Mitsubishi Electronics MSZ-GB50VA User Manual
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
INDOOR UNIT
SERVICE MANUAL
Wireless type
Models
No. OB454
MSZ-GB50VA -
MSZ-GB50VA
E1
Outdoor unit service manual
MUZ-GB·VA series (OB455)
MXZ-A·VA series (OB377)
MXZ-8A140VA (OC316)
CONTENTS
1. TECHNICAL CHANGES ····································2
2. PART NAMES AND FUNCTIONS······················3
3. SPECIFICATION·················································5
4. NOISE CRITERIA CURVES·······························6
5. OUTLINES AND DIMENSIONS·························7
6. WIRING DIAGRAM ············································8
7. REFRIGERANT SYSTEM DIAGRAM················8
8. SERVICE FUNCTIONS ······································9
9. TROUBLESHOOTING······································10
10. DISASSEMBLY INSTRUCTIONS·····················24
11. RoHS PARTS LIST···········································27
12. OPTIONAL PARTS ···········································30
NOTE:
• This service manual describes technical data of the indoor units.
1
TECHNICAL CHANGES
MSZ-GA50VA - ➔ MSZ-GB50VA -
Indoor unit size has been changed. (W1,100 mm x H325 mm x D258 mm ➔ W780 mm x H298 mm x D210 mm)
E1E1
2
2
Line flow fan
Air outlet
Vertical vane
Air inlet
Display section
Front panel
Panel
Heat exchanger
Horizontal vane
Operation section
(When the front panel is opened)
Remote controller
Remote control
receiving section
Catechin air filter
Air cleaning filter (Option)
(Anti-Allergy Enzyme
Filter,Blue bellows type)
Emergency operation switch
Fan guard
Operation Indicator
lamp
PART NAMES AND FUNCTIONS
INDOOR UNIT
MSZ-GB50VA
3
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
MSZ-GB50VA
ACCESSORIES
REMOTE CONTROLLER
Signal transmitting section
Operation display section
OPERATE/STOP
(ON/OFF) button
Open the front lid.
FAN SPEED CONTROL button
OPERATION SELECT button
ECONO COOL button
RESET button
(This diagram shows an overall view.)
Temperature buttons
Indication of
remote controller
model is on back
OFF-TIMER button
ON-TIMER button
TIME SET buttons
FORWARD button
BACKWARD button
CLOCK SET button
VANE CONTROL button
4
3
MSZ-GB50VA
T3.15AL 250V
MSBPC20M16 12V DC 250" (at 25˚C)
ERZV14D471
3P
INDOOR UNIT
Item
Fuse
Horizontal vane motor
Varistor
Terminal block
(F11)
(MV)
(NR11)
(TB)
MSZ-GB50VA
Indoor model
Function
Power supply
Single phase
230V,50Hz
684
654/445/414
20
0.35
40
50
0.35
RC0J30-CC
780O298O210
9
4
1,300
1,200/1,100/900
4
KM05B
Cooling
48/44/38/32
Heating
48/42/36/30
Air flow(Super High)
Air flow(High/Med./Low)
Power outlet
Running current ✽1
Power input ✽1
Power factor ✽1
Fan motor current ✽1
Model
Dimensions WOHOD
Weight
Air direction
Sound level(Super High/High/Med./Low)
Fan speed(Super High)
Fan speed(High/Med./Low)
Fan speed regulator
Remote controller model
K /h
K /h
A
A
W
%
A
mm
kg
dB(A)
rpm
rpm
Electrical
data
Fan motor
Special
remarks
Capacity
SPECIFICATION
NOTE : Test conditions are based on ISO 5151.
Specifications and rating conditions of main electric parts
Cooling : Indoor Dry-bulb temperature 27:Wet-bulb temperature 19:
Outdoor Dry-bulb temperature 35:Wet-bulb temperature 24:
Heating : Indoor Dry-bulb temperature 20:Wet-bulb temperature 15:
Outdoor Dry-bulb temperature 7:Wet-bulb temperature 6:
Refrigerant piping length (one way): 5m
✽1 Measured under rated operating frequency.
5
5
OUTLINES AND DIMENSIONS
MSZ-GB50VA
INDOOR UNIT
298
53.5
58
780
19
11x26 Oblong hole
Installation plate
Indoor unit
102624.5
41.5 215
100
Air out
11x20 Oblong hole
335 320
Air in
210 5
or more7
155 155
Installation plate
90
106
Unit : mm
14273.5
5555 225 225
234
214
7055
42.5
Wall hole [65
Liquid line [8.0-0.5m
Gas line [9.52-0.43m
Insulation [35 O.D
{
[19 I.D
Drain hose [16
(Connected part O.D)
Insulation [28
287.5
3
159
Required space (Indoor unit)
75 or more
10 or more
75 or more
W
66 or more
In case of left, left back, or
W
left under piping (using spacer),
115 or more
6
4
90
80
70
60
50
40
30
20
10
63 125 250 500 1000 2000 4000 8000
OCTAVE BAND SOUND PRESSURE LEVEL, 0dB=20µPa
BAND CENTER FREQUENCIES, Hz
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
Test conditions,
Cooling : Dry-bulb temperature 27: Wet-bulb temperature 19:
48
SPL(dB(A)) LINE
High
FAN SPEED
Heating : Dry-bulb temperature 20: Wet-bulb temperature 15:
INDOOR UNIT
WALL
MICROPHONE
0.8m
1m
NOISE CRITERIA CURVES
MSZ-GB50VA
7
6
Indoor
heat
exchanger
Flared connection
Room temperature
thermistor
RT11
Indoor coil
thermistor
RT13(sub)
Flared connection
Refrigerant flow in cooling
Refrigerant flow in heating
Refrigerant pipe [12.7
(with heat insulator)
Refrigerant pipe [6.35
(with heat insulator)
Indoor coil
thermistor
RT12(main)
Distributor
4
3
2
1
S2
POWER MONITOR
RECEIVER P.C.BOARD
2
6
230V~
BLU
INDOOR ELECTRONIC
CONTROL P.C. BOARD
SW P.C.
BOARD
INTERLOCK
SWITCH(FAN)
5
MV
TO OUTDOOR
UNIT
CONNECTING
BLK
RED
S3
TB
TAB3
DB111
NR11
F11
5
6
4
2
2
LD
105(T)
LD
101(A)
12-24V
RT13
1R1
CN
GRN
LD104
CN201
2
1
151
CN
T111
RED
WHT
111
CN
CN
112
CN211
BLU
YLW
BLK
MF
RT11
RT12
1
3
5
S1
WIRING DIAGRAM
MSZ-GB50VA
INDOOR UNIT
7
REFRIGERANT SYSTEM DIAGRAM
MSZ-GB50VA
INDOOR UNIT
SYMBOL
DB111
F11
MF
MV
NR11
NOTE:1. About the outdoor side electric wiring refer to the outdoor unit electric wiring diagram for servicing.
DIODE STACK
FUSE (T3.15AL250V)
INDOOR FAN MOTOR
VANE MOTOR (HORIZONTAL)
VARISTOR
2. Use copper conductors only. (For field wiring)
3. Symbols below indicate.
/: Terminal block, : Connector
NAME
SYMBOL
RT11
RT12
RT13
T111
TB
ROOM TEMPERATURE THERMISTOR
INDOOR COIL THERMISTOR (MAIN)
INDOOR COIL THERMISTOR (SUB)
TRANSFORMER
TERMINAL BLOCK
NAME
Unit : mm
8
8
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-GB50VA
8-1. TIMER SHORT MODE
For service, set time can be shortened by short circuit of JPG and JPS the electronic control P.C. board.
The time will be shortened as follows. (Refer to 9-7.)
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 remodelling, take out
the batteries and press the
OPERATE/STOP(ON/OFF)
button twice or 3 times at
first.
After finish remodelling,
put back the batteries then
press the RESET button.
J1
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.
J2
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 will 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 has turned off, or the power supply has shut down.
Please conduct the above setting once again after the power has restored.
9
Housing point
JR07
CN151 CN211CN112 CN1R1
BZ
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. The “AUTO RESTART FUNCTION” sets to work the moment
power has restored after power failure. Then, the unit will restart automatically.
Operation
1 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”
1Turn off the main power for the unit.
2Solder the Jumper wire JR07 on the indoor electronic control P.C. board. (Refer to 9-7.)
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
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 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.
9
TROUBLESHOOTING
MSZ-GB50VA
9-1. Cautions on troubleshooting
1. Before troubleshooting, check the following:
1) Check the power supply voltage.
2) Check the indoor/outdoor connecting wire for mis-wiring.
2. Take care the following during servicing.
1) Before servicing the air conditioner, be sure to turn off the unit first with the remote controller, and then after
confirming the horizontal vane is closed, turn off the breaker and / or disconnect the power plug.
2) Be sure to turn OFF the power supply before removing the front panel, the cabinet, the top panel, and the
electronic control P.C. board.
3) When removing the electronic control P.C. board, hold the edge of the board with care NOT to apply stress on the
components.
4) When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires.
Lead wiring
10
Loading...