Mitsubishi Electric CLIMAVENETA NECS-ME Series Service manual

Refrigerant gas R410A
Can be combined with a remote condenser
Integral control and adjustment
Integrated hydronic module
Condenserless chiller
NECS_ME_0152_1604_201004_GB
(The photo of the unit is indicative and may change depending on the model)
Climaveneta Technical Bulletin
0152 - 1604
39,5 - 432 kW
NECS-ME

Climaveneta S.p.A.:
Quality System complying with the requirements of UNI EN ISO9001:2008 regulation
Environmental Management System complying with the requirements of UNI EN
ISO14001:2004 regulation
CERTIFICATIONS
Product certifications
System certifications

II
NECS_ME_0152_1604_201004_GB
NECS-ME
HFC R410A
SUMMARY
NECS-ME
0152 - 1604
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 Office 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.
1. Product presentation
1.1 NECS-ME units
1.2 R410A refrigerant
1.3 Combination with a remote condenser
1.4 Integral control and adjustment
1.5 Hydronic unit incorporated
1.6 Silent running
1.7 Ease of installation
1.8 Versatility
1.9 Usability
2. Unit description
2.1 Standard unit composition
2.2 Certification, Reference standard
2.3 Tests
2.4 Controller
2.5 Accessories
2.6 Control unit with LCD display (standard)
3. Technical data
3.1 General technical data
3.2 Cooling capacity performance
4. Operating range
5. Hydraulic data
5.1 Water flow and pressure dro
5.2 Hydronic groups
6. Electrical data
7. Full load sound level
8. Dimensional drawings
9. Legend of pipe connections
10. Remote condensers
11. Combinations of evaporating units and remote condensers
pg. n° III
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The units highlighted in this publication contain HFC R410A [GWP100 2088] fluorinated greenhouse gases.

III
NECS_ME_0152_1604_201004_GB
NECS-ME
HFC R410A
1. PRODUCT PRESENTATION
Introduction
This section contains general information on the NECS-ME
range of products. For detailed information refer to the specific
sections in this bulletin.
1.1 NECS-ME units
The NECS-ME chillers are a range of remote-condensation liq-
uid units running on R410A ecological gas.
They are indoor units with hermetic scroll compressors in a
single-circuit (2-compressor units) and twin-circuit (4-compres-
sor unit) tandem configuration, and braze-welded plate heat
exchangers.
1.2 R410A refrigerant
The use of R410A has improved the energy efficiency of the
units, in full respect of the environment (O.D.P.=0)
1.3 Combination with a remote condenser
Compact units designed for residential and commercial sys-
tems.
1.4 Integral control and adjustment
The evaporating unit is supplied complete with integral micro-
processor control and optional connection to a remote con-
denser.
1.5 Hydronic unit incorporated
The integrated hydronic unit comprises the main hydraulic
components; it is available in various configurations with single
or dual orthogonal pumps and high or low heads.
1.6 Silent running
The NECS-ME chillers stand out for their silent running. If
specifically requested, the casing of the unit can incorporate
a layer of soundproofing made from high intermediate density
conoid sandwich material which reduces noise sufficiently to
allow NECS-ME to be used in residential and commercial ar-
eas without having to install it in dedicated rooms (technical
rooms). The benefit in terms of noise reduction is 4dB(A) in the
models with 2 compressors and 10dB(A) in the models with 4
compressors.
1.7 Ease of installation
All the connections of the NECS-ME units are located on the
side in order to simplify installation operations. This feature
also makes it possible to save space as the units can be posi-
tioned near the perimeter walls without compromising access
to the internal components during maintenance.
1.8 Versatility
On request, the NECS-ME units can be fitted with an inte-
grated pump unit for circulating the liquid in the system, with
a high or low head depending on the various application re-
quirements. As well as the primary pump, it is also possible to
add an auxiliary circulation pump which starts automatically if
the former develops a fault. This makes it possible to respect
the harshest safety aspects of the system, whilst allowing the
pumps to be rotated to balance operating hours (thus prevent-
ing risks of mechanical breakage) and to manually select one
of the two pumps.
1.9 Usability
The electronic controller of the NECS-ME features a program-
mable menu containing the most popular European languages
which the user can choose depending on the country in which
the unit is used (available standard in the 4-compressor unit, in
the reduced mode in the 2-compressor version).

1
NECS_ME_0152_1604_201004_GB
NECS-ME
HFC R410A
Liquid chiller with remote condensation
Water-cooled indoor unit for producing chilled water, with con-
nection to a remote condenser fitted with hermetic rotary scroll
compressorsrunningonR410A,braised-weldedplateexchang-
ers and a thermostatic expansion valve. Base and panelling in
hot-galvanised and painted sheet steel.
2.1 Standard unit composition
Structure
Base and frame in hot-galvanised shaped sheet steel with a
suitable thickness.
External panelling in PET-treated colaminate sheet, suitably
thick, built to allow total access to the internal components,
ventilation of the compressor chamber (standard for NECS-ME
0152..0612, option for all the other units). Acoustic insulation
of the panel with 30 mm thick Fiberform available as an acces-
sory. Panels fixed with metric screws (not self-tapping).
Refrigerant circuit
Main components of the refrigerant circuit:
- single-circuit unit with two compressors in a tandem configu-
ration (NECS-ME 0152..0612)
- twin-circuit unit with two compressors in a tandem configura-
tion on both circuits (NECS-ME 0612..1604)
- R410A refrigerant
- mechanical thermostatic valves
- dryer filter,
- refrigerant line sight glass with humidity indicator
- high pressure safety valve
- low pressure safety valve
- high and low pressure transducers
- high and low pressure gauges on all circuits (NECS-ME
0604..1604).
Compressor
Rotary hermetic scroll compressor in a tandem layout complete
with oil sump heater, electronic overheating protection with cen-
tralised manual reset and a two-pole electric motor.
User side exchanger
AISI 316 steel braze-welded plate exchanger. The heat ex-
changer is insulated with a closed-cell condensation proof
lining in neoprene. When the unit is working, it is protected
against lack of flow by a differential pressure switch mounted
on the water side. The unit can work with antifreeze mixtures at
exchanger outlet temperatures as low as -8°C.
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,
- fuses and contactors for compressors (NECS-ME
0604..1604)
- circuit breakers on loads (NECS-ME 0152..0612)
- numbered electric cables (NECS-ME 0152..0612)
- auxiliary signal 4..2OmA for unit operating setpoint offset
(NECS-ME 0604..1604)
- Keyboard with multi-language interface and LCD display
(NECS-ME 0604..1604)
- remote ON/OFF terminals
- spring terminals
- pump enable relays (only for units without a standard hydronic
unit)
- manual and automatic pump rotation system in case pumps
stop (only for units with a two-pump hydronic unit)
- automatic pump operation rotation system for balancing oper-
ating hours (only for units with a two-pump hydronic unit)
- terminals for cumulative alarm block (BCA)
- input voltage: 400V~ ±10% - 50Hz - 3N.
2.2 Certification, Reference standards
The machine complies with the following directives and their
amendments:
- 2006/42/EC Machinery Directive.
- E.C.D. 89/336/EEC + 2004/108/EC.
- 2006/95/EC Low Voltage Directive.
- 97/23/EC Pressure Equipment Directive. Module A1. TÜV-
Italia 0948
2.3 Tests
Tests performed throughout the production process, as indicat-
ed in ISO9001. Performance or noise tests can be performed
by highly qualified staff in the presence of customers.
Performance tests include the measurement of:
- electrical specifications
- water flow rates
- operating temperatures
- power input
- power output
- pressure drops on the water side exchanger both at full load
(at selection conditions and at the most critical conditions for
the condenser) and at part load conditions.
During performance testing the main alarm states can also be
simulated.
Noise tests are performed to check noise emissions according
to ISO3744.
2. UNIT DESCRIPTION