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(5) Connection of two refrigerant circuits
When two refrigerant circuits are connected on site, make the switch settings on the controller circuit
board following the instructions described in the installation manual for the indoor unit.
(4) Setting the MA “Sub” controller
When using two remote controllers or running two indoor units as a group, one of the controllers must be
set to “Sub” controller.
✻
No more than two remote controllers can be connected to a group.
(Factory setting: “Main”)
Set the controller according to the following procedure. Refer also to the instructions manual supplied with
the MA remote controller.
Remote controller body
Dip switches
1
ON
2
3
4
Screwdriver
Remove the cover on the remote controller
Set Dip Switch No.1 on the remote
controller to “OFF” (Main to Sub)
Insert a flat-head screwdriver in the
groove shown in the picture, and
move the screwdriver in the direction
shown in the arrow.
(3) Choosing the temperature detection spot by indoor unit (Factory Setting: SWC “Standard”)
When using the suction temperature sensor, set SWC to “Option.”
(The discharge temperature sensor is supplied as standard specification.)
(2) Power supply switch connector connection on the outdoor unit
(Factory setting: The male power supply switch connector is connected to CN41.)
Grouping system
Power supply switch connector connection
Not connected
Not grouped
Grouped
Required
Grouped
/Not grouped
Grouped
/Not grouped
Grouped
/Not grouped
Not required
Leave the male connector on CN41 as it is.
(Factory setting)
Leave the male connector on CN41 as it is.
(Factory setting)
Grouped indoor
units connected to
one outdoor unit
Connection to
the system
controller
With connection
to indoor-outdoor
transmission line
With connection
to transmission
line for centralized
control
Power supply unit
for transmission
lines
Not required
(Powered from
the outdoor unit)
Grouping the indoor
units connected to
different outdoor
units
Grouped indoor
units connected to
different outdoor
units
Disconnect the male connector from the female
power supply switch connector (CN41) and connect
it to the female power supply switch connector
(CN40) on only one of the outdoor units (OC).
*Connect the S (shielded) terminal on the terminal
block (TB7) on the outdoor unit whose male
connector on CN41 was disconnected and
connected to CN40 to the earth terminal ( ) on
the control box.
