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CONTENTS
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PRECAUTIONS FOR SAFETY
The two indoor units of TOSHIBA simultaneous twin packaged air conditioning system are the same units. Set and
install the main and sub units taking the installation site into consideration. (Be certain to use the new refrigerant
R410A in the indoor units.) The indoor unit connected to the remote controller switch will be the main unit.
• Ensure that all Local, National and International regulations are satisfied.
• Read indoor, outdoor installation manual and this manual carefully before Installation.
• The precautions described below include the important items regarding safety. Observe them without fail.
• After the installation work, perform a trial operation to check for any problem.
Follow the Owner's Manual to explain how to use and maintain the unit to the customer.
• Turn off the main power supply switch (or breaker) before the unit maintenance.
• Ask the customer to keep the Installation Manual together with the Owner's Manual.
CAUTION
New Refrigerant Air conditioner Installation
• THIS AIR CONDITIONER ADOPTS THE NEW HFC REFRIGERANT (R410A) WHICH DOES NOT DESTROY OZONE
LAYER.
• The characteristics of R410A refrigerant are; easy to absorb water, oxidizing membrane or oil, and its pressure is approx. 1.6
times higher than that of refrigerant R22. Accompanied with the new refrigerant, refrigerating oil has also been changed.
Therefore, during installation work, be sure that water, dust, former refrigerant, or refrigerating oil does not enter the
refrigerating cycle.
• To prevent charging an incorrect refrigerant and refrigerating oil, the sizes of connecting sections of charging port of the main
unit and installation tools are changed from those for the conventional refrigerant.
• Accordingly the exclusive tools are required for the new refrigerant. (R410A)
• For connecting pipes, use new and clean piping designed for R410A, and please care so that water or dust does not enter.
Moreover, do not use the existing piping because there are problems with pressure-resistance force and impurity in it.
• The two indoor units of TOSHIBA simultaneous twin packaged air conditioning system are the same units.
• Set and install the main and sub units taking the installation site into consideration.
(Be certain to use the new refrigerant R410A in the indoor units.)
The indoor unit connected to the remote controller switch will be the main unit.
CAUTION
Wiring
• TO DISCONNECT THE APPLIANCE FROM MAIN POWER SUPPLY
• This appliance must be connected to the main supply by means of a switch with a contact separation of at least 3mm.
• The remote controller switch cannot be connected to both of the two indoor units (main and sub units).
Connect it only to the indoor unit that will become the main indoor unit (Unit A). Connecting the remote controller switch to the
sub indoor unit will cause malfunction.
CAUTION
Refrigerant Piping (Branch piping system is used for refrigerant piping)
• Compared with R22, pressure of R410A is about 1.6 times. Unless the piping is installed correctly, gas leak may be caused
during operation such as pressure boosting. Conduct a leak test of the pipe connecting parts correctly.
• In case the actual length of the piping exceeds the standard piping length, accurately add the refrigerant referring to
Additional Refrigerant Amount.
• Thermal insulation materials for the branch pipes are not supplied as accessories. Provide thermal insulation correctly using
fitting covers or other materials sold on the market. For further information, read Refrigerant Piping and Piping Thermal
Instruction on this manual.
Improper thermal insulation work will result in a failure and a claim.
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