Mitsubishi OB322 Service Manual

SERVICE MANUAL

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

Wireless type Models

No. OB322

MUH-A18WV MUH-A24WV MUH-A30WV -

Indication of model name

MUH-A18WV -

E1

CONTENTS

1. TECHNICAL CHANGES ····································3

2. PART NAMES AND FUNCTIONS······················6

3. SPECIFICATION·················································7

4. NOISE CRITERIA CURVES·······························8

5. OUTLINES AND DIMENSIONS·························9

6. WIRING DIAGRAM ··········································10

7. REFRIGERANT SYSTEM DIAGRAM··············12

8. PERFORMANCE CURVES······························15

9. MICROPROCESSOR CONTROL ····················25

10. SERVICE FUNCTIONS·····································29

11. TROUBLESHOOTING ······································29

12. DISASSEMBLY INSTRUCTIONS·····················39

13. PARTS LIST······················································43

NOTE:

•This service manual describes technical data of outdoor unit. As for indoor unit MSH-A18WV- , MSH-A24WV- and MSH-A30V- , refer to the service manual OB321.

E1E1E1

1

Refrigerating

oil

Refrigerant

New refrigerant

R410A

HFC-32: HFC-125 (50%:50%)

Pseudo-azeotropic refrigerant

Not included

A1/A1

72.6

-51.4

1.557 64

Non combustible

0

1730

From liquid phase in cylinder

Possible

Incompatible oil

Non Non

Previous refrigerant

R22

R22 (100%)

Single refrigerant

Included

A1

86.5

-40.8

0.94

44.4

Non combustible

0.055 1700

Gas phase

Possible

Compatible oil

Light yellow

Non

Refrigerant Composition (Ratio) Refrigerant handling Chlorine Safety group (ASHRAE) Molecular weight Boiling point (:) Steam pressure [25:](Mpa) Saturated steam density [25:](Kg/K) Combustibility ODP w1 GWP w2 Refrigerant charge method Additional charge on leakage Kind Color Smell

w1:Ozone Destruction Parameter : based on CFC-11 w2 :Global Warmth Parameter : based on CO

2

TECHNICAL CHANGES

MUH-18RV - ➔MUH-A18WV -

1. Refrigerant has changed. (R22➔R410A)

2. Refrigerant system diagram has changed.

• Compressor, stop valve and 4-way valve have changed.

• Diameter of stop valve has changed. (Gas: [15.88➔[12.7)

• Accumulator has removed and high pressure receiver has been added.

3. Oil separator has been added.

MUH-24RV - ➔MUH-A24WV -

1. Dimension of outdoor unit has changed.

2. Refrigerant has changed. (R22➔R410A)

3. Refrigerant system diagram has changed.

• Diameter of stop valve has changed. (Liquid: [9.52➔[6.35)

• Accumulator has removed and high pressure receiver has been added.

MUH-30RV - ➔MUH-A30WV -

1. Dimension of outdoor unit has changed.

2. Refrigerant has changed. (R22➔R410A)

3. Refrigerant system diagram has changed.

• Accumulator has removed and high pressure receiver has been added.

E1E2

E1E1

INFORMATION FOR THE AIR CONDITIONER WITH R410A REFRIGERANT

• This room air conditioner adopts an HFC refrigerant (R410A) which never destroys the ozone layer.

• Pay particular attention to the following points, though the basic installation procedure is same as that for R22 conditioners. 1 As R410A has working pressure approximate 1.6 times as high as that of R22, some special tools and piping parts/

materials are required. Refer to the table below.

2 Take sufficient care not to allow water and other contaminations to enter the R410Arefrigerant during storage and

installation, since it is more susceptible to contaminations than R22.

3 For refrigerant piping, use clean, pressure-proof parts/materials specifically designed for R410A. (Refer to 2. Refrigerant

piping.)

4 Composition change may occur in R410A since it is a mixed refrigerant. When charging, charge liquid refrigerant to prevent

composition change.

3

NOTE : The unit of pressure has been changed to MPa on the international system of units(SI unit system).

New Specification Current Specification

The incompatible refrigerating oil easily separates from refrigerant and is in the upper layer inside the suction muffler. Raising position of the oil back hole enables to back the refrigerating oil of the upper layer to flow back to the compressor.

Since refrigerant and refrigerating oil are compatible each, refrigerating oil backs to the compressor through the lower position oil back hole.

Compressor

Suction muffler

Oil back hole

Refrigerating oil

Refrigerant

Compressor

Suction muffler

Oil back hole

Refrigerating oil /Refrigerant

Compressor

-30 -20 -10 0 10 20

30

40 50 60

-0.5

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

(MPa [Gauge])

R410A R22

Conversion chart of refrigerant temperature and pressure

Saturated liquid pressure

(:)

R410A tools Can R22 tools be used?

Gas leak detector

R410A has high pressures beyond the measurement range of existing gauges. Port diameters have been changed to prevent any other refrigerant from being charged into the unit.

Hose material and cap size have been changed to improve the pressure resistance.

Dedicated for HFC refrigerant.

6.35 mm and 9.52 mm

Description

Clamp bar hole has been enlarged to reinforce the spring strength in the tool. Provided for flaring work (to be used with R22 flare tool).

Provided to prevent the back flow of oil. This adapter enables you to use vacuum pumps.

It is difficult to measure R410A with a charging cylinder because the refrigerant bubbles due to high pressure and high-speed vaporization

No

Yes

New

Gauge manifold

Charge hose

Torque wrench

Flare tool Flare gauge

Vacuum pump adapter

Electronic scale for refrigerant charging

No : Not Substitutable for R410A Yes : Substitutable for R410A

No 12.7 mm and 15.88 mm

The conversion factor is: 1(MPa [Gauge]) =10.2(kgf/ff[Gauge])

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])

1.Tools dedicated for the air conditioner with R410A refrigerant

The following tools are required for R410A refrigerant. Some R22 tools can be substituted for R410A tools. The diameter of the service port on the stop valve in outdoor unit has been changed to prevent any other refrigerant being charged into the unit. Cap size has been changed from 7/16 UNF with 20 threads to 1/2 UNF with 20 threads.

4

2.Refrigerant piping

Wall thickness

Outside diameter

Pipe

mm

For liquid

For gas

6.35

9.52

12.7

15.88

0.8 mm

1.0 mm

Heat resisting foam plastic Specific gravity 0.045 Thickness 8 mm

Insulation material

1 Specifications

Use the refrigerant pipes that meet the following specifications.

• Use a copper pipe or a copper-alloy seamless pipe with a thickness of 0.8 mm (6.35, 9.52, 12.7), 1.0 mm (15.88). Never use any pipe with a thickness less than 0.8 mm (6.35, 9.52, 12.7), 1.0 mm (15.88), as the pressure resistance is insufficient.

2 Flaring work and flare nut

Flaring work for R410A pipe differs from that for R22 pipe. For details of flaring work, refer to Installation manual “FLARING WORK”.

Pipe diameter

mm

6.35

9.52

12.7

15.88

Dimension of flare nut

R410A

17 22 26 29

R22

17 22 24 27

3.Refrigerant oil

Apply the special refrigeration oil (accessories: packed with indoor unit) to the flare and the union seat surfaces.

4.Air purge

• Do not discharge the refrigerant into the atmosphere.

Take care not to discharge refrigerant into the atmosphere during installation, reinstallation, or repairs to the refrigerant

circuit.

• Use the vacuum pump for air purging for the purpose of environmental protection.

5.Additional charge

For additional charging, charge the refrigerant from liquid phase of the gas cylinder. If the refrigerant is charged from the gas phase, composition change may occur in the refrigerant inside the cylinder and the outdoor unit. In this case, ability of the refrigerating cycle decreases or normal operation can be impossible. However, charging the liquid refrigerant all at once may cause the compressor to be locked. Thus, charge the refrigerant slowly.

Union

Stop valve

Indoor unit

Refrigerant gas cylinder operating valve

Liquid pipe Gas pipe

Service port

Outdoor unit

Gauge manifold valve (for R410A)

Charge hose (for R410A)

Refrigerant gas cylinder for R410A with siphon

Refrigerant (liquid)

Electronic scale for refrigerant charging

5

2

Drainage hose

Piping

Air inlet

Air outlet

Drain outlet

(back and side)

Air outlet

(back and side)

1

2

Drain socket Drain cap {33 Drain cap {16

1 2

—

1 2 1

MUH-A18WV-

E1

MUH-A24WVMUH-A30WV-

E1 E1

PART NAMES AND FUNCTIONS

OUTDOOR UNIT

MUH-A18WV -

ACCESSORIES

Outdoor unit

E1

MUH-A24WV MUH-A30WV -

E1 E1

6

3

Outdoor model

Function

Power supply

Capacity Dehumidification Air flow(High/Low ) Starting current Compressor motor current Fan motor current

Model Output Winding resistance(at20:) Model Winding resistance(at20:) Dimensions WOHOD Weight Sound level(High) Fan speed(High/Low ) Fan speed regulator Refrigerant filling capacity(R410A) Refrigerating oil (Model) Thermistor RT61(at0:) Thermistor RT62(at25:) Thermistor RT63(at0:)

kW

R/h

K /h

A A A

W

"

mm

kg

dB

rpm

kg cc

k" k" k"

MUH-A30WV -

E1

Single phase

230V, 50Hz

90

0.57

NN37VAAHT

2,500 C-R 0.64 C-S 1.63

RA6V75-AB

WHT-BLK 62.8 BLK-YLW 55.9

YLW-RED 26.0

840o850o330

77 55

805/435

2

2.30

1,300 (NEO 22)

33.18

231.44

33.18

Cooling

8.5

4.6

2,940/1,470

13.85

2.52-2.40

Heating

9.4 —

2,940/1,470

14.62

2.73-2.70

Electrical

data

Compressor

Fan

motor

Special

remarks

Coefficient of performance(C.O.P)

Capacity

www

w

Outdoor model

Function

Power supply

Capacity Dehumidification Air flow(High) Starting current Compressor motor current Fan motor current

Model Output Winding resistance(at20:) Model Winding resistance(at20:) Dimensions WOHOD Weight Sound level(High) Fan speed(High) Fan speed regulator Refrigerant filling capacity(R410A) Refrigerating oil (Model) Thermistor RT61(at0:)

kW

r/h

K /h

A A A

W

"

mm

kg

dB

rpm

kg cc

k"

MUH-A18WV -

E1

Single phase

230V, 50Hz

2,196

37

0.39

RN196VHSHT

1,300 C-R 1.80 C-S 3.00

RA6V50-OG

WHT-BLK 116

BLK-RED 111 850o605o290

47 52

828

1

1.75

520 (NEO22)

33.18

Cooling

5.0

2.5

7.54

2.81

Heating

5.2 —

6.84

3.23

MUH-A24WV -

E1

Single phase

230V, 50Hz

2,760

74

0.58

NN29VBAHT

1,900 C-R 0.80 C-S 1.64

RA6V85-AB

WHT-BLK 63 BLK-YLW 30

YLW-RED 63

840o850o330

74 53

730

1

2.15

1,200 (NEO22)

33.18

Cooling

6.3

3.2

9.81

2.61

Heating

7.2 —

10.12

2.90

Electrical

data

Compressor

Fan

motor

Special

remarks

Coefficient of performance(C.O.P)

Capacity

SPECIFICATION

NOTE: Test conditions are based on JIS C 9612.

w Reference value

Cooling : Indoor DB27°C WB19°C Heating : Indoor DB20°C WB 15.5°C

Outdoor DB35°C WB(24°C) Outdoor DB 7°C WB 6°C

Indoor-Outdoor piping length 5m

7

4

90

80

70

60

50

40

30

20

10

63 125 250 500 1000 2000 4000 8000

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

BAND CENTER FREQUENCIES, Hz

Test conditions, Cooling : Dry-bulb temperature 35: Wet-bulb temperature 24:

APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE

52

SPL(dB(A)) LINE

High

FAN SPEED

Heating : Dry-bulb temperature 7: Wet-bulb temperature 6:

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

90

80

70

60

50

40

30

20

10

63 125 250 500 1000 2000 4000 8000

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

BAND CENTER FREQUENCIES, Hz

Test conditions, Cooling : Dry-bulb temperature 35: Wet-bulb temperature 24:

APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE

53

SPL(dB(A)) LINE

High

FAN SPEED

Heating : Dry-bulb temperature 7: Wet-bulb temperature 6:

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

NOISE CRITERIA CURVES

MUH-A18WV-

E1

MUH-A24WV-

E1

MUH-A30WV-

Test conditions, Cooling : Dry-bulb temperature 35: Wet-bulb temperature 24:

Heating : Dry-bulb temperature 7: Wet-bulb temperature 6:

90

80

E1

FAN SPEED

SPL(dB(A)) LINE

High

55

70

60

50

40

30

APPROXIMATE

20

THRESHOLD OF

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

HEARING FOR CONTINUOUS NOISE

10

63 125 250 500 1000 2000 4000 8000

BAND CENTER FREQUENCIES, Hz

OUTDOORUNIT

1m

MICROPHONE

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

8

5

OUTLINES AND DIMENSIONS

MUH-A18WV-

E1

OUTDOOR UNIT

Drainage hole [16.2

35

90

248

Air in

Drainage 3holes [33

605

292

20

355

350

Air in

Air out

183

500 850

20

50

74

157

290

30

100

310

345

100mm or more

161

500mm or more

Service panel

Liquid refrigerant pipe joint

Refregerant pipe (flared) [6.35

35-

30-

Gas refregerant pipe joint

Refregerant pipe (flared) [12.7

100mm or more

Unit: mm

350mm or more

MUH-A24WV- MUH-A30WV-

OUTDOOR UNIT

515

299

66

51

34

330

500 840

121

850

430

40

E1E1

Open as a rule 500mm or more if the front and both sides are open

100mm or more 200mm or more if

100mm or more

there are obstacles to both sides

360

Open as a rule 500mm or more if the back, both sides and top are open

80

350mm or more

Service panel

Liquid refrigerant pipe joint Refrigerant pipe (flared) [6.35 (MUH-A24WV)

[9.52 (MUH-A30WV)

30-

35-

155

90

Gas refrigerant pipe joint

198

Refrigerant pipe (flared) [15.88

9

6

WIRING DIAGRAM

MUH-A18WV -

OUTDOOR UNIT

TO INDOOR UNIT CONNECTING 12V

POWER SUPPLY

~ /N

50Hz

230V

SYMBOL

C1

C65

DSAR

F61

MC

NOTES:

COMPRESSOR CAPACITOR OUTDOOR FAN CAPACITOR SURGE ABSORBER FUSE (2A) COMPRESOR (INNER PROTECTOR)

1.About the indoor side electric wiring refer to the indoor unit electric wiring diagram for servicing.

2.Use copper conductors only. (For field wiring)

3.Symbols below indicate. : Terminal block

E1

MODEL WIRING DIAGRAM

TB2

3

RED

N

BLK

TB1

CIRCUIT BREAKER

BRN

L

BRN

N

BLU

PE

GRN/YLW

NAME

: Connector

SYMBOL

MF NR61 RT61

SR61,SR62

T61

RT61

21S4

1 2 3

CN661

CN730

CN721

SR62

SR61

CN711

1 2 3

DSAR

BLU

OUTDOOR FAN MOTOR (INNER PROTECTOR) VARISTOR DEFROST THERMISTOR SOLID STATE RELAY TRANSFORMER

F61

TAB20

NAME

T61

52C

4

NR61

3

DEICER P.C.BOARD

C1

WHT

RED

BLK

SYMBOL TB1,TB2

21S4

52C

C65

C

MC

S

TERMINAL BLOCK R.V. COIL COMPRESSOR CONTACTOR

WHT

BLK RED

R

MF

WHT

BLK

RED

ORN

1

4

23

NAME

VG79B553H01

MUH-A24WV -

OUTDOOR UNIT

CIRCUIT BREAKER

~ /N 230V 50Hz

POWER SUPPLY

12V

TO INDOOR UNIT CONNECTING

TB1

L N

PE

TB2

3

N

NOTES:

E1

MODEL WIRING DIAGRAM

RT61

BRN

DSAR

CN661

X52X62

GRN/YLW

BLU

1.Use copper conductors only (For field wiring).

2.Since the indoor and outdoor unit connecting wires have polarity, connect them according to the numbers (3,N).

3.Symbols below indicate. : Terminal block, : Connector

BLU

BRN

DEICER P.C. BOARD

BRN

3

52C

4

SR61

T61

A1 A2

WHT

52C

YLW

123

NR61

MF

BLK

C1

WHT

3456

WHT

CN711

X62

X52

ORN

RED

21

COM

CN730

F61

RED

BLK

RED

ORN

C2

CN721

NO

TAB52

NO

MC

S

SYMBOL

C1 C2

DSAR

1 2

21S4

3

F61

MC MF

7 5 3 1

NR61 RT61 SR61

TB1 TB2

C

R

T61 X52 X62

BLU

RED

BLU

21S4

52C

COMPRESSOR CAPACITOR OUTDOOR FAN CAPACITOR SURGE ABSORBER FUSE (3.15A) COMPRESSOR (INNER PROTECTOR) OUTDOOR FAN MOTOR (INNER PROTECTOR) VARISTOR DEFROST THERMISTOR SOLID STATE RELAY TERMINAL BLOCK TERMINAL BLOCK TRANSFORMER CONTACTOR R. V. COIL RELAY R. V. COIL COMPRESSOR CONTACTOR

NAME

SG79J883H01

10

MUH-A30WV -

OUTDOOR UNIT

E1

MODEL WIRING DIAGRAM

BRN

CIRCUIT BREAKER

TB1

L

DSAR

N

PE

~ /N 230V 50Hz

POWER SUPPLY

GRN/YLW

BLU

TB2

3

BRN

N

BLU

12V

TO INDOOR UNIT CONNECTING

BLU

RT61

CN661

DEICER PC BOARD

BRN

1

52C

CZ

RT62RT63

CN662

X52X62

2

WHTWHT

LEV

6

CN724

SR62 SR61

T61

NR61

WHT

A1 A2

52C

MF

YLW

BLK

WHT

ORN

RED

21

3456

RED

ORN

CN721

NO

TAB52

NO

CN730

F61

C2

1 2 3

7 5 3 1

21S4

YLW

BLK

WHT

3

1

2

CN711

X62

COM

X52

COM

C

C1

RED

BLK

MC

S

R

BLU

RED

BLU

SYMBOL

CZ C1 C2

DSAR

F61

LEV

MC

NOTE 1. Use copper conductors only (For field wiring).

CZ SURGE ABSRBER COMPRESSOR CAPACITOR OUTDOOR FAN CAPACITOR SURGE ABSORBER FUSE(3.15A) EXPANSION VALVE COIL COMPRESSOR (INNER PROTECTOR)

2. Since the indoor and outdoor unit connecting wires have polarity, connect them according to the numbers (3,N).

3. Symbols below indicate.

/: Terminal block, : Connector

NAME

SYMBOL

MF

NR61

RT61 RT62

RT63 SR61 SR62

OUTDOOR FAN MOTOR (INNER PROTECTOR) VARISTOR DEFROST THERMISTOR DISCHARGE TEMPERATURE THERMIST OR AMBIENT TEMPERA TURE THERMIST OR SOLID STATE RELAY SOLID STATE RELAY

NAME NAME

SYMBOL

TB1 TB2 T61 X52 X62

21S4

52C

TERMINAL BLOCK TERMINAL BLOCK TRANSFORMER CONTACTOR R.V. COIL RELAY R.V. COIL COMPRESSOR CONTACTOR

SG79J882H01

11

7

REFRIGERANT SYSTEM DIAGRAM

MUH-A18WV -

OUTDOOR UNIT

E1

Refrigerant pipe [12.7 (with heat insulator)

Flared connection

Refrigerant pipe[6.35 (with heat insulator)

Stop valve (with service port)

Capillary tube

[2.5o[0.6o1,000

Receiver

Stop valve

Strainer

4- way valve

Capillary tube

[3.0o[1.6o450

#100

Compressor

Check valve

Oil separator #100

Defrost thermistor RT61

Capillary tube

[3.0o[1.6o300 Refrigerant flow in cooling Refrigerant flow in heating

Outdoor heat exchanger

Capillary tube

[3.0o[1.6o750

(2 pcs)

R.V. coil Heating ON Cooling OFF

Unit:mm

MUH-A24WV -

OUTDOOR UNIT

E1

Refrigerant pipe [15.88 (with heat insulator)

Flared connection

Stop valve

Refrigerant pipe [6.35 (with heat insulator)

Stop valve (with service port)

Muffler

Receiver

Strainer

#100

4- way valve

Capillary tube

[3.0X[2.0X550

Check valve

Muffler

#100

Compressor

Capillary tube [3.0X[2.0X650

Refrigerant flow in cooling Refrigerant flow in heating

Outdoor heat exchanger

Defrost thermistor RT61

R.V. coil Heating ON Cooling OFF

12

MUH-A30WV -

Outdoor heat exchanger

Flared connection

Defrost thermistor RT61

Discharge temperature thermistor RT62

Flared connection

Stop valve

Stop valve (with service port)

Capillary tube [3.6✕[2.4✕50

Refrigerant flow in cooling

Compressor

4-way valve

Refrigerant flow in heating

Refrigerant pipe [15.88 (with heat insulator)

Refrigerant pipe [9.52 (with heat insulator)

LEV

R.V. coil heating ON cooling OFF

Muffler

#100

Strainer

#100

Receiver

Muffler

Ambient temperature thermistor RT63

Strainer

#100

Indoor unit

wMax. Height

difference: 10m(MSH-A18/A24WV)/ 15m(MSH-A30WV)

A

Refrigerant Piping Max. Length

w Height difference should be within 10m(MSH-A18/A24WV)/ 15m(MSH-A30WV) regardless of which unit, indoor or outdoor position is high.

Outdoor unit

Model

Piping size O.D : mm Length of connecting pipe : m

Refrigerant piping

Max. length : m

A

25

30

Indoor unit

Gas 0.43

Liquid 0.5

Gas

12.7

15.88

Liquid

6.35

9.52

MUH-A18WV - E1

MUH-A24WV - E1 MUH-A30WV - E1

Outdoor unit

Gas 0

Liquid 0

OUTDOOR UNIT

E1

Unit:mm

MAX. REFRIGERANT PIPING LENGTH

MAX. HEIGHT DIFFERENCE

13

Model

MUH-A18WV -

E1

Refrigerant piping length (one way)

Outdoor unit precharged

1,750

15m

160

20m

260

25m

360

7m

0

10m

60

ADDITIONAL REFRIGERANT CHARGE(R410A : g)

Model

MUH-A24WV -

E1

Refrigerant piping length (one way)

Outdoor unit precharged

2,150

15m

160

20m

260

25m

360

7m

0

10m

60

Outdoor unit

precharged

0 165 440 715 990 1,2652,300

Refrigerant piping length (one way)

15m10m7m

Model

MUH-A30WV -

E1

20m

25m 30m

Calculation : Xg=20g/m ✕ (Refrigerant piping length (m)–7)

Calculation : Xg=55g/mo(Refrigerant piping length(m)-7)

14

8

11.6

10.5

7.5

8.5

9.5

12.8

15.6

9.8

12.6

11.2

14.1

17.2

17.4

13.9

12.4

10.8

15.6

19.2

MUH-A18WV - E1

MSH-A24WV - E1

MSH-A18WV - E1

MUH-A24WV - E1

MSH-A30WV - E1

MUH-A30WV - E1

Wet-and dry-bulb thermometers

PERFORMANCE CURVES

}

E1E1E1

Cooling

Heating

MUH-A18WV - MUH-A24WV - MUH-A30WV -

The standard data contained in these specifications apply only to the operation of the air conditioner under normal conditions, since operating conditions vary according to the areas where these units are installed. The following information has been provided to clarify the operating characteristics of the air conditioner under the conditions indicated by the performance curve.

(1) GUARANTEED VOLTAGE

198 ~ 264V, 50Hz

(2) AIR FLOW

Air flow should be set at MAX.

(3) MAIN READINGS

(1) Indoor intake air wet-bulb temperature : °CWB (2) Indoor outlet air wet-bulb temperature : °CWB (3) Outdoor intake air dry-bulb temperature : °CDB (4) Total input: W (5) Indoor intake air dry-bulb temperature : °CDB (6) Outdoor intake air wet-bulb temperature : °CWB (7) Total input : W

Indoor air wet/dry-bulb temperature difference on the left side of the chart on this page and next page shows the difference between the indoor intake air wet/dry-bulb temperature and the indoor outlet air wet/dry-bulb temperature for your reference at service.

How to measure the indoor air wet-bulb/dry-bulb temperature difference

1. 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 air speed 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.

INDOOR UNIT

OUTDOOR UNIT

15