Edrive - Lennox NEOSYS NAC 200 Application Manual

HYDRAULIC EQUIPMENT
eDrive™ TECHNOLOGY, THE RIGHT CHOICE TO SAVE 75% OF PUMP ENERGY COSTS.
LENNOX offers the eDrive, a variable speed drive pump option (with single or double pump) which modulates the water fl ow through
the evaporator and reduces energy costs. This option is available on chillers and heat pumps from 20 to 1000 kW.
In a water system, one major contributor to annual energy consumption is the pump motor. Pumping energy cost can represent 20%
of the total cost of owning a chiller. This ratio can be even bigger for a heat-pump.
eDrive™ variable speed driven pump is contributing to continuous Lennox efforts to save energy while exploring possibilities
to reduce installation cost.
eDrive™ variable speed driven pump benefi ts:
• Cost savings on the energy consumption especially at part-load conditions and during off period.
75% of this energy could be saved !
• Cost savings on the initial system cost. Fewer pumps and piping connections than primary–secondary systems, terminal units
equipped with two-way control valves instead of three-way valves, elimination of water fl ow set valve.
• Flexibility and accuracy in the pump operation control (smooth start and stop, gradual change of speed, accuracy and stability of
control)
• Reduction of the repeated stress on the pump and piping resulting in longer equipment life time (elimination of the «hammer blow»
in pipes).
• Elimination of the start-up current thanks to variable frenquency drive that controls a gradual pump motor supply.
Designing a VWF chilled water plant that performs reliably at all load conditions requires careful attention to chiller design. Thanks
to the newest generation of chiller controllers and intensive testing, NEOSYS can now reliably maintain the desired chilled water
temperature with a fl ow range from 60% to 100% that gives up to 75% annual energy savings.
LENNOX eDrive™ Technology modulates the Water Flow especially in Part-Load Conditions through a Specifi c Algorithm and a
Variable Frequency Driver.
Chiller with fixed speed pump
10 %
20 %
Cooling energy cost
Equipment cost
Application Guide /NEOSYS-AGU-1801-E
Typical cost split in a chiller through 15-year lifespan
Energy savings
22 %
47 %
Chiller with variable speed pump
10 %
15 %
5 %
Maintenance cost
Pump energy cost
23 %
47 %
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