Mitsubishi PUHZ-W85VHA2.UK, PUHZ-W85VHA2-BS.UK Service Manual

AIR TO WATER HEAT PUMP

SERVICE MANUAL

R410A

[Model name]

PUHZ-W85VHA2

[Service Ref.]

PUHZ-W85VHA2.UK

August 2009

No. OCH465

Note:

• This manual describes only
service data of outdoor unit.

• RoHS compliant products have
<G> mark on the spec name plate.

PUHZ-W85VHA2-BS

PUHZ-W85VHA2-BS.UK

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

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2
5
7

9
10
11
12
13
42

PUHZ-W85VHA2.UK
PUHZ-W85VHA2-BS.UK

PARTS CATALOG (OCB465)

1

SAFETY PRECAUTION

1-1. ALWAYS OBSERVE FOR SAFETY

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

1-2. CAUTIONS RELATED TO NEW REFRIGERANT

Cautions for units utilizing refrigerant R410A

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.

Tools for R410A
Gauge manifold
Charge hose

Gas leak detector

Torque wrench

Vacuum pump adaptor
Electronic refrigerant

charging scale

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.

Ventilate the room if refrigerant leaks during operation. If refrigerant comes into contact with
a flame, poisonous gases will be released.

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.

2

[1] Cautions for service

(1) Perform service after recovering the refrigerant left in unit completely.
(2) Do not release refrigerant in the air.
(3) After completing service, charge the cycle with specified amount of refrigerant.

[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.)

Unit

Gravimeter

[3] Service tools

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

No. Tool name Specifications

Gauge manifold · Only for R410A

1

· Use the existing fitting

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

Charge hose · Only for R410A

2

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

Electronic scale

3

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

4

Adaptor for reverse flow check · Attach on vacuum pump.

5

Refrigerant charge base

6

Refrigerant cylinder · Only for R410A Top of cylinder (Pink)

7

Refrigerant recovery equipment

8

specifications

—

—

Cylinder with syphon

—

. (UNF1/2)

3

1-3. CAUTIONS FOR REFRIGERANT PIPING WORK

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

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

: 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.

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

(Usable if equipped

with adapter for rever­ se flow)

Can R407C tools be used?

(Usable if equipped

with adapter for rever­ se flow)

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

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.

4

2

SPECIFICATIONS

2-1. SPECIFICATIONS

PUHZ-W85VHA2.UK PUHZ-W85VHA2-BS.UK

1㱢, 230V, 50Hz

Nominal water flow rate (Heating mode) L/min

Heating

icapaC 㷄

(Min.2.70 䌾) 9.00

(A7/W35)

(Min.2.60 䌾) 8.50

Heating

capaC

Wkyti

(A2/W35)

Pressure difference (water circuit) 䇭 )teltuo/t
Heating pump input (based on EN14511) kW

Cooling

(COP) Water temperature (inlet/outlet) +12/+7㷄

(A35/W7)

EER
Power input kW

Cooling

(COP) Outside air temperature (Wet-bulb) + 24㷄

(A35/W18)

EER

Pressure difference (water circuit) 䇭kPa
Cooling pump input (based on EN14511) kW

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

Model name

Running current Heating

Cooling

Power factor Heating

Cooling

(A7/W35) 05-03HCAA
(A35/W7) A
(A7/W35) mm4.04:A%
(A35/W7) mm2.862:B%

PUHZ-W85VHA2(-BS)

Atnerruc.xaM

eR

Linear expansion valve

Compressor

Model
Motor output kW
Start type
Protection devices

Oil (Model) L

WretaehesacknarC

Heat exchanger Air

Water

Plate heat exchanger

Fan Fan(drive)×No.

Fan motor output

Air flow

kW

3

/min

m

(CFM)
Defrost method
Noise level Heating dB

(SPL)

Cooling dB

Dimensions Width mm (in.)

Depth mm (in.)

330 +30

Height mm (in.)

)sbl(gkthgieW

Refrigerant

Quantity kg (lbs)
Guaranteed operating Heating
range (Outdoor) Cooling
Outlet water temp. Heating

(Max in heating, Min in cooling)

Nominal return water

Cooling

Heating
temperature range Cooling

㷄
㷄
㷄
㷄
㷄
㷄

nim/LegnaretarwolfretaW

25.8

4.18

2.15

3.17

2.68

13.5

0.02

21.5

7.50

2.47

3.04

7.50

3.93

1.91
10

0.012

9.38

13.15
98
98

23.0
25

Galvanized plate

Munsell 3Y 7.8/1.1

Hermetic twin rotary

TNB220FLHM1T

1.3

Inverter

HP switch

Discharge thermo

Shell thermo

0.67 (FV50S)

-

Plate fin coil

Propeller fan × 1

0.060
49

(1,730)

Reverse cycle

48
48

*1

*2

*2

950 (37-3/8)

*3

(13+1-3/16)

943 (37-1/8)

79 (174)

R410A

2.4 (5.3)

䌾 +35

-20

*4

䌾 +46

-5
+60

+5

+5 䌾 +59
+8 䌾 +28

10.0 䌾 25.8

*5

Heating(A7/W35)

Heating(A2/W35)

Cooling(A35/W7)

Cooling(A35/W18)

Note: We confirm that our units are tested based on EN14511.

regnahcxetaehetalPsnoitacificepstinuroodtuO

ALFA LAVAL

Ref. IN

(Heating)

mm39:WAezisrekaerB

mm523:HgnisacretuO

mm84:DhsiniflanretxE

Ref. OUT
(Heating)

setalp05lortnoctnaregirf

Maximum outlet water temperature

65

]

㷄

60

55

50

45

Maximum outlet watertemperature [

40

-20 -15 -10 -5 0 5 10

*1 Hot gas with 4-way valve
*2 at distance of 1m from outdoor unit
*3 grill
*4 With the optional air outlet guide, the operation at

-15°C outdoor temperature is possible.

*5 For details of the min. return water temperature at

each water flow rate, refer to the chapter 2-2.

Ambient temperature [㷄]

noitidnocgnitarepolanimoN)ycneuqerF,egatloV,esahP(ylppusrewoP

7+)blub-yrD(erutarepmetriaedistuOWkyt
6+)blub-teW(erutarepmetriaedistuOPOC 㷄

53+/03+)teltuo/telni(erutarepmetretaWWktupnirewoP 㷄

2+)blub-yrD(erutarepmetriaedistuOPOC 㷄
1+)blub-teW(erutarepmetriaedistuOWktupnirewoP 㷄

elni(erutarepmetretaWaPk 䋭/+35㷄

㷄

53+)blub-yrD(erutarepmetriaedistuOnim/L)edomgnilooC(etarwolfretawlanimoN

42+)blub-teW(erutarepmetriaedistuOWkyticapaC 㷄

53+)blub-yrD(erutarepmetriaedistuOWkyticapaC 㷄

81+/32+)teltuo/telni(erutarepmetretaWWktupnirewoP 㷄

W

Water OUT

B

H

Water IN

D

Thermistor

(TH32)

A

5

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

Note: If the value of water flow rate and return water temp. become lower than the available range, it

could cause damage to the parts of unit.

<Heating>

<Applicable Models>

19.0

17.0

15.0

13.0

11.0

9.0

Return water temp []

7.0

5.0

10.0 12.0 14.0 16.0 18.0 20.0 22.0 24.0

Water flow rate [L/min]

Table 1

Available range

•PUHZ-W85VHA2(-BS)

<Cooling>

Return water temp []

15.0

14.0

13.0

12.0

11.0

10.0

9.0

8.0

7.0

6.0

5.0

12.010.0 14.0 16.0

Water flow rate [L/min]

18.0

Table 2

Available range

20.0

22.0 24.0

<Applicable Models>

•PUHZ-W85VHA2(-BS)

6

3

DATA

3-1. NOISE CRITERION CURVES

MICROPHONE

1m

1.5m

PUHZ-W85VHA2(-BS).UK

90

MODE

COOLING

HEATING

UNIT

GROUND

SPL(dB)

48
48

LINE

80

70

60

50

40

30

APPROXIMATE

20

THRESHOLD OF
HEARING FOR
CONTINUOUS

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

NOISE

10

63 125 250 500 1000 2000 4000 8000

BAND CENTER FREQUENCIES, Hz

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

7

3-2. STANDARD OPERATION DATA

Mode

Capacity W 7,500 9,000

Total

Input kW 3.04 2.15

Outdoor unit PUHZ-W85VHA2

Phase, Hz 1, 50

Voltage V 230

Electrical circuit

Current A 13.15 9.38

Discharge pressure MPa 2.81 2.16

Suction pressure MPa 0.73 0.64

Discharge temperature ºC 80 65

Cooling

(A35/W7)

Heating

(A7/W35)

Condensing temperature

Refrigerant circuit

Suction temperature ºC 3 -1

Flow volume L/min 21.5 25.8

Water

Outlet water temperature

conditions

Intake air
temperature

Outdoor

conditions

The unit of pressure has been changed to MPa based on international SI system.
The conversion factor is: 1 (MPa) = 10.2 (kgf/cm²)
We confirm that our units are tested based on EN 14511.

W.B. ºC 24 6

ºC 46 37

ºC 7 35

D.B. ºC 35 7

8

4

OUTLINES AND DIMENSIONS

PUHZ-W85VHA2(-BS).UK

Unit: mm

ISO 228/1-G1 B

24

2-U Shaped notched holes

(Foundation Bolt M10)

Rear Air Intake

19

Installation Feet

417

37028

53

2-12 x 36 oval holes

(Foundation Bolt M10)

Air Discharge

950

Earth terminal

98 269

Detail

Handle for moving

Terminal Connections

Left...Power supply wiring

Right...Controller wiring

Power supply wiring hole

(2-:27 knockout)

Service panel

673

See Detail

34

40119

Side Panel R

Front cover

Drain hole

(5-:33)

175 175600

Please secure the unit firmly

with 4 foundation (M10) bolts.

(Bolts and washers must be

purchased locally.)

Over300

2 SERVICE SPACE 3 FOUNDATION BOLTS

Dimensions of space needed

for service access are

shown in the below diagram.

33030

Side Air Intake

FOUNDATION

<Foundation bolt height>

30

Less than

500

Over

Over10

500

Over

Service space

322

Handle for moving

Side Air Intake

Rear Air Intake

943

Handle for moving

473

Handle for moving

220 145145145

23

219

57

30

81

Over 300mm

FREE

1 FREE SPACE (Around the unit)

The diagram below shows a

basic example.

Explanation of particular details are

given in the installation manuals etc.

Over 10mm

Over 10mm

Over 500mm

9

Water OUT

Handle for moving

Air Intake

Water IN

5 WIRING DIAGRAM

PUHZ-W85VHA2.UK PUHZ-W85VHA2-BS.UK

SYMBOL NAME SYMBOL NAME

TB1

MC
MF1
21S4
SV Solenoid Valve <Bypass Valve>
63H
63HS
TH3
TH4
TH6
TH7
TH8
TH32 Thermistor <Inlet water>
TH33 Thermistor <Comp Surface>
LEV-A, LEV-B
DCL
ACTM
CY1,CY2

P. B.

TABU/V/W
TABS/T

MF1

MS
3

Terminal Block <
Flow temp. controller>

Motor for Compressor
Fan Motor
Solenoid Valve <Four-Way Valve>

High Pressure Switch
High Pressure Sensor

Thermistor <Liquid>

Thermistor <Discharge>
Thermistor <Plate HEX Iiquid>
Thermistor <Ambient>
Thermistor <Heat sink>

Electronic Expansion Valve

Reactor
Active Filter Module
Capacitor
Power Circuit Board
Connection Terminal
Connection Terminal <L/N-Phase>

C. B.

1

7

CNF1
(WHT)

3

2

1

CNDC

(PNK)

CNS

(WHT)

1

3

Power Supply,Interface unit /

<

TH32

TH33

TH7

t°

t°

12

12

TH32

TH33

(BLK)

(YLW)

TRANS

F2

CNAC
(WHT)

2

1

F1

3

4

U/V/W-Phase>

TH6 TH3 TH4

t° t° t° t°

TH7/6

TH3

(RED)

TH4

(WHT)

(WHT)

1

3

63H

(YLW)

CN2

(WHT)

17

F3

F4

TAB P1/ P2
TABN1/N2
DS2, DS3
IPM

N.F.

LI,LO
NI,NO
EI,E2
52C

C.B.

SW1
SW2
SW5
SW6
SW7
SW8
SW10
SV1
CNDM
LED3
F1 F4
X52,X54, X55

63HS

63H

2

7

21S4

(GRN)

11121

63HS

(WHT)

21S4 SV

LEV-A

M

34

LEV-A
(WHT)

CN4

(WHT)

12

2

X52

1313

(BLU)

<

Connection Terminal
Connection Terminal <DC Voltage>
Diode bridge
Power Module

DC Voltage>

Noise Filter Circuit Board
Connection Terminal
Connection Terminal <N-Phase>
Connection Terminal
52C Relay

<

L-Phase>

<

Ground>

Controller Circuit Board
Switch <Function Switch>
Switch

<

Function Switch>

Switch

<

Function Switch>
Switch <Model Select>
Switch <Function Switch>

<

Function Switch>

Switch

<

Model Select>

Switch

<

Connector
Connector <Connection

Connection for Option>

for Option(Contact Input)

LED <Operation/Inspection Indicators>

<

T6.3AL250V>

Fuse
Relay

1 MODEL SELECT

SW6

13

X54

SV1

(GRY)

1

CNMNT

CN52C

(RED)

12

2

12345 6
00101 1

1=ON, 0=OFF

5

SW5

(WHT)

SW8

LED3

1

SW6

SW1

CN3S
(WHT)

CNDM
(WHT)

(WHT)

CN51

LEV-B

M

1613

61

LEV-B

CNVMNT

(RED)

(WHT)

X55

SV2

SW7

SW2

SW10

>

SW10

12
01

1

1

3
1

3
1

5

N. F.

BLU

WHT

NO

LO

52C

P. B .

4

1

CNAF
(WHT)

6

7

1

CN2

IPM

(WHT)

7
1

CN3

(WHT)

2
1

CN5

(RED)

2
1

CN4

(WHT)

2

TABN
TABP

TABP2

RED

TAB U

RED

U

RED

BLK

TH8

t°

2

2

V

DCL

MS
3

TAB V

WHT

BLK

W

WHT

CNDC

(PNK)

MC

L1

TAB W

2

1

L2

ACTM

3

4

WHT

16

TAB T

WHT

TABS

TABP1

BLU

WHT

RED

DS3

DS2

U

TAB N1

BLK

TAB N2

RED

P

N1
N2

WHT

Io

3

1

(RED)

CNAC2

3

1

(WHT)

CNAC1

BLU

RED

N

L

POWER SUPPLY

/ N 230V 50Hz

U

LI

RED

YLW

GRN/YLW

S1

Interface unit /

Flow temp. controller

NI

U

ORN

S2 S3

BLU

BRN

1

2

E2

1

2

EI

(BLK)

CN52C

CN5

(RED)

CY1

CY2

TB1

2

BLK

2

BLK

10

WIRING SPECIFICATIONS6

FIELD ELECTRICAL WIRING (power wiring specifications)

Outdoor unit power supply

Wiring

size (mm²)

Wire No. ×

Circuit rating

*1.A breaker with at least 3.0 mm contact separation in each poles 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.

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

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

2.

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

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

4. Install an earth longer than other cables.

5. Do not construct a system with a power supply that is turned ON and OFF frequently.

ledomtinuroodtuO 85V

htrae,ylppusrewoptinuroodtuO

Interface unit/Flow temp. controller-Outdoor unit *2

Interface unit/Flow temp. controller-Outdoor unit earth *2

Remote controller-Interface unit/Flow temp. controller
Outdoor unit L-N (single)
Interface unit/Flow temp. controller-Outdoor unit S1-S2 *3

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

Remote controller-Interface unit/Flow temp. controller *3

*3

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

25A1*yticapacrekaerBtiucriCtinuroodtuO

3 × Min. 4

3 × 1.5 (polar)

1 × Min. 1.5

2 × 0.3 (Non-polar)

AC 230V

AC 230V

DC 24V

DC 12V

Power supply cables and the cables between Controller and Outdoor unit shall not be lighter than polychloroprene sheathed
fl exible cables. (Design 60245 IEC 57

)

lowed).

cause insuffi cient insulation to ground or a poor electrical contact .

Power supply

Isolator

S1

A-Control

Outdoor Unit

S2

S3

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.

3 poles isolator

S1

Interface unit/

S2

Flow temp. controller

S3

11

REFRIGERANT SYSTEM DIAGRAM7

PUHZ-W85VHA2.UK PUHZ-W85VHA2-BS.UK

Water OUT

Plate HEX

Water IN

TH32

TH6

CHECK/V

CHECK/V

Receiver

Strainer
(#100)

LEV-B

Strainer(#100) Strainer(#100)

REV/V

S/V

Strainer
(#100)

LEV-A

P-Sensor

COMP

CHECK/V

H/P SW

TH4

TH7

TH3

Distributor

TH33

TH8 P/B

Refrigerant flow in heating

Refrigerant flow in cooling

Symbol

COMP

H/P SW

Plate HEX

REV/V

S/V

CHECK/V

P-Sensor

P/B

LEV-A

LEV-B

TH32

TH3

TH4

TH6

TH7

TH8

TH33

Receiver

Part name

Compressor

High pressure switch (63H)

Plate Heat Exchanger

Reversing (4-way) valve (21S4)

Solenoid valve

Check valve

Pressure sensor (63HS)

Power board

Linear expansion valve -A

Linear expansion valve -B

Inlet water temperature thermistor

Liquid temperature thermistor

Discharge temperature thermistor

Plate HEX liquid temperature thermistor

Ambient temperature thermistor

Heatsink temperature thermistor

Comp.shell temperature thermistor

Receiver

Detail

DC inverter twin rotary compressor (Mitsubishi Electric Corporation)

For protection (OFF:4.15MPa)

ACH30 - 50 Plates (Alfa Laval)

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

For production test use

High pressure / Low pressure / For production test use

For calculation of the condensing temperature from high pressure

Inverter power board

Heating:Secondary LEV Cooling:Primary LEV

Heating:Primary LEV Cooling:Secondary LEV

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 accumulation of refrigerant

12

TROUBLESHOOTING8

8-1. TROUBLESHOOTING

<Error code display by self-diagnosis and actions to be taken for service (summary)>

Present and past error 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.

Unit conditions at service

The trouble is reoccurring.

The trouble is not reoccurring.

Error code

Displayed

Not displayed

Logged

Not logged

Actions to be taken for service (summary)

Judge what is wrong and take a corrective action according
to “8-3. Self-diagnosis action table”.

Conduct troubleshooting and ascertain the cause of the
trouble.

Consider the temporary defects such as the work of
protection devices in the refrigerant circuit including
compressor, poor connection of wiring, noise and etc.
Re-check the symptom, and check the installation
environment, refrigerant amount, weather when the

trouble occurred, matters related to wiring

and etc.
Reset error code logs and restart the unit after finishing
service.
There is no abnormality in electrical component,
controller board, and etc.

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, and etc.

.

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 con-

nections 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.)

13

8-3. SELF-DIAGNOSIS ACTION TABLE

<Abnormalities detected when the power is turned on>

Error Code

Abnormal point and detection method

1 No voltage is supplied to termi-

nal block (TB1) of outdoor unit.
a) Power supply breaker is

b) Contact failure or disconnec­c) Open phase (L or N phase)

Case

turned off.
tion of power supply terminal

Judgment and action

1 Check following items.

a) Power supply breaker
b) Connection of power supply terminal

block. (TB1)

c) Connection of power supply terminal

block. (TB1)

None

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

TABT or TABS

3 Electric power is not supplied

—

to outdoor controller circuit
board.
a) Disconnection of connector

(CNDC)

4 Disconnection of reactor (DCL)

5 Disconnection of outdoor noise

filter circuit board or parts fail­ure in outdoor noise filter circuit
board

6 Defective outdoor power circuit

board

7 Defective outdoor controller
circuit board

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 TABT or TABS.
Refer to 8-6.

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.
4 Check connection of reactor. (DCL)

Check connection of “L1” and “L2” on the

active filter module. (ACTM)

Refer to 8-6.
5 a) Check connection of outdoor noise filter

circuit board. Refer to 8-6.
b) Replace outdoor noise filter circuit board.

Refer to 8-6.

6 Replace outdoor power circuit board.

7 Replace controller board (When items

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

F5

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

14

1 Check connection of 63H connector on
outdoor controller circuit board.
Refer to 8-6.

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.

Error Code

EA

Eb

Abnormal point and detection method

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.

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.

Case

Contact failure or miswiring of
Interface unit/Flow temp. controller­outdoor unit connecting wire

Diameter or length of Interface

unit/Flow temp. controller-out­door 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.

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

Diameter or length of Interface

unit/Flow temp. controller-out­door 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.

Judgment and action

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.

The descriptions above, - , are for EA, Eb

and EC.

EC

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.

15

<Abnormalities detected while unit is operating>

Error Code

U1

Abnormal point and detection method

High pressure (High-pressure switch
63H activated)

Abnormal if high-pressure switch 63H is
activated ( w ) during compressor opera­tion.
w 4.15 MPa

63H: High-pressure switch

Case

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

Judgment and action

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 8-8-7.)

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.
6 Replace outdoor controller board.

.

U2

U3

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
(TH33) exceeds 125:.
In the case of high comp. surface tem­perature error, compressor does not restart
unless the thermistor (TH33) becomes less
than 95:.

Open/short circuit of discharge
temperature thermistor (TH4)/comp. sur­face thermistor (TH33)

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 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

(TH33) ] 95:

1 Disconnection or contact
failure of connector (TH4/TH33)

on the outdoor controller circuit

board.

2 Defective thermistor
3 Defective outdoor controller

circuit board

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

1 Check connection of connector (TH4/TH33)

on the outdoor controller circuit board.

Check the lead wire for thermistor (TH4/

TH33). Refer to 8-6.

2

Check resistance value of thermistor (
TH33

) or
(Thermistor/TH4/TH33: Refer to 8-5.)
(SW2: Refer to 8-7.)
3 Replace outdoor controller board.

temperature on LED display.

TH4/

16

Error Code

U4

Abnormal point and detection method

Open/short of outdoor unit thermistors
(TH3, TH32, 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.

Check which unit has abnormality in

its thermistor by switching the mode of
SW2.

(Refer to 8-7.)

Case

1 Disconnection or contact failure

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

(

CN3

2 Defective thermistor
3 Defective outdoor controller

circuit board

)

Judgment and action

1 Check connection of connector (TH3, TH32,

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, TH6, TH7, TH8). Refer to 8-6.

2 Check resistance value of thermistor (TH3,

TH32, TH6, TH7, TH8) or check temperature
on LED display.

(Thermistor/TH3, TH32, TH6, TH7, TH8:

Refer to 8-5.)
(SW2: Refer to 8-7.)

3 Replace outdoor controller circuit board.

U5

U6

Thermistors

Symbol

Thermistor <Liquid temperature>

TH3

Thermistor <Inlet water temperature>

TH32

Thermistor <Plate HEX liquid temperature>

TH6

Thermistor <Ambient temperature>

TH7

Thermistor <Heatsink temperature>

TH8

Temperature of heatsink

Abnormal if heatsink thermistor (TH8)
detects temperature indicated below.
W85V ••••••••••••••••••• 77°C

Power module

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

Name

Open detection Short detection

– 40 or below
– 40 or below
– 40 or below
– 40 or below
– 35 or below

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

1 Defective outdoor power circuit

board

2 Decrease of power supply voltage
3 Loosens, disconnection or

reverse of compressor wiring
connection

4 Defective compressor

90 or above

102 or above

90 or above
90 or above

102 or above

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
error code U4.
5 Check resistance value of thermistor (TH8)

or temperature by microcomputer.
(Thermistor/TH8: Refer to 8-5.)
(SW2: Refer to 8-7.)

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

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

compressor. Refer to 8-6 (Outdoor power

circuit board).
4 Check compressor referring to 8-4.

•V•

W phase) to

U7

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

17

12 Check the installation conditions of
discharge temperature thermistor (TH4).

3 Check the coil of linear expansion valve.
Refer to 8-5.
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.

Error Code

U8

Abnormal point and detection method

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.

Case

1 Failure in the operation of
the DC fan motor
2 Failure in the outdoor circuit
controller board

Judgment and action

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.)

U9

Overvoltage or voltage shortage and
synchronous signal to main circuit

Abnormal if any of followings are detected
during compressor operation;

• Decrease of DC bus voltage to 310V

• Instantaneous decrease of DC bus volt-

age to 200V

• Increase of DC bus voltage to 400V

• Decrease of input current of 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.

* Check U9 error detail (SW2 all ON)
Refer to 8-7.

1 Decrease of power supply volt-

age

2 Disconnection of compressor

wiring

3 Defective power circuit board

4 Disconnection or loose connec-

tion of CN52C

5 Defective ACT module
6 Defective ACT module drive

circuit of outdoor power circuit
board

7 Disconnection or loose connec-

tion of CNAF

8 Defective 52C drive circuit of

outdoor controller circuit board

9 Disconnection or loose
connection of CN5 on the
outdoor power circuit board

0 Disconnection or loose
connection of CN2 on the
outdoor power circuit board

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

•V•W phase) to com-

pressor. Refer to 8-6 (Outdoor power circuit
board).

3 Replace power circuit board.

4 Check CN52C wiring.

5 Replace ACT module.
6 Replace outdoor power circuit board.

7 Check CNAF wiring.

8 Replace outdoor controller circuit board.

9 Check CN5 wiring on the outdoor power cir-

cuit board.

Refer to 8-6.
0 Check CN2 wiring on the outdoor power cir-

cuit board. Refer to 8-6.

Ud

UF

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.

Compressor overcurrent interruption
(When compressor locked)

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

1 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

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

18

1 Check outdoor unit air passage.

23 Turn the power off and on again to check

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

4 Check pressure by microcomputer.
(Pressure sensor/ 63HS)
(SW2: Refer to 8-7.)

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

compressor.

•V•

W phase) to

Refer to 8-6 (Outdoor power circuit board).

3 Check compressor. Refer to 8-4.
4 Replace outdoor power circuit board.
5

~

9 Check water circuit and repair the defect.

Error Code

UH

Abnormal point and detection method

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.)

Case

1 Disconnection of compressor

wiring

2 Defective circuit of current

sensor on outdoor power
circuit board

3 Decrease of power supply volt-

age

Judgment and action

1 Correct the wiring (U

pressor. Refer to 8-6 (Outdoor power circuit
board).

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

•V•

W phase) to com-

UP

E0

or

E4

Compressor overcurrent interruption

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

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

Abnormal if main or sub remote control-

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

(Error code: E0)

Abnormal if sub-remote controller could

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

Abnormal if Interface/Flow temp. con-

troller board can not receive any data
normally from remote controller board or
from other Interface/Flow temp. control­ler board for 3 minutes. (Error code: E4)

Interface/Flow temp. controller board

cannot receive any signal from remote
controller for 2 minutes. (Error code: E4)

Decrease of power supply voltage

1
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

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.

1 Check facility of power supply.
2 Correct the wiring (U•V•W phase) to com-

pressor. Refer to 8-6 (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.

w Before the replacement of the outdoor con-

troller 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.

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 cablex 3 or more.)

• The number of connecting remote control­ler: max. 2 units

When it is not the above-mentioned problem of

~
Diagnose remote controllers.

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

trollers 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 dis-

played, noise may be causing abnormality.

E1

or

E2

Remote controller control board

Abnormal if data cannot be read nor-

mally from the nonvolatile memory of the
remote controller control board.

(Error code: E1)

Abnormal if the clock function of remote

controller cannot be operated normally.

(Error code: E2)

Defective remote controller

19

Replace remote controller.

Error Code

E3

or

E5

Abnormal point and detection method

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

1

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

(Error code: E3)
2

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.
(Error code: E3)

1

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

2

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. (Error code: E5)

Case

1 2 remote controllers are set as

“main.”

(In case of 2 remote controllers)

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 control­ler.

Judgment and action

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.

E6

E8

E9

EF

Ed

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.

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

(1) Abnormal if outdoor controller circuit

board could not receive anything

normally for 3 minutes.

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.

Non defined error code

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

Serial communication error

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

1 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

4 Noise has entered into

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

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

4

Noise has entered into Interface unit/
Flow temp. controller-outdoor unit
connecting wire.

1 Interface unit/Flow temp. con-

troller-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 Noise has entered transmission

wire of remote controller.

2 Noise has entered Interface

unit/Flow temp. controller­outdoor unit connecting wire.

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

* 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.

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.

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.

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.

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.

20

Error Code

P6

Abnormal point and detection method

Freezing/overheating protection is working

(1) Freezing protection

<Cooling mode>
Abnormal if plate heat exchanger pipe
temperature thermistor (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.

stage-f

stage-g

Case

(1) Freezing protection
<Cooling mode>
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)
7 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 refrig-

erant

5 Malfunction of liner expansion

valve

(2) Over heating protection
<Heating mode>
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)

6 Malfunction of liner expansion

valve

Tcond

stage-e

stage-d

stage-c

Judgment and action

(1) Freezing protection
<Cooling mode>

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.

<Heating mode>

12 Check water piping.

3 Check water pump.
4 Correct to proper amount of refrigerant.

5 Check linear expansion valve.

Refer to 8-5.
(2) Over heating protection

<Heating mode>

12 Check water piping.

3 Check water pump.
45 Check operating condition of refrigerant cir-

cuit.

6 Check liner expansion valve.

stage-b

stage-a

P8

-19

-18 -16 -15 -13 -12 -11 -10 -8 -7 -3 -2

Tcond

Pipe temperature

1 Leakage or shortage of
Abnormal if the following conditions are
detected for continuously 3 minutes after
compressor starts operating for 10 minutes.

2 Malfunction of linear

1. Cooling mode

T

63HS-TH7 [ 2: and

TH3-TH7 [ 4: or T

63HS-TH3 < 0: and

3 Refrigerant circuit is clogged

TH32-TH6 [ 0: and
Compressor operation frequency is 61Hz or more.

2. Heating mode

63HS-TH32 [ 2: and

T

w Clogging occurs in the parts

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

T63HS: Condensing temperature of pressure

4 Disconnection of thermistor

sensor (63HS)

Thermistor

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

Ambient temperature (TH7)

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

63 61 59 57 54 51 48

[ ]

1 Check intake superheat.

refrigerant

Check leakage of refrigerant.
2 Check linear expansion valve.

expansion valve

3 After recovering refrigerant, remove water

with foreign objects.

from entire refrigerant circuit under vacuum
more than 1 hour.

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

4 Check temperature display on outdoor

holder.

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

21

Error Code

UE

Abnormal point and detection method

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.

Case

1 Disconnection or contact

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

2 Defective pressure sensor
3 Defective outdoor controller

circuit board

Judgment and action

1 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.)
3 Replace outdoor controller board.

PE

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

8-4. HOW TO CHECK THE PARTS
PUHZ-W85VHA2.UK PUHZ-W85VHA2-BS.UK

Parts name

TH3: Liquid pipe
temperature
TH4: Discharge

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

temperature
TH6: Plate Hex liquid

pipe temperature
TH7: Ambient
temperature
TH8: Heatsink
temperature
TH32: Inlet water
temperature
TH33:
Comp. surface thermistor

Refer to the next page.Fan motor (MF1)

Solenoid valve coil
<Four-way valve>

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

(21S4)

TH4/TH33

TH3
TH6
TH7

TH32

TH8

Normal

160k~410k

4.3k~9.6k

4.4k~9.8k
39k~105k



)

Check points

Normal

Abnormal

12 Check water piping.

3 Check water pump.
4 Check intake superheat.

Check leakage of refrigerant.

Abnormal

Open or short

Compressor
(MC)

U

V

W

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

M

Gray

Orange

Red

Yellow

Black

1
2
3
4
5
6

Solenoid valve coil
<Bypass valve>
(SV)

2350±170

Open or short

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



)

Normal Abnormal

0.88

Open or short

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

Normal

Gray - Black Gray - Red

Gray - Yellow

Gray - Orange

46±3Ω

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

Normal

1450±150

Abnormal

Open or short

22

Abnormal

Open or short

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

Notes



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

· Do not pull out the connector (CNF1) of the motor with the power supply on.
(It may damage the outdoor controller circuit
Self check



Symptom: The outdoor fan does not run.

Check fuse (F5) on outdoor controller
circuit board.

board and fan motor.)

Is the fuse normal?

Yes

Wiring contact check

Check contact of fan motor connector
(CNF1)

Is there contact failure?

No

Power supply check

Measure the voltage on the outdoor controller circuit.
(Remove the connector CNF1.)

No

Yes

Replace fan motor.
Replace

outdoor controller circuit board.

Recover wiring.

TEST POINT VDC DC 280-330 V (between 1 (+) and 4 (-) of CNF1)



Is the voltage normal?

 VCC DC 15 V (between 5 (+) and 4 (-) of CNF1)

Yes

Replace fan motor.

No

Replace outdoor controller circuit board.

Check fan motor rotation.

NG

OK

Replace fan motor.

END

Check fan motor rotation.

NG

OK

END

Replace outdoor controller circuit board.

23

8-5. HOW TO CHECK THE COMPONENTS

<Thermistor feature chart>

Low temperature thermistors

• Thermistor <Liquid pipe> (TH3)

• Thermistor <Plate Hex liquid pipe> (TH6)

• Thermistor <Ambient> (TH7)

50

40

Thermistor R0 = 15k' ± 3%
B constant = 3480 ± 2%

1

R

t =15exp{3480(

0: 15k'
10: 9.6k'

273+t – 273

1

)}

30: 4.3k'

40: 3.0k'
20: 6.3k'
25: 5.2k'

Medium temperature thermistor

• Thermistor <Heatsink> (TH8)
Thermistor R50 = 17k' ± 2%

B constant = 4150 ± 3%

t =17exp{4150(

R

1

273+t – 323

1

)}

0: 180k'
25: 50k'
50: 17k'
70: 8k'
90: 4k'

Resistance (k)

30

20

Resistance (k)

10

0

-20 -10 0 10 20 30 40 50

Temperature ()

200

150

100

50

High temperature thermistor

• Thermistor <Discharge pipe> (TH4)

• Thermistor <Comp. surface> (TH33)

Thermistor R120 = 7.465k' ± 2%
B constant = 4057 ± 2%

1

R

t =7.465exp{4057(

20: 250k'
30: 160k'
40: 104k'
50: 70k'
60: 48k'

1

273+t – 393

)}

70: 34k'
80: 24k'
90: 17.5k'
100: 13.0k'
110: 9.8k'

24

Resistance (k)

500

400

300

200

100

0

25 50 75 100 125

Temperature ()

0

25

50 75 100 120

Temperature ()

Low temperature thermistor

• Thermistor <Inlet water> (TH32)
Thermistor R0 = 15k' ± 2.5%

B constant = 3450 ± 2%

1

R

t =15exp{3450(

0: 15k'
10: 9.6k'

1

273+t – 273

30: 4.3k'
40: 3.0k'

)}

20: 6.3k'
25: 5.2k'

50

40

30

20

Resistance (k)

10

0

-20-10 0 1020304050

Temperature()

<HIGH PRESSURE SENSOR>

Vout (V)

4.5

2.5

0.5

2.5 5
PRESSURE

(MPa)

CONTROLLER BOARD

5V DC

WHT

BLU

Vout

BLK

SENSOR

3

2

1

63HS

- : 5V (DC)
- : Output Vout (DC)

MICRO
COMPUTER

GND

25

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.
<Connection between the outdoor controller board and the linear expansion valve>

Outdoor controller board

DC12V

1

LEV

3

2

M

5

1

6

4

Gray

Orange

Red

Yellow

Black

Drive circuit

3

4

5

6

<Output pulse signal and the valve operation>

OFF

ON

OFF

OFF

Output

5678

OFF

OFF

ON

OFF

OFF

OFF

ON

ON

OFF

ON

ON

OFF

Open

OFF

OFF

OFF

ON

ON

OFF

OFF

ON

Output

(Phase)

1

2

3

4

1

234

ON

ON

OFF

ON

OFF

OFF

OFF

OFF

(2) Linear expansion valve operation

Valve position (capacity)

Close

Connector LEV-A

LEV-B

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.

Extra tightning (about 32 pulse)

500 pulse
Opening a valve
all the way

Pulse number

26

y

(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.

Stopper

Coil

Lead wire

<How to detach the coil>

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.

Main bod

<How to attach the coil>

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.

A

Be sure to attach
the stopper.

A

27

8-6. TEST POINT DIAGRAM
Outdoor controller circuit board
PUHZ-W85VHA2.UK PUHZ-W85VHA2-BS.UK

Communication
power supply
D71 Voltage
24 V DC

CNS

S1-S2: 220-240 V AC

+

–

VCC (TEST POINT 2)

(voltage between pins of C6B): DC 15 V

<CAUTION> TEST POINT 1 is high voltage.

63H

High pressure switch

VDC (TEST POINT 1)

(voltage between pins of C5E)
: DC 280 V-330 V

CNDC

+

DC 280 V -380 V
Connect from out-

}

–

door power circuit
board.

CNAC

2

to 4: Power supply
for outdoor controller
circuit board
(220-240 V AC)
1 to 3:
Power supply for
interface unit/Flow
temp. controller­outdoor unit connec­tion wire
(220-240 V AC)

CN2

Connect to the out­door power circuit
board (CN2).
1-5:
Power circuit board

Transmitting signal
to the 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

–

[

5:

1,2,6,7: +

]

21S4

4-way valve

VSP

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

VFG

(voltage between right
pins of PC5D, pin 3
and pin 4)

TH33

Thermistor
<Comp. shell temperature>

TH32

Thermistor
<Inlet water temperature>

TH6

Thermistor
<Plate Hex liquid
temperature>

TH7

<Ambient temperature>

TH3

Thermistor
<Liquid temperature>

TH4

Thermistor
<Discharge>

63HS

High pressure sensor

SV2

Bypass valve

SV1

Drain hose
heater output

CN4

Transmission
to outdoor
power circuit
board (CN4)

CN52C

Connect to the outdoor noise
filter circuit board. (CN52C)

CNDM

to 2 :Input of low level

1

sound priority mode

SW10

Model select

28

SW2

Operation monitor
function

LEV-A,-B

Linear expansion valve

SW8

Function switch

SW5

Function switch

SW6

Model select

SW1

Forced defrost,
detect history
record reset

SW7

Function switch

Outdoor noise filter circuit board
PUHZ-W85VHA2.UK
PUHZ-W85VHA2-BS.UK

LO, NO
Voltage of 220-240 V AC is output.
Connect to the outdoor power
circuit board (TABS, TABT).

CNAC1, CNAC2
220-240 V AC
Connect to the out­door controller cir­cuit board (CNAC).

EI
Connect to
the earth.

E2
Connect to the
earth.

CN5
Input current
Connect to the
outdoor power
circuit board
(CN5).

LI, NI
Voltage of 220-240 V AC is input.
Connect to the terminal block (TB1).

29

Outdoor power circuit board
PUHZ-W85VHA2.UK
PUHZ-W85VHA2-BS.UK

Brief Check of POWER MODULE
w 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 diode bridge
TABP1-TABS, TABN1-TABS, TABP1-TABT, TABN1-TABT

2. Check of DIP-IPM
P-U, P-V, P-W, N-U, N-V, N-W

CN2
Connect to the outdoor controller circuit board
(CN2)
1-5: Transmitting signal to the 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

CN3
Thermistor (TH8)
<Heatsink>

CN5
Detection of input
current
Connect to the
outdoor noise filter
circuit board (CN5)

CN4
Connect to the
outdoor controller
circuit board (CN4)

CNAF
Connect to ACTM

DIP-IPM

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

TABS/TABT
Connect to the
outdoor noise
filter circuit
board
Voltage among
phases:
220-240 V AC

TABP1
Connect to

ACTM

+

TABN1
Connect to

—

ACTM

TABP2
Connect to the
ACTM

TABU/V/W
Connect to the compressor (MC)
Voltage among phases: 10 V ~180 V AC

30

TABN2
Connect to ACTM

Active filter module
PUHZ-W85VHA2.UK
PUHZ-W85VHA2-BS.UK

P
Connect to the outdoor power
circuit board (TABP2)

L1, L2
Connect to the
DCL (Reactor)

Upper
side

+

Connect to the
outdoor power
circuit board
(TABP1)

Connect to the outdoor

–

power circuit board (TABN1)

Connect to the outdoor
power circuit board (CNAF)

1 : GND
2-1 : 15 V DC
3-1 : Control signal
4, 5 : Not used
6-1 : Control signal

N1
Non-connect

Lower
side

N2
Non-connect

lo
Connect to the outdoor
power circuit board (TABN2)

Connection and internal circuit diagram

(+)

(- )

Tester check points of Active fi lter module

Error condition Normal value (reference)

(–) and Io open less than 1

(–) and L2

P and L2

P and Io

L2 and Io

1.The symptom when the unit is in open error condition is described to determine open error by tester check.

W

2.SW2 setting : Code "20" display

W

short 100k" ~ 1M
open
short 100k" ~ 1M
open
short 100k" ~ 1M
open
short 100k" ~ 1M
open

ON
OFF

16

"

"

1

W

"

1

W

"

1

W

"

1

W

DCL

L1 L2

The unit does not operate (can not be switched ON)

1

The breaker operates

1

The unit does not operate (can not be switched ON) 2U9 Abnormal stop (W2)

1

The breaker operates

1

The unit does not operate (can not be switched ON) 2U9 Abnormal stop (W2)

1

The breaker operates

1

The unit does not operate (can not be switched ON) 2U9 Abnormal stop (W2)

1

The breaker operates

1

The unit does not operate (can not be switched ON) 2U9 Abnormal stop (W2)

1

ACTM

P

+

N1
N2

Io

Symptom when the unit is in trouble

Load

31

8-7. OUTDOOR UNIT OPERATION MONITOR FUNCTION

Operation indicator SW2: Indicator change of self diagnosis

SW2 setting

1ON23456

Display detail

<Digital indicator LED3 working details>

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

Explanation for display Unit

(1) Display when the power supply is ON.

When the power supply is ON, blinking displays by turns.

1 second

interval

Wait for 10 seconds at the longest.

(2) When the display lights (Normal operation)

1 Operation mode display

(Lighting)

LED3

The tens digit : Operation mode

Display Operation Model

O

C
H

d

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

U1

Abnormal high pressure (63H worked)

U2

Abnormal high discharging temperature, shortage of refrigerant

U3

Open/short circuit of discharging thermistor (TH4, TH33)

U4

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

U5

Abnormal temperature of heatsink

U6

Abnormality of power module

U7

Abnormality of superheat due to low discharge temperature
Abnormality in outdoor fan motor

U8

Voltage fault, Input current sensor error

Display

Inspection unit

0 Outdoor unit

U9

Overheat protection

Ud

Compressor overcurrent interruption (When Comp. locked)

UF

Current sensor error, Input overcurrent interruption

UH

Compressor overcurrent interruption

UP

Freezing/overheating protection is working.

P6

Abnormality of pipe temperature

P8

Abnormal pressure of pressure sensor

UE

Abnormality of inlet water temperature

PE

Serial communication error

Ed

The ones digit : Relay output

Display

0
1
2
3
4
5
6
7
8
A

Contents to be inspected (During operation)

Warming-up
Compressor

—
—
—
—
—
—
—

—
ON
ON

Compressor

—
—
—

—
ON
ON
ON
ON

—

—

SW2

1ON23456

4-way valve

—

—
ON
ON

—

—
ON
ON

—
ON

(Initial setting)

Solenoid valve

—

ON

—

ON

—

ON

—

ON

—
—

Display

Contents to be inspected (When power is turned on)

63H connector (yellow) is open.

F5

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

E8

Interface unit/Flow temp. controller-outdoor communication error (Transmitting error) (Outdoor unit)

E9

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

EA

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

Eb

Startup time over

EC

Communication error except for outdoor unit

E0~E7

32

SW2 setting

1ON23456

Display detail

Pipe temperature / Liquid (TH3)
– 40~90

Explanation for display

– 40~90
(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.

10

Unit

:

1ON23456

1ON23456

1ON23456

1ON23456

Discharge temperature (TH4)
3~217

Fan steps
0~10

Compressor ON/OFF
0~9999

Compressor accumulated operation
hours
0~9999

3~217
(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.

1

05

0~10

0~9999
(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.

4

25

0~9999
(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.

2

45

:

Step

100 times

10 hours

1ON23456

1ON23456

1ON23456

1ON23456

1ON23456

Compressor running current
0~50

Compressor running frequency
0~255

0~50

Value after the decimal point will be truncated.

0~255
(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.

LEV-A opening pulse
0~500

0~500
(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.

Deferred error history (1) Deferred error

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

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.

1

1

(SW2)

A

Hz

05

Pulse

50

Code

display

Code

display

1ON23456

33

SW2 setting

1ON23456

Display detail

Pipe temperature/Liquid (TH3) when
error occurred.
– 40~90

Explanation for display Unit

– 40~90
(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.

15

:

1ON23456

1ON23456

1ON23456

1ON23456

Discharge temperature (TH4) when error
occurred.
3~217

Compressor current when error occurred.
0~50

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

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

3~217
(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.

1

30

0~50

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

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

:

A

Code

display

Code

display

1ON23456

1ON23456

1ON23456

Compressor operation duration
0~999

LEV-B opening when error occurred

Capacity settings

0~999
(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.

2

45

0~500
(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.

1

50

The outdoor capacity code is shown as below

Model

PUHZ-W85

Code

14

Minute

Pulse

Code

display

34

SW2 setting

1ON23456

Display detail

Outdoor unit setting information

Explanation for display

• The tens digit (Total display for applied setting)

Setting details

H·P /

Cooling only

Single phase / 3 phase

Display details

0 : H·P 1 : Cooling only

0 :

Single phase

2 :

3 phase

• The ones digit
Setting details

Display details

Unit

Code

display

1ON23456

1ON23456

1ON23456

Plate HEX liquid pipe temperature (TH6)
– 39~88

Condensing temperature (T

63HS

)

– 39~88

Calculated maximum frequency
0~150

Defrosting switch

0 : Normal 1 : For high humidity

(Example) When heat pump, 3 phase and defrosting

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

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

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

0~150
(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.

1

05

:

:

Hz

1ON23456

1ON23456

1ON23456

1ON23456

Water inlet temperature (TH32)
0~100

Ambient temperature (TH7)

-39~88

Outdoor heatsink temperature (TH8)

-40~200

Discharge superheat (SHd)
0~255

Cooling and Heating: SHd = TH4-T63HS

0~100

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

-40~200
(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.)

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

35

:

:

:

°C

SW2 setting

1ON23456

Display detail

Sub cool (SC)
0~130

Cooling: SC = T
Heating: SC = T

63HS-TH3
63HS-TH6

Explanation for display Unit

0~130
(When the SC is 100°C or more, hundreds digit, tens
digit and ones digit are displayed by turns.)

°C

1ON23456

1ON23456

1ON23456

1ON23456

Input current of outdoor unit
0~500

LEV-B opening pulse
0~500

U9 error detail history (latest)

Direct current bus voltage
150~400

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

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

Error details
(No error)
Over voltage

Insufficient
voltage

Input current
sensor error

ACTM error

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

Cause

–

Power PCB

Power PCB

Control PCB

Control PCB

Code

00

01

02

04

20

0.1 A

Pulse

Code

display

V

1ON23456

1ON23456

1ON23456

Capacity save
0 ~ 100

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

Deferred error history (2)
of outdoor unit

Deferred error history (3)
of outdoor unit

0~100
(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.

1

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

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

00

36

%

Code

display

Code

display

SW2 setting

1ON23456

Display detail

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

Explanation for display

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

Unit

Code

display

1ON23456

1ON23456

1ON23456

1ON23456

Error thermistor display
When there is no error thermistor,

“–“ is displayed.

Operation frequency when error occurred.
0~225

Fan step when error occurred.
0~10

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

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)
33: Comp. shell thermistor (TH33)

0~225
(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.

1

05

0~10

0~500
(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.

1

30

Code

display

Hz

Step

Pulse

1ON23456

1ON23456

1ON23456

1ON23456

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

-39~88

Condensing temperature when error
occurred.

-39~88

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

Ambient temperature (TH7) when error
occurred.

-39~88

-39~88
(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.

15

-39~88
(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.

15

0~100

-39~88
(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.

15

:

:

:

:

37

SW2 setting

Display detail

Explanation for display

Unit

1ON23456

1ON23456

1ON23456

1ON23456

Outdoor heatsink temperature (TH8)
when error occurred.

-40~200

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

Cooling and Heating: SHd=TH4-T

63HS

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

Cooling: SC = T63HS-TH3
Heating: SC = T63HS-TH6

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

-40~200
(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.)

0~255
(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.

1

50

0~130
(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.

1

15

0~999
(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.

4

15

:

:

:

Minute

1ON23456

1ON23456

1ON23456

Maximum frequency when
error occurred
0~150

Requested capacity step when error
occurred
0~7

Compressor frequency control status

0~150
(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.

1

05

0~7

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

•Ten place (left side):

Display

Compressor frequency control

Input current restriction control

1

Compressor current restriction control

2

•First digit (Total figure of the corresponding relays
are displayed.)

Display

When the following 3 points are under control;

Compressor frequency control

Discharge temp.control(not to over rise).

1

Condensing temp.control(not to over rise).

2

Freezing protection control

4

Heatsink temp.control(not to over rise).

8

LED

(1) Input current restriction control.
(2) Condensing temp. control (not to over rise).
(3) Heatsink temp. control (not to over rise).



Hz

Step

Code

display

38

SW2 setting

1ON23456

Display detail

Comp. shell temperature (TH33)
3~217

Explanation for display Unit

3~217
(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.

1

30

:

1ON23456

1ON23456

Requested capacity step (Q STEP)
0~7

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

0~7

Error details
(No error)
Over voltage

Insufficient
voltage

Input current
sensor error

ACTM error

Cause

–

Power PCB

Power PCB

Control PCB

Control PCB

Code

00

01

02

04

20

Step

Code

display

39

1:ON / 0:OFF

010100

SW2 setting

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Heat sink temp. [TH8] 010011

Water inlet temp. [TH32]

Calculated max. frequency (Hz) 0 11011

111011

110011

]

STEP

[Q

Sub Cool [ SC ] 001011

Discharge Super Heat [SHd]

Requested capacity step

Compressor operation duration (Min) 101011

Compressor running current (A) 101100

101000

(×10hours)

Capacity setting (Code) 010010

Compressor ON/OFF (×100) 001000

error detail history (latest) (Code) 110001
9U

Check sum (Code) 110111

1:Input current restriction control 1st digit 1:Discharge temp. control 4:Freeze protectioncontrol

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

when error occurred

Compressor accumulated operation hours

10ths digit

Applicable model

1:ON / 0:OFF

123456 123456

SW2 setting

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101010 Plate HEX liquid pipe temp. [TH6] 0 11101

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63HS

[T

Water inlet temp. [TH32] 001110 Deferred error history (3) (Code) 111001

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

Condensing temp.

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

Model name䋺 [Serial No.䋺 ] Date䋺

010000 LEV-A opening pulse [LEV-A] 001101

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

Discharge temp. [TH4]

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

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

011111

101111

]

STEP

[Q

Heatsink temp. [TH8] 011110

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

LEV-A opening pulse [LEV-A] 000100 LEV-B opening pulse [LEV-B] 1 00010

Requested capacity step

Discharge Super Heat [SHd] 111110

Comp. surface temp. [TH33]

Sub Cool [ SC ] 000001

Demand capacity (%) 101001

Calculated max. frequency (Hz) 111010

Compressor operation duration (Min) 000010

0
0
0
1
10

Input current (0.1A) 100001

Compressor frequency control status * 100111 *

Compressor running current (A)

Direct current bus line voltage (V) 001001

Temperature differential code [㰱Tj] 000111

40

8-8. FUNCTION OF SWITCHES
PUHZ-W85VHA2.UK PUHZ-W85VHA2-BS.UK

Switch

Mark No. ON (with) OFF (without)

SW1

SW5

SW6

3~6

Function

Forced

1

defrosting

To clear error

2

3 No function
4 No function
5 No function
6 No function

1

2
3 No function

4 No function
1 Model Setting 1

2

history

Max. fan step

selection

Max. frequency

selection

Defrost control

selection

Model Setting 2

ON to start Usual setting OFF

ON to clear Usual setting OFF

Do NOT use PUHZ-W85VHA2
Do NOT use PUHZ-W85VHA2
Do NOT use PUHZ-W85VHA2
Do NOT use PUHZ-W85VHA2

Middle level Low level

Do NOT use PUHZ-W85VHA2
Do NOT use PUHZ-W85VHA2

Do NOT use PUHZ-W85VHA2

For high
humidity

Model

W85VHA2 1 0 1 1 0 1

1=ON, 0=OFF

Selection

STEP 9 STEP 8

Standard OFF

SW6 SW10

345612

Initial setting* Function details

OFF
OFF
OFF
OFF

OFF Selection of max. fan step at the silent mode Always

OFF
OFF

OFF
OFF

As shown in

the left table

Effective timing

(SW1, 8) /

Note (SW6)

Switch ON to force defrosting When compressor

Switch ON to clear (erase) the followings:

Error codes and Suspension flags in RAM

(1)
(2)

Error codes and Suspension flags in
EEPROM

––

Selection of max. compressor frequency at
the silent mode

––

PCB may be damaged, if switch is ON.

Switch ON to change conditions (standard /
high humidity) to start defrosting

–

is working in heat­ing mode. *1

Off or operating

Always

ON for other mod-

els

–

Make sure to set
SW6-3 to 6 and
SW10-1,2 correctly

SW10

1,2

SW7 1~6 No function Do NOT use

1 Mode selection
2 No function Do NOT use

SW8

Separate

Interface/Flow

3

temp. control­ler-outdoor unit
power supplies

Energy saving

mode

Separate

power supply

PUHZ-W85VHA2

Powerful mode OFF – Always

PUHZ-W85VHA2

Outdoor unit power

supply

OFF – –

OFF – –

OFF Power supply connection method selection

When power supply

ON

<Important Note>
All these dip switches on PUHZ-W85VHA2 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.

41

9

DISASSEMBLY PROCEDURE

PUHZ-W85VHA2.UK PUHZ-W85VHA2-BS.UK

OPERATING PROCEDURE

1. Removing the service panel and top panel

(1) Remove 3 screws (5 × 10) and slide the hook on the right

downward to remove the service panel.

(2) Remove screws (3 for front, 3 for rear/5 × 10) of the top

panel and remove it.

Photo 1

Fan grille

PHOTOS & ILLUSTRATION

Top panel fixing screws

Slide

Service panel

Service panel
fixing screws

Grille fixing screws

Top panel

2. Removing the fan motor (MF1)

(1) Remove the service panel. (See Photo 1.)
(2) Remove the top panel. (See Photo 1.)
(3) Remove 5 screws (5 × 10) 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 connector CNF1 on controller circuit board

in electrical parts box.
(6) Remove 4 screws (5 × 25) to detach the fan motor.
(See Photo 3.)

3. Removing the electrical box
(1) Remove the service panel. (See Photo 1.)
(2) Remove the top panel. (See Photo 1.)
(3) Disconnect the connecting wires from terminal block.
(4) Remove all the following connectors from controller circuit board;

fan motor, linear expansion valve (×2), thermistor<Liquid pipe>,
thermistor <Discharge>, thermistor <Plate HEX Liquid>,
thermistor <Outdoor ambient>, high pressure sensor,
high pressure switch, 4-way valve and bypass valve.
Then remove a screw (4 × 8) from the valve bed to remove

the lead wire.

Pull out the disconnected wire from the electrical parts box.
<Diagram symbol in the connector housing>

• Fan motor (CNF1)

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

• Thermistor <Liquid pipe> (TH3)

• Thermistor <Discharge> (TH4)

• Thermistor <Plate HEX Liquid, Outdoor Ambient> (TH7/6)

• Thermistor <Inlet water> (TH32)

• Thermistor <Comp. shell> (TH33)

• High pressure sensor (63HS)

• High pressure switch (63H)

• Solenoid valve coil <4-way valve> (21S4)

• Solenoid valve coil <Bypass valve> (SV2)
(5) Remove the terminal cover and disconnect the compressor

lead wires.
(6) Remove a 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 2

Propeller

Nut

Front panel fixing screws

Photo 4

Controller circuit board (C.B.)

Front panel

Photo 3

Fan motor fixing screws

Fan motor
fixing screws

Electrical parts box

Electrical parts box
fixing screw
(4 x 10)

Fan
motor
(MF1)

42

OPERATING PROCEDURE

PHOTOS & ILLUSTRATION

4. Removing the thermistor <Plate HEX Liquid> (TH6)

(1) Remove the service panel. (See Photo 1.)
(2) Remove the top panel. (See Photo 1.)
(3) Disconnect the connector TH7/6 (red) on the controller
circuit board.
(4) Loosen the clamps for the lead wire.
(5) Pull out the thermistor <Plate HEX Liquid> (TH6) from
the sensor holder.

Note: In case of replacing thermistor <Plate HEX Liquid>
(TH6), replace it together with thermistor<Outdoor
ambient> (TH7), since they are combined together.
Refer to No.5 below to remove thermistor <Outdoor
ambient>.

5. Removing the thermistor <Outdoor ambient> (TH7)

(1) Remove the service panel. (See Photo 1.)
(2) Remove the top panel. (See Photo 1.)
(3) Disconnect the connector TH7/6 (red) on the controller
circuit board.
(4) Loosen the clamps for the lead wire.
(5) Pull out the thermistor <Outdoor ambient> (TH7) from
the sensor holder.

Note: In case of replacing thermistor <Outdoor ambient>

(TH7), replace it together with thermistor <Plate HEX
Liquid> (TH6), since they are combined together.
Refer to No.4 above to remove thermistor <Plate HEX
Liquid>.

Photo 5

Plate HEX liquid
thermistor (TH6)

Receiver

Photo 6

Sensor holder for outdoor ambient thermistor (TH7)

Outdoor liquid
thermistor (TH3)

Plate heat
exchanger

Plate heat exchanger
fixing screw

6. Removing the thermistor <Liquid pipe> (TH3) and thermis­tor <Discharge> (TH4), thermistor <Comp. shell> (TH33)

(1) Remove the service panel. (See Photo 1.)
(2) Disconnect the connectors, TH3 (white), TH4 (white), and

TH33 (yellow) on the controller circuit board.
(3) Loosen the clamps for the lead wire.
(4) Pull out the thermistor <Liquid pipe> (TH3) (See Photo 5.)

and thermistor <Discharge> (TH4) from the sensor holder.

[Removing the thermistor <Comp. shell> (TH33)]

(5) Pull out the thermistor <Comp. shell> (TH33) from the

holder of the compressor shell.

7. Removing the thermistor <Inlet Water> (TH32)

(1) Remove the service panel. (See Photo 1.)
(2) Remove 2 screws (5 × 10) and remove the front cover

panel.
(3) Remove 3 stay fixing screws (4 ×

Remove 4 right side panel fixing screws (5

10) and remove the stay.
×

10) and remove

the right side panel.

(4) Disconnect the connector, TH32 (black) on the controller

circuit board.
(5) Loosen the clamp for the lead wire.
(6) Remove the thermistor <Inlet water> (TH32) from the plate

heat exchanger.

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

recover water in the plate heat exchanger.

Photo 7

Discharge ther­mistor (TH4)

Photo 8

Plate heat
exchanger

Inlet water
thermistor (TH32)

43



OPERATING PROCEDURE

PHOTOS & ILLUSTRATION

8. Removing the solenoid valve coil <4-way valve> (21S4)

linear expansion valve coil (LEV (A), LEV (B)) and solenoid
valve coil <Bypass valve> (SV)

(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.)
[Removing the solenoid valve coil <4-way valve> ]
(4) Remove solenoid valve coil <4-way valve> fixing screw

(M4 × 6).
(5) Remove the solenoid valve coil <4-way valve>.
(6) Disconnect the connector 21S4 (green) on the controller

circuit board.
[Removing the linear expansion valve coil]
(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.
[Removing the solenoid valve coil <Bypass valve>]
(4) Remove the solenoid valve coil <Bypass valve> fixing

screw (M4 × 6).
(5) Remove the solenoid valve coil <Bypass valve> by sliding

the coil upward.
(6) Disconnect the connector SV2 (blue) on the controller cir-

cuit board.

9. 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 3 stay fixing screws (4 × 10) and remove the stay.
(5) Remove 3 right side panel fixing screw (5 × 10) in the rear
of the unit and remove the right side panel.
(6) Remove the solenoid valve coil <4-way valve>.
(See Photo 9.)
(7) Recover refrigerant.
(8) Remove the welded part of 4-way valve.

Photo 9

4-way
valve coil (21S4)

High pressure
switch

Photo 10

4-way valve

Bypass
valve coil (SV)

4-way
valve coil (21S4)

LEV-A

LEV-B

Bypass valve

Note 1: Recover refrigerant without letting it out in the air.
Note 2: The welded part can be removed easily by remov-

ing the right side panel.

Note 3: When installing the 4-way valve, make sure to

cover it with a wet cloth to prevent it from heating
(120°C or more), then braze the pipes so that the
inside of pipes are not oxidized.

10

. Removing linear expansion 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 3 stay fixing screws (4 × 10) and remove the stay.
(5) Remove 3 right side panel fixing screw (5 × 10) in the rear

of the unit and then remove the right side panel.
(6) Remove the linear expansion valve.
(7) Recover refrigerant.
(8) Remove the welded part of linear expansion valve.

Note 1: Recover refrigerant without spreading it in the air.
Note 2: The welded part can be removed easily by remov-

ing the back panel.

Note 3:

When installing the linear expansion valve, cover it

with a wet cloth to prevent it from heating (120 °C
or more), then braze the pipes so that the inside of
pipes are not oxidized.

Stay fixing
screw

Stay fixing
screw

4-way
valve

Stay fixing screw

44

OPERATING PROCEDURE

PHOTOS & ILLUSTRATION

11. Removing the bypass 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 3 right side panel fixing screws (5 × 10) in the rear

of the unit and remove the right side panel.
(5) Remove the bypass valve solenoid coil.
(6) Recover refrigerant.
(7) Remove the welded part of bypass valve.

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

Note 3: When installing the bypass valve, make sure to

12

. Removing the high pressure switch (63H)

(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 3 right side panel fixing screws (5 × 10) in the rear

(5) Pull out the lead wire of high pressure switch.
(6) Recover refrigerant.
(7) Remove the welded part of high pressure switch.

The welded part can be removed easily by removing

the right side panel.

cover it with a wet cloth to prevent it from heating
(120°C or more), then braze the pipes so that the
inside of pips are not oxidized.

of the unit and remove the right side panel.

Photo 11

Solenoid
valve coil (21S4)

High pressure
switch

4-way valve

Solenoid
valve coil (SV)

Bypass valve

LEV-A

High pressure
sensor

LEV-B

Note 1: Recover refrigerant without letting it out in the air.
Note 2: The welded part can be removed easily by remov-

ing the right side panel.

Note 3: When installing the high pressure switch, 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.

13. Removing the high pressure sensor (63HS)

(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 3 right side panel fixing screws (5 × 10) in the rear

of the unit and remove the right side panel.
(5) Pull out the lead wire of high pressure sensor.
(6) Recover refrigerant.
(7) Remove the welded part of high pressure sensor.

Note 1: Recover refrigerant without letting it out in the air.
Note 2: The welded part can be removed easily by remov-

ing 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.

45

OPERATING PROCEDURE

PHOTOS & ILLUSTRATION

14. Removing the compressor (MC)

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

Remove 2 screws (5 × 10) and remove the front cover panel.

(3)
(4)

Remove 2 screws (5 × 10) and remove the back cover panel.

(5) Remove the electrical parts box. (See Photo 4.)

Remove 3 screws (4 × 10) and remove the stay. (See Photo 10.)

(6)
(7) Remove 3 screws (5 × 10) in the rear of the unit and

remove the right side panel.

(8) Remove 5 screws (1:4 × 10 4:5 × 10) and remove the front

panel.

(9) Remove 3 screws (4 × 10) and remove the separator.

10

) Remove the terminal cover and remove the lead wire for

(

compressor.

11

) Remove the soundproof cover for compressor.

(

12

) Recover refrigerant.

(

13

) Remove the 3 points of the compressor fixing nut using a

(

spanner or a adjustable wrench.

14

) Remove the welded pipe of the compressor, then remove

(

the compressor.

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

15. Removing the receiver

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

Remove 2 screws (5 × 10) and remove the front cover panel.

(3)
(4)

Remove 2 screws (5 × 10) and remove the back cover panel.

(5) Remove the electrical parts box. (See Photo 4.)

Remove 3 screws (4 × 10) and remove the stay. (See Photo 10.)

(6)
(7) Remove 3 screw (5 × 10) in the rear of the unit and remove

the right side panel.
(8) Recover the refrigerant.
(9) Remove 2 welded pipes of receiver.

10

) Remove 2 receiver leg fixing screws (4 × 10), then remove

(

the receiver.

Photo 12

Lead wire for
compressor

Compressor
(MC)

Photo 13

Terminal cover

Compressor
fixing nut

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

16

. Removing the plate heat exchanger

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

Remove 2 screws (5 × 10) and remove the front cover panel.

(3)
(4)

Remove 2 screws (5 × 10) and remove the back cover panel.

(5) Remove the electrical parts box. (See Photo 4.)

Remove 3 screws (4 × 10) and remove the stay. (See Photo 10.)

(6)
(7) Remove 3 screw (5 × 10) in the rear of the unit and remove

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

outlet.

10

) Remove 2 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.

Compressor
fixing nut

Photo 14

Plate HEX liquid
thermistor (TH6)

Receiver

Receiver
leg fixing
screw

Outdoor liquid
thermistor (TH3)

Plate heat
exchanger

Plate heat exchanger
fixing screw

46

OPERATING PROCEDURE

17. Removing the controller circuit board (C.B.): Figure 1

(1)

Remove all lead wire connectors on controller circuit board (C.B.).
CNF1, CNDC, CNAC, CN2, CN4, CN52C,
21S4, SV2, 63H, 63HS, LEV-A, LEV-B,
TH32, TH7/6, TH3, TH4
(2)

Remove controller circuit board from the C.B. base. (5 supports)

18.

Removing the noise filter circuit board (N.F.): Figure 1, Photo 15

(1) Remove E2, CN5, LO, NO lead wire connectors from noise

filter circuit board (N.F.).
(2) Remove E1 lead wire connector from electrical parts box.
(3)

Remove L, N lead wire connectors from terminal block (TB1).
(4) Remove 4 screws (4 × 10) for fixing the C.B. base and

detach the C.B. base from the electrical parts box.
(5) Remove CNAC1, CNAC2, E1, LI, NI lead wire connectors
from noise filter circuit board (N.F.).
(6) Remove noise filter circuit board from the C.B. base.
(11 supports)

19.

Removing the power circuit board (P.B.) : Figure 1, Photo 16

(1) Remove CN2, CN4, CNDC lead wire connectors from con-

troller circuit board (C.B.).
(2) Remove LO, NO, CN5 lead wire connectors from noise fil-

ter circuit board (N.F.).
(3)

Remove 4 screws (4 × 10) for fixing the C.B. base and detach

the C.B. base from the electrical parts box.
(4)

Remove all lead wire connectors on power circuit board (P.B.).
CNAF, CN2, CN3, CN5, CN4, CNDC
TABU, TABV ,TAVW, TABT, TABS, TABP1, TABN1, TABN2
(5)

Remove power circuit board from the electrical parts box.
(3 supports and 4 screws ( 2 screws (3 × 12) + 2 screws (4

× 18))

20. Removing the active filter module (ACTM): Figure 1, Photo 16

(1) Remove CN2, CN4, CNDC lead wire connectors from con-

troller circuit board (C.B.).
(2) Remove LO, NO, CN5 lead wire connectors from noise fil-

ter circuit board (N.F.).
(3)

Remove 4 screws (4 × 10) for fixing the C.B. base and detach

the C.B. base from the electrical parts box.
(4)

Remove all lead wires on active filter module (ACTM).
L1, L2, P, Io, +, -, CNAF (4 wires)
(5)

Remove the active filter module (ACTM) from the electrical

parts box. (2 screws (4

×

14))

21. Removing the reactor (DCL): Figure 1, Figure 2

(1) Remove 4 reactor fixing screws (4 × 10) to detach the

reactor (DCL).
(2) Disconnect L1, L2 lead wire from active filter module

(ACTM). Remove reactor wire from wire support.

22

. Removing the thermistor <HEATSINK> (TH8): Photo 16

(1) Remove CN2, CN4, CNDC lead wire connectors from con-

troller circuit board (C.B.).
(2) Remove LO, NO, CN5 lead wire connectors from noise fil-

ter circuit board (N.F.).
(3)

Remove 4 screws (4 × 10) for fixing the C.B. base and detach

the C.B. base from the electrical parts box.
(4)

Remove all lead wire connectors on power circuit board (P.B.).
CNAF, CN2, CN3, CN5, CN4, CNDC
TABU, TABV, TAVW, TABT, TABS, TABP1, TABN1, TABN2
(5)

Remove power circuit board from the electrical parts box.

(3 supports and 4 screws (2 screws (3 × 12) + 2 screws (4 × 18))
(6) Remove the thermistor <HEATSINK> from the electrical

parts box. (1 screw (3 × 12))

PHOTOS & ILLUSTRATION

Figure 1

Electrical
parts box

Controller
circuit board
(C.B.)

Photo 15

Photo 16

Active filter module (ACTM)

Lead wire
for heatsink
thermistor

(TB1)

Figure 2

Reactor
fixing
screws

Active filter module (ACTM)

Power circuit board (P.B.)

Reactor (DCL)

C.B. base

Noise filter circuit
board (N.F.)

Noise filter circuit board (N.F.)

Power circuit board
(P.B)

Wire supportTerminal block

Reactor
(DCL)

Reactor
fixing
screws

47

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

Copyright 2009 MITSUBISHI ELECTRIC ENGINEERING CO., LTD.
Distributed in Aug. 2009 No. OCH465 PDF 6
Made in Japan

New publication, effective Aug. 2009
Specifications subject to change without notice