Mitsubishi MSH-18NV- E4, MUH-18NV- E4 Service Manual

Revision:

●Information for connecting MSH-18NV- E4 with

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

MXZ-32RV- E1 was described.

●TROUBLESHOOTING has been modified.

No. OB229

REVISED EDITION-A

SERVICE MANUAL

Wireless type

Model

MSH-18NV - E4 (WH) · MUH-18NV - E4

CONTENTS

1.TECHNICAL CHANGES ····································2

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

3.SPECIFICATION·················································4

4.OUTLINES AND DIMENSIONS ························ 5

5.WIRING DIAGRAM ············································6

6.REFRIGERANT SYSTEM DIAGRAM ················7

MSH-18NV - E4

7. PERFORMANCE CURVES ································8

8. MICROPROCESSOR CONTROL ····················10

9. SERVICE FUNCTIONS ····································19

10. TROUBLESHOOTING······································21

11. DISASSEMBLY INSTRUCTIONS·····················30

12.PARTS LIST··················································· ···34

13.OPTIONAL PARTS···········································37

•Refer to the Service Manual OB185 REVISED EDITION C when MSH-18NV- E4 is connected with MXZ-32NV- E1 or MXZ-32NV- E2 as multi system units.

•Refer to the Service Manual OB227 REVISED EDITION-B when MSH-18NV- E4 is connected with MXZ-32RV- E1 as multi system units.

1 TECHNICAL CHANGES

MSH-18NV- E4 became possible the connection to MXZ-32RV- E1 as multi system units.

2 PART NAMES AND FUNCTIONS

INDOOR UNIT

MSH-18NV - E4

Front panel

(When the grille is open)

2

OUTDOOR UNIT

MUH-18NV - E4

REMOTE CONTROLLER

MSH-18NV - E4

Signal transmitting section

Operation display section

OPERATE/STOP

(ON/OFF)button

OPERATION SELECT button

FAN SPEED CONTROL button

SLEEP button

ON-TIMER button

CLOCK SET button

HR. button MIN. button (TIMER SET button)

Air inlet (back and side)

Piping

Drainage hose

Air outlet

Drain outlet

TEMPERATURE buttons

VANE CONTROL button SWING button OFF-TIMER button RESET button

3

3

SPECIFICATION

wRefer to the Service Manual OB185 REVISED EDITION C when MSH-18NV- E4

is connected with

MXZ-32NV- E1

or MXZ-32NV- E2

as multi system units.

wRefer to the Service Manual OB227 REVISED EDITION-B when MSH-18NV- E4

is connected with

MXZ-32RV- E1

as multi system units.

Model

MSH-18NV - E4

WMSH-18NV-

(INDOOR UNIT)

E4

Function

Cooling

Heating

Cooling

Heating

Power supply

Single phase,220-240V,50Hz

Single phase,220-240V,50Hz

Capacity

kW

5.1

5.4

—

—

Capacity

Dehumidification

R/h

2.5

—

—

Air flow(Hi)

K /h

INDOOR 756 OUTDOOR 2142-2244

756

Power outlet

A

15

10

Running current

A

9.4-9.2

9.2-9.0

0.28

Power input

W

2,030-2,120

1,980-2,070

60

Auxiliary heater

A(kW)

—

—

—

Electrical data

Power factor

%

98-96

98-96

97-89

Starting current

A

52-58

—

Compressor motor current

A

8.76-8.56

8.56-8.36

—

Fan motor current

A

INDOOR 0.25 OUTDOOR 0.39

0.25

Coefficient of performance(C.O.P)

2.51-2.41

2.73-2.61

—

Model

PH-36VPET

—

Compressor

Output

W

1600

—

Winding resistance(at20:)

"

C-R1.03 C-S2.04

—

Indoor

Model

RA4V27-EA or EF

RA4V27-EA or EF

fan motor

Winding resistance(at20:)

"

WHT-BLK183.8 BLK-RED250.5

WHT-BLK183.8 BLK-RED250.5

Outdoor

Model

RA6V50-OF or OG

—

fan motor

Winding resistance(at20:)

"

WHT-BLK116.4 BLK-RED111.0

—

Width

mm

1,015

1,015

Indoor unit

Height

mm

320

320

Dimensions

Depth

mm

190

190

Width

mm

850

—

Outdoor unit

Height

mm

605

—

Depth

mm

290

—

Weight

Indoor unit

kg

14

14

Outdoor unit

kg

54

—

Air direction

5

5

Sound level

Indoor unit

dB

42

42

(Hi)

Outdoor unit

dB

52

—

Fan speed

Indoor unit

rpm

1,180

1,180

(Hi)

Outdoor unit

rpm

810-845

—

Special remarks

Fan speed

Indoor unit

4

4

regulator

Outdoor unit

1

—

Refrigerant filling capacity(R-22)

kg

1.65

—

Refrigerating oil

(Model)

cc

900 (MS32N1)

—

RT11(at25:)

k"

10

10

Thermistor

RT12(at25:)

k"

10

10

RT61(at0:)

k"

33.18

—

NOTE:Test conditions

Cooling : Indoor DB27°C / WB19°C

Heating : Indoor DB20°C /WB15.5°C

Outdoor DB35°C / WB24°C

Outdoor DB7°C / WB6°C

4

4 OUTLINES AND DIMENSIONS

MSH-18NV - E4

INDOOR UNIT

995

1015

320
	50	775
		56	17.5
		160
MUH-18NV - E4
OUTDOOR UNIT
	Drainage	355	20
		350
	hole [16.2
		Air in
	35
248	90
	Air in
	Drainage	Air out
	3holes [33

605

292
20	183
	500
	850

Unit: mm

		4holes 11 20	Indoor unit
	150	648	217
60	40			20
		450	254	297
		450

3

438 352

Installation plate

190

Air in

190	Air out

Wall hole [75

5

Installation plate

Liquid line [8-0.5m {Gas line [12-0.43m Insulation [50 O.D

[28 I.D

Drain hose [16

Insulation [28

Power supply cord

Lead to right 2m

Lead to left 1m

sides

or

right/left

only

front

top

has

.

unobstructed

vacant,

If

the

the

are

10cm

to

be

290

310

345

50

30

157

100

If the right/left sides or back side is vacant, the front has only to be 50cm unobstructed.

Service panel

Liquid refrigerant pipe joint

Refregerant pipe (flared) [6.35

-	-
30	35

Gas refregerant pipe joint

161 Refregerant pipe (flared) [15.88

74

5

5 WIRING DIAGRAM

MSH-18NV - E4 MODEL WIRING DIAGRAM

INDOOR UNIT TO OUTDOOR

LTB BRN

UNIT

CN

RT12

CONNECTING

BRN

HIC1

IC141

112

12VDC

3

RED

F12

3

BLU

NR11 C11

CN

BRN

N

2

BLU

1

4

TRANS

BLU

4

WHT MF

220-240V~2

WHT

BLU

CN201

52C

121

YLW

1

3

3

CN211

GRY

BLU

BRN

F11

2

RED

BLK

POWER

GRN/YLW

LD1

1

DSAR

SUPPLY

CN

CN

CN

CN

RT11

CORD

101

102

151 ELECTRONIC CONTROL P.C BOARD

111

~/N 220-240V

5

50Hz

3

3

GRN/YLW

MV

CIRCUIT BREAKER

RECEIVER

DISPLAY

P.C.BOARD

P.C.BOARD

FOR MULTI SYSTEM

L

12VDC 3

TO OUTDOOR

2

REMOTE

UNIT

N

CONTROLLER

CONNECTING

SYMBOL	NAME	SYMBOL	NAME	SYMBOL	NAME
C11	INDOOR FAN CAPACITOR	HIC1	DC/DC CONVERTER	RT12	INDOOR COIL THERMISTOR
DSAR	SURGE ABSORBER	MF	INDOOR FAN MOTOR(INNER FUSE)	TB	TERMINAL BLOCK
F11	FUSE(3.15A)	MV	VANE MOTOR	52C	CONTACTOR
F12	THERMAL FUSE(93:)	NR11	VARISTOR
IC141	HYBRID IC	RT11	ROOM TEMPERATURE THERMISTOR

NOTE:1. For the outdoor electric wiring refer to the outdoor unit electric wiring diagram for servicing.

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

3.Symbols below indicate.

:Terminal block, : Connector

MUH-18NV - E4

MODEL WIRING DIAGRAM

OUTDOOR UNIT

21S4

52C

RT61

BLK

BLK

VLT

VLT

TB

MF

CN730 CN661

12VDC

3

RED

CN721

CN720

1

F61

X62

FROM INDOOR UNIT CONNECTING

220-240V~2

WHT

SR61

C65

1

RED

1

RED

WHT

TAB21

IC881

NR61

2

WHT 2 ORN

N

3

3 WHT

BLU

TRANS

4

BLK 4 BLK

X62 CN711

DSAR

TAB20

DEICER P.C.BOARD

GRN/YLW

WHT NO 52C COM

WHT

C

C1

BLU

RED

MC

R

BLK

S

SYMBOL

NAME

SYMBOL

NAME

SYMBOL

NAME

C1

COMPRESSOR CAPACITOR

MC

COMPRESSOR(INNER THERMOSTAT)

TB

TERMINAL BLOCK

C65

OUTDOOR FAN CAPACITOR

MF

OUTDOOR FAN MOTOR(INNER THERMOSTAT)

X62

REVERSING VALVE COIL RELAY

DSAR

SURGE ABSORBER

NR61

VARISTOR

21S4

REVERSING VALVE COIL

F61

FUSE(2A)

RT61

DEFROST THERMISTOR

52C

CONTACTOR

IC881

DC/DC CONVERTER

SR61

SOLID STATE RELAY

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

2. Symbols below indicate.

Sleeve

: Terminal block,

: Connector

1.Slide the sleeve.

3. “ ”show the terminals with a lock mechanism, so they cannot be removed when you pull

Locking lever

2.Pull the wire while

the lead wire.

pushing the locking

Be sure to pull the wire by pushing the locking lever (projected part) of the terminal with a finger.

lever.

6

6 REFRIGERANT SYSTEM DIAGRAM

MSH-18NV - E4			MUH-18NV - E4
			OUTDOOR UNIT
INDOOR UNIT	Refrigerant pipe [15.88	Reversing valve
	(Option)	(4- way valve)

(with heat insulator)

Indoor	Indoor coil
	thermistor
heat	RT12
exchanger	Distributor

Flared connection

Muffler
Stop valve	Strainer	Outdoor
(with service port)
	Defrost	heat
		exchanger
	thermistor
	RT61

Room temperature
thermistor
RT11	Accumulator

Flared connection

Strainer

Stop valve

Refrigerant pipe[ 6.35 (Option)

(with heat insulator)

MAX. REFRIGERANT PIPING LENGTH

Compressor

Capillary tube [3.0o[2.0o500

Capillary tube [3.0o[1.6o750 (2 pcs)

Check valve

Reversing valve coil (4-way valve coil) Heating ON Cooling OFF

Refrigerant flow in cooling

Refrigerant flow in heating

		Refrigerant piping	Piping size O.D : mm		Length of connecting pipe : m
	Model	Max. length : m
		A	Gas	Liquid	Indoor unit	Outdoor unit
	MSH-18NV - E4	15	15.88	6.35	Gas 0.43	Gas 0
					Liquid 0.5	Liquid 0

MAX. HEIGHT DIFFERENCE

Indoor unit

wMax. Height	Refrigerant Piping
difference: 5m	Max. Length
	A

Outdoor unit

wHeight difference should be within 5m

regardless of which unit, indoor or outdoor position is high.

ADDITIONAL REFRIGERANT CHARGE(R-22 : g)

Model	Outdoor unit precharged		Refrigerant piping length (one way)
	(up to 7m)	7m		10m		15m
MSH-18NV - E4	1650	0		150		400

Calculation : Xg=50g/m (A-7)m

7

7 PERFORMANCE CURVES

MSH-18NV - E4

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

	Rated voltage : ±10% (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		Cooling
	(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		Heating
	(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.

OUTDOOR UNIT

INDOOR UNIT

Wet-and dry-bulb thermometers

Wet-and dry-bulb thermometers

12.2

11.2

10.1

9.1

8.2

7.2

MSH-18NV - E4

8

28.0

25.9

23.7

21.6

19.4

17.2

15.1

12.9

MSH-18NV - E4

NOTE:The above curves are for the heating operation without any frost.

OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT COOL operation

1 Both indoor and outdoor unit are under the same temperature/humidity condition.

Dry-bulb temperature	Relative humidity(%)
20	50
25	60
30	70

2 Air flow should be set at MAX.

3The unit of pressure has been changed to MPa on the international system of units(SI unit system). The conversion factor is : 1(MPa • G) =10.2(kgf/f • G)

(kgf/F•G)(MPa•G) MUH-18NV - E4

low pressure	7		0.7
			0.6
	6
							220V/240V
	5		0.5
Outdoor	4	0.4
	3		0.3
					18 20				30 32 35(:)
		15					25
					50		60		70(%)

Ambient temperature(˚C)

Ambient humidity(%)

HEAT operation

Condition indoor:Dry bulb temperature 20.0°C Wet bulb temperature 14.5°C

Outdoor:Dry bulb temperature 7,15,20°C

Wet bulb temperature 6,12,14.5°C

Outdoor unit current (A)

Outdoor unit current (A)

MUH-18NV - E4

11

10

220V/240V

9

8

7

6

15 18 20	25	30 32 35(:)
50	60	70(%)

Ambient temperature(˚C)

Ambient humidity(%)

MUH-18NV - E4

11

10

220V/240V

9

8

7		20 21 25(:)
5 7 10	15

Ambient temperature(˚C)

9

8 MICROPROCESSOR CONTROL

WIRELESS REMOTE CONTROLLER	MSH-18NV - E4
	Once the operation mode are set, the same operation mode
	can be repeated by simply turning the OPERATE/STOP
	(ON/OFF) button ON.
	Indoor unit receives the signal with a beep tone.
	When the system turns off, 3-minute time delay will operate to
	protect system from overload and compressor will not restart
	for 3 minutes.
	8-1. “I FEEL CONTROL” (	) OPERATION
	(1) Press OPERATE/STOP (ON/OFF) button on the remote
	controller. Operation Indicator lamp of the indoor unit
	turns on with a beep tone.
	(2) Press OPERATION SELECT button to set “I FEEL
	CONTROL”( ). Then a beep tone is heard.
	(3) The operation mode is determined by the room
	temperature at start-up of the operation.
	Initial room temperature	Mode
	25: or more	COOL mode of
		"I FEEL CONTROL"
	23:to 25:	DRY mode of
		"I FEEL CONTROL"
	less than 23:	HEAT mode of
		"I FEEL CONTROL"

• Once the mode is fixed, the mode does not change by

room temperature afterwards.

INDOOR UNIT DISPLAY SECTION

• Under the ON-TIMER (

) operation, mode is

Operation Indicator lamp

determined according to the room temperature as the

operation starts.

The operation indicator at the right side of the indoor

• When the system is stopped with the OPERATE/STOP

unit indicates the operation state.

(ON/OFF) button on the remote controller, and restarted

within 2 hours in “I FEEL CONTROL”

) mode, the

Operation Indicator

lighting

(

system operates in previous mode automatically

regardless of the room temperature.

not lighting

Example

Previous operation

Restart

COOL mode of

COOL mode of

Difference

“I FEEL CONTROL”

“I FEEL CONTROL”

betweeen set

or COOL mode

Indication

Operation state

temperature

and room

temperature

This shows that the

air conditioner is

When the system is restarted after 2 hours and more, the

operating to reach

Approx. 2 :

the target temperature.

operation mode is determined by the room temperature

or more

Please wait unit the

at start-up of the operation.

target temperature is

obtained.

Example

Restart

COOL or DRY or

This shows that the

Previous operation

HEAT mode of “I FEEL

CONTROL” that

room temperature is

Approx. 2 : COOL mode of

determined by room

approaching the

or less

“I FEEL CONTROL”

temperature at start-up

target temperature.

or COOL mode

of the operation.

10

1deg. 1.7deg.

Difference between room temperature and set temperature during operation.

(4) The initial set temperature is decided by the initial room temperature.

	Model	Initial room temperature	Initial set temperature
	COOL mode of	26: or more	24:	1
	"I FEEL CONTROL"
		25: to 26:	Initial room temperature
			minus 2:
	DRY mode of	23: to 25:	Initial room temperature
	"I FEEL CONTROL"		minus 2:
	HEAT mode of	less than 23:	26:
	"I FEEL CONTROL"

1 When the system is restarted with the remote controller, the system operates with the previous set temperature regardless of room temperature at restart.

The set temperature is calculated by the previous set temperature.

(5)TEMPERATURES buttons

In “I FEEL CONTROL” ( ) mode, set temperature is decided by the microprocessor based on the room temperature. In addition, set temperature can be controlled by TOO WARM or TOO COOL buttons when you feel too cool or too warm. Each time the TOO WARM or TOO COOL button is pressed,the indoor unit receives the signal and emits a beep tone.

• Fuzzy control

When the TOO COOL or TOO WARM button is pressed, the microprocessor changes the set temperature, considering the room temperature, the frequency of pressing TOO COOL or TOO WARM button and the user’s preference to heat or cool. So this is called “Fuzzy control”, and works only in “I FEEL CONTROL” mode.

In DRY mode of “I FEEL CONTROL”, the set temperature doesn’t change.

TOO
COOL …	To raise the set temperature 1~2 degrees(°C)
TOO
WARM …	To lower the set temperature 1~2 degrees(°C)

— COOL mode of “I FEEL CONTROL” —

1. Indoor fan speed control

Indoor fan operates at the set speed by FAN SPEED CONTROL button. In AUTO the fan speed is as follows.

Initial temperature difference Fan Speed

Room temperature minus set temperature : 2 degrees or more····························Hi

Room temperature minus set temperature : Between 1 and 2 degrees·················Me

2deg. 4deg.

Room temperature minus set temperature : less than 1 degree····························Lo

2.Coil frost prevention

Temperature control

When the indoor coil thermistor RT12 reads 3°C or below, the coil frost prevention mode starts immediately. However, the coil frost prevention doesn’t work for 5 minutes since the compressor has started.

The indoor fan operates at the set speed and the compressor stops for 5 minutes.

After that, if RT12 still reads below 3°C this mode prolonged until the RT12 reads over 3°C.

11

Time control

When the three conditions as follows have been satisfied for 1 hour and 45 minutes, compressor stops for 3 minutes.

a.Compressor has been continuously operating.

b.Indoor fan speed is Lo or Me.

c.Room temperature is below 26°C.

When compressor stops, the accumulated time is cancelled and when compressor restarts, time counting starts from the beginning.

Time counting also stops temporarily when the indoor fan speed becomes Hi or the room temperature exceeds 26°C.However, when two of the above conditions (b.and c.) are satisfied again.Time accumulation is resumed.

Operation chart		ON			ON
Example
				OFF
Compressor	OFF
Outdoor fan
	ON (continuously at set speed)
Indoor fan

—DRY mode of “I FEEL CONTROL”—

The system for dry operation uses the same refrigerant circuit as the cooling circuit. The compressor and the indoor fan are controlled by the room temperature.

By such controls, indoor flow amounts will be reduced in order to lower humidity without much room temperature decrease.

1.Indoor fan speed control

Indoor fan operates at the set speed by FAN SPEED CONTROL button. However, in AUTO fan operation, fan speed becomes Lo.

2.The operation of the compressor and indoor/ outdoor fan

Compressor operates by room temperature control and time control. Set temperature is controlled to fall 2°C from initial room temperature.

Indoor fan and outdoor fan operate in the same cycle as the compressor. •When the room temperature is 23°C or over:

When the thermostat is ON, the compressor repeats 8 minutes ON and 3 minutes OFF. When the thermostat is OFF, the compressor repeats 4 minutes OFF and 1 minute ON.

•When the room temperature is under 23°C.

When the thermostat is ON, the compressor repeats 2 minutes ON and 3 minutes OFF. When the thermostat is OFF, the compressor repeats 4 minutes OFF and 1 minute ON.

Operation time chart

Example

ON

ON

Thermostat

OFF

OFF

ON

ON

ON

Indoor fan

OFF

OFF

OFF

ON

ON

ON

Outdoor fan OFF

OFF

OFF

Compressor

8 min.

3 min.

4 min. 1 min.

3.Coil frost prevention

•The operation is as same as coil frost prevention during COOL mode of “I FEEL CONTROL”.

•Indoor fan operates at the set speed and the compressor stops for 5 minutes, because protection(Coil frost prevention) has the priority.

However, when coil frost prevention works while the compressor is not operating, it’s speed becomes Lo.

12