Mitsubishi Electric PFD-P250VM-E Service Manual page 24

(2) Power supply switch connector connection on the outdoor unit
(Factory setting: The male power supply switch connector is connected to CN41.)
Grouping system
Grouped indoor
units connected to
one outdoor unit
Grouped indoor
Not connected
units connected to
different outdoor
With connection
units
to indoor-outdoor
transmission line
With connection
line for centralized
(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.)
(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.
Remove the cover on the remote controller
Insert a flat-head screwdriver in the
groove shown in the picture, and
move the screwdriver in the direction
shown in the arrow.
Set Dip Switch No.1 on the remote
controller to "OFF" (Main to Sub)
(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.
Connection to Power supply unit
the system for transmission
controller lines
Not required
Not required
to transmission
(Powered from
the outdoor unit)
control
Required
Grouping the indoor
units connected to
Power supply switch connector connection
different outdoor
units
Leave the male connector on CN41 as it is.
(Factory setting)
Not grouped
Disconnect the male connector from the female
Grouped
power supply switch connector (CN41) and connect
it to the female power supply switch connector
Grouped
(CN40) on only one of the outdoor units (OC).
/Not grouped
*Connect the S (shielded) terminal on the terminal
block (TB7) on the outdoor unit whose male
connector on CN41 was disconnected and
Grouped
connected to CN40 to the earth terminal (
/Not grouped
the control box.
Grouped Leave the male connector on CN41 as it is.
/Not grouped (Factory setting)
Screwdriver
ON
1 2 3 4
Dip switches
22
Remote controller body
) on