Toshiba RAS-5M51U2ACVG-SG User manual

SERVICE MANUAL
AIR-CONDITIONER
SPLIT TYPE
RAS-5M51U2ACVG-SG
Revised on June, 2020
R32
FILE NO. SVM-20009-1

CONTENTS
1. SAFETY PRECAUTIONS ............................................................3
2. SPECIFICATIONS .......................................................................10
3. REFRIGERANT R32 .................................................................. 18
4. CONSTRUCTIONVIEWS .......................................................... 26
5. WIRING DIAGRAM .................................................................... 27
6. SPECIFICATIONS OF ELECTRICAL PARTS........................... 28
7. REFRIGERANT CYCLE DIAGRAM........................................... 29
8. CONTROL BLOCK DIAGRAM .................................................. 31
9. OPERATION DESCRIPTION ..................................................... 32
10. INSTALLATION PROCEDURE .................................................. 48
11. HOWTO DIAGNOSETHETROUBLE ........................................ 60
12. HOWTOREPLACETHE MAIN PARTS ..................................... 84
13. EXPLODEDVIEWS AND PARTS LIST.......................................98
- 2 -

Warning indications on the air conditioner unit
WARNING
(Risk of fire
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 flammabl
refrigerant.
If refrigerant leaks and comes in contact with fire or heating part
it will create harmful gas and there is risk of fire
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 effects and requires hospitalization or extende
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 affects 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.
- 3 -

For general public use
Power supply cord of parts of appliance for outdoor use shall be at least polychloroprene
sheathed flexible cord (design H07RN-F) or cord designation 602 5 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.
- 4 -

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.
- 5 -

WARNING
About the refrigerant
• This product contains fluorinated greenhouse gases
• Do not vent gases to the atmosphere.
• The appliance shall be stored in a room without continuously operating ignition sources
(for example: open flames, an operating gas ppliance or an operating electric heater).
• Do not pierce or burn refrigerant cycle parts.
• Do not use means to accelerate the defrosting process or to clean, other than those
recommended by the manufacturer.
• Be aware that refrigerants may not contain an odour.
• The refrigerant inside the unit is flammable. If he refrigerant leaks in the room and comes
in contact with fire from a burne , a heater, or a cooker, it may result in fire or the formatio
of a harmful gas.
• Turn off any combustible heating devices, ventilate the room, and contact the dealer fro
which you purchased the unit.
• Do not use the unit until a service person confirms that the portion from which th
refrigerant leaked is repaired.
• When installing, relocating, or servicing the air conditioner, use only the specifie
refrigerant (R32) to charge the refrigerant lines. Do not mix it with any other refrigerant
and do not allow air to remain in the lines.
• Pipe-work shall be protected from physical damage.
• Compliance with national gas regulations shall be observed.
• Do not use any refrigerant different from the one specified for complement or replacemen
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.
• Installation work must be requested from the supplying retail dealership or professional
vendors. Self-installation may cause water leakage, electrical shock, or fire as a result o
improper installation.
• Specified tools and pipe parts for model R32 are required, and installation work mus
be done in accordance with the manual. HFC type refrigerant R32 has 1.6 Times more
pressure than that of conventional refrigerant (R22). Use the specified pipe parts, an
ensure correct installation, otherwise damage and/or injury may be caused. At the same
time, water leakage, electrical shock, and fire may occu .
• Be sure to install the unit in a place which can sufficiently bear its weight. If the lo
bearing of the unit is not enough, or installation of the unit is improper, the unit may fall
and result in injury.
• Electrical work must be performed by a qualified electrical engineer in accordance wit
the code governing such installation work, internal wiring regulations, and the manual.
A dedicated circuit and the rated voltage must be used. Insufficient power supply
improper installation may cause electrical shock or fire
• Use a cabtyre cable to connect wires in the indoor/outdoor units. Midway connection,
stranded wire, and single-wire connections are not allowed. Improper connection or fixin
may cause a fire
- 6 -

WARNING
• Wiring between the indoor unit and outdoor units must be well shaped so that the cover
can be fir ly placed. Improper cover installation may cause increased heat, fire, o
electrical shock at the terminal area.
• Be sure to use only approved accessories or the specified parts. Failure to do so ma
cause the unit to fall, water leakage, fire or el ctrical shock.
• After the installation work, ensure that there is no leakage of refrigerant gas. If the
refrigerant gas leaks out of the pipe into the room and is heated by fire or something els
from a fan heater, stove or gas range, it causes generation of poisonous gas.
• Make sure the equipment is properly earthed. Do not connect the earth wire to a gas pipe,
water pipe, lightning conductor, or telephone earth wire. Improper earth work may be the
cause of electrical shock.
• Do not install the unit where flammable gas may leak. If there is any gas leakage o
accumulation around the unit, it can cause a fire
• Do not select a location for installation where there may be excessive water or humidity,
such as a bathroom. Deterioration of insulation may cause electrical shock or fire
• Installation work must be performed following the instructions in this installation manual.
Improper installation may cause water leakage, electrical shock or fire. Check th
following items before operating the unit.
- Be sure that the pipe connection is well placed and there are no leaks.
- Check that the service valve is open. If the service valve is closed, it may cause
overpressure and result in compressor damage. At the same time, if there is a leak in
the connection part, it may cause air suction and overpressure, resulting in burst or
injury.
• The installation of pipe work shall be kept to a minimum.
• The following must be certainly done during pump down.
• Do not incorporate air into the refrigeration cycle.
• Close the 2 service valves. Stop the compressor and remove the refrigerant pipe.
If the refrigerant pipe is removed when the compressor is operating and service valves are
opened, the refrigerant cycle will inhale unwanted matter such as air and the pressure in
the cycle becomes abnormally elevated. It may cause a burst or injury.
- 7 -

WARNING
• Do not modify the power cable, connect the cable midway, or use a multiple outlet
extension cable. Doing so may cause contact failure, insulation failure, or excess current,
resulting in fire or electrical shock
• If you detect any damage, do not install the unit. Contact your supplying dealer
immediately.
• Never modify this unit by removing any of the safety guards or bypassing any of the safety
interlock switches.
• Do not wash air conditioners with pressure washers.
Electric leaks may cause electric shocks or fir s.
• Be sure to comply with local regulations/codes when running the wire from the outdoor
unit to the indoor unit. (Size of wire and wiring method etc.)
• When installing the air conditioner in a small room, provide appropriate measures to
ensure that the concentration of refrigerant leakage occur in the room does not exceed
the critical level. It is not dangerous refrigerant; it has not toxicity.
However, a concentration above 0.3 kg/m³ as criterion still causes suffocation. The volume
of refrigerant charged to the multi system air conditioner is more than the volume charged
to a conventional individual system.
• Minimum floor area for installation the Multi System air conditione , When combined with
the indoor product, shall be installed in a room with a floor area follow as below table
Refrigerant amount (kg) Minimumoorarea,Whencombinedwithindoorproduct.(m2)
HIGH-WALL
≤ 1.84 -
1.92 4
2.12 4
2.32 5
2.39 5
2.52 6
2.72 7
2.92 8
3.19 10
• Before operating the air conditioner after having completed the work, check that the
electrical parts control box cover of the indoor unit and valve cover of the outdoor unit are
closed, and set the circuit breaker to the ON position. You may receive an electric shock
etc. if the power is turned on without first cond cting these checks.
• Make sure drain hose insulation if cooling operation is used at sub-zero ambient
temperature.
- 8 -

CAUTION
• Please read this installation manual carefully before installing the unit. It contains further
important instructions for proper installation.
• Exposure of unit to water or other moisture before installation could result in electric
shock. Do not store it in a wet basement or expose to rain or water.
• After unpacking the unit, examine it carefully for possible damage.
• 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 and discharged air might disturb
neighbours.
• This appliance must be connected to the main power supply by means of a circuit breaker
depending on the place where the unit is installed. Failure to do so may cause electrical
shock.
• Follow the instructions in this installation manual to arrange the drain pipe for proper
drainage from the unit. Ensure that drained water is discharged. Improper drainage can
result in water leakage, causing water damage to furniture.
• Tighten the flare nut with a torque wrench using the prescribed method. Do not appl
excess torque. Otherwise, the nut may crack after a long period of usage and it may
cause the leakage of refrigerant.
• Wear gloves (heavy gloves such as cotton gloves) for installation work. Failure to do so
may cause personal injury when handling parts with sharp edges.
• Do not touch the air intake section or the aluminium fins of the outdoor unit. It may caus
injury.
• Do not install the outdoor unit in a place which can be a nest for small animals. Small
animals could enter and contact internal electrical parts, causing a failure or fire
• Request the user to keep the place around the unit tidy and clean.
• Make sure to conduct a test run after the installation work, and explain how to use and
maintain the unit to the customer in accordance with the manual. Ask the customer to
keep the operation manual along with the installation manual.
• Do not climb onto or place objects on top of the outdoor unit. You may fall or the objects
may fall off of the outdoor unit and result in injur .
Requirement of report to the local power supplier
Please make absolutely sure that the installation of this appliance is reported to the local
power supplier before installation. If you experience any problems or if the installation is not
accepted by the supplier, the service agency will take adequate countermeasures.
Important information regarding the refrigerant used
This product contains fluorinated greenhouse gases
Do not vent gases into the atmosphere.
Refrigerant type: R32
GWP(1) value: 675 * (ex. R32 ref. AR4)
(1)GWP = global warming potential
The refrigerant quantity is indicated on the unit name plate.
* This value is based on F gas regulation 517/2014
- 9 -

2. SPECIFICATIONS
The indoor and outdoor units that can be used in combination are shown in the tables below.
NOTES
A 1-room connection is not an option for the indoor units (you cannot connect only one indoor unit).
Be sure to connect indoor units in two or more.
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.
Table of models that can be used in combination
Type Outdoor unitCombinations of indoor unit models that can be connected
Refer to page 11 to 16
2-1. Specifications
<Cooling Only Models>
RAS-5M51U2ACVG-SG
Cooling RAS-5M51U2ACVG-SG
Unit models Outdoor units RAS-5M51U2ACVG-SG
Indoor unit connecting of below performance spec. RAS-M10U2KCVG-SG1 x5
Cooing capacity (rated) (kW) 8.30
Cooling capacity (range) (kW) 3.70 - 11.5
COP - 4.90
Power supply 220-240V., 50Hz. Electrical
characteristics Power consumption (W) 1695
Running current (A) 8.20/7.85/7.55
Power factor (%) 94
Starting current (A) 8.20
Outdoor unit operating noise Sound pressure level (dBA) 53
Sound power level (dBA) 66
Compressor Model - DX270A2T-20L Characteristic
and component parts spec. Type - Twin rotary with DC-inverter variable speed control
Output (W) 2200
Fan motor Model - WDF-340-A100-1
Type - DC motor with variable speed control circuit
Output (W) 100W
Airflow rate (m3/h) .4460
Refrigerant Type - R32
Weight charging (kg.) 2.35
Unit dimension Height (mm.) 890
Width (mm.) 900
Depth (mm.) 320
Net weight (kg.) 74
Piping connection Connecting method - Flare connection
Diameter Unit A (liquid / gas side) (mm.) 6.35 / 12.7
Unit B (liquid / gas side) (mm.) 6.35 / 12.7
Unit C (liquid / gas side) (mm.) 6.35 / 9.52
Unit D (liquid / gas side) (mm.) 6.35 / 9.52
Unit E (liquid / gas side) (mm.) 6.35 / 9.52
Maximum length (each unit) (mm.) 20
Maximum length (total) (mm.) 30
Maximum length (chargless) (mm.) 30
Maximum height different (mm.) 10
Wiring connection Main power supply - 3wires included earth
Inter connection (each room) - 4wires included earth
Usable temperature range (outside) (oC) .10 - 46 OC .
Outdoor unit accessory - -
·Performance specification with others Indoor unit combine are refer to combination table.
·The specifications may be subject to change without notice for purpose of improvement.
- 10 -