Toshiba RAS-2M21U2ACVG-SG User manual

SERVICE MANUAL
AIR-CONDITIONER
MULTI TYPE
RAS-2M21U2ACVG-SG
RAS-3M31U2ACVG-SG
RAS-3M41U2ACVG-SG
December 2019
R32
FILE NO. SVM-19118

CONTENTS
1. SAFETY PRECAUTIONS ............................................................ 3
2. SPECIFICATIONS ...................................................................... 10
3. REFRIGERANT R32 .................................................................. 16
4. CONSTRUCTION VIEWS .......................................................... 24
5. WIRING DIAGRAM .................................................................... 25
6. SPECIFICATIONS OF ELECTRICAL PARTS............................ 27
7. REFRIGERANT CYCLE DIAGRAM........................................... 28
8. CONTROL BLOCK DIAGRAM .................................................. 32
9. OPERATION DESCRIPTION ..................................................... 34
10. INSTALLATION PROCEDURE .................................................. 48
11. HOW TO DIAGNOSE THE TROUBLE ........................................ 57
12. HOW TO REPLACE THE MAIN PARTS ..................................... 79
13. EXPLODED VIEWS AND PARTS LIST....................................... 88
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Warning indications on the air conditioner unit
WARNING
(Risk of re)
This mark is for R32 refrigerant only. Refrigerant type is written
on nameplate of outdoor unit.
In case that refrigerant type is R32, this unit uses a ammable
refrigerant.
If refrigerant leaks and comes in contact with re or heating part,
it will create harmful gas and there is risk of re.
Read the OWNER’S MANUAL carefully before operation.
Service personnel are required to carefully read the OWNER’S MANUAL and
INSTALLATION MANUAL before operation.
Further information is available in the OWNER’S MANUAL, INSTALLATION
MANUAL, and the like.
Be sure to follow the precautions provided here to avoid safety risks. The symbols and their
meanings are shown below.
DANGER It indicates that incorrect use of this unit can result in a high possibility of
severe injury(*1) or death.
WARNING It indicates that incorrect use of this unit may cause severe injury or
death.
CAUTION It indicates that incorrect use of this unit may cause personal injury(*2),
or property damage(*3).
*1: A severe injury refers to blindness, injury, burns (hot or cold), electrical shock, bone
fracture, or poisoning that leaves after e󰀨ects and requires hospitalization or extended
out-patient treatment.
*2: Personal injury means a slight accident, burn, or electrical shock which does not
require admission or repeated hospital treatment.
*3: Property damage means greater damage which a󰀨ects assets or resources.
1. SAFETY PRECAUTIONS
The important contents concerned to the safety are described on the product itself and on this Service
Manual. Please read this Service Manual after understanding the described items thoroughly in the
following contents (Indications/Illustrated marks), and keep them.
[Explanation of illustrated marks]
Mark Explanation
Indicates prohibited items (Forbidden items to do)
The sentences near an illustrated mark describe the concrete prohibited contents.
Indicates mandatory items (Compulsory items to do)
The sentences near an illustrated mark describe the concrete mandatory contents.
Indicates cautions (including danger/warning)
The sentences or illustration near or in an illustrated mark describe the concrete cautious contents.
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For general public use
Power supply cord of parts of appliance for outdoor use shall be at least polychloroprene
sheathed exible cord (design H07RN-F) or cord designation 60245 IEC66 (1.5 mm² or more).
(Shall be installed in accordance with national wiring regulations.)
This appliance is not intended for use by person (including children) with reduced physical,
sensory or mental capabilities, or lack of experience and knowledge, unless they have been
given supervision or instruction concerning use of the appliance by a person responsible for
their safety.
Children should be supervised to ensure that they do not play with the appliance.
CAUTION
To disconnect the appliance from the main power supply
This appliance must be connected to the main power supply by means of a circuit breaker or
a switch with a contact separation of at least 3 mm in all poles.
CAUTION
NEW REFRIGERANT AIR CONDITIONER INSTALLATION
THIS AIR CONDITIONER USES THE NEW HFC REFRIGERANT (R32), WHICH DOES
NOT DESTROY THE OZONE LAYER.
R32 REFRIGERANT IS APT TO BE AFFECTED BY IMPURITIES SUCH AS WATER,
OXIDIZING MEMBRANES, AND OILS BECAUSE THE PRESSURE OF R32
REFRIGERANT IS APPROX. 1.6 TIMES OF REFRIGERANT R22.
AS WELL AS THE ADOPTION OF THIS NEW REFRIGERANT, REFRIGERATING
MACHINE OIL HAS ALSO BEEN CHANGED. THEREFORE, DURING INSTALLATION
WORK, BE SURE THAT WATER, DUST, FORMER REFRIGERANT, OR REFRIGERATING
MACHINE OIL DOES NOT ENTER THE REFRIGERATION CYCLE OF A NEW-
REFRIGERANT AIR CONDITIONER. TO AVOID MIXING REFRIGERANT AND
REFRIGERATING MACHINE OIL, THE SIZES OF CHARGING PORT CONNECTING
SECTIONS ON THE MAIN UNIT ARE DIFFERENT FROM THOSE FOR THE
CONVENTIONAL REFRIGERANT, AND DIFFERENT SIZE TOOLS ARE ALSO REQUIRED.
FOR CONNECTING PIPES, USE NEW AND CLEAN PIPING MATERIALS WITH HIGH
PRESSURE WITHSTAND CAPABILITIES, DESIGNED FOR R32 ONLY, AND ENSURE
THAT WATER OR DUST DOES NOT ENTER. MOREOVER, DO NOT USE ANY EXISTING
PIPING AS ITS PRESSURE WITHSTAND MAY BE INSUFFICIENT AND MAY CONTAIN
IMPURITIES.
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DANGER
• THE MANUFACTURER SHALL NOT ASSUME ANY LIABILITY FOR THE DAMAGE
CAUSED BY NOT OBSERVING THE DESCRIPTION OF THIS MANUAL.
• FOR USE BY QUALIFIED PERSONS ONLY.
• MEANS FOR DISCONNECTION FROM THE SUPPLY HAVING A CONTACT
SEPARATION OF AT LEAST 3 MM IN ALL POLES MUST BE INCORPORATED IN THE
FIXED WIRING.
• TURN OFF MAIN POWER SUPPLY BEFORE ATTEMPTING ANY ELECTRICAL WORK.
MAKE SURE ALL POWER SWITCHES ARE OFF. FAILURE TO DO SO MAY CAUSE
ELECTRIC SHOCK.
• CONNECT THE CONNECTING CABLES CORRECTLY. IF THE CONNECTING CABLES
ARE CONNECTED WRONGLY, ELECTRIC PARTS MAY BE DAMAGED.
• CHECK THE EARTH WIRE THAT IT IS NOT BROKEN OR DISCONNECTED BEFORE
INSTALLATION.
• DO NOT INSTALL NEAR CONCENTRATIONS OF COMBUSTIBLE GAS OR GAS
VAPORS. FAILURE TO FOLLOW THIS INSTRUCTION CAN RESULT IN FIRE OR
EXPLOSION.
• TO PREVENT OVERHEATING THE INDOOR UNIT AND CAUSING A FIRE HAZARD,
PLACE THE UNIT WELL AWAY (MORE THAN 2 M) FROM HEAT SOURCES SUCH AS
RADIATORS, HEATERS, FURNACE, STOVES, ETC.
• WHEN MOVING THE AIR CONDITIONER FOR INSTALLING IT IN ANOTHER PLACE
AGAIN, BE VERY CAREFUL NOT TO GET THE SPECIFIED REFRIGERANT (R32)
WITH ANY OTHER GASEOUS BODY INTO THE REFRIGERATION CYCLE. IF AIR OR
ANY OTHER GAS IS MIXED IN THE REFRIGERANT, THE GAS PRESSURE IN THE
REFRIGERATION CYCLE BECOMES ABNORMALLY HIGH AND IT RESULTANTLY
CAUSES BURST OF THE PIPE AND INJURIES ON PERSONS.
• IN THE EVENT THAT THE REFRIGERANT GAS LEAKS OUT OF THE PIPE DURING
THE INSTALLATION WORK, IMMEDIATELY LET FRESH AIR INTO THE ROOM. IF
THE REFRIGERANT GAS IS HEATED BY FIRE OR SOMETHING ELSE, IT CAUSES
GENERATION OF POISONOUS GAS.
• WHEN INSTALLING OR RE-INSTALLING THE AIR CONDITIONER, DO NOT INJECT
AIR OR OTHER SUBSTANCES BESIDES THE DESIGNATED REFRIGERANT “R32”
INTO THE REFRIGERATING CYCLE.
IF AIR OR OTHER SUBSTANCES ARE MIXED, AN ABNORMAL PRESSURE CAN
OCCUR IN THE REFRIGERATING CYCLE, AND THIS CAN CAUSE AN INJURY DUE
TO A PIPE RUPTURE.
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