Sanyo Big PACi 18 Series Technical Data & Service Manual page 159

2-16-2. Basic wiring diagram 2
Group control (when a central control device is not used)
A maximum of 8 indoor units can be connected to a single remote controller.
Example: In a refrigerant system where 2 or 3 indoor units are connected to 1 outdoor unit, set the new
system address (refrigerant system address) before turning ON the remote power switch.
(Refer to 2-16-3.) (Set using the system address black rotary switch on the outdoor unit control PCB.)
(for 3-phase outdoor unit)
2
Leakage breaker
Leakage breaker
Ground
Connection to lead wires
(Black / White)
1. Wall-mounted units do not include a terminal plate for connecting a remote controller.
2. For group control of wall-mounted units, connect the remote controller crossover wiring
to the remote controller connector (2P) on the main unit, as shown in the diagram.
(Wiring procedure)
(1) Set the No. 1 wall-mounted indoor unit so that it can be operated by the wireless remote controller.
(This is set at the time of shipment.)
On the indoor unit control PCBs, set the No. 2 and following wall-mounted units to the sub remote controller.
(Refer to 2-16-5.)
(2) Connect the crossover wiring to 1 and 2 on the remote controller wiring terminal plates of the No. 1 indoor
unit and the other indoor units (as shown in Basic wiring diagram 2).
(3) Connect the inter-unit control wiring to 1 and 2 on the No. 1 indoor unit terminal plate, and to 1 and 2 on
the outdoor unit terminal plate.
Connect the wiring in the same way from the other outdoor units to U1 and U2 on the indoor units terminal
plates (different refrigerant system).
(4) Perform automatic address setting from the outdoor unit. (For the automatic address setting procedure,
refer to 2-16-4.)
N O TE
* Models with auxiliary heaters cannot be used for "crossover wiring" of the indoor unit power wires.
(Use a pull box to divide the wiring.)
* Be sure to use the indoor unit temperature sensor (body sensor) when using this control. (Status at shipment)
Ground
System address rotary
switch (Change the
setting to "1".)
Leakage breaker
Outdoor unit
L1 L2 L3 N 1 2
Inter-unit control wiring
Wall-
L
Indoor
N
mounted
unit
type
No. 2
U1
Indoor
U2 Ground
unit
No. 1
Ground
System address rotary switch
(Change the setting to "2".)
Outdoor unit
L1 L2 L3 N 1 2
L L
Indoor
N N
unit
No. 3
U1 U1
U2 Ground U2
1 1
2 2
Remote controller crossover wiring
for group control (field-supply wiring)
(Thickness 0.5 – 2.0 mm
total length 200 m or less)
Fig. 2-12
2-14
Leakage breaker
Indoor power crossover
wiring – up to 16 units
(no-heater units only)
L
Indoor Indoor
N
unit unit
No. 4 No. 5
U1
Ground U2 Ground
1
2
Up to 8 units can be
set for group control
2 ,
L
N
U1
U2
1
2