Toshiba RAS-25U2FVG-ND User manual

SERVICE MAN AL
SPLIT TYPE
Indoor Unit
<Console,Heat PumpType>
August, 2019
RAS-25U2FVG-ND
RAS-35U2FVG-ND
RAS-25U2AVPG-ND
RAS-35U2AVPG-ND
R32
FILE NO. SVM-19082

CONTENTS
1. SAFETY PRECAUTIONS .......................................................................... 3
2. SPECIFICATIONS ..................................................................................... 7
3.REFRIGERANT R32 ................................................................................. 9
4. CONSTRUCTION VIEWS ........................................................................ 17
5.WIRING DIAGRAM.................................................................................. 19
6.SPECIFICATIONS OF ELECTRICAL PARTS......................................... 21
7.REFRIGERANT CYCLE DIAGRAM ........................................................ 22
8.CONTROL BLOCK DIAGRAM................................................................ 25
9.OPERATION DESCRIPTION................................................................... 27
10.INSTALLATION PROCEDURE................................................................ 71
11.HOWTODIAGNOSETHETROUBLE...................................................... 83
12.HOWTO REPLACETHE MAIN PARTS..................................................107
13.EXPLODEDVIEWS AND PARTS LIST ................................................. 122
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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 indications]
* Property damage : Enlarged damage concerned to property, furniture, and domestic animal/pet
[Explanation of illustrated marks]
Indication Explanation
DANGER Indicates contents assumed that an imminent danger causing a death or serious injury of the
repair engineers and the third parties when an incorrect work has been executed.
WARNING Indicates possibilities assumed that a danger causing a death or serious injury of the repair
engineers, the third parties, and the users due to troubles of the product after work when an
incorrect work has been executed.
CAUTION Indicates contents assumed that an injury or property damage (*) may be caused on the repair
engineers, the third parties, and the users due to troubles of the product after work when an
incorrect work has been executed.
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.
1. SAFETY PRECAUTIONS
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For general public use
Power supply cord of outdoor unit shall be more than 1.5 mm2(H07RN-F or 60245IEC66) polychloroprene
sheathed flexible cord.
• Read this “SAFETY PRECAUTIONS” carefully before servicing.
• The precautions described below include the important items regarding safety.Observe them without fail.
• After the servicing work, perform a trial operation to check for any problem.
• Turn off the main power supply switch (or breaker) before the unit maintenance.
CAUTION
TO DISCONNECTTHE APPLIANCE FROMTHE MAIN POWER SUPPLY
This appliance must be connected to the main power supply by a circuit breaker or a switch with a contact
separation of at least 3 mm.
■Important information regarding the refrigerant used
This product contains fl uorinated greenhouse gases covered by the Kyoto Protocol. Do not vent gases into
the atmosphere. Refrigerant type: R32
GWP(1) value: 675*
(1)GWP = global warming potential
The refrigerant quantity is in dicated on the unit name plate.
*This value is based on F gas regulation 517/2014 CAUTION
Read the precautions in this manual
carefully before operating the unit. This appliance is fi lled with R32.
(Flammable Material)
Information included in the Operation
Manual and/or Installation Manual. Service personnel should be handing this equipment
with reference to the Installation Manual.
• THIS AIR CONDITIONER ADOPTS THE NEW HFC REFRIGERANT (R32) WHICH DOES NOT
DESTROY OZONE LAYER.
R32 refrigerant is apt to be affected by impurities such as water, oxidizing membrane, and oils because the
working pressure of R32 refrigerant is approx. 1.6 times of refrigerant R22. Accompanied with the adoption
of the new refrigerant, the refrigeration machine oil has also been changed. Therefore, during installation
work, be sure that water, dust, former refrigerant, or refrigeration machine oil does not enter into the new
type refrigerant R32 air conditioner circuit.
To prevent mixing of refrigerant or refrigerating machine oil, the sizes of connecting sections of charging
port on main unit and installation tools are different from those used for the conventional refrigerant units.
Accordingly, special tools are required for the new refrigerant (R32) units. For connecting pipes, use new
and clean piping materials with high pressure fittings made for R32 only, so that water and/or dust does not
enter. Moreover, do not use the existing piping because there are some problems with pressure fittings and
possible impurities in existing piping.
CAUTION
New Refrigerant Air Conditioner Installation
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• ASK AN AUTHORIZED DEALER OR QUALIFIED INSTALLATION PROFESSIONAL TO IN-
STALL/MAINTAIN THE AIR CONDITIONER.
INAPPROPRIATE SERVICING MAY RESULT IN WATER LEAKAGE, ELECTRIC SHOCK OR FIRE.
• 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.
DANGER: HIGHVOLTAGE
The high voltage circuit is incorporated.
Be careful to do the check service, as the electric shock may be caused in case of touching parts
on the P.C. board by hand.
• CORRECTLY CONNECTTHE CONNECTING CABLE. IF THE CONNECTING CABLE IS INCOR-
RECTLY CONNECTED, ELECTRIC PARTS MAY BE DAMAGED.
• CHECKTHATTHE EARTH WIRE IS NOT BROKEN OR DISCONNECTED BEFORE SERVICE AND
INSTALLATION. FAILURE TO DO SO MAY CAUSE ELECTRIC SHOCK.
DANGER
•DO NOT INSTALL NEAR CONCENTRATIONS OF COMBUSTIBLE GAS OR GASVAPORS. FAILURE
TO FOLLOW THIS INSTRUCTION CAN RESULT IN FIRE OR EXPLOSION.
•TO PREVENT THE INDOOR UNIT FROM OVERHEATING AND CAUSING A FIRE HAZARD, PLACE
THE UNIT WELL AWAY (MORETHAN 2 M) FROM HEAT SOURCES SUCH AS RADIATORS, HEAT
REGISTORS, FURNACE, STOVES, ETC.
•WHEN MOVING THE AIR-CONDITIONER FOR INSTALLATION IN ANOTHER PLACE, BEVERY CARE-
FUL NOT TO ALLOWTHE SPECIFIED REFRIGERANT (R410A)TO BECOME MIXED WITH ANY
OTHER GASEOUS BODY INTOTHE REFRIGERATION CIRCUIT. IF AIR OR ANY OTHER GAS IS
MIXED INTHE REFRIGERANT, THE GAS PRESSURE IN THE REFRIGERATION CIRCUIT WILL
BECOME ABNORMALLY HIGH AND IT MAY RESULT IN THE PIPE BURSTING AND POSSIBLE PER-
SONNEL INJURIES.
•IN THE EVENTTHATTHE REFRIGERANT GAS LEAKS OUT OFTHE PIPE DURING THE SERVICE
WORK ANDTHE INSTALLATION WORK, IMMEDIATELY LET FRESH AIR INTOTHE ROOM. IF THE
REFRIGERANT GAS IS HEATED, SUCH AS BY FIRE, GENERATION OF POISONOUS GAS MAY
RESULT.
WARNING
•Never modify this unit by removing any of the safety guards or bypassing any of the safety interlock
switches.
•Do not install in a place which cannot bear the weight of the unit. Personal injury and property damage can
result if the unit falls.
•Before doing the electrical work, attach an approved plug to the power supply cord. Also, make sure the
equipment is properly earthed.
•Appliance shall be installed in accordance with national wiring regulations. If you detect any damage, do
not install the unit. Contact your dealer immediately.
•Do not use any refrigerant different from the one specified for complement or replacement.
Otherwise, abnormally high pressure may be generated in the refrigeration cycle, which may result in a
failure or explosion of the product or an injury to your body.
•Do not use means to accelerate the defrosting process or to clean, other than those recommended by the
manufacturer.
•The appliance shall be stored in a room without continuously operating ignition sources (for example:
open flames, an operating gas appliance or an operating electric heater).
•Be aware that refrigerants may not contain an odour.
•Do not pierce or burn as the appliance is pressurized. Do not expose the appliance to heat, flame, sparks,
or other sources or ignition. Else, it may explode and cause injury or death.
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