Toshiba RAS-25S4KVPG-ND User manual

SERVICE MAN AL
Revised on Aug, 2023
Indoor Unit
RAS-25S4KVPG-ND
RAS-35S4KVPG-ND
R32
SPLIT TYPE
Outdoor Unit
RAS-25S4AVPG-ND
RAS-35S4AVPG-ND
FILE NO. SVM-23066-1

CONTENTS
1.SAFETY PRECAUTIONS .......................................................................... 3
2. SPECIFICATIONS ..................................................................................... 6
3.REFRIGERANT R32 ................................................................................. 8
4.CONSTRUCTION VIEWS ........................................................................ 16
5.WIRING DIAGRAM.................................................................................. 18
6.SPECIFICATIONS OF ELECTRICAL PARTS......................................... 19
7.REFRIGERANT CYCLE DIAGRAM ........................................................ 20
8.CONTROL BLOCK DIAGRAM................................................................ 23
9. OPERATION DESCRIPTION................................................................... 25
10.INSTALLATION PROCEDURE................................................................ 73
11.HOWTODIAGNOSETHETROUBLE...................................................... 92
12.HOWTO REPLACETHE MAIN PARTS..................................................119
13.EXPLODEDVIEWS AND PARTS LIST ................................................. 139
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For general public use
Power supply cord and connecting cable of appliance use shall be at least polychloroprene sheathed flexible
cord (design H07RN-F) or cord designation 60245 IEC66. (Shall be installed in accordance with national
wiring regulations.)
1. SAFETY PRECAUTIONS
Read the precautions in this manual
carefully before operating the unit. This appliance is fi lled with R32.
(Flammable Material)
• THIS AIR CONDITIONER ADOPTSTHE NEW HFC REFRIGERANT (R32)WHICH DOES NOT
DESTROYOZONE 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
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.
Information included in the Operation
Manual and/or Installation Manual. Service personnel should be handing this equipment
with reference to the Installation Manual.
CAUTION
New Refrigerant Air Conditioner Installation
Warning Indications on the Air Conditioner Unit
DescriptionWarning indication
CAUTION
BURST HAZARD
Open the service valves before the operation, otherwise there might be
the burst.
CAUTION
BURST HAZARD
Open the service valves
before the operation,
otherwise there might be
the burst.
• 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.
■Important information regarding the refrigerant used
This product contains fluorinated greenhouse gases.
Do not vent gases in to the atmosphere. Refrigerant type: R32
GWP(1) value: 675* (ex. R32 ref. AR4)
(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
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• ASK AN AUTHORIZED DEALER OR QUALIFIED INSTALLATION PROFESSIONALTO IN-
STALL/MAINTAINTHE 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.
DANGER
•CORRECTLY CONNECT THE CONNECTING CABLE. IF THE CONNECTING CABLE IS INCOR-
RECTLY CONNECTED, ELECTRIC PARTS MAY BE DAMAGED.
•CHECK THAT THE EARTH WIRE IS NOT BROKEN OR DISCONNECTED BEFORE SERVICE AND
INSTALLATION. FAILURE TO DO SO MAY CAUSE ELECTRIC SHOCK.
•DO NOT INSTALL NEAR CONCENTRATIONS OF COMBUSTIBLE GAS OR GAS VAPORS. 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 (MORE THAN 2 M) FROM HEAT SOURCES SUCH AS RADIATORS, HEAT
REGISTORS, FURNACE, STOVES, ETC.
•WHEN MOVING THE AIR-CONDITIONER FOR INSTALLATION IN ANOTHER PLACE, BE VERY
CARE-FUL NOT TO ALLOW THE SPECIFIED REFRIGERANT (R32) TO BECOME MIXED WITH ANY
OTHER GASEOUS BODY INTO THE REFRIGERATION CIRCUIT. IF AIR OR ANY OTHER GAS IS
MIXED IN THE 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 EVENT THAT THE REFRIGERANT GAS LEAKS OUT OF THE PIPE DURING THE SERVICE
WORK AND THE INSTALLATION WORK, IMMEDIATELY LET FRESH AIR INTO THE 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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•
•
•
•
•
For R32 model, use pipes, flare nut and tools which is specifi ed for R32 refrigerant. Using of existing (R22)
piping, flare nut and tools may cause abnormally high pressure in the refrigerant cycle (piping), and possibly
result in explosion and injury.
Thickness of copper pipes used R32 must be more than 0.8mm. Never use copper pipes thinner than 0.8mm.
Do not perform flare connection inside a building or dwelling or room, when joining the heat exchanger of
indoor unit with interconnection piping. Refrigerant connection inside a building or dwelling or room must be
made by brazing or welding. Joint connection of indoor unit by flaring method can only be made at outdoor or
at outside of building or dwelling or room. Flare connection may cause gas leak and flammable atmosphere.
After completion of installation or service, confirm there is no leakage of refrigerant gas. It may generate toxic
gas when the refrigerant contacts with fire.
Appliance and pipe-work shall be installed, operated and stored in a room with a floor area large than Amin m2
How to get Amin m2 : Amin = (M / (2.5 x 0.22759 x h0))2
M is the refrigerant charge amount in appliance in kg. h0 is the installation height of the appliance in m : 0.6 m
for floor standing/1.8m for wall mounted/1.0 m for window mounted/2.2 m for ceiling mounted.
•Comply with national gas regulations.
•Do not add any other devices without factory advice.
CAUTION
•Exposure of unit to water or other moisture before installation may result in an electrical short.
Do not store in a wet basement or expose to rain or water.
•Do not install in a place that can increase the vibration of the unit. Do not install in a place that can amplify
the noise level of the unit or where noise or discharged air might disturb neighbors.
•To avoid personal injury, be careful when handling parts with sharp edges.
•Perform the specified installation work to guard against an earthquake.
If the air conditioner is not installed appropriately, accidents may occur due to the falling unit.
•Please read this installation manual carefully before installing the unit. It contains further important
instructions for proper installation, Improper installation may cause fire, burst, electric shock, injury and
water leakage.
For Reference:
If a heating operation would be continuously performed for a long time under the condition that the outdoor
temperature is 0°C or lower, drainage of defrosted water may be difficult due to freezing of the bottom
plate, resulting in a trouble of the cabinet or fan.
It is recommended to procure an antifreeze heater locally for a safe installation of the air conditioner.
For details, contact the dealer.
WARNING
•After installation work, make sure below before operation.
- Connection pipes are connected properly and no leakage.
- Packed valves are fully open.
Running compressor without open packed valves may cause abnormal high pressure and parts failure.
Leakage at connection piping may suck air and make further high pressure cause burst and injure.
•During pump down work make sure below process.
- Don't mix air into the refrigerant cycle.
- Stop the compressor before removing piping after packed valves are fully closed.
Removing piping under the compressor running and packed valves open,
air might be sucked and refrigeration cycle pressure becomes abnormally high,
and it causes burst or injury on persons.
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