Mitsubishi SEZ-KC25VA.W Service Manual

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

TECHNICAL & SERVICE MANUAL

Series SEZ

Indoor unit [Model names]

SEZ-KC25VA

Ceiling Concealed R410A

[Service Ref.]

SEZ-KC25VA.W

Note :

•This manual does not cover outdoor units. When servicing outdoor units, please refer to the service manual No.OC322 together with this manual.

Model name	CONTENTS
indication
	1. PART NAMES AND FUNCTIONS ········2
	2. SPECIFICATIONS·································4
	3. OUTLINES AND DIMENSIONS············6
	4. WIRING DIAGRAM ·······························7
	5. REFRIGERANT SYSTEM DIAGRAM·········8
	6. TROUBLESHOOTING···························9
	7. DISASSEMBLY PROCEDURE ···········13
INDOOR UNIT	8. PARTS LIST ········································18
	9. OPTIONAL PARTS ·····························21

TEMP. ON/OFF

WIRED REMOTE CONTROLLER

1 PART NAMES AND FUNCTIONS

Indoor Unit

SEZ-KC25VA.W

Air outlet

Air outlet duct flange

Air inlet

Wired remote controller

On the controls are set, the same operation mode can be repeated by simply pressing the ON/OFF button.

● Operation buttons

Set Temperature buttons
Down
Up
Timer Menu button
(Monitor/Set button)
Mode button (Return button)
		TEMP.
Set Time buttons
Back		MENU	ON/OFF
Ahead	BACK	MONITOR/SET	DAY
Timer On/Off button	PAR-21MAA	CLOCK
(Set Day button)
Opening the
door.

		Start/Stop button
		Fan Speed button
		Filter		button
		(<return sign> button)
	ON/OFF	Test Run button
		Service button (Clear button)
	FILTER
	CHECK	TEST
OPERATION		Airflow Up/Down button
	CLEAR
		Louver button
		(		Operation button)
				To preceding operation
				number.
		Ventilation button
		(	Operation button)
				To next operation number.

2

● Display

For purposes of this explanation, all parts of the display are shown as lit. During actual operation, only the relevant items will be lit.

Identifies the current operation

Shows the operating mode, etc.

*Multilanguage display is supported.

“Centrally Controlled” indicator

Indicates that operation of the remote controller has been prohibited by a master controller.

“Timer Is Off” indicator

Indicates that the timer is off.

Temperature Setting

Shows the target temperature.

Day-of-Week

Shows the current day of the week.

Time/Timer Display

Shows the current time, unless the simple or Auto Off timer is set.

If the simple or Auto Off timer is set, shows the time remaining.

TIME SUN MON TUE WED THU FRI SAT
TIMER	Hr	ON
AFTER	AFTER	OFF
ERROR CODE		FUNCTION
˚F˚C		FILTER
˚F˚C
		WEEKLY
ONLY1Hr.		SIMPLE
		AUTO OFF

Up/Down Air Direction indicator

The indicator shows the direction of the outcoming airflow.

“One Hour Only” indicator

Displayed if the airflow is set to weak and downward during COOL or DRY mode. (Operation varies according to model.)

The indicator goes off after one hour, at which time the airflow direction also changes.

Room Temperature display

Shows the room temperature.

Louver display

Indicates the action of the swing louver. Does not appear if the louver is stationary.

(Power On indicator)

Indicates that the power is on.

“Sensor” indication

Displayed when the remote controller sensor is used.

“Locked” indicator

Indicates that remote controller buttons have been locked.

“Clean The Filter” indicator

Comes on when it is time to clean the filter.

Timer indicators

The indicator comes on if the corresponding timer is set.

Fan Speed indicator

Shows the selected fan speed.

Ventilation indicator

Appears when the unit is running in Ventilation mode.

Caution

●Only the Power display lights when the unit is stopped and power supplied to the unit.

●When power is turned ON for the first time the (Centrally controlled) display appears to go off momentarily but this is not a malfunction.

●“NOT AVAILABLE” is displayed when the Air speed button are pressed.This indicates that this room unit is not equipped with the fan direction adjustment function and the louver function.

●When power is turned ON for the first time, it is normal that “PLEASE WAIT” is displayed on the room temperature indication (For max. 2minutes). Please wait until this “PLEASE WAIT” indication disappear then start the operation.

3

2 SPECIFICATIONS

Indoor model

Function

Power supply

Capacity Air flow (High/Low)

			Power outlet
	Electrical	data	Running current 1
			Power input Rated frequency
			Auxiliary heater
			Power factor 1
			Fan motor current 1
	Fan	motor	Model
			Winding
			resistance (at20:)
			Dimensions W H D
			Weight
	remarks		Air direction
			Sound level (High/Low)
			Fan speed regulator
	Special		Thermistor RT11 (at 25:)
			Thermistor RT12 (at 25:)

Thermistor RT13 (at 25:)

		SEZ-KC25VA.W
	Cooling	Heating
		Single phase
		230V , 50Hz
K /h		474/288
A		10
A		0.45
W		60
A(kW)		—
%		97
A		0.28
		CRC4417BB
Ω	WHT-BLK : 261 BLK-BLU : 475
		YLW-BRN : 294
mm		790 225 550
kg		19
		1
dB(A)		36/25
		2
kΩ		10
kΩ		10
kΩ		10

NOTE : Test conditions are based on ISO 5151

Cooling : Indoor	D.B. 27:	W.B. 19:
Outdoor D.B. 35:		W.B. 24:
Heating : Indoor	D.B. 20:	W.B. 5:

Outdoor D.B. 7: W.B. 6: Refrigerant piping length (one way): 5m

1 Measured under rated operating frequency.

Specifications and rating conditions of main electric parts

INDOOR UNIT

Item	Model	SEZ-KC25VA.W
Indoor fan capacitor	(C)	1.5+	440V
Fuse	(FUSE)	250V	6.3A
Varistor	(ZNR)	ERZV10D471
Terminal block	(TB)	TO OUTDOOR UNIT : 3P TO WIRED REMOTE CONTROLLER : 2P
Indoor fan motor thermal fuse		135:i5:

4

NOISE CRITERION CURVES

SEZ-KC25VA.W

							<50Hz>
						NOTCH		SPL(dB)
							Hi	36
							Lo	25
	70					High speed
Pa						Low speed
	60
20									NC60
0dB =
	50
(dB)
									NC50
LEVEL
	40
PRESSURE									NC40
	30
									NC30
BAND	20
OCTAVE									NC20
	10	Appro
		Approximate minimum
		audible limit on continuous noise
	0
	63	125	250	500	1000	2000	4000		8000
		OCTAVE BAND CENTER FREQUENCIES (Hz)

1m	Aux.duct	2m

1.5m

Measurement location

NOTE: The sound level is measured in an anechoic room where echoes are few, when compressor stops. The sound may be bigger than displayed level under actual installation condition by surrounding echoes. The sound level can be higher by about 2 dB than the displayed level during cooling and heating operation.

5

6

The part air intake duct is attached.( 3)

(When the air intake duct is used)

	pitch)
710	664(Liftingbolt	610	Air inlet

2X12- ø 3hole

Air outlet

50X11=550

582

790

15	50

23	150		80	14	16	(52)	(57)
Air filter	Lifting plate	Control box				42.5	56.5
	(4-14x30)	459 (Lifting bolt pitch)		55
		550( 1)
		510		30	2X3- ø 3hole
				15
		2	148	13.5	14
			1

Note 1. Use M10 screw for the lifting bolt (field supply).

2.Keep the service space for the maintenance from the bottom when the heat exchanger is cleaned.

3.The direction of air intake can be changed from the bottom to the rear by attaching the bottom plate to the air intake side.

4.Drain Pan is changeable from right and left.

5.The dimension is changed, in case the optional long-life filter is attached.

Rear Air-Intake spec. :Depth is increased by 30mm( 1) Bottom Air-Intake spec. :Height is increased by 30mm( 2)

Refrigerant piping flare connection
(gas ø 9.52 copper tube):LP			········1
Refrigerant piping flare connection
(liquid ø 6.35 copper tube):HP			········2
Drain piping connection R1 (External thread)			········3
5	301	301	5
12
189			6- ø 3hole
9

Detailed chart around the air intake duct frange( 3) (Duct and frange should be supplied in the field)

Required space for service and maintenance

300			50~150
25	450	450	500
		50~150

5050	127	204.5	Access door	Ceiling surface	20mm	20mmthanMore
			225(2)

Terminal bed	3	113	Make the access door at the appointed position properly	than
			for service maintenance.	More
(Power source)	Bottom plate

W.KC25VA-SEZ	3
	OUTLINES
	DIMENSIONS AND

7

TB4

The motor connector is

BLU

MF

S1

7 6 5 4 3 2 1

S2

connected with 230V,240V

TO OUTDOOR UNIT

S3

power at factory shipment.

If 220V power is used,

7 6 5 4 3 2 1

Insert the attachment.

7 6 5 4 3 2 1

INSERT

Color/Power source

WHT/230,240V

C

P.B.

BLU/220V

1 2 3 AC220-240V

I.B.

CNSK(RED)

1 2 3 4 5 6 7

WHT

RED

ORN

(FAN)

(POWER BOARD)

1 3

1 3 (POWER)

1 3

TRANS

FAN

CNDK

CND

BLU

FUSE

(CONTROL)

CN3C

1 2

DC13.1V

X6

X5 X4

ZNR

CN2S(WHT)

WHT

1

SWE

SW3

(POWER

ON

ON

X6

X5

X4

BOARD)

2

CN2D

OFF

OFF

LED3

1

12345

SW2

CN2L

LED2

LED1

BLK

RED

ON

(2 PHASE) (INTAKE)

WHT

BLU

OFF

CN29

CN20

(LIQUID)

(REMOCON)

12345

CN90

1 2

1 2

CN32

CN51

CN41

CN21

CN22

1 2

1 2

1

TO MA-REMOTE

2

SYMBOL

NAME

SYMBOL

NAME

CONTROLLER

TH5

TH1

TH2

DC8.7-13V

P.B.

INDOOR POWER BOARD

C

CAPACITOR (FAN MOTOR)

TB15

I.B.

INDOOR CONTROLLER BOARD

MF

FAN MOTOR

CN2L CONNECTOR (LOSSNAY)

TB4

TERMINAL BLOCK (INDOOR/OUTDOOR CONNECTING LINE)

CN32 CONNECTOR (REMOTE SWITCH)

TERMINAL BLOCK (REMOTE CONTROLLER

NOTES: 1. Since the outdoor side electric wiring may change be sure to

CN41 CONNECTOR (HA TERMINAL-A)

TB15

TRANSMISSION LINE)

check the outdoor unit electric wiring for servicing.

CN51 CENTRALLY CONTROL

INTAKE AIR TEMP. THERMISTOR

TH1

2. Indoor and outdoor connecting wires are made with polarities, make

CN90 CONNECTOR (WIRELESS)

(0˚C/15kΩ . 25˚C/5.2kΩ

DETECT)

wiring matching terminal numbers (S1,S2,S3).

FUSE FUSE (6.3A)

PIPE TEMP. THERMISTOR/LIQUID

TH2

LED1 POWER SUPPLY (I.B.)

(0˚C/15kΩ . 25˚C/5.2kΩ

DETECT)

3. Symbols used in wiring diagram above are,

LED2 POWER SUPPLY (I.B.)

TH5

COND./EVA. TEMP. THERMISTOR

: Connector,

: Terminal.

LED3

TRANSMISSION (INDOOR-OUTDOOR)

(0˚C/15kΩ . 25˚C/5.2kΩ

DETECT)

4. The wiring between MA-REMOTE CONTROLLER and TB15 is

SW2

SWITCH (CAPACITY CODE)

included in the package.

SW3

SWITCH (MODE SELECTION)

SWE SWITCH (EMERGENCY OPERATION)

X4 RELAY (FAN MOTOR LL)

X5 RELAY (FAN MOTOR Lo)

X6

RELAY (FAN MOTOR HI)

ZNR

VARISTOR

W.KC25VA-SEZ	4
	WIRING
	DIAGRAM