Toshiba Carrier RAV-SM122BTP-UL Installation Manual page 20

Wiring between indoor unit and outdoor unit

1. Figure below shows the wiring connections between the indoor and outdoor units and between the indoor units
and remote controller. The wires indicated by the broken lines or dot-and-dash lines are provided locally.
2. Refer to the both indoor and outdoor unit wiring diagrams.
3. The power of the indoor unit is supplied from the outdoor unit.
Wiring diagram
Single system
Remote controller
Remote controller wiring
Indoor side A B
L1 L2 S
System interconnection
wires
Outdoor side L1 L2 S
Power supply
Simultaneous triple and double twin system
Remote controller
Remote controller
inter-unit wiring
Remote controller
wiring
A B
Indoor side
Indoor side
L1 L2 S
System
interconnection wires
Outdoor side
L1 L2 S
Power supply
* Use 2-core shield wire (MVVS AWG20 to AWG16 or more) for the remote controller wiring in the simultaneous
twin, simultaneous triple and simultaneous double twin systems to prevent noise problems. Connect both ends
of theshield wire to earth leads.
* Connect earth wires for each indoor unit in the simultaneous twin, simultaneous triple and simultaneous doublet
win systems.
37-EN
Simultaneous twin system
Remote controller
Remote controller
inter-unit wiring
Remote controller wiring
Indoor side A B
System interconnection wires L1 L2 S
Outdoor side
L1 L2 S
Power supply
Remote controller Remote controller
inter-unit wiring inter-unit wiring
A B A B
Indoor side Indoor side
L1 L2 S L1 L2 S
Indoor power Indoor power
inter-unit wiring inter-unit wiring
Triple
Double twin
– 19 –
Wire connection

REQUIREMENT
• Connect the wires matching the terminal numbers. Incorrect connection causes troble.
• Pass the wires through the bushing of wire connection holes of the indoor unit.
• Keep a margin (Approx. 3.9" (100 mm)) on a wire to hang down the electrical control box at servicing or other
purpose.
• The low-voltage circuit is provided for the remote controller. (Do not connect the high-voltage circuit)
• Before performing wiring work in the electrical control box, remove the
air filter and the cover of the box (fixed with 2 screws).
• Remove screw A, and loosen screw B.
• Pull up and open the electrical control box cover.
• Tighten the screws of the terminal block firmly, and fix the wires with
A B
Indoor
the cord clamps attached to the electrical control box.
side
L1 L2 S (Do not apply tension to the connecting section of the terminal block.)
• Slide the electrical control box cover to install it. Do not pinch the wire
Indoor power
and make the gap as small as possible when installing the cover.
inter-unit wiring
A B
L1 L2 S
Indoor power
inter-unit wiring
0.4" (10 mm)
2" (50 mm)
Earth wire
Remote controller wiring

Strip off approx. 0.4" (9 mm) the wire to be connected.
Wiring diagram
Terminal block for remote
controller wiringof indoor unit
Side D (Space: 0.3" (8.5 mm))
Cord clamp
Remote controller
Select side C or D for the power cable clamping position referring
wiring
to the following table according to the cable type and diameter.
* Cable clamp can be attached on either right or left side.
When twin system are connected, clamp two cables with one
Earth screw
cable clamp.
Wire type
Cabtyre cable 4-core stranded wire AWG14
System interconnection
wire
Cabtyre cable 4-core stranded wire AWG16
L1 L2 S
0.4" (10 mm)
1.1" (30 mm)
System interconnection wire
System interconnection wire
Terminal block
Remote
A
A
controller
B
B
unit
Remote controller wire
(Locally procured)
Electrical control
box cover
Loosen screw B.
Remove screw A.
Side C (Space: 0.2" (4 mm))
Specification Cable clamping position
Side D
Side C
See the figure on the left for
system interconnection wires to
the terminal block.
38-EN