Airedale TurboChill FreeCool 200kW - 1830kW - Manual (Page 23)

23 Chiller Technical Manual 7525355 V1.1.0_04_2013
Introduction
Chillers TurboChill™ Air Cooled and FreeCool
The in built 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.
Energy saving Electronically Commutated (EC)
Fan Motor
Each 800 mm diameter fan incorporates on board
electronics with AC / DC conversion and inverter driven
DC motor control to offer unparalleled high efficiency levels
combined with smooth step-less speed control and quiet
operation.
Sickle blades reduce air turbulence to minimise sound
levels and power consumption whilst maximising
performance.
The long bell mouth design provides improved
aerodynamics, up to 10% more air movement, and an
extended vertical throw of air to reduce the chance of air
re-circulation. As standard the enclosure is complete with
an integral finger proof grille.
The fans offer maximum airflow performance while keeping
sound levels to a minimum.
A mains EMC filter is fitted when the EC fan option is
selected with the unit. The filter is designed for convenient
mains connection within the bus bar chamber.
Fan speed of 60%
Voltage regulated input power required 60%
EC input power required 18%
EC (Electronically Commutated) Fan Speed Control
Voltage Regulated Fan Speed Control
0
20
40
60
80
100
120
0 20 40 60 80 100 120
Fan Speed %
Input Power %