Lennox MWC 380, MWC 330, MWC 450, MWC 510, MWC 570 Application Manual

APPLICATION
GUIDE

Water cooled chillers
Heat pumps

MWC
MWR

180  720 kW

MCW-AGU-0410-E

lennoxemeia.com

TABLE OF CONTENTS

APPLICATION GUIDE

1.

GENERAL

Features and benefi ts
Options and accessories
Model number description

2.

GENERAL DATA

General data
Pressure drops
Hydraulic data
Acoustic data
Operating limits

Ref : MWC-AGU-0410-E

2
4
5

6
10
11
12
13

ELECTRICAL DATA

4.

Electrical tables

PERFORMANCES

5.

MWC - Cooling mode
MRC - Cooling mode
MWC - Heating mode

DIMENSIONAL DATA

6.

Dimensional data

14

15
16
17

18

Our company is member of the Eurovent certifi cation program.

The MWC™ Lennox chillers are tested and rated in accordance with Eurovent certifi cation program.

Our products comply with the European standards.

Product designed and manufactured under a quality management system certifi ed ISO 9001.

All the technical and technological information contained in this manual, including any drawing and technical descriptions provided
by us, remain the property of Lennox and must not be utilised (except in operation of this product), reproduced, issued to or made
available to third parties without the prior written agreement of Lennox.

Application Guide • MWC-0410-E • 1 •

FEATURES AND BENEFITS

Water cooled liquid chiller for indoor installation

GENERAL CHARACTERISTICS OF THE UNIT

The MWC unit is designed for industrial and commercial
applications where customers require reduced total cost of
ownership for new air conditioning equipment.

As main characteristics the MWC unit offers multi scroll
R410A compressors with two circuits for safety operation and
oversized heat exchangers for high full and part load energy
performances (Class B effi ciency / ESEER > 6.0).

The MWC is the solution for indoor installation. Thanks to
very compact dimensions and limited footprint MWC can be
installed easily into any technical room.

The MWC is available in 2 main versions to meet all customer
requirements and applications :

- MWC version is the water-cooled chiller. This version can
be used for air conditioning applications in association with
a separate dry-cooler or using ground water. The MWC ver­sion can also be used for heating applications. With the “hot
water set point control” option the MWC range can supply
hot water up to +50°C.

- MRC version is the split version without condenser. This
version can be used for air conditioning applications in as­sociation with a remote air-cooled condenser

COMPRESSOR

MWC is using R410A vibration-free compliant® scroll compressors
to guarantee a low operating sound level, a high durability and
reliability and no maintenance.

- Exclusive Compliant® Scroll design with both axial and radial
compliance to increase compressor operation tolerance to
liquid refrigerant, substantially improving durability and re­liability.

- Motor cooled by suction gas.

- Electronic control of the compressor discharge tempera­ture.

- Motor protection device against high temperature or over
current situations.

- Discharge non-return valve.

- Compressors assembly installed on an independent chassis
supported by anti-vibration mountings.

- Optional sound-proofed panel enclosures to reduce noise
emissions.

WATER HEAT EXCHANGER (EVAPORATOR
AND CONDENSER)

MWC is using stainless steel brazed plate heat exchangers with
true dual circuit.

REFRIGERANT CIRCUIT

MWC is using R410A refrigerant in 2 independent circuits that
allows operation at 50% of the capacity in case of issue on one
circuit.

Each circuit includes:

- A refrigerant charge reduced by 30% thanks to the use of
R410A combined with plate heat exchanger

- Suction piping with thermal insulation.

- Moisture sight glass on the MRC version

- Filter drier with removable cartridge fi lter.

- Thermostatic valve or electronic expansion valve (optional
from size 180 to 570, standard on size 650 & 720).

- Temperature sensors and pressure transducers.

- Leak-tight refrigerant circuit with brazing carried out under
nitrogen by certifi ed technicians.

- Each refrigerant circuit is pressure and leak tested with a
Hydrogen/Nitrogen mixture, and vacuumed before being
charged with refrigerant. All units are then subjected to a
complete functional and operational run test to guarantee
perfect sealing before leaving the factory.

- Copper brazed stainless steel plate heat exchanger.

- 13 mm closed cell thermal foam insulation.

- Evaporator protected against freezing risks thanks to an
electronic water fl ow switch

- Condenser protected against low condensing temperature
thanks to a 0-10 V output signal available from the controller
to control a condenser water inlet valve (Not from Lennox
supply).

CASING/CHASSIS

- Chassis made of galvanised steel sheet metal painted with
a RAL 7016 (grey) powdered polyester paint.

- Optional casing with removable panels made of galvanised
steel sheet metal painted with a RAL 7016 (grey) powdered
polyester paint.

• 2 • Application Guide • MWC-0410-E

FEATURES AND BENEFITS

ELECTRICAL BOX

The MWC is designed for 400V/3/50Hz supply.

- Unit electrical cabinet, components and wiring in compliance
with EN 60204-1 electrical directive.

- 400V/3/50Hz power supply (without neutral) with a single
point of power connection.

- IP24 protection class.

- Recognized brand electrical components for ease of main­tenance.

- Main on/off switch mounted on the front panel.

- DC50 user interface mounted on the front panel.

- 400/24 V transformer to supply the control circuit.

- Labelled electrical wires to facilitate maintenance and dia­gnostic.

- Optional power and control circuit for the pumps.

CONTROL

CLIMATIC™ microprocessor based control is providing the
following functions:

- 4 scheduling time zones per day over 7 days to allow energy
consumption management according to the building use and
environmental constraints.

- PI control of the water temperature with operating time
equalisation of the compressors.

- Intelligent advanced control algorithm to protect the compres­sors against excessive short-cycling and to allow operation
of the unit without buffer tank in most comfort air conditioning
applications (e.g. unit with fan-coils). Refer to minimum ins­tallation water loop volume recommendations.

- Water pump control with operating time equalization and
automatic change-over in case of a pump fault (Twin pump
only).

- Master/slave or cascade control of two chillers operating
in parallel with operating time equalization and automatic
change-over in case of a unit fault.

CLIMATIC™ is pre-factory confi gured with default settings
allowing a fast commissioning on site. The DC50™ user interface
with graphical display is easy to use, intuitive. Main customer
parameters can be read or modifi ed without main power shut-off
(Entering/leaving water temperatures, alarms, water set-points,
high and low pressure readings).
The DS50™ service display (optional) is a .plug and play"
controller that allows service people to read and modify all
unit parameters (Unit settings, operating time and number of
compressor starts, low and high pressure reading, read the
history of last 32 faults...).

COMMUNICATION

The control board is equipped with a RS485 serial communication
port to allow remote management through communication
bus.
According to the wished communication protocol, our control
board can be fi tted with ModBUS®, LonWorks® or BacNET®
communication interface (options).
The main control board has free dry contacts that allow remote
control of the unit by wired cable:

- Remote on/off of the unit.

- Remote alarm reset to re-start the unit.

- Alarm or alert indications.

- Free customer contact.

With the optional extension board BE50, it is possible to get
additional customized digital or analog inputs/outputs for remote
control of the unit:

- Fault pumps (dry contact).

- Operation indication at 100% on circuit 1 or 2 (dry
contact).

- Dual water set-point management (dry contact).

- Force heating or cooling mode (24V AC input).

- Power limitation by disabling circuit 1 or 2 (24V AC input).

- Force unoccupied mode (24V AC input).

- Water set-point offset based on a 4-20mA signal.

DIRECTIVES

The unit is built to meet European norms and standards &
Eurovent certiFIcation performance standards.

. DI 97/23/CE Pressure Equipment Directive.

. DI 98/37/CE Machinery Directive.

. DI 73/23/CE Low Voltage Directive.

. DI 89/336/CE Electro Magnetic Compatibility Directive

. EN 378-2 Safety and Environmental Directive.

. The European Restriction of the Use of Certain Hazardous-

Substances (RoHS).

Application Guide • MWC-0410-E • 3 •

OPTIONS AND ACCESSORIES

OPTIONS DESCRIPTION ADVANTAGES MODELS

Control/Power electrical equipment of
single evaporator pump

Control/Power electrical equipment of
dual evaporator pump

Control/Power electrical equipment of
single condenser pump

Control/Power electrical equipment of
dual condenser pump

Electronic expansion valve

Evaporator fi lter (supplied loose)

Unit equipped with electrical power
and control circuit for one single
speed pump

Unit equipped with electrical power
and control circuit for dual single
speed pumps.

Unit equipped with electrical power
and control circuit for one single
speed pump

Unit equipped with electrical power
and control circuit for dual single
speed pumps.

Unit equipped with an electronic
expansion valve for smooth operation
in every temperature conditions

1000 microns water fi lter delivered
with piping and Victaulic connections.

Quick start-up on job site.

Quick start-up on job site.

Quick start-up on job site.

Quick start-up on job site.

Allows applications with changing
temperature conditions.

This protection must be fi tted to
protect the evaporator from any
possible impurities.

MWC/MRC

180 ► 720

MWC/MRC

180 ► 720

MWC

180 ► 720

MWC

180 ► 720

MWC

180 ► 570

MWC/MRC

180 ►720

Condenser fi lter (supplied loose)

Evaporator fl ange connections
(supplied loose)

Condenser fl ange connections
(supplied loose)

Hot water set-point control (Heat
pump mode)

DC50™ remote comfort display
(supply loose)

DS50™ service display (supply
loose)

1000 microns water fi lter delivered
with piping and Victaulic connections.

Two connection sleeves with Victaulic
groove and fl ange on opposite side.

Two connection sleeves with Victaulic
groove and fl ange on opposite side

Unit equipped with insulated heat
exchanger and hot water sensor on
condenser side for heating purpose.

Customer display located at 600
meters maximum from the unit.

Plug and play display delivered with 1
meter cable and connector for quick
connection on Climatic controller.

This protection must be fi tted to
protect the condenser from any
possible impurities.

Allow easy connection with fl anges
on customer side.

Allow easy connection with fl anges
on customer side.

Allow heat pump operation.

Remote customer parameter reading
and modifi cation.

Display for service technicians only.

MWC

180 ►720

MWC/MRC

180 ►720

MWC

180 ► 720

MWC

180 ►720

MWC/MRC

180 ►720

MWC/MRC

180 ►720

Communication card using ModBus/

Modbus communication interface

LonWorks® communication interface

• 4 • Application Guide • MWC-0410-E

.

JBus protocol

Communication card using LonTalk®
protocol.

Communication interface with a
building management system.

Communication interface with a
building management system.

MWC/MRC

180 ►720

MWC/MRC

180 ►720

OPTIONS AND ACCESSORIES

OPTIONS DESCRIPTION ADVANTAGES MODELS

BACnet® communication interface

Adalink™ supervision (Customer
friendly web based supervision)

BE50™ extension board for
additional inputs/outputs

Anti-vibration mounts (supplied
loose)

Panel enclosure (compressors)

Communication card using Bacnet®
protocol.

Electronic board with RS485 cables,
RJ11 phone cable, Ethernet cable
and power supply cable.

Electronic extension board with
additional analog inputs (4), digital
inputs (4) and digital outputs (4). See
control manual.

Rubber anti-vibration mounts to be
mounted under the unit.

Unit equipped with removable panels
around the compressors to reduce
sound level.

Communication interface with a
building management system.

Remote supervision of the unit via an
intuitive web page.

Relay card for remote control and
alarm report using dry contacts, 24
Vac or 4-20 mA signals.

Reduction of the transmission of
vibration to the ground.

Reduction of the unit sound power
level.

MWC/MRC

180 ►720

MWC/MRC

180 ►720

MWC/MRC

180 ►720

MWC/MRC

180 ►720

MWC/MRC

180 ►720

MODEL NUMBER DESCRIPTION

EXAMPLE : MWC 200D

M

W

C

200

D

N

M

1

Medium

W = Water cooled
R = Remote condenser

C = Cooling mode

Cooling capacity in kW

Number of circuits :
D = 2 circuits

Non ducted

R410 A refrigerant

Revision number

M

Application Guide • MWC-0410-E • 5 •

400V/3/50 Hz

GENERAL DATA

COOLING ONLY

MWC

MWC™ 180 230 280 330 380

Cooling mode

Cooling capacity

Power input

Full load amps

EER 4,74 4,66 4,70 4,70 4,70

(2)

ESEER

Evaporator water fl ow

Evaporator pressure drop

Condenser water fl ow

Condenser pressure drop

Heating mode

Heating capacity

Power input

Full load amps

COP

Condenser water fl ow

Condenser pressure drop

Evaporator water fl ow

Evaporator pressure drop

Compressor Scroll - Hermetic

Number of compressor nr

Capacity steps

Oil charge per compressor

Oil type type MOBIL EAL Arctic 22CC or ICI EMKARATE RL32CF

Refrigerant

Expansion type Thermostatic expansion valve

Number of circuit nr

Charge per circuit

Condenser (Heating mode) AISI 316 stainless steel plate brazed with copper heat exchanger

Water volume

Water operating pressure

Hydraulic connections Victaulic

Water inlet/outlet Inches

Evaporator (Cooling mode) AISI 316 stainless steel plate brazed with copper heat exchanger

Water volume

Water operating pressure

Hydraulic connections Victaulic

Water inlet/outlet Inches

Acoustic

Global sound power level

Electrical data

Start-up intensity

Maximum current

Dimensions

Length

Width

Height

Footprint

Operating weight

Shipping weight

(1)

(1)

(1)

kW

186,1 232,8 280,7 333,6 380,4

kW 39,3 49,9 59,7 70,9 81,0

A 70,6 86,6 101,1 118,1 133,2

6,74 6,31 6,38 6,25 6,03

(1)

(1)

(1)

(1)

(3)

(3)

(3)

m3/h 32,0 40,1 48,3 57,4 65,4

kPa 34,9 28,9 40,7 31,5 40,2

m3/h 37,2 46,7 56,2 66,8 76,2

kPa 46,2 38,3 30,3 41,8 40,5

kW

196,5 246,4 296,9 351,9 401,7

kW 48,5 61,5 73,1 86,9 99,1

A 86,6 110,0 130,7 155,3 177,1

4,05 4,00 4,06 4,05 4,05

(3)

(3)

(3)

(3)

3

/h 33,8 42,4 51,1 60,5 69,1

m

kPa 38,6 32,1 25,4 34,8 33,7

m3/h 32,0 40,1 48,3 57,4 65,4

kPa 34,9 28,9 40,7 31,5 40,2

44444

%

l

20-50-75-

100%

(2 x 3,2)

+ (2 x 3,2)

21-43-62-83-

100%

(3,2+6,3)

+ (2 x 3,2)

21-36-53-71-

85-100%
(3,2+6,3)

+ (3,2+6,3)

15-46-61-87-

100%

(2 x 6,3)

+ (3,2+6,3)

25-50-75-

100%

(2 x 6,3)

+ (2 x 6,3)

R410A

22222

kg8 12141422

l 13 24 35 35 43

kPa 600 600 600 600 600

4" 4" 4" 4" 4"

l 13 24 24 35 35

kPa 600 600 600 600 600

4" 4" 4" 4" 4"

(1)

dB(A) 81 87 89 90 92

400V / III / 50 Hz

A 266,9 402,9 431,7 460,1 488,3

A 123,8 152,2 181,0 209,4 237,6

mm 2150 2150 2150 2150 2150

mm 820 820 820 820 820

mm 1645 1870 1870 1870 1870

m² 1,8 1,8 1,8 1,8 1,8

kg 756 974 1158 1328 1534

kg 736 914 1088 1248 1444

All data are at Eurovent conditions :
(1) Gross cooling capacity with 12/7°C evaporator water temperature and

30/35°C condenser water temperature.

(*) Except for MWC 720 :13/7°C evaporator water temperature.

(2) ESEER according to EN14511 Eurovent calculation method.

(3) Gross heating capacity with 40/45°C condenser water temperature and 10°C

evaporator water inlet, with the same evaporator water fl ow as in cooling
mode.

OPERATING LIMITS on page 13

• 6 • Application Guide • MWC-0410-E