Airedale DeltaChill FreeCool 110kW - 1080kW - Manual (Page 21)

Chillers DeltaChill™ Air Cooled and FreeCool
21 Chiller Technical Manual 7267818 V1.4.0_04_2014
Introduction
Condenser Fan and Motor - AC
Axial fan assemblies with finger proof grille and incorporating external rotor AC motor technology, capable of highly
accurate discreet speed control., Discharges air vertically. The fans offer maximum performance whilst keeping sound
levels to a minimum.
Condenser Fans
High Airflow EC Fans
Additional free cooling is available when a high air volume
EC Fan is selected.
This option is only available with the Free cool chiller.
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.
0
20
40
60
80
100
120
0 20 40 60 80 100 120
Fan Speed %
Input Power %
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 design 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
Optional Features