10.6. Twin systems installation
10.6.1. General
1. Two indoor units can be operated simultaneously with a
single remote control unit. Note that individual operation is
not possible.
2. Master unit and slave-unit can be set automatically in twin
systems. No address setting is necessary.
3. Applicable “Twin” combination table.
• Should be the same capacity and the same model type.
10.6.2. Piping connections
1. The following table shows the pipe diameter for a twin-type
system. (Branch pipe kit should be used)
2. The following table shows the equivalent pipe lengths and
height differences for twin type systems.
Notes
• Use the main pipe to gain any rise or fall required for the
pipes.
• The number of bends should be 8 or less in a single
system (L+la, L+lb), and 15 or less overall.
• Branch pipes should be positioned horizontally.
10.6.3. Refrigerant charging
1. Calculate the piping length according to the following
table1.
• Calculation table 1. (piping length)
2. Calculate the additional amount of refrigerant according to
the following table 2. If the calculation table 1 result
exceeds 30m, additional gas charge necessary. (Additional
gas charge unnecessary for 30m or less from the
calculation result)
• Calculation table 2. (additional refrigerant gas charge
amount)
10.6.4. Wiring
73
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