Mitsubishi Electric City Multi PQHY-P72 Service Handbook page 29

[ II Restrictions ]
(2) Power supply switch connector connection on the outdoor (heat source) unit
(Factory setting: The male power supply switch connector is connected to CN41.)
System configura-
tion
System with one
outdoor (heat
source) unit
System with multi-
ple outdoor (heat
source) units
*1 The need for a power supply unit for transmission lines depends on the system configuration.
*2 When connecting a system controller to the transmission line for centralized control or performing a group operation
of units in different refrigerant systems, the replacement of male power supply switch connector (CN41) must be
performed only on one of the outdoor (heat source) units in the system.
(3) Settings for the centralized control switch for the outdoor (heat source) unit (Factory setting: SW2-1 are set to OFF.)
Connection to the system controller
Connection to the system controller
*1. When only the LM adapter is connected, leave SW2-1 to OFF (as it is).
(4) Indoor unit port switch setting (R2 or WR2 series (factory setting: "0" ))
Make the setting for the port switch that corresponds to the connected BC (main/sub) controllers.
When more than two ports are used, make the setting on the port with a smaller port number.
The total capacity and the number of connectable indoor units per port is 54 and below, and 3 respectively.
(5) Selecting the position of temperature detection for the indoor unit (Factory setting: SW1-1 set to "OFF".)
1) To use the built-in sensor on the remote controller, set the SW1-1 to ON.
Some models of remote controllers are not equipped with a built-in temperature sensor.
Use the built-in temperature sensor on the indoor unit instead.
When using the built-in sensor on the remote controller, install the remote controller where room temperature can be
detected.
(Note) Factory setting for SW1-1 on the indoor unit of the All-Fresh Models is ON.
2) When an optional temperature sensor is used, set SW1-1 to OFF, and set SW3-8 to ON.
When using an optional temperature sensor, install it where room temperature can be detected.
Connection to the Power supply unit for
system controller transmission lines
_
Not connected
With connection to Not required
the indoor unit sys-
tem
With connection to Not required
the centralized con- (Powered from the
trol system outdoor (heat source)
unit)
Required
System configuration
Not connected
*1
Connected
Group operation of
units in a system with
multiple outdoor (heat
source) units
_ _
_ Not grouped
Grouped
Grouped/not grouped
*1
Grouped/not grouped
Grouped/not grouped
Centralized control switch settings (SW2-1)
Leave it to OFF. (Factory setting)
ON
- 20 -
Power supply switch con-
nector connection
Leave CN41 as it is
(Factory setting)
Disconnect the male con-
nector from the female
power supply switch con-
nector (CN41) and con-
nect it to the female power
supply switch connector
(CN40) on only one of the
outdoor (heat source)
*2
units.
*Connect the S (shielded)
terminal on the terminal
block (TB7) on the out-
door (heat source) unit
whose CN41 was re-
placed with CN40 to the
ground terminal ( ) on
the electric box.
Leave CN41 as it is
(Factory setting)