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

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

+ 32 hidden pages

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

Specifications and Main Features

Frequently Asked Questions

User Manual