Mitsubishi Electric CITY MULTI PUHY-P108 Service Handbook page 30

(6) 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.
Function
Power ON/OFF by the plug
Automatic restoration after power failure
*1. Requires that the dipswitch settings for all the units in the group be made.
*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
circuits will be turned on or off by the plug.
*4. 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.
(7) Miscellaneous settings
Cooling-only setting for the indoor unit: Cooling only model (Factory setting: SW3-1 "OFF.")
When using indoor unit as a cooling-only unit, set SW3-1 to ON.
(8) Various types of control using input-output signal connector on the outdoor unit (various connection options)
Type
Input Prohibiting cooling/heating operation (thermo OFF) by an external input to
the outdoor unit.
*It can be used as the DEMAND control device for each system.
Performs a low level noise operation of the outdoor unit by an external in-
put to the outdoor unit.
(The unit can perform a NIGHT MODE operation under the following con-
ditions: Outdoor air temperature below 30°C during cooling operation/Out-
door air temperature above 3°C during heating operation.)
Forces the outdoor unit to perform a fan operation by receiving signals
from the snow sensor.
Output How to extract signals from the outdoor unit
*It can be used as an operation status display device.
*It can be used for an interlock operation with external devices.
*1. NIGHT MODE is valid when Dip SW4-7 on the outdoor unit are set to OFF. When Dip SW4-7 are set to ON, STEP
DEMAND control is possible, using different configurations of NIGHT MODE input and compressor ON/OFF input set-
tings.
Operation of the indoor unit when the operation is
resumed after the unit was stopped
*2*3*4
Indoor unit will go into operation regardless of its oper-
ation status before power off (power failure). (In ap-
prox. 5 minutes)
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)
Indoor unit will remain stopped regardless of its opera-
tion status before power off (power failure).
Usage
- 21 -
[ II Restrictions ]
*1
Setting (SW1)
9 10
OFF ON
ON OFF
OFF OFF
Terminal
Function to be
used
Compressor CN3D
ON/OFF (level )
NIGHT MODE or
STEP DEMAND
*1
(level)
Snow sensor signal CN3S
input (level)
Operation status of CN51
the compressor
Error status