service manual no. obh489 utilized · service manual contents 1. ... indoor unit service manual...

SERVICE MANUAL

CONTENTS

1. TECHNICAL CHANGES ····································32. PART NAMES AND FUNCTIONS······················33. SPECIFICATION·················································44. NOISE CRITERIA CURVES·······························65. OUTLINES AND DIMENSIONS ·························76. WIRING DIAGRAM ············································87. REFRIGERANT SYSTEM DIAGRAM··············108. PERFORMANCE CURVES ······························119. ACTUATOR CONTROL····································22

10. SERVICE FUNCTIONS·····································2311. TROUBLESHOOTING······································2312. DISASSEMBLY INSTRUCTIONS·····················39

Wireless typeModels

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

MUZ-FD25VA -MUZ-FD25VAH -MUZ-FD35VA -MUZ-FD35VAH - E1

E1

E1

E1

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

HFCutilized

R410A

No. OBH489OUTDOOR UNIT

Indoor unit service manualMSZ-FD•VA Series (OBH488)

PARTS CATALOG (OBB489)

OBH489--1.qxp 07.8.9 11:53 AM

http://planetaklimata.com.ua

http://planetaklimata.com.ua

2

OBH489--1.qxp 07.8.9 11:53 AM

3

TECHNICAL CHANGES1

PART NAMES AND FUNCTIONS2

ACCESSORIES

Air outlet

Drain outlet

Piping

Drain hose

Air inlet

MUZ-FD25/35VA

1 Drain socket 1

MUZ-FD25VAMUZ-FD25VAHMUZ-FD35VAMUZ-FD35VAH

MUZ-FD25VA -MUZ-FD25VAH -MUZ-FD35VA -MUZ-FD35VAH - E1

E1

E1

E1

1.New model

OBH489--1.qxp 07.8.21 9:54 AM

4

3 SPECIFICATION

3.2 (1.5-5.5)

MUZ-FD25VA

3.5 (1.1-4.0)4.0 (1.5-6.3)

8508653.94.095944.0

4.124.62

3.313.33

4.0 (1.3-7.7)

8358503.83.996953.9

4.194.71

3.213.23

Power outlet

Power input ✽1 (Total)

Running current ✽1 (Total)

Power factor ✽1 (Total)

Starting current ✽1 (Total)

kW

A

W

A

%

A

W

A

A

mmkgr/h

K /h

dB(A)

rpm

kg

Compressor

Spe

cial

rem

arks

Coefficient of performance(C.O.P) ✽1(Total)

Ele

ctric

al d

ata

MUZ-FD35VAMUZ-FD25VAH MUZ-FD35VAH

Single phase230 V, 50 Hz

15

SNB130FGBH900

RC0J50-EA

800o550o28536

2,016/1,776/1,386

870/770/6103

1.15NEO22

Power supply

Outdoor model

Capacity Rated frequency(Min.-Max.)CoolingHeating

CoolingHeatingCoolingHeatingCoolingHeating

CoolingHeating

CoolingHeating

CoolingHeating

CoolingCoolingHeatingCoolingHeatingCoolingHeating

DehumidificationAir flow ✽1 (High/Low) (High/Med./Low)

Sound level ✽1

Fan speed (High/Low) (High/Med./Low)Fan speed regulatorRefrigerant filling capacity(R410A)Refrigeration oil (Model)

Dimensions WOHODWeight

Fan motor

Model

Current ✽1

ModelOutput

Current ✽1

2.5 (1.1-3.5)

4856102.42.988912.9

5.155.25

1.882.30

0.270.30

1.41,872/1,086

46

810/490

3.2 (1.5-6.3)

0.320.35

2.01,872/1,086

4750

810/490

3.5(0.8-4.0)

NOTE : Test conditions are based on ISO 5151Cooling : Indoor Dry-bulb temperature 27 : Wet-bulb temperature 19 :

Outdoor Dry-bulb temperature 35 :Heating : Indoor Dry-bulb temperature 20 :

Outdoor Dry-bulb temperature 7 : Wet-bulb temperature 6 :Refrigerant piping length (one way): 5 m✽1 Measured under rated operating frequency

OBH489--1.qxp 07.8.9 11:53 AM

5

ModelItem

Current

transformer

Smoothing capacitor

Diode module

Fuse

Defrost heater

Intelligent power module

Expansion valve coil

Reactor

Current-detecting

resistor

Current-limiting PTC thermistor

Terminal block

Relay

R.V.coil

Heater protector

IGBT

MUZ-FD25VA

(CT)

(CT761, CT781)

(C61, C62, C63)

(DB61)

(DB65)

(F61)

(F701,F801,F901)

(H)

(IPM)

(LEV)

(L61)

(R61,R62)

(R825)

(R937,R938,R939)

(PTC64,PTC65)

(TB1,TB2)

(X63)

(X64)

(X66)

(21S4)

(26H)

(TR821)

MUZ-FD25VAH MUZ-FD35VA MUZ-FD35VAH

—

—

—

230 V 130 W

3 A 250 V

Open 45 :

—

—

—

230 V 130 W

3 A 250 V

Open 45 :

20 A

15 A

620 + 420 V

15 A 600 V

25 A 600 V

T20AL250V

T3.15AL250V

20 A 600 V

DC 12 V

23.0 mH

180 m" 5 W (2 elements)

25 m" 5 W

430 m" 2 W

33 "

3P

3 A 250 V

20 A 250 V

AC 220 - 240 V

30 A 600 V

Specifications and rating conditions of main electric parts

OBH489--1.qxp 07.8.9 1:31 PM

6

4 NOISE CRITERIA CURVES

90

80

70

60

50

40

30

20

1063 125 250 500 1000 2000 4000 8000

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

OC

TAV

E B

AN

D S

OU

ND

PR

ES

SU

RE

LE

VE

L, d

B r

e 0.

0002

MIC

RO

BA

R

BAND CENTER FREQUENCIES, Hz

COOLING

FUNCTION SPL(dB(A)) LINE

HEATING46

NC-10

MUZ-FD25VAMUZ-FD25VAH

90

80

70

60

50

40

30

20

1063 125 250 500 1000 2000 4000 8000

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

OC

TAV

E B

AN

D S

OU

ND

PR

ES

SU

RE

LE

VE

L, d

B r

e 0.

0002

MIC

RO

BA

R

BAND CENTER FREQUENCIES, Hz

COOLING

FUNCTION SPL(dB(A)) LINE

HEATING

47

50

Test conditions Cooling : Dry-bulb temperature 35 : Heating : Dry-bulb temperature 7 : Wet-bulb temperature 6 :

OUTDOOR UNIT

MICROPHONE

1 m

NC-10


OBH489--1.qxp 07.8.9 11:53 AM

7

OUTLINES AND DIMENSIONS5

Unit: mmMUZ-FD25VAMUZ-FD25VAHMUZ-FD35VAMUZ-FD35VAH

10

69

800

302.5

500 Bolt pitch for installation

150

22.3

Handle

550

280

164.

5

99.5 170.5

23Service panel

Service port

285

344.

5 44

400Air in

Air out

Air in

17.5

Bol

t pitc

h fo

rin

stal

latio

n30

4~32

5

40

Liquid refrigerant pipe jointRefrigerant pipe (flared) [6.35

Gas refrigerant pipe jointRefrigerant pipe (flared) [9.52

43-

35-

2 holes 10 X 21

Drain hole [33 (FD25/35VAH)

REQUIRED SPACEBasically open 100 mm or more without any obstruction in front and on both sides of the unit.

350 mm or more200 mm or more

100 mm or more

100 mm or more

Open two sides of left, right, or rear side.

Drain hole [42 (FD25/35VA)

OBH489--1.qxp 07.8.9 11:53 AM

8

6 WIRING DIAGRAM

MUZ-FD25VAMUZ-FD35VA

OBH489--1.qxp 07.8.9 11:53 AM

9

MUZ-FD25VAHMUZ-FD35VAH

OBH489--1.qxp 07.8.9 11:53 AM

10

7 REFRIGERANT SYSTEM DIAGRAM

Unit:mmMUZ-FD25VAMUZ-FD25VAHMUZ-FD35VAMUZ-FD35VAH

Outdoorheatexchanger

Flared connection

DefrostthermistorRT61

DischargetemperaturethermistorRT62

Flared connection

Stop valve(with strainar)

Stop valve(with service port)

Refrigerant flow in cooling

Compressor

4-way valve

Refrigerant flow in heating

Refrigerant pipe [9.52(with heat insulator)

Refrigerant pipe [6.35(with heat insulator)

R.V. coilheating ONcooling OFF

Strainer#100

Capillary tube[3.0✕[1.8✕600(✕2)

LEV

Ambient temperature thermistorRT65

Muffler

Capillary tube[3.0✕[2.0✕240

Outdoor heatexchangertemperature thermistorRT68Muffler

ADDITIONAL REFRIGERANT CHARGE (R410A:g)

Outdoor unit

precharged 14m7m6m5m 11mModel

Refrigerant piping length (one way)

8m 9m 10m 12m 13m 15m 20m

270000 18090 120 150 210 240 300 4501,150

MUZ-FD25VA

MUZ-FD25VAH

MUZ-FD35VA

MUZ-FD35VAH

Max. length A

Max. Heightdifference

B

Indoorunit

Outdoor unit

MAX. REFRIGERANT PIPING LENGTH and MAX. HEIGHT DIFFERENCE

Max. length

A

20

Max. Height difference

B

12

Model

Gas

9.52

Liquid

6.35

Piping size O.D : mmRefrigerant piping : m

MUZ-FD25VAMUZ-FD25VAHMUZ-FD35VAMUZ-FD35VAH

Calculation : Xg=30 g/m ✕ (Refrigerant piping length (m)–7)

NOTE: Refrigerant piping exceeding 7 m requires additional refrigerant charge according to the calculation.

OBH489--1.qxp 07.8.9 11:53 AM

11

8 PERFORMANCE CURVES

The standard specifications apply only to the operation of the air conditioner under normal conditions. Since operating condi-tions vary according to the areas where these units are installed, the following information has been provided to clarify theoperating characteristics of the air conditioner under the conditions indicated by the performance curve.(1) GUARANTEED VOLTAGE

198 ~ 264 V, 50 Hz(2) AIR FLOW

Air flow should be set at MAX.(3) MAIN READINGS

(1) Indoor intake air wet-bulb temperature : °C WB(2) Indoor outlet air wet-bulb temperature : °C WB(3) Outdoor intake air dry-bulb temperature : °C DB(4) Total input: W(5) Indoor intake air dry-bulb temperature : °C DB(6) Outdoor intake air wet-bulb temperature : °C WB(7) Total input : WIndoor air wet/dry-bulb temperature difference on the left side of the following chart shows the difference between theindoor intake air wet/dry-bulb temperature and the indoor outlet air wet/dry-bulb temperature for your reference at service.

}}

Cooling

Heating

How to measure the indoor air wet-bulb / dry-bulb temperature difference1. Attach at least 2 sets of wet and dry-bulb thermometers to the indoor air intake as shown in the figure, and at least 2 sets

of wet and dry-bulb thermometers to the indoor air outlet. The thermometers must be attached to the position where airspeed is high.

2. Attach at least 2 sets of wet and dry-bulb thermometers to the outdoor air intake.Cover the thermometers to prevent direct rays of the sun.

3. Check that the air filter is cleaned.4. Open windows and doors of room.5. Press the EMERGENCY OPERATION switch once (twice) to start the EMERGENCY COOL (HEAT) MODE.6. When system stabilizes after more than 15 minutes, measure temperature and take an average temperature.7. 10 minutes later, measure temperature again and check that the temperature does not change.

MUZ-FD25VA MUZ-FD35VAMUZ-FD25VAH MUZ-FD35VAH

INDOOR UNIT OUTDOOR UNIT

Wet and dry-bulbthermometers

Wet and dry-bulbthermometers

Cooling capacity

0.9

1.0

1.1

1.2

1.3

1.4

1.5

-10 -5 0 5 10 15 20 25 30 35 40 45

Outdoor intake air Dry-bulb temperature(:)

Cap

acit

y co

rrec

tio

n f

acto

rs

26

24

2018

22

Indoor intake air Wet-bulbtemperature(:)

MU

Z-F

D35

VA

MU

Z-F

D35

VA

Hat

Rat

ed fr

eque

ncy

at R

ated

freq

uenc

y

Ind

oo

r ai

r W

et-b

ulb

tem

per

atu

red

iffe

ren

ce (:

)M

UZ

-FD

25V

AM

UZ

-FD

25V

AH

6.5

6.0

5.5

5.1

4.6

4.1

3.7

9.1

8.4

7.7

7.0

6.3

5.7

5.1

8-1. Capacity and input curves

OBH489--1.qxp 07.8.9 3:33 PM

NOTE:The above broken lines are for the heating operation without any frost and defrost operation.

12

0.8

0.9

1.0

1.1

1.2

1.3

-10 -5 0 5 10 15 20 25 30 35 40 45

Outdoor intake air Dry-bulb temperature (:)

Inp

ut

corr

ecti

on

fac

tors

26 24 222018

Indoor intake air Wet-bulbtemperature(:)

at R

ated

freq

uenc

y

MU

Z-F

D35

VA

MU

Z-F

D35

VA

H

at R

ated

freq

uenc

y

Ind

oo

r ai

r W

et-b

ulb

tem

per

atu

red

iffe

ren

ce (:

)

MU

Z-F

D25

VA

MU

Z-F

D25

VA

H

5.5

5.1

4.6

4.1

3.7

3.3

7.7

7.0

6.3

5.7

5.1

4.5

at R

ated

freq

uenc

y

MU

Z-F

D35

VA

MU

Z-F

D35

VA

H

at R

ated

freq

uenc

y

Ind

oo

r ai

r D

ry-b

ulb

tem

per

atu

red

iffe

ren

ce (:

)

MU

Z-F

D25

VA

MU

Z-F

D25

VA

H

17.3

16.0

14.6

13.3

12.0

10.6

9.3

8.0

6.7

5.3

20.9

19.3

17.7

16.1

14.5

12.9

11.3

9.7

8.0

6.4

Outdoor intake air Wet-bulb temperature (:) -20 -15 -10 -5 0 5 10 15

0.4

0.5

0.6

0.7

0.8

0.9

1.0

1.1

1.2

1.3Heating capacity

Cap

acit

y co

rrec

tio

n f

acto

r

152026

Indoor intake air D

ry-bulb temperature (:)

at R

ated

freq

uenc

y

MU

Z-F

D35

VA

MU

Z-F

D35

VA

H

at R

ated

freq

uenc

y

Ind

oo

r ai

r D

ry-b

ulb

tem

per

atu

red

iffe

ren

ce (:

)

MU

Z-F

D25

VA

MU

Z-F

D25

VA

H

17.3

16.0

14.6

13.3

12.0

10.6

9.3

8.0

6.7

5.3

20.9

19.3

17.7

16.1

14.5

12.9

11.3

9.7

8.0

6.4

Outdoor intake air Wet-bulb temperature (:) -20 -15 -10 -5 0 5 10 15

0.4

0.5

0.6

0.7

0.8

0.9

1.0

1.1

1.2

1.3Total input(heating)

Inp

ut

corr

ecti

on

fac

tor

152026

Indoor intake air Dry-bulb temperature (:)

Total input (cooling)

OBH489--1.qxp 07.8.9 11:53 AM

13

Correction of Cooling input

Inpu

t cor

rect

ion

fact

ors

The operational frequency of compressor

Correction of Cooling capacity

Cap

acity

cor

rect

ion

fact

ors



Cap

acity

cor

rect

ion

fact

ors



Inpu

t cor

rect

ion

fact

ors


Correction of Heating input


Correction of Heating capacity

Cap

acity

cor

rect

ion

fact

ors


Correction of Heating capacityC

apac

ity c

orre

ctio

n fa

ctor

s

The operational frequency of compressorIn

put c

orre

ctio

n fa

ctor

s

MUZ-FD25VAHMUZ-FD25VA

MUZ-FD35VA

0 50 100 150(Hz)0.0

0.5

1.0

1.5

0 50 100 150(Hz)0.0

1.0

2.0

3.0

0 50 100 150(Hz)0.0

0.5

1.0

1.5

2.0

0 50 100 150(Hz)0.0

1.0

2.0

3.0

4.0

0 50 100 150(Hz)0.0

0.5

1.0

1.5

0 50 100 150(Hz)0.0

0.5

1.0

1.5

0 50 100 150(Hz)0.0

0.5

1.0

1.5

2.0


Cap

acity

cor

rect

ion

fact

ors



Inpu

t cor

rect

ion

fact

ors



Inpu

t cor

rect

ion

fact

ors


Correction of Heating capacity

Cap

acity

cor

rect

ion

fact

ors


MUZ-FD35VAH


Cap

acity

cor

rect

ion

fact

ors


0 50 100 150(Hz)0.0

1.0

2.0

3.0

0 50 100 150(Hz)0.0

0.5

1.0

1.5

0 50 100 150(Hz)0.0

0.5

1.0

1.5

0 50 100 150(Hz)0.0

1.0

2.0

3.0

0 50 100 150(Hz)0.0

0.5

1.0

1.5

2.0

8-2. Capacity and input correction by operational frequency of compressor

8-3. Test run operation (How to operate fixed-frequency operation)

1. Press EMERGENCY OPERATION switch to COOL or HEAT mode (COOL : Press once, HEAT : Press twice).2. Test run operation starts and continues to operate for 30 minutes.3. Compressor operates at rated frequency in COOL mode or 58Hz in HEAT mode.4. Indoor fan operates at High speed.5. After 30 minutes, test run operation finishes and EMERGENCY OPERATION starts (Operation frequency of compressor

varies).6. To cancel test run operation (EMERGENCY OPERATION), press EMERGENCY OPERATION switch or any button on

remote controller.

OBH489--1.qxp 07.8.9 11:53 AM

14

kgf/F

[Gau

ge]

MP

a [G

auge

]

15 2050

2560

3070 (%)

35(˚C)

323070 (%)

35(˚C)

0.2

0.4

0.6

0.8

1.0

1.2

2

4

6

8

10

12

14 1.4

Ambient temperature(˚C) Ambient humidity(%)

Outdoor low pressure


15 2050

2560

2.5

3.0

3.5

4.0

18

MUZ-FD25VA MUZ-FD25VAH


MUZ-FD35VA

MUZ-FD35VA

kgf/F

[Gau

ge]

MP

a [G

auge

]

0.2

0.4

0.6

0.8

1.0

1.2

2

4

6

8

10

12

14 1.4

15 2050

2560

1.8

2.0

2.2

2.4

18

(A) (A)

Outdoor unit current



15 2050

2560

3070 (%)

35(˚C)

323070 (%)

35(˚C)


15 2050

2560

2.5

3.0

3.5

4.0

18

MUZ-FD35VAH(A)

323070 (%)

35(˚C)

MUZ-FD35VAH

kgf/F

[Gau

ge]

MP

a [G

auge

]

0.2

0.4

0.6

0.8

1.0

1.2

2

4

6

8

10

12

14 1.4


15 2050

2560

3070 (%)

35(˚C)

(A) (A)

Ambient temperature(˚C) Ambient temperature(˚C)

MUZ-FD25VA MUZ-FD25VAH MUZ-FD35VAOutdoor unit current

(A)

Ambient temperature(˚C)

MUZ-FD35VAH6.0

5.5

5.0

4.5

4.05 10 15 20 25(:)

6.0

5.5

5.0

4.5

4.02 5 10 15 20 25(:)

6.0

5.5

5.0

4.5

4.02 5 10 15 20 25(:)

COOL operation1 Both indoor and outdoor unit are under the

same temperature/humidity condition.2 Operation : TEST RUN OPERATION (refer to 8-3.)

Dry-bulb temperature(:) Relative humidity(%)

20 50

25 60

30 70

8-4. Outdoor low pressure and outdoor unit current

1 Condition :

2 Operation : Test run operation (refer to 8-3.)

HEAT operation

Dry bulb temperature (°C)

Indoor

20.0

14.5

2

1

Outdoor

7

6

15

12

20.0

14.5Wet bulb temperature (°C)

NOTE : The unit of pressure has been changed to MPa on the international system of units (SI unit system)The conversion factor is: 1(MPa [Gauge]) =10.2(kgf/ff [Gauge])

OBH489--1.qxp 07.8.9 11:53 AM

15


21 1821 2022 1822 2022 2223 1823 2023 2224 1824 2024 2224 2425 1825 2025 2225 2426 1826 2026 2226 2426 2627 1827 2027 2227 2427 2628 1828 2028 2228 2428 2629 1829 2029 2229 2429 2630 1830 2030 2230 2430 2631 1831 2031 2231 2431 2632 1832 2032 2232 2432 26

INDOOR INDOOR

CAPACITY:2.5(kW) INPUT:485(W)SHF:0.85

21OUTDOOR DB(:)

25 27 30WB(:) Q SHC SHF Q SHC SHF Q SHC SHF Q SHC SHFINPUT INPUT INPUT INPUTDB(:)

1.971.682.091.811.502.201.931.632.322.051.751.442.442.171.881.572.562.302.011.711.352.672.422.141.841.482.792.542.261.981.622.912.662.392.111.762.942.792.522.241.902.942.912.652.382.042.943.032.772.512.17

2.943.062.943.063.192.943.063.192.943.063.193.352.943.063.193.352.943.063.193.353.452.943.063.193.353.452.943.063.193.353.452.943.063.193.353.452.943.063.193.353.452.943.063.193.353.452.943.063.193.353.45

0.670.550.710.590.470.750.630.510.790.670.550.430.830.710.590.470.870.750.630.510.390.910.790.670.550.430.950.830.710.590.470.990.870.750.630.511.000.910.790.670.551.000.950.830.710.591.000.990.870.750.63

388407388407422388407422388407422441388407422441388407422441466388407422441466388407422441466388407422441466388407422441466388407422441466388407422441466

2.812.942.812.943.082.812.943.082.812.943.083.232.812.943.083.232.812.943.083.233.352.812.943.083.233.352.812.943.083.233.352.812.943.083.233.352.812.943.083.233.352.812.943.083.233.352.812.943.083.233.35

1.881.622.001.731.452.111.851.572.221.971.691.392.332.091.811.522.452.201.941.641.312.562.322.061.771.442.672.442.181.901.572.782.562.312.031.712.812.672.432.161.842.812.792.552.291.982.812.912.682.422.11

0.670.550.710.590.470.750.630.510.790.670.550.430.830.710.590.470.870.750.630.510.390.910.790.670.550.430.950.830.710.590.470.990.870.750.630.511.000.910.790.670.551.000.950.830.710.591.000.990.870.750.63

407432407432449407432449407432449466407432449466407432449466490407432449466490407432449466490407432449466490407432449466490407432449466490407432449466490

2.702.852.702.853.002.702.853.002.702.853.003.152.702.853.003.152.702.853.003.153.302.702.853.003.153.302.702.853.003.153.302.702.853.003.153.302.702.853.003.153.302.702.853.003.153.302.702.853.003.153.30

1.811.571.921.681.412.031.801.532.131.911.651.352.242.021.771.482.352.141.891.611.292.462.252.011.731.422.572.372.131.861.552.672.482.251.981.682.702.592.372.111.822.702.712.492.241.952.702.822.612.362.08

0.670.550.710.590.470.750.630.510.790.670.550.430.830.710.590.470.870.750.630.510.390.910.790.670.550.430.950.830.710.590.470.990.870.750.630.511.000.910.790.670.551.000.950.830.710.591.000.990.870.750.63

427441427441461427441461427441461480427441461480427441461480504427441461480504427441461480504427441461480504427441461480504427441461480504427441461480504

2.602.752.602.752.882.602.752.882.602.752.883.052.602.752.883.052.602.752.883.053.202.602.752.883.053.202.602.752.883.053.202.602.752.883.053.202.602.752.883.053.202.602.752.883.053.202.602.752.883.053.20

1.741.511.851.621.351.951.731.472.051.841.581.312.161.951.701.432.262.061.811.561.252.372.171.931.681.382.472.282.041.801.502.572.392.161.921.632.602.502.272.041.762.602.612.392.171.892.602.722.502.292.02

0.670.550.710.590.470.750.630.510.790.670.550.430.830.710.590.470.870.750.630.510.390.910.790.670.550.430.950.830.710.590.470.990.870.750.630.511.000.910.790.670.551.000.950.830.710.591.000.990.870.750.63

446461446461480446461480446461480504446461480504446461480504519446461480504519446461480504519446461480504519446461480504519446461480504519446461480504519

PERFORMANCE DATA COOL operation at Rated frequency

NOTE: Q : Total capacity (kW) SHF : Sensible heat factor DB : Dry-bulb temperatureSHC : Sensible heat capacity (kW) INPUT : Total power input (W) WB : Wet-bulb temperature

OBH489--1.qxp 07.8.9 11:53 AM

16

21 1821 2022 1822 2022 2223 1823 2023 2224 1824 2024 2224 2425 1825 2025 2225 2426 1826 2026 2226 2426 2627 1827 2027 2227 2427 2628 1828 2028 2228 2428 2629 1829 2029 2229 2429 2630 1830 2030 2230 2430 2631 1831 2031 2231 2431 2632 1832 2032 2232 2432 26

35 40 46


OUTDOOR DB(:)INDOOR INDOORDB (:) WB (:) Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT

2.452.582.452.582.732.452.582.732.452.582.732.882.452.582.732.882.452.582.732.883.032.452.582.732.883.032.452.582.732.883.032.452.582.732.883.032.452.582.732.883.032.452.582.732.883.032.452.582.732.883.03

1.641.421.741.521.281.841.621.391.941.731.501.242.031.831.611.352.131.931.721.471.182.232.031.831.581.302.332.141.931.701.422.432.242.041.811.542.452.342.151.931.662.452.452.262.041.782.452.552.372.161.91

0.670.550.710.590.470.750.630.510.790.670.550.430.830.710.590.470.870.750.630.510.390.910.790.670.550.430.950.830.710.590.470.990.870.750.630.511.000.910.790.670.551.000.950.830.710.591.000.990.870.750.63

475495475495514475495514475495514534475495514534475495514534553475495514534553475495514534553475495514534553475495514534553475495514534553475495514534553

2.252.402.252.402.552.252.402.552.252.402.552.702.252.402.552.702.252.402.552.702.852.252.402.552.702.852.252.402.552.702.852.252.402.552.702.852.252.402.552.702.852.252.402.552.702.852.252.402.552.702.85

1.511.321.601.421.201.691.511.301.781.611.401.161.871.701.501.271.961.801.611.381.112.051.901.711.491.232.141.991.811.591.342.232.091.911.701.452.252.182.011.811.572.252.282.121.921.682.252.382.222.031.80

0.670.550.710.590.470.750.630.510.790.670.550.430.830.710.590.470.870.750.630.510.390.910.790.670.550.430.950.830.710.590.470.990.870.750.630.511.000.910.790.670.551.000.950.830.710.591.000.990.870.750.63

504519504519543504519543504519543558504519543558504519543558577504519543558577504519543558577504519543558577504519543558577504519543558577504519543558577

2.082.232.082.232.382.082.232.382.082.232.382.552.082.232.382.552.082.232.382.552.682.082.232.382.552.682.082.232.382.552.682.082.232.382.552.682.082.232.382.552.682.082.232.382.552.682.082.232.382.552.68

1.391.221.471.311.121.561.401.211.641.491.311.101.721.581.401.201.811.671.501.301.041.891.761.591.401.151.971.851.691.501.262.051.941.781.611.362.082.021.881.711.472.082.111.971.811.582.082.202.071.911.69

0.670.550.710.590.470.750.630.510.790.670.550.430.830.710.590.470.870.750.630.510.390.910.790.670.550.430.950.830.710.590.470.990.870.750.630.511.000.910.790.670.551.000.950.830.710.591.000.990.870.750.63

524548524548563524548563524548563582524548563582524548563582601524548563582601524548563582601524548563582601524548563582601524548563582601524548563582601




OBH489--1.qxp 07.8.9 11:53 AM

17

21 1821 2022 1822 2022 2223 1823 2023 2224 1824 2024 2224 2425 1825 2025 2225 2426 1826 2026 2226 2426 2627 1827 2027 2227 2427 2628 1828 2028 2228 2428 2629 1829 2029 2229 2429 2630 1830 2030 2230 2430 2631 1831 2031 2231 2431 2632 1832 2032 2232 2432 26

INDOOR INDOOR


21OUTDOOR DB(:)


4.114.294.114.294.464.114.294.464.114.294.464.694.114.294.464.694.114.294.464.694.834.114.294.464.694.834.114.294.464.694.834.114.294.464.694.834.114.294.464.694.834.114.294.464.694.834.114.294.464.694.83

2.762.362.922.532.103.082.702.283.252.872.452.023.413.042.632.203.583.222.812.391.883.743.392.992.582.083.913.563.172.772.274.073.733.352.952.464.113.903.533.142.664.114.073.703.332.854.114.243.883.523.04

0.670.550.710.590.470.750.630.510.790.670.550.430.830.710.590.470.870.750.630.510.390.910.790.670.550.430.950.830.710.590.470.990.870.750.630.511.000.910.790.670.551.000.950.830.710.591.000.990.870.750.63

680714680714740680714740680714740774680714740774680714740774816680714740774816680714740774816680714740774816680714740774816680714740774816680714740774816

3.944.113.944.114.313.944.114.313.944.114.314.523.944.114.314.523.944.114.314.524.693.944.114.314.524.693.944.114.314.524.693.944.114.314.524.693.944.114.314.524.693.944.114.314.524.693.944.114.314.524.69

2.642.262.802.432.022.952.592.203.112.762.371.943.272.922.542.123.433.082.712.301.833.583.252.882.482.023.743.413.062.662.203.903.583.232.842.393.943.743.403.032.583.943.913.573.212.773.944.073.753.392.95

0.670.550.710.590.470.750.630.510.790.670.550.430.830.710.590.470.870.750.630.510.390.910.790.670.550.430.950.830.710.590.470.990.870.750.630.511.000.910.790.670.551.000.950.830.710.591.000.990.870.750.63

714757714757786714757786714757786816714757786816714757786816859714757786816859714757786816859714757786816859714757786816859714757786816859714757786816859

3.783.993.783.994.203.783.994.203.783.994.204.413.783.994.204.413.783.994.204.414.623.783.994.204.414.623.783.994.204.414.623.783.994.204.414.623.783.994.204.414.623.783.994.204.414.623.783.994.204.414.62

2.532.192.682.351.972.842.512.142.992.672.311.903.142.832.482.073.292.992.652.251.803.443.152.812.431.993.593.312.982.602.173.743.473.152.782.363.783.633.322.952.543.783.793.493.132.733.783.953.653.312.91

0.670.550.710.590.470.750.630.510.790.670.550.430.830.710.590.470.870.750.630.510.390.910.790.670.550.430.950.830.710.590.470.990.870.750.630.511.000.910.790.670.551.000.950.830.710.591.000.990.870.750.63

748774748774808748774808748774808842748774808842748774808842884748774808842884748774808842884748774808842884748774808842884748774808842884748774808842884

3.643.853.643.854.033.643.854.033.643.854.034.273.643.854.034.273.643.854.034.274.483.643.854.034.274.483.643.854.034.274.483.643.854.034.274.483.643.854.034.274.483.643.854.034.274.483.643.854.034.274.48

2.442.122.582.271.892.732.432.052.882.582.211.843.022.732.372.013.172.892.542.181.753.313.042.702.351.933.463.202.862.522.113.603.353.022.692.283.643.503.182.862.463.643.663.343.032.643.643.813.503.202.82

0.670.550.710.590.470.750.630.510.790.670.550.430.830.710.590.470.870.750.630.510.390.910.790.670.550.430.950.830.710.590.470.990.870.750.630.511.000.910.790.670.551.000.950.830.710.591.000.990.870.750.63

782808782808842782808842782808842884782808842884782808842884910782808842884910782808842884910782808842884910782808842884910782808842884910782808842884910



MUZ-FD35VA

OBH489--1.qxp 07.8.9 11:53 AM

18

21 1821 2022 1822 2022 2223 1823 2023 2224 1824 2024 2224 2425 1825 2025 2225 2426 1826 2026 2226 2426 2627 1827 2027 2227 2427 2628 1828 2028 2228 2428 2629 1829 2029 2229 2429 2630 1830 2030 2230 2430 2631 1831 2031 2231 2431 2632 1832 2032 2232 2432 26

35 40 46



3.433.613.433.613.823.433.613.823.433.613.824.033.433.613.824.033.433.613.824.034.243.433.613.824.034.243.433.613.824.034.243.433.613.824.034.243.433.613.824.034.243.433.613.824.034.243.433.613.824.034.24

2.301.982.442.131.792.572.271.952.712.422.101.732.852.562.251.892.982.702.402.051.653.122.852.562.211.823.262.992.712.371.993.403.142.862.542.163.433.283.012.702.333.433.423.172.862.503.433.573.323.022.67

0.670.550.710.590.470.750.630.510.790.670.550.430.830.710.590.470.870.750.630.510.390.910.790.670.550.430.950.830.710.590.470.990.870.750.630.511.000.910.790.670.551.000.950.830.710.591.000.990.870.750.63

833867833867901833867901833867901935833867901935833867901935969833867901935969833867901935969833867901935969833867901935969833867901935969833867901935969

3.153.363.153.363.573.153.363.573.153.363.573.783.153.363.573.783.153.363.573.783.993.153.363.573.783.993.153.363.573.783.993.153.363.573.783.993.153.363.573.783.993.153.363.573.783.993.153.363.573.783.99

2.111.852.241.981.682.362.121.822.492.251.961.632.612.392.111.782.742.522.251.931.562.872.652.392.081.722.992.792.532.231.883.122.922.682.382.033.153.062.822.532.193.153.192.962.682.353.153.333.112.842.51

0.670.550.710.590.470.750.630.510.790.670.550.430.830.710.590.470.870.750.630.510.390.910.790.670.550.430.950.830.710.590.470.990.870.750.630.511.000.910.790.670.551.000.950.830.710.591.000.990.870.750.63

8849108849109528849109528849109529788849109529788849109529781012884910952978101288491095297810128849109529781012884910952978101288491095297810128849109529781012

2.913.122.913.123.332.913.123.332.913.123.333.572.913.123.333.572.913.123.333.573.752.913.123.333.573.752.913.123.333.573.752.913.123.333.573.752.913.123.333.573.752.913.123.333.573.752.913.123.333.573.75

1.951.712.061.841.562.181.961.702.292.091.831.542.412.211.961.682.532.342.091.821.462.642.462.231.961.612.762.592.362.111.762.882.712.492.251.912.912.832.632.392.062.912.962.762.532.212.913.082.892.682.36

0.670.550.710.590.470.750.630.510.790.670.550.430.830.710.590.470.870.750.630.510.390.910.790.670.550.430.950.830.710.590.470.990.870.750.630.511.000.910.790.670.551.000.950.830.710.591.000.990.870.750.63

9189619189619869189619869189619861020918961986102091896198610201054918961986102010549189619861020105491896198610201054918961986102010549189619861020105491896198610201054



MUZ-FD35VA

OBH489--1.qxp 07.8.9 11:53 AM

19

21 1821 2022 1822 2022 2223 1823 2023 2224 1824 2024 2224 2425 1825 2025 2225 2426 1826 2026 2226 2426 2627 1827 2027 2227 2427 2628 1828 2028 2228 2428 2629 1829 2029 2229 2429 2630 1830 2030 2230 2430 2631 1831 2031 2231 2431 2632 1832 2032 2232 2432 26

INDOOR INDOOR


21OUTDOOR DB(:)


4.114.294.114.294.464.114.294.464.114.294.464.694.114.294.464.694.114.294.464.694.834.114.294.464.694.834.114.294.464.694.834.114.294.464.694.834.114.294.464.694.834.114.294.464.694.834.114.294.464.694.83

2.762.362.922.532.103.082.702.283.252.872.452.023.413.042.632.203.583.222.812.391.883.743.392.992.582.083.913.563.172.772.274.073.733.352.952.464.113.903.533.142.664.114.073.703.332.854.114.243.883.523.04

0.670.550.710.590.470.750.630.510.790.670.550.430.830.710.590.470.870.750.630.510.390.910.790.670.550.430.950.830.710.590.470.990.870.750.630.511.000.910.790.670.551.000.950.830.710.591.000.990.870.750.63

668701668701726668701726668701726760668701726760668701726760802668701726760802668701726760802668701726760802668701726760802668701726760802668701726760802

3.944.113.944.114.313.944.114.313.944.114.314.523.944.114.314.523.944.114.314.524.693.944.114.314.524.693.944.114.314.524.693.944.114.314.524.693.944.114.314.524.693.944.114.314.524.693.944.114.314.524.69

2.642.262.802.432.022.952.592.203.112.762.371.943.272.922.542.123.433.082.712.301.833.583.252.882.482.023.743.413.062.662.203.903.583.232.842.393.943.743.403.032.583.943.913.573.212.773.944.073.753.392.95

0.670.550.710.590.470.750.630.510.790.670.550.430.830.710.590.470.870.750.630.510.390.910.790.670.550.430.950.830.710.590.470.990.870.750.630.511.000.910.790.670.551.000.950.830.710.591.000.990.870.750.63

701743701743772701743772701743772802701743772802701743772802843701743772802843701743772802843701743772802843701743772802843701743772802843701743772802843

3.783.993.783.994.203.783.994.203.783.994.204.413.783.994.204.413.783.994.204.414.623.783.994.204.414.623.783.994.204.414.623.783.994.204.414.623.783.994.204.414.623.783.994.204.414.623.783.994.204.414.62

2.532.192.682.351.972.842.512.142.992.672.311.903.142.832.482.073.292.992.652.251.803.443.152.812.431.993.593.312.982.602.173.743.473.152.782.363.783.633.322.952.543.783.793.493.132.733.783.953.653.312.91

0.670.550.710.590.470.750.630.510.790.670.550.430.830.710.590.470.870.750.630.510.390.910.790.670.550.430.950.830.710.590.470.990.870.750.630.511.000.910.790.670.551.000.950.830.710.591.000.990.870.750.63

735760735760793735760793735760793827735760793827735760793827868735760793827868735760793827868735760793827868735760793827868735760793827868735760793827868

3.643.853.643.854.033.643.854.033.643.854.034.273.643.854.034.273.643.854.034.274.483.643.854.034.274.483.643.854.034.274.483.643.854.034.274.483.643.854.034.274.483.643.854.034.274.483.643.854.034.274.48

2.442.122.582.271.892.732.432.052.882.582.211.843.022.732.372.013.172.892.542.181.753.313.042.702.351.933.463.202.862.522.113.603.353.022.692.283.643.503.182.862.463.643.663.343.032.643.643.813.503.202.82

0.670.550.710.590.470.750.630.510.790.670.550.430.830.710.590.470.870.750.630.510.390.910.790.670.550.430.950.830.710.590.470.990.870.750.630.511.000.910.790.670.551.000.950.830.710.591.000.990.870.750.63

768793768793827768793827768793827868768793827868768793827868893768793827868893768793827868893768793827868893768793827868893768793827868893768793827868893



MUZ-FD35VAH

OBH489--1.qxp 07.8.9 11:53 AM

20

21 1821 2022 1822 2022 2223 1823 2023 2224 1824 2024 2224 2425 1825 2025 2225 2426 1826 2026 2226 2426 2627 1827 2027 2227 2427 2628 1828 2028 2228 2428 2629 1829 2029 2229 2429 2630 1830 2030 2230 2430 2631 1831 2031 2231 2431 2632 1832 2032 2232 2432 26

35 40 46



3.433.613.433.613.823.433.613.823.433.613.824.033.433.613.824.033.433.613.824.034.243.433.613.824.034.243.433.613.824.034.243.433.613.824.034.243.433.613.824.034.243.433.613.824.034.243.433.613.824.034.24

2.301.982.442.131.792.572.271.952.712.422.101.732.852.562.251.892.982.702.402.051.653.122.852.562.211.823.262.992.712.371.993.403.142.862.542.163.433.283.012.702.333.433.423.172.862.503.433.573.323.022.67

0.670.550.710.590.470.750.630.510.790.670.550.430.830.710.590.470.870.750.630.510.390.910.790.670.550.430.950.830.710.590.470.990.870.750.630.511.000.910.790.670.551.000.950.830.710.591.000.990.870.750.63

818852818852885818852885818852885919818852885919818852885919952818852885919952818852885919952818852885919952818852885919952818852885919952818852885919952

3.153.363.153.363.573.153.363.573.153.363.573.783.153.363.573.783.153.363.573.783.993.153.363.573.783.993.153.363.573.783.993.153.363.573.783.993.153.363.573.783.993.153.363.573.783.993.153.363.573.783.99

2.111.852.241.981.682.362.121.822.492.251.961.632.612.392.111.782.742.522.251.931.562.872.652.392.081.722.992.792.532.231.883.122.922.682.382.033.153.062.822.532.193.153.192.962.682.353.153.333.112.842.51

0.670.550.710.590.470.750.630.510.790.670.550.430.830.710.590.470.870.750.630.510.390.910.790.670.550.430.950.830.710.590.470.990.870.750.630.511.000.910.790.670.551.000.950.830.710.591.000.990.870.750.63

868893868893935868893935868893935960868893935960868893935960994868893935960994868893935960994868893935960994868893935960994868893935960994868893935960994

2.913.122.913.123.332.913.123.332.913.123.333.572.913.123.333.572.913.123.333.573.752.913.123.333.573.752.913.123.333.573.752.913.123.333.573.752.913.123.333.573.752.913.123.333.573.752.913.123.333.573.75

1.951.712.061.841.562.181.961.702.292.091.831.542.412.211.961.682.532.342.091.821.462.642.462.231.961.612.762.592.362.111.762.882.712.492.251.912.912.832.632.392.062.912.962.762.532.212.913.082.892.682.36

0.670.550.710.590.470.750.630.510.790.670.550.430.830.710.590.470.870.750.630.510.390.910.790.670.550.430.950.830.710.590.470.990.870.750.630.511.000.910.790.670.551.000.950.830.710.591.000.990.870.750.63

9029449029449699029449699029449691002902944969100290294496910021035902944969100210359029449691002103590294496910021035902944969100210359029449691002103590294496910021035



MUZ-FD35VAH

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PERFORMANCE DATA HEAT operation at Rated frequency

CAPACITY:3.2(kW) INPUT:610(W)

OUTDOOR WB(:)INDOOR -10 -5 0 5 10 15 20DB(:) Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT

152126

2.021.921.73

397427458

2.432.302.14

476506537

2.852.722.53

537561592

3.263.102.94

580604634

3.683.523.36

616634665

4.063.903.74

634653683

4.484.304.16

647677702



152126

2.522.402.16

562606649

3.042.882.68

675718761

3.563.403.16

761796839

4.083.883.68

822856900

4.604.404.20

874900943

5.084.884.68

900926969

5.605.385.20

917960995


MUZ-FD35VA



152126

2.522.402.16

553595638

3.042.882.68

663706748

3.563.403.16

748782825

4.083.883.68

808842884

4.604.404.20

859884927

5.084.884.68

884910952

5.605.385.20

901944978

MUZ-FD35VAH

NOTE: Q:Total capacity (kW) INPUT:Total power input (W) DB : Dry-bulb temperature WB : Wet-bulb temperature

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9 ACTUATOR CONTROL


9-3. Relation between main sensor and actuator

9-2. R.V. coil controlHeating . . . . . . . . . . . . . . . . ONCooling . . . . . . . . . . . . . . . . OFFDry. . . . . . . . . . . . . . . . . . . . OFFNOTE: The 4-way valve reverses for 5 seconds right before start-up of the compressor.

ON

OFF

ON

OFF

Outdoor fanmotor

Compressor

5 seconds 15 seconds

ON

OFFCompressor

Outdoor fan

motor

R.V.coilON

OFF

ON

OFF

<COOL>

5 seconds

<HEAT>

5 seconds

9-1. Outdoor fan motor controlThe fan motor turns ON/OFF, interlocking with the compressor.[ON] The fan motor turns ON 5 seconds before the compressor starts up.[OFF] The fan motor turns OFF 15 seconds after the compressor has stopped running.

Discharge temperature thermistor

Indoor coil temperature thermistor

Defrost thermistor

Fin temperature thermistor

Ambient temperature thermistor

Outdoor heat exchanger temperature thermistor

Compressor LEV Outdoor fan motor

Indoor fan motor

DefrostheaterR.V. coil

Sensor PurposeActuator

Protection

Cooling : Coil frost prevention

Heating : High pressure protection

Cooling : High pressure protection

Heating : Defrosting

Protection

Cooling : Low outside temperature operation

Heating : Defrosting (Heater)

Low outside temperature operation

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SERVICE FUNCTIONS10

10-1. CHANGE IN DEFROST SETTINGChanging defrost finish temperature<JS> To change the defrost finish temperature, cut/solder the JS wire of the outdoor inverter P.C. board.(Refer to 11-6-1.)


11 TROUBLESHOOTING

3. Troubleshooting procedure1) First, check if the OPERATION INDICATOR lamp on the indoor unit is flashing on and off to indicate an abnormality.

To make sure, check how many times the abnormality indication is flashing on and off before starting service work.2) Before servicing, check that the connector and terminal are connected properly.3) When the electronic control P.C. board seems to be defective, check the copper foil pattern for disconnection and the

components for bursting and discoloration.4) Refer to 11-2. and 11-3.

11-1. Cautions on troubleshooting1. Before troubleshooting, check the following

1) Check the power supply voltage.2) Check the indoor/outdoor connecting wire for miswiring.

2. Take care of the following during servicing1) Before servicing the air conditioner, be sure to turn OFF the main unit first with the remote controller, and then after

confirming the horizontal vane is closed, turn OFF the breaker and / or disconnect the power plug.2) Be sure to turn OFF the power supply before removing the front panel, the cabinet, the top panel, and the electronic

control P.C. board.3) When removing the electrical parts, be careful to the residual voltage of smoothing capacitor. 4) When removing the electronic control P.C. board, hold the edge of the board with care NOT to apply stress on the

components.5) When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires.

Housing pointLead wiring

Jumper wire Defrost finish temperature (:)

JSnone(cut)

soldered(Initial setting)

10

5


10-2. PRE-HEAT CONTROL SETTINGPRE-HEAT CONTROLWhen moisture gets into the refrigerant cycle, it may interfere the start-up of the compressor at low outside tempera-ture. The pre-heat control prevents this interference. The pre-heat control turns ON when outside temperature is 20°Cor below. When pre-heat control is turned ON, compressor is energized. (about 50 W)

<JK> To activate the pre-heat control, cut the JK wire of the inverter P.C. board. (Refer to 11-6.1)

NOTE: When the inverter P.C. board is replaced, check the Jumper wires, and cut/solder them if necessary.

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Operational procedure

Yes(Blinks)

No(OFF)

Yes

No

Releasing the failure mode recall function

NOTE: 1. Make sure to release the failure mode recall function once it's set up, otherwise the unit cannot operate properly. 2. If the abnormal condition is not deleted from the memory, the last abnormal condition is kept memorized.

W2. Blinking pattern when the indoor unit is abnormal:

W3.Blinking pattern when the outdoor unit is abnormal:

ONOFF

BeepsRepeated cycle Repeated cycle

ONOFF

No beep BeepsRepeated cycle

2.5-second OFFBlinking at 0.5-second interval

2.5-second OFF 3-second ONBlinking at 0.5-second interval

BeepsRepeated cycle

2.5-second OFFBlinking at 0.5-second interval



Repeated cycle

Beeps

Does POWER lamp on the indoor unit blink at the interval of 0.5 seconds?Blinks: Either indoor or outdoor unit is abnormal. Beep is emitted at the same timing as the blinking of POWER lamp. W2

The cause of abnormality cannot be found because the abnormality doesn't recur.

Setting up the failure mode recall function

Before blinking, does POWER lamp stay ON for 3 seconds?Stays ON for 3 seconds (without beep): The outdoor unit is abnormal.

The indoor unit is abnormal.Check the blinking pattern, and confirm the abnormal point with the indoor unitfailure mode table (Refer to indoor unit service manual.)Make sure to check at least two consecutive blinking cycles. W2

Turn ON the power supply.<Preparation of the remote controller>1 While pressing both OPERATION SELECT button and TOO COOL button on the remote controller at the same time, press RESET button.2 First, release RESET button. And release the other two buttons after all LCD in operation display section of the remote controller is displayed after 3 seconds.

Deleting the memorized abnormal condition

1After repairing the unit, recall the failure mode again according to "Setting up the failure mode recall function" mentioned above.2Press OPERATE/STOP(ON/OFF) button of the remote controller (the set temperature is displayed) with the remote controller headed towards the indoor unit.3Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted.4Release the failure mode recall function according to "Releasing the failure mode recall function" mentioned above.

Repair the defective parts.

Release the failure mode recall function by the following procedures.Turn OFF the power supply and turn it ON again.Press RESET button of the remote controller.

Judgment of indoor/outdoor abnormality

Press OPERATE/STOP(ON/OFF) button of the remote controller (the set temperature is displayed) with the remote controller headed towards the indoor unit. W1

Indoor unit is normal.But the outdoor unit might be abnormal because there are some abnormalities that can't be recalled with this way.Confirm if outdoor unit is abnormal according to the detailed outdoor unit failure mode recall function.(Refer to 11-2.2)

The outdoor unit is abnormal.Check the blinking pattern, and confirm the abnormal point with theoutdoor unit failure mode table (Refer to 11-2.3).Make sure to check at least two consecutive blinking cycles. W3

W1. Regardless of normal or abnormal condition, a short beep is emitted once the signal is received.

Outline of the functionThis air conditioner can memorize the abnormal condition which has occurred once.Even though LED indication listed on the troubleshooting check table (11-3.) disappears, the memorized failure detailscan be recalled.This mode is very useful when the unit needs to be repaired for the abnormality which doesn't recur.

11-2. Failure mode recall function

1. Flow chart of failure mode recall function for the indoor/outdoor unit

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2. Flow chart of the detailed outdoor unit failure mode recall function

Operational procedure

NOTE: 1. Make sure to release the failure mode recall function once it's set up, otherwise the unit cannot operate properly. 2. If the abnormal condition is not deleted from the memory, the last abnormal condition is kept memorized.

W2.Blinking pattern when outdoor unit is abnormal:

Yes(Blinks)

No(OFF)

ONOFF





Repeated cycle

W1. Regardless of normal or abnormal condition, 2 short beeps are emitted as the signal is received.

Does POWER lamp on the indoor unit blink at the interval of 0.5 seconds?Blinks: The outdoor unit is abnormal. Beep is emitted at the same timing as the blinking of POWER lamp. W2

Deleting the memorized abnormal condition

1After repairing the unit, recall the failure mode again according to "Setting up the failure mode recall function" mentioned above.2Press OPERATE/STOP(ON/OFF) button of the remote controller (the set temperature is displayed) with the remote controller headed towards the indoor unit.3Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted.4Release the failure mode recall function according to "Releasing the failure mode recall function" mentioned above.

Repair the defective parts.

With the remote controller headed towards the indoor unit, press TOO COOL or TOOWARM button to adjust the set temperature to 25 :. W1

The outdoor unit is normal.

Releasing the failure mode recall function

Release the failure mode recall function by the following procedures. Turn OFF the power supply and turn it ON again.Press RESET button of the remote controller.

The outdoor unit is abnormal.Check the blinking pattern, and confirm the abnormal point with theoutdoor unit failure mode table (Refer to 11-2.3.).Make sure to check at least two consecutive blinking cycles. W2

Release the failure mode recall function according to the left mentioned procedure.

Confirm that the remote controller is in the failure mode recallfunction.

The outdoor unit might be abnormal.Confirm if outdoor unit is abnormal according to the following procedures.

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3. Outdoor unit failure mode table

2-time flash2.5 seconds OFF







9-time flash2.5 seconds OFF10-time flash2.5 seconds OFF




None (Normal)Outdoor power system

Discharge temperature thermistor Defrost thermistor Fin temperature thermistor

P.C. board temperature thermistor

Ambient temperature thermistor

Overcurrent

Compressor synchronous abnormality (Compressor start-up failure protection)

Discharge temperature

High pressure

Fin temperature/ P.C. boardtemperature

Outdoor fan motor

Nonvolatile memory data

Discharge temperature

DC voltage

Each phase current of compressor

OvercurrentCompressor open-phase

Stop valve(Closed valve)

Abnormal point(Failure mode / protection)

Overcurrent protection stop is continuously performed 3 times within 1 minute after the compressor gets started.

Thermistor shorts or opens during compressor running.

Large current flows into intelligent power module.

Waveform of compressor current is distorted.

Temperature of discharge temperature thermistor exceeds 116 :, compressor stops. Compressor can restart if dischargetemperature thermistor reads 100 : or less 3 minutes later.Temperature indoor coil thermistorexceeds 70 : in HEAT mode.Temperature defrost thermistor exceeds 70 : in COOL mode.Temperature of fin temperature thermistor on the inverter P.C. board exceeds 75 : ~80 :, or temperature of P.C. board temperature thermistor on the inverter P.C. board exceeds 70 :~75 :.

Outdoor fan has stopped 3 times in a row within 30 seconds after outdoor fan start-up.

Nonvolatile memory data cannot be read properly.Temperature of discharge temperature thermistor has been 50 : or less for 20 minutes.

DC voltage of inverter cannot be detected normally.Each phase current of compressor cannot be detected normally.Large current flows into intelligent power module (IPM). The open-phase operation of compressor is detected. The interphase short out occurs in the output of the intelligent power module (IPM).The compressor winding shorts out.

Closed valve is detected by compressorcurrent.

Condition

•Reconnect connectors.•Refer to 11-5. A"How to check inverter/ compressor".•Check stop valve.•Refer to 11-5.G"Check of outdoor thermistors".❈ Defective outdoor thermistors can be identified by checking the blinking pattern of LED.

•Reconnect compressor connector.•Refer to 11-5.A"How to check inverter/ compressor".•Check stop valve.•Reconnect compressor connector.•Refer to 11-5.A"How to check inverter/ compressor".•Check refrigerant circuit and refrigerant amount.•Refer to 11-5.K"Check of LEV".

•Check refrigerant circuit and refrigerant amount.•Check stop valve.

•Check around outdoor unit.•Check outdoor unit air passage.•Refer to 11-5.I"Check of outdoor fan motor".

•Refer to 11-5.I"Check of outdoor fan motor". Refer to 11-5.L"Check of inverter P.C. board".

•Replace the inverter P.C. board.•Refer to 11-5.K"Check of LEV".•Check refrigerant circuit and refrigerant amount.•Refer to 11-5.A"How to check inverter/ compressor".

•Reconnect compressor connector.•Refer to 11-5. A"How to check inverter/ compressor".

•Check stop valve

CorrespondenceIndoor/outdoor

unit failure moderecall function

Outdoor unitfailure mode

recall function

1-time flash every2.5 seconds3-time flash2.5 seconds OFF4-time flash2.5 seconds OFF2-time flash2.5 seconds OFF11-time flash2.5 seconds OFF


7-time flash 2.5 seconds OFF


8-time flash2.5 seconds OFF9-time flash2.5 seconds OFF10-time flash2.5 seconds OFF

LED indication(Outdoor P.C. board)

OFF

POWER lamp(Indoor unit)


NOTE: Blinking patterns of this mode differ from the ones of Troubleshooting check table (11-3.).

OBH489--1.qxp 07.8.9 4:27 PM

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ON

OFF2.5-second OFF 2.5-second OFF

The flashing frequency shows the number of times the LED blinks after every 2.5-second OFF.(Example) When the flashing frequency is “2”.

Abnormal point/ ConditionOvercurrent protection stop is continuously performed 3 times within 1 minute after the compressor gets started, or failure of restart of compressor has repeated 24 times.

Discharge temperature thermistor, fin temperature thermistor, defrost thermistor, P.C. board temperature thermistor or ambient temperature thermistor shorts or opens during compressor running.Nonvolatile memory data cannot be read properly.

(POWER lamp of the indoor unit lights up or flashes 7-time.)

Large current flows into intelligent power module, or compressor repeats after 15 seconds when overcurrent protection occures within 10 seconds after compressor starts. (Repeated 24 times at Maximum)

Temperature of discharge temperature thermistor exceeds 116:, compressor stops. Compressor can restart if discharge temperature thermistor reads 100: or less 3 minutes later.

Temperature of fin temperature thermistor on the heat sink exceeds 75 :~ 80 : or temperature of P.C. board temperature thermistor on the inverter P.C.board exceeds 70 :~ 75 :.

Indoor coil thermistor exceeds 70 : in HEAT mode. Defrost thermistor exceeds 70 : in COOL mode.

Current from power outlet reaches the protection current, and compressor frequency lowers.

Temperature of indoor coil thermistor exceeds 55 : in HEAT mode, compressor frequency lowers.

Indoor coil thermistor reads 8 : or less in COOL mode, compressor frequency lowers.

Temperature of discharge temperature thermistor exceeds 111 :, compressor frequency lowers.

Temperature of discharge temperature thermistor has been 50 : or less for 20 minutes.

No.

1

2

3

7

8

9

10

15

16

17

18

19

Symptom LED indication Condition Correspondence

Outdoor unit does not operate.

'Outdoor unit stops and restarts 3 minutes later' is repeated.

Outdoor unit operates.

Outdoor unit operates.

1-time flash every 2.5 seconds









Outdoor power system

Outdoor thermistors

Outdoor control system

Overcurrent protection

Discharge temperature overheatprotection

Fin temperature /P.C. board temperature thermistor overheat protection

High pressure protection

Frequency drop by current protection

Frequency drop by high pressure protection Frequency drop by defrosting in COOL mode

Frequency drop by discharge temperature protection

Low discharge temperature protection

· Reconnect connector of compressor.· Refer to 11-5.A "How to check

inverter/ compressor".· Check stop valve.

· Refer to 11-5.G "Check of outdoor thermistors".

· Reconnect connector of compressor.· Refer to 11-5.A "How to check inverter/compressor".· Check stop valve.

Replace inverter P.C. board.

· Check refrigerant circuit and refrigerant amount.

· Refer to 11-5.K "Check of LEV".

· Check around outdoor unit.· Check outdoor unit air passage.· Refer to 11-5.I "Check of outdoor

fan motor".


· Check stop valve.

The unit is normal, but check the following.· Check if indoor filters are clogged. · Check if refrigerant is short.· Check if indoor/outdoor unit air

circulation is short cycled.

· Refer to 11-5.K "Check of LEV".· Check refrigerant circuit and

refrigerant amount.

Inverter P.C. board (Parts side)

LEDFlashing

Refer to 11-5.M "How to check miswiring and serial signal error.

The communication fails between the indoor and outdoor unit for 3 minutes.

Serial signal


Compressor synchronous abnormality

The waveform of compressor current is distorted. · Reconnect connector of compressor.· Refer to 11-5.A "How to check inverter/compressor".


PAM protection

PAM:Pulse Amplitude Modulation

The overcurrent flows into IGBT(Insulated Gate Bipolar transistor : TR821) or when the bus-bar voltage reaches 320 V or more, PAM stops and restarts.

This is not malfunction.PAM protection will be activated inthe following cases;1Instantaneous power voltage drop (Short time power failure)2When the power supply voltage is high.


Inverter check mode

The connector of compressor is disconnected, inverter check mode starts.

Check if the connector of the compressor is correctly connected.Refer to 11-5.A "How to check inverter/ compressor".

4

11

20


Outdoor fan motor


· Check stop valve.Closed valve is detected by compressor current.Stop valve/Closed valve5


Outdoor fan has stopped 3 times in a row within 30 seconds after outdoor fan start-up.

· Refer to 11-5.I "Check of outdoor fan motor.

· Refer to 11-5.L "Check of inverter P.C. board.

12

13

14


Each phasecurrent ofcompressor

Each phase current of compressor cannot be detected normally

· Refer to 11-5.A "How to check inverter/compressor".


DC voltage DC voltage of inverter cannot be detected normally. · Refer to 11-5.A "How to check inverter/compressor".


· Refer to 11-5.K "Check of LEV".· Refer to 11-5.G "Check of

outdoor thermistors".

Refer to 11-2.2. "Flow chart of the detailed outdoor unit failure mode recall function".

Outdoor unit is defective. Outdoor unit (Other abnormality)6


0.5-second ON 0.5-second ON

11-3. Troubleshooting check table

NOTE: 1. The location of LED is illustrated at the right figure. Refer to 11-6.1.2. LED is lighted during normal operation.

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11-4. Trouble criterion of main partsMUZ-FD25VA MUZ-FD35VAMUZ-FD25VAH MUZ-FD35VAH

Part name FigureCheck method and criterion

Outdoor fan motor (MF)

R.V. coil (21S4)

Expansion valve coil (LEV)

Measure the resistance between the terminals with a tester.(Part temperature –20 ~ 40 ˚C)

WHT – BLKBLK – REDRED – WHT

Normal

Measure the resistance between the terminals with a tester.(Part temperature –10 ~ 40 ˚C)

Normal

1.32 k" ~ 1.62 k"

WHT – REDRED – ORNYLW – BRNBRN – BLU

Normal

40 " ~ 50 "

Measure the resistance with a tester.(Part temperature –10 ~ 40 ˚C)

Measure the resistance with a tester.

Refer to 11-7. "Test point diagram and voltage", 1. "Inverter P.C. board", the chart of thermistor.

Refer to 11-7. "Test point diagram and voltage", 1. "Inverter P.C. board", the chart of thermistor.

Color of the lead wire

Color of the lead wire

Discharge temperaturethermistor (RT62)

Measure the resistance with a tester. Before measurement, hold the thermistor with your hands to warm it up.

Defrost thermistor(RT61)

Fin temperaturethermistor (RT64)

Ambient temperaturethermistor (RT65)

11 " ~ 16 "

Measure the resistance between the terminals with a tester. (Part temperature –20 ~ 40 ˚C)

Compressor (MC) U-VU-WV-W

Normal

0.82 " ~ 1.06 "

Measure the resistance with a tester.(Part temperature –10 ~ 40 ˚C)

2 3

W

UV

1

WHT RED BLK

2 3

W

UV

1

WHT RED BLK

Defrost heater (H)

Normal

349 " ~ 428 "

MUZ-FD25/35VAH

Outdoor heat exchangertemperature thermistor (RT68)

LEV

WHT6

RED1

ORN4

YLW5

BR

N2

BLU

3

OBH489--1.qxp 07.8.9 11:53 AM

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Check of open phaseB

How to check inverter/ compressorA

POWER lamp flashes 5-times.Outdoor unit does not operate.

Check the voltagebetween terminals.

Check thecompressor.

Disconnect the connector (CN61)between compressor and the intelligent power module (IPM).

See 11-5.C “Check of compressor” .

No

See 11-5.B “Check of open phase” .

Replace the inverter P.C. board.

Yes

Are the voltagesbalanced?

11-5. Troubleshooting flow

Check of compressor

OK

Replace the compressor.Refer to 11-5.D "Check of compressor winding".Is the compressor normal?

No

No

Yes

Yes

Refer to 11-5.E "Check of compressor operation time". Does the compressor operate continuously?

Refer to 11-5.F "Check of compressor start failure".

C

●With the connector between the compressor and the intelligent power module disconnected, activate the inverter and check if the inverter is normal by measuring the balance of voltage between the terminals.

<< Operation method>> Start cooling or heating operation by pressing EMERGENCY OPERATION switch on

the indoor unit. (Test run operation : refer to 8-3.)<<Measurement point>>

at 3 pointsBLK (U)-WHT (V)BLK (U)-RED (W) WHT(V)-RED (W)

NOTE: 1. Output voltage varies according to power supply voltage. 2. Measure the voltage by analog type tester. 3. During this check, LED of inverter P.C. board flashes 9 times. (Refer to 11-6.1.)

Output voltage 115 V

w Measure AC voltage between the lead wires at 3 points.

9-time flash

2.5-second OFF

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Check of compressor winding

Check of compressor operation time

● Disconnect the connector (CN61) between the compressor and intelligent power module, and measure the resistance between the compressor terminals.

<<Measurement point>>at 3 points BLK-WHTBLK-REDWHT-RED

<<Judgement>>Refer to 11-4.0["] ···············Abnormal [short]Infinite["] ·······Abnormal [open]NOTE: 1. Be sure to zero the ohmmeter before measurement.

w Measure the resistance between the lead wires at 3 points.

●Connect the compressor and activate the inverter. Then measure thetime until the inverter stops due to over current.

<<Operation method>> Start heating or cooling operation by pressing EMERGENCY OPERATION switch on the indoor unit.

(Test run operation : Refer to 8-3.)<<Measurement>> Measure the time from the start of compressor to the stop of compressor

due to over current.

0 second

10 seconds

10 minutes

1 second

2 seconds

Normal

Abnormal(Refrigerant circuit defect)(closed valve)

Abnormal (Poor contact,)(Outdoor P.C.board defect)(disconnected connector)

Abnormal (Compressor lock out)(Starting defect)

Abnormal(IPM failure)(Compressor winding short)

Compressor starts

<<Judgement>> For reference

D

E

Check of compressor start failureF

Yes

No

Yes

Confirm that 1~4 is normal.•Electrical circuit check1Contact of the compressor connector (including CN61)2Output voltage of inverter P.C.board and balance of them (See 11-5.B)3Direct current voltage between DB61(+) and (-) on inverter P.C.board 4Voltage between outdoor terminal block S1-S2

Check the refrigerant circuit.Check the stop valve.

w1Heat the compressor with a drier for about 20 minutes.Do not recover refrigerantgas while heating.

Compressor start failure. Activate pre-heat control.(Refer to 10-2. "PRE-HEAT CONTROL SETTING")

After the compressor is heated with a drier, does the compressor start? w1

Does the compressor run for 10 secondsor more after it starts?

No Replace the compressor

Heating part

OBH489--1.qxp 07.8.9 11:53 AM

31

Check of outdoor thermistorsG

POWER lamp flashes 6-time.The thermistors in the outdoor unit are abnormal.

Check of R.V. coilH

Disconnect connector (CN61) between the compressor and intelligent power module.Turn ON the power supply and press EMERGENCY OPERATION switch twice (HEAT mode).

Is there 230 VAC between CN7211 and 2 on the inverter P.C.board 3 minutes after the power supply is turned ON?

Yes

No Replace the inverterP.C.board.

Replace the 4-way valve.

Replace the 4-way valve.

Disconnect connector (CN61) between the compressor and the intelligent power module.Turn ON the power supply and press EMERGENCY OPERATION switch once (COOL mode).

Is there 230 VAC between CN7211 and 2 on the inverter P.C.board 3 minutes after the power supply is turned ON?

No

Yes

w First of all, measure the resistance of R.V. coil to check if the coil is defective. Refer to 11-4.w In case CN721 is not connected or R.V. coil is open, voltage is generated between the terminal pins of the connector although any signal is not being transmitted to R.V. coil. Check if CN721 is connected.

CN721

Inverter P.C.board(Soldered side)

Replace the inverterP.C.board.

Unit operates COOL mode even if it is set to HEAT mode.

Unit operates HEAT mode even if it is set to COOL mode.

Yes

Yes

No

No

Reconnect the connector of thermistor. Turn ON the power supply and press EMERGENCY OPERATION switch.

Defrost Discharge temperature Fin temperatureAmbient temperatureOutdoor heat exchanger termperature

Thermistor Board

Inverter P.C. board

RT61RT62RT64RT65RT68

Between CN641 pin1 and pin2Between CN641 pin3 and pin4Between CN642 pin1 and pin2Between CN643 pin1 and pin2Between CN644 pin1 and pin3

Is the thermistor normal? (Refer to 11-6.1.)

Does the unit operate for 10 minutes or more withoutshowing thermistor abnormality?

Replace the thermistor except RT64.When RT64 is abnormal, replace the inverter P.C. board.

OK.(Cause is poor contact.)

Replace the inverter P.C.board.

Disconnect the connector of thermistor in the outdoor P.C.board (see below table), and measure the resistance of thermistor.

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Check of outdoor fan motorI

Outdoor fan motor does not operate.

No

Yes

Is the outdoor fan motor normal?(Refer to 11-4.)


Disconnect CN932 from the inverter P.C. board,and measure the resistance of the outdoor fan motor.

Replace the outdoor fanmotor.

Check of power supplyJ

Inverter does not operate.

Disconnect the connector(CN61) between compressor and intelligent power module.Turn ON power supply and press EMERGENCY OPERATION switch.

Check the electric parts in main circuit.

If light up, ok.If flash, refer to 11-3.

Is there voltage 280 ~ 370 VDC between DB61 (+) and DB61 (–) on the inverter P.C. board?(Refer to 11-6.1.)

Dose LED on the inverter P.C. board light up or flash? (Refer to 11-6.1.)

Yes

Yes

Yes

No

No

Replace the indoor electronic control P.C. board.

No

Yes

No Replace the inverter P.C. board.

DB61

280~370 VDC

Inverter P.C. board(Solder side)

Is there voltage 230 VAC between the indoor terminal block S1 and S2?

Rectify indoor/ outdoor connecting wire.

Does POWER lamp on the indoor unit light up?

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Check of LEV (Expansion valve)K

Heating/Cooling does not work sufficiently.

Replace the LEV.

Expansion valve operates in full-opening direction.

Is LEV properly fixed to the expansion valve?

OK

Do you hear the expansion valve "click, click·······"?Do you feel the expansion valve vibrate on touching it ?

Does the resistance of LEV have the characteristics?(Refer to 11-4.)

Measure each voltage between connector pins of CN724 on the inverter P.C. board.1.Pin3(-) Pin1(+)2.Pin4(-) Pin1(+)3.Pin5(-) Pin1(+)4.Pin6(-) Pin1(+)Is there about 3~5 VAC between each?NOTE: Measure the voltage by an analog tester.

No

Yes

Yes

Yes

No

Yes

No

NoProperly fix the LEV to the expansion valve.


NOTE : After check of LEV, do the undermentioned operations.1. Turn OFF the power supply and turn ON it again.2. Press RESET button on the remote controller.

Replace the LEV.

W1. Regardless of normal or abnormal condition, a short beep is emitted once the signal is received.

Turn ON the power supply.<Preparation of the remote controller>1 While pressing both OPERATION SELECT button and TOO COOL button on the remote

controller at the same time, press RESET button.2 First, release RESET button. And release the other two buttons after all LCD

except the set temperature in operation display section of the remote controller is displayed after 3 seconds.

Press OPERATE/STOP(ON/OFF) button of the remote controller (the set temperature is displayed) with the remote controller headed towards the indoor unit. W1

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Check of inverter P.C. boardL

Yes(10-time flash)

Yes

Check the LED indication onthe inverter P.C. board.Does the LED flash 10-time?

No

No

Is the fuse (F901) blown on the inverter P.C. board?


CN932

Inverter P.C.board(Solder side)

Check the corresponding parts following LED indication.(Refer to 11-3.)

Operate the outdoor unit by starting EMERGENCY OPERATION.

Check the connection of the connector (CN932) of outdoor fan motor. If the connection is poor, make it correct.

Check the outdoor fan motor. (Refer to11-5.I.)

Outdoor fan motor does not operate , or stops immediately after starting up.

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How to check miswiring and serial signal error (when outdoor unit does not work)M

• Unit cannot operate neither by the remote controller nor by EMERGENCY OPERATION switch.Indoor unit does not operate.

• POWER lamp flashes ON and OFF every 0.5-second.Outdoor unit doesn’t operate.

Is there rated voltage in the power supply?

Is there any miswiring, poor contact, or wire disconnection of the indoor/outdoor connecting wire?

W1. Miswiring may damage indoor electronic control P.C. board during the operation. Be sure to confirm the wiring is correct before the operation starts.W3.Be sure to check this within 3 minutes after turning ON. After 3 minutes, LED blinks 6 times. Even when the inverter P.C.board is normal, LED blinks 6 times after 3 minutes.

(Lighted or not lighted)

No

Yes

No

Yes

Yes

No

Yes

No Yes

W2 Be careful to the residual voltage of smoothing capacitor.

Be sure to release the failure-moderecall function after checking.

No

No

Yes

No

Yes

Yes

Yes

No Yes

Turn OFF the power supply.

Turn ON the power supply.

Is there rated voltage betweenoutdoor terminal block S1 andS2?

Does AREA-L lamp light up? <Confirmation of the power to the indoor unit>

Press EMERGENCY OPERATION switch once.

Check the powersupply.

A

Turn OFF the power supply.Check once more if the indoor/outdoorconnecting wire is not miswiring.Short-circuit outdoor terminal block S2 andS3.W1

B

Turn ON the power supply.

Check the wiring.

Correct them.

Turn OFF the power supply.Remove the short-circuit betweenoutdoor terminal block S2 and S3.Turn ON the power supply.Is there amplitude of 10 to 20 VDCbetween outdoor terminal block S2and S3? <Confirmation of serialsignal>

Is there rated voltage between indoorterminal block S1 and S2?<Confirmation of power voltage>

Replace the indoor electronic control P.C. board.

Replace the inverterP.C. board.W2

Is there any error of theindoor/outdoor connecting wire,such as the damage of the wire,intermediate connection, poorcontact to the terminal block?

Is there any error of theindoor/outdoor connecting wire,such as the damage of the wire,intermediate connection, poorcontact to the terminal block?

No

Replace theindoor/outdoorconnecting wire.

Replace theindoor/outdoorconnecting wire.

Is serial signalerror indicated 6 minutes later?

Yes

No

· Turn OFF inverter-controlled lighting equipment.

· Turn OFF the power supply and then turn ON again.

· Press EMERGENCY OPERATION switch.

B

· Reinstall either the unit or the light each other away.

· Attach a filter on remote control receiving section of the indoor unit.

A

Is serial signal error indicated 6 minutes later?

No

Does the LED on the inverter P.C. boardrepeat "3.6-second-OFF and 0.8-second-quick blinking"?W3

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Electromagnetic noise enters into TV sets or radiosN

Replace or repair the antenna.Replace or repair the coaxial cable.

No

No

No

Yes

Yes

No

No

Yes

Yes

Yes

Is the distance between theantennas and the indoorunit within 3 m, or is thedistance between theantennas and the outdoorunit within 3 m?

Is the distance between theTV sets or radios and theindoor unit within 1 m, or isthe distance between the TVsets or radios and theoutdoor unit within 3 m?

Are the antennas damaged?Is the coaxial cable damaged?Is there any poor contact inthe antenna wiring?

Is the indoor/outdoorconnecting wire of the airconditioner and the wiring ofthe antennas close?

Even if all of the above conditions are fulfilled, the electromagnetic noise may enter, depending on the electric field strength or the installation condition (combination of specific conditions such as antennas or wiring).Check the followings before asking for service.1.Devices affected by the electromagnetic noise TV sets, radios (FM/AM broadcast, shortwave)2.Channel, frequency, broadcast station affected by the electromagnetic noise3.Channel, frequency, broadcast station unaffected by the electromagnetic noise4.Layout of ; indoor/outdoor unit of the air conditioner, indoor/outdoor wiring, erath wire, antennas, wiring from antennas, receiver5.Electric field intensity of the broadcast station affected by the electromagnetic noise6.Presence or absence of amplifier such as booster7.Operation condition of air conditioner when the electromagnetic noise enters in 1)Turn OFF the power supply once, and then turn ON the power supply. In this situation, check for the electromagnetic noise. 2)Within 3 minutes after turning ON the power supply, press OPERATE/STOP (ON/OFF) button on the remote controller for power ON, and check for the electromagnetic noise. 3)After a short time (3 minutes later after turning ON), the outdoor unit starts running. During operation, check for the electromagnetic noise. 4)Press OPERATE/STOP (ON/OFF) button on the remote controller for power OFF, when the outdoor unit stops but the indoor/outdoor communication still runs on. In this situation, check for the electromagnetic noise.

Is the unit earthed? Earth the unit.

Extend the distance betweenthe antennas and the indoorunit, and/or the antennas andthe outdoor unit.

Extend the distance betweenthe TV sets and/or radios andthe indoor unit, or the TV setsor radios and the outdoor unit.

Extend the distance betweenthe indoor/outdoor connectingwire of the air conditioner andthe wiring of the antennas.

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Check of defrost heaterO


Is there 230 VAC between CN722 1 and 3 on the inverter P.C. board? Refer to 11-6.

Yes

No

No problem of the inverter P.C. board.

NOTE: In case both thermistors are more than the above temperature, cool them with cold water etc...

In HEAT mode, for more than 5 minutes, let the ambient temperature thermistor continue to read 5 : or below, and let the defrost thermistor continue to read -1 : or below.

Check the following points before checking electric continuity.1) Does the resistance of ambient temperature thermistor have the characteristics? Refer to 11-6.1.2) Is the resistance of defrost heater normal? Refer to 11-4.3) Does the heater protector remain conducted (not open)?4) Are both ambient temperature thermistor and circuit of defrost heater securely connected to connectors?

Outdoor base gets frozen.

MUZ-FD25VAH MUZ-FD35VAH

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-20 -10 0 10 20 30 400

10

20

30

40

50

60

70

80

90

100

Temperature(:)

Defrost thermistor(RT61)Ambient temperature thermistor(RT65)Outdoor heat exchanger temperature thermistor(RT68)

Temperature(:)

Discharge temperature thermistor(RT62)

0 10 20 30 40 50 60 70 80 90 100 110 1200

100

200

300

400

500

600

700

0 10 20 30 40 50 60 70 800

20

40

60

80

100

120

140

160

180

200

Temperature(:)

Fin temperature thermistor(RT64)

Res

ista

nce

(k"

)

Res

ista

nce

(k"

)

Res

ista

nce

(k"

)

1. Inverter P.C. board


11-6. Test point diagram and voltage

Back side of unit

Fin

tem

pera

ture

ther

mis

tor

/RT

64(C

N64

2)

Am

bien

t te

mpe

ratu

re

ther

mis

tor

/RT

65(C

N64

3)

Dis

char

ge t

empe

ratu

reth

erm

isto

r /R

T62

(CN

641)

Def

rost

the

rmis

tor

/RT

61(C

N64

1)

LEVconnector(CN724)

DB61DC260 ~300 V

Front side of unit

AC230V

Smoothingcapacitor(C62)

Output to drivecompressor(LDU,LDV,LDW)

(+)(-)

Fuse(F701)250 V 3.15 A

MUZ-FD35VAMUZ-FD35VAH Smoothing

capacitor(C61)

Smoothingcapacitor(C63)

Fuse(F801)250 V 3.15 A

Fuse(F901)250 V 3.15 A

Heaterconnector(CN722)MUZ-FD•VAH

R.V.coil(CN721)230 VAC

Jumper wire for changing defrost setting (JS)

Out

put

to d

rive

outd

oor

fan

mot

or (

CN

932)

AC230 V

Out

door

hea

t ex

chan

ger

tem

pera

ture

the

rmis

tor

/RT

68(C

N64

4)

Jumper wire for pre-heat control setting(JK)

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1. Removing the cabinet(1) Remove the screw fixing the service panel. (See Photo 2.)(2) Pull down the service panel and remove it. (See Photo 2.)(3) Disconnect the power supply and indoor/outdoor connecting wire.(4) Remove the screws fixing the top panel. (See Photo 1.)(5) Remove the top panel. (See Photo 1.)(6) Remove the screws fixing the cabinet.(7) Remove the cabinet.(8) Remove the screws fixing the back panel.(9) Remove the back panel.

12 DISASSEMBLY INSTRUCTIONS

OPERATING PROCEDURE PHOTOS

(1) Slide the sleeve and check if there is a locking lever or not. (2) The terminal with this connector has the locking mechanism.

1Slide the sleeve.2Pull the terminal while pushing the locking lever.

1Hold the sleeve, and pull out the terminal slowly.

The terminal which has the locking mechanism can be detached as shown below.There are two types ( Refer to (1) and (2)) of the terminal with locking mechanism.The terminal without locking mechanism can be detached by pulling it out.Check the shape of the terminal before detaching.

<"Terminal with locking mechanism" Detaching points>

Connector

Sleeve

Locking lever

12-1. MUZ-FD25VA MUZ-FD25VAHMUZ-FD35VA MUZ-FD35VAH NOTE : Turn OFF power supply before disassembling.

Photo 1

Photo 2

Screw of theservice panel

Direction to remove

Back panel

Servicepanel

Screw of the cabinet

Screws ofthe top panel

Screws of the cabinet

Screws of the cabinet

Screws ofthe top panel

Hooks

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4. Removing the discharge temperature thermistor,defrost thermistor and outdoor heat exchanger tem-perature thermistor.(1) Remove the cabinet and panels. (Refer to 1.)(2) Pull out the discharge temperature thermistor from its

holder. (See Photo 5.)(3) Pull out the defrost thermistor from its holder. (See Photo

6.)(4) Pull out the outdoor heat exchanger temperature thermistor

from its holder. (See Photo 6.)

Photo 5

Discharge temperature thermistor


2. Removing the inverter assembly, inverter P.C. board(1) Remove the cabinet and panels. (Refer to 1.)(2) Disconnect the lead wire to the reactor and the following

connectors;<Inverter P.C. board>CN721 (R.V.coil)CN722 (Defrost heater)CN932 (Fan motor)CN641 (Defrost thermistor and discharge temperature

thermistor)CN643 (Ambient temperature thermistor) CN644 (Outdoor heat exchanger temperature thermistor)CN724 (LEV)

(3) Remove the compressor connector (CN61).(4) Remove the screws fixing the relay panel. (See Photo 3.)(5) Remove the inverter assembly. (See Photo 4.)(6) Remove the screw of the earth wire and screw of the

T.B.support. (See Photo 4.)(7) Remove the inverter P.C. board from the inverter assembly.

Photo 3

Photo 4 (inverter assembly)

Heat sink

3. Removing R.V. coil (1) Remove the cabinet and panels. (Refer to 1.)(2) Remove the R.V. coil. (See Photo 5.)

InverterP.C. board

Screws of therelay panel

Screw of theearth wire

T.Bsupport

Screw of theT.Bsupport

R.V. coil

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41


Photo 6

Defrostthermistor

5. Removing outdoor fan motor(1) Remove the cabinet and panels. (Refer to 1.)(2) Disconnect the connectors for outdoor fan motor.(3) Remove the propeller nut. (See Photo 7.)(4) Remove the propeller. (See Photo 7.)(5) Remove the screws fixing the fan motor. (See Photo 7.)(6) Remove the fan motor.

Photo 8

6. Removing the compressor and 4-way valve(1) Remove the cabinet and panels. (Refer to 1.)(2) Remove the inverter assembly. (Refer to 2.)(3) Recover gas from the refrigerant circuit.

NOTE: Recover gas from the pipes until the pressure gauge shows 0 kg/cm2 (0 MPa).

(4) Detach the welded part of the suction and the dischargepipe connected with compressor.

(5) Remove the nuts of compressor legs.(6) Remove the compressor.(7) Detach the welded part of pipes connected with 4-way

valve. (See Photo 8.)

Photo 7

Propeller

Screws of the outdoor fan motor

Welded parts of 4-way valve

Outdoor heatexchanger tempera-ture thermistor

Propeller nut

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OBH489--2.qxp 07.8.9 11:55 AM

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

CC Copyright 2007 MITSUBISHI ELECTRIC ENGINEERING CO.,LTDDistributed in Aug. 2007. No. OBH489 6Made in Japan

New publication, effective Aug. 2007Specifications subject to change without notice.

OBH489--2.qxp 07.8.9 11:55 AM

service manual no. obh489 utilized · service manual contents 1. ... indoor unit service manual...

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