Mitsubishi Electric PUHY-P250YHM-A Data Book page 27

(2) Power supply switch connector connection on the outdoor unit
(Factory setting: The male power supply switch connector is connected to CN41.)
Connection to
System
the system
configuration
System in which indoor
units connected to one
outdoor unit
System in which indoor
Not connected
units connected to
multiple outdoor units
With connection
to indoor-outdoor
transmission line
With connection
to transmission
line for centralized
✻
When the system controller is connected to the indoor/outdoor transmission line and the power is supplied from the outdoor unit,
do not to turn off the outdoor unit. If its power supply is cut, the power is not supplied to the system controller, and the functions
will not work.
(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.
Power supply unit
for transmission
controller lines
Not required
Not required
(Powered from
the outdoor unit)
control
Required
23
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 Remote controller body
) on