INISINIA
TAEAO
Variable speed compressors
NVK35FSC, NVS50FSC, NVS70FSC
with controller N206 series
R290
Ta'iala mo talosaga
www.danfoss.com
Compressor Overview
Why Variable speed?
Variable Speed offers the lowest energy consumption for applications by electronically self-adjusting the compressor’s speed to meet the cooling needs of the appliance, while improving the Coefficient of Performance (COP) by up to 40%.
Commercial refrigeration manufacturers are focusing their efforts on producing more efficient applications to satisfy the demand for reduced operating costs of refrigeration equipment installed in supermarkets, retail premises, and restaurants, where energy savings have become a major concern.
The accurate design of the application and the proper selection of components—such as efficient compressors, fan motors, increased insulation thickness of cabinet walls, larger condensers, and low-consumption lighting—are key to reducing the total energy consumption of the application. The compressor is one of the components with the highest impact in terms of energy consumption in an appliance.
Variable Speed Compressors are the solution for obtaining maximum energy reduction, primarily because full compressor capacity is not always needed. This technology dynamically adapts the compressor’s cooling capacity to the appliance’s needs by adopting electronically controlled running speed, optimizing the system’s performance.
The benefits obtained by using Variable Speed Compressors include:
- The ability to cover several standard compressor models of different cabinet volumes with just one compressor model.
- Reduction in compressor power consumption by up to 45% to 50% compared to standard compressors. This energy saving can be over 40% when considering the total appliance power consumption (attributable solely to the compressor).
- Reduction in pull-down time by operating at a higher speed when needed.
- Reduction in the number of start-ups/stops of the compressor.
- Medication of speed to achieve the longest possible duty cycle.
- Lower noise levels.
- Longer expected compressor life due to the compressor typically running at a lower speed than standard compressors.
- Drop-in electronic driver system for automatically self-adapting the compressor speed to the current thermal load.
- Compatibility with electromechanical and electronic thermostats.
| Fa'amatalaga | NVK35FSC | NVS50FSC | NVS70FSC |
| Puaisa | R290 | ||
| Oil type POE RL22H charge | 170 cm3 | ||
| Fa'alautele | capillary tube / expansion valve | ||
| Metotia malulu | Fan Cooling min 3 m/s | ||
| Fa'atatauga | LMBP | ||
| Evaporation temperature range | -40ºC to 0ºC. | ||
| Condensation temperature range | up to 60ºC (Pull-down peak: 70ºC). | ||
| Ambient temperature range – compressor / controller | 0 to 43ºC / -10ºC to 60ºC | ||
| Voltage range / frequency * | 90-140V / 50-60Hz or 160-264V / 50-60Hz | ||
| Ituaiga afi | PMSM | ||
| Malosiaga | ≥0.90 (PFC on) | ||
| Lisi a'a | <3.5mA | ||
| Va'aiga saoasaoa tau afi | 1600 – 4500 rpm | ||
| Malosiaga fa'aoga | 320W | 600W | 600W |
| Comp. displacement | 3.5 cm3 | 5 cm3 | 7 cm3 |
| Compressor weight + Electronic unit 0.51 kg | 6 kilokalama | 6.3 kilokalama | 6.3 kilokalama |
| Suction connector I.D. | 6.2 mm | ||
| Service connector I.D. | 6.2 mm | ||
| Discharge connector I.D. | 4.9 mm | ||
| Fa'amau vae | EU (16 mm holes) |
Compressor dimensional drawings
Compressor performances
Table 1: Cooling Capacity [W] ASHRAE
Tulaga o Su'ega
Condensing temperature 55 ºC
Liquid temperature 32 ºC
Suction temperature 32 ºC
Ambient temperature 32 ºC
teutusi galue
R290 LMBP
Avetaavale faaeletonika
The controller drives the compressor at various specic speeds to better match the cooling needs of the refrigeration appliance. There are different inverter types, depending on the power supply type and control signal, as shown in the table.
| Ituaiga Pule | Ituaiga Compressor | Fa'atatauga | Vave tele | Voltagu tele | Faiga polokalame |
| HY17111-E | NVK35FSC | LMBP | 1600 ÷ 4500 rpm | 160-264V 50/60Hz | Fa'atele |
| HY17111-BC | NVK35FSC | LMBP | 1600 ÷ 4500 rpm | 160-264V 50/60Hz | Tu'u i totonu |
| N206FR-B02 | NVK35FSC | LMBP | 1600 ÷ 4500 rpm | 90-140V 50/60Hz | Fa'atele |
| N206FR-C02 | NVK35FSC | LMBP | 1600 ÷ 4500 rpm | 90-140V 50/60Hz | Tu'u i totonu |
| N206FM-B04 | NVS50FSC/NMD50FSC | LMBP | 1600 ÷ 4500 rpm | 160-264V 50/60Hz | Fa'atele |
| N206FM-C04 | NVS50FSC/NMD50FSC | LMBP | 1600 ÷ 4500 rpm | 160-264V 50/60Hz | Tu'u i totonu |
| N206FR-B04 | NVS50FSC/NMD50FSC | LMBP | 1600 ÷ 4500 rpm | 90-140V 50/60Hz | Fa'atele |
| N206FR-C04 | NVS50FSC/NMD50FSC | LMBP | 1600 ÷ 4500 rpm | 90-140V 50/60Hz | Tu'u i totonu |
| N206FM-B05 | NVS70FSC/NMD70FSC | LMBP | 1600 ÷ 4500 rpm | 160-264V 50/60Hz | Fa'atele |
| N206FM-C05 | NVS70FSC/NMD70FSC | LMBP | 1600 ÷ 4500 rpm | 160-264V 50/60Hz | Tu'u i totonu |
| N206FR-B05 | NVS70FSC/NMD70FSC | LMBP | 1600 ÷ 4500 rpm | 90-140V 50/60Hz | Fa'atele |
| N206FR-C05 | NVS70FSC/NMD70FSC | LMBP | 1600 ÷ 4500 rpm | 90-140V 50/60Hz | Tu'u i totonu |
General rules and wiring connections
The NVK and NVS series must always be powered through the dedicated electronic controller, supplied with the compressor as a separate device.
- Never connect the compressor’s hermetic pins directly to an AC or DC source.
- Do not attempt to t an electronic driver different from the one supplied with the compressor, as the compressor will not operate and irreversible damage may occur.
- Do not remove the controller cover while powered on.
Fa'atonuga fa'amau
CN1: AC input
CN2: Drop in input
CN3: Compressor
CN4: Fa'auiga fa'atele
Operating modes – speed control
Drop in mode with thermostat
Under this mode of operation, the compressor speed is controlled according to the appliance’s requirements. The optimal speed is evaluated based on the speed of the previous cycle and the time the compressor has been running or stopped.
Le advantages of Drop-in Control mode include:
- Reduction in compressor power consumption compared to standard compressors.
- Reduction in pull-down time by operating at a higher speed when needed.
- Reduction in the number of start-ups/stops of the compressor.
- Lower Sound Power Level due to the system typically running at a lower speed.
The N206xx-Cxx series inverter is controlled by connecting terminal CN2 to the thermostat. The speed is determined by the controller’s rules (related to the operating rate and run time).
Fa'aaliga: To ensure the signal is effectively identified, the signal input CN2 should be in phase with L, and the voltage between CN2 and N should be greater than 98VAC. When the input power of the inverter is lower than 10VAC for more than 3 minutes, the inverter is considered to be powered off.
Drop-In Mode Operation
The following describes the detailed operation in drop-in mode:
Pull-Down Mode:
- The compressor initiates operation at 3900 RPM and maintains this speed for 15 minutes.
- Following this initial period, the compressor speed increases to 4200 RPM for an additional 15 minutes.
- Subsequently, the compressor speed increases to its maximum value and remains there until the thermostat opens. There is no time limit (set within the controller) for operation at maximum speed; the compressor continues at this speed until the thermostat reacts.
First Cycle: - After the Pull-Down phase, the first stabilized cycle will operate at 3900 RPM.
Stabilized Conditions: - During the stabilized cycle, the compressor speed is automatically adjusted based on the runtime of the previous cycle. The controller calculates the new speed using the following method:
O fea:
Operating Time (Tr) = The duration for which the compressor runs continuously.
Shutdown Time (Ts) = The duration for which the compressor is shut down (the minimum Shutdown Time is programmed to 5 minutes).
Speed Adjustment Logic:
– If the Operating Rate is higher than 85%, the speed in the next cycle will be reduced by 300RPM.
– If the Operating Rate is lower than 85%, the speed in the next cycle will be increased by 300RPM.
Examples:
Example 1
If Tr = 10 minutes and Ts = 5 minutes, Operating Rate = 10 / (10 + 5) = 0.66 (66%).
In this case, the compressor speed will be increased in the next cycle to achieve an 85% Operating Rate.
Example 2
If Tr = 40 minutes and Ts = 5 minutes, Operating Rate = 40 / (40 + 5) = 0.88 (88%).
In this case, the compressor speed will be reduced in the next cycle to achieve an 85% Operating Rate.
6. In situations requiring higher cooling capacity (e.g., cabinet door opening, introduction of a warm load, increase in ambient temperature, or modication of thermostat settings), if the thermostat does not open within 30 minutes beyond the previous operating time (Tr), the compressor will reenter Pull-Down Mode until the thermostat opens.
Static Defrost Mode:
Due to the absence of a dedicated defrost input, static defrost can be initiated by interrupting the controller’s power supply. To terminate the defrost cycle, the power supply to the compressor’s controller must be restored. Following this, the compressor will restart in Pull-Down Mode.
Frequency control mode
Under this mode of operation, the compressor speed is controlled through a frequency signal sent to the inverter. The compressor’s speed will follow the frequency signal, according to the relation described in Table 3 and illustrated in Graph 3.
Table 3: Speed control
NVS50 / NVS70FSC
| Control signal F (Hz) | Speed N (rpm) |
| 0 ÷ 48 | 0 |
| 48 ÷ 53 | 1600 |
| 53 ÷ 150 | 30 x F |
| 150 ÷ 180 | 4500 |
| > 180 | 0 |
Control signal characteristics
The frequency signal is a digital square wave, and its characteristics are described in Table 5.
Laulau 4:
| Ituaiga | Taua | Vaega |
| Faiga Fa'ailoga | Square wave pulse | |
| Taamilosaga Tiute | 50±10 | % |
| Maualuga voltagu tulaga | 5 | VDC |
| Minimum high voltagu tulaga | 4 | VDC |
| Maximum high voltagu tulaga | 6 | VDC |
| Maualalo voltagu tulaga | ≤0.5 | VDC |
| High current level | 0.003 | A |
| Maximum high current level | 0.010 | A |
| Minimum high current level | 0.002 | A |
| Maximum allowable reverse voltage | 5 | VDC |
| Control frequency signal | f0~f3 | Hz |
| Relation between Control frequency signal and compressor speed | Frequency(Hz)×30 | rpm |
Driver Protection Characteristics
The electronic driver is electronically protected against several possible malfunctions and failures. A LED light is installed on the driver board to display the intervention of any alarm and to identify its cause. The visual indication consists of a sequence of LED flashes repeating every 5 seconds until the alarm cause disappears. The code for the flashing sequence corresponding to each alarm is indicated in the following table.
Laulau 5:
| Ituaiga Puipuiga | tulaga LED |
| Puipuiga i luga o le taimi nei | 1 moli |
| Sili-voltagu puipuiga | 2 moli |
| Lalo-voltagu puipuiga | 3 moli |
| Puipuiga o Meafaigaluega | 4-5 flash |
| Electronic board Protection | 6-7 flash |
| Failure during starting | 8 moli |
| Puipuiga o le gau | 9-11 flash |
| Puipuiga o le vevela | 12 moli |
| Motor speed not reached | 13 moli |
| Puipuiga o le malosi tele | 14 moli |
Controller characteristics
Fua fa'atonu
Input and Output characteristic
Laulau 6:
| Uiga | Taua |
| Faagaioiga Voltage | Va'ai ile laulau 2 |
| Fua (L x W x H) | 166.9 x 134.5 x 50.8 mm |
| Fa'aaofia le malosi fa'atele | 50Hz/60Hz |
| Malosiaga fa'aoga | 600 W |
| Fa'asa'o Fa'atonu | ≥0.90 (PFC on) |
| Frequency input signal | Va'ai ile laulau 4 |
| Thermostat signal | Digital, nominal voltagu o le pule |
| Hot Gas Defrost signal | |
| uumi uaea afi | 350 mm |
| Lisi a'a | <3.5mA |
| Input fuse specification | 6.3A / 250Vac |
| Inverter and compressor cooling | Min. 3 m/s |
| vasega IP | IP 54 |
| O le vevela o galuega | 0ºC i le +60ºC |
| Susū galue | 10% i le 85% |
| Teuga vevela | -40ºC i le +80ºC |
Packaging and Ordering
Fa'apisinisi Fa'atau
(compressors on pallet)
| Code** | Fa'amatalaga | Compressor | Nominal voltage | Pule ituaiga | Fa'agaioiga faiga | Pallet tele |
| 125F3915 | NVK35FSC+N206FM-C02 drop-in; 220-240V | NVK35FSC | 220-240V | N206FM-C02 | Tuu i totonu | 24×5=120 pcs |
| 125F3916 | NVK35FSC+N206FM-B02 frequency; 220-240V | NVK35FSC | 220-240V | N206FM-B02 | Fa'atele | 24×5=120 pcs |
| 125F3923 | NVK35FSC+N206FR-C02 drop-in; 115-127V | NVK35FSC | 115-127V | N206FR-C02 | Tuu i totonu | 24×5=120 pcs |
| 125F3924 | NVK35FSC+N206FR-B02 frequency; 115-127V | NVK35FSC | 115-127V | N206FR-B02 | Fa'atele | 24×5=120 pcs |
| 125F3911 | NVS50FSC+N206FM-C04 drop-in; 220-240V | NVS50FSC | 220-240V | N206FM-C04 | Tuu i totonu | 24×5=120 pcs |
| 125F3912 | NVS50FSC+N206FM-B04 frequency; 220-240V | NVS50FSC | 220-240V | N206FM-B04 | Fa'atele | 24×5=120 pcs |
| 125F3927 | NVS50FSC+N206FR-C04 drop-in; 115-240V | NVS50FSC | 115-127V | N206FR-C04 | Tuu i totonu | 24×5=120 pcs |
| 125F3928 | NVS50FSC+N206FR-B04 frequency; 115-240V | NVS50FSC | 115-127V | N206FR-B04 | Fa'atele | 24×5=120 pcs |
| 125F3901 | NVS70FSC+ N206FM-C05; drop-in; 220-240V | NVS70FSC | 220-240V | N206FM-C05 | Tuu i totonu | 24×5=120 pcs |
| 125F3902 | NVS70FSC+ N206FM-B05; frequency; 220-240V | NVS70FSC | 220-240V | N206FM-B05 | Fa'atele | 24×5=120 pcs |
| 125F3925 | NVS70FSC+ N206FR-C05; drop-in; 115-127V | NVS70FSC | 115-127V | N206FR-C05 | Tuu i totonu | 24×5=120 pcs |
| 125F3926 | NVS70FSC+ N206FR-B05; frequency; 115-127V | NVS70FSC | 115-127V | N206FR-B05 | Fa'atele | 24×5=120 pcs |
** – code contains compressor + controller + mountings
Pepa Tasi
(compressors packed individually in carton box)
| Code** | Fa'amatalaga | Compressor | Nominal voltage | Pule ituaiga | Fa'agaioiga faiga |
| 125B3915 | NVK35FSC+N206FM-C02 drop-in; 220-240V | NVK35FSC | 220-240V | N206FM-C02 | Tuu i totonu |
| 125B3916 | NVK35FSC+N206FM-B02 frequency; 220-240V | NVK35FSC | 220-240V | N206FM-B02 | Fa'atele |
| 125B3923 | NVK35FSC+N206FR-C02 drop-in; 115-127V | NVK35FSC | 115-127V | N206FR-C02 | Tuu i totonu |
| 125B3924 | NVK35FSC+N206FR-B02 frequency; 115-127V | NVK35FSC | 115-127V | N206FR-B02 | Fa'atele |
| 125B3911 | NVS50FSC+N206FM-C04 drop-in; 220-240V | NVS50FSC | 220-240V | N206FM-C04 | Tuu i totonu |
| 125B3912 | NVS50FSC+N206FM-B04 frequency; 220-240V | NVS50FSC | 220-240V | N206FM-B04 | Fa'atele |
| 125B3927 | NVS50FSC+N206FR-C04 drop-in; 115-240V | NVS50FSC | 115-127V | N206FR-C04 | Tuu i totonu |
| 125B3928 | NVS50FSC+N206FR-B04 frequency; 115-240V | NVS50FSC | 115-127V | N206FR-B04 | Fa'atele |
| 125B3925 | NVS70FSC+ N206FM-C05; drop-in; 220-240V | NVS70FSC | 220-240V | N206FM-C05 | Tuu i totonu |
| 125B3926 | NVS70FSC+ N206FM-B05; frequency; 220-240V | NVS70FSC | 220-240V | N206FM-B05 | Fa'atele |
| 125B3901 | NVS70FSC+ N206FR-C05; drop-in; 115-127V | NVS70FSC | 115-127V | N206FR-C05 | Tuu i totonu |
| 125B3902 | NVS70FSC+ N206FR-B05; frequency; 115-127V | NVS70FSC | 115-127V | N206FR-B05 | Fa'atele |
Fa'aaliga: Minimum order quantity is 20 pcs
** – code contains compressor + controller + mountings
Danfoss Commercial Compressors
Is a worldwide manufacturer of compressors and condensing units for refrigeration and HVAC applications. With a wide range of high quality and innovative products we help your company to find the best possible energy efficient solution that respects the environment and reduces total life cycle costs.
E 40 tausaga o matou poto masani i totonu o le atinaʻeina o hermetic compressors lea na aumaia ai i matou i totonu o taʻitaʻi o le lalolagi i la matou pisinisi, ma faʻatulagaina i matou o ni tagata tomai faʻapitoa faʻatekonolosi faʻavavevave. O aso nei matou te fa'agaioia mai fale fa'ainisinia ma fale gaosi oloa e va'aia i konetineta e tolu.
Our products can be found in a variety of applications such as rooftops, chillers, residential air conditioners, heat pumps, cold-rooms, supermarkets, milk tank cooling and industrial cooling processes.
Danfoss A / S
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Danfoss NV Series FSC Variable Speed Compressors [pdf] Tusi Taiala NVK35FSC, NVS50FSC, NVS70FSC, NV Series FSC Variable Speed Compressors, NV Series FSC, Variable Speed Compressors, Speed Compressors |