TOSHIBA RAV-GM901ATP-E Air Conditioner Split Type Instruction Manual

AIR CONDITIONER (SPLIT TYPE)
Installation Manual
Outdoor Unit
Model name:
RAV-GM901ATP-E
RAV-GM901ATJP-E

ADOPTION OF R32 REFRIGERANT

This air conditioner adopts the HFC refrigerant (R32) which does not destroy the ozone layer.
This outdoor unit is designed exclusively for use with R32 refrigerant. Be sure to use in combination with a R32 refrigerant indoor unit.
This equipment complies with IEC 61000-3-12 provided that the short-circuit power Ssc is greater than or equal to Ssc (1) at the interface point between the user’s supply and the public system. It is the responsibility of the installer or  user of the equipment to ensure, by consultation with the distribution network operator if necessary, that the equipment is connected only to a supply with a short-circuit power Ssc greater than or equal to Ssc (1).
Ssc (*1)

Thank you for purchasing this Toshiba air conditioner.
Please read carefully through these instructions that contain important information which complies with the Machinery Directive (Directive 2006/42/EC), and ensure that you understand them.
After reading these instructions, be sure to keep them in a safe place together with the Owner’s Manual and Installation Manual supplied with your product.

Generic Denomination: Air Conditioner

Definition of Qualified Installer or Qualified Service Person
The air conditioner must be installed, maintained, repaired and removed by a qualified installer or qualified service person. When any of these jobs is to be done, ask a qualified installer or qualified service person to do them for you.
A qualified installer or qualified service person is an agent who has the qualifications and knowledge described in the table below.

maintains, relocates and removes the air conditioners made by Toshiba Carrier Corporation. He or she has been trained to install, maintain, relocate and remove the air conditioners made by Toshiba Carrier  Corporation or, alternatively, he or she has been instructed in such operations by an individual or individuals who have been  trained and is thus thoroughly acquainted with the knowledge related to these operations.
The qualified installer who is allowed to do the electrical work involved in installation, relocation and removal has the  qualifications pertaining to this electrical work as stipulated by the local laws and regulations, and he or she is a person who has been trained in matters relating to electrical work on the air conditioners made by Toshiba Carrier Corporation or, alternatively, he or she has been instructed in such matters by an individual or individuals who have been trained and is thus  thoroughly acquainted with the knowledge related to this work.
The qualified installer who is allowed to do the refrigerant handling and piping work involved in installation, relocation and  removal has the qualifications pertaining to this refrigerant handling and piping work as stipulated by the local laws and  regulations, and he or she is a person who has been trained in matters relating to refrigerant handling and piping work on the  air conditioners made by Toshiba Carrier Corporation or, alternatively, he or she has been instructed in such matters by an  individual or individuals who have been trained and is thus thoroughly acquainted with the knowledge related to this work.
The qualified installer who is allowed to work at heights has been trained in matters relating to working at heights with the air  conditioners made by Toshiba Carrier Corporation or, alternatively, he or she has been instructed in such matters by an  individual or individuals who have been trained and is thus thoroughly acquainted with the knowledge related to this work.
Qualified service
person|  The qualified service person is a person who installs, repairs, maintains, relocates and removes the air conditioners made by  Toshiba Carrier Corporation. He or she has been trained to install, repair, maintain, relocate and remove the air conditioners  made by Toshiba Carrier Corporation or, alternatively, he or she has been instructed in such operations by an individual or  individuals who have been trained and is thus thoroughly acquainted with the knowledge related to these operations.
The qualified service person who is allowed to do the electrical work involved in installation, repair, relocation and removal has  the qualifications pertaining to this electrical work as stipulated by the local laws and regulations, and he or she is a person  who has been trained in matters relating to electrical work on the air conditioners made by Toshiba Carrier Corporation  or, alternatively, he or she has been instructed in such matters by an individual or individuals who have been  trained and is thus thoroughly acquainted with the knowledge related to this work.
The qualified service person who is allowed to do the refrigerant handling and piping work involved in installation, repair,  relocation and removal has the qualifications pertaining to this refrigerant handling and piping work as stipulated by the local  laws and regulations, and he or she is a person who has been trained in matters relating to refrigerant handling and piping  work on the air conditioners made by Toshiba Carrier Corporation or, alternatively, he or she has been instructed in such  matters by an individual or individuals who have been trained and is thus thoroughly acquainted with the knowledge related to  this work.
The qualified service person who is allowed to work at heights has been trained in matters relating to working at  heights with the air conditioners made by Toshiba Carrier Corporation or, alternatively, he or she has been instructed in such  matters by an individual or individuals who have been trained and is thus thoroughly acquainted with the knowledge related to this work.

Definition of Protective Gear
When the air conditioner is to be transported, installed, maintained, repaired or removed, wear protective gloves and “Safety” work clothing.
In addition to such normal protective gear, wear the protective gear described below when undertaking the special work detailed in the table below.
Failure to wear the proper protective gear is dangerous because you will be more susceptible to injury, burns, electric shocks and other injuries.

Insulating shoes
Clothing to provide protection from electric shock
Work done at heights (50 cm or more)| Helmets for use in industry
Transportation of heavy objects| Shoes with additional protective toe cap
Repair of outdoor unit| Gloves to provide protection for electricians

Center of gravity

These safety cautions describe important matters concerning safety to prevent injury to users or other people and damages to property. Please read through this manual after understanding the contents below (meanings of indications), and be sure to follow the description.

directions in the warning could result in serious bodily harm  (1) or loss of life if the product is handled improperly.
CAUTION| Text set off in this manner indicates that failure to adhere to the directions in the caution could result in slight injury (2) or  damage (*3) to property if the product is handled improperly.

1: Serious bodily harm indicates loss of eyesight, injury, burns, electric shock, bone fracture, poisoning, and other injuries which leave aftereffect and require hospitalization or long-term treatment as an outpatient.
2: Slight injury indicates injury, burns, electric shock, and other injuries which do not require hospitalization or long-term treatment as an outpatient.
*3: Damage to property indicates damage extending to buildings, household effects, domestic livestock, and pets.

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 flammable 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.

Precautions for safety

The manufacturer shall not assume any liability for the damage caused by not observing the description of this manual.
WARNING
General

• Before starting to install the air conditioner, read carefully through the Installation Manual, and follow its instructions to install the air conditioner.
• Only a qualifi ed installer(1) or qualifi ed service person(1) is allowed to install the air conditioner. If the air conditioner is installed by an unqualifi ed individual, a fi re, electric shocks, injury, water leakage, noise and/or vibration may  result.
• 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.
• When transporting the air conditioner, use a forklift and when moving the air conditioner by hand, move the unit with 2 people.
• Before opening the intake grille of the indoor unit or valve cover of the outdoor unit, set the circuit breaker to the OFF position.
• Failure to set the circuit breaker to the OFF position may result in electric shocks through contact with the interior parts. Only a qualifi ed installer(1) or qualifi ed service person(1) is allowed to remove the intake grille of the indoor unit or valve cover of the outdoor unit and do the work required.
• Before carrying out the installation, maintenance, repair or removal work, be sure to set the circuit breaker to the OFF position. Otherwise, electric shocks may result.
• Place a “Work in progress” sign near the circuit breaker while the installation, maintenance, repair or removal work is being carried out. There is a danger of electric shocks if the circuit breaker is set to ON by mistake.
• Only a qualifi ed installer(1) or qualifi ed service person(1) is allowed to undertake work at heights using a stand of 50 cm or more.
• Wear protective gloves and safety work clothing during installation, servicing and removal.
• Do not touch the aluminum fi n of the outdoor unit. You may injure yourself if you do so. If the fi n must be touched for some reason, fi rst put on protective gloves and safety work clothing, and then proceed.
• 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 injury.
• When working at heights, use a ladder which complies with the ISO 14122 standard, and follow the procedure in the ladder’s instructions. Also wear a helmet for use in industry as protective gear to undertake the work.
• When cleaning the fi lter or other parts of the outdoor unit, set the circuit breaker to OFF without fail, and place a “Work in progress” sign near the circuit breaker before proceeding with the work.
• When working at heights, put a sign in place so that no-one will approach the work location, before proceeding with the work. Parts and other objects may fall from above, possibly injuring a person below.
• You shall ensure that the air conditioner is transported in stable condition. If any part of the product is broken, contact the dealer.
• Do not modify the products. Do not also disassemble or modify the parts. It may cause a fi re, electric shock or injury.
• This appliance is intended to be used by expert or trained users in shops, in light industry, or for commercial use by lay persons.
• Do not add any other devices without factory advice.

About the refrigerant

• This product contains uorinated 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 Ames, an operating gas appliance 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 ammable. If the refrigerant leaks in the room and comes in contact with re from a burner, a heater, or a cooker, it may result in re or the formation of a harmful gas.
• Turn off any combustible heating devices, ventilate the room, and contact the dealer from which you purchased the unit.
• Do not use the unit until a service person con rms that the portion from which the refrigerant leaked is repaired.
• When installing, relocating, or servicing the air conditioner, use only the speci ed 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.

Selection of installation location

• If you install the unit in a small room, take appropriate measures to prevent the refrigerant from exceeding the limit concentration even if it leaks. Consult the dealer from whom you purchased the air conditioner when you  implement the measures. Accumulation of highly concentrated refrigerant may cause an oxygen de ciency accident.
• Do not install the air conditioner in a location that may be subject to a risk of expire to a combustible gas. If a combustible gas leaks and becomes concentrated around the unit, a re may occur.
• When transporting the air conditioner, wear shoes with additional protective toe caps.
• When transporting the air conditioner, do not take hold of the bands around the packing carton. You may injure yourself if the bands should break.
• Do not place any combustion appliance in a place where it is directly exposed to the wind of air conditioner, otherwise it may cause imperfect combustion.
• Do not install the air conditioner in a poorly ventilated space that is smaller than the minimum oor area (Amin).
  This applies to:
  • Indoor units
  • Outdoor units installed (example: winter garden, garage, machinery room, etc)
  Refer to “15 Appendix – [2] Minimum oor area: Amin (m 2 )” to determine the minimum oor area.

Installation

• Install the air conditioner at enough strong places to withstand the weight of the unit. If the strength is not enough, the unit may fall down resulting in injury.

• Follow the instructions in the Installation Manual to install the air conditioner. Failure to follow these instructions may cause the product to fall down or topple over or give rise to noise, vibration, water leakage, etc.

• The designated bolts (M10) and nuts (M10) for securing the outdoor unit must be used when installing the unit.

• Install the outdoor unit property in a location that is durable enough to support the weight of the outdoor unit.
  Insufcient durability may cause the outdoor unit to fall, which may result in injury.

• If refrigerant gas has leaked during the installation work, ventilate the room immediately. If the leaked refrigerant gas comes in contact with re, noxious gas may be generated.

• The installation of pipe work shall be kept to a minimum.

Refrigerant piping

• Install the refrigerant pipe securely during the installation work before operating the air conditioner. If the compressor is operated with the valve open and without refrigerant pipe, the compressor sucks air and the refrigeration  cycles is over pressurized, which may cause a injury.
• Tighten the are nut with a torque wrench in the specie manner. Excessive tighten of the are nut may cause a crack in the are nut after a long period, which may result in refrigerant leakage.
• For installation and relocation work, follow the instructions in the Installation Manual and use tools and pipe components specically made for use with R32 refrigerant. If pipe components not designed for R32 refrigerant are used  and the unit is not installed correctly, the pipes may burst and cause damage or injuries. In addition, water leakage, electric shock, or re may result.
• Nitrogen gas must be used for the airtight test.
• The charge hose must be connected in such a way that it is not slack.

Electrical wiring

• Only a qualied installer(1) or qualied service person(1) is allowed to carry out the electrical work of the air conditioner.
  Under no circumstances must this work be done by an unqualied individual since failure to carry out the work properly may result in electric shocks and/or electrical leaks.

• The appliance shall be installed in accordance with national wiring regulations. Capacity shortages of the power circuit or an incomplete installation may cause an electric shock or re.

• Use wiring that meets the specications in the Installation Manual and the stipulations in the local regulations and laws.
  Use of wiring which does not meet the speccations may give rise to electric shocks, electrical leakage, smoking and/or a re.

• Be sure to connect earth wire. (Grounding work)
  Incomplete grounding causes an electric shock.

• Do not connect ground wires to gas pipes, water pipes, and lightning rods or ground wires for telephone wires.

• After completing the repair or relocation work, check that the ground wires are connected properly.

• Install a circuit breaker that meets the speciation’s in the installation manual and the stipulations in the local regulations and laws.

• Install the circuit breaker where it can be easily accessed by the agent.

• When installing the circuit breaker outdoors, install one which is designed to be used outdoors.

• Under no circumstances must the power cable be extended.
  Connection trouble in the places where the cable is extended may give rise to smoking and/or a Fire.

Test run

• 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 rst conducting these checks.

• When you have noticed that some kind of trouble (such as when an error display has appeared, there is a smell of burning, abnormal sounds are heard, the air conditioner fails to cool or heat or water is leaking) has occurred in the  air conditioner, do not touch the air conditioner yourself but set the circuit breaker to the OFF position, and contact a qualied service person.
  Take steps to ensure that the power will not be turned on (by marking “out of service” near the circuit breaker, for instance) until qualied service person arrives. Continuing to use the air conditioner in the trouble status may cause mechanical problems to escalate or result in electric shocks, etc.

• After the work has nished, be sure to use an insulation tester set (500V Megger) to check the resistance is 1M or more between the charge section and the non-charge metal section (Earth section). If the resistance value is low, a  disaster such as a leak or electric shock is caused at user’s side.

• Upon completion of the installation work, check for refrigerant leaks and check the insulation resistance and water drainage.
  Then conduct a test run to check that the air conditioner is operating properly.

• After the installation work, con rm that refrigerant gas does not leak. If refrigerant gas leaks into the room and ows near a re source, such as a cooking range, noxious gas may be generated.

Explanations given to user

• Upon completion of the installation work, tell the user where the circuit breaker is located. If the user does not know where the circuit breaker is, he or she will not be able to turn it off in the event that trouble has occurred in the air  conditioner.
• If you have discovered that the fan guard is damaged, do not approach the outdoor unit but set the circuit breaker to the OFF position, and contact a qualied service person(*1) to have the repairs done. Do not set the circuit breaker  to the ON position until the repairs are completed.
• After the installation work, follow the Owner’s Manual to explain to the customer how to use and maintain the unit.

Relocation

• Only a qualied installer(1) or qualied service person(1) is allowed to relocate the air conditioner. It is dangerous for the air conditioner to be relocated by an unqualied individual since a fire, electric shocks, injury, water leakage, noise and/or vibration may result.
• When carrying out the pump-down work shut down the compressor before disconnecting the refrigerant pipe.
  Disconnecting the refrigerant pipe with the service valve left open and the compressor still operating will cause air, etc. to be sucked in, raising the pressure inside the refrigeration cycle to an abnormally high level, and possibly  resulting in reputing, injury, etc.

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.

CAUTION
This air conditioner adopts the HFC refrigerant (R32) which does not destroy the ozone layer.
R32 refrigerant has a high working pressure and is apt to be affected by impurities such as water, oxidizing membrane, and oils. Therefore, during installation work, be careful that water, dust, previous refrigerant, refrigerating machine  oil, or other substances do not enter the R32 refrigeration cycle.
Special tools for R32 or R410A refrigerant are required for installation.
For connecting pipes, use new and clean piping materials, and make sure that water and/or dust does not enter.
Cautions for outdoor unit installation space
In the event that the outdoor unit is installed in a small space and refrigerant leaks, accumulation of highly concentrated refrigerant may cause a fi re hazard. Therefore, be sure to follow the installation space instructions in the  Installation Manual, and provide open space on at least one of the four outdoor unit sides.
In particular, when both the discharge and intake sides face walls and obstacles are also placed on both sides of the outdoor unit, take steps to provide space wide enough for a person to pass (600 mm or more) on one side to prevent  leaked refrigerant from accumulating.

To disconnect the appliance from main power supply
This appliance must be connected to the main power supply by means of a switch with a contact separation of at least 3 mm.
Do not wash air conditioners with pressure washers Electric leaks may cause electric shocks or fi res.
(*1) Refer to the “Definition of Qualified Installer or Qualified Service Person.”

Accessory parts

Installation of R32 refrigerant air conditioner

CAUTION
R32 refrigerant air conditioner installation
This air conditioner adopts the HFC refrigerant (R32) which does not destroy ozone layer.
Therefore, during installation work, make sure that water, dust, former refrigerant, or refrigerant oil does not enter the R32 refrigerant air conditioner cycle. To prevent mixing of refrigerant or refrigerant oil, the sizes of connecting sections of charge port on the main unit and installation tools are different from those of the conventional refrigerant units.
Accordingly, special tools are required for the R32 or R410A refrigerant units. For connecting pipes, use new and clean piping materials with high pressure fittings made for the R32 or R410A only, so that water and/or dust does not  enter.
When using existing piping, refer to “15 APPENDIX – [1] Existing piping”.

Required Tools/Equipment and Precautions for use
Prepare the tools and equipment listed in the following table before starting the installation work.
Newly prepared tools and equipment must be used exclusively.

Legend
: Conventional tools (R32 or R410A)
: Prepared newly (Use for R32 only)

Conventional tools (R410A)
Charging hose| Conventional tools (R410A)
Charging cylinder| Can not be used| Unusable (Use the electronic refrigerant charging scale)
Gas leak detector| Charging refrigerant| Conventional tools (R32 or R410A)
Vacuum pump| Vacuum drying| Conventional tools (R32 or R410A) Usable if the backflow prevention adapter is installed.
Vacuum pump with backflow prevention function| Vacuum drying| Conventional tools (R32 or R410A)
Flare tool| Flare machining of pipes| Conventional tools (R410A)

Installation conditions

Before installation
Be sure to prepare to the following items before installation.
Length of refrigerant pipe
< GM90>

• Caution during addition of refrigerant. When the total length of refrigerant piping exceeds 20 m, add 35 g/m of refrigerant up to a maximum total length of piping at 50 m. (Max. amount of additional refrigerant is 1050 g.)
  Charge the refrigerant accurately. Overcharging may cause serious trouble with the compressor.

• Do not connect a refrigerant pipe that is shorter than 5 m.
  This may cause a malfunction of the compressor or other devices.

Airtight test

1. Before starting an airtight test, further tighten the spindle valves on the gas and liquid sides.
2. Pressurize the pipe with nitrogen gas charged from the service port to the design pressure (4.15 MPa) to conduct an airtight test.
3. After the airtight test is completed, evacuate the nitrogen gas.

Air purge
To purge air, use a vacuum pump.
Do not use refrigerant charged in the outdoor unit to purge air. (The air purge refrigerant is not contained in the outdoor unit.)
Electrical wiring
Be sure to fix the power wires and system interconnection wires with clamps so that they do not come into contact with the cabinet, etc.

Earthing
WARNING
Make sure that proper earthing is provided.
Improper earthing may cause an electric shock. For details on how to check earthing, contact the dealer who installed the air conditioner or a professional installation company.
Proper earthing can prevent charging of electricity on the outdoor unit surface due to the presence of a high frequency in the frequency converter (inverter) of the outdoor unit, as well as prevent electric shock.
If the outdoor unit is not properly earthed, you may be exposed to an electric shock.
Be sure to connect the earth wire. (grounding work)
Incomplete grounding can cause an electric shock.
Do not connect ground wires to gas pipes, water pipes, lightning rods or ground wires for telephone wires.
Test run Turn on the leakage breaker at least 12 hours before starting a test run to protect the compressor during startup.
CAUTION
Incorrect installation work may result in a malfunction or complaints from customers.

Installation location
WARNING
Install the outdoor unit properly in a location that is durable enough to support the weight of the outdoor unit.
Insufficient durability may cause the outdoor unit to fall, which may result in injury.
Pay special attention when installing the unit onto a wall surface.
CAUTION
Do not install the outdoor unit in a location that is subject to combustible gas leaks.
Accumulation of combustible gas around the outdoor unit may cause a fire.
Install the outdoor unit in a location that meets the following conditions after the customer’s consent is obtained.
A well-ventilated location free from obstacles near the air intakes and air discharge.
A location that is not exposed to rain or direct sunlight.
A location that does not increase the operating noise or vibration of the outdoor unit.
A location that does not produce any drainage problems from discharged water.
Do not install the outdoor unit in the following locations.
A location with a saline atmosphere (coastal area) or one that is full of sulfide gas (hot-spring area) (Special maintenance is required).
A location subject to oil, vapor, oily smoke, or corrosive gases.
A location in which organic solvent is used.
Places where iron or other metal dust is present. If iron or other metal dust adheres to or collects on the interior of the air conditioner, it may spontaneously combust and start a fire.
A location where high-frequency equipment (including inverter equipment, private power generator, medical equipment, and communication  equipment) is used (Installation in such a location may cause malfunction of the air conditioner, abnormal control or problems due to noise from such equipment).
A location in which the discharged air of the outdoor unit blows against the window of a neighboring house.
A location where the operating noise of the outdoor unit is transmitted.
When the outdoor unit is installed in an elevated position, be sure to secure its feet.
A location in which drain water poses any problems.

CAUTION

1. Install the outdoor unit in a location where the discharge air is not blocked.
2. When an outdoor unit is installed in a location that is always exposed to strong winds like a coast or on the high stories of a building, secure normal fan operation by using a duct or wind shield.
3. When installing the outdoor unit in a location that is constantly exposed to strong winds such as on the upper stairs or rooftop of a building, apply the windproofi ng measures referred to in the following examples.

1. Install the unit so that its discharge port faces the wall of the building.
   Keep a distance 500 mm or more between the unit and wall surface.
2. Consider the wind direction during the operational season of the air conditioner, and install the unit so that the discharge port is set at a right angle relative to the wind direction.
   When using an air conditioner under low outside temperature conditions (Outside temp: -5°C or lower) in COOL mode, prepare a duct or wind shield so that it is not affected by the wind.

< Example>
Suction hood (Side)
Discharge hood

Necessary space for installation (Unit: mm)
Obstacle at rear side
Upper side is free

1. Single unit installation

2. Obstacles on both right and left sides
   The height of the obstacle should be lower than the height of the outdoor unit.

3. Serial installation of two or more units
   The height of the obstacle should be lower than the height of the outdoor unit.

Obstacle also above unit

Troubleshooting

You can perform fault diagnosis of the outdoor unit with the LEDs on the P.C. board of the outdoor unit in addition to using the check codes displayed on the wired remote controller of the indoor unit.
Use the LEDs and check codes for various checks. Details of the check codes displayed on the wired remote controller of the indoor unit are described in the Installation Manual of the indoor unit.

LED displays and check codes

• The LEDs and switches are located at the top right of the P.C. board of the outdoor unit as shown in the gure on the table below.

Appendix

Work instructions
The existing R22 and R410A piping can be reused for our digital inverter R32 product installations.
WARNING
Confirming the existence of scratches or dents on the existing pipes and confirming the reliability of the pipe strength are conventionally referred to the local site.
If the specfiied conditions can be cleared, it is possible to update existing R22 and R410A pipes to those for R32 models.
Basic conditions needed to reuse existing pipes
Check and observe the presence of three conditions in the refrigerant piping works.

1. Dry (There is no moisture inside of the pipes.)
2. Clean (There is no dust inside of the pipes.)
3. Tight (There are no refrigerant leaks.)

Restrictions for use of existing pipes
In the following cases, the existing pipes should not be reused as they are. Clean the existing pipes or exchange them with new pipes.

1. When a scratch or dent is heavy, be sure to use new pipes for the refrigerant piping works.
2. When the existing pipe thickness is thinner than the specified “Pipe diameter and thickness,” be sure to use new pipes for the refrigerant piping works.
   The operating pressure of R32 is high. If there is a scratch or dent on the pipe or a thinner pipe is used, the pressure strength may be inadequate, which may cause the pipe to break in the worst case.

• Pipe diameter and thickness (mm)Pipe outer diameter	∅6.4	09.5	012.7	015.9
  Thickness	R32/
  R410A	0.8	0.8	0.8	1.0

  R22

In case the pipe diameter is Ø12.7 mm or less and the thickness is less than 0.7 mm, be sure to use new pipes for the refrigerant piping works.

3. When the outdoor unit was left with the pipes disconnected, or the gas leaked from the pipes and the pipes were not repaired and re lled.
   There is the possibility of rain water or air, including moisture, entering the pipe.

4. When refrigerant cannot be recovered using a refrigerant recovery unit.
   There is the possibility that a large quantity of dirty oil or moisture remains inside the pipes.

5. When a commercially available dryer is attached to the existing pipes.
   There is the possibility that copper green rust has been generated.

6. When the existing air conditioner is removed after refrigerant has been recovered.
   Check if the oil is judged to be clearly different from normal oil.
   The refrigerator oil is copper rust green in color:
   There is the possibility that moisture has mixed with the oil and rust has been generated inside the pipe.
   There is discolored oil, a large quantity of residue, or a bad smell.
   A large quantity of shiny metal dust or other wear residue can be seen in the refrigerant oil.

7. When the air conditioner has a history of the compressor failing and being replaced.
   When discolored oil, a large quantity of residue, shiny metal dust, or other wear residue or mixture of foreign matter is observed, trouble will occur.

8. When temporary installation and removal of the air conditioner are repeated such as when leased etc.

9. If the type of refrigerator oil of the existing air conditioner is other than the following oil (Mineral oil), Suniso, Freol-S, MS (Synthetic oil), alkyl benzene (HAB, Barrel-freeze), ester series, PVE only of ether series.
   The winding-insulation of the compressor may deteriorate.

NOTE
The above descriptions are results have been confirmed by our company and represent our views on our air conditioners, but do not guarantee the use of the existing pipes of air conditioners that have adopted R32/R410A in other companies.

Curing of pipes
When removing and opening the indoor or outdoor unit for a long time, cure the pipes as follows:
Otherwise rust may be generated when moisture or foreign matter due to condensation enters the pipes.
The rust cannot be removed by cleaning, and new pipes are necessary.

• Total refrigerant quantity: Refrigerant quantity precharged at factory + Additional refrigerant quantity charged during installation

Warnings on refrigerant leakage

Check of concentration limit
The room in which the air conditioner is to be installed requires a design that in the event of refrigerant gas leaking out, its concentration will not exceed a set limit.
The refrigerant R32 which is used in the air conditioner is safe, without the toxicity or combustibility of ammonia, and is not restricted by laws to be imposed which protect the ozone layer. However, since it contains more than air, it  poses the risk of suffocation if its concentration should rise excessively. Suffocation from leakage of R32 is almost non-existent.
If a conditioner system is to be installed in a small room, select a suitable model and installation procedure so that if the refrigerant accidentally leaks out, its concentration does not reach the limit (and in the event of an emergency,  measures can be made before injury can occur).
In a room where the concentration may exceed the limit, create an opening with adjacent rooms, or install mechanical ventilation combined with a gas leak detection device.
The concentration is as given below.

Min. volume of the indoor unit installed room (m³)

Refrigerant Concentration Limit shall be in accordance with local regulations.

Toshiba Carrier (Thailand) Co., Ltd.
144 / 9 Moo 5, Bangkadi Industrial Park, Tivanon Road, Tambol Bangkadi, Amphur Muang, Pathumthani 12000, Thailand

References

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