Mitsubishi Electric Y Series Manual page 169

OUTDOOR UNIT FUNCTIONS
Operation mode
COP priority mode
Y-Series EP R2-Series EP
Y-Series P R2-Series P
The operation pattern under low ambient temperature conditions can be selected and the priority mode setting
("Capacity priority mode" and "COP priority mode") can be switched with the function settings.
Each mode is activated when the ambient temperature is below the specified temperature. For factory settings, refer to
the Data Book.
Low noise mode
Y-Series EP R2-Series EP WY-Series
Y-Series P R2-Series P WR2-Series
This mode reduces noise by limiting the compressor frequency and the number of rotations of the outdoor fan (for the
air-cooled outdoor unit).
The user can select a preferred level.
*Cooling/heating capacity drops during low-noise mode operation.
• Examples of sound pressure level in low noise mode (PUHY-P200YNW-A1 <cooling>)
Sound level of PUHY-P200YNW-A1(-BS)
90
Standard 50/60Hz
Low noise 50/60Hz
80
70
60
50
40
30
Approximate minimum
20
audible limit on
continuous noise
10
63 125 250 500
Octave band central frequency (Hz)
Smooth auto-shift startup mode
Y-Series EP Y-Series P R2-Series
Smooth auto-shift startup mode, an operation mode on the
outdoor unit, can now be selected in addition to the conven-
tional COP Priority and Capacity Priority modes. In order to
heat the room faster, Capacity Priority mode runs for 30
minutes when heating operation starts. The unit then switch-
es to COP Priority mode to increase energy-saving efficiency.
This enables both improved comfort and energy savings.
Smooth auto-shift startup mode
Approx 10%
COP Priority mode
Unit on (start-up)
* Time for preparation for heating is required.
* Each mode is activated when the ambient temperature is below the specified
temperature. For details on the settings, refer to the Data Book.
Sound pressure level with 100% fan
rotation and compressor frequency
Sound pressure level with 50% fan
NC-70
rotation and compressor frequency
NC-60
NC-50
NC-40
NC-30
NC-20
1k 2k 4k 8k
EP R2-Series P
Standard
30min
Operation time
Octave band central frequency (Hz)
63 125 250 500
Standard
mode (dB) 50/60Hz 58.0 61.0 60.0 57.0 50.5 46.0 44.5 42.0 58.0
Low noise
mode (dB) 50/60Hz 50.5 50.0 44.0 41.5 36.5 30.0 33.0 37.0 44.0
When Low noise mode is set, "Performance-priority mode" and
"Quiet-priority mode" can be selected. When "Performance-priority
mode" is selected, the system automatically returns to normal
operation in cases of heavy operating conditions.
Preheat defrost operation
Y-Series EP Y-Series P R2-Series
The outdoor unit is equipped with a preheat defrost operation
that raises the discharge temperature of the air before beginning
defrost operation. This contributes to raising the room
temperature before the start of defrost operation and prevents
room occupants experiencing a chilling sensation.
Preheat defrost ON/OFF
Heating Preheat defrost
Discharge
temperature
Example
Outdoor unit 18HP
Indoor temp. 20°C
Outdoor temp.
2°CDB/1°CWB
Heating load 100%
Room
temperature
Room temp. rises
before defrost*
1
Room temp. rises
*1 depending on heating load
dB(A)
1k 2k 4k 8k
EP R2-Series P
Defrost Restart of heating
Discharge temp. rises
20
by max %
Without Without
preheat preheat
defrost defrost
Without Without
preheat preheat
defrost defrost
169