Panasonic Cu W18bbp5 Cu 24bbp5 Cu W34bbp8 Cu W43bbp8 Series Repair Manual

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18.1.1. Operation
 
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Simultaneous air conditioning of wide spaces and corners is
possible. Indoor units with different horsepower can even
be used in combination.
 
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Master units and slave-units can be set automatically in twin
systems. No address setting is necessary.
 
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Multiple indoor units can be operated simultaneousl y with a
single remote control unit. Note that individual operation is
not possible.
18 TWIN OPERATION
18.1. TWIN
(Twinoperation setting)...

Automatic address setting fortwinsystem
Procedure:Turn on the power supply for the indoor and outdoor units.
Operation:Automatic address setting will start 10 to 30 seconds after the power supply is turned on, and will be completed after about 1
minute.
If the power supplies for the indoor unit and outdoor unit cannot be turned on at the same time, turn on the power supply for the
outdoor unit, the indoor unit which is connected to the remote control, and then the other indoor units in that order.
If the...

Function Automatic address resetting fortwinsystem s
 
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This clears the current twin addresses which have been set automatically , and causes automatic twin address setting to be
carried out once more.
Procedure:Press the ADDRESS RESET switch SW3 (push button switch) on the outdoor unit circuit board continuously until LEDs 2 to 8 on
the outdoor unit circuit board are all illuminated (takes approx. 3.5 seconds).
Operation:The outdoor unit will reset the addresses for the indoor units which...

 
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The branch pipe should be horizon tal to or perpendicular to the indoor unit.

 
Installing branch pipes
18.3. Refrigerant charging
 
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For twin systems
The pipe length is the total of the branch pipe (L) and the junction pipes (Ia→
tIb→
t Ic in order from the thickest diameter). At
the point where the pipe length exceed s 30 m, determine the amoun t of refrigerant for the remaining liquid-side pipe diameters
and pipe lengths from the following table in order to charge...

18.4. Wiring
Whenboth indoor and outdoor unit draw power
(Example: 3 Phase power supply model)
When only theoutdoor unit draws power
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19 WIRING MISTAKE PREVENTION
Improved quality of installation work through adoption of an “Connection error prevention” circuitwhichpreven ts wiring
mistakes
Conne ction errors with the control wires and the power supply wires will not only contribute to burning-out of the control circuit
board, but can also cause large-scale working losses and affect reliability. If a circuit board with a “Connection error prevention”
circuit is used, the relay will not operate if the wires have been connected...