Mitsubishi PUHZ-W112VHA, PUHZ-W112VHA-BS Service Manual

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SERVICE MANUAL

AIR TO WATER HEAT PUMP

No. OCH562

CONTENTS

1. SAFETY PRECAUTION

...................................

2. SPECIFICATIONS

............................................

3. DATA

...............................................................

4. OUTLINES AND DIMENSIONS

.......................

5. WIRING DIAGRAM

........................................

6. WIRING SPECIFICATIONS

............................

7. REFRIGERANT SYSTEM DIAGRAM

...............

8. TROUBLESHOOTING

...................................

9. DISASSEMBLY PROCEDURE

......................

June 2014

Note:

• This manual describes service

data of outdoor unit only.

R410A

[Model Name]

PUHZ-W112VHA

Salt proof model

PUHZ-W112VHA-BS

PARTS CATALOG (OCB562)

[Service Ref.]

PUHZ-W112VHA

PUHZ-W112VHA-BS

Outdoor unit

SAFETY PRECAUTION

1-1. ALWAYS OBSERVE FOR SAFETY

Before obtaining access to terminal, all supply circuits must be disconnected.

Preparation before the repair service.

• Prepare the proper tools.

• Prepare the proper protectors.

• Provide adequate ventilation.

• After stopping the operation of the air conditioner, turn off the power-supply breaker.

• Discharge the condenser before the work involving the electric parts.

Precautions during the repair service.

• Do not perform the work involving the electric parts with wet hands.

• Do not pour water into the electric parts.

• Do not touch the refrigerant.

• Do not touch the hot or cold areas in the refrigerating cycle.

• When the repair or the inspection of the circuit needs to be done without turning off the power, exercise great caution not to touch the live parts.

Cautions for units utilizing refrigerant R410A

1-2. CAUTIONS RELATED TO NEW REFRIGERANT

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 refrigerant 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.

Handle tools with care.

If dirt, dust or moisture enters into refrigerant cycle, that can cause deterioration of refrigerant oil or malfunction of compressor.

Do not use a charging cylinder.

If a charging cylinder is used, the composition of refrigerant will change and the efficiency will be lowered.

Electronic refrigerant charging scale

Vacuum pump adaptor

Gauge manifold

Torque wrench

Gas leak detector

Charge hose

Tools for R410A

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.

OCH562

[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.

[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.)

Gravimeter

Unit

[3] Service tools

Use the below service tools as exclusive tools for R410A refrigerant.

No.

Tool name

Specifications

Gauge manifold

· Only for R410A

· Use the existing fitting

specifications

. (UNF1/2)

· Use high-tension side pressure of 5.3 MPa·G or over.

Charge hose

· Only for R410A

· Use pressure performance of 5.09 MPa·G or over.

Electronic scale

—

Gas leak detector · Use the detector for R134a, R407C or R410A.

Adaptor for reverse flow check · Attach on vacuum pump.

Refrigerant charge base

—

Refrigerant cylinder

· Only for R410A · Top of cylinder (Pink)

· Cylinder with syphon

Refrigerant recovery equipment

—

OCH562

Although "-BS" model has been designed to be resistant to salt damage, observe the following precautions to maintain the performance of the unit.

1. Avoid installing the unit in a location where it will be exposed directly to seawater or sea breeze.

2. If the cover panel may become covered with salt, be sure to install the unit in a location where the salt will be washed away by rainwater. (If a sunshade is installed, rainwater may not clean the panel.)

3. To ensure that water does not collect in the base of the outdoor unit, make sure that the base is level, not at angle. Water collecting in the base of the outdoor unit could cause rust.

4. If the unit is installed in a coastal area, clean the unit with water regularly to remove any salt build-up.

5. If the unit is damaged during installation or maintenance, be sure to repair it.

6. Be sure to check the condition of the unit regularly.

7. Be sure to install the unit in a location with good drainage.

1-4. PRECAUTIONS FOR SALT PROOF TYPE "-BS" MODEL

1-3. CAUTIONS FOR REFRIGERANT PIPING WORK

Tools for R410A (The following table shows whether conventional tools can be used or not.)

Gauge manifold Charge hose Gas leak detector

Refrigerant recovery equipment Refrigerant cylinder Safety charger

Charge valve

Vacuum pump

Bender Pipe cutter Welder and nitrogen gas cylinder Refrigerant charging scale Vacuum gauge or thermistor vacuum gauge and vacuum valve Charging cylinder

Air purge, refrigerant charge and operation check Gas leak check Refrigerant recovery Refrigerant charge Prevent compressor malfunction

when charging refrigerant by spraying liquid refrigerant

Prevent gas from blowing out when detaching charge hose

Vacuum drying and air purge

Bend the pipes Cut the pipes Weld the pipes Charge refrigerant Check the degree of vacuum. (Vacuum valve prevents back flow of oil and refrigerant to thermistor vacuum gauge) Refrigerant charge

Tool exclusive for R410A Tool exclusive for R410A Tool for HFC refrigerant Tool exclusive for R410A Tool exclusive for R410A Tool exclusive for R410A

Tool exclusive for R410A

Tools for other refrigerants can be used if equipped with adapter for reverse flow check Tools for other refrigerants can be used Tools for other refrigerants can be used Tools for other refrigerants can be used Tools for other refrigerants can be used Tools for other refrigerants can be used

Tool exclusive for R410A

Tools and materials Use R410A tools Can R22 tools be used?

(Usable if equipped with adapter for rever se flow)

Can R407C tools be used?

(Usable if equipped with adapter for rever se flow)

: Prepare a new tool. (Use the new tool as the tool exclusive for R410A.) : Tools for other refrigerants can be used under certain conditions. : Tools for other refrigerants can be used.

OCH562

PUHZ-W112VHA(-BS)

noitidnoc gnitarepo lanimoN)ycneuqerF ,egatloV ,esahP( ylppus rewoP

Nominal water flow rate (Heating mode) L/min

Heating(A7/W35)

Heating

7 +)blub-yrD( erutarepmet ria edistuOWkyticapaC ℃

(A7/W35)

6 +)blub-teW( erutarepmet ria edistuOPOC ℃

53+/03+)teltuo/telni( erutarepmet retaWWktupni rewoP ℃

Heating

WkyticapaC

Heating(A2/W35)

(A2/W35)

2 +)blub-yrD( erutarepmet ria edistuOPOC ℃ 1 +)blub-teW( erutarepmet ria edistuOWktupni rewoP ℃

essure diffe

rence (water circuit) 　 )teltuo/telni( erutarepmet retaWaPk －/+35℃

Heating pump input (based on EN14511) kW

Cooling(A35/W7)

53+)blub-yrD( erutarepmet ria edistuOnim/L)edom gnilooC( etar wolf retaw lanimoN ℃

Cooling

42 +)blub-teW( erutarepmet ria edistuOWkyticapaC ℃

(A35/W7)

7+/21+)teltuo/telni( erutarepmet retaW)POC( REE ℃

Power input kW

Cooling(A35/W18)

Cooling

53+)blub-yrD( erutarepmet ria edistuOWkyticapaC ℃

(A35/W18)

42 +)blub-teW( erutarepmet

ria edistuO)POC( REE ℃

81+/32+)teltuo/telni( erutarepmet retaWWktupni rewoP ℃

Pressur

difference (water circuit) 　kPa

Cooling pump input (based on EN14511) kW

Note: "COP" and "Power input" in the above table are values that contains the "pump input (based on EN 14511) ".

regnahcxe taeh etalPsnoitacificeps tinu roodtuO

Model name

MITSUBISHI

Running current Heating

(A7/W35)

Cooling

(A35/W7)

Power factor Heating

(A7/W35)

Cooling

(A35/W7)

mm05:A %

mm664:B Atnerruc .xaM

Breaker size

MWA2-46LM

29.5

0.01

11.20

0.01

3.34

3.35

6.3

15.8 98 98

11.1

1φ, 230V, 50Hz

2.80

2.22

11.20

4.47

3.57

2.51

32.1

28.7

10.00

4.50

PUHZ-W112VHA(-BS)

Water OUT

Ref. IN

(Heating)

mm801:W gnisac retuO mm225:H hsinif lanretxE mm231:D lortnoc tnaregirfeR

setalp 64rosserpmoC Model Motor output kW Start type

erutarepmet retaw teltuo mumixaMsecived noitcetorP

Oil (Model) L

Wretaeh esacknarC

Heat exchanger Air

Water

.oN×)evird(naFnaF

Fan motor output

Air flow

/min

(CFM) Defrost method Noise level (SPL) Heating dB

Cooling dB

Dimensions Width mm (in)

Depth mm (in) Height mm (in)

)bl( gkthgieW

Refrigerant

Quantity kg (lb)

Guaranteed operating Heating

℃

range (Outdoor) Cooling

℃

Outl

et water temp. Heat

ing

℃

(Max in heating, Min in cooling)

Cooling

℃

Return water Heating

℃

R410A

(3,530)

Reverse cycle

Propeller fan × 2

0.074 x 2

133

1020 (40-3/16)

330 +30

(13+1-3/16)

1350 (53-1/8)

Galvanized plate

*2 *3

2.5

4.0 (8.8)

-20

～ +35

-5

～ +46

～ +59

+60

ANB33FNMMT

100

Plate fin coil

Plate heat exchanger

Comp.surface thermo

900 (FV50S)

Inverter

HP switch/LP switch

Discharge thermo

Hermetic scroll

Linear expansion valve

Munsell 3Y 7.8/1.1

Water IN

Ref. OUT (Heating)

Thermistor

(TH32)

*1 Hot gas with four-way valve *2 at distance of 1m from outdoor unit *3 A weighted sound power level in accordance

with ISO9614-1 for EN14511 testing is

69 dBA.

*4 grill *5 Lower limit of use is -5℃ for EN14511 testing

purposes.

*6 With the optional air outlet guide, min. operation

temperature will be -15℃.

temperature range Cooling

℃

1.23~4.41nim/Legnar etar wolf retaW

+8 ～ +28

7 Lowest entering temperature is 12

℃

for EN14511

testing purposes.

-20 -15 -10 -5 0 5 10

Maximum outlet water temperature [℃]

SPECIFICATIONS

2-1. SPECIFICATIONS

OCH562

2-2. AVAILABLE RANGE (WATER FLOW RATE, RETURN WATER TEMP.)

Note: If using the unit out of the available range, the parts of unit might be damaged.

14.0 19.0 24.0 29.0 34.0 39.0

Table 3

Water flow rate [L/min]

5.0

7.0

9.0

11.0

13.0

15.0

17.0

19.0

21.0

23.0

25.0

Return water temp [:]

• PUHZ-W112VHA(-BS)

Available range

14.0 19.0 24.0

29.0

34.0 39.0

Table 6

Water flow rate [L/min]

5.0

7.0

9.0

11.0

13.0

15.0

Return water temp [:]

• PUHZ-W112VHA(-BS)

17.0

Available range

OCH562

DATA

1.5m

MICROPHONE

UNIT

GROUND

3-1. NOISE CRITERION CURVES

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

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

63 125 250 500 1000 2000 4000 8000

APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE

BAND CENTER FREQUENCIES, Hz

COOLING

MODE

HEATING

SPL(dB)

LINE

PUHZ-W112VHA PUHZ-W112VHA-BS

OCH562

3-2. STANDARD OPERATION DATA

Mode

Cooling (A35/W7) Heating (A7/W35)

Total

Capacity W 10,000 11,200

Input kW 3.57 2.51

Electrical circuit

Outdoor unit

PUHZ-W112VHA

Phase, Hz 1, 50

Voltage V 230

Current A 15.8 11.1

Refrigerant circuit

Discharge pressure MPa 2.63 2.08

Suction pressure MPa 0.83 0.67

Discharge temperature ºC 69 60

Condensing temperature

ºC 45 36

Suction temperature ºC 9 6

Water

conditions

Flow volume L/min 28.7 32.1

Outlet water temperature

ºC 7 35

Outdoor

conditions

Intake air temperature

D.B. ºC 35 7

W.B. ºC 24 6

The unit of pressure has been changed to MPa based on international SI system. The conversion factor is: 1 (MPa) = 10.2 (kgf/cm

)

OCH562

PUHZ-W112VHA PUHZ-W112VHA-BS

Rear Air Intake

2-12×36 oval holes

(Foundation Bolt M10)

2-U Shaped notched holes

(Foundfation Bolt M10)

Installation Feet

Side Air Intake

Air Discharge

30 330

210 600 210

370 19

417

Handle for moving

Service panel

Terminal connections

Left···Power supply wiring

Right···Controller wiring

Earth terminal

Handle for moving

1020

322

1350

1079

371

635

Power supply

wiring hole

(2-

{27Knock Out)

Front cover

see Detail

Air Intake

4074

Handle for moving

Rear Air Intake

Handle for moving

Water OUT

Water IN

Handle for moving

Side Air Intake

Detail

Scale 1:6

ISO 228-1

G1 B

46674

Drain hole

(5-

{33)

21981

30 256

133 133 133

FOUNDATION

Please secure the unit firmly

with 4 foundation (M10) bolts.

(Bolts and washers must be

purchased locally.)

Service space

Dimensions of space needed

for service access are

shown in the below diagram.

Over 300

500

Over 10

FREE

Over 300mm

Over 10mm

The diagram below shows a

basic example.

Explantion of particular details are

given in the installation manuals etc.

Over 10mm

1 FREE SPACE (Around the unit)

2 SERVICE SPACE

3 FOUNDATION BOLTS

Less than

Over

Over 500mm

Unit: mm

OUTLINES AND DIMENSIONS

OCH562

PUHZ-W112VHA PUHZ-W112VHA-BS

1 2 3 4 5 6 7 8

OFF

112V

MODEL

SW6

1 MODEL SELECT

2. SW5 -1 to 5 : Function Switch

SW5-6 *2

OFF

1 2 3 4 5 6

The black square ( )indicates a switch position.

TB1 MC MF1, MF2 21S4 63H

TH3 TH4

TH7

LEV-A, LEV-B DCL

Terminal Block <Power Supply, Indoor/Outdoor> Motor for Compressor Fan Motor Solenoid Valve (Four-Way Valve)

High Pressure Switch 63L Low Pressure Switch 63HS

High Pressure Sensor

Thermistor <Liquid

Thermistor <Discharge

TH6 Thermistor <Plate HEX Liquid

Thermistor <Ambient

TH33 Thermistor <Suction

TH32 Thermistor

Inlet Water

Linear Expansion Valve

Reactor

CB Main Smoothing Capacitor CY1, CY2 Capacitor

Power Module

Controller Circuit Board

Connector

Emergency Operation

Connector <Connection

for Option

Switch <Manual Defrost, Defect History, Record Reset, Function Switch

Switch <Function Switch

Switch <Function Switch, Model Select

SW1

Connector <Connection for Option

CN51

CNDM

SW2

SW6

Switch <Function Switch

SW8

Switch <Function Switch

SW7

SV1

LED3

LED <Operation/Inspection Indicators

C. B.

SYMBOL NAME SYMBOL NAME

Connection Terminal <N-Phase

Connection Terminal <Reactor

Connection Terminal <Ground

DCL1, DCL2 IGBT EI, E2, E3, E4

Power Circuit Board

Connection Terminal

U/V/W-Phase

P. B.

Connection Terminal <L-Phase

U, V, W

Switch <Model Select

SW5

CN31

Relay

Fuse

T6.3AL250V

F1, F2, F3, F4 X51, X52, X54

TH8 Thermistor(internal)

Heat Sink

Thermistor <Comp. Surface

TH34

Switch

Function Switch

SW9

MS 3

MF1

1 1 2 1

1 7

CNF1

(WHT)

TRANS

MS 3

MF2

CNF2

(WHT)

CNDC

(PNK)

TH7/6

(

RED

)

TH3

(WHT)

TH4

(WHT)

TH7

t° t° t° t°

TH6 TH3 TH4

1 2

TH32

(

BLK

)

t°

TH32

1 3

TH33

(

YLW

)

t°

TH33

63HS

(WHT)

CNS

(WHT)

63H

(

YLW

)

CN52C

(RED)

63H

63L

(

RED

)

63L

C. B.

IGBT

LED3

CN2

(WHT)

1 2

1 31 3

CNAC

(WHT)

CN4

(WHT)

21S4

(GRN)

X52

X54

1 3

(WHT)

SV1

(

GRY

)

X51

21S4

CN51

(WHT)

CNDM

(WHT)

DCL2

MS 3~

CN2

(WHT)

CN4

(WHT)

CNDC

(

PNK

)

BLK

WHT

CY1 CY2

LINI

POWER SUPPLY ~/N 230V 50Hz

Interface unit / Flow temp. controller

TB1

L N S1 S2 S3

RED

CNAC1

(WHT)

CNAC2

(RED)

CN52C

(RED)

52C

BLU

YLW

GRN/YLW

ORN

BRN

RED

WHT

RED

BLK

DCL1

DCL

t°

TH8

P. B.

SW9SW2

M M

51 1

LEV-A (WHT)

LEV-B

(RED)

LEV-BLEV-A

TH34

(RED)

t°

TH34

1 3

CNVMNT

(WHT)

CNMNT

(WHT)

SW5SW8

SW7

SW6SW1

CN31

5 WIRING DIAGRAM

OCH562

WIRING SPECIFICATIONS6

FIELD ELECTRICAL WIRING (power wiring specifications)

Caution: Be sure to install N-line. Without N-line, it could cause damage to the unit.

Notes: 1. Wiring size must comply with the applicable local and national codes.

Power supply cables and the cables between Controller and Outdoor unit shall not be lighter than polychloroprene sheathed

exible cables. (Design 60245 IEC 57

)

3. Be sure to connect the cables between Controller and Outdoor unit directly to the units (no intermediate connections are allowed).

Intermediate connections may result in communication errors. If water enters at the intermediate connection point, it may

cause insufcient insulation to ground or a poor electrical contact .

(If an intermediate connection is necessary, be sure to take measures to prevent water from entering the cables.)

4. Install an earth longer than other cables.

ledom tinu roodtuO 112V

Outdoor unit power supply

~/N (single), 50 Hz, 230 V

32A1*yticapac rekaerB tiucriC tinu roodtuO

Wiring

Wire No. ×

size (mm²)

6 .niM × 3htrae ,ylppus rewop tinu roodtuO

Interface unit/Flow temp. controller-Outdoor unit *2 3 × 1.5 (polar)

Interface unit/Flow temp. controller-Outdoor unit earth *2 1 × Min. 1.5

Remote controller-Interface unit/Flow temp. controller 2 × 0.3 (Non-polar)

Circuit rating

Outdoor unit L-N (single) Outdoor unit L1-N, L2-N, L3-N (3phase)

*3 AC 230 V

Interface unit/Flow temp. controller-Outdoor unit S1-S2 *3 AC 230 V

Interface unit/Flow temp. controller-Outdoor unit S2-S3 *3 DC 24 V

Remote controller-Interface unit/Flow temp. controller *3 DC 12 V

*1. A breaker with at least 3.0 mm contact separation in each pole shall be provided. Use earth leakage breaker (NV).

*2. Max. 80 m *3.The figures are NOT always against the ground. S3 terminal has DC 24 V against S2 terminal. However between S3 and S1, these terminals are NOT

electrically insulated by the transformer or other device.

Make sure that the current leakage breaker is one compatible with higher harmonics. Always use a current leakage breaker that is compatible with higher harmonics as this unit is equipped with an inverter. The use of an inadequate breaker can cause the incorrect operation of inverter.

Warning:

In case of A-control wiring, there is high voltage potential on the S3 terminal caused by electrical circuit design that has no electrical insulation between power line and communication signal line. Therefore, please turn off the main power supply when servicing. And do not touch the S1, S2, S3 terminals when the power is energized. If isolator should be used between Interface unit/ Flow temp. controller and outdoor unit, please use 3-pole type.

A-Control

Outdoor Unit

3 poles isolator

Power supply

Isolator

Interface unit/ Flow temp. controller

OCH562

REFRIGERANT SYSTEM DIAGRAM7

Distributor

TH7

Strainer(#100)

Receiver

Power

LEV-B

TH6

TH32

Plate HEX

Water IN

Water OUT

Strainer (#100)

TH3

STOP VALVE

CHECK/V

H/P SW

L/P SW

TH4TH33

TH34

TH8 P/B

LEV-A

COMP

REV/V

P-Sensor

Strainer (#100)

MUFFLER

Refrigerant flow in heating

Refrigerant flow in cooling

COMP

H/P SW

L/P SW

Plate HEX

REV/V

STOP VALVE

CHECK/V

P-Sensor

P/B

LEV-A

LEV-B

TH33

TH32

TH3

TH4

TH6

TH7

TH8

TH34

Power Receiver

DC inverter scroll compressor (Mitsubishi Electric Corporation)

For protection (OFF:4.15MPa)

For protection (OFF:-0.03MPa)

MWA2-46LM (MITSUBISHI)

Change the refrigerant circuit (Heating / Cooling) and for Defrosting

For refrigerant charge

High pressure / Low pressure / For production test use

For calculation of the condensing temperature from high pressure

Inverter power board

Heating:Secondary LEV Cool

ing:Primary LEV

Heating:Primary LEV Cooling:Second

ary LEV

For LEV control

For freeze protection and for compressor frequency control

Heating:Evaporating temperature Cooling:Sub cool liquid temperature

For LEV control and for compressor protection

Heating:Sub cool liquid temperature Cooling:Evaporating temperature

For fan control and for compressor frequency control

For power board protection

For compressor protection

For accumulat

ion of refrigerant

Compressor

gh pressure switch (63H)

Low pressure switch (63L)

Plate Heat Exchanger

Reversing (4-way) valve (21S4)

Stop valve

Check valve

Pressure sensor (63HS)

Power board

Linear expansion valve -A

Linear expansion valve -B

Suction temperature thermistor

Inlet water temperature thermistor

Liquid temperature thermistor

Discharge temperature thermistor

Plate HEX liquid temperature thermistor

Ambient temperature thermistor

Heatsink temperature thermistor

Comp. surface temperature thermistor

Power Rece

iver

Symbol Part name

Detail

PUHZ-W112VHA PUHZ-W112VHA-BS

OCH562

TROUBLESHOOTING8

Present and past check codes are logged and displayed on the control board of outdoor unit. Actions to be taken for service, which depends on whether or not the trouble is reoccurring at service, are summarized in the table below. Check the contents below before investigating details.

8-1. TROUBLESHOOTING

8-2. CHECK POINT UNDER TEST RUN

Before test run

• After installation of outdoor units, piping work and electric wiring work, re-check that there is no water leakage, loosened

connections and incorrect polarity.

• Measure impedance between the ground and the power supply terminal block (L, N) on the outdoor unit by 500 V Megger

and check that it is 1.0 M

or over.

• Turn on power supply 12 hours before test run in order to protect compressor.

• Make sure to read operation manual before test run. (Especially items to secure safety.)

Unit conditions at service Check code Actions to be taken for service (summary)

The trouble is reoccurring.

Displayed

Judge what is wrong and take a corrective action according to “8-3. SELF-DIAGNOSIS ACTION TABLE”.

Not displayed

Conduct troubleshooting and ascertain the cause of the trouble.

The trouble is not reoccurring.

Logged

Consider 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.

Reset check code logs and restart the unit after nishing

service.

There is no abnormality in electrical component,

controller board, etc.

Not logged

Re-check the abnormal symptom.

Conduct troubleshooting and ascertain the cause of the

trouble.

Continue to operate unit for the time being if the cause

is not ascertained.

There is no abnormality concerning of parts such as

electrical component, controller board, etc.

OCH562

8-3. SELF-DIAGNOSIS ACTION TABLE

Check code

Abnormal point and detection method

Case

Judgment and action

None —

63L connector open

Abnormal if 63L connector circuit is open for 3 minutes continuously from being switched on. 63L: Low-pressure switch

1 Disconnection or contact failure

of 63L connector on outdoor controller circuit board

2 Disconnection or contact failure

of 63L

3 63L is working due to refriger-

ant leakage or defective parts.

4 Defective outdoor controller

circuit board

1 Check connection of 63L connector on

outdoor controller circuit board.

Refer to "8-6. TEST POINT DIAGRAM".

2 Check the 63L side of connecting wire.

3 Check refrigerant pressure.

Charge additional refrigerant. Check continuity of 63L. Replace low pressure switch if it is defective.

4 Replace outdoor controller circuit board.

No voltage is supplied to terminal block (TB1) of outdoor unit.

a) Power supply breaker is

turned off.

b) Contact failure or

disconnection of power supply terminal

c) Open phase (L or N phase)

2 Electric power is not charged

to power supply terminal of outdoor power circuit board.

a) Contact failure of power

supply terminal

b) Open phase on the outdoor

power circuit board Disconnection of connector LI, NI

3 Electric power is not supplied

to outdoor controller circuit board.

a) Disconnection of connector

(CNDC)

4 Disconnection of reactor (DCL)

5 Defective outdoor power circuit

board

6 Defective outdoor controller

circuit board

1 Check following items.

a) Power supply breaker

b) Connection of power supply terminal

block. (TB1)

c) Connection of power supply terminal

block. (TB1)

2 Check following items.

a) Connection of power supply terminal block.

(TB1)

b) Connection of terminal on outdoor power

circuit board.

Check connection of the connector LI or NI. Refer to "8-6. TEST POINT DIAGRAM".

3 Check connection of the connector CNDC on

the outdoor controller circuit board. Check connection of the connector CNDC on the outdoor power circuit board.

Refer to "8-6.

TEST POINT DIAGRAM".

4 Check connection of reactor. (DCL) Check connection of "DCL1" and "DCL2" on

the outdoor power circuit board.

5 Replace outdoor power circuit board.

6 Replace outdoor controller circuit board

(When items above are checked but the units can not be repaired.)

2 connector open

Abnormal if both 63H and 63L connector circuits are open for 3 minutes continuously from being switched on.

63H: High-pressure switch 63L: Low-pressure switch

1 Disconnection or contact failure

of connector (63H,63L) on outdoor controller circuit board.

2 Disconnection or contact failure

of 63H, 63L

3 63H and 63L are working due

to defective parts.

4 Defective outdoor controller

board.

1 Check connection of connector (63H,63L) on

outdoor controller circuit board.

Refer to "8-6. TEST POINT DIAGRAM". 2 Check the 63H and 63L side of connecting

wire.

3 Check continuity of 63H and 63L. Replace the pressure switch if it is defective. 4 Replace outdoor controller circuit board.

63H connector open

Abnormal if 63H connector circuit is open for 3 minutes continuously from being switched on. 63H: High-pressure switch

1 Disconnection or contact failure

of 63H connector on outdoor controller circuit board

2 Disconnection or contact failure

of 63H

3 63H is working due to defective

parts.

4 Defective outdoor controller

circuit board

1 Check connection of 63H connector on

outdoor controller circuit board.

Refer to "8-6. TEST POINT DIAGRAM".

2 Check the 63H side of connecting wire.

3 Check for continuity of 63H.

Replace high pressure switch if it is defective. 4 Replace outdoor controller circuit board.

OCH562

Check code

Abnormal point and detection method

Judgment and action

Case

Miswiring of Interface unit/Flow temp. controller-outdoor unit connecting wire (converse wiring or disconnection)

Outdoor controller circuit board can automatically set the unit number of Interface unit/Flow temp. controller.

Abnormal if the Interface unit/Flow temp. controller number cannot be set within 4 minutes after power on because of miswiring (converse wiring or disconnection) of Interface unit/Flow temp. controller-outdoor unit connecting wire.

Start-up time over

The unit cannot finish start-up process within 4 minutes after power on.

Contact failure of Interface unit

/Flow temp. controller-outdoor

unit connecting wire

Diameter or length of Interface

unit/Flow temp. controlleroutdoor unit connecting wire is out of specified capacity.

Noise has entered into power

supply or Interface unit/Flow temp. controller-outdoor unit connecting wire.

Contact failure or miswiring

of Interface unit/Flow temp. controller-outdoor unit connecting wire

Diameter or length of Interface

unit/Flow temp. controlleroutdoor unit connecting wire is out of specified capacity.

Defective transmitting receiving

circuit of outdoor controller circuit board

Defective transmitting receiving

circuit of Interface/Flow temp. controller board

Noise has entered into power

supply or Interface unit/Flow temp. controller-outdoor unit connecting wire.

Miswiring of Interface unit/Flow temp. controller-outdoor unit connecting wire

1. Outdoor controller circuit board can automatically check the number of connected Interface unit/Flow temp. con-

troller. Abnormal if the number cannot be checked automatically due to miswiring of Interface unit/Flow temp. controlleroutdoor unit connecting wire and etc. after power is turned on for 4 minutes.

2. Abnormal if outdoor controller circuit board recognizes excessive number of Interface unit/Flow temp. controller.

Check disconnection or looseness or polarity

of Interface unit/Flow temp. controller-outdoor unit connecting wire of Interface unit/Flow temp. controller and outdoor units.

Check diameter and length of Interface unit/

Flow temp. controller-outdoor unit connecting

wire. Total wiring length: 80 m (Including wiring connecting each Interface

unit/Flow temp. controller unit and between

Interface unit/Flow temp. controller and out-

door unit) Also check if the connection order of flat

cable is S1, S2, S3.

Check the number of Interface unit/Flow

temp. controller that is connected to 1 out-

door unit. (If EA is detected.)

~ Turn the power off once, and on again to

check. Replace outdoor controller circuit board or Interface/Flow temp. controller board if abnormality occurs again.

Check transmission path, and remove the

cause.

Note:

The descriptions above, - , are for EA, Eb

and EC.

Contact failure or miswiring

of Interface unit/Flow temp. controller-outdoor unit connecting wire

Diameter or length of Interface

unit/Flow temp. controlleroutdoor unit connecting wire is out of specified capacity.

Excessive number of Interface

unit/Flow temp. controller is connected to 1 outdoor unit.

(2 units or more)

Defective transmitting receiving

circuit of outdoor controller

circuit board

Defective transmitting receiving

circuit of Interface/Flow temp. controller board

Noise has entered into power

supply or Interface/Flow

temp. controller-outdoor unit connecting wire.

OCH562

Check code

Abnormal point and detection method

Judgment and action

High pressure (High-pressure switch 63H operated)

Abnormal if high-pressure switch 63H operated ( * ) during compressor operation. *4.15 MPa

63H: High-pressure switch

1 Decreased water flow 2 Clogged filter of water pipe 3 Dirt of plate heat exchanger 4 Locked water pump 5 Malfunction of water pump 6 Clogged or broken pipe 7 Locked outdoor fan motor 8 Malfunction of outdoor fan

motor

9 Short cycle of outdoor unit

0 Dirt of outdoor heat exchanger 1 Decreased airflow caused by

defective inspection of outside temperature thermistor

(It detects lower temperature

than actual temperature.)

2 Disconnection or contact failure

of connector (63H) on outdoor controller board

3 Disconnection or contact failure

of 63H connection

4 Defective outdoor controller

board

5 Defective operation of linear

expansion valve

6 Malfunction of fan driving circuit

1~5 Check water circuit and repair the defect.

6 Check piping and repair the defect. 7~0 Check outdoor unit and repair the defect.

1 Check the detected temperature of outside

temperature thermistor on LED display.

(SW2: Refer to "

8-7.OUTDOOR UNIT

OPERATION MONITOR FUNCTION".)

2~4 Turn the power off and check F5 is

displayed when the power is turned on again.

When F5 is displayed, refer to “Judgment

and action” for F5.

5 Check linear expansion valve. Refer to "8-5.HOW TO CHECK THE

COMPONENTS".

6 Replace outdoor controller board.

Case

High discharging temperature

Abnormal if discharge temperature thermistor (TH4) exceeds 125: or 110: continuously for 5 minutes. Abnormal if during defrosting discharge temperature thermistor (TH4) exceeds 110 : continuously for 30 minutes.

High comp. surface temperature

Abnormal if comp. surface temperature (TH34) exceeds 170:. In the case of high comp. surface temperature error, compressor does not restart unless the thermistor (TH34) becomes less than 95:.

1 Overheated compressor

operation caused by insufficient refrigerant

2 Defective thermistor 3 Defective outdoor controller

board

4 Defective operation of linear

expansion valve

5 In the case of the unit does not

restart :

Detection temp. of thermistor

(TH34) ] 95:

1 Check intake super heat. Check leakage of refrigerant. Charge additional refrigerant. 23 Turn the power off and check if U3 is

displayed when the power is turned ON

again. When U3 is displayed, refer to “Judgement and action” for U3.

4 Check linear expansion valve. Refer to "8-5.HOW TO CHECK THE

COMPONENTS".

Open/short circuit of discharge temperature thermistor (TH4)/comp. surface thermistor (TH34)

Abnormal if open (3: or less) or short (217: or more) is detected during compressor operation. (Open (3: or less) detection is inoperative for 10 minutes of compressor starting process and for 10 minutes after or during defrosting.)

1 Disconnection or contact failure

of connector (TH4/TH34) on the outdoor controller circuit board.

2 Defective thermistor 3 Defective outdoor controller

circuit board

1 Check connection of connector (TH4/TH34) on the outdoor controller circuit board.

Check the lead wire for thermistor (TH4/TH34)

Refer to "8-6. TEST POINT DIAGRAM".

2 Check resistance value of thermistor (TH4/

TH34) or temperature on LED display. (Thermistor/TH4/TH34: Refer to "8-5.HOW TO CHECK THE COMPONENTS".)

(SW2: Refer to"8-7.OUTDOOR UNIT

OPERATION MONITOR FUNCTION".)

3 Replace outdoor controller board.

OCH562

Check code

Abnormal point and detection method

Case

Judgment and action

Temperature of heatsink

Abnormal if heatsink thermistor (TH8) detects 94°C.

1 The outdoor fan motor is

locked.

2 Failure of outdoor fan motor 3 Air flow path is clogged. 4 Ambient temperature is high. 5 Defective thermistor 6 Defective input circuit of

outdoor power circuit board

7 Failure of outdoor fan drive

circuit

12 Check outdoor fan.

3 Check air flow path for cooling. 4 Check if there is something which causes

temperature rise around outdoor unit.

(Upper limit of ambient temperature is 46:.) Turn off power, and on again to check if U5 is displayed within 30 minutes. If U4 is displayed instead of U5, refer to check code U4.

5 Check resistance value of thermistor (TH8)

or temperature by microcomputer. (Thermistor/TH8: Refer to "8-5.HOW TO CHECK THE COMPONENTS".) (SW2: Refer to "8-7. OUTDOOR UNIT OPERATION MONITOR FUNCTION".)

6 Replace outdoor power circuit board. 7 Replace outdoor controller circuit board.

Open/short of outdoor unit thermistors (TH3, TH32, TH33, TH6, TH7, and TH8)

Abnormal if open or short is detected during compressor operation. Open detection of thermistors TH3, TH32 and TH6 is not detected for 10 seconds to 10 minutes after compressor starting and 10 minutes after and during defrosting. Note: Check which unit has abnormality in its thermistor by switching the mode of SW2. (Refer to "8-7.OUTDOOR UNIT OPERATION MONITOR FUNCTION".)

Heatsink thermistor (TH8) is in

the power module.

1 Check connection of connector (TH3, TH32,

TH33, TH6/TH7) on the outdoor controller circuit board. Check connection of connector (CN3) on the outdoor power circuit board. Check the lead wire for thermistor (TH3, TH32, TH33, TH6, TH7, TH8). Refer to "8-6. TEST POINT DIAGRAM".

Check resistance value of thermistor (TH3, TH32, TH33, TH6, TH7, TH8) or check temperature on LED display. (Thermistor/TH3, TH32, TH33, TH6, TH7, TH8: Refer to "8-5.HOW TO CHECK THE COMPONENTS.")

(SW2: Refer to

"8-7.OUTDOOR UNIT

OPERATION MONITOR FUNCTION".

)

3 Replace outdoor controller circuit board.

1 Disconnection or contact failure

of connectors Outdoor controller circuit board: TH3, TH32, TH33, TH6/TH7

Outdoor power circuit board:

CN3

2 Defective thermistor 3 Defective outdoor controller

circuit board

(

)

Power module

Check abnormality by driving power module in case overcurrent is detected. (UF or UP error condition)

1 Defective outdoor power circuit

board

2 Decrease of power supply voltage 3 Loosens, disconnection or

reverse of compressor wiring connection

4 Defective compressor

1 Replace outdoor power circuit board. 2 Check facility of power supply. 3 Correct the wiring (U

•V•

W phase) to compressor. Refer to "8-6. TEST POINT DIAGRAM (Outdoor power circuit board)".

4 Check compressor referring to "8-4.HOW TO

CHECK THE PARTS".

Too low superheat due to low discharge temperature

Abnormal if discharge superheat is continuously detected -15: or less for 3 minutes even though linear expansion valve has minimum open pulse after compressor starts operating for 10 minutes.

1 Disconnection or loose

connection of discharge temperature thermistor (TH4)

2 Defective holder of discharge

temperature thermistor

3 Disconnection or loose connection

of linear expansion valve’s coil

4 Disconnection or loose

connection of linear expansion valve’s connector

5 Defective linear expansion valve

12 Check the installation conditions of dis-

charge temperature thermistor (TH4).

3 Check the coil of linear expansion valve. Refer to "8-5.HOW TO CHECK THE

COMPONENTS".

4 Check the connection or contact of LEV-A and

LEV-B on outdoor controller circuit board.

5 Check linear expansion valve. Refer to "8-4.HOW TO CHECK THE PARTS".

Thermistors

Open detection Short detection

Symbol Name

TH3 Thermistor <Liquid temperature> - 40°C or below 90°C or above TH32 Thermistor <Inlet water temperature> - 40°C or below 102°C or above TH33 Thermistor <Suction pipe temperature> - 40°C or below 90°C or above

TH6 Thermistor <Plate HEX liquid temperature> - 40°C or below 90°C or above

TH7 Thermistor <Ambient temperature> - 40°C or below 90°C or above

TH8 Internal thermistor - 35°C or below 170°C or above

Outdoor fan motor

Abnormal if rotational frequency of the fan motor is not detected during DC fan motor operation. Fan motor rotational frequency is abnormal if;

• 100 rpm or below detected continuously

for 15 seconds at 20: or more outside air temperature

• 50 rpm or below or 1500 rpm or more

detected continuously for 1 minute.

1 Failure in the operation of the

DC fan motor

2 Failure in the outdoor circuit

controller board

1 Check or replace the DC fan motor.

2 Check the voltage of the outdoor circuit

controller board during operation.

3 Replace the outdoor circuit controller board.

(when the failure is still indicated even after performing the remedy 1 above.)

OCH562

(4220)

Detailed

codes

To find out the details about U9 error, turn ON SW2-1, 2-2, 2-3, 2-4, 2-5 and 2-6 when U9 error occurs. To find out the detail history (latest) about U9 error, turn ON SW2-1, 2-2 and 2-6. Refer to "8-7.OUTDOOR UNIT OPERATION MONITOR FUNCTION".

Overvoltage error

• Increase in DC bus voltage to

400 V

1 Abnormal increase in power source

voltage

2 Disconnection of compressor wiring

3 Defective outdoor power circuit

board

4 Compressor has a ground fault.

1 Check the field facility for the power

supply.

2 Correct the wiring (U.V.W phase) to

compressor. Refer to "8-6. TEST POINT DIAGRAM (Outdoor power circuit board)".

3 Replace outdoor power circuit board. 4 Check compressor for electrical insula-

tion. Replace compressor.

Undervoltage error

• Instantaneous decrease in DC

bus voltage to 200 V

1 Decrease in power source voltage, instantaneous stop. 2 Disconnection or loose connection of CN52C on the outdoor power circuit board/controller circuit board 3 Defective converter drive circuit in outdoor power circuit board 4 Defective 52C drive circuit in outdoor power circuit board 5 Disconnection or loose connection of main smoothing capacitor CB 6 Disconnection or loose connection of CN2 on the outdoor power circuit board /controller circuit board 7 Power circuit failure on DC supply for 18V DC output on outdoor controller circuit board

1 Check the field facility for the power 　supply.

2 Check CN52C wiring.

3 Replace outdoor power circuit board.

4 Replace outdoor power circuit board.

5 Check CB wiring.

6 Check CN2 wiring.

7 Replace outdoor controller circuit board.

Input current sensor error/ L1-phase open error

• Decrease in input current

through outdoor unit to 0.1A only if operation frequency is more than or equal to 40Hz or compressor current is more than or equal to 6A.

1 Defective input current detection circuit in outdoor power circuit board 2 Defective outdoor controller circuit board

1 Replace outdoor power circuit board.

2 Replace outdoor controller circuit board.

Abnormal power synchronous signal

• No input of power synchronous

signal to power circuit board

• Power synchronous signal

of 44 Hz or less, or 65 Hz or more is detected on power circuit board.

1 Distortion of power source voltage,

noise superimposition.

2 Disconnection or loose connection

of earth wiring

3 Disconnection or loose connection

of CN2 on the outdoor power circuit board /controller circuit board

4 Defective power synchronous signal

circuit in outdoor controller circuit board

5 Defective power synchronous signal

circuit in outdoor power circuit board

1 Check the field facility for the power

supply.

2 Check earth wiring.

3 Check CN2 wiring.

4 Replace outdoor controller circuit board.

5 Replace outdoor power circuit board.

Continue to the next page.

Check code

Abnormal point and detection method

Case

Judgment and action

PFC error (Overvoltage/ Undervoltage/Overcurrent)

• PFC detected any of the fol-

lowings

a) Increase of DC bus voltage

to 420V.

b) Decrease in PFC control

voltage to 12V DC or lower

c) Increase in input current to

50A peak (For models equipped with single-phase PFC only)

Not applicable for W112VHA models. Check for the switch settings for Model

Select on the outdoor controller circuit board.

PFC/IGBT error (Undervoltage)

•

When Compressor is running, DC bus voltage stays at 310V or lower for consecutive 10 seconds

1 Incorrect switch settings on the

outdoor controller circuit board for model select

2 Defective outdoor power circuit

board

3 Defective outdoor controller

circuit board

1 Correction of a model select

2 Replace outdoor power circuit board.

3 Replace outdoor controller circuit board.

OCH562

Check code

Abnormal point and detection method

Case

Judgment and action

Compressor overcurrent interruption (When compressor locked)

Abnormal if overcurrent of DC bus or compressor is detected within 30 seconds after compressor starts operating.

1 Decrease of power supply

voltage

2 Looseness, disconnection or

converse of compressor wiring connection

3 Defective compressor 4 Defective outdoor power board 5 Decreased water flow 6 Clogged filter of water pipe 7 Clogged plate heat exchanger 8 Locked water pump 9 Malfunction of water pump

1 Check facility of power supply.

2 Correct the wiring (U

•V•

W phase) to

compressor.

Refer to "8-6. TEST POINT DIAGRAM

(Outdoor power circuit board)" .

3 Check compressor. Refer to

"8-4.HOW TO

CHECK THE PARTS".

4 Replace outdoor power circuit board. 5

9 Check water circuit and repair the defect.

Overheat protection

Abnormal if outdoor pipe thermistor (TH3) detects 70: or more or condensing temperature of pressure sensor (63HS) detects 70: or more during compressor operation.

Defective outdoor fan (fan motor) or short cycle of outdoor unit during cooling operation

2 Defective outdoor pipe

thermistor (TH3)

3 Defective outdoor controller

board

4 Defective pressure sensor

1 Check outdoor unit air passage.

23 Turn the power off and on again to check

the check code. If U4 is displayed, follow the U4 processing direction.

4 Check pressure by microcomputer. (Pressure sensor/ 63HS) (SW2: Refer to "

8-7.OUTDOOR UNIT

OPERATION MONITOR FUNCTION".)

Current sensor error or input current error

· Abnormal if current sensor detects –1.0 A to 1.0 A during compressor operation.

(This error is ignored during test run.)

Abnormal if 38 A of input current is detected

or 34 A or more of input current is detected for 10 seconds continuously.

1 Disconnection of compressor

wiring

2 Defective circuit of current

sensor on outdoor power circuit board

3 Decrease of power supply

voltage

1 Correct the wiring (U

•V•

W phase) to compressor. Refer to "8-6. TEST POINT DIAGRAM (Outdoor power circuit board)".

2 Replace outdoor power circuit board. 3 Check the facility of power supply.

Compressor overcurrent interruption

Abnormal if overcurrent DC bus or compressor is detected after compressor starts operating for 30 seconds.

Decrease of power supply voltage

2 Looseness, disconnection or

converse of compressor wiring connection

3 Defective fan of outdoor units 4 Short cycle of indoor/outdoor

units

5 Defective input circuit of out-

door controller board

6 Defective compressor 7 Decreased water flow 8 Clogged filter of water pipe 9 Clogged plate heat exchanger

0 Locked water pump 1 Malfunction of water pump

1 Check facility of power supply. 2 Correct the wiring (U

•V•

W phase) to compressor. Refer to "8-6. TEST POINT DIAGRAM (Outdoor power circuit board)".

3 Check outdoor fan. 4 Solve short cycle. 5 Replace outdoor controller circuit board. 6 Check compressor.

Refer to "8-4.HOW TO CHECK THE PARTS".

Note: Before the replacement of the outdoor

controller circuit board, disconnect the wiring to compressor from the outdoor power circuit board and check the output voltage among phases, U, V, W, during test run. No defect on board if voltage among phases (U-V, V-W and W-U) is same. Make sure to perform the voltage check with same performing frequency.

7~1 Check water circuit and repair the defect.

Low pressure (63L operated)

Abnormal if 63L is operated (under -0.03 MPa) during compressor operation. 63L: Low-pressure switch

1 Stop valve of outdoor unit is

closed during operation.

2 Disconnection or loose

connection of connector (63L) on outdoor controller board

3 Disconnection or loose

connection of 63L

4 Defective outdoor controller

board

5 Leakage or shortage of

refrigerant

6 Malfunction of linear expansion

valve

1 Check stop valve.

2~4 Turn the power off and on again to check

if F3 is displayed on restarting. If F3 is displayed, follow the F3 processing direction.

5 Correct to proper amount of refrigerant.

6 Check linear expansion valve.

Refer to "8-5.HOW TO CHECK THE COMPONENTS".

OCH562

Check code

Abnormal point and detection method

Judgment and action

Case

Remote controller transmission error (E0)/signal receiving error (E4)

Abnormal if main or sub remote controller

cannot receive any transmission normally from Interface unit/Flow temp. controller of refrigerant address “0” for 3 minutes.

(Check code: E0)

Abnormal if sub-remote controller could

not receive any signal for 2 minutes. (Check code: E0)

Abnormal if Interface/Flow temp.

controller board can not receive any data normally from remote controller board or from other Interface/Flow temp. controller board for 3 minutes.

(Check code: E4)

Interface/Flow temp. controller board

cannot receive any signal from remote controller for 2 minutes.

(Check code: E4)

Check disconnection or looseness of

Interface unit/Flow temp. controller unit or transmission wire of remote controller.

Set one of the remote controllers “main”, If

there is no problem with the action above.

Check wiring of remote controller.

• Total wiring length: max. 500 m

(Do not use cable × 3 or more.)

•

The number of connecting remote controller

Refer to the indoor units service manual.

When it is not the above-mentioned problem of

~ Diagnose remote controllers.

a) When “RC OK” is displayed, remote

controllers have no problem.

Turn the power off, and on again to check. If abnormality generates again, replace Interface/Flow temp. controller board.

b) When “RC NG” is displayed, replace

remote controller.

c) When “RC E3” or “ERC 00-66” is displayed,

noise may be causing abnormality.

Contact failure at transmission

wire of remote controller

All remote controllers are set

as “sub” remote controller. In this case, E0 is displayed on remote controller, and E4 is displayed at LED (LED1, LED2) on the outdoor controller circuit

board. Miswiring of remote controller Defective transmitting receiving

circuit of remote controller Noise has entered into the

transmission wire of remote

controller.

Remote controller control board

Abnormal if data cannot be read nor-

mally from the nonvolatile memory of the remote controller control board. (Check code: E1)

Abnormal if the clock function of remote

controller cannot be operated normally. (Check code: E2)

Defective remote controller

Replace remote controller.

Remote controller transmission error (E3)/signal receiving error (E5)

Abnormal if remote controller could not find blank of transmission path for 6 seconds and could not transmit.

(Check code: E3)

When remote controller receives the transmitted data same time and compares these data. Abnormal if the data is judged to be different for 30 continuous times. (Check code: E3)

Abnormal if Interface/Flow temp. controller board could not find blank of transmission path. (Check code: E5)

When Interface/Flow temp. controller receives the transmitted data same time and compares these data. Abnormal if the data is judged to be different for 30 continuous times. (Check code: E5)

1 Set a remote controller to main, and the

other to sub.

2~4 Diagnose remote controller.

a) When “RC OK” is displayed, remote con-

trollers have no problem. Turn the power off, and on again to check. When becoming abnormal again, replace indoor controller board.

b) When “RC NG” is displayed, replace

remote controller.

c) When “RC E3” or “ERC 00-66” is dis-

played, noise may be causing abnormality.

1 2 remote controllers are set as

“main.”

(In case of 2 remote controllers)

Note that some models can

only connect 1 remote control-

ler. For more detail, refer to the

indoor unit's service manual.

2 Defective transmitting receiving

circuit of remote controller

3 Defective transmitting receiving

circuit of Interface/Flow temp.

controller board

4 Noise has entered into trans-

mission wire of remote control-

ler.

Interface unit/Flow temp. controller-outdoor unit communication error (Signal receiving error)

1 Abnormal if Interface/Flow temp.

controller board cannot receive any signal normally for 6 minutes after turning the power on.

2 Abnormal if Interface/Flow temp.

controller board cannot receive any signal normally for 3 minutes.

Contact failure, short circuit or, miswiring (converse wiring) of Interface unit/Flow temp. controller-outdoor unit connecting wire

2 Defective transmitting receiving

circuit of Interface/Flow temp. controller board

3 Defective transmitting receiving

circuit of Interface/Flow temp. controller board

Noise has entered into Interface unit/Flow temp. controlleroutdoor unit connecting wire.

* Check LED display on the outdoor control circuit

board. (Connect A-control service tool, PACSK52ST.)

1 Check disconnection or looseness of

Interface unit/Flow temp. controller-outdoor unit connecting wire of Interface unit/Flow temp. controller or outdoor unit.

2~4 Turn the power off, and on again to check.

If abnormality generates again, replace Interface/Flow temp. controller board or outdoor controller circuit board.

Interface unit/Flow temp. controlleroutdoor unit communication error (Signal receiving error) (Outdoor unit)

(1) Abnormal if outdoor controller circuit

board could not receive anything

normally for 3 minutes.

1 Contact failure of Interface unit/

Flow temp. controller-outdoor unit connecting wire

2 Defective communication circuit

of outdoor controller circuit board

3 Defective communication

circuit of Interface/Flow temp. controller board

Noise has entered into Interface unit/Flow temp. controlleroutdoor unit connecting wire.

1 Check disconnection or looseness of

Interface unit/Flow temp. controller-outdoor unit connecting wire of Interface unit/Flow temp. controller or outdoor unit.

2~4 Turn the power off, and on again to

check. Replace Interface/Flow temp. controller board or outdoor controller circuit board if abnormality is displayed again.

OCH562

Check code

Abnormal point and detection method Judgment and action

Case

Interface unit/Flow temp. controlleroutdoor unit communication error (Transmitting error) (Outdoor unit)

(1) Abnormal if “0” receiving is detected 30

times continuously though outdoor controller circuit board has transmitted “1”.

(2) Abnormal if outdoor controller circuit

board could not find blank of transmission path for 3 minutes.

Interface unit/Flow temp. controller-outdoor unit connecting wire has contact failure.

2 Defective communication circuit

of outdoor controller circuit board

3 Noise has entered power supply. 4 Noise has entered Interface

unit/Flow temp. controlleroutdoor unit connecting wire.

1 Check disconnection or looseness of

Interface unit/Flow temp. controller-outdoor unit connecting wire.

2~4 Turn the power off, and on again to

check. Replace outdoor controller circuit board if abnormality is displayed again.

Non defined check code

This code is displayed when non defined check code is received.

1 Noise has entered transmission

wire of remote controller.

2 Noise has entered Interface

unit/Flow temp. controlleroutdoor unit connecting wire.

12 Turn the power off, and on again to check. Replace Interface/Flow temp. controller

board or outdoor controller circuit board if abnormality is displayed again.

Serial communication error

Abnormal if serial communication between outdoor controller circuit board and outdoor power circuit board is defective.

1 Wire disconnection or contact

failure of connector CN2 between the outdoor controller circuit board and the outdoor power circuit board

2 Wire disconnection or contact

failure of connector CN4 between the outdoor controller circuit board and the outdoor power circuit board

3 Defective communication circuit

of outdoor power circuit board

4 Defective communication circuit

of outdoor controller circuit board for outdoor power circuit board

12 Check connection of each connector CN2

and CN4 between the outdoor controller circuit board and the outdoor power circuit board.

3 Replace outdoor power circuit board.

4 Replace outdoor controller circuit board.

Freezing/overheating protection is working

(1) Freezing protection

<Cooling mode> Abnormal if plate heat exchanger pipe temperature (TH6) stays at -5: or lower for 10 seconds or abnormal if plate heat exchanger pipe thermistor (TH6) stays at

-2: or lower and compressor operation frequency is minimum for 5 minutes after compressor starts operating for 6 minutes. <Heating mode> Abnormal if inlet water temperature thermistor (TH32) is 15: or lower, and the following condition (1 or 2) are detected.

1. 1 minute has passed since defrosting operation started and plate heat exchanger pipe temperature thermistor (TH6) stays at -6: or lower for continuously 30 seconds.

2. During defrosting operation and plate heat exchanger pipe temperature thermistor (TH6) stays at -16: or lower for continuously 10 seconds.

(2) Overheating protection <Heating mode>

Abnormal if condensing temperature of pressure sensor (63HS) detects Tcond. : or more and compressor operation frequency is less than or equal to 30 Hz. Detection is inoperative during defrosting.

(1) Freezing protection

1 Reduced water flow

· Clogged filter

· Leakage of water

2 Low temperature

· Low-load

· Inlet water is too cold.

3 Defective water pump 4 Defective outdoor fan control 5 Overcharge of refrigerant 6

Defective refrigerant circuit (clogs)

Malfunction of linear expansion valve

<Heating mode> 1 Reduced water flow

· Clogged filter

· Leakage of water

2 Low temperature

· Low-load

· Inlet water is cold.

3 Defective water pump 4

Leakage or shortage of refrigerant

Malfunction of linear expansion valve

(2) Overheating protection

1 Reduced water flow

· Clogged filter

· Leakage of water

2 High temperature

· Over-load

· Inlet water is too warm.

3 Defective water pump 4 Overcharge of refrigerant 5

Defective refrigerant circuit (clogs)

Malfunction of linear expansion valve

(1) Freezing protection

12 Check water piping.

3 Check water pump. 4 Check outdoor fan motor. 5~7 Check operating condition of refrigerant

circuit.

7 Check linear expansion valve.

12 Check water piping.

3 Check water pump. 4 Correct to proper amount of refrigerant. 5 Check linear expansion valve. Refer to "8-5.

HOW TO CHECK THE COMPONENTS".

(2) Overheating protection

12 Check water piping.

3 Check water pump.

Check operating condition of refrigerant circuit.

6 Check linear expansion valve.

Ambient temperature (TH7)

stage-g

stage-f

stage-e

stage-d

stage-c

stage-b

stage-a

[ :]

Tcond

stage-a stage-b stage-c stage-d stage-e stage-f stage-g

-18 -17 -15 -14 -12 -11 -9 -8 -6 -5 -3 -2

W112

Model

63 60 57

48 48 48

Tcond

stage-x

stage-x stage-y

61 59

stage-y

34 35 39 40

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Check code

Abnormal point and detection method

Judgment and action

Case

Pipe temperature

Abnormal if the following conditions are detected for continuously 3 minutes after compressor starts operating for 10 minutes.

1. Cooling mode T63HS-TH7 [ 2: and TH3-TH7 [ 4: or T63HS-TH3 < 0: and TH32-TH6 [ 0: and

Compressor operation frequency is 61Hz or more.

2. Heating mode

T63HS-TH32 [ 2: and TH6-TH32 [ 1: and TH7-TH3 [ 1: and Compressor operation frequency is 61Hz or more.

T63HS: Condensing temperature of pressure

sensor (63HS)

Thermistor

TH3: Liquid temperature TH32: Inlet water temperature TH6: Plate HEX Liquid temperature TH7: Ambient temperature

1 Leakage or shortage of

refrigerant

2 Malfunction of linear expansion

valve

3 Refrigerant circuit is clogged

with foreign objects.

Note: Clogging occurs in the parts

which become below freezing point when water enters in refrigerant circuit.

4 Disconnection of thermistor

holder.

1 Check intake superheat. Check leakage of refrigerant.

2 Check linear expansion valve.

3 After recovering refrigerant, remove water

from entire refrigerant circuit under vacuum more than 1 hour.

4 Check temperature display on outdoor

controller circuit board. Temperature display is indicated by setting SW2 of outdoor controller circuit board. Check the holder of thermistor.

Abnormal pressure of pressure sensor (63HS)

Abnormal if pressure sensor (63HS) detects

0.1 MPa or less. Detection is inoperative for 3 minutes after compressor starting and 3 minutes after and during defrosting.

1 Disconnection or contact failure

of connector (63HS) on the outdoor controller circuit board

2 Defective pressure sensor 3 Defective outdoor controller

circuit board

Check connection of connector (63HS) on the

outdoor controller circuit board.

Check breaking of the lead wire for thermistor (63HS). 2 Check pressure by microcomputer. (Pressure sensor/ 63HS) (SW2: Refer to "

8-7. OUTDOOR UNIT OPERATION MONITOR".) FUNCTION".

3 Replace outdoor controller board.

Inlet water temperature

Abnormal if the following conditions are detected for continuously 10 seconds.

1. Cooling mode During compressor operation TH32 < 3:

2. Heating mode (exclude defrosting) During compressor operation TH32 < -10:

3. Defrosting mode During compressor operation TH32 < 0:

Thermistor

TH32: Inlet water temperature

1 Reduced water flow

· Clogged filter

· Leak of water

2 Low temperature

· Low-load

· Low temperature inlet water

3 Defective water pump

4 Leakage or shortage of

refrigerant

12 Check water piping.

3 Check water pump.

4 Check intake superheat.

Check leakage of refrigerant.

OCH562

8-4. HOW TO CHECK THE PARTS PUHZ-W112VHA PUHZ-W112VHA-BS

1 2 3 4 5

Gray

Orange

Red

Yellow

Black

Parts name

Check points

Disconnect the connector then measure the resistance with a tester. (At the ambient temperature of 10 to 30:)

TH3: Liquid pipe temp. TH4: Discharge temp. TH6: Plate Hex liquid pipe temp. TH7: Ambient temp. TH8: Heatsink temp. TH32: Inlet water temp. TH33: Suction pipe temp. TH34: Comp. surface thermistor

Normal

160 to 410 k"

4.3 to 9.6 k"

4.4 to 9.8 k" 39 to 105 k"

TH4

TH34

TH3 TH6

TH7 TH33 TH32

TH8

Abnormal

Open or short

Measure the resistance between the terminals with a tester. (At the ambient temperature of 20

)

Solenoid valve coil <Four-way valve> (21S4)

Compressor (MC)

Normal

Abnormal

Open or short

Refer to the next page.Fan motor (MF1)

1435 ± 150 "

Normal

Abnormal

Open or short

0.188 "

Measure the resistance between the terminals with a tester. (Winding temperature 20

)

Linear expansion valve (LEV-A) (LEV-B)

Disconnect the connector then measure the resistance with a tester. (Winding temperature 20°C)

Normal

Gray - Black Gray - Red

Gray - Yellow

Gray - Orange

Abnormal

46±3Ω

Open or short

OCH562

Notes

· High voltage is applied to the connector (CNF1, 2) for the fan motor. Pay attention to the service.

· Do not pull out the connector (CNF1, 2) of the motor with the power supply on. (It may damage the outdoor controller circuit board and fan motor.) Self check Symptom: The outdoor fan does not run.

Check method of DC fan motor (fan motor / outdoor controller circuit board)

Wiring contact check

Check contact of fan motor connector (CNF1) (CNF2)

Recover wiring.

END

Replace fan motor. Replace

outdoor controller circuit board.

Replace outdoor controller circuit board.

Replace fan motor.

Check fan motor rotation.

Is the voltage normal?

Is the fuse normal?

Is there contact failure?

Check fuse (F5) on outdoor controller circuit board.

Yes

Power supply check

Measure the voltage on the outdoor controller circuit.

TEST POINT1 VDC DC 280-380 V (between 1 (+) and 4 (-) of CNF1,2)

2 VCC DC 15 V (between 5 (+) and 4 (-) of CNF1,2)

OCH562

8-5. HOW TO CHECK THE COMPONENTS

Low temperature thermistors

• Thermistor <Liquid pipe> (TH3)

• Thermistor <Plate Hex liquid pipe> (TH6)

• Thermistor <Ambient> (TH7)

• Thermistor <Suction pipe> (TH33)

0: 15 kΩ 10: 9.6 kΩ 20: 6.3 kΩ 25: 5.2 kΩ

0: 180 kΩ 25: 50 kΩ 50: 17 kΩ 70: 8 kΩ 90: 4 kΩ

30: 4.3 kΩ 40: 3.0 kΩ

Thermistor R0 = 15 kΩ ± 3% B constant = 3480 ± 2%

t =15exp{3480(

273+t – 273

)}

Thermistor R50 = 17 kΩ ± 2% B constant = 4150 ± 3%

Rt =17exp{4150(

273+t – 323

)}

Thermistor R120 = 7.465k' ± 2%

B constant = 4057 ± 2%

t =7.465exp{4057(

273+t – 393

)}

Medium temperature thermistor

• Thermistor <Heatsink> (TH8)

20: 250 kΩ 30: 160 kΩ 40: 104 kΩ 50: 70 kΩ 60: 48 kΩ

70: 34 kΩ 80: 24 kΩ 90: 17.5 kΩ 100: 13.0 kΩ 110 : 9.8 kΩ

High temperature thermistors

• Thermistor <Discharge pipe> (TH4)

• Thermistor <Comp. surface> (TH34)

-20 -10 0 10 20 30 40 50

Temperature (:)

Resistance (k")

200

150

100

25 50 75 100 125

Temperature (:)

Resistance (k")

500

400

300

200

100

50 75 100 120

Temperature (:)

Resistance (k")

OCH562

Low temperature thermistor

• Thermistor <Inlet water> (TH32)

0: 15 kΩ 10: 9.6 kΩ 20: 6.3 kΩ 25: 5.2 kΩ

30: 4.3 kΩ 40: 3.0 kΩ

Thermistor R0 = 15 kΩ ± 2.5% B constant = 3450 ± 2%

t =15exp{3450(

273+t – 273

)}

-20 -10 0 10 20 30 40 50

Temperature(:)

Resistance (k")

0.5

2.5 5

2.5

4.5

Vout (V)

PRESSURE (MPa)

WHT

BLU

BLK

SENSOR

5V DC

GND

63HS

Vout

MICRO PROCESSOR

MULTI CONTROLLER BOARD

3-1 : 5V (DC) 2-1 : Output Vout (DC)

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(2) Linear expansion valve operation

Open

Extra tightening (about 32 pulse)

Pulse number

500 pulse Opening a valve all the way

Valve position (capacity)

Opening a valve : 8 7 6 5 4 3 2 1 8 Closing a valve : 1 2 3 4 5 6 7 8 1 The output pulse shifts in above order.

• When linear expansion valve operation stops, all output phase

become OFF.

• When the switch is turned on, 700 pulse closing valve signal will be

sent till it goes to

point in order to define the valve position. (The

pulse signal is being sent for about 20 seconds.)

• When the valve moves smoothly, there is no sound or vibration

occurring from the linear expansion valve: however, when the pulse number moves from to or when the valve is locked, sound can be heard.

No sound is heard when the pulse number moves from to in

case coil is burnt out or motor is locked by open-phase.

• Sound can be detected by placing the ear against the screw driver

handle while putting the screw driver to the linear expansion valve.

LEV

Gray

Orange

Red

Yellow

Black

Connector LEV-A

LEV-B

DC12V

Outdoor controller board

Drive circuit

Linear expansion valve

(1) Operation summary of the linear expansion valve

• Linear expansion valve opens/closes through stepping motor after receiving the pulse signal from the outdoor controller board.

• Valve position can be changed in proportion to the number of pulse signal.

OFF

Output

(Phase)

Output

2 3 4

5 6 7 8

OFF

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Main body

Lead wire

Stopper

Coil

Be sure to attach the stopper.

(3) How to attach and detach the coil of linear expansion valve

<Composition> Linear expansion valve is separable into the main body and the coil as shown in the diagram below.

Hold the lower part of the main body (shown as A) firmly so that the main body does not move and detach the coil by pulling it upward. Be sure to detach the coil holding main body firmly. Otherwise pipes can bend due to pressure.

Hold the lower part of the main body (shown as A) firmly so that the main body does not move and attach the coil by inserting it downward into the main body. Then securely attach the coil stopper to main body. (At this time, be careful that stress is not added to lead wire and main body is not wound by lead wire.) If the stopper is not firmly attached to main body, coil may be detached from the main body and that can cause defective operation of linear expansion valve. To prevent piping stress, be sure to attach the coil holding the main body of linear expansion valve firmly. Otherwise pipe may break.

OCH562

CNS

S1-S2: 230 V AC

CNAC

2 to 4: Power supply for outdoor controller circuit board (230 V AC) 1 to 3: Power supply for indoor and outdoor unit connection wire (230 V AC)

CNF1, CNF2 Connect to the fan motor

1-4: 280-380 V DC 5-4: 15 V DC 6-4: 0-6.5 V DC 7-4: 15 V DC (When stopped)

7.5 V DC (When operated) (0 V-15 V pulse)

21S4

4-way valve

63H

High pressure switch

CN4

Transmission to outdoor power circuit board (CN4)

SW6

Model select

SW5

Function switch

SW1

Forced defrost, detect history record reset

CNDM

1 to 2: Input of low-level sound priority mode

TH4

Thermistor <Discharge>

TH3

Thermistor <Liquid pipe>

TH7/6

Thermistor <Outdoor/ Plate Hex liquid>

CNDC

280-380 V DC (1+, 3-) (Outdoor power circuit board for)

VFG

(Voltage between right pins of PC5C and PC5D, pin 3 and pin 4) (Same as

(CNF1

7(+)-4(-))

VSP

(Voltage between pins of C5A, C5B): DC 0 V (when stopped), DC 1– 6.5 V (when operated)

SW2

Operation monitor function

LEV-A,B

Linear expansion valve

SW8

Function switch

CN2

Connect to the outdoor power circuit board (CN2) 1-5: Reception from

power circuit board

2-5: Zero cross signal (0-5 V DC) 3-4:

18V DC

6-5: 16V DC 7-5: 16V DC

CN52C

Connect to the power circuit board (CN52C) (HW140V)

TH32

Thermistor <Inlet water temperature>

63L

Low pressure switch

TH33

Thermistor <Suction pipe temperature>

SW7

Function switch

8-6. TEST POINT DIAGRAM Outdoor controller circuit board PUHZ-W112VHA PUHZ-W112VHA-BS

<CAUTION> TEST POINT 1 is high voltage.

TH34

Thermistor <Comp. surface>

SW9

Function switch

SV1

Connection for option (Drain hose heater output)

OCH562

CNAC1, CNAC2

230 V AC Connect to the outdoor controller circuit board (CNAC)

NI, LI

Voltage of 230 V AC is input (Connect to the terminal block (TB1))

EI, E4

Connect to the earth

DCL1, DCL2

Connect to DCL

Connect to the smoothing capacitor CB +

U/V/W

Connect to the compressor (MC) Voltage among phases: 10 V-180 V AC

CNDC

280-380 V DC (1+, 3-) Connect to the outdoor controller circuit board (CNDC)

E2, E3

Connect to the earth

CN52C

52C driving signal Connect to the outdoor controller circuit board (CN52C)

CN2 Connect to the outdoor controller circuit board (CN2) 1-5: Transmitting signal to outdoor controller circuit board (0-5 V DC) 2-5: Zero cross signal (0-5 V DC) 3-4: 18 V DC 6-5: 16 V DC 7-5: 16 V DC

Connect to the smoothing capacitor CB -

CN4 Connect to the outdoor controller circuit board (CN4)

Brief Check of POWER MODULE

Usually, they are in a state of being short-circuited if they are broken. Measure the resistance in the following points (connectors, etc.). If they are short-circuited, it means that they are broken.

1. Check of POWER MODULE 1 Check of DIODE circuit

R - L1 , S - L1 , R - N1 , S - N1 2 Check of IGBT circuit L2 - N1 3 Check of INVERTER circuit P - U , P - V , P - W , N1 - U , N1 - V , N1 - W

Power module

Note: The marks R , S , L1 , L2 , P , N1 , U , V and W

shown in the diagram are not actually printed on the board.

S R

W V U L2 P N1 L1

Outdoor power circuit board PUHZ-W112VHA PUHZ-W112VHA-BS

OCH562

8-7. OUTDOOR UNIT OPERATION MONITOR FUNCTION

SW2 setting

1ON2 3 4 5 6

Display detail

Explanation for display Unit

Operation indicator SW2: Indicator change of self diagnosis

(Be sure that the 1 to 6 in the SW2 are set to OFF.)

(1) Display when the power supply is ON.

When the power supply is ON, blinking displays by turns. Wait for 10 seconds at the longest.

(2) When the display lights (Normal operation)

1 Operation mode display

1ON2 3 4 5 6

(Initial setting)

SW2

1 second

interval

LED3

(Lighting)

Display Operation Model

The tens digit : Operation mode

The ones digit : Relay output

O C H

Display

0 1 2 3 4 5 6 7 8 A

Compressor

Warming-up Compressor

4-way valve

Solenoid valve

— — —

— ON ON ON ON

—

— — — — — — —

— ON ON

—

— ON ON

—

— ON ON

— ON

—

— —

OFF

COOLING

HEATING

DEFROSTING

2 Display during error postponement

Postponement code is displayed when compressor stops due to the work of protection device. Postponement code is displayed while error is being postponed.

(3) When the display blinks

Inspection code is displayed when compressor stops due to the work of protection devices.

Display

Inspection unit

0 Outdoor unit

Display

Contents to be inspected (During operation) U1 Abnormal high pressure (63H operated) U2 Abnormal high discharging temperature, shortage of refrigerant U3 Open/short circuit of discharging thermistor (TH4, TH34) U4 Open/short of outdoor unit thermistors (TH3, TH32, TH6, TH7, TH8 and TH33) U5 Abnormal temperature of heatsink U6 Abnormality of power module U7 Abnormality of superheat due to low discharge temperature U8 Abnormality in outdoor fan motor U9 Voltage fault, Input current sensor error Ud Overheat protection UF Compressor overcurrent interruption (When Comp. locked)

UH Current sensor error

UP Compressor overcurrent interruption P6 Abnormality of Interface or FTC units P8 Abnormality of pipe temperature UE Abnormality pressure of pressure sensor PE Abnormality of inlet water temperature Ed Serial communication error

Display

Contents to be inspected (When power is turned on) F5 63H connector(yellow) is open. E8 Interface unit/Flow temp. controller-outdoor communication error (Signal receiving error) (Outdoor unit) E9 Interface unit/Flow temp. controller-outdoor communication error (Transmitting error) (Outdoor unit) EA

Miswiring of Interface unit/Flow temp. controller-outdoor unit connecting wire, excessive number of indoor units (2 units or more)

Miswiring of Interface unit/Flow temp. controller-outdoor unit connecting wire (converse wiring or disconnection)

EC Startup time over

E0~E7 Communication error except for outdoor unit

The black square (■) indicates a switch position.

OCH562

SW2 setting

1ON2 3 4 5 6

Display detail

Explanation for display Unit

Pipe temperature / Liquid (TH3)

- 40 to 90

- 40 to 90 (When the coil thermistor detects 0: or below, “–” and temperature are displayed by turns.) (Example) When -10:;

0.5 secs. 0.5 secs. 2 secs.

1ON2 3 4 5 6

Discharge temperature (TH4) 3 to 217

Fan steps 0 to 10

Compressor ON/OFF 0 to 9999

Compressor accumulated operation hours 0 to 9999

3 to 217 (When the discharge thermistor detects 100: or more, hundreds digit, tens digit and ones digit are displayed by turns.) (Example) When 105:;

0.5 secs. 0.5 secs. 2 secs.

Step

100 times

10 hours

0 to 10

0 to 9999 (When the number of times is 100 or more, hundreds digit, tens digit and ones digit are displayed by turns.) (Example) When 42500 times (425

100 times);

0.5 secs. 0.5 secs. 2 secs.

0 to 9999 (When it is 100 hours or more, hundreds digit, tens digit and ones digit are displayed by turns.) (Example) When 2450 hours (245

10 hours);

0.5 secs. 0.5 secs. 2 secs.

1ON2 3 4 5 6

Compressor running current 0 to 50

LEV-A opening pulse 0 to 500

0 to 50 (Value after the decimal point will be truncated.)

0 to 500 (When it is 100 pulse or more, hundreds digit, tens digit and ones digit are displayed by turns. (Example) When 150 pulse;

0.5 secs. 0.5 secs. 2 secs.

Pulse

Deferred error history (1)

Deferred error Blinking: being deferred Lighting: deferment is cancelled “00” is displayed in case of no deferment

Code

display

Code

display

Operation mode when the error occurred

Operation mode when the unit is stopped due to an error is displayed. The displayed code is when the SW2 is set as below.

1ON2 3 4 5 6

(SW2)

1ON2 3 4 5 6

Compressor running frequency 0 to 255

0 to 255 (When it is 100 Hz or more, hundreds digit, tens digit and ones digit are displayed by turns. (Example) When 105 Hz;

0.5 secs. 0.5 secs. 2 secs.

1ON2 3 4 5 6

The black square (■) indicates a switch position.

OCH562

SW2 setting

1ON2 3 4 5 6

Display detail

Explanation for display Unit

Pipe temperature/Liquid (TH3) when error occurred

- 40 to 90

- 40 to 90 (When the coil thermistor detects 0: or below, “–” and temperature are displayed by turns.) (Example) When - 15:;

0.5 secs. 0.5 secs. 2 secs.

1ON2 3 4 5 6

Discharge temperature (TH4) when error occurred 3 to 217

Compressor current when error occurred 0 to 50

Error history (1) (latest) Alternate display of faulty unit number and check code

Error history (2) Alternate display of faulty unit number and check code

3 to 217 (When the temperature is 100: or more, the hundreds digit, tens digit and ones digit are displayed by turns.) (Example) When 130:;

0.5 secs. 0.5 secs. 2 secs.

Code

display

Code

display

0 to 50

When no error history, “ 0 ” and “– –” are displayed by turns.

1ON2 3 4 5 6

Compressor operation duration 0 to 999

0 to 999 (When it is 100 minutes or more, the hundreds digit, tens digit and ones digit are displayed by turns.) (Example) When 245 minutes;

0.5 secs. 0.5 secs. 2 secs.

Minute

1ON2 3 4 5 6

Capacity settings

The outdoor capacity code is shown as below

Code

display

1ON2 3 4 5 6

LEV-B opening when error occurred

Pulse

0 to 500 (When it is 100 pulse or more, hundreds digit, tens digit and ones digit are displayed by turns. (Example) When 150 pulse;

0.5 secs. 0.5 secs. 2 secs.

Model Code PUHZ-W112 20

The black square (

■) indicates a switch position.

OCH562

SW2 setting

Display detail

Explanation for display

Unit

1ON2 3 4 5 6

Plate HEX liquid pipe temperature (TH6)

- 39 to 88

- 39 to 88 (When the temperature is 0: or less, “–” and temperature are displayed by turns.)

1ON2 3 4 5 6

Condensing temperature (T

63HS

)

- 39 to 88

- 39 to 88 (When the temperature is 0: or less, “–” and temperature are displayed by turns.)

0 to 150 (When it is 100 Hz or more, hundreds digit, tens digit and ones digit are displayed by turns.

(Example) When 105 Hz;

0.5 secs. 0.5 secs. 2 secs.

Calculated maximum frequency 0 to 150

1ON2 3 4 5 6

Ambient temperature (TH7)

- 39 to 88

- 39 to 88 (When the temperature is 0: or less, “–” and temperature are displayed by turns.)

1ON2 3 4 5 6

Outdoor heatsink temperature (TH8)

- 40 to 200

- 40 to 200 (When the temperature is 0: or less, “–” and temperature are displayed by turns.) (When the thermistor detects 100: or more, hundreds digit, tens digit and ones digit are displayed by turns.)

1ON2 3 4 5 6

°C

Discharge superheat (SHd) 0 to 255

Cooling and Heating: SHd = TH4-T63HS

0 to 255 (When the SHd is 100°C or more, hundreds digit, tens digit and ones digit are displayed by turns.)

1ON2 3 4 5 6

Outdoor unit setting information

Code

display

Setting details

• The tens digit (Total display for applied setting)

• The ones digit

H·P /

Cooling only

Single phase / 3 phase

Display details

0 : H·P 1 : Cooling only

0 :

Single phase

2 :

3 phase

Setting details

Defrosting switch

Display details

0 : Normal 1 : For high humidity

(Example) When heat pump, 3 phase and defrosting

(normal) are set up, “20” is displayed.

1ON2 3 4 5 6

Water inlet temperature (TH32) 0 to 100

0 to 100

The black square (■) indicates a switch position.

OCH562

1ON2 3 4 5 6

0.1 A

Input current of outdoor unit 0 to 500

0 to 500 (When it is 100 or more, hundreds digit, tens digit and ones digit are displayed by turns.)

1ON2 3 4 5 6

Pulse

LEV-B opening pulse 0 to 500

0 to 500 (When it is 100 pulse or more, hundreds digit, tens digit and ones digit are displayed by turns.)

Code

display

U9 error detail history (latest)

Direct current bus voltage 150 to 400

150 to 400 (When it is 100V or more, hundreds digit, tens digit and ones digit are displayed by turns.)

1ON2 3 4 5 6

Code

display

Deferred error history (2) of outdoor unit

Deferred check code display Blinking: being deferred Lighting: deferment is cancelled “00” is displayed in case of no deferment.

Code

display

Deferred error history (3) of outdoor unit

1ON2 3 4 5 6

Deferred check code display Blinking: being deferred Lighting: deferment is cancelled “00” is displayed in case of no deferment.

1ON2 3 4 5 6

When there is no setting of capacity save, “100” is displayed.

0 to 100

(When the capacity is 100%, hundreds digit, tens

digit and ones digit are displayed by turns.)

(Example) When 100%;

0.5 secs. 0.5 secs. 2 secs.

Capacity save 0 to 100

The black square (■) indicates a switch position.

2 cycles

Number of defrost cycles 0 to FFFE

0 to FFFE (in hexadecimal notation) (When more than FF in hex (255 in decimal), the number is displayed in order of 16

's and 162's, and 161's and 160's places. (Example) When 5000 cycles;

0.5 secs. 0.5 secs. 2 secs.

Normal Overvoltage error Undervoltage error Input current sensor error L

1-phase open error

Abnormal power synchronous signal PFC/IGBT error Undervoltage

* Display examples for multiple errors: Overvoltage (01) + Undervoltage (02) = 03 Undervoltage (02) + Power-sync signal error (08) = 0A L

1 phase open error (04) + PFC/IGBT error (20) = 24

Description Display

00 01 02

SW2 setting

Display detail

Explanation for display Unit

OCH562

SW2 setting

Display detail

Explanation for display Unit

Operation frequency when error occurred. 0 to 225

0 to 225 (When it is 100 Hz or more, hundreds digit, tens digit and ones digit are displayed by turns.) (Example) When 105 Hz;

0.5 secs. 0.5 secs. 2 secs.

1ON2 3 4 5 6

Fan step when error occurred. 0 to 10

0 to 10

1ON2 3 4 5 6

Step

Ambient temperature (TH7) when error occurred.

- 39 to 88

- 39 to 88 (When the temperature is 0°C or less, “–” and temperature are displayed by turns.) (Example) When - 15°C;

0.5 secs. 0.5 secs. 2 secs.

1ON2 3 4 5 6

Pulse

LEV-A opening pulse when error occurred. 0 to 500

0 to 500 (When it is 100 pulse or more, hundreds digit, tens digit and ones digit are displayed by turns.) (Example) When 130 pulse;

0.5 secs. 0.5 secs. 2 secs.

Water inlet temperature (TH32) when error occurred. 0 to 100

0 to 100

1ON2 3 4 5 6

Plate HEX liquid pipe temperature (TH6) when error occurred.

- 39 to 88

- 39 to 88 (When the temperature is 0°C or less, “–” and temperature are displayed by turns.) (Example) When –15°C;

0.5 secs. 0.5 secs. 2 secs.

Condensing temperature when error occurred.

- 39 to 88

- 39 to 88 (When the temperature is 0°C or less, “–” and temperature are displayed by turns.) (Example) When –15°C;

0.5 secs. 0.5 secs. 2 secs.

1ON2 3 4 5 6

Code

display

Error history (3) (Oldest) Faulty unit number and check code are displayed alternately.

When no error history, “0” and “– –“ are displayed by turns.

1ON2 3 4 5 6

3: Liquid pipe thermistor (TH3) 3: Water inlet temp. thermistor (TH32) 6: Plate HEX liquid pipe thermistor (TH6) 7: Ambient temp. thermistor (TH7) 8: Heatsink thermistor (TH8) 4: Discharge thermistor (TH4) 3: Suction pipe thermistor (TH33) 34: Comp. surface thermistor (TH34)

1ON2 3 4 5 6

Error thermistor display

When there is no error thermistor, “–“ is displayed.

Code

display

The black square (

■) indicates a switch position.

OCH562

Outdoor heatsink temperature (TH8) when error occurred.

- 40 to 200

- 40 to 200 (When the temperature is 0°C or less, “–” and temperature are displayed by turns.) (When the temperature is 100°C or more, hundreds digit, tens digit and ones digit are displayed by turns.)

1ON2 3 4 5 6

0 to 255 (When the temperature is 100°C or more, hundreds digit, tens digit and ones digit are displayed by turns.) (Example) When 150°C;

0.5 secs. 0.5 secs. 2 secs.

1ON2 3 4 5 6

Discharge superheat (SHd) when error occurred. 0 to 255

Cooling and Heating: SHd=TH4-T

63HS

SW2 setting

Display detail

Explanation for display Unit

Sub cool (SC) when error occurred. 0 to 130

Cooling: SC = T63HS-TH3 Heating: SC = T

63HS-TH6

0 to 130 (When the temperature is 100°C or more, hundreds digit, tens digit and ones digit are displayed by turns.) (Example) When 115°C;

0.5 secs. 0.5 secs. 2 secs.

Compressor operation duration before the unit stops with error 0 to 999

0 to 999 (When it is 100 minutes or more, hundreds digit, tens digit and ones digit are displayed by turns.) (Example) When 415 minutes;

0.5 secs. 0.5 secs. 2 secs.

Maximum frequency when error occurred 0 to 150

0 to 150 (When it is 100 Hz or more, hundreds digit, tens digit and ones digit are displayed by turns. (Example) When 105 Hz;

0.5 secs. 0.5 secs. 2 secs.

Requested capacity step when error occurred 0 to 7

0 to 7

Step

1ON2 3 4 5 6

Minute

1ON2345 6

Compressor frequency control status

The following code will be a help to know the operating status of unit.

•Ten place (left side):

•First digit (Total figure of the corresponding relays

are displayed.)

Code

display

Display

Compressor frequency control

Input current restriction control

Compressor current restriction control

1 2

Display

Compressor frequency control

Discharge temp.control(not to over rise). Condensing temp.control(not to over rise).

1 2

Freezing protection control

Heatsink temp.control(not to over rise).

When the following 3 points are under control; (1) Input current restriction control. (2) Condensing temp. control (not to over rise). (3) Heatsink temp. control (not to over rise).

LED

The black square (■) indicates a switch position.

OCH562

1ON2 3 4 5 6

U9 Error details (To be shown while error call is deferred.)

Code

display

1ON2345 6

Requested capacity step (Q STEP) 0 to 7

0 to 7

Step

SW2 setting

Display detail

Explanation for display Unit

Comp. surface temperature (TH34) 3 to 217

3 to 217 (When the temperature is 100: or more, the hundreds digit, tens digit and ones digit are displayed by turns.) (Example) When 130:;

0.5 secs. 0.5 secs. 2 secs.

1ON2 3 4 5 6

Outdoor suction pipe temperature (TH33)

- 39 to 88

- 39 to 88 (When the temperature is 0°C or less, “–” and temperature are displayed by turns.) (Example) When –15°C;

0.5 secs. 0.5 secs. 2 secs.

The black square (■) indicates a switch position.

Normal Overvoltage error Undervoltage error Input current sensor error L

1-phase open error

Abnormal power synchronous signal PFC/IGBT error Undervoltage

* Display examples for multiple errors: Overvoltage (01) + Undervoltage (02) = 03 Undervoltage (02) + Power-sync signal error (08) = 0A L

1 phase open error (04) + PFC/IGBT error (20) = 24

Description Display

00 01 02

OCH562

Model name： [Serial No. ]：

Date

：

SW2 setting

1:ON / 0:OFF

SW2 setting

1:ON / 0:OFF

123456 123456

)edoM(derrucco rorre eht nehw edom noitarepO/erutarepmet retaw teltuO/telnI 010100

)edoC(]tsetaL[ )1( yrotsih rorrE/erutarepmet riA teltuO/telnI roodtuO 011100

)edoC()2( yrotsih rorrE/erutarepmet noitcuS/egrahcsiD 111100

)edoC(]tsedlO[ )3( yrotsih rorrE/erusserp noitcuS/egrahcsiD 000101

)edoC()1( yrotsih rorre derrefeD/) zH / V ( ycneuqerF/egatloV ylppus rewoP 100100

)edoC()2( yrotsih rorre derrefeD) nim/L

( emuloV wolf retaW 011001

Inlet water temp. [TH32] 001110 Deferred error history (3) (Code) 11100

Plate HEX liquid pipe temp. [TH6] 001010 Condensing temp.

63HS

]

111101

Condensing temp.

63HS

]

101010 Plate HEX liquid pipe temp. [TH6] 011101

Ambient temp. [TH7] 101110 Compressor running frequency (Hz) 010101

Compressor running frequency (Hz) 111000 Fan steps (Step) 110101

Fan steps (Step) 110000 Liquid pipe temp. [TH3] 110100

Liquid pipe temp. [TH3] 100000 Discharge temp. [TH4] 001100

Discharge temp. [TH4] 010000 LEV-A opening pulse [LEV-A] 001101

LEV-A opening pulse [LEV-A] 000100 LEV-B opening pulse [LEV-B] 100010

LEV-B opening pulse [LEV-B] 010001 Ambient temp. [TH7] 100011

Water inlet temp. [TH32] 000011

Requested capacity step

STEP

]

101111

Heat sink temp. [TH8] 010011

Comp. surface temp. [TH34] 011111

Calculated max. frequency (Hz) 011011

Suction temp. [TH33] 010111

Sub Cool [ SC ] 001011

Heat sink temp. [TH8] 011110

Compressor operation duration (Min) 101011

Discharge Super Heat [SHd]

[SC]

111110

Requested capacity step

STEP

]

111011

Calculated max. frequency (Hz) 111010

Discharge Super Heat [SHd] 110011

Compressor operation duration (Min) 000010

Compressor running current (A) 101100

Number of defrost cycle 000001

Capacity setting (Code) 010010

Demand capacity (%) 101001

Compressor ON/OFF (×100) 001000

Direct current bus line voltage (V) 001001

Compressor accumulated operation hours

(×10hours)

101000

Compressor running current (A)

000110

error detail history (latest) (Code) 110001

Input current (0.1A) 100001

Check sum (Code) 110111

Compressor frequency control status * 100111 *

Temperature differential code [ΔTj] 000111

sutats noitarepo dedroceRataD noitarepO

Data Sheet for Air to Water Compact type

when error occurred

10ths digit 1:Input current restriction control 1st digit 1:Discharge temp. control 4:Freeze protection control

2:Compressor current restriction control 2:Condensing temp. control 8:Heat sink temp. control

PUHZ-W112VHA(-BS)

Applicable model

OCH562

8-8. FUNCTION OF SWITCHES PUHZ-W112VHA PUHZ-W112VHA-BS

Switch

Function

Selection

Initial setting* Function details Effective timing

Mark No. ON (with) OFF (without)

SW1

1 Forced defrosting ON to start usual setting OFF Switch ON to force defrosting Always

2 To clear error history ON to clear usual setting OFF

Switch ON to clear (erase) the followings: (1)

Check codes and

Suspension ags in RAM

(2)

Check codes and Suspension

ags in EEPROM

Always

3 No function Do NOT use PUHZ-W112VHA OFF –

Always

4 Abnormal disregard Disregard Normal OFF

Check code (P8,UH): Abnormal detection disregard

5 No function Do NOT use PUHZ-W112VHA OFF – –

6 No function Do NOT use PUHZ-W112VHA OFF – –

SW5

Silent setting (FAN) Silent setting (FAN)

usual setting OFF

Fan speed setting in silent mode

Always

2 Silent setting (Hz) Silent setting (Hz) usual setting OFF

Hz setting in silent mode

3 No function Do NOT use PUHZ-W112VHA OFF – –

4 No function Do NOT use PUHZ-W112VHA OFF – –

Defrost control

selection

For high humidity Standard OFF

Switches to optimal defrosting operation for low-temperature and high-humidity regions.

–

6 No function Do NOT use PUHZ-W112VHA OFF – –

SW6

1-3

Model Setting

Model

SW6

1 2 3

W 0 0 1

1=ON, 0=OFF

As shown in the left

table

– –

Single phase /

3 phase

Do NOT use Single phase – – –

5-8 Model Setting 2

Model

SW6

5 6 7 8

W112 0 1 1 0

1=ON, 0=OFF

As shown in the left

table

Make sure to set SW6-5 to 8 correctly

–

SW7 1-6 No function Do NOT use PUHZ-W112VHA OFF – –

SW8

1 Mode selection Energy saving mode Powerful mode OFF – Always

2 Max. current setting

Model

Max. current

OFF ON

W112 29.5A 23.0A

OFF –

When power supply

Separate Interface/Flow temp.controller - outdoor

unit power supplies

Separate power

supply

Outdoor unit power

supply

OFF

Power supply connection method selection

When power supply

SW9 1-4 No function Do NOT use – – – –

All these dip switches on PUHZ-W112VHA are set as shown above. Spare PCBs, however, will be supplied without any settings, which means that all dip switches are switched OFF. When servicing, please make sure to set all switches correctly, referring to the previous PCB which is removed from the unit.

*1. Forced defrosting should be done as follows.

1 Change the DIP SW1-1 on the outdoor controller board from OFF to ON. 2 Forced defrosting will start by the above operation 1 if these conditions written below are satisfied.

• Heat mode setting

• 10 minutes have passed since compressor starts operating or previous forced defrosting is finished.

• Pipe temperature is less than or equal to 8:.

Forced defrosting will finish if certain conditions are satisfied. Forced defrosting can be done if above conditions are satisfied when DIP SW1-1 is changed from OFF to ON. After DIP SW1-1 is changed from OFF to ON, there is no problem if DIP SW1-1 is left ON or changed to OFF again. This depends on the service conditions.

OCH562

1. Removing the service panel and top panel (1) Remove 3 service panel fixing screws (5 × 12) and slide

the hook on the right downward to remove the service panel.

(2) Remove screws (3 for front, 3 for rear/5 × 12) of the top

panel and remove it.

2. Removing the fan motor (MF1, MF2)

(1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) (3) Remove 5 fan grille fixing screws (5 × 12) to detach the

fan grille. (See Photo 1)

(4) Remove a nut (for right handed screw of M6) to detach the

propeller. (See Photo 2)

(5) Disconnect the connectors, CNF1 and CNF2 on controller

circuit board in electrical parts box.

(6) Remove 4 fan motor fixing screws (5 × 20) to detach the

fan motor. (See Photo 3)

3. Removing the electrical parts box

(1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) (3) Disconnect the indoor/outdoor connecting wire and power

supply wire from terminal block. (4) Disconnect the connectors on the controller circuit board. (5) Remove the terminal cover and disconnect the compres-

sor lead wire. (6) Remove 2 electrical parts box fixing screw (4 × 10) and

detach the electrical parts box by pulling it upward. The

electrical parts box is fixed with 2 hooks on the left and 1

hook on the right.

Photo 1

Photo 2

Propeller

Front panel

Nut

Electrical parts box fixing screw

Terminal block (TB1)

Fan motor fixing screws

Fan motor

Fan motor fixing screws

Photo 3

Photo 4

Controller circuit board

Hook (right)

Top panel fixing screws

Top panel

Service panel fixing screws

Service panel

Grille fixing screws

Fan grille

Grille fixing screws

Slide

PUHZ-W112VHA PUHZ-W112VHA-BS

DISASSEMBLY PROCEDURE

Cover panel (front)

OPERATING PROCEDURE

PHOTOS & ILLUSTRATION

OCH562

Photo 5

4. Removing the thermistor <Plate HEX liquid> (TH6) and thermistor <Ambient> (TH7)

(1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) (3) Disconnect the connectors, TH7/6 (red) on the controller

circuit board in the electrical parts box. (4) Loosen the 2 wire clamps on top of the electrical parts box. (5) Loosen the fastener for the lead wire on the controller cir-

cuit board in the electrical parts box. (6) Loosen the cable strap for the lead wire on the bottom of

electrical parts box. (7) Pull out the thermistor <Plate HEX liquid> (TH6) and ther-

mistor <Ambient> (TH7) from the sensor holder.

Note: In case of replacing thermistor <Plate HEX liquid>

(TH6) or thermistor <Ambient> (TH7), replace it together.

5. Removing the thermistor <Discharge> (TH4)

and

thermistor <Comp. surface>

(TH34)

(1) Remove the service panel. (See Photo 1)

(2) Disconnect the connector TH4 (white) on the controller cir-

cuit board in the electrical parts box. (4) Loosen the wire clamp on separator. (5) Loosen the cable strap for the lead wire on the bottom of

electrical parts box. (6) Pull out the thermistor <Discharge> (TH4) from the sensor

holder.

[Removing the thermistor <Comp. surface> (TH34)]

(7) Remove the top damper, then pull out the thermistor

<Comp. surface> (TH34) from the holder of the compres-

sor shell.

Photo 8

Removing the thermistor <Liquid> (TH3) and thermistor

<suction> (TH33)

(1) Remove the service panel. (See Photo 1) (2) Disconnect the connectors TH3 (white) and TH33 (yellow)

on the controller circuit board in the electrical parts box.

(3) Loosen the fastener for the lead wire on the controller cir-

cuit board in the electrical parts box. (4) Loosen the wire clamp and wire clip on separator. (5) Pull out the thermistor <Liquid> (TH3), <Suction> (TH33)

from the sensor holder.

Photo 7

Photo 6

Lead wire of thermistor <Ambient> (TH7)

Sensor holder

High pressure sensor (63HS)

Thermistor <Liquid> (TH3)

Compressor (MC)

4-way value

Thermistor <Plate HEX liquid> (TH6)

Low pressure switch (63L)

Stay

Compressor (MC)

Thermistor <Discharge> (TH4)

Thermistor <Suction> (TH33)

Thermistor <Comp. surface> (TH34)

Top damper

OPERATING PROCEDURE

PHOTOS

OCH562

7. Removing the 4-way valve coil (21S4), and linear expansion valve coil (LEV-A, LEV-B)

(1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1)

[Removing the 4-way valve coil] (See Photo 9)

(3) Remove 4-way valve solenoid coil fixing screw (M4 × 6). (4) Remove the 4-way valve coil by sliding the coil toward you. (5) Disconnect the connector 21S4 (green) on the controller

circuit board in the electrical parts box.

(6) Loosen the fastener for the lead wire on the controller cir-

cuit board in the electrical parts box.

[Removing the LEV coil] (See Photo 10)

(3) Loosen the lead wires fixed to the pipes with bands. (4)

Remove the linear expansion valve coil by sliding the coil upward.

(5) Disconnect the connectors, LEV-A (white) and LEV-B (red)

on the controller circuit board in the electrical parts box.

8. Removing the 4-way valve

(1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) (3) Remove the electrical parts box. (See Photo 4) (4) Remove the cover panel (front).(See Photo 1) (5) Remove the stay. (6) Remove 5 right side panel fixing screws (5 × 12) (4: rear of

the unit/1: right side base) and remove the right side panel. (7) Remove the 4-way valve coil. (See Photo 9) (8) Recover refrigerant. (9) Remove the welded part of 4-way valve.

10. Removing the high pressure switch (63H) (See Photo 9) and the low pressure switch (63L)

(1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) (3) Remove the electrical parts box. (4) Remove the cover panel (front). (See Photo 1) (5) Remove the stay. (6) Remove 5 right side panel fixing screws (5 × 12) (4: rear

of the unit/1: right side base) and remove the right side panel.

(7) Pull out the lead wire of high pressure switch and low

pressure switch. (8) Recover refrigerant. (9) Remove the welded part of high pressure switch and low

pressure switch.

9. Removing LEV

(1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) (3) Remove the electrical parts box. (See Photo 4) (4) Remove the cover panel (front). (See Photo 1) (5) Remove 3 stay fixing screws (4 × 10) and remove the stay. (6)

Remove 5 right side panel fixing screws (5 × 12) (4: rear of

the unit/1: right side base) and remove the right side panel. (7) Remove the LEV coil. (8) Recover refrigerant. (9) Remove the welded part of LEV.

Photo 10

LEV (LEV-A)

Photo 9

High pressure switch (63H)

4-way valve coil fixing screw

4-way valve

LEV (LEV-B)

4-way valve

Heat exchanger

Photo 11

Low pressure switch (63L)

High pressure sensor (63HS)

Notes:

1. Recover refrigerant without spreading it in the air.

2. The welded part can be removed easily by removing the right side panel.

3. When installing the follwing parts, cover it with a wet cloth to prevent it from heating, then braze the pipes so that the inside of pipes are not oxidized;

•

4-way valve (procedure 8), 120°C or more

•

LEV (procedure 9), 120°C or more

•

High pressure switch and low pressure switch (procedure 10),

100°C or more

Refer to the notes below.

Refer to the notes on the right.

OPERATING PROCEDURE

PHOTOS

OCH562

Photo 12

11. Removing high pressure sensor (63HS)

(1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) (3) Pull out the lead wire of high pressure sensor. (4) Remove the 4-way valve coil. (See Photo 9) (5) Recover refrigerant. (6) Remove the welded part of high pressure sensor.

Note 1:

Recover refrigerant without spreading it in the air.

Note 2: The welded part can be removed easily by

removing the right side panel.

Note 3: When installing the high pressure sensor, make

sure to cover it with a wet cloth to prevent it from

heating (100˚C or more), then braze the pipes so

that the inside of pipes are not oxidized.

12. Removing the plate heat exchanger

(1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) (3)

Remove 2 screws (5 × 12) and remove the front cover panel. (4) Remove the electrical parts box. (See Photo 4) (5)

Remove 3 screws (4 × 10) and remove the stay. (6) Remove 5 screws (5 × 12) (4: rear of the unit/1: right side

base) and remove the right side panel. (7) Recover the refrigerant (8) Remove 2 welded pipes of plate heat exchanger inlet and

outlet. (9) Remove 3 plate heat exchanger fixing screws (4

10),

then remove the plate heat exchanger.

Note 1: Recover refrigerant without letting it out in the air. Note 2:

Before removing the thermistor <Inlet water> (TH32),

recover water in the plate heat exchanger.

Photo 13

Plate heat exchanger

Plate heat exchanger fixing screw

Heat exchanger

Plate heat exchanger fixing screw

Low pressure switch (63L)

High pressure sensor (63HS)

OPERATING PROCEDURE

PHOTOS

OCH562

14. Removing the power receiver

(1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) (3) Remove 2 front cover panel fixing screws (5 × 12) and

remove the front cover panel. (4) Remove the electrical parts box. (See Photo 4) (5) Remove 3 stay fixing screws (4 × 10) and remove the stay. (6) Remove 5 right side panel fixing screws (5 × 12) (4: rear

the unit/1: right side base) and remove the right side panel. (7) Recover refrigerant. (8) Remove 4 welded pipes of power receiver inlet and outlet. (9) Remove 2 receiver leg fixing screws (4 × 10).

Note: Recover refrigerant without spreading it in the air.

13. Removing the compressor (MC)

(1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) (3) Remove 2 front cover panel fixing screws (5 × 12) and

remove the front cover panel. (4) Remove the electrical parts box. (See Photo 4) (5) Remove 3 stay fixing screws (4 × 10) and remove the stay. (6)

Remove 5 right side panel fixing screws (5 × 12) (4: rear of

the unit/1: right side base) and remove the right side panel. (7) Remove 3 separator fixing screws (4 × 10) and remove

the separator. (8) Remove the soundproof cover for compressor. (9) Remove the terminal cover and remove the compressor

lead wire.

(10) Recover refrigerant. (11) Remove the 3 points of the compressor fixing nut using a

spanner or a adjustable wrench.

(12) Remove the welded pipe of compressor inlet and outlet

then remove the compressor.

Note: Recover refrigerant without spreading it in the air.

Photo 14

Pipes of power receiver

Compressor (MC)

Terminal cover

Compressor fixing nut

Plate heat exchanger fixing screw

Receiver leg fixing screw

Power receiver

OPERATING PROCEDURE

PHOTOS

OCH562

HEAD OFFICE : TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN

New publication, effective Jun. 2014 Specifications are subject to change without notice.

Mitsubishi PUHZ-W112VHA, PUHZ-W112VHA-BS Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual