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2.4.2.
Separate indoor/outdoor unit
power supplies
The power supply can be connected to (1) just the outdoor
units, or (2) to both indoor and outdoor units.
2.4.4.
Group control equipment
2.4.5.
Twin operation
• • • • Simultaneous air conditioning of wide spaces and corners is
possible. Indoor units of different horsepowers and models
can even be used in combination.
• • • • Master unit and slave-units can be set automatically in twin
systems. No address setting is necessary.
• • • • Multiple indoor units can be operated simultaneously with a
single remote control. Note that individual operation is not
possible.
2.4.3.
Automatic setting initialization
function (Remote control and
Indoor unit)
In accordance with the indoor and outdoor units connected and
the connection methods, conditions such as the configuration
(twin or triple format) and remote-control functions such as
cooling only or heat pump model are automatically detected
and set instantly.
2.5.
New refrigerant Series [R407C]
pipe installation
2.5.1.
Procedure
• • • • The new refrigerant (R407C) has a different composition to
the previously-used refrigerant (R22), so some contents
and method of pipe installation and charging work are
different from before. Care should be taken when carrying
out this work.
2.5.2.
Installation and precautions
2.5.2.1.
Before installation
1. Determine the installation division.
2. Check the refrigerant to be used.
• • • • Check that the refrigerant is R407C.
• • • • Check that the gauge pressure is at a maximum of 3.3
MPa.
3. Make a drawing of the Installation.
2.5.2.2.
Installation
1. Install the sleeve and the insert.
2. Install the indoor unit.
3. Install the refrigerant piping.
• • • • Pipe materials
• • • • Refrigerant pipes which were previously used to carry
R22 must not be re-used. If replacing the indoor and
outdoor units, be sure to replace all refrigerant pipes
also.
• • • • Check the pipe thickness.
• • • • Clean the inside of the pipes.
6
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