Multiple Outdoor Units Control - Mitsubishi Electric PAC-IF051B-E Installation Manual

. Multiple outdoor units control

.1 Wiring for multiple outdoor units control
To establish a larger system, up to 6 outdoor units of the same model can be connected in one system.
Note: PUHZ-FRP outdoor unit is not available for multiple outdoor units control.
.1.1 Requirements
<Outdoor unit>
(a) Up to 6 units can be connected.
(b) All the outdoor units must be of the same model.
(c) The outdoor units must be connected to slave units.
<FTC: Master unit>
Each slave unit is controlled by the master unit.
(a) The outdoor units must NOT be connected to the master unit.
Make sure that the master unit is powered by independent source.
(b) Wire the main controller to TBI.2 13-14 on the master unit.
(c) Wire the electric heater to the master unit.
<FTC: Slave unit>
The hydrobox or PAC-SIF051B-E is used as a slave unit
(a) Connect each outdoor unit to a slave unit.
(b) The main controller must NOT be wired to a slave unit.
5
Max 6 units
Outdoor unit
Max 6 units
Outdoor unit
FTC4
FTC4
(Slave)
(Master)
controller
Master
FTC4
(Slave)
Slave
FTC4
(Master)
controller
Master
Hydrobox
Hydrobox
Slave
Main
Main