Airedale BluCube 10-48kW - Manual (Page 12)

BluCube
™
Condensing Unit
12
Condensing Units
Technical Manual : 7206188 V1.6.0_07 2014
Electronically Commutated
(EC) Fan Motor Backward curved impellers, direct drive fan assemblies with integral hub mounted
motor which is statically and dynamically balanced for quiet operation.
Designed for high corrosion resistance, the impellers are laser welded aluminium with
a galvanised rotor and die cast aluminium EC power module.
EC motors incorporate integrated electronics to convert AC power to DC for efficient
and accurate speed control and are adjustable via the microprocessor display keypad.
The fans offer maximum air flow performance while keeping sound levels to
a minimum.
It 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%, standard AC fans
modulating range is typically 40 -100% of full fan speed.
Standard voltage regulated (VR) fan speed controllers offer a linear response.
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
(VR) Fan Speed
Control
Fan Speed %
Example: Fan speed of 60%
VR input power required 60%
EC input power required 18%
Short Case Axial Fans SCAF fans are available for the 092 models only. They can achieve a external static
pressure of 75Pa.