R410A refrigerant Total versatility Integrated hydronic unit on evaporator/condenser side Integrated condensation control Water-cooled liquid chillers and water-to-water heat pumps NECS-W_0604_1204_201211_EN r HFC R-410A (The photo of the unit is indicative and may change depending on the model) Climaveneta Technical Bulletin 0604 - 1204 174 - 371 kW NECS-W
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R410A refrigerant
Total versatility
Integrated hydronic unit on evaporator/condenser side
Integrated condensation control
<
<
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Water-cooled liquid chillers and water-to-water heat
pumps
NECS-W_0604_1204_201211_EN
r HFC
R-410A
(The photo of the unit is indicative and may change depending on the model)
Climaveneta Technical Bulletin
0604 - 1204
174 - 371 kW
NECS-W
II NECS-W_0604_1204
NECS-W
HFC R410A
SUMMARYNECS-W
0604 - 1204
Liability disclaimer
This bulletin is not exhaustive about: installation, use, safety
precautions, handling and transport. Refer to “General Manual
for Installation” for further informations.
This bulletin refers to standard executions, in particular
for dimension, weight, electric, hydraulic, aeraulic and refriger-
ant connections (whereas applicable). Contact Climaveneta
Commercial Offi ce for further drawings and schemes.
Climaveneta declines any liability derived from the bulletin’s
use.
This bulletin is of exclusive property of Climaveneta, and all
forms of copy are prohibited.
The data contained herein are subject to variation without no-
tice.
Company quality system certi-
fi ed to UNI EN ISO 9001
This company par-
ticipates in the Eurovent
Certifi cation Programme.
The products are listed in the
Directory of certifi ed products.
Eurovent certifi cation
applied to units with cool-
ing capacity up to l500 kW
for air cooled water chillers
and water cooled liquid chillers.
1. Product presentation
1.1 Energy indices ESEER and IPLV
2. Unit description
2.1 Standard unit composition
2.2 Accessories
3. Technical data
3.1 General technical data
3.2 Cooling capacity performance
3.3 Heat pump capacity performance
4. Operating range
5. Hydraulic data
5.1 Water fl ow and pressure drop
6. Electrical data
7. Full load sound level
8. Dimensional drawings
9. Free spaces - lifting mode - symbols
10. Legend of pipe connections
pg. n° III
pg. n° V
pg. n° 1
pg. n° 1
pg. n° 1
pg. n° 2
pg. n° 2
pg. n° 3
pg. n° 6
pg. n° 9
pg. n° 10
pg. n° 10
pg. n° 16
pg. n° 17
pg. n° A1
pg. n° A3
pg. n° A4
III NECS-W_0604_1204
NECS-W
HFC R410A
1. PRODUCT PRESENTATION
NECS, the new CLIMAVENETA R410A proposal
Scroll compressors, featuring high effi ciency, low vibrations
and low noise emissions.
Flexible range. Available from 113 – 341 kW with 9 sizes and
5 versions.
Part load effi ciency with EER > 4.3
New controller with QuickMind.
Idrorelax, for turning your ideas into reality.
Climaveneta introduces its new NECS-W range of chillers and
heat pumps with scroll compressors, plate exchangers and R-
410A, with both one-circuit two compressors and two-circuit
four compressors, focused on maximum effi ciency and mini-
mum noise emission.
Why R-410AAlthough R-410A is a blend, it behaves just like a pure gas and features a negligible temperature glide. Thanks to its outstand-ing heat conductivity, R-410A contributes towards achieving high system effi ciency. R-410A is also an ecological gas be-cause its high effi ciency reduces electricity consumption and consequently CO2 emissions and because it does not damage the ozone layer (ODP = 0).
The scroll compressor has been expressly redesigned for use with the new gas and is now even more compact and silent
than before.
Complete versatilityNECS-W units are designed to fully satisfy any application or installation needs throughout a complete range of models, hy-dronic confi gurations and accessories. NECS-W is available in chiller mode (chilled water production), heat pump for hot wa-ter production (plus possible water side reversal) NECS-WH and fi nally heat pump with “refrigerant side reversal” NECS-
WN (chilled/hot water production).
High effi ciency at partial loadClimaveneta has designed NECS-W units with the goal of guaranteeing high effi ciency at part load. The result achieved in the new single-circuit dual-compressor is an ESEER up to 6.01, equivalent to a 33% saving in seasonal energy consump-tion compared to traditional R-407C double-circuit unit.
Advantages
The technological choices aimed to provide the maximum
overall quality and the use of the most innovative technologies
make NECS-W a unit able to ensure maximum energy effi -
ciency, easy installation thanks to its compact size, versatility
and settings for integration in the Idrorelax centralised hydronic
system (www.idrorelax.it).
Reversible heat pumpsAll NECS-W are available as NECS-WN heat pump model; this model completes the Climaveneta water cooled units range.Making a comparison between NECS-WN and a traditional “water side reversal” heat pump, reductions in installation spaces and an easier water connection layout are achieved. It
means saving in installation costs and time.
Condensing pressure control deviceNECS-W electronic control can manage the best suitable con-densing pressure control device for every applications: pres-sostatic valve, 2 or 3 way modulating valve and inverter on the condenser pumps. NECS-W units can therefore be combined with dry-coolers, evaporating towers and geothermal probes, or used to cool
open-loop water (e.g.: aqueducts, wells, water tables).
Kit pumps available on hot/cold sideNECS-W units are designed in order to minimize installation time. Units are available with both evaporator /condenser hy-dronic kit.Hydronic kits are fully accessorised with every hydronic device in order to obtain: space reduction, installation costs saving and shortening installation time.The units are plug&play thanks to the feasibility to install 1 or 2 pumps on board, high and low pressure head on both evapora-tor and condenser sides.
IV NECS-W_0604_1204
NECS-W
HFC R410A
Consistent with corporate culture, the NECS-W series was
designed to offer extremely high quality products with cutting-
edge technology focusing on maximum energy effi ciency at
both full (EER) and part load (ESEER).
Energy effi ciency at full loadNECS-W units stand out for their particularly high EER energy effi ciency index. This result was achieved by focusing on the
design of plate exchangers both on the condenser side and on the evaporator side.These construction choices have both increased effi ciency and provided extremely high levels of reliability while signifi cantly increasing compressor working life.
Energy effi ciency at part loadAttention to energy consumption is continually gaining impor-tance, even at European level.The installed chiller unit works at full load only for extremely short periods of time while most of the energy is produced with part loads between 50 and 75%.
The ESEER parameter proposed by Eurovent, takes part load operating conditions into account when assessing unit effi -
ciency.
V NECS-W_0604_1204
NECS-W
HFC R410A
1.1 Energy indices ESEER and IPLV
Increasingly closer attention is being paid towards the power
consumption of air-conditioning equipment, both in Europe and
elsewhere.
For many years in the United States, reference has not just
been made to effi ciency at rated conditions. A valuation index
is used which considers marginal operation of the unit at rated
conditions as well as the increased usage when the separation
stages of the cooling compressors are used.
The valuation index adopted in the United States is called IPLV
(Integrated Part Load Value) and is defi ned in the regulations
issued by ARI (American Refrigeration Institute).
ARI Standard
IPLVARI =(1*EER100%
+ 42*EER 75%
+ 45*EER50%
+ 12*EER25%
) /100
Where EER100%
, EER75%
, EER50%
, EER25%
are the effi ciencies of
the chiller in the various load conditions (100% - 75% - 50% and
25% respectively), calculated in the external air temperature
conditions shown below. The temperature of the water leaving
the evaporator is considered constant at 6.7°C in all load condi-
tions, with a delta of 5°C in the full load condition.
The multipliers 1, 42, 45 e 12 are the cooling performance coef-
fi cients in various load conditions statistically calculated by ARI
on the basis of surveys conducted, for various types of build-
ings and operating conditions, in 29 American cities.
ESEER Comparison:
NECS-W single-circuit vs. traditional dual-circuit unit.
The comparison proves that the new single-circuit NECS-W
units with R-410A feature signifi cantly greater energy effi ciency
(ESEER + 38%) over traditional dual-circuit units with R-407C.
NECS-W 202 Traditional unit Energy effi ciency percent difference
Single circuit R-410A Two scroll - two circuit R-407C NECS-W 202 vs a traditional R407-C unit
EER 100% 4,53 4,48 + 1%
EER 75% 5,55 4,55 + 22%
EER 50% 6,55 4,48 + 46%
EER 25% 5,88 4,55 + 26 %
ESEER 6,01 4,52 + 33%
NECS-W ESEER
0604 5.79
0704 5.92
0804 5.82
0904 5.93
1004 5.93
1104 5.99
1204 5.89
In Europe there is a proposal for EECCAC (Energy Effi ciency
and Certifi cation of Central Air Conditioner)
Proposal EECCAC
ESEER = (3*EER100%
+33*EER75%
+ 41*EER50%
+ 23*EER25%
)/100
Evaporator temp. leaving 6,7°C
DeltaT full load 5°C
Load 100% 75% 50% 25%
Cond. water temp. 30°C 26°C 22°C 18°C
Using the energy indices
After establishing which index to use and estimating the total
power required by the system in the summer mode (in kWh),
we can calculate seasonal electricity consumption (in kWh) us-
ing the following formula:
Power absorbed = Power requested / Index of effi ciency
The real power calculation can be obtained more correctly in a
“dynamic” form, that is, considering the load performance curve
at different external temperatures, the location and the refer-
ence number of operating hours.
These fi gures will allow plant consultants and designers to
make their evaluations depending on the type of building, the
place of installation and the type of heat load. etc.. They can
also determine the energy index using the method that best re-
fl ects plant requirements and can make comparisons between
similar or equivalent systems using the same reference unit.
NECS-WH ESEER
0604 5.79
0704 5.92
0804 5.82
0904 5.93
1004 5.93
1104 5.99
1204 5.89
NECS-WN ESEER
0604 5.69
0704 5.81
0804 5.72
0904 5.82
1004 5.81
1104 5.89
1204 5.78
IPLV (Integrated Part Load Value) ARI Standard indices
ESEER (European Seasonal Energy Effi ciency Ratio) Indices for EECCAC proposal
VI NECS-W_0604_1204
NECS-W
HFC R410A
All the two-compressor units are equipped, as a standard, with
the “W3000 Base” keyboard with LED display.
On the four-compressor units the user friendly “W3000 Com-
pact” keyboard with LCD is installed as a standard; also avail-
able, on demand, for the two compressors units.
The “W3000 Compact” on board keyboard can be connected to
a remote keyboard with LCD display.
Main functions: QuickMind, local and remote FWS supervi-
commitment to continually developing its electronics technol-
ogy. The heat pumps, moreover, are fi tted with the original
Climaveneta defrosting control system called “Smart Defrost”
which considerably reduces defrosting times, thus improving
the energy performance of the unit. Interfaces with BMS sys-
tems: METASYS®, MODBUS®, LONWORKS®, SIEMENS®,
TREND®.
Black Box logs data relative to 200 alarm events which can be
printed with a personal computer.
CONTROL UNIT with LED display
QuickMind is a special control unit which monitors the main op-
erating parameters, predicts system behaviour and anticipates
unit settings in order to constantly optimise performance; it al-
lows both return and delivery water temperatures to be chosen
as adjustment parameters. It can reduce outlet temperature
fl uctuations even with a small amount of water in the system.
When, for dual-compressor chillers featuring a maximum of 12
start-ups per hour and using a traditional adjustment system,
the minimum recommended water content is 5.5 l/kW, Quick-
Mind ensures the same chiller operates correctly even with a
water content of just 2.5 l/kW and considerably reduces outlet
temperature fl uctuations. The above graph shows that outlet
temperature fl uctuations with QuickMind are limited to 4.3°C
as opposed to 7.54°C if the traditional adjustment system were
used, without even ensuring an acceptable minimum compres-
sor start time.
VII NECS-W_0604_1204
NECS-W
HFC R410A
Integrated Hydronic Unit (Optional)
(Not available on NECS-WH)
The NECS-W series has been designed to reduce instal-
lation work to a minimum.
The integrated hydronic unit incorporates all the hydrau-
lic components, thus optimising installation space, time
and costs.
- Horizontal one-piece centrifuge pump
- Pump inlet pressure gauge
- Discharge valve
- Air vent
- 3 bar safety valve
- Expansion tanks pre-pressurised
- Check valve (only if P2 is fi tted)
- Y-shaped water fi lter with stainless steel mesh (option-
al)
- External water connections with Victalic prearrange-
ment
Available confi gurations
Hydronic group 1 pump 2 poles low head
Hydronic group 2 pumps 2 poles low head
Hydronic group 1 pump 2 poles high head
Hydronic group 2 pumps 2 poles high head
Units can be equipped with up to 4 pumps, two on the
evaporator and two on the condenser side.
For more details, see the “Hydronic Unit” section.
IDRORELAX
The NECS range of chillers with heat pump is available in
the IR confi guration; this allows units to be combined with
IDRORELAX, a centralised hydronic system for manag-
ing cooling and heating requirements and producing hot
running water for residential, hotel and offi ce applications.
Further information on the IDRORELAX system can be
obtained by consulting the relative documentation.
1 NECS-W_0604_1204
NECS-W
HFC R410A
Water-to-water chillers
Water-to-water chillers. The unit is supplied with anti-freeze oil
and refrigerant and has been factory tested. On-site installation
therefore just involves making connections to the mains power
and water supplies.
Unit charged with R410A ecological refrigerant.
2.1 Standard unit composition
Supporting frame
Base and frame in thick hot-galvanised shaped sheet steel. All
parts polyesters-painted.
Panelling
The external panelling, made from simil peraluman, epoxy
painted sheet metal, offers maximum ease of access to the in-
ternal components.
Compressor chamber panels not insulated in the standard
version. The panels can be soundproofed on request with Fib-
erform 30 mm th. To reduce noise, consult the sound levels
page.
Compressors
Hermetic scroll compressors complete with an oil sump heater,
electronic overheating protection with centralised manual reset
and a two-pole electric motor.
Exchanger side customer
AISI 316 steel braze-welded plate exchanger. The heat ex-
changers are insulated with a closed-cell condensation proof
lining in neoprene.
When the unit is working, it is protected against lack of fl ow by
a differential pressure switch mounted on the water side. The
unit can work with antifreeze mixtures at exchanger outlet tem-
peratures as low as -8°C.
Exchanger side thermal source
AISI 316 steel braze welded plate exchanger. The exchangers
can be used with water from wells, from towers or with dry-
coolers.
Refrigerant circuit
Main components of the refrigerant circuit:
- dryer fi lter,
- liquid line sight glass with humidity indicator,
- externally equalised thermostatic valve,
- high pressure safety valve,
- high and low pressure switches,
- high and low pressure gauges.
Electric power and control panel
Electric power and control panel, built to EN 60204-1/EC 204-1
standards, complete with:
- control circuit transformer,
- general door lock isolator,
- automatic circuit breakers and contactors for compressors,
- terminals for cumulative alarm block (BCA),
- remote ON/OFF terminals,
- spring-type control circuit terminal board,
- electronic controller.
AVAILABLE VERSIONS
B (base)
Standard unit.
2.2 Accessories
- Compressor casing
- Rubber isolators
- Electronic soft start
- Compressor discharge valves
- Compressor suction valves
- Evaporator water fl ow switch (supplied separately)
- 3 way modulating valve for condensing control (supplied
loose)
- 2 way modulating valve for condensing control (supplied
loose)
- Pump with on board inverter for condensing control
- Victaulic fl exible coupling kit for both condenser and evapora-
tor
- Automatic circuit breakers
- Numbered wires
- Remote control phase sequence
- Solenoid valve
- Remote keyboard (supplied separately)
- Water pumps kit (see attachment)
- Evaporator steel fi lter kit (supplied separately)
- Connecting manifolds
2. UNIT DESCRIPTION
2
NECS-W / B3.1 GENERAL TECHNICAL DATA
NECS-W / B 0604 0704 0804 0904 1004 1104 1204Power supply V/ph/Hz 400/3/50 400/3/50 400/3/50 400/3/50 400/3/50 400/3/50 400/3/50PERFORMANCECOOLING ONLY (GROSS VALUE)Cooling capacity (1) kW 174 203 228 258 288 329 371Total power input (1) kW 38,9 45,2 51,6 58,0 64,0 74,0 83,5EER (1) 4,47 4,48 4,42 4,45 4,50 4,44 4,44ESEER (1) 5,79 5,92 5,82 5,93 5,93 5,99 5,89COOLING ONLY (EN14511 VALUE)Cooling capacity (1)(2) kW 173 202 227 257 287 328 370EER (1)(2) 4,29 4,32 4,25 4,29 4,35 4,30 4,28ESEER (1)(2) 5,20 5,33 5,27 5,34 5,40 5,47 5,33Cooling energy class C C C C C C CEXCHANGERSHEAT EXCHANGER USER SIDE IN REFRIGERATIONWater flow (1) m³/h 29,9 34,9 39,2 44,4 49,6 56,6 63,9Pressure drop (1) kPa 35,0 32,9 41,6 39,4 39,4 35,2 44,9HEAT EXCHANGER SOURCE SIDE INREFRIGERATIONWater flow (1) m³/h 36,5 42,5 47,9 54,1 60,3 68,9 77,9Pressure drop (1) kPa 37,0 36,1 35,5 36,6 33,7 35,6 37,9COMPRESSORSN. of compressors N° 4 4 4 4 4 4 4Number of capacity N° 4 4 4 4 4 4 4No. of circuits N° 2 2 2 2 2 2 2Regulation STEPS STEPS STEPS STEPS STEPS STEPS STEPSMin. capacity step % 25 25 25 25 25 25 25Refrigerant R410A R410A R410A R410A R410A R410A R410ARefrigerant charge kg 17,0 19,0 20,0 24,0 26,0 30,0 32,0Oil charge kg 17,0 18,0 19,0 23,0 27,0 26,0 25,0NOISE LEVELNoise Pressure (3) dB(A) 54 55 56 57 58 59 59Noise Power (4) dB(A) 86 87 88 89 90 91 91SIZE AND WEIGHTA (5) mm 2227 2227 2227 2227 2227 2227 2227B (5) mm 877 877 877 877 877 877 877H (5) mm 1780 1780 1780 1780 1780 1780 1780Operating weight (5) kg 1050 1125 1190 1270 1355 1445 1510
Notes:1 Evaporator water (in/out) = 12°C/7°C, condenser water (in/out) = 30°C/35°C, based on Eurovent Standard2 Values in compliance with EN14511-3:20113 Average sound pressure level, at 10m distance, unit in a free field on a reflective surface; non-binding value obtained from the sound power level.4 Sound power on the basis of measurements made in compliance with ISO 9614 and Eurovent 8/1 for Eurovent certified units; in compliance with ISO 3744 for non-certified units.5 Unit in standard configuration/execution, without optional accessories.- Unavailable
2 - H
NECS-W / B /HGENERAL TECHNICAL DATA
NECS-W / B /H 0604 0704 0804 0904 1004 1104 1204Power supply V/ph/Hz 400/3/50 400/3/50 400/3/50 400/3/50 400/3/50 400/3/50 400/3/50PERFORMANCECOOLING ONLY (GROSS VALUE)Cooling capacity (1) kW 174 203 228 258 288 329 371Total power input (1) kW 38,9 45,2 51,6 58,0 64,0 74,0 83,5EER (1) 4,47 4,48 4,42 4,45 4,50 4,44 4,44ESEER (1) 5,79 5,92 5,82 5,93 5,93 5,99 5,89COOLING ONLY (EN14511 VALUE)Cooling capacity (1)(2) kW 173 202 227 257 287 328 370EER (1)(2) 4,29 4,32 4,25 4,29 4,35 4,30 4,28ESEER (1)(2) 4,53 4,56 4,50 4,53 4,60 4,56 4,54Cooling energy class C C C C C C CHEATING ONLY (GROSS VALUE)Heating capacity (3) kW 191 220 248 280 313 358 404Total power input (3) kW 47,9 55,0 62,2 69,9 77,3 89,3 101COP (3) 3,99 4,01 3,98 4,01 4,05 4,00 4,00HEATING ONLY (EN14511 VALUE)Heating capacity (3)(2) kW 192 221 248 281 314 358 405COP (3)(2) 3,91 3,94 3,91 3,94 3,98 3,94 3,94Cooling energy class C C C C C C CEXCHANGERSHEAT EXCHANGER USER SIDE IN REFRIGERATIONWater flow (1) m³/h 29,9 34,9 39,2 44,4 49,6 56,6 63,9Pressure drop (1) kPa 35,0 32,9 41,6 39,4 39,4 35,2 44,9Water flow (1) m³/h 36,5 42,5 47,9 54,1 60,3 68,9 77,9Pressure drop (1) kPa 37,0 36,1 35,5 36,6 33,7 35,6 37,9HEAT EXCHANGER USER SIDE IN HEATINGWater flow (3) m³/h 33,2 38,3 43,0 48,7 54,4 62,1 70,2Pressure drop (3) kPa 30,6 29,4 28,7 29,6 27,3 29,0 30,8Water flow (3) m³/h 25,1 29,0 32,5 36,9 41,3 47,1 53,2Pressure drop (3) kPa 24,6 22,8 28,6 27,2 27,3 24,4 31,1COMPRESSORSN. of compressors N° 4 4 4 4 4 4 4Number of capacity N° 4 4 4 4 4 4 4No. of circuits N° 2 2 2 2 2 2 2Regulation STEPS STEPS STEPS STEPS STEPS STEPS STEPSMin. capacity step % 25 25 25 25 25 25 25Refrigerant R410A R410A R410A R410A R410A R410A R410ARefrigerant charge kg 17,0 19,0 20,0 24,0 26,0 30,0 32,0Oil charge kg 17,0 18,0 19,0 23,0 27,0 26,0 25,0NOISE LEVELNoise Pressure (4) dB(A) 54 55 56 57 58 59 59Noise Power (5) dB(A) 86 87 88 89 90 91 91SIZE AND WEIGHTA (6) mm 2227 2227 2227 2227 2227 2227 2227B (6) mm 877 877 877 877 877 877 877H (6) mm 1780 1780 1780 1780 1780 1780 1780Operating weight (6) kg 1050 1125 1190 1270 1355 1445 1510
Notes:1 Plant (side) cooling exchanger water (in/out) 12°C/7°C; Source (side) heat exchanger water (in/out) 30°C/35°C2 Values in compliance with EN14511-3:20113 Plant (side) heating exchanger water (in/out) 40°C/45°C; Source (side) heat exchanger water (in/out) 10°C/* °C (flow rate as in cooling)4 Average sound pressure level, at 10m distance, unit in a free field on a reflective surface; non-binding value obtained from the sound power level.5 Sound power on the basis of measurements made in compliance with ISO 9614 and Eurovent 8/1 for Eurovent certified units; in compliance with ISO 3744 for non-certified units.6 Unit in standard configuration/execution, without optional accessories.- Unavailable
(1) Condenser air (in) 30/35 °C(2) Evaporator water (in/out) 12/7 °C(3) With temperatures down to -8°C use anti-freeze mixtures. In case of lower temperatures, please contact our Sales Department.
ETHYLENE GLYCOL MIXTURE
Ethylene glycol and water mixtures, used as a heat-conveying fluid, cause a variation in unit performance. For correct data, use the factors indicated in the following table.
Performances are based on clean condition of tubes (fouling factor =1). For different fouling values, performance should be adjusted using the correction factors shown in the following table.
f1 - f2 - f3 capacity correction factorsfk1 - fk2 - fk3 compressor power input correction factorsfx1 - fx2 - fx3 total power input correction factors
Limits to exchanger water temperature are valid within the minimum - maximum water flow range indicated in the Hydraulic Data section.
4. OPERATING RANGE
9 NECS-W_0604_1204
NECS-W
HFC R410A
SIZEEvaporator Condenser Desuperheater
K Q min m3/h
Q max m3/h
W.c. min m3 K Q min
m3/hQ max m3/h K Q min
m3/hQ max m3/h
0604 39.0 18.6 49.9 1.3 27.8 11.3 45.7 - - -
0704 27.0 21.7 58.3 1.5 20.0 13.2 53.2 - - -
0804 27.0 24.4 65.4 1.6 15.5 14.9 60.0 - - -
0904 20.0 27.7 74.1 1.9 12.5 16.8 67.7 - - -
1004 16.0 30.9 82.8 2.1 9.3 18.7 75.5 - - -
1104 11.0 35.3 94.4 2.4 7.5 21.4 86.2 - - -
1204 11.0 39.8 106.6 2.7 6.3 24.2 97.5 - - -
Water flow in the heat exchangers is given by:Q=Px 0,86/Dt
Q: water flow (m³/h)Dt: difference between inlet and outlet water temp. (°C)P: heat exchanger capacity (kW)
Pressure drop is given by:Dp=K x Q² /1000
Q: water flow (m³/h)Dp: pressure drop (kPa)K: unit size ratio
Q min: minimum water flow admitted to the heat exchang-er.
Q max: maximum water flow admitted to the heat exchang-er.
W.c min: minimum water content admitted in the plant, using traditional control logic.
5.1 Waterflowandpressuredrop
5. HYDRAULIC DATA
10 NECS-W_0604_1204
NECS-W
HFC R410A
The new NECS-W units can be equipped with evaporator and/
or condenser hydronic kits. The kit incorporates the main hy-
draulic components thus optimizing hydraulic and electrical in-
stallation space, time and costs.
Moreover NECS-W can be provided with INVERTER pumps on
the condenser side. This device enables the condensing pres-
sure control, through the variable speed pump, reducing pump
energy consumption.
Available confi gurations
Evaporator and/or condenser hydronic kit can be provided with
following confi gurations:
Hydronic group 1 pump low head
Hydronic group 2 pumps low head
Hydronic group 1 pump high head
Hydronic group 2 pumps high head
Units can be equipped with up to 4 pumps, two on the evapora-
tor and two on the condenser side.
2-pole pump
Low head pump with 100 kPa external static pressure.
High head pump with 200 kPa external static pressure.
Horizontal one-piece centrifuge pump with one impeller, axial
suction and radial delivery, AISI 304L stainless steel pump body
impeller. The section of shaft in contact with the liquid is made
from stainless steel. Mechanical seal made from components
in ceramics/carbon/NBR/AISI304. Three-phase electric motor
protected to IP55, insulation class F, suitable for continuous
service.
Second pump
A second stand-by pump for high or low pressures is available
on request. The pumps are automatically exchanged on the
basis of a rotation programme and the stand-by pump cuts in
automatically if the primary pump fails. The two-pump hydron-
ic assembly is also fi tted with check valves to ensure the unit
works correctly.
Water-side mechanical fi lter (optional)
Y-fi lter designed and built to capture the impurities in the hy-
draulic circuit. It is fi tted with a 0.9 mm stainless steel mesh car-
tridge which can be replaced without removing the valve body
from the piping.
6. HYDRONIC GROUPS
11 NECS-W_0604_1204
NECS-W
HFC R410A
Confi guration of hydronic unit with 1 pump per circuit
The hydronic group comprises:
- P Horizontal one-piece centrifuge pump.
- MA Hydraulic circuit pressure gauge
- SC Discharge valve
- S1 Exchanger input water temperature probe
- S2 Exchanger outlet water temperature probe
- SF Air vent
- VA 3 bar safety valve.
- VE 8-litre expansion tanks, pre-pressurised to 1,5 bar
Confi guration of hydronic unit with 2 pumps per circuit
The hydronic group comprises:
- P Horizontal one-piece centrifuge pump.
- MA Hydraulic circuit pressure gauge
- SC Discharge valve
- S1 Exchanger input water temperature probe
- S2 Exchanger outlet water temperature probe
- SF Air vent
- VA 3 bar safety valve.
- VE 8-litre expansion tank, pre-pressurised to 1,5 bar
- VR Check valve (only if P2 is fi tted)
The electrical panel of the unit is protected with Automatic cir-
cuit breakers
The supply does not include the following accessories though
these are recommended to ensure correct system operation:
- Pressure gauges upline and downline from the unit.
F.L.I. Full load power input at max admissible conditionF.L.A. Full load current at max admissible conditionL.R.A. Locked rotor amperes for single compressorS.A. Starting current
(1) Safety values to be considered when cabling the unit for power supply and line-protections
Power supply 400/3/50Voltage tolerance: 10%Maximum voltage unbalance: 3%
7. ELECTRICAL DATA
16 NECS-W_0604_1204
NECS-W
HFC R410A
BNECS-W8. FULL LOAD SOUND LEVEL
SIZE Octave band [Hz]
2000100050025012563 80004000
Total sound
level
Sound power level dB(A)
SOUND POWER
75 77 81 80 82 80 74 68 860604
76 78 82 81 83 81 75 69 870704
77 79 83 82 84 82 76 70 880804
78 80 84 83 85 83 77 71 890904
79 81 85 84 86 84 78 72 901004
80 82 86 85 87 85 79 73 911104
80 82 86 85 87 85 79 73 911204
Plant (side) cooling exchanger water (in/out) 12/7 °C
Source (side) heat exchanger water (in/out) 30/35 °C
Sound power on the basis of measurements made in compliance with ISO 9614 and Eurovent 8/1 for Eurovent certified units;
in compliance with ISO 3744 for non-certified units
Such certification refers specifically to the sound Power Level in dB(A). This is therefore the only acoustic data to be considered as binding.
Working conditions
SIZE Octave band [Hz] at 10 m
2000100050025012563 80004000
Total sound
level
Sound pressure level dB(A)
SOUND PRESSURE LEVEL
43 45 49 48 50 48 42 36 540604
44 46 50 49 51 49 43 37 550704
45 47 51 50 52 50 44 38 560804
46 48 52 51 53 51 45 39 570904
47 49 53 52 54 52 46 40 581004
48 50 54 53 55 53 47 41 591104
48 50 54 53 55 53 47 41 591204
Plant (side) cooling exchanger water (in/out) 12/7 °C
Source (side) heat exchanger water (in/out) 30/35 °C
Average sound pressure level, at 10 (m.) distance, unit in a free field on a reflective surface; non-binding value obtained
- Make sure that all the panels are firmly fixed in place before moving the unit.- Before lifting it, check the weight on the CE label.- Use all, and only, the lifting points provided,- Use slings of equal length,- Use a spread-bar (not included)- Move the unit carefully and avoid abrupt movements.
REMARKS:For installation purposes, please refer to the documentation sent after the purchase-contract.This technical data should be considered as indicative. CLIMAVENETA may modify them at any moment.
R3
R1 R2
R4
10. CLEARANCE - LIFTING - SYMBOLS
LIFTING
pspeggio
Casella di testo
UNI ISO 228/1
Pipe threads where pressure-tight joints are not made on the
threads - Designation, dimensions and tolerances.
Used terminology:
G: Pipe threads where pressure-tight joints are not made on the
threads
A: Close tolerance class for external pipe threads where pres-
sure-tight joints are not made on the threads
B: Wider tolerance class for external pipe threads where pres-
sure-tight joints are not made on the threads
Internal threads: G letter followed by thread mark (only toler-
ance class)
External threads: G letter followed by thread mark and by A let-
ter for A class external threads or by B letter
for B class external threads.
UNI ISO 7/1
Pipe threads where pressure-tight joints are made on the
threads - Designation, dimensions and tolerances.
Used terminology:
Rp: Internal cylindrical threads where pressure-tight joints are
made on the threads
Rc: Internal conical threads where pressure-tight joints are
made on the threads
R: External conical threads where pressure-tight joints are
made on the threads
Internal cylindrical threads: R letter followed by p letter
Internal conical threads: R letter followed by c letter
External conical threads: R letter
Designation Description
UNI ISO 7/1 - Rp 1 1/2
Internal cylindrical threads where pressure-tight joints are made on the threads, defi ned by stand-
ard UNI ISO 7/1
Conventional ø 1 1/2”
UNI ISO 7/1 - Rp 2 1/2
Internal cylindrical threads where pressure-tight joints are made on the threads, defi ned by stand-
ard UNI ISO 7/1
Conventional ø 2 1/2”
UNI ISO 7/1 - Rp 3
Internal cylindrical threads where pressure-tight joints are made on the threads, defi ned by stand-
ard UNI ISO 7/1
Conventional ø 3”
UNI ISO 7/1 - R 3
External conical threads where pressure-tight joints are made on the threads, defi ned by standard
UNI ISO 7/1
Conventional ø 3”
UNI ISO 228/1 - G 4 B
Internal cylindrical threads where pressure-tight joints are not made on the threads, defi ned by
standard UNI ISO 228/1
Tolerance class B for external thread
Conventional ø 4”
DN 80 PN 16Flange Nominal Diameter: 80 mm th.
Nominal Pressure: 16 bar
Notes:
Conventional diameter value [in inches] identifi es short thread