Mitsubishi Electric MSZ-GC22VA User manual

CONTENTS
1. TECHNICAL CHANGES ····································2
2. PART NAMES AND FUNCTIONS······················2
3. SPECIFICATION·················································3
4. NOISE CRITERIA CURVES ·······························4
5. OUTLINES AND DIMENSIONS ·························5
6. WIRING DIAGRAM ············································6
7. REFRIGERANT SYSTEM DIAGRAM ················6
8. SERVICE FUNCTIONS ······································7
9. MICROPROCESSOR CONTROL ······················9
10. TROUBLESHOOTING······································14
11. DISASSEMBLY INSTRUCTIONS·····················26
MSZ-GC22VA -
MSZ-GC22VA -
MSZ-GC25VA -
MSZ-GC25VA -
MSZ-GC35VA -
MSZ-GC35VA - E2
E1
E2
E1
E2
E1
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
Outdoor unit service manual
MUZ-GC·VA Series (OBH469)
MXZ-A·VA Series (OB377)
MXZ-8A140A (OC316)
SERVICE MANUAL
Wireless type
Models
No. OBH468
REVISED EDITION-B
INDOOR UNIT
PARTS CATALOG (OBB468)
Revision B:
• has been added.
E2
Please void OBH468 REVISED EDITION-A.

2
1TECHNICAL CHANGES
MSZ-GA22VA - ➔MSZ-GC22VA -
MSZ-GA25VA - ➔MSZ-GC25VA -
MSZ-GA35VA - ➔MSZ-GC35VA - E1
E1
E1E1
E1E1
1. Indoor model has been changed.
PART NAMES AND FUNCTIONS
2
MSZ-GC22VA
MSZ-GC25VA
MSZ-GC35VA
Air outlet
Vertical vane
Air inlet
Operation Indicator
lamp
Front panel
Catechin air filter
Horizontal vane
Remote controller
Remote control
receiving section
Emergency operation switch (E.O. SW)
Air cleaning filter
(Anti-allergy enzyme filter, option)
Line flow fan
Revision A:
• 10.TROUBLESHOOTING has been corrected.
• Color of lead wire (indoor fan motor : sensor part) of 10-5.”Trouble criterion of main parts” has been corrected.
• 10-6.”ACheck of indoor fan motor” has been corrected.
Revision B:
• has been added.
E2
MSZ-GC22VA - ➔MSZ-GC22VA -
MSZ-GC25VA - ➔MSZ-GC25VA -
MSZ-GC35VA - ➔MSZ-GC35VA - E2
E1
E2E1
E2E1
1. Panel has been changed.

3
SPECIFICATION
3
Fuse
Horizontal vane motor
Varistor
Terminal block
(F11)
(MV)
(NR11)
(TB)
T3.15AL 250V
12V DC
S10K320E3K1(ERZV14D471)
3P
Specifications and rating conditions of main electric parts
NOTE : Test conditions are based on ISO 5151
Cooling : Indoor Dry-bulb temperature 27:Wet-bulb temperature 19:
Outdoor Dry-bulb temperature 35:
Heating : Indoor Dry-bulb temperature 20:
Outdoor Dry-bulb temperature 7:Wet-bulb temperature 6:
Refrigerant piping length (one way): 5m
1 Measured under rated operating frequency.
MSZ-GC25VA MSZ-GC35VA
Single phase
230V,50Hz
0.22
40
0.22
788O295O234
9
4
43
4
KM05B
36/29/22
Cooling
576
462/354/246
1,070
890/720/550
Heating
600
480/378/276
1,100
920/760/600
MSZ-GC22VA
Indoor model
Function
Power supply
36/29/21
Cooling
576
462/354/246
1,070
890/720/550
Heating
600
480/378/276
1,100
920/760/600
RC4V18-BA or CA
Cooling
552
444/330/234
1,110
930/740/580
Heating
570
462/354/246
1,140
960/780/600
Air flow(Super High)
Air flow(High/Med./Low)
Running current 1
Power input 1
Fan motor current 1
Model
Dimensions WOHOD
Weight
Air direction
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
K/h
A
W
A
mm
kg
dB(A)
dB(A)
rpm
rpm
Electrical data
Fan motor
Special remarks
Capacity
ACCESSORIES
1
2
3
4
5
6
7
Installation plate
Installation plate fixing screw 4 o25 mm
Remote controller holder
Fixing screw for 33.5 o1.6 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-GC22VA
MSZ-GC25VA
MSZ-GC35VA

4
4NOISE CRITERIA CURVES
MSZ-GC22VA
MSZ-GC25VA
INDOOR UNIT
WALL
MICROPHONE
0.8m
1m
90
80
70
60
50
40
30
20
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
Test conditions
Cooling : Dry-bulb temperature 27: Wet-bulb temperature 19:
Heating : Dry-bulb temperature 20:
43
43
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
MSZ-GC35VA
90
80
70
60
50
40
30
20
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
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
COOLING
FUNCTION SPL(dB(A)) LINE
Super High
FAN SPEED
HEATING
43
43

5
OUTLINES AND DIMENSIONS
5
Unit : mm
7459
41.5
214
235
253.5
18.5
320335
155 155
21540.5
254.5
5959 225 225
2
295
53 607 128
8
100
137
119
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
11 X26 Oblong hole 11 X20 Oblong hole
Installation plate
Indoor unit Wall hole [65
Air in
Air out
Installation plate
Piping
Drain hose
19
159
58
234 5
788
MSZ-GC22VA
MSZ-GC25VA
MSZ-GC35VA

6
6WIRING DIAGRAM
REFRIGERANT SYSTEM DIAGRAM
7
MSZ-GC22VA
MSZ-GC25VA
MSZ-GC35VA
Refrigerant flow in cooling
Refrigerant flow in heating
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)
Unit : mm
MSZ-GC22VA
MSZ-GC25VA
MSZ-GC35VA

7
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.
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.)
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
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 is turned OFF, or the power supply is 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
OPERATE/STOP(ON/OFF)
button twice or 3 times at
first.
After modification, put back
the batteries then press
the RESET button.
MSZ-GC22VA
MSZ-GC25VA
MSZ-GC35VA
J2
J1

8
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.
JR07
Indoor electronic
control P.C. board
CN10A CN111CN151 CN112
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
1If the main power has been cut, the operation settings remain.
2After 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 to JR07 on the indoor electronic control P.C. board. (Refer to 10-7.)

9
MICROPROCESSOR CONTROL
9
Once the operation mode is set, the same operation mode can be repeated by simply turning OPERATE/STOP
(ON/OFF) button ON.
Indoor unit receives the signal with a beep tone.
When the system turns off, 3-minute time delay will operate to protect system from overload and compressor will not
restart for 3 minutes.
WIRELESS REMOTE CONTROLLER
Operation Indicator lamp
The operation indicator at the right side of the indoor unit indicates the operation state.
INDOOR UNIT DISPLAY SECTION
About 2 :or more
away from
set temperature
Room temperature
About 1 to 2 :from
set temperature
The unit is operating
to reach the set
temperature
The room temperature
is approaching
the set temperature
Standby mode
(only during multi
system operation)
Operation state
Indication
Lighted
Not lighted
•The following indication applies regardless of shape of the indicator.
Blinking
MSZ-GC22VA
MSZ-GC25VA
MSZ-GC35VA
ON TIMER button
CLOCK SET button
TIME SET buttons
FORWARD button
BACKWARD button
OFF TIMER button
Open the front lid.
RESET button VANE CONTROL button
Signal transmitting section
Operation display section
Temperature buttons
OPERATE/STOP
(ON/OFF) button
FAN SPEED CONTROL button
OPERATION SELECT button
ECONO COOL button
Indication of
remote controller
model is on back

10
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.)
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.
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.
9-3. HEAT ( ) OPERATION
(1) Press OPERATE/STOP(ON/OFF) 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 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.
9-1. 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.
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.
9-4. 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 degrees
below the set temperature.
HEAT mode changes to COOL mode when about 15 minutes have passed with the room temperature 2 degrees
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”.