2
•
Systems • Installation
13
• Installation
2
Field wiring
2-1
cooling only / heat pump
2-1-3
Example of performing cool/heat setting of two or more outdoor units in block with cool/heat selector
•
For the wiring shown in front figure, be sure to use 0.75-1.25 mm
2
vinyl cords with sheath or cables (two-core). (Three-core cables can be used only
for the cool/heat selector.)
•
The wires above figure are field supply.
CAUTION
1
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: 1,000m
Total wiring length: 2,000m
Max branches No. of branches: 16
2
Up to 16 branches are possible for unit-to unit cabling. No branching is allowed after branching.
3
Never connect the power supply to unit-to-unit cabling terminal block. Otherwise the entire system may break down.
2-1-4
Sequential start
•
Make the outdoor unit cable connections shown below.
•
The outdoor unit PC board (A2P) is factory set at “Sequential start available”.
2-1-5
Setting the cool/heat operation
Heat Pump System
1.
Performing cool/heat setting with the remote control connected
to the indoor unit.
Keep the cool/heat selector switch (DS1-1) on the outdoor unit PC
board (A2P) at the factory setting position IN/D UNIT.
2.
Connect the optional remote control for COOL/HEAT changeover
to the outdoor unit printed circuit board (PCB) (A2P) and change
the COOL/HEAT setting switch (DS1-1) from IN (factory set) to
out.
CAUTION
1
For low-noise operation, it is necessary to get the optional “External control adapter for outdoor unit”.
2
For details, see the installation manual attached to the adapter.
Branch
Subbranching
(V1313)
A B C F1
F1
F2
F2
A B C F1
F1
F2
F2
A2P
A2P
lndoor unit
lndoor unit
(V1314)
TO IN/D
UNIT
F1 F2
C/H SELECTOR
F1 F2
F1 F2
F1 F2
Remote control
(V1315)
O
U
I
N
1 2 3 4 5 6 7 8
O N
O F F
DS1-1 Switch
DS1
A B C
A B C
COOL/HEAT
selector
(V1316)
C/H SELECTOR
O
U
T
I
N
1 2 3 4 5 6 7 8
O N
O F F
DS1-1 Switch
DS1
