Mitsubishi Electric PQHY-P72ZLMU-A Service Handbook page 33

[ II Restrictions ]
(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.
Function
Power ON/OFF by the
*1,*2,*3
plug
Automatic restoration
after power failure
*1. Do not cut off power to the heat source unit. Cutting off the power supply to the heat source 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. Set SW1-9 and SW1-10 to ON to control the external input from/output to the air conditioning units via AG-150A or G(B)-
50A using the PLC software for general equipment. With these settings made, the power start-stop function becomes dis-
abled. To use the auto recovery function after power failure while these settings are made, set SW1-5 to ON.
(6) 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.
(7) Various types of control using input-output signal connector on the heat source unit (various connection options)
Type
Input Prohibiting cooling/heating operation (thermo OFF) by an ex-
ternal input to the heat source unit.
* Usable for demand control of each refrigerant system
Performs a low level noise operation of the heat source unit by
an external input to the heat source unit.
* It can be used as the silent operation device for each refriger-
ant system.
Cooling/heating operation can be changed by an external input
to the heat source unit (OC).
Receives interlock operation signal input from the water circuit
pump (field-supplied)
Out- Outputs signals to perform interlocked operation of heat source
put unit and water circuit pump
Signal output patterns
*When DIP SW4 No.917 (SW6-10: ON) is set to off (factory
setting)
Signals are output while the compressor is in operation.
*When DIP SW4 No.917 (SW6-10: ON) is set to ON
Signals are output while receiving cooling or heating signal
from the controller.
*Signals are output even if the thermostat is OFF.
(when the compressor is not operating)
How to extract signals from the heat source unit
*It can be used as an operation status display device.
*It can be used for an interlock operation with external devic-
es.
*1. For detailed drawing, refer to "Example of wiring connection".
*2. For details, refer to the next section "Demand control".
HWE15150
Operation of the indoor unit when the operation is resumed after the unit
Indoor unit will go into operation regardless of its operation status before
power off (power failure). (In approx. 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 operation status before
power off (power failure).
Usage
was stopped
Function
DEMAND (level)
Low-noise mode
*3 *4
(level)
Auto-changeover
Pump interlock
operation signal
input
Pump interlock
operation signal
Operation status
of the compressor
Error status
- 24 -
*4 *5
Setting (SW1)
9 10
OFF ON
ON OFF
OFF ON
Terminal to be
Option
*1
used
*2
CN3D Adapter
for exter-
nal input
(PAC-
SC36NA-
E)
CN3N
TB-8 (between _
poles 3 and 4)
*Minimum guar-
anteed current at
no-voltage input
contact: 5 mA or
below
TB-8 (between _
poles 1 and 2)
*Contact rating:
208/230VAC 1A
or below
CN51 Adapter
for exter-
nal output
(PAC-
SC37SA-
E)
GB