Mitsubishi Electric PUHY-P120YHMU-A, Service Manual

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[
II
Restrictions ]
- 21 - HWE0804A GB
(2) Power supply switch connector connection on the outdoor unit
(Factory setting: The male power supply switch connector is connected to CN41.)
*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 outdoor unit in the
system.
(3) Settings for the centralized control switch for the outdoor unit (Factory setting: SW2-1 are set to OFF.)
*1 Set SW2-1 on all outdoor 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.
Œ
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.
ΠWhen 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.
Œ
When using an optional temperature sensor, install it where room temperature can be detected.
(5) Various start-stop controls (Indoor unit settings)
Each indoor unit (or group of indoor units) can be controlled individually by setting SW 1-9 and 1-10.
*1. Do not cut off power to the outdoor unit. Cutting off the power supply to the outdoor unit will cut off the power supply to the
crankcase heater and may cause the compressor to malfunction when the unit is put back into operation.
*2. Not applicable to units with a built-in drain pump or humidifier.
*3. Models with a built-in drain pump cannot be turned on/off by the plug individually. All the units in the same refrigerant cir-
cuits will be turned on or off by the plug.
*4. Requires that the dipswitch settings for all the units in the group be made.
*5. To control the external input to and output from the air conditioners with the PLC software for general equipment via the
G(B)-50A, set SW1-9 and SW1-10 to ON. With these settings made, the power start-stop function becomes disabled. To
use the auto recovery function after power failure while these settings are made, set SW1-5 to ON.
System configu-
ration Connection to
the system con-
troller Power supply unit
for transmission
lines Group operation
of units in a sys-
tem with multiple
outdoor units Power supply switch connector connection
System with
one outdoor unit _ _ _ Leave CN41 as it is
(Factory setting)
System with
multiple outdoor
units Not connected _ Not grouped
Grouped Disconnect the male connector from the fe-
male power supply switch connector (CN41)
and connect it to the female power supply
switch connector (CN40) on only one of the
outdoor units.
*2
*Connect the S (shielded) terminal on the ter-
minal block (TB7) on the outdoor unit whose
CN41 was replaced with CN40 to the
ground terminal (
) on the electric box.
With connection
to the indoor
unit system Not required Grouped/not
grouped
With connection
to the central-
ized control
system Not required
*1
(Powered from the
outdoor unit)
Grouped/not
grouped
Required *
1
Grouped/not
grouped Leave CN41 as it is
(Factory setting)
System configuration Centralized control switch settings *
1
Connection to the system controller Not connected Leave it to OFF. (Factory setting)
Connection to the system controller Connected *
2
ON
Function
Operation of the indoor unit when the operation is resumed after the unit was
stopped
Setting (SW1)
*4 *5
9 10
Power ON/OFF by
the plug
*1,*2,*3
Indoor unit will go into operation regardless of its operation status before power
off (power failure). (In approx. 5 minutes) OFF ON
Automatic restoration
after power failure Indoor unit will go into operation if it was in operation when the power was
turned off (or cut off due to power failure). (In approx. 5 minutes) ON OFF
Indoor unit will remain stopped regardless of its operation status before power
off (power failure). OFF ON