Hitachi YUTAKI S80 Series - Page 30

2. Features and benets
TCGB0075 rev.0 - 11/2012
30
DC fan motor with outstanding efciency
The DC fan motor greatly improves efciency compared to conventional products with AC motors. In addition, air blasts are
reduced by controlling the rotation speed of the fan. Stable operation is provided against strong head winds of approxima-
tely 10m/s on the front face of the outdoor unit.
Revolutions per Min. (rpm)
DC motor
Efficiency increased by 40%
(motor power consumption
halved).
AC motor
Motor efficiency (%)
PWM (pulse width modulation) concept of speed control
The switching element (a power MOSFET) switches back and forth at a frequency of several tens of kHz. This controls the
ON/OFF duty rate per cycle and changes the voltage applied to the fan motor to control the rotation speed.
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HITACHI scroll compressors (R410A for the outdoor unit and R134a for the indoor unit)
Highly efcient scroll compressor
The HITACHI DC INVERTER scroll compressor has been developed to increase efciency, reliability and to reduce power
input.
New drive
mechanism Oil
feeding mecha-
nism etc.,
DC-Inverter
Motor
Newly-
developped
scroll for
410A
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AsymmetricScrollLap
N
E
W
Sub-bearing
SHUT OUT
SHUT OUT
HIGH RELIABILITY
Decrease of bearing
load
Minimizing of shaft
swing
Oil returning pipe
Decrease of superheat loss
Decrease of leak loss
Decrease of intake loss
HIGH PERFORMANCE