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10-3. Control cable specifications
・Transmission cable
Type
2-core shielded cable CVVS, CPEVS, or MVVS
Size
1.25 mm
(AWG 16), or ø1.2 mm or above
2
Length
Max. 200 m (656 ft)
The maximum allowable length of transmission cables via outdoor units (indoor-outdoor transmission cables) is 500 m
Remarks
(1640 ft).
The maximum allowable length of transmission cables from the power supply unit to each outdoor unit is 200 m (656 ft).
* Do not use a single multiple-core cable to connect indoor units that belong to different refrigerant systems. The use of a multiple-core cable
may result in signal transmission errors and malfunctions.
* Ensure shield continuity when extending the transmission cable.
10-4. System configuration
・Unit code and the maximum number of connectable units
Two-outdoor-unit system
Unit type
Outdoor unit
Indoor unit
Single-outdoor-unit system
Unit type
Outdoor unit
Indoor unit
* The outdoor units in the same refrigerant circuit are automatically designated as OC and OS. The outdoor units are designated as OC and OS
in the order of address from large to small.
* Do not connect the MA/ME remote controllers or the system controllers to the system.
・System configuration example
* The numbers in the parentheses in the figures below indicate address numbers.
Ⓐ
Ⓐ
Shielded cable
*1 Daisy-chain terminals (TB3) on outdoor units together in the same refrigerant system.
*2 Leave the power jumper connected to CN41.
Maximum allowable length of control cables
Transmission cables
VG79D920H01
Code
Main unit
OC
Sub unit
OS
IC
Code
Main unit
OC
IC
(1)
(M-NET)
A B S
Number of connectable units
–
–
1 to 10 units per OC
Number of connectable units
–
1 to 10 units per OC
(2)
(3)
(M-NET)
(M-NET)
A B S
A B S
L
+ L
+ L
+ L
≤ 200 m (656 ft)
1
2
3
4
30
4
(4)
(M-NET)
A B S
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