Hitachi YUTAKI S80 Series Technical Catalogue page 33

2. Features and benefits
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.
Set temperature
- 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.
High power
operation
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.
• Acoustically insulated compressor: The scroll compressor is insulated by means of a acoustic cover, providing mini-
mum noise levels.
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TCGB0075 rev.0 - 11/2012
Setting temperature (in heating mode)
RAS-H(V)RNME-AF
Machine with constant speed
Time
Power consumption (in heating mode)
Energy saving
operation
Machine with constant
RAS-H(V)RNME-AF
Time
speedS
Optimized rotor shape
Electromagnetic
For compressor motor,
before changing the rotor
Frequency (Hz)
Electromagnetic noise
reduced
For compressor motor,
after changing the rotor
Frequency (Hz)
2