Mitsubishi Electric PQHY-P72TYHMU-A Service Handbook page 30

[ II Restrictions ]
(2) Power supply switch connector connection on the heat source unit
(Factory setting: The male power supply switch connector is connected to CN41.)
There are limitations on the total number of units that are connectable to each refrigerant system. Refer to the DATABOOK
for details.
System configura- Connection to
tion the system con-
troller
System with one
heat source unit
System with multi- Not connected
ple heat source
units
With connection
to the indoor-
heat source
transmission
line
With connection
to the central-
ized control sys-
tem
*1 The need for a power supply unit for transmission lines depends on the system configuration.
*2 The replacement of the power jumper connector from CN41 to CN40 must be performed on only one heat source unit in
the system.
(3) Settings for the centralized control switch for the heat source unit (Factory setting: SW2-1 are set to OFF.)
System configuration
Connection to the system controller
Connection to the system controller
*1. Set SW2-1 on all heat source units in the same refrigerant circuit to the same setting.
*2. When only the LM adapter is connected, leave SW2-1 to OFF (as it is).
(4) Selecting the position of temperature detection for the indoor unit (Factory setting: SW1-1 set to "OFF".)
To stop the fan during heating Thermo-OFF (SW1-7 and 1-8 on the indoor units to be set to ON), use the built-in thermistor
on the remote controller or an optional thermistor.
1) To use the built-in sensor on the remote controller, set the SW1-1 to ON.
ŒSome models of remote controllers are not equipped with a built-in temperature sensor.
Use the built-in temperature sensor on the indoor unit instead.
ŒWhen 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.
ŒWhen using an optional temperature sensor, install it where room temperature can be detected.
HWE09080
Power supply unit
for transmission
lines
_ _
_
Not required
*1
Not required
(Powered from
the heat source
unit)
Required *1
Not connected
*2
Connected
- 21 -
Group operation Power supply switch connector connection
of units in a sys-
tem with multiple
heat source
units
_ Leave CN41 as it is
(Factory setting)
Not grouped
Grouped Disconnect the male connector from the fe-
male power supply switch connector (CN41)
Grouped/not
and connect it to the female power supply
grouped
switch connector (CN40) on only one of the
heat source units.
*Connect the S (shielded) terminal on the
terminal block (TB7) on the heat source
unit whose CN41 was replaced with CN40
Grouped/not
to the ground terminal ( ) on the electric
grouped
box.
Grouped/not Leave CN41 as it is
grouped (Factory setting)
Centralized control switch settings
Leave it to OFF. (Factory setting)
ON
*2
*1
GB