Mitsubishi Electric Y Series Manual page 172

OUTDOOR UNIT FUNCTIONS
172
Energy efficiency control
Evaporating temperature control (during cooling)
Y-Series EP R2-Series
Y-Series P R2-Series
During cooling, the temperature of the refrigerant is controlled according to the air conditioning load. This helps to ensure
energy-efficient operation.
Normal mode
The evaporating temperature is
kept constant regardless of the
load. Even at low loads, the normal
evaporating temperature does not
change, and
generated during
operation.
Image of evaporating temperature control
1
(Fixed temperature control)
Condenser
During evaporating
temperature control
Evaporator
Enthalpy
The amount of compressor
work is reduced.
• Suitable situations
- Spaces with constant high temperatures from heat sources such as OA equipment
- During low load times when air conditioners are used for cooling (such as during the morning)
EP WY-Series
P WR2-Series
Smart evaporating temperature control mode
The evaporating temperature is increased and the compressor input is decreased
according to the load, resulting in increased operating efficiency.
There are two patterns for controlling the evaporating temperature, as follows.
1
energy loss is
partial load
2
* The availability of
* Changing the evaporating temperature reduces latent heat capacity. Select an appropriate pattern according to
* The fixed temperature control function and the automatic control shifting function cannot be used
During Evaporating
normal temperature is
operation
increased.
During evaporating
temperature control
During normal
operation
The evaporating temperature is controlled to be constant regardless of the ΔT. It is
set to a value that is higher than the normal evaporating temperature.
The evaporating temperature is controlled in accordance with the ΔT. It can be
selected from 4 control patterns.
1 and 2 varies depending on the model. Refer to the function table.
the installation conditions.
simultaneously.
Image of evaporating temperature control
2
(Automatic control in 4 patterns)
4 patterns for setting
target evaporating
temperature
Largest ∆T (temp. difference) of
IU inlet/set temp. (°C)
*1 To change the evaporating temperature setting, the setting of the dip switch on the
outdoor/heat source unit needs to be changed.
*2 When the difference between the indoor unit air-intake temperature and the actual temperature
exceeds 1°C, the evaporating temperature based on this difference is constant.
Increase of target
evaporating temperature
No.1
Lower compressor
No.2
frequency
No.3
No.4
Reduced power
consumption