Mitsubishi Electric MSZ-GS30NA-U1 User manual

Models
MSZ-GS30NA -U1
MSZ-GS36NA -U1
MSY-GS30NA -U1
MSY-GS36NA -U1
SERVICE MANUAL
CONTENTS
1. TECHNICAL CHANGES································ 2
2. PART NAMES AND FUNCTIONS··················3
3. SPECIFICATION ········································4
4. OUTLINES AND DIMENSIONS ·····················6
5. WIRING DIAGRAM·····································7
6. REFRIGERANT SYSTEM DIAGRAM ·············8
7. SERVICE FUNCTIONS································9
8. MICROPROCESSOR CONTROL ················ 11
9. TROUBLESHOOTING·······························18
10. DISASSEMBLY INSTRUCTIONS·················30
No. OBH874
INDOOR UNIT
Outdoor unit service manual
MUZ-GS•NA/NAH, MUY-GS•NA Series (OBH875)
PARTS CATALOG (OBB874)

2
MSZ-GS30NA MSZ-GS36NA MSY-GS30NA MSY-GS36NA
1. New model
TECHNICAL CHANGES
1
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.
OBH874

3
Remote controller
Operation indicator
lamp
Remote control
receiving section
Emergency operation
switch
Horizontal vane
Air outlet
Air filter
(Nano platinum filter)
Air inlet
Front panel
Air cleaning filter
(Anti-Allergy Enzyme Filter)
ACCESSORIES
MSZ-GS30NA MSZ-GS36NA MSY-GS30NA MSY-GS36NA
MSZ-GS30NA
MSZ-GS36NA
MSY-GS30NA
MSY-GS36NA
(1) Installation plate 1
(2) Attacment screws for the installation plate
4 × 25 mm 7
(3) Remote controller holder 1
(4) Screws for (3) 3.5 × 1.6 mm (Black) 2
(5) Battery (AAA) for (6) 2
(6) Wireless remote controller 1
(7) Felt tape (For left or left-rear piping) 2
(8) Air cleaning lter 2
PART NAMES AND FUNCTIONS
2
OBH874

4
Model MSZ-GS30NA MSY-GS30NA MSZ-GS36NA MSY-GS36NA
Power supply V, phase, Hz 208/230 , 1 , 60
Max. fuse size (time delay)/ Disconnect switch A 15
Min. circuit ampacity A 1.0
Fan motor F.L.A 0.76
Airow
Low - Med. - High
- Super High
COOL Dry
(Wet) CFM
374 - 602 - 699 - 915
(336 - 542 - 629 - 823)
HEAT Dry 423 - 602 - 699 - 803
Moisture removal pt./h 7.8 9.3
Sound level
Low - Med. - High
- Super High
Cooling
dB(A)
32 - 42 - 49 -53
Heating *1 34 - 42 - 49 - 50 — 34 - 42 - 49 - 50 —
Cond. drain connection O.D. in. 5/8
Dimensions
W
in.
46-1/16
D 11-5/8
H 14-3/8
Weight Ib. 45
External nish Munsell 1.0Y 9.2/0.2
Remote controller Wireless type
Control voltage (by built-in transformer) 12-24 VDC
NOTE : Test conditions are based on AHRI 210/240.
*1 Only MSZ
SPECIFICATION
3
OBH874

5
3-1. OPERATING RANGE
(1) POWER SUPPLY
3-2. OUTLET AIR SPEED AND COVERAGE RANGE
(2) OPERATION
● The air coverage range is the figure up
to the position where the air speed is 1
ft./sec., when air is blown out horizon-
tally from the unit properly at the High
speed position.
The coverage range should be used
only as a general guideline since it var-
ies according to the size of the room
and furniture arranged inside the room.
Mode Condition
Intake air temperature (°F)
Indoor Outdoor
DB WB DB WB
Cooling
Standard temperature 80 67 95 —
Maximum temperature 90 73 115 —
Minimum temperature 67 57 14 —
Maximum humidity 78% —
Heating
Standard temperature 70 60 47 43
Maximum temperature 80 67 75 65
Minimum temperature 70 60 14 13
Model Mode Function Airow
(CFM)
Air speed
(ft./sec.)
Coverage
range
(ft.)
MSZ-GS30NA
MSZ-GS36NA HEAT Dry 803 22.4 42.8
MSZ-GS30NA
MSZ-GS36NA
MSY-GS30NA
MSY-GS36NA
COOL
Dry 915 25.5 48.8
Wet 823 22.9 43.9
Rated voltage Guaranteed voltage (V)
Indoor unit
208/230 V
1 phase
60 Hz
Min. 187 208 230 Max. 253
OBH874

6
Unit : inch
MSZ-GS30NA MSZ-GS36NA MSY-GS30NA MSY-GS36NA
OUTLINES AND DIMENSIONS
4
Wireless remote controller
Indoor unit
Air out
Air in
45-1/2
46-1/16
14-3/8
2-15/16 33-11/16 9-1/2
2-11/16
2-3/16 20-7/8 17-11/16
Installation plate
Piping
Drain hose
Wall hole ø3
2-5/16 3/4
14-3/8
1-7/8
4-11/16
7/811-5/81-7/8
1/8
5-3/8
5-7/8
2-5/8
2-1/2
2-15/16
4-11/16 or more 8-11/16 or more
9-3/8 or more
4-3/16 or more
3/8 or more 2-3/16 or more
In case of left,left back,
or left under piping (using spacer) 5-1/8 or more
2-13/16 or more
14-1/2 or more
Required Space (Indoor Unit)
11-5/8 1/4
OBH874

7
WIRING DIAGRAM
5
MSZ-GS30NA MSZ-GS36NA MSY-GS30NA MSY-GS36NA
OBH874

8
MSZ-GS30NA MSZ-GS36NA MSY-GS30NA MSY-GS36NA
Refrigerant flow in cooling
Refrigerant flow in heating
(Only MSZ)
Unit : inch
Indoor
heat
exchanger
Room temperature
thermistor
RT11
Refrigerant pipe ø5/8
(with heat insulator)
Flared connection
Indoor coil
thermistor
RT12 (Main)
Refrigerant pipe ø1/4
(with heat insulator)
Distributor
Indoor coil
thermistor
RT13 (Sub)
Flared connection
REFRIGERANT SYSTEM DIAGRAM
6
OBH874

9
7-2. 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.
7-1. TIMER SHORT MODE
For service, set time can be shortened by short circuit of JPG and JPS the indoor 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.)
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.
How to modify the remote controller P.C. board
Remove batteries before modification.
The board has a print as shown below :
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.
NOTE : For modification, take out
the batteries and press the
OFF/ON (stop/operate)
button twice or 3 times at
first.
After finish modification,
put back the batteries then
press the RESET button.
J2
J1
MSZ-GS30NA MSZ-GS36NA MSY-GS30NA MSY-GS36NA
Table 1
1 unit operation 2 units operation 3 units operation 4 units operation
No. 1 unit No modication Same as at left Same as at left Same as at left
No. 2 unit — Solder J1 Same as at left Same as at left
No. 3 unit — — Solder J2 Same as at left
No. 4 unit — — — Solder both J1 and J2
SERVICE FUNCTIONS
7
OBH874

10
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 turned 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 the breaker from tripping 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.
JR77
CN151
CN112
CN111
Indoor electronic
control P.C. board
7-3. 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.)
OBH874