NRL NRL - Welcome to the NRL Sales Training Program The following presentation will provide information on Aermec’s new air to water heat pump

NRL Range Available Cooling only Heating and cooling mode Free cooling High efficiency EER 9.55 cooling only COP up to 3.03 in W/W heating mode Refrigerant: R410A Heating Capacity: 166.000 – 3.400.000 BTU/h Cooling Capacity: 13-262 ton

NRL Range Working Limits: Heating / Cooling A5F/W104F - A32F/W131F 17 units with power supply 208/3/60 17 units with power supply 230/3/60 24 units with power supply 460/3/60 24 units with power supply 575/3/60 Standards comply with: ARI 550 UL ETL Max water out 131˚F Heating Min water out 21˚F Cooling

NRL Range NRL 280-1800 Cooling only Cooling: 13.7T (48,2kW) to 130T (456kW) 208-230-460-575/3/60 NRL 280-1800 Heating and Cooling Cooling: 13T to 130T 208-230-460-575/3/60 Heating: 13.8T to 135T 208-230-460-575/3/60 NRL 2000-3600 Cooling only Cooling: 145T to 261T 460/3/60; 575/3/60 NRL 2000-3600 Heating and Cooling Cooling: 140 T to 212T 460/3/60; 575/3/60 Heating: 145T to 225T 460/3/60; 575/3/60

NRL Chillers and Freecooling 6/25/2009 6/25/2009 6/25/2009 6/25/2009 6/25/2009 NRL Chillers and Freecooling 13 Through 260 Tons Chiller or Heat Pump Free Cooling Chiller 100 % Heat Recovery 40 % Heat Recovery ETL certified AHRI certified 5 ‹#› ‹#› ‹#› ‹#›

Hydronic Option Evaporator Air vent valve Water filter Flow switch 6/25/2009 Hydronic Option Evaporator Air vent valve Water filter Flow switch

The Aermec Advantage: Self contained units 6/25/2009 6/25/2009 6/25/2009 6/25/2009 6/25/2009 Advantages The Aermec Advantage: Self contained units 4 ‹#› ‹#› ‹#› ‹#›

Hydraulic Options Hydronic KIT: 00 – Without 6/25/2009 Hydraulic Options Hydronic KIT: 00 – Without 01 – Tank and low head pump 02 – Tanks and low head pump and standby pump 03 - Tank and high head pump 04 - Tanks and high head pump and standby pump P1 – Pump low head P2 – Low head pump and standby pump P3 – Pump high head P4 - Pump and high head pump and standby pump NRL Multiscroll with R410A

NRL Multiscroll with R410A Hydraulic Options NRL Multiscroll with R410A

Capacity Control

Redundancy NRL Multiscroll with R410A

NRL Multiscroll with R410A Chiller NRL Multiscroll with R410A

Desuperheater

Total Heat Recovery

Defrosting Heat Pumps Aermec declares all defrost penalties in our certifications as it is a requirement in Europe. Competitors in North America do not as there the air to water heat pumps sold here are actually only certified as chillers This chart shows the penalty that is paid between the temperatures of 31˚F 38˚F or the defrost zone. As you can see there would be a fair difference in efficiencies of units that do not declare defrost NRL Defrost We must reach a low pressure minimum value to enter into possible defrost mode. Only when the low pressure is below 61 PSI can we possibly go into defrost. If the pressure is above 61 PSI we have no chance of needing defrost. Only after the pressure drops below 61 PSI for more than 10 minutes will we enter on possible defrost situation. If we reach these two conditions we can have a defrost minimum every 30 minutes according to this parameter. The logic states that after 5 minutes of compressor operation we read the low pressure and write it to memory inside the controller, this becomes fixed value A. After that if the low pressure drops more than 8.7 PSI below the fixed value A, we can have defrost. The defrost is accomplished by reversing the cycle. The t t sbr parameter is the delay time between two defrosts which is 1800 seconds. So after the NRL has started and the compressor has run for 30 minutes, we read the low pressure and this is our value. When the pressure drops down more than this differential, 8.7 PSI the defrost is started as long as we have had a minimum of 30 minutes since the last defrost. When the defrost is called for we stop the compressor we reverse the four way valve and start the cooling mode while stopping the fan. We stop the defrost by time or temperature, with the minimum time being one and one half minutes and the maximum time being 6 minutes. So we can stop the defrost by the maximum time or when the liquid sensor on the liquid line before the expansion valve reads 20 degrees C or 68 F. When we have tandem or 3 compressors every time that one compressor starts or stops we automatically recalculate the delta p. There is a parameter inside the reading menu where you can see the exact delta p. This allows you to see how many PSI of pressure drop we have to wait to enable the defrost. If you go into the menu through the display there is a parameter that is reading the countdown of low pressure drops (it must be zero to authorize the defrost). We must also consider the unit has two circuits. The first circuit that arrives at 8.7 PSI below the fixed value calls the defrost but we have only one fan group so when the first circuit calls for defrost it automatically stops the second circuit. When we have two circuits that are running and the first circuit or number one calls the defrost, we stop the compressor on the second circuit. We perform the defrost on the first circuit and then both circuits come back up in heating mode. This is due to having only one fan group. When we have two fan groups in the larger heat pumps they work independently. A circuit is able to start and stop its own defrost. For the smaller models where we have only one fan group it is necessary to stop the second circuit to defrost one circuit. If you want to accelerate the defrost you can adjust the parameter if you have a unique installation, different working conditions, and area where the humidity is very, very high and the temperature becomes very low to have a fast defrost because otherwise if the low pressure never drops down, it will never defrost, it cannot defrost. This is only through reversing valve, no injection. The defrost is also called if after 30 minutes of compressor run time (times=0) but the delta low pressure is not reached and the LP is < 58 PSI (extreme working condition) The 30 minutes are cumulative so if during the functioning compressors are stopped we will consider the 30 min like real working time. When compressor is stopped (it reached set point) at the next start up it must operate a minimum 10 minutes before it is able to enter defrost, of course if all conditions are satisfied. The advantage of this system is that is auto adaptable at all working conditions and defrost is called only when the heat pump is losing significant performance.

How is Freecooling Made?

NRL Freecooling Air-to-water coil Ordinary chiller 3-way valve 6/25/2009 NRL Freecooling Air-to-water coil Ordinary chiller 3-way valve

NRL Free Cooling NRL Freecooling 6/25/2009 NRL Freecooling Free Cooling Example: 45°F supply water with a ΔT of 10°F which provides for a 55°F return water temperature. Chiller operates as a standard chiller as long as the outdoor ambient air temperature is 52°F or above. When the outdoor ambient drops to 51°F or 4°F below outdoor ambient the factory installed 3 way valve opens and directs the water to the optional free cooling water coils.

NRL Free Cooling NRL Freecooling At the same time 6/25/2009 NRL Freecooling At the same time the fans go to high speed. The water gives up some of its heat through these water coils and then goes through the refrigerant to water heat exchanger where it is cooled to the desired temperature. We have some free cooling along with mechanical cooling at this point. As the outdoor ambient continues to drop we gain more free cooling and use less mechanical cooling. The chiller will automatically start shutting off compressors as they the temperature drops and they are not required. Eventually when the temperature drops low enough the mechanical cooling is not needed at all and we are using entirely free cooling.

NRL Freecooling The exact temperature that we 6/25/2009 NRL Freecooling The exact temperature that we reach 100% free cooling at depends on the return water temperature but in this example we would each 100% free cooling at approximately 29°F. The savings are tremendous and this unique free cooling system is real advantage. The system is fully automated. In applications where the chilled water temperature required is higher e.g.: 55°F so the return water is 65°F free cooling would start at 61°F providing even greater savings.

Performance: E.E.R. Highlights The graph shows what happens to the E.E.R. during one hypothetical year, assuming the water temperature is constant at 44.5˚F, at different external air temperatures You will notice the rapid increase of the E.E.R. when the compressors stop (i.e. 4 compressor refrigerant unit)

NRL Freecooling: Multichiller 6/25/2009 NRL Freecooling: Multichiller Dualchiller: Simplified control system to switch on and off, and command, two chillers (using Aermec GR3 command) in a single system, as if they area single units

NRL Freecooling: Multichiller 6/25/2009 NRL Freecooling: Multichiller Multichiller: Control system to switch the individual chillers on and off, and command them, in a system in which up to 9 units are installed in parallel, always ensuring a constant delivery to the evaporators

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