NRK Section 1 NRK Features NRK Air to

NRK

Section 1: NRK Features

NRK • Air to water heat pump • Optimized in heat pump mode • Circuit with economizer • NRK is a heat pump designed for systems which require high water temperatures in heating and also provides cooling

NRK Features Flow switch as standard supply Axial fans for quiet operation Air to water Anti-freeze electric heater for the evaporator and electric heater for the base Units fitted as standard with fan speed controller (DCPX) Low and high pressure transducers High efficiency scroll compressors

NRK Features • High efficiency scroll compressors with low power input and injection gas • Single or redundant pumps • Can be ordered with tank and pump or single pump (both high and low pressure) • Fans are equipped with inverter technology for fan speed control and an optional low noise version • Equipped with an Enhanced Vapor Injection compressor (EVI) • Available with high static fans

NRK Features • Operational Limits • Maximum external air temperature is 118. 4˚F in cooling mode • Maximum external air temperature is 108˚F in heating mode • Maximum leaving water temperature is 149˚F in heating mode • Operates to -4 ˚F in heating mode

NRK Features

NRK Microprocessor Controls • Microprocessor Controls: • Control from the leaving water temperature, with the possibility of selecting control of entering water temperature • Condensing control in summer with a 0 -10 V modulating signal based on pressure and compensated for external air temperature • Automatic rotation of compressors • Load limiting safety controls

NRK Characteristics Two refrigerant circuits R 410 A From 12 Tons to 49. 8 Tons Refrigerant Circuits Heating Capacity Cooling Capacity From 10. 2 Tons to 41. 2 Tons

NRK Refrigerant Circuit Diagram

NRK Refrigerant Circuit Explanation • The NRK features a refrigerant control system that is capable of improving the operating range of the chiller / heat pump in heating or cooling modes, which leads to energy efficiency and more reliable operation • The control system allows a mixture of liquid and cool refrigerant gas to enter the compressor part way through the compression cycle to increase the refrigerant mass flow rate of the compressor and cools the: • Compression cavity walls • Scroll blades • High pressure valves • Check valves upper bearing assembly

NRK Refrigerant Circuit Explanation • • The liquid / cool gas injection control system includes: • A hot gas temperature sensor (HGTS) • A liquid solenoid valve • A thermostatic expansion valve • An economizer (heat exchanger) – it allows the cool wet / gas mixture entering the compressor to begin to evaporate prior to entering the compressor At 275˚F the hot gas sensor allows the VS 1 solenoid valve to energize and allows high pressure minimally sub-cooled liquid to pass through a heat exchanger where it evaporates picking up heat and then passing into the compressor

NRK Refrigerant Circuit Explanation • As the refrigerant enters the compressor, the walls of the compressor compression captivity are cooled along with the scroll blades, discharge and check valves • The refrigerant gas and oil being moved through the compressor are cooled as well without any change in condensing pressure • The slightly increased refrigerant flows through the compressor and helps to stabilize the condensing pressure, leaving the compressor, as well as cool down the mixture of gas and oil below the temperature at which the oil will begin to breakdown

NRK Refrigerant Circuit Explanation • At the same time as the refrigerant gas is picking up heat on one side of the economizer/evaporator heat exchanger the liquid entering the main chiller heat exchanger / evaporators is additionally sub-cooled increasing the system refrigeration effect • This change in the temperature of the discharge gas improves the operating range of the system for heating hot water • Hot water required for heating the facility can be raised from 131˚F to 149˚F while at the same time taking advantage of the environmental benefits of using R 410 A • The outdoor operating range has been now extended to 4˚F

NRK Injection Line • The driver check alternative two function mode: • Control of the superheating of the injection gas temperature (5) [vapor injection] • Control of the discharge temperature (2) [wet injection]

NRK Why the Economizer? • The economizer allows an increase in efficiency of thermodynamic cycle especially for high compression ratios • The use economizer can decrease the reduction of thermal power due to outside temperature decreases example : from Ambient 44. 6°F Water 113°F to A-10 W 45: • • • NRL H decreases heating capacity 42% NRK: decreases heating capacity 27% When we have to design a unit at very low ambient temperature the NRK could allow you to take one or two size smaller compare NRL HA

NRK p. CO 5 Control Board • • • New control board p. CO 5 Advantages compare GR 3: - Hourly program - Remote graphic display - Multi function inlet - Alarm history with storable parameters - USB inlet to update l software New function : Night silence mode

Section 2: Competitor Comparison

NRK Comparison COP NRK vs. NRL HA T amb 7°C; Tw 40°C- 45°C T amb -10°C; Tw 40 C°-45°C T amb 7°C; Tw 50°C -55°C

NRK Competitor Comparison • At the moment AERMEC is the only one that proposes this product • In the database Eurovent there aren’t similar product in R 410 A with injection gas • The bigger competitors have unit in R 407 C optimized in heat pump mode CLIMAVENETA AWR-HT CARRIER 61 AF CLIVET WBAN VULCAN 9. 6 RT- 33. 5 RT 5. 9 RT – 14. 8 RT 32. 9 RT– 51. 4 RT 18. 9 RT - 29 RT 8. 4 RT– 28. 2 RT

NRK Competitor Comparison Classe A Classe B Classe E Classe D Classe C Classe B Classe A

NRK Competitor Comparison

NRK Competitor Comparison Database Eurovent; Condizioni Ta 7°C Tw 40°-45° Database Eurovent; Condizioni Ta 35°C Tw 12°-7°

Section 3: NRK Dimensions & Technical Data

NRK 200 Model Dimensions Height 63. 2 inches Length 106. 2 inches Width 43. 3 inches

NRK Dimensions

NRK Technical Data

NRK Internal Structure 4 way valves Axial fans Two refigerant circuits Economizer Liquid receiver Injection line

Section 4: NRK Accessories

Accessories Accessory Explanation AER 485 P 1 RS 485 interface for supervising systems with Bacnet MODBUS Lon protocol PGD 1 Simplified remote panel and allows control of basic unit functions and alarm notifications MULTICHILLER_PC O Control system to switch the individual chillers on and off, and command them, in a system in which several units are installed in parallel, this ensures constant delivery to the evaporators GP Protection grill that protects the external coil from accidental damage VT Anti-vibration mounts to be installed under the base of the unit

AERWEB Accessories Accessory Explanation AERWEB 300 The AERWEB option allows remote control of a chiller through a standard PC and Ethernet connection with a standard browser AERWEB 300 -6 Web server to monitor and remote control maximum 6 units on RS 485 network AERWEB 300 -18 Web server to monitor and remote control maximum 18 units on RS 485 network AERWEB 300 -6 G Web server to monitor and remote control maximum 6 units on RS 485 network with integrated GPRS modem AERWEB 300 -18 G Web server to monitor and remote control maximum 18 units on RS 485 network with integrated GPRS modem

Factory Fitted Accessories Accessory Explanation DRE Electronic soft starter which reduces starting current by about 26% RIF Power factor correction that is connected in parallel to the motor and allows about 10% reduction of the input current PRM 1 It is a manual pressure switch electrically wired in series with the existing automatic high pressure switch on the compressor discharge pipe

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