Mitsubishi Electronics MSZ-FD35VAS, MSZ-FD35VA, MSZ-FD25VA User Manual

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

INDOOR UNIT

SERVICE MANUAL

Wireless type Models

No. OBH488

MSZ-FD25VA -

MSZ-FD25VAS MSZ-FD35VA -

MSZ-FD35VAS -

Outdoor unit service manual MUZ-FD·VA Series(OBH489) MXZ-A·VA Series (OB377) MXZ-8A140A (OC316)

CONTENTS

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

2. PART NAMES AND FUNCTIONS······················4

3. SPECIFICATION·················································5

4. NOISE CRITERIA CURVES·······························6

5. OUTLINES AND DIMENSIONS·························7

6. WIRING DIAGRAM ············································7

7. REFRIGERANT SYSTEM DIAGRAM················8

8. SERVICE FUNCTIONS ······································9

9. MICROPROCESSOR CONTROL ····················11

10. TROUBLESHOOTING ······································20

11. DISASSEMBLY INSTRUCTIONS·····················36

PARTS CATALOG (OBB488)

NOTE:

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

TECHNICAL CHANGES

MSZ-FD25VA - MSZ-FD25VAS MSZ-FD35VA - MSZ-FD35VAS -

1. New model

E1E1 E1E1

Air outlet

Vertical vane

Air filter

Front panel

Horizontal vane

Remote controller

AREA lamp indicate AREA setting

In AREA setting, the horizontal air flow direction changes automatically according to the detection of i-see Sensor which detects the floor/ wall temperature to air-condition the room evenly.

i-see control operation

i-see sensor constantly measure floor/wall temperature to automatically adjust to the set temperature by estimating the temperature actually perceived by a person inside the room ("sensible temperature").

Operation Indicator lamp

Remote control receiving section

Emergency operation switch

Fan

Fan guard

i-see sensor

Heat exchanger

Air inlet

Plasma anti-allergy enzyme filter

Plasma electrode unit

Plasma deodorizing filter

AREA lamp

POWER lamp

CLEAN lamp PLASMA lamp

1 2 3 4 5 6 7

Installation plate Installation plate fixing screw 4 o 25 mm Remote controller holder Fixing screw for 3 3.5 o 1.6 mm (Black) Battery (AAA) for remote controller Wireless remote controller Felt tape (Used for left or left-rear piping)

1 5 1 2 2 1 1

PART NAMES AND FUNCTIONS

MSZ-FD25VA MSZ-FD25VAS MSZ-FD35VA MSZ-FD35VAS

ACCESSORIES

MSZ-FD25VA MSZ-FD35VA

Single phase

230 V, 50 Hz

RCOJ40-GF

798O295O257

672

516/378/276

1,190

950/740/580

KM08A

Indoor model

Power supply

Power input ✽1

Running current ✽1

Fan motor current ✽1

Fan motor model Dimensions WOHOD Weight Color Air direction Air flow (Super High) Air flow (High/Med./Low) Sound level (Super High) Sound level (High/Med./Low) Fan speed (Super High) Fan speed (High/Med./Low) Fan speed regulator Remote controller model

K /h

dB(A)

rpm

Electrical

data

Special remarks

Cooling Heating Cooling Heating Cooling Heating

Cooling Heating Cooling Heating Cooling Heating Cooling Heating Cooling Heating Cooling Heating

MSZ-FD25VAS MSZ-FD35VAS

26 31

0.25

0.30

0.25

0.30

726

552/402/270

36/29/20

1,270

1,010/780/570

28 33

0.27

0.32

0.27

0.32

750

552/402/282

36/29/21

1,300

1,010/780/590

PURE WHITE SILVER PURE WHITE SILVER

250 V 3.15 A

MP20Z 12 VDC 300 " (at 25 ˚C) MSFBC20C29 12 VDC 350 " (at 25 ˚C) MSBPC20M11 12 VDC 300 " (at 25 ˚C)

S10K320E3K1

A2TPMI 23A FOV50 OBA060 P8L1 J4S

Fuse i-see Sensor motor Horizontal vane motor Vertical vane motor Varistor i-see Sensor Terminal block

(F11)

(MT) (MV1) (MV2)

(NR11)

(RR)

(TB)

SPECIFICATION

NOTE : Test conditions are based on ISO 5151

Cooling : Indoor Dry-bulb temperature 27 : Wet-bulb temperature 19 : Heating : Indoor Dry-bulb temperature 20 :

Specifications and rating conditions of main electric parts

Refrigerant piping length (one way): 5 m ✽1 Measured under rated operating frequency.

Outdoor Dry-bulb temperature 35 : Outdoor Dry-bulb temperature 7 : Wet-bulb temperature 6 :

INDOOR UNIT

WALL

MICROPHONE

0.8 m

1 m

63 125 250 500 1000 2000 4000 8000

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

BAND CENTER FREQUENCIES, Hz

COOLING

FUNCTION

SPL(dB(A))

LINE

Super High

FAN SPEED

HEATING

Test conditions Cooling : Dry-bulb temperature 27 : Wet-bulb temperature 19 :

Heating : Dry-bulb temperature 20 :

43 43

NC-10

63 125 250 500 1000 2000 4000 8000

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

BAND CENTER FREQUENCIES, Hz

COOLING

FUNCTION

SPL(dB(A))

LINE

Super High

FAN SPEED

HEATING

NC-10

NOISE CRITERIA CURVES

MSZ-FD25VA MSZ-FD25VAS

MSZ-FD35VA MSZ-FD35VAS

225 225

155155

345

330 69

211.5

253

231.5

212.5

254

295

21.5

55 55688

100

785

798

6.5

Wall hole [65

11 X 26 Oblong hole

11 X 20 Oblong hole

Indoor unit

Installation plate

5257

Installation plate

Piping

Drain hose

Air in

Air out

159

Piping

Insulation

[35 O.D

Liquid line

[6.35 - 0.5 m (Flared connection [6.35)

Gas line

[9.52 - 0.43 m (Flared connection [9.52)

Drain hose

Insulation [28 O.D Connected part [16 O.D

OUTLINES AND DIMENSIONS

MSZ-FD25VA MSZ-FD25VAS MSZ-FD35VA MSZ-FD35VAS

Unit : mm

WIRING DIAGRAM

MSZ-FD25VA MSZ-FD25VAS MSZ-FD35VA MSZ-FD35VAS

Indoor heat exchanger

Flared connection

Room temperature thermistor RT11

Flared connection

Refrigerant pipe [9.52 (with heat insulator)

Refrigerant pipe [6.35 (with heat insulator)

Indoor coil thermistor RT12 (main)

Indoor coil thermistor RT13 (sub)

Refrigerant flow in cooling Refrigerant flow in heating

REFRIGERANT SYSTEM DIAGRAM

MSZ-FD25VA MSZ-FD25VAS MSZ-FD35VA MSZ-FD35VAS

Unit : mm

No. 1 unit No. 2 unit No. 3 unit No. 4 unit

1 unit operation No modification

– – –

2 units operation

Same as at left

Solder J1

– –

3 units operation

Same as at left Same as at left

Solder J2

–

4 units operation

Same as at left Same as at left Same as at left

Solder both J1 and J2

SERVICE FUNCTIONS

MSZ-FD25VA MSZ-FD25VAS MSZ-FD35VA MSZ-FD35VAS

8-1. TIMER SHORT MODE

For service, set time can be shortened by short circuit of JPG and JPS on the electronic control P.C. board. The time will be shortened as follows. (Refer to 10-7.) Set time : 1-minute ➔ 1-second Set time : 3-minute ➔ 3-second (It takes 3 minutes for the compressor to start operation. However, the starting time is shortened by short circuit of JPG and JPS.)

8-2. P.C. BOARD MODIFICATION FOR INDIVIDUAL OPERATION

A maximum of 4 indoor units with wireless remote controllers can be used in a room. In this case, to operate each indoor unit individually by each remote controller, P.C. boards of remote controller must be modified according to the number of the indoor unit.

How to modify the remote controller P.C. board

Remove batteries before modification. The board has a print as shown below :

NOTE : For modification, take out

the batteries and press the OPERATE/STOP(ON/OFF) button twice or 3 times at first. After modification, put back the batteries then press

The P.C. board has the print “J1” and “J2”. Solder “J1” and “J2” according to the number of indoor unit as shown in Table 1. After modification, press the RESET button.

the RESET button.

Table 1

How to set the remote controller exclusively for particular indoor unit

After you turn the breaker ON, the first remote controller that sends the signal to the indoor unit will be regarded as the remote controller for the indoor unit. The indoor unit only accept the signal from the remote controller that has been assigned to the indoor unit once they are set. The setting will be cancelled if the breaker is turned OFF, or the power supply is shut down. Please conduct the above setting once again after the power has restored.

8-3. AUTO RESTART FUNCTION

8-4. REMOTE CONTROLLER

Be sure to set the slide switch inside the remote controller to an appropriate position in accordance with the installed position of the indoor unit. If the switch is not set correctly, the air conditioner may not function properly.

Area Left Center Right

Where is the indoor unit installed in your room?

NOTE:If the indoor unit is installed more than 50 cm away from the side walls, cabinets or other nearby objects, set the slide

switch to the “center” position.

(Left) (Center) (Right)

Slide swich

Position of

the slide

switch

Display on the remote

controller

Installed at left, if the distance is not more than 50 cm.

Installed at right, if the distance is not more than 50 cm.

Is the indoor unit installed at right, left or center?

JR07

CN151 CN211CN112 CN1R1

CN212

CN1T1

CN1U1

CN130

IC156

When the indoor unit is controlled with the remote controller, the operation mode, the set temperature, and the fan speed are memorized by the indoor electronic control P.C. board. “AUTO RESTART FUNCTION” automatically starts operation in the same mode just before the shutoff of the main power.

Operation

If the main power has been cut, the operation settings remain.

2 After the power is restored, the unit restarts automatically according to the memory.

(However, it takes at least 3 minutes for the compressor to start running.)

How to release “AUTO RESTART FUNCTION”

Turn OFF the main power for the unit.

2Solder the Jumper wire to JR07 on the indoor electronic control

P.C. board. (Refer to 10-7.)

NOTE :

• The operation settings are memorized when 10 seconds have passed after the indoor unit was operated with the remote

controller.

• If main power is turned OFF or a power failure occurs while AUTO START/STOP timer is active, the timer setting is can-

celled.

• If the unit has been OFF with the remote controller before power failure, the auto restart function does not work as the

power button of the remote controller is OFF.

• To prevent breaker OFF due to the rush of starting current, systematize other home appliance not to turn ON at the

same time.

• When some air conditioners are connected to the same supply system, if they are operated before power failure, the

starting current of all the compressors may flow simultaneously at restart. Therefore, the special counter-measures are required to prevent the main voltage-drop or the rush of the starting current by adding to the system that allows the units to start one by one.

ON TIMER button

CLOCK SET button

TIME SET buttons FORWARD button BACKWARD button

OFF TIMER button

RESET button

VANE CONTROL button

WIDE VANE button

(Vertical vane button)

CLEAN button

AREA button

i-see button

Signal transmitting section

Operation display section

OPERATE/STOP (ON/OFF) button

FAN SPEED CONTROL button

OPERATION SELECT button

ECONO COOL button

Indication of remote controller model is on back

PLASMA button

Temperature buttons

MICROPROCESSOR CONTROL

MSZ-FD25VA MSZ-FD25VAS MSZ-FD35VA MSZ-FD35VAS

WIRELESS REMOTE CONTROLLER

NOTE: Last setting will be stored after the unit is turned OFF with the remote controller. Indoor unit receives the signal of the

remote controller with beeps.

INDOOR UNIT LAMP

The lamps at the center of the indoor unit indicates the operation state.

Lamp

AREA

POWER

CLEAN

PLASMA

Operation state Refer to 9-7. Lamp lights during operation.

Lamp blinks in abnormal condition. Lamp lights during clean operation.

Refer to 9-9. Lamp lights during PLASMA operation.

Refer to 9-8.

9-1. COOL ( ) OPERATION

(1) Press OPERATE/STOP(ON/OFF) button.

POWER lamp of the indoor unit turns on with a beep tone. (2) Select COOL mode with OPERATION SELECT button. (3) Press TEMPERATURE buttons (TOO WARM or TOO COOL button) to select the desired temperature.

The setting range is 16 ~ 31 °C.

1. Coil frost prevention

The compressor operational frequency is controlled by the temperature of the indoor heat exchanger to prevent the coil from frosting. When the temperature of indoor heat exchanger becomes too low, the coil frost prevention mode works. The indoor fan operates at the set speed and the compressor stops. This mode continues until the temperature of indoor heat exchanger rises.

2. Low outside temperature operation

When the outside temperature is lower, low outside temperature operation starts, and the outdoor fan slows or stops.

9-2. DRY ( ) OPERATION

(1) Press OPERATE/STOP(ON/OFF) button.

POWER lamp of the indoor unit turns on with a beep tone. (2) Select DRY mode with OPERATION SELECT button. (3) The set temperature is determined from the initial room temperature.

1. Coil frost prevention

Coil frost prevention is as same as COOL mode. (9-1.1.)

2. Low outside temperature operation

Low outside temperature operation is as same as COOL mode. (9-1.2.)

9-3. HEAT ( ) OPERATION

(1) Press OPERATE/STOP(ON/OFF) button.

POWER lamp of the indoor unit turns on with a beep tone. (2) Select HEAT mode with OPERATION SELECT button. (3) Press TEMPERATURE buttons (TOO WARM or TOO COOL button) to select the desired temperature.

The setting range is 16 ~ 31 °C.

1. Cold air prevention control

When the compressor is not operating or is starting, and the temperature of indoor heat exchanger and/or the room tem-

perature is low or when defrosting is being done, the indoor fan will stop or rotate in Very Low speed.

2. High pressure protection

The compressor operational frequency is controlled by the temperature of the indoor heat exchanger to prevent the condensing pressure from increasing excessively. When the temperature of indoor heat exchanger becomes too high, the high pressure protection works. The indoor fan operates following the cold air prevention control. This mode continues until the temperature of indoor heat exchanger falls.

3. Defrosting

Defrosting starts when the temperature of outdoor heat exchanger becomes too low. The compressor stops once, the indoor/outdoor fans stop, the 4-way valve reverses, and the compressor re-starts. This mode continues until the temperature of outdoor heat exchanger rises or the fixed time passes.

9-4. AUTO CHANGE OVER ··· AUTO MODE OPERATION

Once desired temperature is set, unit operation is switched automatically between COOL and HEAT operation.

Mode selection

(1) Initial mode

When unit starts the operation with AUTO operation from off;

• If the room temperature is higher than the set temperature, operation starts in COOL mode.

• If the room temperature is equal to or lower than the set temperature, operation starts in HEAT mode.

(2) Mode change

COOL mode changes to HEAT mode when about 15 minutes have passed with the room temperature 2 °C below the set temperature. HEAT mode changes to COOL mode when about 15 minutes have passed with the room temperature 2 °C above the set temperature.

NOTE 1

If two or more indoor units are operating in multi system, there might be a case that the indoor unit, which is operating in (AUTO), cannot change over to the other operating mode (COOL HEAT) and becomes a state of standby. Refer to NOTE 2 “FOR MULTI SYSTEM AIR CONDITIONER”.

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