Technical Description - Lennox NEOSYS NAC 200 Application Manual

TECHNICAL DESCRIPTION

GENERAL CHARACTERISTICS OF THE UNIT
The NEOSYS unit is designed to be integrated into urban or
residential environments.
As main characteristics the NEOSYS unit offers state of the
art design to match architectural constraints and adjustable
sound level performances during day and night to satisfy local
environmental constraints.
CASING/CHASSIS
- Casing made of galvanised steel sheet metal painted with a white
powdered polyester paint and a red stripe.
- Fully grey colour painted chassis protecting against corrosion.
- State of the art design with hidden compressors, fans and pump
for perfect architectural integration.
- Flat top, aesthetic grilles, very low unit height (2 meters) for
discrete installation on a roof reducing the requirement of costly
cladding solutions around the unit
- Aesthetic side anti-intrusion grilles as standard to protect the
unit during transportation and against human aggressions.
COMPRESSOR
- Exclusive Compliant Scroll® design with both axial and radial
compliance to increase compressor operation tolerance to liquid
refrigerant, substantially improving durability and reliability. 3-year
warranty*.
- Motor cooled by suction gas.
- Electronic control of the compressor discharge temperature.
- Motor protection device against high temperature or over current
situations.
- Discharge non-return valve.
- Low noise scroll compressors mounted in a sound-proofed technical
cabinet to reduce noise emissions.
- Compressors assembly installed on an independent chassis
supported by anti-vibration mountings.
WATER HEAT EXCHANGER
- True dual circuit plate heat exchanger
- Copper brazed Stainless steel plate heat exchanger.
- 13 mm thermal insulation foam.
- Water heat exchanger located in a technical cabinet protecting
the insulation against climatic conditions (UV light, rain).
3-year warranty*
* Warranty under conditions - See page 3
• 6 •
AIR HEAT EXCHANGER
- High effi ciency aluminium Micro Channel heat exchangers (MCHX)
with improved corrosion resistance in moderate marine or urban
environment (cooling only version). 3-year warranty*.
- Standard copper tubes/aluminium fi ns heat exchanger (heat pump
version).
- V-coil design to protect the unit against climatic conditions (e.g.
hail).
FANS
- Inverter fans (0 to 900 rpm operating range).
- Active Acoustic Attenuation System™ to meet changing building
load requirements while automatically adjusting the air fl ow to
respect night and day sound level constraints (adjustable setting
over time schedule with 4 time zones per day).
- Elimination of intrusive start/stop noise that is irritating to the
human ear.
- Fan-motor assembly using external rotor technology associated
with owlet high performance aluminium fan blades of the latest
generation.
- IP 54 electrical motor, class F protected against high temperature
with an internal sensor.
- Exclusive fan design with hybrid Ceramic bearings to extend the
service life of motors and to reduce noise level. With these sealed
hybrid ceramic bearings, our customer can expect little or no
maintenance of the motor throughout its life. 3-year warranty*.
- Extremely rigid fan assembly via the integration of the fans mounted
within a pre-formed bell mouth roof panel, thus improving rigidity
while reducing vibrations.
- Rounded top acoterion panels to hide the fans and reduce noise
emissions for quieter operation.
REFRIGERANT CIRCUIT
NEOSYS uses R410A refrigerant in 2 independent circuits
(minimum). Each circuit includes:
- A refrigerant charge reduced by 30% due to the use of R410A
combined with micro channel heat exchanger (NAC/Cooling only
version).
- Suction piping with thermal insulation.
- Filter drier with removable cartridge fi lter.
- Thermostatic or electronic expansion valve (Electronic device only
when "winter operation" option selected).
- Temperature sensors and pressure transducers.
- Four-way valve and liquid receiver (heat pump units only).
- Leak-tight refrigerant circuit with brazing carried out under nitrogen
by certifi ed engineers.
- Each refrigerant circuit is pressure and leak tested with a Hydrogen/
Nitrogen mixture, and vacuumed before being charged with
refrigerant. All units are then subjected to a complete functional
and operational run test to guarantee perfect sealing before
leaving the factory.
Application Guide / NEOSYS-AGU-1801-E