Hitachi YUTAKI S80 Series - Page 33

2. Features and benets
TCGB0075 rev.0 - 11/2012
33
2
Low noise
• Inverter control: The inverter controls compressor speeds from 30Hz to 115Hz, quickly reaching the set temperature
and maintaining a stable energy-saving operation, thus reducing the noise since the compressor is not running conti-
nuously.
Setting temperature (in heating mode)
Room temperature
Set temperature
RAS-H(V)RNME-AF
Machine with constant speed
Time
- In the case of RAS-H(V)RNME-AF: Quickly reaches the temperature set at high power, then maintains stable
energy-saving operation.
- In the case of other constant speed machines: Slowly reaches the set temperature, then turns on and off repeate-
dly to maintain the temperature, operating uneconomically and wasting energy.
Power consumption (in heating mode)
Compressor (rpm)
High power
operation
Energy saving
operation
Machine with constant speedS
RAS-H(V)RNME-AF
Time
- In case of existing machines with constant speed, repeated turning on and off wastes energy.
• Optimized rotor shape: The scroll compressor allows reduced noise and vibration levels due to:
- The compression points are evenly distributed
along the compression stroke.
- The reduced number of components used
- Use of a high-pressure insulation shell.
Optimized rotor shape
Electromagnetic
For compressor motor,
before changing the rotor
Frequency (Hz)
Electromagnetic noise
reduced
Frequency (Hz)
Noise
Noise
For compressor motor,
after changing the rotor
• Acoustically insulated compressor: The scroll compressor is insulated by means of a acoustic cover, providing mini-
mum noise levels.