Mitsubishi Electric MS-GD80VB-E1 User manual

CONTENTS
1. TECHNICAL CHANGES ··································· 2
2. PART NAMES AND FUNCTIONS····················· 2
3. SPECIFICATION················································ 3
4. NOISE CRITERIA CURVES ······························ 3
5. OUTLINES AND DIMENSIONS ························ 4
6. WIRING DIAGRAM············································ 4
7. REFRIGERANT SYSTEM DIAGRAM ··············· 5
8. SERVICE FUNCTIONS ····································· 6
9. MICROPROCESSOR CONTROL ····················· 8
10. TROUBLESHOOTING····································· 14
11. DISASSEMBLY INSTRUCTIONS···················· 23
SPLIT-TYPE AIR CONDITIONERS
MS-GD80VB - E1
SERVICE MANUAL
Wireless type
Model
INDOOR UNIT
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
Outdoor unit service manual
MU-GD•VB Series (OBH512)
No. OBH511
REVISED EDITION-A
PARTS CATALOG (OBB511)
Revision A:
• Another type of the electronic control P.C.
board (TYPE 2) has been added to the
original one (TYPE 1). They are both com-
patible with MS-GD80VB- E1 .
Please void OBH511.

TECHNICAL CHANGES
2
1
PART NAMES AND FUNCTIONS
2
Front panel
(When the grille is opened)
Remote controller
Operation section Display section
Emergency operation switch
Operation indicator lamp
Air inlet
To breaker
Power supply cord
Remote control
receiving section
Air cleaning filter (option)
(White bellows type)
Horizontal vane
Vertical vanes
Catechin air filter
Remote control
receiving section
Catechin air filter
Panel
MS-GD80VB
ACCESSORIES
Installation plate
Installation plate fixing screw 4 × 25 mm
Remote controller holder
Fixing screw for × 3.5 × 1.6 mm (Black)
Battery (AAA) for remote controller
Wireless remote controller
Felt tape (Used for left or left-rear piping)
1
7
1
2
2
1
1
MS-GD80VB
MS-GD80VB - E1
1. New model
Use the specified 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.
Revision A:
• Another type of the electronic control P.C. board (TYPE 2) has been added to the original one (TYPE 1). They are both com-
patible with MS-GD80VB- E1 .
OBH511A

3
SPECIFICATION
3
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
Indoor-Outdoor piping length: 5 m
Indoor model
Function
Power supply
Air flow
(High/Med./Low)
Running current
Breaker capacity
Power input
Power factor
Fan motor current
Model
Dimensions W × H × D
Weight
Air direction
Sound level
(High/Med./Low)
Fan speed (High/Med./Low)
Fan speed regulator
Remote controller model
Fan Electrical
datamotor
Special remarks
Cooling
Single phase
230 V, 50 Hz
954/822/684
0.34
10
69
88
0.34
RC4V40-AA
1,100 × 325 × 258
16
5
47/42/37
1,280/1,130/970
3
KM04B
/h
A
A
W
%
A
mm
kg
dB
rpm
MS-GD80VB
NOISE CRITERIA CURVES
4
90
80
70
60
50
40
30
20
10 63 125 250 500 1000 2000 4000 8000
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
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˚C Wet-bulb temperature 19˚C
47
SPL(dB(A)) LINE
High
FAN SPEED
MS-GD80VB
INDOOR UNIT
WALL
MICROPHONE
0.8m
1m
OBH511A

OUTLINES AND DIMENSIONS
4
5
258
162
19
58
47
7.5
315
255.547
2.5
98 173
98 173414.5 414.5
5
253
791
56
1068
1100
325
Air out
Air in
Insulation ø28
Drain hose ø16
(Connected part O.D)
Installation plate
Wall hole ø75
Wireless remote controller
Installation plate Indoor unit
{
Liquid line ø 9.52- 0.5 m
Gas line ø 12-0.43 m
Insulation ø
ø
50 O.D
32 I.D
Power supply cord
Lead to right 2.0 m
Lead to left 1.0 m
MS-GD80VB Unit: mm
WIRING DIAGRAM
6
MS-GD80VB
OBH511A

5
REFRIGERANT SYSTEM DIAGRAM
7
MS-GD80VB
Indoor
heat
exchanger
Flared connection
Room temperature
thermistor
RT11
Indoor coil
thermistor
RT13(sub)
Flared connection
Refrigerant pipe ø15.88
(with heat insulator)
Refrigerant pipe ø9.52
(with heat insulator)
Indoor coil
thermistor
RT12(main)
Strainer
#50
Refrigerant flow in cooling
Unit: mm
OBH511A

6
SERVICE FUNCTIONS
8
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:
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.
(Refer to 10-6.)
The time will be shortened as follows.
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.)
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.
MS-GD80VB
J2
J1
Table 1
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
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.
NOTE: For modification, take out the bat-
teries and press the OPERATE/
STOP (ON/OFF) button 2 or 3
times at first.
After modification, put back the bat-
teries then press the RESET but-
ton.
OBH511A

7
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.
Solder jumper wire to JR07 on the indoor electronic control P.C.
board. (Refer to 10-6.)
NOTE: •The operation settings are memorized when 10 seconds have passed after the remote controller 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 appliances 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 cur-
rent by adding to the system that allows the units to start one by one.
When the indoor unit is controlled with the remote controller, the operation mode, set temperature, and the fan speed are
memorized by the indoor electronic control P.C. board. The “AUTO RESTART FUNCTION” automatically starts operation
in the same mode just before the shutoff of the main power. However if the unit is operated in “I FEEL CONTROL” mode
before power failure, the operation is not memorized. In “I FEEL CONTROL” mode, the operation is decided by the initial
room temperature.
8-3. AUTO RESTART FUNCTION
OBH511A

8
MICROPROCESSOR CONTROL
9
MS-GD80VB
ON/OFF
FAN
TOO
WARM TOO COOL
VANE
MODE
ECONO COOL
STOP
START
HR.
MIN.
WIDE VANE
LONG
I FEEL COOL
DRY
AM
RESET CLOCK
OPERATION SELECT button
FAN SPEED CONTROL button
OFF-TIMER button
HR. button
MIN. button
(TIME SET button)
ON-TIMER button
RESET button
ECONO COOL button
VANE button
(Horizontal vane button)
CLOCK SET button
LONG button
WIDE VANE button
(Vertical vane button)
FAN
ON/OFF
TOO
COOL
PM
AM
TOO
WARM
Signal transmitting section
Operation display section
OPERATE/STOP
(ON/OFF) button
TEMPERATURE buttons
WIRELESS REMOTE CONTROLLER
NOTE: • The 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.
Approximate
2 or more
Difference
between target
temperature
and room
temperature
This shows that the
air conditioner is
operating to reach
the target temperature.
Please wait until the
target temperature is
obtained.
This shows that the
room temperature is
approaching the
target temperature.
Operation stateIndication
Approximate
2 or less
OPERATION INDICATOR lamp
The OPERATION INDICATOR at the right side of the indoor
unit indicates the operation state.
INDOOR UNIT DISPLAY SECTION
The following indication applies regardless of
shape of the indicator.
Lighted
Not lighted
OBH511A

9
9-1. COOL ( ) OPERATION
(1) Press OPERATE/STOP (ON/OFF) 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 buttons.
(TOO WARM or TOO COOL button) to select the desired temperature.
The setting range is 16 ~ 31˚C
Indoor fan continues to operate regardless of thermostat's OFF-ON at set speed.
1. Coil frost prevention
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. Discharge temperature protection
The compressor is controlled by the temperature of discharge temperature thermistor RT62 for excess rise protection
of compressor discharge pressure.
9-2. DRY ( ) OPERATION
(1) Press OPERATE/STOP (ON/OFF) 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.
(4) DRY operation will not function when the room temperature is 13˚C or below.
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 Low.
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.
3. Coil frost prevention
• The operation is as same as coil frost prevention during COOL mode.
• Indoor fan operates at the set speed and the compressor stops for 5 minutes, because protection (Coil frost preven-
tion) has the priority.
However, when coil frost prevention works while the compressor is not operating, it's speed becomes Low.
9-3. FAN ( ) OPERATION
(1) Press OPERATE/STOP (ON/OFF) button.
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 dose not operate.
9-4. "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) Select "I FEEL CONTROL" mode with OPERATION SELECT button.
(3) The operation mode is determined by the room temperature at start-up of the operation.
• Once the mode is fixed, the mode dose not change by room temperature afterwards.
• Under the ON-TIMER ( ) operation, mode is determined as follows.
When the system is stopped on the remote controller, and restarted within 2 hours in " I FEEL CONTROL" ( ) mode,
the system operates in previous mode automatically regardless of the room temperature.
Mode
COOL mode of
"I FEEL CONTROL"
DRY mode of
"I FEEL CONTROL"
Initial room temperature
25 °C or more
more than 13
°C ,
less than 25
°C
OBH511A

10
(4) The initial set temperature is decided by the initial room temperature.
Model Initial room temperature Initial set temperature
COOL mode of
" I FEEL CONTROL"
26˚C or more 24˚C1
25˚C to 26˚C Initial room temperature minus 2˚C
DRY mode of
" I FEEL CONTROL" more than 13˚C, less than 25˚C Initial room temperature minus 2˚C
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) TEMPERATURE 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, consider-
ing 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.
…To raise the set temperature 1~2˚C …To lower the set temperature 1~2˚C
9-5. 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 (approximate 12 V) transmitted from indoor microprocessor.
(2) The horizontal vane angle and mode change as follows by pressing the VANE button.
OBH511A