108
MUL
TI V 5 Outdoor Unit Installation Manual
Due to our policy of continuous product innovation, some specifications may change without notification.
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WARNING
• Ground wiring is required to prevent accidental electrical shock during current leakage, communication problems from electrical noise, and
motor current leakage.
Do not connect the ground line to the pipes. There is risk of fire, electric shock, explosion, physical injury or
death.
•
Never ground the shield of the communications cable to the indoor unit frame or other grounded entities of the building. Inadequate
connections may generate heat, cause a fire, and physical injury or death.
• Always verify the communication cable is connected to a communications terminal on the outdoor unit(s). Never apply line voltage power to
the communication cable connection. If contact is made, the PCBs may be damaged.
•
Never use a common multiple-core communications cable. Each communications bus shall be provided a separate cable (i.e., between
outdoor unit(s) and indoor units, outdoor units and central controller(s). If communications cables of separate systems are wired using a
common multiple-core cable, it will result in a poor communications signal and unacceptable system operation.
The terminals labeled “GND” are NOT ground terminals. The terminals labeled ARE ground terminals. Inadequate connections may generate
heat, cause a fire, and physical injury or death.
WARNING
Close up of Master Outdoor Unit to Slave Outdoor Unit(s) Communication Cable Connections.
Heat Pump Operation
Communications Cable Between Master Outdoor Unit and Indoor Unit
B
ODU
IDU
CENTRAL DRY1 DRY2 GND 12 V
A
B
A
B
A
Master Outdoor Unit Communication Terminal Block
B
ODU
IDU
CENTRAL
DRY1 DRY2 GND 12 V
A
B
A
B
A
B
DRY1 DRY2 GND 12 V
A
B
A
B
A
B
DRY1 DRY2 GND 12 V
A
B
A
4(B)
3(A)
4(B)
3(A)
B
A
Communications Cable Between Master Outdoor Unit and Slave Outdoor Unit(s)
Master Outdoor Unit Communication Terminal Block
Slave 1 Outdoor Unit Communication Terminal Block
Slave 2 Outdoor Unit Communication Terminal Block
Indoor Unit
Indoor Unit
ODU
IDU
CENTRAL
ODU
IDU
CENTRAL
ELECTRICAL
Communication Cable Specifications
• Make sure that the terminals match (A to A, B to B). Maintain polarity throughout the communication network. The system will malfunction if
not properly wired.
•
Do not include splices or wire nuts in the communication cable.
