Mitsubishi Electric Y Series Manual page 174

OUTDOOR UNIT FUNCTIONS
174
Demand control
Y-Series EP R2-Series
Y-Series P R2-Series
This function reduces the capacity of the outdoor/heat source unit by way of the external input to the outdoor unit.
The capacity of the outdoor unit can be reduced in steps, with patterns ranging from 2 to 12 control steps depending on
the system. The number of steps that can be set and the corresponding capacity are shown below.
• 2 steps (0-100%)
• 12 steps (0-17-25-34-42-50-59-67-75-84-92-100%)
Possible usage
When power consumption is centrally-controlled within a building, the system can be forced to operate in the
capacity-save mode by receiving external signals.
• System settings example
Relay circuit BMS etc.
(local design)
Continuous heating operation
Y-Series EP Y-Series
Normally, it is necessary to stop the heating operation during defrosting. However, the continuous heating operation
method makes it possible to perform defrosting without stopping the heating operation.
Reducing the stoppage time of the heating operation suppresses any drop in room temperature.
Use the dip switch on the outdoor unit to switch between the continuous heating operation method and conventional
defrosting method.
* Heating capacity drops during continuous heating operation.
Conventional defrosting operation
• Image of continuous heating operation (single unit)
The heat exchanger of the outdoor unit is divided into two parts. Even when defrosting is necessary, one part of the heat exchanger
continues the heating operation.
Conventional heating operation
Heating
operation
• Image of continuous heating operation (combination)
With the combination model, units perform defrosting and heating alternately. While one unit is
performing defrosting, the other continues heating.
Conventional heating operation
Heating
operation
EP WY-Series
P WR2-Series
• 4 steps (0-50-75-100%)
External input adapter
PAC-SC36NA-E
P R2-Series EP R2-Series P
Heating is stopped
during the defrosting
operation, so room
temperature drops.
Continuous heating operation
Defrosting
operation
Continuous heating operation
Defrosting
operation
• 8 steps (0-25-38-50-63-75-88-100%)
A command to reduce capacity is
sent to the outdoor unit
CN3D
(Outdoor unit control board)
Continuous heating operation
The two parts of the heat
exchanger perform defrosting
and heating alternately.
Heating
operation
The units perform defrosting
and heating alternately.
Heating
operation
Units operate at the
preset capacity.
You can enjoy a
comfortable
environment that is
Warm and
comfortable!
continuously heated.
Continuous heating operation
Heating Defrosting
operation
operation
During continuous heating
operation, the heating operation
continues, so the heating capacity
does not completely drop.
Continuous heating operation
Heating
Defrosting
operation
operation