Airedale DeltaChill FreeCool 110kW - 1080kW - Manual (Page 19)

Chillers DELTACHILL
™
Chillers
19
Technical Manual :7022932_V1.9_11/2013
Design Features & Information
Energy Saving Features
Electronically
Commutated (EC) Fan
Motor EC motors are DC motors with integrated AC to DC conversion; this gives the
flexibility of connecting to ac mains with the efficiency and simple speed control
of a DC motor. The EC fan offers significant power reduction in comparison with
equivalent AC fan at both full and modulated fan speeds. The inbuilt EC fan
control module allows for fan speed modulation from 15-100%, a standard AC
fans modulating range is typically 40-100% of full fan speed.
The EC fan presents superior energy efficiency at full and reduced fan speed
compared to the equivalent AC fan motor, offering efficiency savings anywhere
between 30 to 100% compared with an AC fan.
Fan speeds are factory set depending on sound level variant.
Standard voltage regulated (VR) fan speed controllers offer a linear response.
By comparison the EC fan is adjusted on demand via the unit microprocessor
with precision, offering substantial energy savings. The following illustration
shows a comparison of the typical power input required by each method.
In
pu
t Po
w
e
r %
0
20
40
60
80
100
120
0 20 40 60 80 100 120
Key
EC (Electronically
Commutated) Fan
Speed Control
Voltage Regulated
Fan Speed Control
Fan Speed %
Example: Fan speed of 60%
Voltage regulated input power required 60%
EC input power required 18%
EMC Mains Filter A mains EMC filter is fitted when the EC fan option is selected with the unit. The
filter is design for convenient mains connection within the busbar chamber.