NRL Free Cooling Air to Water Chillers 13 tons-260 tons


Technical Data 

  • High Efficiency Version
  • Silenced High Efficiency Version
  • Version with Circulation Pump
  • 2 Cooling Circuits
  • Version with Circulation Pump and Storage Tank


  • Available in 10 different sizes
  • Refrigerant R410A
  • 2 cooling circuits
  • High efficiency even with partial loads
  • Heat exchangers optimized to exploit the excellent heat transfer characteristics of the R410A
  • High-efficiency scroll compressors
  • Axial flow fans with reduced noise level
  • Solid construction with polyester anti-corrosion painted finish
  • Cooling mode up to 115°F
  • Operation modes:
    - Free-cooling only: is the most economical way to use the unit. Only the fans operate in modulation of speed, the
      cooling power is fully recovered from the external air.
    - Mixed free cooling and compressors: the cooling power recovered from the external air is integrated with the total or
      partial operation of the compressors.
    - Compressors only the cooling capacity is provided entirely by the compressors (standard operation of a chiller)
  • Versions available:
    - High efficiency
    - Silenced high efficiency
    - Glycole-free
    - With pumping assembly (high-head, with/without reverse pump)
  • Versions with pumping assembly and 92 Gallon tank (132 Gallon for the 750 size), complete with filter, flow switch, expansion tank, a charging unit and antifreeze electric heater.
    - Electronic thermostat valve
    - Enlarged fans
  • Microprocessor control system of the compressors and fans for the management of the three operating modes (Free-Cooling only, mixed Free-Cooling and compressors and compressors only)
  • Display of all operating parameters in 4 languages
  • Simplified remote control panel with shielded cable up to 164 ft. Performs the basic checks of the unit with alarm warnings.
  • Three-way valve located on the water side for water switch-over on the Free-Cooling coils
  • High and low pressure transducers (standard on all versions)
  • Fan speed adjustment device for low air temperature operation. Manages the cooling capacity in the Free-Cooling mode.


  • AER485P1: RS-485 interface for supervision systems with MODBUS protocol.
  • VT: Anti-vibration support, to be fitted below the sheet metal base of the unit.
  • DRE: Current soft starter device (about 30% reduction for single-circuit-units, 26% for two-circuit-units, 22% for three-circuit-units) Only available for 3-phase power supply. It must be factory set.
  • GP: Protection grille, protects the external coil from accidental knocks.
  • RIF: Capacitor device. Connected in parallel to the motor winding. It allows to maintain a constant COS? at 0.95 and also allows an input current reduction (about 10%). It must be factory set when the unit is manufactured.
  • AERWEB300: The AERWEB device allows remote control of a chiller via a serial link from a standard PC. Using additional modules, the device allows to control the chiller via the telephone network, using the AERMODEM accessory; or via the Gsm network, using the AERMODEMGSM accessory. AERWEB can pilot up to 9 chillers, but each of these must be equipped with the AER485 or AER485P2 accessory.
  • DUALCHILLER; Simplified control system to switch on and off, and command, two chillers (using Aermec GR3 command) in a single system, as if they were a single unit.
  • MUTLICHILLER: Control system to switch the individual chillers on and off, and command them, in a system in which several units are installed in parallel, always ensuring a constant delivery to the evaporators.
  • PRM1-PRM2: FACTORY FITTED ACCESSORY. It is a pressure switch electrically wired in series with the existing automatic high pressure switch on the compressor discharge pipe.


Code: NRL

Size: 028, 030, 033, 035, 050, 055, 060, 065, 070, 075

Compressor: 0 - Compressor standard ad R410A

Thermostatic valve:
° - Standard mechanical thermostatic valve
Y - Mechanical thermostatic valve with processed water from 39°F down to 21°F
X - Electronic thermostatic valve also with processed water down to 21°F

F - Free- cooling
B - Free-cooling glycol free

Heat recovery units:
° - Without recovery units

D - Desuperheater

A - High efficiency
E - High efficiency, silenced version

° - Aluminum
R - Copper
S - Tinned copper
V - In painted aluminum (epoxy paint)

° - Inverter

Power supply:
6 - 460V/3N/60Hz with thermomagnetic switches
7 - 230V/3/60Hz with thermosmagnetic switches
8 - 575V/3/60Hz with thermosmagnetic switches
(contact the company head office for versions with DCPX)

Hydronic Kit: (options listed are available only for models "F" Free cooling)
00 - without storage tank
03 - high-head storage tank and single pump
04 - high-head storage tank and reverse pump
P3 - without storage tank, with high-head pump
P4 - without storage tank, with high-head pump and reverse pump

- the standard options are shown by the symbol °;
Example of the commercial code: NRL0350°F°A°°°00
This is a size 035 NRL unit with standard mechanical thermostatic valve, Free-cooling model, high efficiency, with aluminum condensing coils, standard fans, electrical panel for compressors with 460V 3N - 60Hz motors and without storage tank.