Reversible units, air source
NX-N  0604T÷1204T

Unit description

Outdoor reversible unit for the production of chilled/hot water with hermetic rotary Scroll compressors, ozone-friendly refrigerant R410A, axial-flow fans, copper tubes aluminum fins air coils, shell and tubes heat exchanger, and thermostatic or electronic expansion valve, according to the model. External panels in pre-clad sheet steel and base in galvanised steel with paint finish. The range is composed by units equipped with four compressors in tandem configuration on two independent refrigerant circuits.

Versions

CA - Class A of efficiency
K - Key efficiency, compact version
LN-CA - Low Noise, Class A of efficiency
LN-K - Key efficiency, compact and low-noise version
SL-CA - Super Low noise version, Class A of efficiency
SL-K - Key efficiency, compact and super low-noise version

Configurations

NX-N / -
base function
NX-N / D
partial condensing heat recovery function

Features

REFRIGERANT GAS R410A
The use of R410A has resulted in units offering better energy efficiency in full respect for the environment (ODP = 0)
ELECTRONIC EXPANSION VALVE SUPPLIED STANDARD
The use of the electronic expansion valve generates considerable benefits, especially in cases of variable demand and different external conditions. It has been introduced into these units as a result of accurate design choices concerning the cooling circuit and the optimisation of operation in various different working conditions. The electronic expansion valve comes standard in the high-efficieny CA version, optional for the compact K versios.
‘CLASS A’ EFFICIENCY
The full range is also available with the Class A efficiency rating. NX/CA guaranties within all the noise configurations premium levels of efficiency thanks to the generous sizing of the refrigerant-exchange surface areas and to an accurate control of the fans.
SHELL AND TUBES EXCHANGER
The shell and tube exchanger allows to achieve the highest flexibility on the unit’s installation, keeping on the hydronic side the pressure drops at the minimum level, thus representing the best choice for all the hydronic applications on the residential, commercial and industrial markets.
INTEGRATED HYDRONIC MODULE
The incorporated hydronic unit already contains the main water circuit components; it is available in various configurations with one or two pumps with high or low head and the buffer tank

Commands

W3000 Base / W3000SE Compact
The controller can be chosen as: - W3000 Base: keypad and LED display - W3000SE Compact: the keypad features an easy-to-use interface and a complete LCD display, allowing to consult and intervene on the unit by means of a multi-level menu, with selectable language setting. The diagnostics includes a complete alarm management, with the "black-box" and alarm logging functions for enhanced analysis of the unit operation. Compatibility with the remote keyboard managing up to 10 units. Availability of an internal real time clock for operation scheduling (4-day profiles with 10 hour belts). Common features: The regulation is based on the exclusive QuickMind algorithm, including self-adaptive control logics, beneficial in low water content systems. As alternatives the proportional- or proportional-integral regulations are also available. For multiple units’ systems, the regulation of the resources, via optional proprietary devices, can be implemented. Energy metering, for both consumption and capacity, can also be developed. Supervision can be easily developed via proprietary devices or the integration in third party systems by means of the most common protocols as ModBus, Bacnet, Bacnet-over-IP, Echelon LonWorks. The defrost adopts a proprietary self-adaptive logic, which features the monitoring of numerous operational parameters. This allows to reduce the number and duration of the defrost cycles, with a benefit for the overall energy efficiency.

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