Page 8

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 is 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 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.

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

OC293-B-1.qxp 04.9.29 4:09 PM Page 9

ON/OFF TEMP

FAN

VANE

TEST RUN

AUTO STOP

AUTO START

min

LOUVER

MODE

CHECK

RESETSET CLOCK

MODEL SELECT

NOT AVAILABLE

CHECK

TEST RUN

˚C

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

● Wireless remote controller

OC293-B-1.qxp 04.9.29 4:09 PM Page 10

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