Daikin VRV II Series, Design, Installation & Testing Instructions, Page: 193 / 242

Si39-303 Field Wiring
Installation Manual 187
Caution Be sure to follow the limits below. If the unit-to-unit cables are beyond these limits, it may result
in malfunction of transmission.
Maximum wiring length: 1000m
Total wiring length: 2000m
Max branches No. of branches: 16
Max. number of outdoor units connectable: 10 or less
Up to 16 branches are possible for unit-to unit cabling. No branching is allowed after branching.
Max. number of outdoor units connectable: 10 or less
Never connect the power supply to unit-to-unit cabling terminal block. Otherwise the entire
system may break down.
Sequential start
Make the outdoor unit cable connections shown below.
The outdoor unit PC board (A1P) is factory set at “Sequential start available“.
Setting the cool/heat operation (heat pump unit only)
1. Performing cool/heat setting with the remote controller connected to the indoor unit.
Keep the cool/heat selector switch (DS1) on the outdoor unit PC board (A1P) at the factory
setting position IN/D UNIT.
2. Performing cool/heat setting with the cool/heat selector.
Connect the cool/heat selector remote controller (optional) to the A/B/C terminals and set the
cool/heat selector switch (DS1) on the outdoor unit PC board (A1P) to OUT/D UNIT.
1. Branch
2. Subbranch
2
1
TO IN/D
UNIT
F1 F2
DS1
1 2 3 4
OFF
ON
O
U
T
I
N
F1 F2 F1 F2 F1 F2
Remote controller
A B C
A B C
DS1
1 2 3 4
OFF
ON
O
U
T
I
N
Cool/heat selector