Mitsubishi Electric PUZ-A NHA Series Manuale utente

SERVICE MANUAL

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

SPLIT-TYPE, AIR CONDITIONERS

No. OC370

REVISED EDITION-B

CONTENTS

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

2. REFERENCE MANUAL ······································2

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

4. PART NAMES AND FUNCTIONS ···················5

5. SPECIFICATIONS············································8

6. NOISE CRITERION CURVES························10

7. OUTLINES AND DIMENSIONS·····················11

WIRING DIAGRAM

············································12

REFRIGERANT SYSTEM DIAGRAM

··················13

10. TROUBLESHOOTING ···································14

11. DISASSEMBLY PROCEDURE·······················30

12. PARTS LIST···················································33

13. RoHS PARTS LIST ········································38

Indoor unit

[Model names] [Service Ref.]

PLA-A12AA PLA-A12AA PLA-A12AA1

PLA-A18AA PLA-A18AA PLA-A18AA1

PLA-A24AA PLA-A24AA PLA-A24AA1

PLA-A30AA PLA-A30AA PLA-A30AA1

PLA-A36AA PLA-A36AA PLA-A36AA1

PLA-A42AA PLA-A42AA PLA-A42AA1

June 2007

INDOOR UNIT

WIRED REMOTE

CONTROLLER

WIRELESS REMOTE

CONTROLLER

ON/OFF TEMP

ON/OFF

TEMP.

Model name

indication

3 3 2 2 3

NOTE:

• This manual describes only

service data of the indoor

units.

• RoHS compliant products

have <G> mark on the spec

name plate.

• For servicing RoHS compliant

products, refer to the RoHS

PARTS LIST.

Revision:

• WIRING DIAGRAM has been

changed in REVISED EDI-

TION-B.

• Some descriptions have been

modified.

• Please void OC370 REVISED

EDITION-A.

OC370B--1.qxp 07.6.20 2:42 PM Page 1

1TECHNICAL CHANGES

2REFERENCE MANUAL

Service Ref.

PUZ-A18/24/30/36/42NHA

PUZ-A18/24/30/36/42NHA-BS

PUY-A12/18/24/30/36/42NHA

(1)

PUY-A12/18/24/30/36/42NHA

(1)

-BS

Service Manual No.

OC367

2-1. OUTDOOR UNIT SERVICE MANUAL

Series (Outdoor unit)

PUZ-A·NHA(-BS)

PUY-A·NHA(-BS)

Manual No.

OCS04

2-2. TECHNICAL DATA BOOK

PLA-A12AA ➔PLA-A12AA1

PLA-A18AA ➔PLA-A18AA1

PLA-A24AA ➔PLA-A24AA1

PLA-A30AA ➔PLA-A30AA1

PLA-A36AA ➔PLA-A36AA1

PLA-A42AA ➔PLA-A42AA1

• Indoor controller board has been changed.

OC370B--1.qxp 07.6.20 2:42 PM Page 2

SAFETY PRECAUTION

Cautions for units utilising refrigerant R410A

3-2. 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.

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 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 dirt, dust or moisture enters into refrigerant cycle, that can

cause deterioration of refrigerant oil or malfunction of com-

pressor.

If large amount of mineral oil enters, 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 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.

3-1. ALWAYS OBSERVE FOR SAFETY

Before obtaining access to terminals, all supply

circuits must be disconnected.

OC370B--1.qxp 07.6.20 2:42 PM Page 3

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

[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.)

OC370B--1.qxp 07.6.20 2:42 PM Page 4

PART NAMES AND FUNCTIONS

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 horizontal airflow automatically

during cooling or dehumidifying.

Air Intake

Intakes air from room.

● Indoor Unit

● Wired remote controller

PAR-21MAA

ON/OFF

FILTER

CHECK

OPERATION

CLEAR

TEST

TEMP.

BACK DAY

MONITOR/SET

CLOCK

ON/OFF

Operation Section

Temperature setting buttons

Down

Timer Menu button

(Monitor/Set button)

Mode button (Return button)

Set Time buttons

Back

Ahead

Timer On/Off button

(Set Day button)

Opening the

lid

ON/OFF button

Fan Speed button

Filter button

(<Enter> button)

Test Run button

Check button (Clear button)

Airflow Up/Down button

Louver button

( Operation button)

To return operation

number

Ventilation button

( Operation button)

To go to next operation

number

Built-in temperature sensor

OC370B--1.qxp 07.6.20 2:42 PM Page 5

● Wired remote controller

●

˚F˚C

ERROR CODE

AFTER

TIMER

TIME SUN MON TUE WED THU FRI SAT

OFF

AFTER

FILTER

FUNCTION

ONLY1Hr.

WEEKLY

SIMPLE

AUTO OFF

Note:

“PLEASE WAIT” message

This message is displayed for approximately 3 minutes when power is supplied to the indoor unit or when the unit is recovering from a power failure.

“NOTAVAILABLE” message

This message is displayed if an invalid button is pressed (to operate a function that the indoor unit does not have).

If a single remote controller is used to operate multiple indoor units simultaneously that are different types, this message will not be displayed as

far as any of the indoor units is equipped with the function.

Display Section

For purposes of this explanation,

all parts of the display are shown

as lit. During actual operation, only

the relevant items will be lit.

Identifies the current operation

Shows the operating mode, etc.

*Multilanguage display is available.

“Centrally Controlled” indicator

Indicates that operation from the

remote controller has been prohib-

ited by a master controller.

“Timer is Off” indicator

Indicates that the timer is off.

Temperature Setting

Shows the target temperature.

Day-of-Week

Shows the current day of the week.

Time/Timer Display

Shows the current time, unless the simple or Auto Off

timer is set.

If the simple or Auto Off timer is set, the time to be

switched off is shown.

“Sensor” indication

Displayed when the remote controller

sensor is used.

“Locked” indicator

Indicates that remote controller but-

tons have been locked.

“Clean The Filter” indicator

To be displayed on when it is time to

clean the filter.

Timer indicators

The indicator comes on if the corre-

sponding timer is set.

Up/Down Air Direction indica-

tor

Shows the direction of the

outcoming airflow.

“One Hour Only” indicator

Room Temperature display

Shows the room temperature. The room

temperature display range is 46–102

The display blinks if the temperature

is less than 46

or 102

or more.

Louver display

Indicates the action of the swing louver.

Does not appear if the louver is not

running.

(Power On indicator)

Indicates that the power is on.

Fan Speed indicator

Shows the selected fan speed.

Ventilation indicator

Appears when the unit is running in

Ventilation mode.

Displayed if the airflow is set to

Low or downward during COOL

or DRY mode. (Operation varies

according to model.)

The indicator goes off in one hour,

at which time the airflow direction

also changes.

OC370B--1.qxp 07.6.20 2:42 PM Page 6

ON/OFF TEMP

FAN

VANE

TEST RUN

AUTO STOP

AUTO START

min

LOUVER

MODE

CHECK

RESETSET CLOCK

MODEL

SELECT

NOT AVAILABLE

SWING

CHECK

FAN

TEST

RUN

˚F

˚C

AMPMSTOP

START

AMPM

COOL

DRY

AUTO

FAN

HEAT

VANE CONTROL button

Changes 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

Changes left / right airflow direction.

(Not available for this model.)

MODE SELECT button

Switches the operation mode between

COOLING/DRY/FAN/HEATING and AUTO

mode.

wIn case the outdoor unit is cooling only

type, the heating and auto mode are not

available.

CHECK-TEST RUN button

Performs an inspection check or test opera-

tion.

Do not use it for normal operation.

FAN SPEED SELECT button

Changes the fan speed.

TIMER display

Displays when in timer operation or when

setting timer.

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

Temperature setting display

indicates the desired temperature setting

which is set.

display

Displays selected fan speed.

display

The vertical direction of air flow is indicated.

display

Blinks when model is selected.

display

Lights up while the signal is transmitted to

the indoor unit when the button is pressed.

display

Indicate that the unit is being checked or

test-run.

OPERATION MODE display

Indicates which operation 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

OC370B--1.qxp 07.6.20 2:42 PM Page 7

Single phase,60Hz, 208/230V

Munsell 0.70Y 8.59/0.97

Plate fin coil

Turbo fan (direct) o1

0.070

0.79

Dry: 15-16-18-20(530-570-640-710)

Wet:14-15-17-19(490-530-600-670)

0(direct blow)

–

Remote controller & built-in

28-30-32-34

32 (1-1/4)

PLA-A18AA/ PLA-A18AA

UNIT : 840 (33-1/16) PANEL: 950 (37-3/8)

UNIT : 258 (10-3/16) PANEL: 30 (1-3/16)

UNIT : 24 (53) PANEL: 5 (11)

F.L.A.

K/min(CFM)

Pa(mmAq)

mm(in.)

kg(lbs)

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

INDOOR UNIT

Single phase,60Hz, 208/230V

Munsell 0.70Y 8.59/0.97

Plate fin coil

Turbo fan (direct) o1

0.070

0.79

Dry: 11-12-13-14(390-420-460-490)

Wet: 10-11-12-13(350-380-420-450)

0(direct blow)

–

Remote controller & built-in

27-28-29-31

32 (1-1/4)

F.L.A.

K/min(CFM)

Pa(mmAq)

mm(in.)

kg(lbs)

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

INDOOR UNIT

PLA-A12AA/ PLA-A12AA1

UNIT : 840 (33-1/16) PANEL: 950 (37-3/8)

UNIT : 258 (10-3/16) PANEL: 30 (1-3/16)

UNIT : 22 (49) PANEL: 5 (11)

SPECIFICATIONS

PLA-A24AA/ PLA-A24AA1

UNIT : 840 (33-1/16) PANEL: 950 (37-3/8)

UNIT : 258 (10-3/16) PANEL: 30 (1-3/16)

UNIT : 24 (53) PANEL: 5 (11)

Single phase,60Hz, 208/230V

Munsell 0.70Y 8.59/0.97

Plate fin coil

Turbo fan (direct) o1

0.070

0.79

Dry: 15-16-18-20(530-570-640-710)

Wet: 14-15-17-19(490-530-600-670)

0(direct blow)

–

Remote controller & built-in

28-30-32-34

32(1-1/4)

F.L.A.

K/min(CFM)

Pa(mmAq)

mm(in.)

kg(lbs)

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

INDOOR UNIT

OC370B--1.qxp 07.6.20 2:42 PM Page 8

UNIT : 840 (33-1/16) PANEL : 950 (37-3/8)

UNIT : 298 (11-3/4) PANEL : 30 (1-3/16)

UNIT : 30 (66) PANEL : 5 (11)

PLA-A36AA/ PLA-A36AA1

Single phase,60Hz, 208/230V

Munsell 0.70Y 8.59/0.97

Plate fin coil

Turbo fan (direct) o1

0.110

1.25

Dry: 20-23-26-28(710-810-920-990)

Wet: 19-22-25-27(670-770-880-950)

0(direct blow)

–

Remote controller & built-in

33-36-39-41

32(1-1/4)

F.L.A.

K/min(CFM)

Pa(mmAq)

mm(in.)

kg(lbs)

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

INDOOR UNIT

PLA-A30AA/ PLA-A30AA1

UNIT : 840 (33-1/16) PANEL: 950 (37-3/8)

UNIT : 258 (10-3/16) PANEL: 30 (1-3/16)

UNIT : 24 (53) PANEL: 5 (11)

Single phase,60Hz, 208/230V

Munsell 0.70Y 8.59/0.97

Plate fin coil

Turbo fan (direct) o1

0.070

0.79

Dry: 15-16-18-20(530-570-640-710)

Wet: 14-15-17-19(490-530-600-670)

0(direct blow)

–

Remote controller & built-in

28-30-32-34

32(1-1/4)

F.L.A.

K/min(CFM)

Pa(mmAq)

mm(in.)

kg(lbs)

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

INDOOR UNIT

UNIT : 840 (33-1/16) PANEL : 950 (37-3/8)

UNIT : 298 (11-3/4) PANEL : 30 (1-3/16)

UNIT : 30 (66) PANEL : 5 (11)

PLA-A42AA/ PLA-A42AA1

Single phase,60Hz, 208/230V

Munsell 0.70Y 8.59/0.97

Plate fin coil

Turbo fan (direct) o1

0.110

1.25

Dry: 20-23-26-28(710-810-920-990)

Wet: 19-22-25-27(670-770-880-950)

0(direct blow)

–

Remote controller & built-in

33-36-39-41

32(1-1/4)

F.L.A.

K/min(CFM)

Pa(mmAq)

mm(in.)

kg(lbs)

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

INDOOR UNIT

OC370B--1.qxp 07.6.20 2:42 PM Page 9

6NOISE CRITERION CURVES

PLA-A12AA

PLA-A12AA1

NOTCH SPL(dB) LINE

High

Medium1

Medium2

Low

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 µbar)

BAND CENTER FREQUENCIES, Hz

PLA-A36AA

PLA-A42AA

PLA-A36AA1

PLA-A42AA1

NOTCH SPL(dB) LINE

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

High

Medium1

Medium2

Low

OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)

PLA-A18AA PLA-A18AA

PLA-A24AA PLA-A24AA

PLA-A30AA PLA-A30AA

NOTCH SPL(dB) LINE

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

High

Medium1

Medium2

Low

OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)

UNIT

5 ft

MICROPHONE

CEILING

OC370B--1.qxp 07.6.20 2:42 PM Page 10

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