• 8 •
1
3
4
2
- 25%
1
40 %
2
18 %
3
12 %
4
30 %
Application Guide / FLEXAIR-AGU-1505-E
Fan absorbed power with variable airfl ow rate
Fan absorbed power
(% of nominal)
Airfl ow rate
(% of nominal)
1.6- EC FANS IN SUPPLY AND EXTRACTION
Annual compressor consumption
Annual consumption of other electical systems
Remaining annual fan motor consumption
Energy savings thanks to eDRIVE
EC fan technology offers the maximum effi ciency together with
the minimum power consumption. That’s why FLEXAIR provides
EC fans both in indoor and exhaust section.
FLEXAIR will adapt the fan pressure to the different conditions
of the unit, and will provide high pressure available in the duct
even when all the options have been selected.
The EC plug-fan technology allows:
- Adapting airfl ow at commissioning
- Varying airfl ow during unit operation providing progressive
infl ation of smooth /textile ductworks
- Easy maintenance operations, as there is not pulleys and
belts regulation
eClimatic profi ts about this EC technology by:
- Monitoring the airfl ow in the service terminal
- Compensating the airfl ow if the fi lters are dirty
- Regulating the airfl ow to arrive to the desired set point tem-
perature.
Optimize the air-fl ow to the load demand (reduce consumption
when possible)
Condensing section mounted in a rigid base frame to ensure
good support for compressors and giving rigidity to the complete
structure.
eDRIVE
VENTILATION
eDRIVE is a standard feature
of Lennox FLEXAIR units
for ventilation with direct
transmission, variable speed
drives that saves energy and
reduces maintenance costs.
SAVING ENERGY WITH eDRIVE VARIABLE
SPEED, DIRECT DRIVE FAN.
With a rooftop, the blower fan motor is one of the major contributors
to annual energy consumption. Fans usually run 97% of the year
at full speed to circulate the air inside the building. 42% of the
annual energy consumption of an air conditioner is due to the
fan motor, which can be more than compressors.
VARIABLE SPEED DRIVE
Airfl ow reduction during part load operation and dead zone can
help save on energy consumption.
There is no need to reduce airfl ow rate too much to achieve
important energy savings: For example reducing airfl ow rate by
only 25% will save 60% on the fan motor energy usage.
• FLEXAIR integrates the new eDRIVE which automatically
adjust airfl ow rate to the needs, saving up to 30% annual
rooftop energy consumption.
• Airfl ow Rate can be easily adjusted to the exact needs, thanks
to eFlow the airfl ow measurement and display system.
• eDRIVE will correct power factor to reduce current.
• eDRIVE integrates soft starter feature as standard, that will
reduce inrush current during fan starts and makes the unit
fully compatible with fl exible ducts air diffusion systems.
1- GENERAL DESCRIPTION
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