Mitsubishi Electric MSZ-AY25VGKP-E6 User manual

SERVICE MANUAL
INDOOR UNIT
PARTS CATALOG (OBB930)
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·····································8
7. REFRIGERANT SYSTEM DIAGRAM ···········10
8. SERVICE FUNCTIONS······························ 11
9. MICROPROCESSOR CONTROL·················17
10. TROUBLESHOOTING·······························25
11. DISASSEMBLY INSTRUCTIONS·················41
Models
MSZ-AY25VGK - E6 MSZ-AY25VGKP - E6
MSZ-AY35VGK - E6 MSZ-AY35VGKP - E6
MSZ-AY42VGK - E6 MSZ-AY42VGKP - E6
MSZ-AY50VGK - E6 MSZ-AY50VGKP - E6
Outdoor unit service manual
MUZ-AY∙VG/VGH Series (OBH931)
MXZ-F∙VF/VFH Series (OBH790)
No. OBH930

2
Use the specied refrigerant only
Never use any refrigerant other than that specified.
Doing so may cause a burst, an explosion, or fire when the unit is being used, serviced, or disposed of.
Correct refrigerant is specified in the manuals and on the spec labels provided with our products.
We will not be held responsible for mechanical failure, system malfunction, unit breakdown or accidents caused by failure to
follow the instructions.
<Preparation before the repair service>
Prepare the proper tools.
Prepare the proper protectors.
Provide adequate ventilation.
After stopping the operation of the air conditioner, turn off the power-supply breaker and pull the power plug.
Discharge the capacitor before the work involving the electric parts.
<Precautions during the repair service>
Do not perform the work involving the electric parts with wet hands.
Do not pour water into the electric parts.
Do not touch the refrigerant.
Do not touch the hot or cold areas in the refrigeration cycle.
When the repair or the inspection of the circuit needs to be done without turning off the power, exercise great caution not to
touch the live parts.
WARNING
• When the refrigeration circuit has a leak, do not execute pump down with the compressor.
• When pumping down the refrigerant, stop the compressor before disconnecting the refrigerant pipes.
The compressor may burst if air etc. get into it.
• When opening or closing the valve below freezing temperatures, refrigerant may spurt out from the gap
between the valve stem and the valve body, resulting in injuries.
OBH930

3
TECHNICAL CHANGES1
These models are compatible with the outdoor units with low standby power control.
Connecting these models to the MUZ-AY·VG/VGH series outdoor units enables the low standby power control.
These models may be connected to the MUZ-AY·VG/VGH series after once connected to the MXZ series and operated, for
example because of relocation. In that case, the MUZ-AY·VG/VGH series outdoor units will not operate without taking a step.
Follow the procedure “Deleting the memorized abnormal condition” described in 10-2.1.
MSZ-AY25VGK - E6
MSZ-AY35VGK - E6
MSZ-AY42VGK - E6
MSZ-AY50VGK - E6
MSZ-AY25VGKP - E6
MSZ-AY35VGKP - E6
MSZ-AY42VGKP - E6
MSZ-AY50VGKP - E6
1. New model
OBH930

4
PART NAMES AND FUNCTIONS2
ACCESSORIES
MSZ-AY25VGK MSZ-AY35VGK MSZ-AY42VGK MSZ-AY50VGK
MSZ-AY25VGKP MSZ-AY35VGKP MSZ-AY42VGKP MSZ-AY50VGKP
Model MSZ-AY25VGK MSZ-AY35VGK MSZ-AY42VGK MSZ-AY50VGK
MSZ-AY25VGKP MSZ-AY35VGKP MSZ-AY42VGKP MSZ-AY50VGKP
(1) Installation plate 1
(2) Installation plate xing screw 4 × 25 mm 5
(3) Wireless remote controller 1
(4) Felt tape (For left or left-rear piping) 1
(5) Battery (AAA) for remote controller 2
(6) Air cleaning lter 2 (VGK only)
*1
The manufacturing year and
month
are indicated on the
spec name plate.
Emergency operation switch
Operation indicator lamp
Air purifying lamp (VGKP type only)
Remote control receiving
section
Horizontal vane
Air filter
Front panel
Spec name plate *1
Heat exchanger
Fan guard
Air outlet
Air cleaning filter
(V Blocking Filter)
Air purifying device
(VGKP type only)
Wi-Fi interface
Air inlet
Remote controller
OBH930

5
SPECIFICATION3
Specifications and rated conditions of main electric parts
Fuse (F11) T3.15AL250V
Horizontal vane motor (MV1, MV2) 12 V DC
Vertical Vane motor (MV3) 12 V DC
Varistor (NR11) 470 V
Terminal block (TB) 3P
Indoor model MSZ-AY25VGK
MSZ-AY25VGKP MSZ-AY35VGK MSZ-AY35VGKP MSZ-AY42VGK MSZ-AY42VGKP MSZ-AY50VGK MSZ-AY50VGKP
Power supply Single phase 230 V, 50 Hz
Electrical data
Power
input *1 Cooling W19 24
Heating 26 32
Running
current *1 Cooling A0.18 0.24
Heating 0.26 0.32
Fan motor
Model RC0J30CV
Current *1 Cooling A0.18 0.24
Heating 0.26 0.32
Dimensions W × H × D mm 798 × 299 × 245
Weight kg VGK: 10.5
VGKP: 11
Special remarks
Air direction 5
Airow
Cooling
Super High
m3/h
630 666 630 702
High 468 504 546
Med. 378 420 450
Low 300 342 384
Silent 216 270 312
Heating
Super High
m3/h
708 774
High 480 516 546
Med. 396 420 438
Low 300 318 342
Silent 240 264 288
Sound level
Cooling
Super High
dB(A)
42 44
High 36 38 40
Med. 30 34 36
Low 24 29 33
Silent 18 21 28
Heating
Super High
dB(A)
45 48
High 39 38 40 43
Med. 34 31 35 38
Low 24 29 33
Silent 18 21 28
Fan speed
Cooling
Super High
rpm
940 980 940 1,020
High 760 800 850
Med. 650 700 740
Low 560 610 660
Silent 450 520 570
Heating
Super High
rpm
1,030 1,100
High 770 810 850
Med. 670 700 720
Low 560 580 610
Silent 480 510 540
Fan speed regulator 5
Remote controller model VGK: SH22Q
VGKP: SH22R
NOTE: Test conditions are based on ISO 5151.
Cooling: Indoor Dry-bulb temperature 27°C Wet-bulb temperature 19°C
Outdoor Dry-bulb temperature 35°C Wet-bulb temperature 24°C
Heating: Indoor Dry-bulb temperature 20°C Wet-bulb temperature 15°C
Outdoor Dry-bulb temperature 7°C Wet-bulb temperature 6°C
*1 Measured under rated operating frequency.
OBH930

6
NOISE CRITERIA CURVES4
MSZ-AY25VGK
MSZ-AY25VGKP
BAND CENTER FREQUENCIES, Hz
63 125 250 500 1000 2000 4000 8000
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
90
80
70
60
50
40
30
20
10
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
FAN SPEED FUNCTION SPL(dB(A)) LINE
Super High COOLING
HEATING
42
45
MSZ-AY35VGK
MSZ-AY35VGKP
BAND CENTER FREQUENCIES, Hz
63 125 250 500 1000 2000 4000 8000
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
90
80
70
60
50
40
30
20
10
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
FAN SPEED FUNCTION SPL(dB(A)) LINE
Super High COOLING
HEATING
42
45
Test conditions
Cooling: Dry-bulb temperature 27°C
Wet-bulb temperature 19°C
Heating: Dry-bulb temperature 20°C
INDOOR UNIT WALL
MICROPHONE
0.8m
1m
MSZ-AY42VGK
MSZ-AY42VGKP
BAND CENTER FREQUENCIES, Hz
63 125 250 500 1000 2000 4000 8000
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
90
80
70
60
50
40
30
20
10
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
FAN SPEED FUNCTION SPL(dB(A)) LINE
Super High COOLING
HEATING
44
48
MSZ-AY50VGK
MSZ-AY50VGKP
BAND CENTER FREQUENCIES, Hz
63 125 250 500 1000 2000 4000 8000
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
90
80
70
60
50
40
30
20
10
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
FAN SPEED FUNCTION SPL(dB(A)) LINE
Super High COOLING
HEATING
42
45
OBH930

7
OUTLINES AND DIMENSIONS5
MSZ-AY25VGK MSZ-AY35VGK MSZ-AY42VGK MSZ-AY50VGK
MSZ-AY25VGKP MSZ-AY35VGKP MSZ-AY42VGKP MSZ-AY50VGKP Unit: mm
Piping
ø37 O.D
ø6.35 - 0.39m (Flared connection ø6.35)
ø9.52 - 0.34m (Flared connection ø9.52)
Insulation ø29 Connected part ø16 O.D
Insulation
Liquid line
Gas line
Drain hose
OBH930

8
WIRING DIAGRAM6
MSZ-AY50VGK
MSZ-AY25VGK MSZ-AY35VGK MSZ-AY42VGK
OBH930

9
MSZ-AY50VGKP
MSZ-AY25VGKP MSZ-AY35VGKP MSZ-AY42VGKP
OBH930

10
REFRIGERANT SYSTEM DIAGRAM7
Indoor
heat
exchanger
Flared connection
Room temperature
thermistor
RT11
Flared connection
Refrigerant pipe ø9.52
(with heat insulator)
Refrigerant pipe ø6.35
(with heat insulator)
Indoor coil
thermistor
RT12 (main)
Indoor coil
thermistor
RT13 (sub)
Refrigerant flow in cooling
Refrigerant flow in heating
Unit: mm
Indoor
heat
exchanger
Flared connection
Room temperature
thermistor
RT11
Flared connection
Refrigerant pipe ø9.52
(with heat insulator)
Refrigerant pipe ø6.35
(with heat insulator)
Indoor coil
thermistor
RT12 (main)
Indoor coil
thermistor
RT13 (sub)
Refrigerant flow in cooling
Refrigerant flow in heating
MSZ-AY25VGK MSZ-AY35VGK
MSZ-AY25VGKP MSZ-AY35VGKP
MSZ-AY42VGK MSZ-AY50VGK
MSZ-AY42VGKP MSZ-AY50VGKP
OBH930

11
SERVICE FUNCTIONS8
8-1. TIMER SHORT MODE
For service, the following set time can be shortened by bridging the timer short mode point on the electronic control P.C.
board.
(Refer to 10-7.)
• The set time for the ON/OFF timer can be reduced to 1 second for each minute.
• After the breaker is turned on, the time for starting the compressor, which normally takes 3 minutes, can be reduced to 1
minute. Restarting the compressor, which takes 3 minutes, cannot be reduced.
8-2. HOW TO SET REMOTE CONTROLLER EXCLUSIVELY FOR A PARTICULAR INDOOR UNIT
A maximum of 4 indoor units with wireless remote controllers can be used in a room.
To operate the indoor units individually with each remote controller, assign a number to each remote controller according to
the number of the indoor unit.
This setting can be set only when all the following conditions are met:
• The remote controller is powered OFF.
• Weekly timer is not set.
• Weekly timer is not being edited.
(1) Hold down button on the remote controller for 2 seconds to enter the pairing mode.
(2) Press button again and assign a number to each remote controller.
Each press of button advances the number in the following order: 1 → 2 → 3 → 4.
(3) Press button to complete the pairing setting.
After you turn the breaker ON, the remote controller that first sends a signal to an indoor unit will be regarded as the
remote controller for the indoor unit.
Once they are set, the indoor unit will only receive the signal from the assigned remote controller afterwards.
8-3. AUTO RESTART FUNCTION
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.
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 disable “AUTO RESTART FUNCTION”
Turn off the main power for the unit.
Cut the jumper wire to JR77 on the indoor electronic control P.C. board.
(Refer to 10-7.)
JR77
Indoor electronic
control P.C. board
LD201(M)
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
cancelled.
• 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 start-
ing 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.
MSZ-AY25VGK MSZ-AY35VGK MSZ-AY42VGK MSZ-AY50VGK
MSZ-AY25VGKP MSZ-AY35VGKP MSZ-AY42VGKP MSZ-AY50VGKP
OBH930

12
1. Wi-Fi interface introduction
2. Setting up
3. Selecting a mode
3-1. Setting up in WPS-PUSH mode
Set up a connection between the Wi-Fi interface and the
router.
NOTE:
Setup is possible only after operating the air conditioner
using the wireless remote controller.
The Wi-Fi interface has to be paired with the router in
order for communication between the indoor unit and
MELCloud to begin. There are 2 methods of pairing the
Wi-Fi interface with the router:
• WPS-PUSH mode
• Access Point mode
The mode to be set depends on whether your router has
the WPS button.
Use the pairing mode most suitable for your system.
Follow the instructions below to set the pairing mode with
Remote controller.
Set up the Wi-Fi interface and the router again when the
router has been replaced.
To reset connection and set up the Wi-Fi interface and the
router again
(1) Hold down the Temperature
for 5 seconds.
(2) Select “_ 2” by pressing Tempera-
ture
and .
(3) Point the remote controller
toward t
he indoor unit and press
the .
(4) The indoor unit beeps 3 times
when resetting is complete.
Make sure that the LED indication is as shown
below.
Push WPS button of the router within 2 minutes
after the mode selection has completed.
The WPS-PUSH mode will return to initial state
if WPS button is not pressed for 2 minutes.
3-1.1. Connect the router to the air conditioner.
NOTE:
If the indication LED does not change or blinks 5 times,
connection fails. Please reset connection and setup the
Wi-Fi interface and the router again.
Main causes that WPS failed are as follows.
Communication distance (from the Wi-Fi interface to
router), router settings (encryption, authentication, limit
of connections, etc.)
For MELCloud User Manual, please go to the website
below.
www.melcloud.com/Support
(1) Hold down the Temperature for
5 seconds.
(2) Select “¯ 2” by pressing
Temperature and as shown
on the right.
(3)
Point the remote controller
toward the indoor unit and press
the .
3-1-2. LED will be as shown below when connection
between the router and Wi-Fi interface is
completed and connection to MELCloud starts.
To enter the mode WPS-Push mode
The LED lights up for 3 seconds
then blinks twice.
A beep sounds as the LED blinks.
This series of actions is repeated.
The LED lights up for 5 seconds
and then a beep sounds for 1 second.
NET LED
It shows the network state.
(Refer to 8-4.3-3. NET LED.)
Wi-Fi interface
Front panel
Wi-Fi interface
ThisWi-Fi interface,communicates the statusinformationand
controls the commands from the MELCloud by connecting to the
indoor unit.
Connecting
Router
Connected
Connecting
MELCloud
8-4. Wi-Fi INTERFACE SETTING UP
OBH930

13
3-2. Setting up in Access Point mode
Make sure that the LED indication is as shown below.
On the Wi-Fi Setting Screen on your smartphone,
select SSID and enter KEY, which are printed on the
information label.
3-2.1. Connect your smartphone to the air conditioner.
To enter the mode
(1) Hold down the Temperature
for 5 seconds.
(2)
Select “¯ 1” by pressing
Temperature and as shown
on the right.
(3)
Point the remote controller
toward the indoor unit unit and
press the .
(1)
Scan the matrix barcode below.
(2)
Scan the matrix barcode on the information label.
(3)
Type the URL (http://192.168.11.1/network) in the
web browser.
NOTE:
• Check Wi-Fi setting of your smartphone if SSID does not
appear on it.
• Enter KEY again if SSID appears on your smartphone,
but it cannot connect to the Wi-Fi interface.
• The LED indication does not change or blinks 5 times if
connection fails. In that case, reset connection and set
up the Wi-Fi interface and the router again.
3-2.3. Register the information of the router on the air
conditioner.
In the displayed window, select Dynamic in
DHCP (*1) and enter the information of router,
then tap the Submit button.
NOTE:
It may take several minutes to show the indication above.
The LED indication does not change or blinks 5 times if
connection fails.
In that case, reset connection and set up the Wi-Fi interface
and the router again.
NOTE:
• If you want to use Static, select Static in DHCP (*1) and
enter the information of router and network, then tap the
Submit button.
3-2.4. LED indication will be as shown below when
connection between the router and Wi-Fi interface is
completed and connection to MELCloud starts.
3-2.2. Access URL (http://192.168.11.1/network) by any of
the following methods to display the setting screen.
Complete the setting up in the Access Point mode within
10 minutes.
Access Point mode
The LED lights up for 3 seconds
then blinks once.
A beep sounds as the LED blinks.
This series of actions is repeated.
E.O.
SW
MAC:
ID:
SSID:
KEY:
XXXXXXXXXXXX
XXXXXXXXXX
ME-XXXXXXXXXX
XXXXXXXXXXXX
Information label
Other
Wi-Fi interface
(*1)
Router
Connecting
Connecting
MELCloud
The LED lights up for 5 seconds and
then a beep sounds for 1 second.
E.O.
SW
MAC:
ID:
SSID:
KEY:
XXXXXXXXXXXX
XXXXXXXXXX
ME-XXXXXXXXXX
XXXXXXXXXXXX
SSID:
KEY:
ME-XXXXXXXXXX
XXXXXXXXXXXX
Connecting
SmartphoneOtherWi-Fi interface
Connected
Connecting
OBH930

14
3-3. NET LED
NOTE:
• Ensure that the router supports the WPA2-AES
encryption setting before starting the Wi-Fi interface
setup.
• The End user should read and accept the terms and
conditions of the Wi-Fi service before using this Wi-Fi
interface.
• To complete connection of this Wi-Fi interface to the
Wi-Fi service, the router may be required.
• This Wi-Fi interface will not commence transmission
of any operational data from the system until the End
user registers and accepts the terms and conditions
of the Wi-Fi service.
• This Wi-Fi interface should not be installed and
connected to any Mitsubishi Electric system which is
to provide application critical cooling or heating.
• At the time of relocation or disposal, reset the Wi-Fi
interface to the factory default.
NET LED blinking indicates that the Wi-Fi interface is
communicating with the router.
3-4. When it doesnʼt connect well
Check the following, and pair the Wi-Fi interface and
the router according to Selecting a mode.
•
Make sure that the communication distance is not too
far between
the Wi-Fi interface and the router.
• Make sure that the router uses WPA2-AES encryp-
tion.
• Make sure that the number of connected devices to
the router does not exceed the limit.
• Make sure that DHCP is enabled, or check IP
address setting of the Wi-Fi interface.
• Check DNS settings of the router, or check DNS
address of the Wi-Fi interface.
• Check if the router is connected to Internet.
• Set up the Wi-Fi interface after operating the air
conditioner using the wirelessremote controller at
least once.
If the connection fails even after checking the above,
set up the Wi-Fi interface and the router again by the
following method.
• Hold down the Temperature for 5 seconds.
• Select “_ 2” by pressing Temperature and .
• Point the remote controller toward the indoor unit and
press the
.
• The indoor unit beeps 3 times when resetting is
complete.
[About trademarks]
• WPS is the connection via Wi-Fi Protected Setup.
• “Wi-Fi®”, “Wi-Fi Protected Setup™”, “WPA2™” are
trademarks or registered trademarks of the Wi-Fi
Alliance.
For Declaration of Conformity and MELCloud User
Manual, please go to the website below.
www.melcloud.com/Support
After accessing the address above, select “United
Kingdom” to view support details.
The Wi-Fi interface uses Open Source Software.
To view the Open Source software licence(s), please
go to the following website whilst connected to the
Wi-Fi interface during the Access Point mode.
http://192.168.11.1/license
For the latest information regarding MELCloud from
Mitsubishi Electric Corporation, please visit
https://www.melcloud.com.
.
OBH930

15
The correction value of the room temperature can be adjusted in the range of 2 to 5 °C with the remote controller.
Normally, the temperature at the room temperature sensor might become higher than that around feet because warm air
tends to accumulate around an indoor unit during heating operation.
Thus, if you correct the room temperature to the temperature about 2 °C lower than that detected by the room temperature
sensor, the air conditioner capacity during heating operation increases, which suppresses a decrease in the temperature
around feet.
The optimal correction values of the room temperature, however, might differ depending on the installation environments
such as installation height of the indoor unit or the ceiling height, so adjust the correction value of the room temperature in
the range of 2 to 5 °C with the remote controller.
NOTE 1: The room will be warmer if you set the correction value of the room temperature to 5°C.
8-5. CHANGING THE CORRECTION VALUE OF THE ROOM TEMPERATURE (THE INLET TEMPERATURE)
1. How to change the correction value of the room temperature
(1) Press [ OFF/ON] button on the remote controller to turn the indoor unit off. (Figure 1)
(2) Point the remote controller at the indoor unit.
While you hold down [ MODE] and [ TEMP ] at the same time, press [ RESET], and keep holding
[ MODE] and [ TEMP ] to indicate the correction value of the room temperature that was set the last time with
the remote controller (Figure 2 shows 2°C at factory setting).
NOTE 2: Point the remote controller at the indoor unit while working in the procedure (3) and (4) like the procedure
(2).
(3) Press [ TEMP ] or [ TEMP ] to change the correction value of the room temperature.
(4) Set the correction value of the room temperature to the desired value, and then press [ OFF/ON] button on the
remote controller to turn the indoor unit off. (Figure 1)
TEMP [ ] TEMP [ ] TEMP [ ]
TEMP [ ] TEMP [ ] TEMP [ ]
[Figure 1] [Figure 2]
OBH930

16
MSZ-AY25/35/42VGKP WIRING DIAGRAM
MODEL
Bold square
[Figure 3]
2. Writing the correction value of the room temperature on the wiring diagram
After setting the correction value of the room temperature (the inlet air temperature), follow 11. DISASSEMBLY
INSTRUCTIONS to disassemble the indoor unit, and then write the correction value (any of 3, 4, or 5) on the wiring dia-
gram with a ballpoint pen, etc.
(e.g. The numerical value is described in the bold square.) (Figure 3)
If the indoor electronic control P.C. board is replaced in servicing, the correction value is reset. The numerical value (any
of 3, 4, or 5) described on the wiring diagram will be needed when a service man sets the correction value again after
replacing the P.C. board.
NOTE 3: The instruction for setting the correction value again is attached to the indoor electronic control P.C. board of
the service part as well.
If you cut the jumper wire JR24 (Refer to 10-7.), a correction value of the room temperature during heating operation turns
to 0°C regardless of the correction commands from the remote controller. (Figure 4)
[Figure 4]
JR24
CN112 CN112
CN211
CN151 CN111
Indoor electronic
control P.C. board
OBH930

17
MICROPROCESSOR CONTROL9
Operation Indicator lamp
The operation indicator at the right side of the indoor unit indicates the operation state.
• The following indication applies regardless of shape of the indication.
Indication Operation state Room temperature
The unit is operating to reach the set
temperature (VGK only) About 2°C or more away from set temperature
The room temperature is approaching
the set temperature (VGK only) About 1 to 2°C from set temperature
Lower lamp lights during clean operation.
Refer to 9-13. —
Standby mode
(Only during multi system operation) —
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 DISPLAY SECTION
Lit
Blinking
Not lit
9-1. COOL ( ) OPERATION
(1) Press OFF/ON (stop/operate) button.
OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone.
(2) Select COOL mode with Operation select button.
(3) Press Temperature buttonsTEMP or 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.
MSZ-AY25VGK MSZ-AY35VGK MSZ-AY42VGK MSZ-AY50VGK
MSZ-AY25VGKP MSZ-AY35VGKP MSZ-AY42VGKP MSZ-AY50VGKP
Signal transmitting section
Temperature buttons
OFF/ON (stop/operate)
button
Indication of
remote controller
model is on back
FAN speed control button
Operation select button
ECONO COOL button
CLOCK button
WEEKLY TIMER
set button
TIME, TIMER set buttons
forward button
backward button
RESET button
i-save button
NIGHT MODE button
Distance of signal : About 6 m
Beep(s) is (are) heard from
the indoor unit when the
signal is received.
PURIFIER button
(VGKP type only)
Battery replacement indicator
Operation display section WIDE VANE button
VANE control button
SELF CLEAN button
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2. Low outside temperature operation
When the outside temperature is lower, low outside temperature operation starts, and the outdoor fan slows or stops.
3. Indoor fan speed control
When the thermostat turns OFF, the indoor fan operates very Low to reduce power consumption.
When the room temperature rises and the thermostat is ON, the indoor fan operates according to the settings on the
remote controller.
9-2. DRY ( ) OPERATION
(1) Press OFF/ON (stop/operate) button.
OPERATION INDICATOR 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 works the same way as that in COOL mode. (9-1.1.)
2. Low outside temperature operation
Low outside temperature operation works the same way as that in COOL mode. (9-1.2.)
3. Indoor fan speed control
Indoor fan speed control works the same way as that in COOL mode. (9-1.3.)
9-3. FAN ( ) OPERATION
(1) OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone.
(2) Select FAN mode with Operation select button.
(3) Select the desired fan speed. When AUTO, it becomes Low.
Only indoor fan operates.
Outdoor unit does not operate.
9-4. HEAT ( ) OPERATION
(1) Press OFF/ON (stop/operate) button.
OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone.
(2) Select HEAT mode with Operation select button.
(3) Press Temperature buttonsTEMP or button to select the desired temperature. The setting range is 10 - 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 con-
densing 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.
9-5. 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 1°C below the set
temperature.
HEAT mode changes to COOL mode when about 15 minutes have passed with the room temperature 1°C above the set
temperature.
NOTE 1
If 2 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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NOTE 2
FOR MULTI SYSTEM AIR CONDITIONER
OUTDOOR UNIT: MXZ series
Multi system air conditioner can connect 2 or more indoor units with 1 outdoor unit.
• When you try to operate 2 or more indoor units with 1 outdoor unit simultaneously, one for the cooling and the others for
heating, the operation mode of the indoor unit that operates first is selected. Other indoor units cannot operate, and
operation indicator lamp blinks as shown in the figure below. In this case, please set all the indoor units to the same
operation mode. OPERATION INDICATOR
Lit
Blinking
Not lit
• When indoor unit starts the operation while the defrosting of outdoor unit is being done, it takes a few minutes (max. 10
minutes) to blow out the warm air.
• In the heating operation, though indoor unit is not operating, it may get warm or the sound of refrigerant flow may be
heard. It is not malfunction. The reason is that the refrigerant continuously flows into it.
9-6. AUTO VANE OPERATION
1. Horizontal vane
(1) Vane motor drive
These models are equipped with a stepping motor for the horizontal vane. The rotating direction, speed, and angle of
the motor are controlled by pulse signals (approximately 12 V) transmitted from indoor microprocessor.
(2) The horizontal vane angle and mode change as follows by pressing Up-down airflow control button.
(AUTO) (1) (2) (3) (4) (5) (SWING)
(3) Positioning
To confirm the standard position, the vane moves until it touches the vane stopper. Then the vane is set to the selected
angle.
Confirming of standard position is performed in the following cases:
(a) When the operation starts or finishes (including timer operation).
(b) When the test run starts.
(c) When standby mode (only during multi system operation) starts or finishes.
(4) VANE AUTO ( ) mode
In VANE AUTO mode, the microprocessor automatically determines the vane angle to make the optimum room temper-
ature distribution.
In COOL and DRY operation
Vane angle is fixed to Horizontal position.
In HEAT operation
Vane angle is fixed to Angle 4.
Horizontal
position
4
(5) STOP (operation OFF) and ON TIMER standby
In the following cases, the horizontal vane returns to the closed position.
(a) When OFF/ON (stop/operate) button is pressed (POWER OFF).
(b) When the operation is stopped by the emergency operation.
(c) When ON TIMER is ON standby.
(6) Dew prevention
During COOL or DRY operation with the vane angle at Angle 5 when the compressor cumulative operation time
exceeds 1 hour, the vane angle automatically changes to Angle 4 for dew prevention.
(7) SWING ( ) mode
By selecting SWING mode with Up-down airflow control button, the horizontal vanes swing vertically.
When COOL, DRY or FAN mode is selected, only the upper vane swings.
(8) Cold air prevention in HEAT operation
The horizontal vane position is set to upward.
NOTE: When 2 or more indoor units are operated with multi outdoor unit, even if any indoor unit turns thermostat off,
this control does not work in the indoor unit.
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(9) ECONO COOL ( ) operation (ECONOmical operation)
When ECONO COOL button is pressed in COOL mode, set temperature is automatically set 2°C higher by the
microprocessor. (However, the temperature on the LCD screen on the remote controller is not changed.)
Also the horizontal vane swings in various cycle.
SWING operation makes you feel cooler than set temperature. So, even though the set temperature is higher, the air
conditioner can keep comfort. As a result, energy can be saved.
To cancel this operation, select a different mode or press one of the following buttons in ECONO COOL operation:
ECONO COOL, or Up-down airflow control button.
2. Vertical vane
(1) Vane motor drive
These models are equipped with a stepping motor for the vertical vane. The rotating direction, speed, and angle of the
motor are controlled by pulse signals (approximately 12 V) transmitted from microprocessor.
(2) The vertical vane angle and mode change as follows by pressing Left-right airflow control button.
1 2 3 4 5
(SWING)
(3) Positioning
To confirm the standard position, the vane moves until it touches the vane stopper. Then the vane is set to the selected
angle.
Confirmation of standard position is performed in the following cases:
(a) OFF/ON (stop/operate) button is pressed (POWER ON).
(4) SWING ( ) MODE
By selecting SWING mode with Left-right airflow control button, the vertical vane swings horizontally. The remote con-
troller displays “ ”. Swing mode is cancelled when Left-right airflow control button is pressed once again.
9-7. TIMER OPERATION
1. How to set the time
(1) Check that the current time is set correctly.
NOTE: Timer operation will not work without setting the current time. Initially “0:00” blinks at the current time display of
TIME MONITOR, so set the current time correctly with CLOCK button.
How to set the current time
(a) Press the CLOCK button.
(b) Press the TIME SET buttons ( and ) to set the current time.
• Each time FORWARD button ( ) is pressed, the set time increases by 1 minute, and each time BACKWARD
button ( ) is pressed, the set time decreases by 1 minute.
• Pressing those buttons longer, the set time increases/decreases by 10 minutes.
(c) Press the CLOCK button.
(2) Press OFF/ON (stop/operate) button to start the air conditioner.
(3) Set the time of timer.
ON timer setting
(a) Press ON TIMER button( ) during operation.
(b) Set the time of the timer using TIME SET buttons ( and ). *
OFF timer setting
(a) Press OFF TIMER button ( ) during operation.
(b) Set the time of the timer using TIME SET buttons ( and ).*
* Each time FORWARD button ( ) is pressed, the set time increases by 10 minutes: each time BACKWARD button
() is pressed, the set time decreases by 10 minutes.
2. To release the timer
To release ON timer, press ON TIMER button ( ).
To release OFF timer, press OFF TIMER button( ).
TIMER is cancelled and the display of set time disappears.
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